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

import { db } from '@/lib/db';
import { berths, berthTags, berthWaitingList, berthMaintenanceLog } from '@/lib/db/schema/berths';
import { clients } from '@/lib/db/schema/clients';
import { interestBerths, interests } from '@/lib/db/schema/interests';
import { tags } from '@/lib/db/schema/system';
import { PIPELINE_STAGES } from '@/lib/constants';
import { createAuditLog, toAuditJson, type AuditMeta } from '@/lib/audit';
import { diffEntity } from '@/lib/entity-diff';
import { NotFoundError, ValidationError } from '@/lib/errors';
import { buildListQuery } from '@/lib/db/query-builder';
import { emitToRoom } from '@/lib/socket/server';
import { setEntityTags } from '@/lib/services/entity-tags.helper';
import { getPortBerthsDefaultCurrency } from '@/lib/services/port-config';
import { ConflictError } from '@/lib/errors';
import { sortByMooring } from '@/lib/utils/mooring-sort';
import type {
  CreateBerthInput,
  UpdateBerthInput,
  UpdateBerthStatusInput,
  ListBerthsQuery,
  AddMaintenanceLogInput,
  UpdateWaitingListInput,
} from '@/lib/validators/berths';

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

export async function listBerths(portId: string, query: ListBerthsQuery) {
  const filters = [];

  if (query.status) {
    filters.push(eq(berths.status, query.status));
  }
  if (query.area) {
    filters.push(eq(berths.area, query.area));
  }
  if (query.minLength !== undefined) {
    filters.push(gte(berths.lengthM, String(query.minLength)));
  }
  if (query.maxLength !== undefined) {
    filters.push(lte(berths.lengthM, String(query.maxLength)));
  }
  if (query.minPrice !== undefined) {
    filters.push(gte(berths.price, String(query.minPrice)));
  }
  if (query.maxPrice !== undefined) {
    filters.push(lte(berths.price, String(query.maxPrice)));
  }
  if (query.tenureType) {
    filters.push(eq(berths.tenureType, query.tenureType));
  }

  // Tag filter: join against berthTags
  if (query.tagIds && query.tagIds.length > 0) {
    const tagIds = query.tagIds;
    const berthsWithTags = await db
      .selectDistinct({ berthId: berthTags.berthId })
      .from(berthTags)
      .where(inArray(berthTags.tagId, tagIds));
    const matchingIds = berthsWithTags.map((r) => r.berthId);
    if (matchingIds.length === 0) {
      return { data: [], total: 0 };
    }
    filters.push(inArray(berths.id, matchingIds));
  }

  // Default ordering is natural alphanumeric on mooring number
  // (A1, A2, A10, B1...) — Postgres' default lexicographic sort
  // would put A10 before A2, which is the wrong story for a marina
  // map. The mooring format is locked at `^[A-Z]+\d+$` so the regexp
  // splits are safe.
  const NATURAL_MOORING_SORT = [
    sql`regexp_replace(${berths.mooringNumber}, '[0-9]+$', '') ASC`,
    sql`(regexp_replace(${berths.mooringNumber}, '^[A-Z]+', ''))::int ASC`,
  ];

  const sortColumn = (() => {
    switch (query.sort) {
      case 'mooringNumber':
        // Honoured via customOrderBy below — caller asked for mooring
        // sort explicitly, give them the natural order.
        return null;
      case 'area':
        return berths.area;
      case 'price':
        return berths.price;
      case 'status':
        return berths.status;
      case 'lengthM':
        return berths.lengthM;
      default:
        // No sort requested → natural mooring order is the friendliest
        // default for the berth grid (groups by pontoon letter).
        return null;
    }
  })();

  const result = await buildListQuery({
    table: berths,
    portIdColumn: berths.portId,
    portId,
    idColumn: berths.id,
    updatedAtColumn: berths.updatedAt,
    filters,
    sort: sortColumn ? { column: sortColumn, direction: query.order } : undefined,
    customOrderBy: sortColumn ? undefined : NATURAL_MOORING_SORT,
    page: query.page,
    pageSize: query.limit,
    searchColumns: [berths.mooringNumber, berths.area],
    searchTerm: query.search,
    // No archivedAt column on berths
    includeArchived: true,
  });

  // Attach tags for list items
  const berthIds = (result.data as Array<{ id: string }>).map((b) => b.id);
  const tagsByBerthId: Record<string, Array<{ id: string; name: string; color: string }>> = {};

  if (berthIds.length > 0) {
    const tagRows = await db
      .select({
        berthId: berthTags.berthId,
        id: tags.id,
        name: tags.name,
        color: tags.color,
      })
      .from(berthTags)
      .innerJoin(tags, eq(berthTags.tagId, tags.id))
      .where(inArray(berthTags.berthId, berthIds));

    for (const row of tagRows) {
      if (!tagsByBerthId[row.berthId]) tagsByBerthId[row.berthId] = [];
      tagsByBerthId[row.berthId]!.push({ id: row.id, name: row.name, color: row.color });
    }
  }

  const latestStageByBerthId = await getLatestInterestStageByBerth(berthIds, portId);

  const data = (result.data as Array<Record<string, unknown>>).map((b) => ({
    ...b,
    tags: tagsByBerthId[b.id as string] ?? [],
    latestInterestStage: latestStageByBerthId[b.id as string] ?? null,
  }));

  return { data, total: result.total };
}

/**
 * For each berth id, returns the most-advanced pipeline stage among its
 * linked active interests (outcome IS NULL, not archived). Used by the
 * berth list + detail to surface the deal furthest along on a berth so
 * reps can see at a glance whether a berth is "Reservation Sent" via
 * its connected interest, even though berth.status only tracks
 * available/under_offer/sold.
 */
async function getLatestInterestStageByBerth(
  berthIds: string[],
  portId: string,
): Promise<Record<string, string>> {
  if (berthIds.length === 0) return {};
  const rows = await db
    .select({
      berthId: interestBerths.berthId,
      pipelineStage: interests.pipelineStage,
    })
    .from(interestBerths)
    .innerJoin(interests, eq(interestBerths.interestId, interests.id))
    .where(
      and(
        eq(interests.portId, portId),
        inArray(interestBerths.berthId, berthIds),
        isNull(interests.outcome),
        isNull(interests.archivedAt),
      ),
    );

  // Pipeline stages are an ordered enum — rank by position in PIPELINE_STAGES
  // so "contract_signed" beats "eoi_sent". Falls back to 0 for any unknown
  // legacy values so they're treated as least-advanced.
  const rankOf = (stage: string) => {
    const idx = (PIPELINE_STAGES as readonly string[]).indexOf(stage);
    return idx === -1 ? -1 : idx;
  };
  const top: Record<string, string> = {};
  for (const row of rows) {
    const current = top[row.berthId];
    if (!current || rankOf(row.pipelineStage) > rankOf(current)) {
      top[row.berthId] = row.pipelineStage;
    }
  }
  return top;
}

// ─── Get By ID ────────────────────────────────────────────────────────────────

export async function getBerthById(id: string, portId: string) {
  const berth = await db.query.berths.findFirst({
    where: and(eq(berths.id, id), eq(berths.portId, portId)),
    with: {
      mapData: true,
    },
  });

  if (!berth) throw new NotFoundError('Berth');

  // Fetch tags
  const tagRows = await db
    .select({ id: tags.id, name: tags.name, color: tags.color })
    .from(berthTags)
    .innerJoin(tags, eq(berthTags.tagId, tags.id))
    .where(eq(berthTags.berthId, id));

  const latestStageMap = await getLatestInterestStageByBerth([id], portId);

  return {
    ...berth,
    tags: tagRows,
    latestInterestStage: latestStageMap[id] ?? null,
  };
}

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

export async function updateBerth(
  id: string,
  portId: string,
  data: UpdateBerthInput,
  meta: AuditMeta,
) {
  const existing = await db.query.berths.findFirst({
    where: and(eq(berths.id, id), eq(berths.portId, portId)),
  });
  if (!existing) throw new NotFoundError('Berth');

  const { changed, diff } = diffEntity(
    existing as Record<string, unknown>,
    data as Record<string, unknown>,
  );

  if (!changed) return existing;

  // Drizzle numeric columns expect string | null - coerce numbers to strings
  const n = (v: number | undefined) => (v !== undefined ? String(v) : undefined);

  const [updated] = await db
    .update(berths)
    .set({
      area: data.area,
      lengthFt: n(data.lengthFt),
      lengthM: n(data.lengthM),
      widthFt: n(data.widthFt),
      widthM: n(data.widthM),
      draftFt: n(data.draftFt),
      draftM: n(data.draftM),
      widthIsMinimum: data.widthIsMinimum,
      nominalBoatSize: n(data.nominalBoatSize),
      nominalBoatSizeM: n(data.nominalBoatSizeM),
      waterDepth: n(data.waterDepth),
      waterDepthM: n(data.waterDepthM),
      waterDepthIsMinimum: data.waterDepthIsMinimum,
      sidePontoon: data.sidePontoon,
      powerCapacity: n(data.powerCapacity),
      voltage: n(data.voltage),
      mooringType: data.mooringType,
      cleatType: data.cleatType,
      cleatCapacity: data.cleatCapacity,
      bollardType: data.bollardType,
      bollardCapacity: data.bollardCapacity,
      access: data.access,
      price: n(data.price),
      priceCurrency: data.priceCurrency,
      bowFacing: data.bowFacing,
      berthApproved: data.berthApproved,
      tenureType: data.tenureType,
      tenureYears: data.tenureYears,
      tenureStartDate: data.tenureStartDate,
      tenureEndDate: data.tenureEndDate,
      updatedAt: new Date(),
    })
    .where(and(eq(berths.id, id), eq(berths.portId, portId)))
    .returning();

  void createAuditLog({
    userId: meta.userId,
    portId,
    action: 'update',
    entityType: 'berth',
    entityId: id,
    oldValue: toAuditJson(diff),
    newValue: toAuditJson(data),
    ipAddress: meta.ipAddress,
    userAgent: meta.userAgent,
  });

  emitToRoom(`port:${portId}`, 'berth:updated', {
    berthId: id,
    changedFields: Object.keys(diff),
  });

  void import('@/lib/services/webhook-dispatch').then(({ dispatchWebhookEvent }) =>
    dispatchWebhookEvent(portId, 'berth:updated', { berthId: id }),
  );

  return updated!;
}

// ─── Update Status ────────────────────────────────────────────────────────────

export async function updateBerthStatus(
  id: string,
  portId: string,
  data: UpdateBerthStatusInput,
  meta: AuditMeta,
) {
  const existing = await db.query.berths.findFirst({
    where: and(eq(berths.id, id), eq(berths.portId, portId)),
  });
  if (!existing) throw new NotFoundError('Berth');

  const [updated] = await db
    .update(berths)
    .set({
      status: data.status,
      statusLastChangedBy: meta.userId,
      statusLastChangedReason: data.reason,
      statusLastModified: new Date(),
      updatedAt: new Date(),
    })
    .where(and(eq(berths.id, id), eq(berths.portId, portId)))
    .returning();

  void createAuditLog({
    userId: meta.userId,
    portId,
    action: 'update',
    entityType: 'berth',
    entityId: id,
    oldValue: { status: existing.status },
    newValue: { status: data.status, reason: data.reason },
    metadata: { type: 'status_change', reason: data.reason },
    ipAddress: meta.ipAddress,
    userAgent: meta.userAgent,
  });

  emitToRoom(`port:${portId}`, 'berth:statusChanged', {
    berthId: id,
    oldStatus: existing.status,
    newStatus: data.status,
    triggeredBy: meta.userId,
  });

  void import('@/lib/services/webhook-dispatch').then(({ dispatchWebhookEvent }) =>
    dispatchWebhookEvent(portId, 'berth:statusChanged', {
      berthId: id,
      oldStatus: existing.status,
      newStatus: data.status,
    }),
  );

  // Optional: link the chosen interest as the primary holder of this
  // berth. Cross-port checks live inside the helper so a malicious
  // interestId from another port can't slip past the status PATCH.
  if (data.interestId) {
    const { setPrimaryBerth } = await import('@/lib/services/interest-berths.service');
    await setPrimaryBerth(data.interestId, id);
  }

  return updated!;
}

// ─── Set Tags ─────────────────────────────────────────────────────────────────

export async function setBerthTags(id: string, portId: string, tagIds: string[], meta: AuditMeta) {
  const existing = await db.query.berths.findFirst({
    where: and(eq(berths.id, id), eq(berths.portId, portId)),
  });
  if (!existing) throw new NotFoundError('Berth');

  const result = await setEntityTags({
    joinTable: berthTags,
    entityColumn: berthTags.berthId,
    tagColumn: berthTags.tagId,
    entityId: id,
    portId,
    tagIds,
    meta,
    entityType: 'berth',
  });

  return { berthId: result.entityId, tagIds: result.tagIds };
}

// ─── Add Maintenance Log ──────────────────────────────────────────────────────

export async function addMaintenanceLog(
  id: string,
  portId: string,
  data: AddMaintenanceLogInput,
  meta: AuditMeta,
) {
  const existing = await db.query.berths.findFirst({
    where: and(eq(berths.id, id), eq(berths.portId, portId)),
  });
  if (!existing) throw new NotFoundError('Berth');

  const rows = await db
    .insert(berthMaintenanceLog)
    .values({
      berthId: id,
      portId,
      category: data.category,
      description: data.description,
      cost: data.cost !== undefined ? String(data.cost) : undefined,
      costCurrency: data.costCurrency,
      responsibleParty: data.responsibleParty,
      performedDate: data.performedDate,
      photoFileIds: data.photoFileIds,
      createdBy: meta.userId,
    })
    .returning();

  const log = rows[0]!;

  void createAuditLog({
    userId: meta.userId,
    portId,
    action: 'create',
    entityType: 'berth_maintenance_log',
    entityId: log.id,
    metadata: { berthId: id, category: data.category },
    ipAddress: meta.ipAddress,
    userAgent: meta.userAgent,
  });

  emitToRoom(`port:${portId}`, 'berth:maintenanceAdded', {
    berthId: id,
    logEntry: log,
  });

  return log;
}

// ─── Get Maintenance Logs ─────────────────────────────────────────────────────

export async function getMaintenanceLogs(id: string, portId: string) {
  const existing = await db.query.berths.findFirst({
    where: and(eq(berths.id, id), eq(berths.portId, portId)),
  });
  if (!existing) throw new NotFoundError('Berth');

  return db
    .select()
    .from(berthMaintenanceLog)
    .where(and(eq(berthMaintenanceLog.berthId, id), eq(berthMaintenanceLog.portId, portId)))
    .orderBy(berthMaintenanceLog.performedDate);
}

// ─── Get Waiting List ─────────────────────────────────────────────────────────

export async function getWaitingList(id: string, portId: string) {
  const existing = await db.query.berths.findFirst({
    where: and(eq(berths.id, id), eq(berths.portId, portId)),
  });
  if (!existing) throw new NotFoundError('Berth');

  return db
    .select()
    .from(berthWaitingList)
    .where(eq(berthWaitingList.berthId, id))
    .orderBy(berthWaitingList.position);
}

// ─── Update Waiting List ──────────────────────────────────────────────────────

export async function updateWaitingList(
  id: string,
  portId: string,
  data: UpdateWaitingListInput,
  meta: AuditMeta,
) {
  const existing = await db.query.berths.findFirst({
    where: and(eq(berths.id, id), eq(berths.portId, portId)),
  });
  if (!existing) throw new NotFoundError('Berth');

  // Validate every supplied clientId belongs to portId. Without this
  // check, a port-A admin could insert port-B clientIds into the
  // waiting list - corrupting reportable data and creating a join
  // surface that hydrates foreign-tenant client rows.
  if (data.entries.length > 0) {
    const clientIds = [...new Set(data.entries.map((e) => e.clientId))];
    const validClients = await db
      .select({ id: clients.id })
      .from(clients)
      .where(and(inArray(clients.id, clientIds), eq(clients.portId, portId)));
    if (validClients.length !== clientIds.length) {
      throw new ValidationError('One or more clients are not in this port');
    }
  }

  // Replace entire waiting list
  await db.delete(berthWaitingList).where(eq(berthWaitingList.berthId, id));

  if (data.entries.length > 0) {
    await db.insert(berthWaitingList).values(
      data.entries.map((entry) => ({
        berthId: id,
        clientId: entry.clientId,
        position: entry.position,
        priority: entry.priority ?? 'normal',
        notifyPref: entry.notifyPref ?? 'email',
        notes: entry.notes,
      })),
    );
  }

  void createAuditLog({
    userId: meta.userId,
    portId,
    action: 'update',
    entityType: 'berth',
    entityId: id,
    metadata: { type: 'waiting_list_updated', count: data.entries.length },
    ipAddress: meta.ipAddress,
    userAgent: meta.userAgent,
  });

  emitToRoom(`port:${portId}`, 'berth:waitingListChanged', {
    berthId: id,
    action: 'replaced',
    entry: data.entries,
  });

  return data.entries;
}

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

export async function createBerth(portId: string, data: CreateBerthInput, meta: AuditMeta) {
  // Check mooring number uniqueness within port
  const existing = await db.query.berths.findFirst({
    where: and(eq(berths.portId, portId), eq(berths.mooringNumber, data.mooringNumber)),
  });
  if (existing) {
    throw new ConflictError(`Berth "${data.mooringNumber}" already exists in this port`);
  }

  // Caller-specified currency wins; otherwise inherit the port's admin-
  // configured default (system_settings.berths_default_currency, USD if
  // unset). Lets a multi-currency portfolio be modelled cleanly without
  // forcing reps to pick a currency on every new-berth form.
  const resolvedCurrency = data.priceCurrency ?? (await getPortBerthsDefaultCurrency(portId));

  const [berth] = await db
    .insert(berths)
    .values({
      portId,
      mooringNumber: data.mooringNumber,
      area: data.area,
      status: data.status ?? 'available',
      lengthFt: data.lengthFt?.toString(),
      lengthM: data.lengthM?.toString(),
      widthFt: data.widthFt?.toString(),
      widthM: data.widthM?.toString(),
      draftFt: data.draftFt?.toString(),
      draftM: data.draftM?.toString(),
      price: data.price?.toString(),
      priceCurrency: resolvedCurrency,
      tenureType: data.tenureType ?? 'permanent',
      mooringType: data.mooringType,
      powerCapacity: data.powerCapacity?.toString(),
      voltage: data.voltage?.toString(),
      access: data.access,
      bowFacing: data.bowFacing,
      sidePontoon: data.sidePontoon,
    })
    .returning();

  void createAuditLog({
    userId: meta.userId,
    portId,
    action: 'create',
    entityType: 'berth',
    entityId: berth!.id,
    newValue: { mooringNumber: berth!.mooringNumber, area: berth!.area },
    ipAddress: meta.ipAddress,
    userAgent: meta.userAgent,
  });

  emitToRoom(`port:${portId}`, 'system:alert', {
    alertType: 'berth:created',
    message: `Berth "${berth!.mooringNumber}" created`,
    severity: 'info',
  });

  return berth!;
}

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

export async function deleteBerth(id: string, portId: string, meta: AuditMeta) {
  const berth = await db.query.berths.findFirst({
    where: and(eq(berths.id, id), eq(berths.portId, portId)),
  });
  if (!berth) throw new NotFoundError('Berth');

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

  void createAuditLog({
    userId: meta.userId,
    portId,
    action: 'delete',
    entityType: 'berth',
    entityId: id,
    oldValue: { mooringNumber: berth.mooringNumber, area: berth.area },
    ipAddress: meta.ipAddress,
    userAgent: meta.userAgent,
  });

  emitToRoom(`port:${portId}`, 'system:alert', {
    alertType: 'berth:deleted',
    message: `Berth "${berth.mooringNumber}" deleted`,
    severity: 'info',
  });
}

// ─── Options ──────────────────────────────────────────────────────────────────

export async function getBerthOptions(portId: string) {
  // DB-side `ORDER BY mooring_number` is lexicographic (A1, A10, A11, A2…).
  // Natural-sort in JS so dropdowns surface them as reps read them: A1, A2,
  // …, A10, A11. See compareMooringNumbers for the prefix/index split.
  const rows = await db
    .select({
      id: berths.id,
      mooringNumber: berths.mooringNumber,
      area: berths.area,
      status: berths.status,
    })
    .from(berths)
    .where(eq(berths.portId, portId));
  return sortByMooring(rows, (r) => r.mooringNumber);
}
