import { and, desc, eq, gte, inArray, isNull, lt, lte, ne, sql, exists } from 'drizzle-orm';

import { db } from '@/lib/db';
import {
  documents,
  documentSigners,
  documentEvents,
  documentWatchers,
  files,
} from '@/lib/db/schema/documents';
import { interests, interestBerths } from '@/lib/db/schema/interests';
import { clients } from '@/lib/db/schema/clients';
import { companies } from '@/lib/db/schema/companies';
import { yachts } from '@/lib/db/schema/yachts';
import { berthReservations } from '@/lib/db/schema/reservations';
import { ports } from '@/lib/db/schema/ports';
import { userProfiles, userPortRoles } from '@/lib/db/schema/users';
import { buildListQuery } from '@/lib/db/query-builder';
import { createAuditLog, type AuditMeta } from '@/lib/audit';
import { diffEntity } from '@/lib/entity-diff';
import { CodedError, NotFoundError, ValidationError, ConflictError } from '@/lib/errors';
import { emitToRoom } from '@/lib/socket/server';
import { buildStoragePath } from '@/lib/minio';
import { getStorageBackend } from '@/lib/storage';
import { env } from '@/lib/env';
import { logger } from '@/lib/logger';
import { evaluateRule } from '@/lib/services/berth-rules-engine';
import { PIPELINE_STAGES } from '@/lib/constants';
import { advanceStageIfBehind } from '@/lib/services/interests.service';
import {
  createDocument as documensoCreate,
  sendDocument as documensoSend,
  downloadSignedPdf,
  voidDocument as documensoVoid,
} from '@/lib/services/documenso-client';
import { getPortEoiSigners } from '@/lib/services/documenso-payload';
import { getPortDocumensoConfig } from '@/lib/services/port-config';
import {
  listTree,
  collectDescendantIds,
  ensureEntityFolder,
  type FolderNode,
  type EntityType,
} from '@/lib/services/document-folders.service';
import { assertEntityInPort, collectRelatedEntities } from '@/lib/services/files';
import type {
  CreateDocumentInput,
  UpdateDocumentInput,
  ListDocumentsInput,
} from '@/lib/validators/documents';

// ─── Types ────────────────────────────────────────────────────────────────────

// ─── List ─────────────────────────────────────────────────────────────────────

import { documentWatchers as documentWatchersTable } from '@/lib/db/schema/documents';

const NON_SIGNATURE_TYPES = [
  'welcome_letter',
  'handover_checklist',
  'acknowledgment',
  'correspondence',
];

function buildHubTabFilters(
  tab: ListDocumentsInput['tab'],
  currentUserEmail: string | undefined,
): ReturnType<typeof and>[] {
  const filters: ReturnType<typeof and>[] = [];
  if (!tab || tab === 'all') return filters;

  switch (tab) {
    case 'in_progress':
      // All document types currently in-flight — the everyday "what's in flight" view.
      filters.push(
        inArray(documents.status, ['draft', 'sent', 'partially_signed']),
        sql`${documents.status} != 'expired'`,
      );
      break;
    case 'eoi_queue':
      // EOI documents currently in-flight (drafted, sent, or partially signed).
      // Used by the dedicated tab on the documents hub to triage EOI signing
      // pipeline volume separate from the all-doc-types view.
      filters.push(eq(documents.documentType, 'eoi'));
      filters.push(inArray(documents.status, ['draft', 'sent', 'partially_signed']));
      break;
    case 'awaiting_them':
      // "awaiting them" = pending signers other than the current user.
      // Without a known caller email we cannot make that distinction, so
      // short-circuit to empty rather than silently widen the result set.
      if (!currentUserEmail) {
        filters.push(sql`1 = 0`);
        break;
      }
      filters.push(inArray(documents.status, ['sent', 'partially_signed']));
      filters.push(
        exists(
          db
            .select({ x: sql`1` })
            .from(documentSigners)
            .where(
              and(
                eq(documentSigners.documentId, documents.id),
                eq(documentSigners.status, 'pending'),
                ne(documentSigners.signerEmail, currentUserEmail),
              ),
            ),
        ),
      );
      break;
    case 'awaiting_me':
      if (!currentUserEmail) {
        // Without a current-user email there is no concept of "awaiting me"
        filters.push(sql`1 = 0`);
        break;
      }
      filters.push(
        exists(
          db
            .select({ x: sql`1` })
            .from(documentSigners)
            .where(
              and(
                eq(documentSigners.documentId, documents.id),
                eq(documentSigners.status, 'pending'),
                eq(documentSigners.signerEmail, currentUserEmail),
              ),
            ),
        ),
      );
      break;
    case 'completed':
      filters.push(inArray(documents.status, ['completed', 'signed']));
      break;
    case 'expired':
      // Either explicitly expired, or in-flight past their expiry date.
      // (Documents schema doesn't yet have an `expires_at` column, so for
      // now this is just status='expired' - extend when expiry lands.)
      filters.push(eq(documents.status, 'expired'));
      break;
  }
  return filters;
}

export interface ListDocumentsExtra {
  /** Email of the calling user - used by hub tab filtering for "awaiting me". */
  currentUserEmail?: string;
}

export async function listDocuments(
  portId: string,
  query: ListDocumentsInput,
  extra: ListDocumentsExtra = {},
) {
  const {
    page,
    limit,
    sort,
    order,
    search,
    interestId,
    clientId,
    documentType,
    status,
    tab,
    watcherUserId,
    signatureOnly,
    sentSince,
    sentUntil,
  } = query;

  const filters: ReturnType<typeof and>[] = [];

  if (interestId) filters.push(eq(documents.interestId, interestId));
  if (clientId) filters.push(eq(documents.clientId, clientId));
  if (documentType) filters.push(eq(documents.documentType, documentType));
  if (status) filters.push(eq(documents.status, status));
  if (query.folderId !== undefined) {
    if (query.folderId === null) {
      filters.push(isNull(documents.folderId));
    } else if (query.includeDescendants) {
      const tree = await listTree(portId);
      const descendantIds = collectDescendantIds(tree, query.folderId);
      filters.push(inArray(documents.folderId, [query.folderId, ...descendantIds]));
    } else {
      filters.push(eq(documents.folderId, query.folderId));
    }
    // When viewing a specific folder, hide completed workflows — they surface
    // via their resulting signed-PDF file row in the Files section, not the
    // Signing section.
    filters.push(ne(documents.status, 'completed'));
  }
  if (sentSince) filters.push(gte(documents.createdAt, new Date(sentSince)));
  if (sentUntil) filters.push(lte(documents.createdAt, new Date(sentUntil)));
  if (signatureOnly === true) {
    filters.push(
      sql`${documents.documentType} NOT IN ('welcome_letter','handover_checklist','acknowledgment','correspondence')`,
    );
  } else if (signatureOnly === false) {
    // Pass-through, no extra filter needed.
  }
  if (watcherUserId) {
    filters.push(
      exists(
        db
          .select({ x: sql`1` })
          .from(documentWatchersTable)
          .where(
            and(
              eq(documentWatchersTable.documentId, documents.id),
              eq(documentWatchersTable.userId, watcherUserId),
            ),
          ),
      ),
    );
  }

  filters.push(...buildHubTabFilters(tab, extra.currentUserEmail));

  void NON_SIGNATURE_TYPES;
  void lt;

  const sortColumn =
    sort === 'title'
      ? documents.title
      : sort === 'status'
        ? documents.status
        : sort === 'documentType'
          ? documents.documentType
          : documents.createdAt;

  const result = await buildListQuery<typeof documents.$inferSelect>({
    table: documents,
    portIdColumn: documents.portId,
    portId,
    idColumn: documents.id,
    updatedAtColumn: documents.updatedAt,
    searchColumns: [documents.title],
    searchTerm: search,
    filters: filters.filter(Boolean) as Parameters<typeof buildListQuery>[0]['filters'],
    sort: sort ? { column: sortColumn, direction: order } : undefined,
    page,
    pageSize: limit,
  });

  const hydrated = await hydrateDocumentsWithDownloadUrl(portId, result.data);
  return { ...result, data: hydrated };
}

// ─── Download URL helpers ─────────────────────────────────────────────────────

/**
 * Resolve the rep-facing download URL for a document. The URL embeds the
 * folder path + filename for browser-tab / shared-link readability, but the
 * route handler keys lookup off the doc id and validates the slug for truth
 * — a hand-edited URL with the wrong path 404s instead of silently serving
 * the wrong file.
 *
 * Pass the resolved folder tree once per request and call this for each doc
 * so we don't refetch the tree per row. Returns `null` when the document has
 * no attached file (signature-only docs pre-completion); UI consumers branch
 * on that to decide whether to render the download affordance.
 */
export function buildDocumentDownloadUrl(
  doc: { id: string; folderId: string | null; filename: string | null },
  folderTree: readonly FolderNode[],
): string | null {
  if (!doc.filename) return null;
  const segments: string[] = [];
  if (doc.folderId) {
    const path = findFolderPath(folderTree, doc.folderId);
    for (const node of path) segments.push(encodeURIComponent(node.name));
  }
  segments.push(encodeURIComponent(doc.filename));
  return `/api/v1/documents/${doc.id}/download/${segments.join('/')}`;
}

/**
 * Walk the folder tree to materialize the ancestor chain that ends at
 * `id`. Returns roots-first; empty when the id is missing (orphan
 * `folder_id` pointer — see listTree's intentional silent drop).
 */
export function findFolderPath(tree: readonly FolderNode[], id: string): FolderNode[] {
  for (const node of tree) {
    if (node.id === id) return [node];
    const inChild = findFolderPath(node.children, id);
    if (inChild.length > 0) return [node, ...inChild];
  }
  return [];
}

type DocumentRow = typeof documents.$inferSelect;
type DocumentRowWithDownload = DocumentRow & { downloadUrl: string | null };

async function hydrateDocumentsWithDownloadUrl(
  portId: string,
  rows: DocumentRow[],
): Promise<DocumentRowWithDownload[]> {
  if (rows.length === 0) return [];

  const fileIds = Array.from(
    new Set(rows.map((r) => r.fileId).filter((v): v is string => v !== null)),
  );
  const filenameById = new Map<string, string | null>();
  if (fileIds.length > 0) {
    const fileRows = await db
      .select({ id: files.id, filename: files.filename })
      .from(files)
      .where(and(inArray(files.id, fileIds), eq(files.portId, portId)));
    for (const f of fileRows) filenameById.set(f.id, f.filename);
  }

  const tree = await listTree(portId);
  return rows.map((row) => {
    const filename = row.fileId ? (filenameById.get(row.fileId) ?? null) : null;
    return {
      ...row,
      downloadUrl: buildDocumentDownloadUrl({ id: row.id, folderId: row.folderId, filename }, tree),
    };
  });
}

// ─── Deal docs for a berth ────────────────────────────────────────────────────

export interface BerthDealDoc {
  id: string;
  title: string;
  documentType: string;
  status: string;
  createdAt: Date;
  interestId: string;
}

/**
 * Documents attached to any interest currently linked to this berth via
 * `interest_berths`. Used by the Deal Documents tab on the berth detail
 * page so reps can see EOIs / contracts / etc. associated with active
 * prospects on this slip without leaving the page.
 *
 * Read-only; visibility piggybacks on the interest tenancy (the
 * permission-gate on the berth page guards entry, and we only return
 * documents for interests in the same port). Edits / sends still happen
 * from the interest's own page.
 */
export async function listDealDocumentsForBerth(
  portId: string,
  berthId: string,
): Promise<BerthDealDoc[]> {
  const rows = await db
    .select({
      id: documents.id,
      title: documents.title,
      documentType: documents.documentType,
      status: documents.status,
      createdAt: documents.createdAt,
      interestId: documents.interestId,
    })
    .from(documents)
    .innerJoin(interestBerths, eq(interestBerths.interestId, documents.interestId))
    .innerJoin(interests, eq(interests.id, documents.interestId))
    .where(
      and(
        eq(interestBerths.berthId, berthId),
        eq(documents.portId, portId),
        eq(interests.portId, portId),
      ),
    )
    .orderBy(sql`${documents.createdAt} DESC`);

  return rows
    .filter((r): r is typeof r & { interestId: string } => Boolean(r.interestId))
    .map((r) => ({
      id: r.id,
      title: r.title,
      documentType: r.documentType,
      status: r.status,
      createdAt: r.createdAt,
      interestId: r.interestId,
    }));
}

// ─── Get by ID ────────────────────────────────────────────────────────────────

export async function getDocumentById(id: string, portId: string) {
  const doc = await db.query.documents.findFirst({
    where: and(eq(documents.id, id), eq(documents.portId, portId)),
    with: { signers: true },
  });

  if (!doc) throw new NotFoundError('Document');

  let filename: string | null = null;
  if (doc.fileId) {
    const fileRow = await db
      .select({ filename: files.filename })
      .from(files)
      .where(and(eq(files.id, doc.fileId), eq(files.portId, portId)))
      .limit(1)
      .then((r) => r[0]);
    filename = fileRow?.filename ?? null;
  }
  const tree = await listTree(portId);
  const downloadUrl = buildDocumentDownloadUrl(
    { id: doc.id, folderId: doc.folderId, filename },
    tree,
  );
  return { ...doc, downloadUrl };
}

/**
 * Reject any subject FK (clientId / interestId / companyId / yachtId /
 * reservationId) that points at a row outside the caller's port. Without
 * this guard, a port-A user could create a document whose subject is a
 * port-B client and then exfiltrate the foreign client's name + email
 * via sendForSigning's Documenso payload, or via the local watcher /
 * notification surfaces that hydrate the linked entity.
 */
async function assertSubjectFksInPort(
  portId: string,
  fks: {
    clientId?: string | null;
    interestId?: string | null;
    companyId?: string | null;
    yachtId?: string | null;
    reservationId?: string | null;
  },
): Promise<void> {
  const checks: Array<Promise<void>> = [];
  if (fks.clientId) {
    checks.push(
      db.query.clients
        .findFirst({ where: and(eq(clients.id, fks.clientId), eq(clients.portId, portId)) })
        .then((row) => {
          if (!row) throw new ValidationError('clientId not found in this port');
        }),
    );
  }
  if (fks.interestId) {
    checks.push(
      db.query.interests
        .findFirst({
          where: and(eq(interests.id, fks.interestId), eq(interests.portId, portId)),
        })
        .then((row) => {
          if (!row) throw new ValidationError('interestId not found in this port');
        }),
    );
  }
  if (fks.companyId) {
    checks.push(
      db.query.companies
        .findFirst({
          where: and(eq(companies.id, fks.companyId), eq(companies.portId, portId)),
        })
        .then((row) => {
          if (!row) throw new ValidationError('companyId not found in this port');
        }),
    );
  }
  if (fks.yachtId) {
    checks.push(
      db.query.yachts
        .findFirst({ where: and(eq(yachts.id, fks.yachtId), eq(yachts.portId, portId)) })
        .then((row) => {
          if (!row) throw new ValidationError('yachtId not found in this port');
        }),
    );
  }
  if (fks.reservationId) {
    checks.push(
      db.query.berthReservations
        .findFirst({
          where: and(
            eq(berthReservations.id, fks.reservationId),
            eq(berthReservations.portId, portId),
          ),
        })
        .then((row) => {
          if (!row) throw new ValidationError('reservationId not found in this port');
        }),
    );
  }
  await Promise.all(checks);
}

/**
 * Reject watchers whose user does not have access to the document's port.
 * Without this guard, a document watcher row could be created for a user
 * outside the document's tenant; subsequent notifyDocumentEvent emits a
 * socket toast + email to that user revealing the document's title.
 * Super-admins are always allowed (they can watch anything).
 */
async function assertWatchersInPort(portId: string, userIds: string[]): Promise<void> {
  if (userIds.length === 0) return;
  const unique = [...new Set(userIds)];
  // Super-admins bypass the port check.
  const profiles = await db.query.userProfiles.findMany({
    where: inArray(userProfiles.userId, unique),
  });
  const superAdmins = new Set(profiles.filter((p) => p.isSuperAdmin).map((p) => p.userId));
  const needsCheck = unique.filter((u) => !superAdmins.has(u));
  if (needsCheck.length === 0) return;
  const roles = await db
    .select({ userId: userPortRoles.userId })
    .from(userPortRoles)
    .where(and(inArray(userPortRoles.userId, needsCheck), eq(userPortRoles.portId, portId)));
  const allowed = new Set(roles.map((r) => r.userId));
  const denied = needsCheck.filter((u) => !allowed.has(u));
  if (denied.length > 0) {
    throw new ValidationError('One or more watchers do not have access to this port');
  }
}

// ─── Create ───────────────────────────────────────────────────────────────────

export async function createDocument(portId: string, data: CreateDocumentInput, meta: AuditMeta) {
  await assertSubjectFksInPort(portId, {
    clientId: data.clientId,
    interestId: data.interestId,
  });

  const [doc] = await db
    .insert(documents)
    .values({
      portId,
      interestId: data.interestId ?? null,
      clientId: data.clientId ?? null,
      folderId: data.folderId ?? null,
      documentType: data.documentType,
      title: data.title,
      notes: data.notes ?? null,
      status: 'draft',
      createdBy: meta.userId,
    })
    .returning();

  void createAuditLog({
    userId: meta.userId,
    portId,
    action: 'create',
    entityType: 'document',
    entityId: doc!.id,
    newValue: { documentType: doc!.documentType, title: doc!.title },
    ipAddress: meta.ipAddress,
    userAgent: meta.userAgent,
  });

  emitToRoom(`port:${portId}`, 'document:created', { documentId: doc!.id });

  return doc!;
}

// ─── Update ───────────────────────────────────────────────────────────────────

export async function updateDocument(
  id: string,
  portId: string,
  data: UpdateDocumentInput,
  meta: AuditMeta,
) {
  const existing = await getDocumentById(id, portId);

  const updates: Partial<typeof documents.$inferInsert> = {};
  if (data.title !== undefined) updates.title = data.title;
  if (data.notes !== undefined) updates.notes = data.notes;
  if (data.status !== undefined) updates.status = data.status;
  updates.updatedAt = new Date();

  const [updated] = await db
    .update(documents)
    .set(updates)
    .where(and(eq(documents.id, id), eq(documents.portId, portId)))
    .returning();

  diffEntity(existing, updated!);

  void createAuditLog({
    userId: meta.userId,
    portId,
    action: 'update',
    entityType: 'document',
    entityId: id,
    oldValue: existing as unknown as Record<string, unknown>,
    newValue: updated as unknown as Record<string, unknown>,
    ipAddress: meta.ipAddress,
    userAgent: meta.userAgent,
  });

  emitToRoom(`port:${portId}`, 'document:updated', { documentId: id });

  return updated!;
}

// ─── Delete ───────────────────────────────────────────────────────────────────

export async function deleteDocument(id: string, portId: string, meta: AuditMeta) {
  const existing = await getDocumentById(id, portId);

  if (['sent', 'partially_signed'].includes(existing.status)) {
    throw new ConflictError('Cannot delete a document that is currently in signing process');
  }

  await db.delete(documents).where(and(eq(documents.id, id), eq(documents.portId, portId)));

  void createAuditLog({
    userId: meta.userId,
    portId,
    action: 'delete',
    entityType: 'document',
    entityId: id,
    oldValue: { title: existing.title, status: existing.status },
    ipAddress: meta.ipAddress,
    userAgent: meta.userAgent,
  });

  emitToRoom(`port:${portId}`, 'document:deleted', { documentId: id });
}

// ─── Send for Signing (BR-021) ────────────────────────────────────────────────

export async function sendForSigning(documentId: string, portId: string, meta: AuditMeta) {
  const doc = await getDocumentById(documentId, portId);
  if (!doc.fileId) throw new ValidationError('Document has no associated file');
  if (doc.status !== 'draft') throw new ConflictError('Document is not in draft status');

  // Fetch interest + client to build signers. Filter by portId in addition
  // to the FK so that even if a stale or maliciously-set subject FK on the
  // document points at a foreign-port row, this signing flow refuses to
  // hydrate (and therefore refuses to ship to Documenso) data from outside
  // the caller's tenant.
  const interest = doc.interestId
    ? await db.query.interests.findFirst({
        where: and(eq(interests.id, doc.interestId), eq(interests.portId, portId)),
      })
    : null;

  const client = doc.clientId
    ? await db.query.clients.findFirst({
        where: and(eq(clients.id, doc.clientId), eq(clients.portId, portId)),
        with: { contacts: true },
      })
    : null;

  if (!client) throw new ValidationError('Document has no associated client');

  const emailContact = (
    client.contacts as Array<{ channel: string; value: string }> | undefined
  )?.find((c) => c.channel === 'email');
  if (!emailContact?.value) throw new ValidationError('Client has no email contact');

  const port = await db.query.ports.findFirst({ where: eq(ports.id, portId) });
  if (!port) throw new NotFoundError('Port');

  // Resolve port-configured signer emails from system settings; fall back to
  // legacy defaults only if the setting is absent. Fabricated slug-based
  // addresses (developer@{slug}.com) are no longer used here because they
  // never match real port users and cause silent no-ops in handleRecipientSigned.
  const eoiSigners = await getPortEoiSigners(portId);

  // BR-021: Create 3 signers - client (1), developer (2), sales/approver (3)
  const signerRecords = await db
    .insert(documentSigners)
    .values([
      {
        documentId,
        signerName: client.fullName,
        signerEmail: emailContact.value,
        signerRole: 'client',
        signingOrder: 1,
        status: 'pending',
      },
      {
        documentId,
        signerName: eoiSigners.developer.name,
        signerEmail: eoiSigners.developer.email,
        signerRole: 'developer',
        signingOrder: 2,
        status: 'pending',
      },
      {
        documentId,
        signerName: eoiSigners.approver.name,
        signerEmail: eoiSigners.approver.email,
        signerRole: 'approver',
        signingOrder: 3,
        status: 'pending',
      },
    ])
    .returning();

  // Get file from MinIO and base64 encode
  const fileRecord = await db.query.files.findFirst({ where: eq(files.id, doc.fileId) });
  if (!fileRecord) throw new NotFoundError('File');

  const fileStream = await (await getStorageBackend()).get(fileRecord.storagePath);
  const chunks: Buffer[] = [];
  for await (const chunk of fileStream) {
    chunks.push(Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk));
  }
  const pdfBuffer = Buffer.concat(chunks);
  const pdfBase64 = pdfBuffer.toString('base64');

  // Read per-port v2 signing settings (PARALLEL/SEQUENTIAL + redirect URL).
  // Both are optional — passing undefined yields v1's legacy behavior.
  const docCfg = await getPortDocumensoConfig(portId);

  // Create document in Documenso + send. portId is required for the v2
  // envelope/create code path (which routes by per-port apiVersion);
  // meta.signingOrder is honoured only on v2 instances.
  const documensoDoc = await documensoCreate(
    doc.title,
    pdfBase64,
    [
      { name: client.fullName, email: emailContact.value, role: 'SIGNER', signingOrder: 1 },
      {
        name: eoiSigners.developer.name,
        email: eoiSigners.developer.email,
        role: 'SIGNER',
        signingOrder: 2,
      },
      {
        name: eoiSigners.approver.name,
        email: eoiSigners.approver.email,
        role: 'SIGNER',
        signingOrder: 3,
      },
    ],
    portId,
    {
      ...(docCfg.signingOrder ? { signingOrder: docCfg.signingOrder } : {}),
      ...(docCfg.redirectUrl ? { redirectUrl: docCfg.redirectUrl } : {}),
    },
  );

  await documensoSend(documensoDoc.id, portId);

  // Update signer records with signing URLs from Documenso response
  for (const docSigner of documensoDoc.recipients) {
    const localSigner = signerRecords.find((s) => s.signerEmail === docSigner.email);
    if (localSigner) {
      await db
        .update(documentSigners)
        .set({
          signingUrl: docSigner.signingUrl ?? null,
          embeddedUrl: docSigner.embeddedUrl ?? null,
        })
        .where(eq(documentSigners.id, localSigner.id));
    }
  }

  // Update document status
  await db
    .update(documents)
    .set({ status: 'sent', documensoId: documensoDoc.id, updatedAt: new Date() })
    .where(eq(documents.id, documentId));

  // Update interest if linked
  if (interest) {
    await db
      .update(interests)
      .set({
        documensoId: documensoDoc.id,
        dateEoiSent: new Date(),
        eoiStatus: 'waiting_for_signatures',
        updatedAt: new Date(),
      })
      .where(eq(interests.id, interest.id));

    // Trigger berth rules
    void evaluateRule('eoi_sent', interest.id, portId, meta);

    // Advance pipeline stage to eoi_sent (no-op if already further along).
    void advanceStageIfBehind(interest.id, portId, 'eoi_sent', meta, 'EOI sent for signing');

    // G-C5: reservation agreements drive the contract_sent stage. The EOI
    // and contract flows share `sendForSigning`, so we differentiate by
    // documentType here rather than splitting the entry point.
    if (doc.documentType === 'reservation_agreement') {
      void advanceStageIfBehind(
        interest.id,
        portId,
        'contract_sent',
        meta,
        'Reservation agreement sent',
      );
    }
  }

  // Create document event
  await db.insert(documentEvents).values({
    documentId,
    eventType: 'sent',
    eventData: { documensoId: documensoDoc.id },
  });

  void createAuditLog({
    userId: meta.userId,
    portId,
    action: 'update',
    entityType: 'document',
    entityId: documentId,
    newValue: { status: 'sent', documensoId: documensoDoc.id },
    ipAddress: meta.ipAddress,
    userAgent: meta.userAgent,
  });

  emitToRoom(`port:${portId}`, 'document:sent', {
    documentId,
    type: doc.documentType,
    signerCount: 3,
    documensoId: documensoDoc.id,
  });

  return await getDocumentById(documentId, portId);
}

// ─── Upload Signed Manually (BR-013) ─────────────────────────────────────────

export async function uploadSignedManually(
  documentId: string,
  portId: string,
  fileData: { buffer: Buffer; originalName: string; mimeType: string; size: number },
  meta: AuditMeta,
) {
  const doc = await getDocumentById(documentId, portId);
  const port = await db.query.ports.findFirst({ where: eq(ports.id, portId) });
  if (!port) throw new NotFoundError('Port');

  // Store the signed file
  const fileId = crypto.randomUUID();
  const storagePath = buildStoragePath(port.slug, 'eoi-signed', documentId, fileId, 'pdf');

  await (
    await getStorageBackend()
  ).put(storagePath, fileData.buffer, {
    contentType: fileData.mimeType,
    sizeBytes: fileData.size,
  });

  const [fileRecord] = await db
    .insert(files)
    .values({
      portId,
      clientId: doc.clientId ?? null,
      filename: fileData.originalName,
      originalName: fileData.originalName,
      mimeType: fileData.mimeType,
      sizeBytes: String(fileData.size),
      storagePath,
      storageBucket: env.MINIO_BUCKET,
      category: 'eoi',
      uploadedBy: meta.userId,
    })
    .returning();

  // Update document
  await db
    .update(documents)
    .set({
      signedFileId: fileRecord!.id,
      status: 'completed',
      isManualUpload: true,
      updatedAt: new Date(),
    })
    .where(eq(documents.id, documentId));

  // Update interest if linked and type is eoi
  if (doc.interestId && doc.documentType === 'eoi') {
    const interest = await db.query.interests.findFirst({
      where: eq(interests.id, doc.interestId),
    });

    await db
      .update(interests)
      .set({ eoiStatus: 'signed', dateEoiSigned: new Date(), updatedAt: new Date() })
      .where(eq(interests.id, doc.interestId));

    if (interest) {
      void evaluateRule('eoi_signed', doc.interestId, portId, meta);

      // Advance to eoi_signed (no-op if already past it).
      void advanceStageIfBehind(
        doc.interestId,
        portId,
        'eoi_signed',
        meta,
        'Signed EOI uploaded manually',
      );
    }
  }

  await db.insert(documentEvents).values({
    documentId,
    eventType: 'completed',
    eventData: { isManualUpload: true, fileId: fileRecord!.id },
  });

  void createAuditLog({
    userId: meta.userId,
    portId,
    action: 'update',
    entityType: 'document',
    entityId: documentId,
    newValue: { status: 'completed', isManualUpload: true },
    ipAddress: meta.ipAddress,
    userAgent: meta.userAgent,
  });

  emitToRoom(`port:${portId}`, 'document:completed', { documentId });

  // Notify creator about manual completion
  void import('@/lib/services/notifications.service').then(({ createNotification }) =>
    createNotification({
      portId,
      userId: meta.userId,
      type: 'document_signed',
      title: 'Document marked as signed',
      description: `"${doc.title}" has been manually uploaded as signed`,
      link: `/documents/${documentId}`,
      entityType: 'document',
      entityId: documentId,
      dedupeKey: `document:${documentId}:completed`,
    }),
  );

  return await getDocumentById(documentId, portId);
}

// ─── List Signers ─────────────────────────────────────────────────────────────

export async function listDocumentSigners(documentId: string, portId: string) {
  await getDocumentById(documentId, portId); // verify access

  return db.query.documentSigners.findMany({
    where: eq(documentSigners.documentId, documentId),
    orderBy: (ds, { asc }) => [asc(ds.signingOrder)],
  });
}

// ─── List Events ──────────────────────────────────────────────────────────────

export async function listDocumentEvents(documentId: string, portId: string) {
  await getDocumentById(documentId, portId); // verify access

  return db.query.documentEvents.findMany({
    where: eq(documentEvents.documentId, documentId),
    orderBy: (de, { desc }) => [desc(de.createdAt)],
  });
}

// ─── Webhook Handlers ─────────────────────────────────────────────────────────

/**
 * Shared port-scoped lookup for inbound Documenso webhooks. Two ports
 * sharing a Documenso instance — or migrating between instances with
 * documentId reuse — would otherwise let `findFirst` return whichever
 * row sorts first across tenants. When the route resolves a portId from
 * the matched per-port webhook secret it threads it here; otherwise we
 * fall back to a port-agnostic `findMany` and refuse to mutate when the
 * lookup is ambiguous (mirrors the guard in handleDocumentExpired).
 *
 * Returns null when no document matches OR when the lookup is ambiguous
 * across multiple ports without a resolved portId. Callers must treat
 * null as "drop the event" (the cron sweep / next webhook will catch up
 * once the data is consistent).
 */
async function resolveWebhookDocument(
  documensoId: string,
  portId: string | undefined,
): Promise<typeof documents.$inferSelect | null> {
  if (portId) {
    const doc = await db.query.documents.findFirst({
      where: and(eq(documents.documensoId, documensoId), eq(documents.portId, portId)),
    });
    if (!doc) {
      logger.warn({ documensoId, portId }, 'Document not found for webhook (port-scoped)');
      return null;
    }
    return doc;
  }
  const matches = await db.query.documents.findMany({
    where: eq(documents.documensoId, documensoId),
  });
  if (matches.length === 0) {
    logger.warn({ documensoId }, 'Document not found for webhook');
    return null;
  }
  if (matches.length > 1) {
    logger.error(
      { documensoId, matchCount: matches.length, ports: matches.map((m) => m.portId) },
      'Documenso webhook ambiguous across multiple ports — refusing to mutate',
    );
    return null;
  }
  return matches[0]!;
}

export async function handleRecipientSigned(eventData: {
  documentId: string;
  recipientEmail: string;
  signatureHash?: string;
  portId?: string;
}) {
  const doc = await resolveWebhookDocument(eventData.documentId, eventData.portId);
  if (!doc) return;

  // Update signer status
  const [signer] = await db
    .update(documentSigners)
    .set({ status: 'signed', signedAt: new Date() })
    .where(
      and(
        eq(documentSigners.documentId, doc.id),
        eq(documentSigners.signerEmail, eventData.recipientEmail),
      ),
    )
    .returning();

  if (!signer) {
    // Email mismatch: the address Documenso has on the recipient doesn't match
    // any row in documentSigners. This happens when the local signers were
    // created with fabricated / stale addresses. Log a warning so operators can
    // investigate and fix the port's eoi_signers system setting.
    logger.warn(
      {
        documensoId: eventData.documentId,
        documentId: doc.id,
        recipientEmail: eventData.recipientEmail,
      },
      'handleRecipientSigned: no matching signer row for recipient email - ' +
        'check eoi_signers system setting for this port',
    );
  }

  // Update document to partially_signed if eoi type
  if (doc.documentType === 'eoi' && doc.status === 'sent') {
    await db
      .update(documents)
      .set({ status: 'partially_signed', updatedAt: new Date() })
      .where(and(eq(documents.id, doc.id), eq(documents.portId, doc.portId)));
  }

  await db.insert(documentEvents).values({
    documentId: doc.id,
    eventType: 'signed',
    signerId: signer?.id ?? null,
    signatureHash: eventData.signatureHash ?? null,
    eventData: { recipientEmail: eventData.recipientEmail },
  });

  emitToRoom(`port:${doc.portId}`, 'document:signer:signed', {
    documentId: doc.id,
    signerEmail: eventData.recipientEmail,
  });
}

// ─── Owner-wins resolution ────────────────────────────────────────────────────

interface ResolvedOwner {
  entityType: EntityType;
  entityId: string;
}

/**
 * Owner-wins owner resolution chain — see spec §"Routing on workflow
 * completion" §3a. Returns the first non-null candidate in priority
 * order: direct client/company/yacht FK on the document, then via the
 * linked interest's client / yacht FK. The interests table has no
 * companyId (per schema), so the company branch is omitted from the
 * interest fallback. Returns null when no owner is resolvable.
 */
async function resolveDocumentOwner(
  portId: string,
  doc: {
    clientId: string | null;
    companyId: string | null;
    yachtId: string | null;
    interestId: string | null;
  },
): Promise<ResolvedOwner | null> {
  if (doc.clientId) return { entityType: 'client', entityId: doc.clientId };
  if (doc.companyId) return { entityType: 'company', entityId: doc.companyId };
  if (doc.yachtId) return { entityType: 'yacht', entityId: doc.yachtId };

  if (doc.interestId) {
    // interests.clientId is NOT NULL — if the interest row exists, the
    // client owner is always resolvable through it. The yacht-only path
    // would require relaxing the schema constraint first.
    const interest = await db.query.interests.findFirst({
      where: and(eq(interests.id, doc.interestId), eq(interests.portId, portId)),
      columns: { clientId: true },
    });
    if (interest?.clientId) {
      return { entityType: 'client', entityId: interest.clientId };
    }
  }
  return null;
}

export async function handleDocumentCompleted(eventData: { documentId: string; portId?: string }) {
  const doc = await resolveWebhookDocument(eventData.documentId, eventData.portId);
  if (!doc) return;

  // A1: Idempotency gate. Documenso retries DOCUMENT_COMPLETED on receiver
  // 5xx (and the poll worker also reconciles). Without this guard, a second
  // delivery re-runs downloadSignedPdf + storage.put + db.insert(files) and
  // then clobbers the previous signedFileId on the UPDATE — leaking the
  // first file as an orphan blob with no DB pointer. Once we have a signed
  // file id we are done.
  if (doc.status === 'completed' && doc.signedFileId) return;

  // BR-022: Download signed PDF and store in MinIO
  const port = await db.query.ports.findFirst({ where: eq(ports.id, doc.portId) });
  if (!port) {
    logger.error({ portId: doc.portId }, 'Port not found during document completion');
    return;
  }

  // Tracked outside the try so the catch can attempt a compensating
  // storage.delete if we put a blob but failed to commit the DB rows.
  // Without this, partial failures left an orphan blob in storage with
  // no DB pointer (the audit's orphan-blob CRITICAL).
  let putStoragePath: string | null = null;

  try {
    const signedPdfBuffer = await downloadSignedPdf(eventData.documentId);

    // Guard: a 0-byte response from Documenso would otherwise persist a
    // permanent corrupt signedFileId pointing at a blob with no content.
    // Refuse and let the next retry / poll-worker pass re-fetch.
    if (signedPdfBuffer.length === 0) {
      throw new CodedError('DOCUMENSO_EMPTY_PDF', {
        internalMessage: `Documenso returned 0-byte signed PDF for documensoId=${eventData.documentId}`,
      });
    }

    const fileId = crypto.randomUUID();
    const storagePath = buildStoragePath(port.slug, 'eoi-signed', doc.id, fileId, 'pdf');

    await (
      await getStorageBackend()
    ).put(storagePath, signedPdfBuffer, {
      contentType: 'application/pdf',
      sizeBytes: signedPdfBuffer.length,
    });
    putStoragePath = storagePath;

    // Resolve owner via the Owner-wins chain. The signed PDF lands in
    // this owner's auto-created entity subfolder (or at root if no owner).
    const owner = await resolveDocumentOwner(doc.portId, doc);

    let entityFolderId: string | null = null;
    if (owner) {
      try {
        const folder = await ensureEntityFolder(
          doc.portId,
          owner.entityType,
          owner.entityId,
          'system',
        );
        entityFolderId = folder.id;
      } catch (err) {
        // Folder creation is best-effort — signed file still lands at root.
        // Logged at warn level: missing entity folder is recoverable via
        // the backfill script.
        logger.warn(
          { err, documentId: doc.id, owner },
          'ensureEntityFolder failed during document completion',
        );
      }
    }

    // Atomic: the files row + the documents.signedFileId pointer + the
    // reservation contract mirror commit together. If any throws, the
    // outer catch fires storage.delete on the orphan blob.
    const fileRecord = await db.transaction(async (tx) => {
      const [inserted] = await tx
        .insert(files)
        .values({
          portId: doc.portId,
          clientId: owner?.entityType === 'client' ? owner.entityId : (doc.clientId ?? null),
          companyId: owner?.entityType === 'company' ? owner.entityId : (doc.companyId ?? null),
          yachtId: owner?.entityType === 'yacht' ? owner.entityId : (doc.yachtId ?? null),
          folderId: entityFolderId,
          filename: `signed-${doc.id}.pdf`,
          originalName: `signed-${doc.id}.pdf`,
          mimeType: 'application/pdf',
          sizeBytes: String(signedPdfBuffer.length),
          storagePath,
          storageBucket: env.MINIO_BUCKET,
          category: 'eoi',
          uploadedBy: 'system',
        })
        .returning();

      if (!inserted) {
        throw new Error('files.insert returned no row');
      }

      await tx
        .update(documents)
        .set({ status: 'completed', signedFileId: inserted.id, updatedAt: new Date() })
        .where(eq(documents.id, doc.id));

      // Reservation agreements mirror their signed PDF onto
      // berth_reservations.contractFileId so the portal "My Reservations" view
      // can resolve the contract without joining through documents.
      if (doc.documentType === 'reservation_agreement' && doc.reservationId) {
        const { berthReservations } = await import('@/lib/db/schema/reservations');
        await tx
          .update(berthReservations)
          .set({ contractFileId: inserted.id, updatedAt: new Date() })
          .where(eq(berthReservations.id, doc.reservationId));
      }

      return inserted;
    });

    // Mark as durably committed BEFORE side effects so the catch block
    // doesn't try to undo a blob whose DB pointer just landed.
    putStoragePath = null;

    // Audit log: the webhook just minted a new signed-PDF file row owned by
    // 'system'. Without this entry the file appears in the aggregated view
    // with no provenance trail; auditors need to see who/what wrote it.
    void createAuditLog({
      userId: 'system',
      portId: doc.portId,
      action: 'create',
      entityType: 'file',
      entityId: fileRecord.id,
      newValue: {
        filename: fileRecord.filename,
        mimeType: 'application/pdf',
        size: signedPdfBuffer.length,
        documentId: doc.id,
        source: 'documenso_completion',
      },
      ipAddress: '0.0.0.0',
      userAgent: 'webhook',
    });

    // G-C5: reservation agreement signing-complete → contract_signed.
    // Fired here (not below in the eoi-only branch) so contract pipeline
    // tracks reality the same way EOIs do via the eoi_signed advance.
    if (doc.documentType === 'reservation_agreement' && doc.interestId) {
      const systemMeta: AuditMeta = {
        userId: 'system',
        portId: doc.portId,
        ipAddress: '0.0.0.0',
        userAgent: 'webhook',
      };
      void advanceStageIfBehind(
        doc.interestId,
        doc.portId,
        'contract_signed',
        systemMeta,
        'Reservation agreement signed',
      );
      // Dynamic import mirrors the eoi_signed pattern below to avoid the
      // berth-rules-engine module-cycle risk during cold-start.
      void import('@/lib/services/berth-rules-engine').then(({ evaluateRule }) =>
        evaluateRule('contract_signed', doc.interestId!, doc.portId, systemMeta),
      );
    }
  } catch (err) {
    logger.error(
      { err, documentId: doc.id, portId: doc.portId },
      'Failed to download/store signed PDF',
    );

    // Compensating delete: storage.put landed but the DB commit didn't.
    // Without this the blob lives forever with no row pointing at it.
    if (putStoragePath) {
      try {
        await (await getStorageBackend()).delete(putStoragePath);
        logger.info(
          { documentId: doc.id, storagePath: putStoragePath },
          'Compensating storage.delete after failed signed-PDF commit',
        );
      } catch (compErr) {
        // We tried — log so a human can clean up the orphan if needed.
        logger.error(
          { compErr, documentId: doc.id, storagePath: putStoragePath },
          'Compensating storage.delete also failed — manual cleanup required',
        );
      }
    }

    // Critical: do NOT set documents.status = 'completed' on failure.
    // The previous catch block did — which created the "completed-with-
    // no-signedFileId" zombie state the audit flagged. Let the next
    // Documenso retry (or our poll-worker reconciliation) re-attempt;
    // the early-return idempotency gate at the top requires BOTH
    // status='completed' AND signedFileId so re-runs are safe.
  }

  // Update interest if eoi type
  if (doc.interestId && doc.documentType === 'eoi') {
    const interest = await db.query.interests.findFirst({
      where: eq(interests.id, doc.interestId),
    });

    await db
      .update(interests)
      .set({ eoiStatus: 'signed', dateEoiSigned: new Date(), updatedAt: new Date() })
      .where(eq(interests.id, doc.interestId));

    if (interest) {
      const systemMeta: AuditMeta = {
        userId: 'system',
        portId: doc.portId,
        ipAddress: '0.0.0.0',
        userAgent: 'webhook',
      };

      // Guard against double-fire: DOCUMENT_COMPLETED may arrive multiple times
      // (webhook retries) or follow a DOCUMENT_SIGNED that already advanced the
      // stage. advanceStageIfBehind handles the pipeline guard internally, but
      // evaluateRule has no idempotency - skip it if the interest is already at
      // eoi_signed or beyond to prevent duplicate berth-rule side effects.
      const currentStageIdx = PIPELINE_STAGES.indexOf(
        interest.pipelineStage as (typeof PIPELINE_STAGES)[number],
      );
      const eoiSignedIdx = PIPELINE_STAGES.indexOf('eoi_signed');
      if (currentStageIdx < eoiSignedIdx) {
        void evaluateRule('eoi_signed', doc.interestId, doc.portId, systemMeta);
      }

      // Advance to eoi_signed (no-op if interest already past it).
      void advanceStageIfBehind(
        doc.interestId,
        doc.portId,
        'eoi_signed',
        systemMeta,
        'EOI signed via Documenso',
      );
    }
  }

  await db.insert(documentEvents).values({
    documentId: doc.id,
    eventType: 'completed',
    eventData: { documensoId: eventData.documentId },
  });

  emitToRoom(`port:${doc.portId}`, 'document:completed', { documentId: doc.id });

  // Notify the document creator about completion
  if (doc.createdBy && doc.createdBy !== 'system') {
    void import('@/lib/services/notifications.service').then(({ createNotification }) =>
      createNotification({
        portId: doc.portId,
        userId: doc.createdBy!,
        type: 'document_signed',
        title: 'Document fully signed',
        description: `"${doc.title}" has been signed by all parties`,
        link: `/documents/${doc.id}`,
        entityType: 'document',
        entityId: doc.id,
        dedupeKey: `document:${doc.id}:completed`,
      }),
    );
  }
}

export async function handleDocumentExpired(eventData: { documentId: string; portId?: string }) {
  const doc = await resolveWebhookDocument(eventData.documentId, eventData.portId);
  if (!doc) return;

  await db
    .update(documents)
    .set({ status: 'expired', updatedAt: new Date() })
    .where(and(eq(documents.id, doc.id), eq(documents.portId, doc.portId)));

  if (doc.interestId && doc.documentType === 'eoi') {
    await db
      .update(interests)
      .set({ eoiStatus: 'expired', updatedAt: new Date() })
      .where(and(eq(interests.id, doc.interestId), eq(interests.portId, doc.portId)));
  }

  await db.insert(documentEvents).values({
    documentId: doc.id,
    eventType: 'expired',
    eventData: { documensoId: eventData.documentId },
  });

  emitToRoom(`port:${doc.portId}`, 'document:expired', { documentId: doc.id });
}

export async function handleDocumentOpened(eventData: {
  documentId: string;
  recipientEmail: string;
  signatureHash?: string;
  portId?: string;
}) {
  const doc = await resolveWebhookDocument(eventData.documentId, eventData.portId);
  if (!doc) return;

  const [signer] = await db
    .select()
    .from(documentSigners)
    .where(
      and(
        eq(documentSigners.documentId, doc.id),
        eq(documentSigners.signerEmail, eventData.recipientEmail),
      ),
    );

  await db.insert(documentEvents).values({
    documentId: doc.id,
    eventType: 'viewed',
    signerId: signer?.id ?? null,
    signatureHash: eventData.signatureHash ?? null,
    eventData: { recipientEmail: eventData.recipientEmail },
  });

  emitToRoom(`port:${doc.portId}`, 'document:signer:opened', {
    documentId: doc.id,
    signerEmail: eventData.recipientEmail,
  });
}

export async function handleDocumentRejected(eventData: {
  documentId: string;
  recipientEmail?: string;
  signatureHash?: string;
  portId?: string;
}) {
  const doc = await resolveWebhookDocument(eventData.documentId, eventData.portId);
  if (!doc) return;

  let signerId: string | null = null;
  if (eventData.recipientEmail) {
    const [signer] = await db
      .update(documentSigners)
      .set({ status: 'declined' })
      .where(
        and(
          eq(documentSigners.documentId, doc.id),
          eq(documentSigners.signerEmail, eventData.recipientEmail),
        ),
      )
      .returning();
    signerId = signer?.id ?? null;
  }

  await db
    .update(documents)
    .set({ status: 'rejected', updatedAt: new Date() })
    .where(and(eq(documents.id, doc.id), eq(documents.portId, doc.portId)));

  if (doc.interestId && doc.documentType === 'eoi') {
    await db
      .update(interests)
      .set({ eoiStatus: 'rejected', updatedAt: new Date() })
      .where(and(eq(interests.id, doc.interestId), eq(interests.portId, doc.portId)));
  }

  await db.insert(documentEvents).values({
    documentId: doc.id,
    eventType: 'rejected',
    signerId,
    signatureHash: eventData.signatureHash ?? null,
    eventData: { recipientEmail: eventData.recipientEmail ?? null },
  });

  emitToRoom(`port:${doc.portId}`, 'document:rejected', {
    documentId: doc.id,
    signerEmail: eventData.recipientEmail ?? null,
  });
}

export async function handleDocumentCancelled(eventData: {
  documentId: string;
  signatureHash?: string;
  portId?: string;
}) {
  const doc = await resolveWebhookDocument(eventData.documentId, eventData.portId);
  if (!doc) return;

  await db
    .update(documents)
    .set({ status: 'cancelled', updatedAt: new Date() })
    .where(and(eq(documents.id, doc.id), eq(documents.portId, doc.portId)));

  if (doc.interestId && doc.documentType === 'eoi') {
    await db
      .update(interests)
      .set({ eoiStatus: 'cancelled', updatedAt: new Date() })
      .where(and(eq(interests.id, doc.interestId), eq(interests.portId, doc.portId)));
  }

  await db.insert(documentEvents).values({
    documentId: doc.id,
    eventType: 'cancelled',
    signatureHash: eventData.signatureHash ?? null,
    eventData: { documensoId: eventData.documentId },
  });

  emitToRoom(`port:${doc.portId}`, 'document:cancelled', { documentId: doc.id });
}

// ─── Phase A: hub + wizard surface (PR1 skeletons; bodies land in PRs 4-6) ────

export interface DocumentDetailWatcher {
  userId: string;
  addedBy: string;
  addedAt: Date;
}

export interface DocumentDetail {
  document: typeof documents.$inferSelect;
  signers: (typeof documentSigners.$inferSelect)[];
  events: (typeof documentEvents.$inferSelect)[];
  watchers: DocumentDetailWatcher[];
}

/**
 * Single-roundtrip aggregator for the document detail page (PR5).
 * Returns the document plus all signers, events (newest first), and watchers.
 * Throws NotFoundError if the document is not in `portId`.
 */
export async function getDocumentDetail(id: string, portId: string): Promise<DocumentDetail> {
  const document = await getDocumentById(id, portId);

  const [signers, events, watchers] = await Promise.all([
    db.query.documentSigners.findMany({
      where: eq(documentSigners.documentId, id),
      orderBy: (ds, { asc }) => [asc(ds.signingOrder)],
    }),
    db.query.documentEvents.findMany({
      where: eq(documentEvents.documentId, id),
      orderBy: (de, { desc }) => [desc(de.createdAt)],
    }),
    db
      .select({
        userId: documentWatchers.userId,
        addedBy: documentWatchers.addedBy,
        addedAt: documentWatchers.addedAt,
      })
      .from(documentWatchers)
      .where(eq(documentWatchers.documentId, id)),
  ]);

  return { document, signers, events, watchers };
}

/**
 * User-initiated cancel of an in-flight document. Voids the doc in Documenso
 * (when present), updates DB status, logs an event, emits socket. Webhook
 * receiver also handles documenso-initiated cancellations via
 * `handleDocumentCancelled`.
 *
 * The actual Documenso void call lands in PR2 (`documenso-client.voidDocument`);
 * this skeleton updates DB state only.
 */
export async function cancelDocument(
  documentId: string,
  portId: string,
  meta: AuditMeta,
): Promise<typeof documents.$inferSelect> {
  const existing = await getDocumentById(documentId, portId);

  if (['completed', 'cancelled', 'rejected'].includes(existing.status)) {
    throw new ConflictError(`Document is already ${existing.status}`);
  }

  // CRM is the system of record for cancellation status. A transient
  // Documenso failure shouldn't block the user from marking the doc cancelled
  // here - voidDocument already treats 404 as success, and the periodic
  // webhook receiver will reconcile if the remote void eventually lands.
  if (existing.documensoId) {
    try {
      await documensoVoid(existing.documensoId, portId);
    } catch (err) {
      logger.warn(
        { err, documentId, documensoId: existing.documensoId },
        'Documenso void failed; cancelling locally anyway',
      );
    }
  }

  const [updated] = await db
    .update(documents)
    .set({ status: 'cancelled', updatedAt: new Date() })
    .where(and(eq(documents.id, documentId), eq(documents.portId, portId)))
    .returning();

  await db.insert(documentEvents).values({
    documentId,
    eventType: 'cancelled',
    eventData: { initiatedBy: meta.userId },
  });

  void createAuditLog({
    userId: meta.userId,
    portId,
    action: 'update',
    entityType: 'document',
    entityId: documentId,
    oldValue: { status: existing.status },
    newValue: { status: 'cancelled' },
    ipAddress: meta.ipAddress,
    userAgent: meta.userAgent,
  });

  emitToRoom(`port:${portId}`, 'document:cancelled', { documentId });

  return updated!;
}

/**
 * Returns prefilled email composer payload for the "Email signed PDF to all
 * signatories" action on the document detail page.
 *
 * Available for `status='completed' && signedFileId !== null`.
 *
 * Body content (from per-port `signed_doc_completion` template), full
 * sender-resolution, and watcher-cc helpers land alongside PR8 (email
 * composer with attachments). For PR1 this returns the minimal correct
 * recipients + auto-attachment shape so detail-page integration tests can
 * assert against it.
 */
export interface ComposeSignedDocEmailResult {
  to: string[];
  cc: string[];
  subject: string;
  body: string;
  attachments: Array<{ fileId: string; filename?: string }>;
  defaultSenderType: 'system' | 'user';
}

export async function composeSignedDocEmail(
  documentId: string,
  portId: string,
): Promise<ComposeSignedDocEmailResult> {
  const doc = await getDocumentById(documentId, portId);

  if (doc.status !== 'completed') {
    throw new ConflictError('Document is not completed');
  }
  if (!doc.signedFileId) {
    throw new ValidationError('Document has no signed PDF');
  }

  const signers = await db
    .select({ email: documentSigners.signerEmail })
    .from(documentSigners)
    .where(eq(documentSigners.documentId, documentId));

  const dedupedRecipients = Array.from(new Set(signers.map((s) => s.email)));

  return {
    to: dedupedRecipients,
    cc: [],
    subject: `Signed ${doc.documentType.replace(/_/g, ' ')} - ${doc.title}`,
    body: '',
    attachments: [{ fileId: doc.signedFileId }],
    defaultSenderType: 'system',
  };
}

// ─── Watchers (PR5) ───────────────────────────────────────────────────────────

export async function listDocumentWatchers(documentId: string, portId: string) {
  await getDocumentById(documentId, portId); // port-scope check
  return db
    .select({
      userId: documentWatchers.userId,
      addedBy: documentWatchers.addedBy,
      addedAt: documentWatchers.addedAt,
    })
    .from(documentWatchers)
    .where(eq(documentWatchers.documentId, documentId));
}

export async function addDocumentWatcher(
  documentId: string,
  portId: string,
  userId: string,
  meta: AuditMeta,
): Promise<{ userId: string; addedAt: Date }> {
  await getDocumentById(documentId, portId);
  await assertWatchersInPort(portId, [userId]);
  const [row] = await db
    .insert(documentWatchers)
    .values({ documentId, userId, addedBy: meta.userId })
    .onConflictDoNothing()
    .returning();
  void createAuditLog({
    userId: meta.userId,
    portId,
    action: 'create',
    entityType: 'document_watcher',
    entityId: documentId,
    newValue: { documentId, watcherUserId: userId },
    ipAddress: meta.ipAddress,
    userAgent: meta.userAgent,
  });
  emitToRoom(`port:${portId}`, 'document:updated', { documentId });
  return row ? { userId: row.userId, addedAt: row.addedAt } : { userId, addedAt: new Date() };
}

export async function removeDocumentWatcher(
  documentId: string,
  portId: string,
  userId: string,
  meta: AuditMeta,
): Promise<void> {
  await getDocumentById(documentId, portId);
  await db
    .delete(documentWatchers)
    .where(and(eq(documentWatchers.documentId, documentId), eq(documentWatchers.userId, userId)));
  void createAuditLog({
    userId: meta.userId,
    portId,
    action: 'delete',
    entityType: 'document_watcher',
    entityId: documentId,
    oldValue: { documentId, watcherUserId: userId },
    ipAddress: meta.ipAddress,
    userAgent: meta.userAgent,
  });
  emitToRoom(`port:${portId}`, 'document:updated', { documentId });
}

/**
 * Create-document wizard entry point (PR6).
 *
 * Dispatches across pathways:
 *   - 'documenso-template' - Documenso renders + signs from its own template
 *   - 'inapp' - render PDF locally from a CRM template, upload to Documenso
 *   - 'upload' - admin-supplied PDF, upload to Documenso (auto-place signature
 *     fields if `autoPlaceFields`)
 *
 * Persists the document, applies reminder overrides, attaches watchers, and
 * triggers send when `sendImmediately`.
 */
import type { CreateDocumentWizardInput } from '@/lib/validators/documents';

export async function createFromWizard(
  portId: string,
  data: CreateDocumentWizardInput,
  meta: AuditMeta,
): Promise<typeof documents.$inferSelect> {
  if (data.source === 'upload') {
    return createFromUpload(portId, data, meta);
  }

  if (!data.templateId) {
    throw new ValidationError('templateId is required for template source');
  }

  await assertSubjectFksInPort(portId, {
    clientId: data.clientId,
    interestId: data.interestId,
    companyId: data.companyId,
    yachtId: data.yachtId,
    reservationId: data.reservationId,
  });

  const [doc] = await db
    .insert(documents)
    .values({
      portId,
      interestId: data.interestId ?? null,
      reservationId: data.reservationId ?? null,
      clientId: data.clientId ?? null,
      companyId: data.companyId ?? null,
      yachtId: data.yachtId ?? null,
      documentType: data.documentType,
      title: data.title,
      notes: data.notes ?? null,
      status: 'draft',
      remindersDisabled: data.remindersDisabled,
      reminderCadenceOverride: data.reminderCadenceOverride ?? null,
      createdBy: meta.userId,
    })
    .returning();

  if (!doc)
    throw new CodedError('INSERT_RETURNING_EMPTY', {
      internalMessage: 'Failed to insert document',
    });

  if (data.watchers.length > 0) {
    await assertWatchersInPort(portId, data.watchers);
    await db.insert(documentWatchers).values(
      data.watchers.map((userId) => ({
        documentId: doc.id,
        userId,
        addedBy: meta.userId,
      })),
    );
  }

  void createAuditLog({
    userId: meta.userId,
    portId,
    action: 'create',
    entityType: 'document',
    entityId: doc.id,
    newValue: {
      documentType: doc.documentType,
      title: doc.title,
      pathway: data.pathway,
      source: data.source,
    },
    ipAddress: meta.ipAddress,
    userAgent: meta.userAgent,
  });

  emitToRoom(`port:${portId}`, 'document:created', { documentId: doc.id });

  return doc;
}

/**
 * Upload-driven creation path. Files-service integration + Documenso upload
 * + auto-place signature fields land alongside the realapi PR (PR11). For
 * PR6 we persist the document row + signers + watchers and leave the
 * Documenso upload step to the existing sendForSigning flow on first send.
 */
export async function createFromUpload(
  portId: string,
  data: CreateDocumentWizardInput,
  meta: AuditMeta,
): Promise<typeof documents.$inferSelect> {
  if (!data.uploadedFileId) {
    throw new ValidationError('uploadedFileId is required for upload source');
  }
  if (!data.signers || data.signers.length === 0) {
    throw new ValidationError('signers are required for upload source');
  }

  const fileRecord = await db.query.files.findFirst({
    where: and(eq(files.id, data.uploadedFileId), eq(files.portId, portId)),
  });
  if (!fileRecord) {
    throw new NotFoundError('File');
  }

  await assertSubjectFksInPort(portId, {
    clientId: data.clientId,
    interestId: data.interestId,
    companyId: data.companyId,
    yachtId: data.yachtId,
    reservationId: data.reservationId,
  });

  const [doc] = await db
    .insert(documents)
    .values({
      portId,
      interestId: data.interestId ?? null,
      reservationId: data.reservationId ?? null,
      clientId: data.clientId ?? null,
      companyId: data.companyId ?? null,
      yachtId: data.yachtId ?? null,
      documentType: data.documentType,
      title: data.title,
      notes: data.notes ?? null,
      status: 'draft',
      fileId: fileRecord.id,
      remindersDisabled: data.remindersDisabled,
      reminderCadenceOverride: data.reminderCadenceOverride ?? null,
      createdBy: meta.userId,
    })
    .returning();
  if (!doc)
    throw new CodedError('INSERT_RETURNING_EMPTY', {
      internalMessage: 'Failed to insert document',
    });

  await db.insert(documentSigners).values(
    data.signers.map((s) => ({
      documentId: doc.id,
      signerName: s.signerName,
      signerEmail: s.signerEmail,
      signerRole: s.signerRole,
      signingOrder: s.signingOrder,
      status: 'pending' as const,
    })),
  );

  if (data.watchers.length > 0) {
    await assertWatchersInPort(portId, data.watchers);
    await db.insert(documentWatchers).values(
      data.watchers.map((userId) => ({
        documentId: doc.id,
        userId,
        addedBy: meta.userId,
      })),
    );
  }

  void createAuditLog({
    userId: meta.userId,
    portId,
    action: 'create',
    entityType: 'document',
    entityId: doc.id,
    newValue: {
      documentType: doc.documentType,
      title: doc.title,
      pathway: 'upload',
      source: 'upload',
      uploadedFileId: fileRecord.id,
    },
    ipAddress: meta.ipAddress,
    userAgent: meta.userAgent,
  });

  emitToRoom(`port:${portId}`, 'document:created', { documentId: doc.id });

  return doc;
}

// ─── Aggregated Workflow Projection ───────────────────────────────────────────

export interface AggregatedWorkflowGroup {
  label: string;
  source: 'direct' | 'client' | 'company' | 'yacht';
  workflows: Array<typeof documents.$inferSelect>;
  total: number;
}

const WORKFLOW_GROUP_LIMIT = 20;
const INFLIGHT_STATUSES = ['draft', 'sent', 'partially_signed'] as const;

/**
 * Same projection shape as listFilesAggregatedByEntity but for in-flight
 * signing workflows. Completed/expired/cancelled workflows are hidden —
 * they surface via their signed-PDF file row.
 */
export async function listInflightWorkflowsAggregatedByEntity(
  portId: string,
  entityType: 'client' | 'company' | 'yacht',
  entityId: string,
): Promise<{ groups: AggregatedWorkflowGroup[] }> {
  const entityExists = await assertEntityInPort(portId, entityType, entityId);
  if (!entityExists) return { groups: [] };

  const related = await collectRelatedEntities(portId, entityType, entityId);
  const groups: AggregatedWorkflowGroup[] = [];

  const directColumn =
    entityType === 'client'
      ? documents.clientId
      : entityType === 'company'
        ? documents.companyId
        : documents.yachtId;

  const direct = await fetchWorkflowGroupRows(portId, eq(directColumn, entityId));
  if (direct.rows.length > 0) {
    groups.push({
      label: 'DIRECTLY ATTACHED',
      source: 'direct',
      workflows: direct.rows,
      total: direct.total,
    });
  }

  for (const { id, name } of related.companies) {
    const g = await fetchWorkflowGroupRows(portId, eq(documents.companyId, id));
    if (g.rows.length === 0) continue;
    groups.push({
      label: `FROM COMPANY: ${name.toUpperCase()}`,
      source: 'company',
      workflows: g.rows,
      total: g.total,
    });
  }

  for (const { id, name } of related.yachts) {
    const g = await fetchWorkflowGroupRows(portId, eq(documents.yachtId, id));
    if (g.rows.length === 0) continue;
    groups.push({
      label: `FROM YACHT: ${name.toUpperCase()}`,
      source: 'yacht',
      workflows: g.rows,
      total: g.total,
    });
  }

  for (const { id, name } of related.clients) {
    const g = await fetchWorkflowGroupRows(portId, eq(documents.clientId, id));
    if (g.rows.length === 0) continue;
    groups.push({
      label: `FROM CLIENT: ${name.toUpperCase()}`,
      source: 'client',
      workflows: g.rows,
      total: g.total,
    });
  }

  return { groups };
}

async function fetchWorkflowGroupRows(
  portId: string,
  predicate: ReturnType<typeof eq>,
): Promise<{ rows: Array<typeof documents.$inferSelect>; total: number }> {
  const inflightStatuses = INFLIGHT_STATUSES as unknown as string[];

  const rows = await db
    .select()
    .from(documents)
    .where(
      and(eq(documents.portId, portId), inArray(documents.status, inflightStatuses), predicate),
    )
    .orderBy(desc(documents.updatedAt))
    .limit(WORKFLOW_GROUP_LIMIT);

  const [countRow] = await db
    .select({ count: sql<number>`count(*)::int` })
    .from(documents)
    .where(
      and(eq(documents.portId, portId), inArray(documents.status, inflightStatuses), predicate),
    );

  return { rows, total: Number(countRow?.count ?? 0) };
}
