import { NextResponse } from 'next/server';
import { z } from 'zod';
import { eq, and } from 'drizzle-orm';

import { withAuth } from '@/lib/api/helpers';
import { parseBody } from '@/lib/api/route-helpers';
import { runBulk } from '@/lib/api/bulk-helpers';
import { db } from '@/lib/db';
import { clients, clientTags } from '@/lib/db/schema/clients';
import { setClientTags } from '@/lib/services/clients.service';
import {
  getClientArchiveDossier,
  type ClientArchiveDossier,
} from '@/lib/services/client-archive-dossier.service';
import {
  archiveClientWithDecisions,
  type ArchiveResult,
} from '@/lib/services/client-archive.service';
import { notifyNextInLine } from '@/lib/services/next-in-line-notify.service';
import { getQueue } from '@/lib/queue';
import { logger } from '@/lib/logger';
import { errorResponse } from '@/lib/errors';

const bulkSchema = z.discriminatedUnion('action', [
  z.object({
    action: z.literal('archive'),
    ids: z.array(z.string().min(1)).min(1).max(100),
    /** When provided, lifts the high-stakes block on listed clients
     *  individually. The bulk-archive wizard collects these from the
     *  operator one client at a time. Reasons must be ≥5 characters. */
    reasonsByClientId: z.record(z.string(), z.string().min(5).max(2000)).optional(),
  }),
  z.object({
    action: z.literal('add_tag'),
    ids: z.array(z.string().min(1)).min(1).max(100),
    tagId: z.string().min(1),
  }),
  z.object({
    action: z.literal('remove_tag'),
    ids: z.array(z.string().min(1)).min(1).max(100),
    tagId: z.string().min(1),
  }),
]);

const PERMISSION_BY_ACTION = {
  archive: 'delete' as const,
  add_tag: 'edit' as const,
  remove_tag: 'edit' as const,
};

export const POST = withAuth(async (req, ctx) => {
  let body: z.infer<typeof bulkSchema>;
  try {
    body = await parseBody(req, bulkSchema);
  } catch (error) {
    return errorResponse(error);
  }

  const allowed = ctx.isSuperAdmin
    ? true
    : !!ctx.permissions?.clients?.[PERMISSION_BY_ACTION[body.action]];
  if (!allowed) return NextResponse.json({ error: 'Forbidden' }, { status: 403 });

  const meta = {
    userId: ctx.userId,
    portId: ctx.portId,
    ipAddress: ctx.ipAddress,
    userAgent: ctx.userAgent,
  };

  const reasonsByClientId = body.action === 'archive' ? (body.reasonsByClientId ?? {}) : {};

  // Collect per-archive side-effects so we can fan out Documenso voids
  // + next-in-line notifications AFTER the bulk loop completes (mirrors
  // the single-client route's post-commit behaviour). Without this the
  // bulk path silently dropped both side-effect streams (audit R2-C1).
  const archiveSideEffects: Array<{
    dossier: ClientArchiveDossier;
    result: ArchiveResult;
  }> = [];

  const { results, summary } = await runBulk(body.ids, async (id) => {
    if (body.action === 'archive') {
      // Bulk archive uses the smart-archive backend with sensible
      // low-stakes defaults: release available/under-offer berths,
      // retain sold ones, cancel active reservations, leave invoices,
      // leave Documenso envelopes pending. High-stakes clients require
      // a per-client reason supplied via reasonsByClientId; the bulk-
      // archive wizard captures these one at a time before submitting.
      const dossier = await getClientArchiveDossier(id, ctx.portId);
      // Idempotent: if a previous request already archived this client
      // (e.g. a network retry / double-click), treat it as success
      // rather than letting `archiveClientWithDecisions` throw a
      // ConflictError that runBulk will surface as a per-row failure.
      if (dossier.client.archivedAt) {
        return;
      }
      const perClientReason = reasonsByClientId[id];
      if (dossier.stakeLevel === 'high' && !perClientReason) {
        throw new Error(
          `Client at ${dossier.highStakesStage} requires a per-client reason; supply one in reasonsByClientId.`,
        );
      }
      if (dossier.blockers.length > 0) {
        throw new Error(`Cannot archive: ${dossier.blockers[0]}`);
      }
      const hasSignedDocs = dossier.documents.some(
        (d) => d.status === 'completed' || d.status === 'signed',
      );
      const reason = perClientReason ?? 'Bulk archive (low-stakes auto-mode)';
      // Pick the berth's first linked interest from the dossier
      // (authoritative interest_berths join). Berths with no linked
      // interest for this client are dropped - emitting an empty
      // interestId causes the delete to silently match zero rows
      // (audit R2-H3).
      const berthDecisions = dossier.berths
        .map((b) => {
          const interestId = b.linkedInterestIds[0];
          if (!interestId) return null;
          return {
            berthId: b.berthId,
            interestId,
            action: b.status === 'sold' ? ('retain' as const) : ('release' as const),
          };
        })
        .filter(
          (x): x is { berthId: string; interestId: string; action: 'retain' | 'release' } =>
            x !== null,
        );

      const result = await archiveClientWithDecisions({
        dossier,
        decisions: {
          reason,
          acknowledgedSignedDocuments: hasSignedDocs,
          berthDecisions,
          yachtDecisions: dossier.yachts.map((y) => ({ yachtId: y.yachtId, action: 'retain' })),
          tenancyDecisions: dossier.tenancies.map((r) => ({
            tenancyId: r.tenancyId,
            action: 'cancel',
          })),
          invoiceDecisions: dossier.invoices.map((i) => ({
            invoiceId: i.invoiceId,
            action: 'leave',
          })),
          documentDecisions: dossier.documents.map((d) => ({
            documentId: d.documentId,
            action: 'leave',
          })),
        },
        meta,
      });
      archiveSideEffects.push({ dossier, result });
      return;
    }
    const client = await db.query.clients.findFirst({
      where: and(eq(clients.id, id), eq(clients.portId, ctx.portId)),
    });
    if (!client) throw new Error('Client not found');
    const existing = await db
      .select({ tagId: clientTags.tagId })
      .from(clientTags)
      .where(eq(clientTags.clientId, id));
    const current = new Set(existing.map((t) => t.tagId));
    if (body.action === 'add_tag') current.add(body.tagId);
    else current.delete(body.tagId);
    await setClientTags(id, ctx.portId, Array.from(current), meta);
  });

  // Post-commit side-effects, identical pattern to the single-client
  // route at /api/v1/clients/[id]/archive. Documenso voids → BullMQ
  // documents queue; next-in-line notifications fire-and-forget per
  // released berth.
  if (archiveSideEffects.length > 0) {
    const queue = getQueue('documents');
    for (const { dossier, result } of archiveSideEffects) {
      for (const c of result.externalCleanups) {
        if (c.kind === 'documenso_void') {
          await queue
            .add('documenso-void', {
              documentId: c.documentId,
              documensoId: c.documensoId,
              portId: ctx.portId,
            })
            .catch((err) =>
              logger.error(
                { err, documentId: c.documentId, clientId: result.clientId },
                'Bulk archive: failed to enqueue Documenso void',
              ),
            );
        }
      }

      for (const released of result.releasedBerths) {
        if (released.nextInLineInterestIds.length === 0) continue;
        const otherInterests =
          dossier.berths
            .find((b) => b.berthId === released.berthId)
            ?.otherInterests.map((o) => ({
              interestId: o.interestId,
              clientName: o.clientName,
              pipelineStage: o.pipelineStage,
            })) ?? [];
        void notifyNextInLine({
          portId: ctx.portId,
          berthId: released.berthId,
          mooringNumber: released.mooringNumber,
          archivedClientName: dossier.client.fullName,
          nextInLineInterests: otherInterests,
        }).catch((err) =>
          logger.error(
            { err, berthId: released.berthId, clientId: result.clientId },
            'Bulk archive: failed to fire next-in-line notification',
          ),
        );
      }
    }
  }

  return NextResponse.json({ data: { results, summary } });
});