import { readFileSync } from 'fs';
import { join } from 'path';
import { describe, expect, it, vi } from 'vitest';
import { TenderIngestionService } from './tender-ingestion.service';

/**
 * TenderIngestionService.spec — day-cursor gate, fan-out over active
 * sources (SCHEMA-03, D-01), dedupActive gate (D-05), and D-07 delta-only
 * matching (Plan 10-04 Task 1, extended Plan 13-03 Task 2).
 *
 * A minimal in-memory fake PrismaService (Maps for tenderSourcePollConfig
 * and tender) is used, matching this repo's established test convention of
 * hand-rolled prisma-shaped mocks rather than a real DB connection (see
 * ldap.service.spec.ts). The registry/adapter/normalizer/dedup collaborators
 * are also plain fakes.
 *
 * SCHEMA-02 change-detection is now exercised through a fake `dedup.resolve`
 * that mimics TenderDedupService's real behavior (upsert-by-dedupKey, report
 * created-vs-updated) — this proves pollDueSources still wires contentHash-
 * driven updates through correctly after the resolve() hand-off, without
 * re-testing TenderDedupService's own tier logic (covered by
 * tender-dedup.service.spec.ts).
 */

function berlinTodayStr(): string {
  return new Date().toLocaleDateString('en-CA', { timeZone: 'Europe/Berlin' });
}

/** Day string, offset from Berlin-today by `offsetDays` (negative = past). */
function dayString(offsetDays: number): string {
  const base = new Date(`${berlinTodayStr()}T00:00:00Z`);
  base.setUTCDate(base.getUTCDate() + offsetDays);
  return base.toISOString().slice(0, 10);
}

/** UTC-midnight Date for the given day offset — day-granularity, no time-of-day drift. */
function dayDate(offsetDays: number): Date {
  return new Date(`${dayString(offsetDays)}T00:00:00Z`);
}

function makeFakePrisma(configSeeds: Record<string, any> = {}) {
  const tenders = new Map<string, any>();
  const configs = new Map<string, any>();
  for (const [sourceType, seed] of Object.entries(configSeeds)) {
    configs.set(sourceType, {
      id: `cfg-${sourceType}`,
      sourceType,
      pollIntervalMin: 60,
      isActive: true,
      lastIngestedDay: null as Date | null,
      ...seed,
    });
  }

  const prisma = {
    tenderSourcePollConfig: {
      findMany: vi.fn(async ({ where }: any) => {
        const all = [...configs.values()];
        if (where?.isActive === undefined) return all;
        return all.filter((c) => c.isActive === where.isActive);
      }),
      update: vi.fn(async ({ where, data }: any) => {
        const existing = configs.get(where.sourceType);
        const updated = { ...existing, ...data };
        configs.set(where.sourceType, updated);
        return updated;
      }),
    },
    tender: {
      updateMany: vi.fn(async ({ where, data }: any) => {
        let count = 0;
        for (const [key, row] of tenders) {
          if (
            row.status === where.status &&
            row.deadlineAt instanceof Date &&
            where.deadlineAt?.lt &&
            row.deadlineAt < where.deadlineAt.lt
          ) {
            tenders.set(key, { ...row, ...data });
            count++;
          }
        }
        return { count };
      }),
      deleteMany: vi.fn(async ({ where }: any) => {
        let count = 0;
        for (const [key, row] of tenders) {
          if (
            row.status === where.status &&
            row.deadlineAt instanceof Date &&
            where.deadlineAt?.lt &&
            row.deadlineAt < where.deadlineAt.lt
          ) {
            tenders.delete(key);
            count++;
          }
        }
        return { count };
      }),
    },
    __store: { tenders, configs },
  };

  return prisma;
}

const BASE_RECORD = {
  sourcePortal: 'doe-opendata',
  sourceNoticeId: 'notice-1',
  ocid: 'ocds-1',
  dedupKey: 'ocds-1',
  title: 'Test-Ausschreibung',
  buyerName: 'Stadt Testhausen',
  cpvCodes: [] as string[],
  cpvDivisions: [] as string[],
  region: null as string | null,
  plz: null as string | null,
  bundesland: null as string | null,
  deadlineAt: null as Date | null,
  estimatedValue: null as number | null,
  procedureType: null as string | null,
  status: 'active',
  sourceUrl: null as string | null,
  contentHash: 'hash-1',
  publishedAt: new Date(),
};

/**
 * Fake TenderDedupService.resolve() — upserts by dedupKey into the shared
 * `tenders` store and reports created-vs-updated, mirroring the real
 * service's contract without re-implementing its three-tier match logic.
 */
function makeFakeDedup(tenders: Map<string, any>) {
  return {
    resolve: vi.fn(async (n: any, _opts: { dedupActive: boolean }) => {
      const existing = tenders.get(n.dedupKey);
      if (existing) {
        Object.assign(existing, {
          title: n.title,
          deadlineAt: n.deadlineAt,
          contentHash: n.contentHash,
        });
        return { tenderId: existing.id, created: false };
      }
      const created = { id: `id-${tenders.size + 1}`, ...n };
      tenders.set(n.dedupKey, created);
      return { tenderId: created.id, created: true };
    }),
  };
}

function makeFakeRegistry(adapters: Record<string, any>) {
  return {
    get: vi.fn((sourceType: string) => adapters[sourceType]),
  };
}

function makeService(
  prisma: any,
  registry: any,
  normalizer: any,
  matching: any = { matchDelta: vi.fn() },
  dedup: any = makeFakeDedup(prisma.__store.tenders),
) {
  const service = new TenderIngestionService(prisma, registry, normalizer, matching, dedup);
  // Override the polite catch-up delay so tests don't sleep for real.
  (service as any).politeDelayMs = 0;
  return service;
}

describe('TenderIngestionService.pollDueSources — day-cursor gate (Pitfall A)', () => {
  it('makes NO adapter call when the day-cursor is not strictly before Berlin-today (no-op tick, expected)', async () => {
    const prisma = makeFakePrisma({ 'doe-opendata': { lastIngestedDay: dayDate(-1) } }); // -> next day is today, gated out
    const doeAdapter = { fetchTenders: vi.fn() };
    const registry = makeFakeRegistry({ 'doe-opendata': doeAdapter });
    const normalizer = { normalize: vi.fn() };
    const service = makeService(prisma, registry, normalizer);

    await service.pollDueSources();

    expect(doeAdapter.fetchTenders).not.toHaveBeenCalled();
  });

  it('does nothing when there are no active configs at all', async () => {
    const prisma = makeFakePrisma({ 'doe-opendata': { isActive: false, lastIngestedDay: dayDate(-3) } });
    const doeAdapter = { fetchTenders: vi.fn() };
    const registry = makeFakeRegistry({ 'doe-opendata': doeAdapter });
    const normalizer = { normalize: vi.fn() };
    const service = makeService(prisma, registry, normalizer);

    await service.pollDueSources();

    expect(doeAdapter.fetchTenders).not.toHaveBeenCalled();
  });
});

describe('TenderIngestionService.pollDueSources — SCHEMA-02 change detection (via resolve())', () => {
  it('inserts a fresh notice, and does NOT duplicate when the identical notice (same dedupKey/contentHash) reappears the next catch-up day', async () => {
    const prisma = makeFakePrisma({ 'doe-opendata': { lastIngestedDay: dayDate(-3) } });
    const record = { ...BASE_RECORD };
    const doeAdapter = { fetchTenders: vi.fn().mockResolvedValue([record]) };
    const registry = makeFakeRegistry({ 'doe-opendata': doeAdapter });
    const normalizer = { normalize: vi.fn((raw: any) => raw) };
    const service = makeService(prisma, registry, normalizer);

    await service.pollDueSources();

    // Catch-up loop covers 2 days (today-2, today-1) — same record both days.
    expect(doeAdapter.fetchTenders).toHaveBeenCalledTimes(2);
    expect(prisma.__store.tenders.size).toBe(1);
    expect(prisma.__store.tenders.get('ocds-1').contentHash).toBe('hash-1');
  });

  it('updates the existing row in place when the same dedupKey reappears with a changed contentHash (extended deadline) — SCHEMA-02 preserved through resolve()', async () => {
    const prisma = makeFakePrisma({ 'doe-opendata': { lastIngestedDay: dayDate(-3) } });
    const day1Record = {
      ...BASE_RECORD,
      contentHash: 'hash-1',
      deadlineAt: new Date('2026-08-01T10:00:00Z'),
    };
    const day2Record = {
      ...BASE_RECORD,
      contentHash: 'hash-2',
      deadlineAt: new Date('2026-08-15T10:00:00Z'),
    };
    const doeAdapter = {
      fetchTenders: vi.fn().mockResolvedValueOnce([day1Record]).mockResolvedValueOnce([day2Record]),
    };
    const registry = makeFakeRegistry({ 'doe-opendata': doeAdapter });
    const normalizer = { normalize: vi.fn((raw: any) => raw) };
    const service = makeService(prisma, registry, normalizer);

    await service.pollDueSources();

    expect(prisma.__store.tenders.size).toBe(1); // updated in place, no duplicate row
    const row = prisma.__store.tenders.get('ocds-1');
    expect(row.contentHash).toBe('hash-2');
    expect(row.deadlineAt).toEqual(new Date('2026-08-15T10:00:00Z'));
  });
});

describe('TenderIngestionService.pollDueSources — fan-out over multiple active sources (SCHEMA-03)', () => {
  it('polls every active config, resolving each source through its own registered adapter', async () => {
    const prisma = makeFakePrisma({
      'doe-opendata': { lastIngestedDay: dayDate(-2) },
      'ai-netserver': { lastIngestedDay: dayDate(-2) },
    });
    const doeAdapter = {
      fetchTenders: vi.fn().mockResolvedValue([{ ...BASE_RECORD, dedupKey: 'doe-1', ocid: 'doe-1' }]),
    };
    const netserverAdapter = {
      fetchTenders: vi.fn().mockResolvedValue([
        { ...BASE_RECORD, sourcePortal: 'ai-netserver', sourceNoticeId: 'ns-1', ocid: null, dedupKey: 'ai-netserver:ns-1' },
      ]),
    };
    const registry = makeFakeRegistry({ 'doe-opendata': doeAdapter, 'ai-netserver': netserverAdapter });
    const normalizer = { normalize: vi.fn((raw: any) => raw) };
    const service = makeService(prisma, registry, normalizer);

    await service.pollDueSources();

    expect(doeAdapter.fetchTenders).toHaveBeenCalled();
    expect(netserverAdapter.fetchTenders).toHaveBeenCalled();
    expect(prisma.__store.tenders.size).toBe(2);
  });

  it('skips a config whose sourceType has no registered adapter, without throwing', async () => {
    const prisma = makeFakePrisma({ 'cosinex-dtvp': { lastIngestedDay: dayDate(-2) } });
    const registry = makeFakeRegistry({}); // nothing registered
    const normalizer = { normalize: vi.fn() };
    const service = makeService(prisma, registry, normalizer);

    await expect(service.pollDueSources()).resolves.toBeUndefined();
    expect(prisma.__store.tenders.size).toBe(0);
  });
});

describe('TenderIngestionService.pollDueSources — catch-per-source error isolation (D-01)', () => {
  it('a throwing source does not prevent another active source from being polled, and the tick itself does not throw', async () => {
    const prisma = makeFakePrisma({
      'doe-opendata': { lastIngestedDay: dayDate(-2) },
      'ai-netserver': { lastIngestedDay: dayDate(-2) },
    });
    const brokenAdapter = { fetchTenders: vi.fn().mockRejectedValue(new Error('portal down')) };
    const healthyAdapter = {
      fetchTenders: vi.fn().mockResolvedValue([
        { ...BASE_RECORD, sourcePortal: 'ai-netserver', sourceNoticeId: 'ns-1', ocid: null, dedupKey: 'ai-netserver:ns-1' },
      ]),
    };
    const registry = makeFakeRegistry({ 'doe-opendata': brokenAdapter, 'ai-netserver': healthyAdapter });
    const normalizer = { normalize: vi.fn((raw: any) => raw) };
    const service = makeService(prisma, registry, normalizer);

    await expect(service.pollDueSources()).resolves.toBeUndefined();

    expect(brokenAdapter.fetchTenders).toHaveBeenCalled();
    expect(healthyAdapter.fetchTenders).toHaveBeenCalled();
    expect(prisma.__store.tenders.size).toBe(1); // only the healthy source's tender landed
  });
});

describe("TenderIngestionService.pollDueSources — pollGranularity 'tick' gate (D-15, Phase 14 Plan 02)", () => {
  it("fetches a pollGranularity='tick' source on every tick, while a 'day' source with today's next-day gated-out lastIngestedDay is skipped in the SAME tick", async () => {
    const prisma = makeFakePrisma({
      'doe-opendata': { lastIngestedDay: dayDate(-1) }, // -> next day is today, gated out ('day' path unchanged)
      rss: { pollGranularity: 'tick', lastIngestedDay: null }, // 'tick' — no day-cursor gate at all
    });
    const doeAdapter = { fetchTenders: vi.fn() };
    const rssAdapter = {
      fetchTenders: vi.fn().mockResolvedValue([
        { ...BASE_RECORD, sourcePortal: 'rss', sourceNoticeId: 'rss-1', ocid: null, dedupKey: 'rss:rss-1' },
      ]),
    };
    const registry = makeFakeRegistry({ 'doe-opendata': doeAdapter, rss: rssAdapter });
    const normalizer = { normalize: vi.fn((raw: any) => raw) };
    const service = makeService(prisma, registry, normalizer);

    await service.pollDueSources();

    expect(doeAdapter.fetchTenders).not.toHaveBeenCalled(); // 'day' gate unchanged
    expect(rssAdapter.fetchTenders).toHaveBeenCalledTimes(1); // 'tick' — fetched regardless
    expect(prisma.__store.tenders.size).toBe(1);
  });

  it("does NOT advance or read lastIngestedDay for a 'tick' source — it is fetched again next tick even with lastIngestedDay already set to today", async () => {
    const prisma = makeFakePrisma({
      rss: { pollGranularity: 'tick', lastIngestedDay: dayDate(0) }, // today — would gate a 'day' source out entirely
    });
    const rssAdapter = { fetchTenders: vi.fn().mockResolvedValue([]) };
    const registry = makeFakeRegistry({ rss: rssAdapter });
    const normalizer = { normalize: vi.fn() };
    const service = makeService(prisma, registry, normalizer);

    await service.pollDueSources();
    await service.pollDueSources();

    expect(rssAdapter.fetchTenders).toHaveBeenCalledTimes(2);
    // lastIngestedDay is never touched by the 'tick' path.
    expect(prisma.__store.configs.get('rss').lastIngestedDay).toEqual(dayDate(0));
  });

  it("passes berlinToday (not a day-cursor loop) as the single argument to a 'tick' adapter's fetchTenders", async () => {
    const prisma = makeFakePrisma({ rss: { pollGranularity: 'tick' } });
    const rssAdapter = { fetchTenders: vi.fn().mockResolvedValue([]) };
    const registry = makeFakeRegistry({ rss: rssAdapter });
    const normalizer = { normalize: vi.fn() };
    const service = makeService(prisma, registry, normalizer);

    await service.pollDueSources();

    expect(rssAdapter.fetchTenders).toHaveBeenCalledWith(berlinTodayStr());
  });
});

describe('TenderIngestionService.pollDueSources — dedupActive gate (D-05)', () => {
  it('passes dedupActive=false to resolve() when exactly one config is active', async () => {
    const prisma = makeFakePrisma({ 'doe-opendata': { lastIngestedDay: dayDate(-2) } });
    const doeAdapter = { fetchTenders: vi.fn().mockResolvedValue([{ ...BASE_RECORD }]) };
    const registry = makeFakeRegistry({ 'doe-opendata': doeAdapter });
    const normalizer = { normalize: vi.fn((raw: any) => raw) };
    const dedup = makeFakeDedup(prisma.__store.tenders);
    const service = makeService(prisma, registry, normalizer, undefined, dedup);

    await service.pollDueSources();

    expect(dedup.resolve).toHaveBeenCalledWith(expect.anything(), { dedupActive: false });
  });

  it('passes dedupActive=true to resolve() when two or more configs are active', async () => {
    const prisma = makeFakePrisma({
      'doe-opendata': { lastIngestedDay: dayDate(-2) },
      'ai-netserver': { lastIngestedDay: dayDate(-2) },
    });
    const doeAdapter = { fetchTenders: vi.fn().mockResolvedValue([{ ...BASE_RECORD, dedupKey: 'doe-1', ocid: 'doe-1' }]) };
    const netserverAdapter = {
      fetchTenders: vi.fn().mockResolvedValue([
        { ...BASE_RECORD, sourcePortal: 'ai-netserver', sourceNoticeId: 'ns-1', ocid: null, dedupKey: 'ai-netserver:ns-1' },
      ]),
    };
    const registry = makeFakeRegistry({ 'doe-opendata': doeAdapter, 'ai-netserver': netserverAdapter });
    const normalizer = { normalize: vi.fn((raw: any) => raw) };
    const dedup = makeFakeDedup(prisma.__store.tenders);
    const service = makeService(prisma, registry, normalizer, undefined, dedup);

    await service.pollDueSources();

    expect(dedup.resolve).toHaveBeenCalledWith(expect.anything(), { dedupActive: true });
  });
});

describe('TenderIngestionService.pollDueSources — delta-only matching (Plan 12-01, D-07)', () => {
  it('calls matching.matchDelta with ONLY the genuinely-new tender IDs of this tick — a pre-existing record reappearing (even with a changed contentHash) is excluded', async () => {
    const prisma = makeFakePrisma({ 'doe-opendata': { lastIngestedDay: dayDate(-2) } });
    // Pre-seed one tender that already exists BEFORE this tick — simulates
    // a previously-ingested row that reappears in this tick's fetch.
    prisma.__store.tenders.set('existing-notice', {
      id: 'id-existing',
      dedupKey: 'existing-notice',
      contentHash: 'old-hash',
      status: 'active',
    });

    const existingRecord = {
      ...BASE_RECORD,
      dedupKey: 'existing-notice',
      contentHash: 'updated-hash', // changed, but NOT genuinely new
    };
    const newRecord1 = { ...BASE_RECORD, dedupKey: 'new-notice-1' };
    const newRecord2 = { ...BASE_RECORD, dedupKey: 'new-notice-2' };

    const doeAdapter = {
      fetchTenders: vi.fn().mockResolvedValue([existingRecord, newRecord1, newRecord2]),
    };
    const registry = makeFakeRegistry({ 'doe-opendata': doeAdapter });
    const normalizer = { normalize: vi.fn((raw: any) => raw) };
    const matching = { matchDelta: vi.fn() };
    const service = makeService(prisma, registry, normalizer, matching);

    await service.pollDueSources();

    expect(matching.matchDelta).toHaveBeenCalledTimes(1);
    const calledIds: string[] = matching.matchDelta.mock.calls[0][0];
    const newIds = [
      prisma.__store.tenders.get('new-notice-1').id,
      prisma.__store.tenders.get('new-notice-2').id,
    ];
    expect(calledIds.sort()).toEqual(newIds.sort());
    expect(calledIds).not.toContain('id-existing');
  });

  it('does NOT call matchDelta when the tick yields zero genuinely-new tenders', async () => {
    const prisma = makeFakePrisma({ 'doe-opendata': { lastIngestedDay: dayDate(-2) } });
    prisma.__store.tenders.set('existing-notice', {
      id: 'id-existing',
      dedupKey: 'existing-notice',
      contentHash: 'old-hash',
      status: 'active',
    });

    const existingRecord = { ...BASE_RECORD, dedupKey: 'existing-notice' };
    const doeAdapter = { fetchTenders: vi.fn().mockResolvedValue([existingRecord]) };
    const registry = makeFakeRegistry({ 'doe-opendata': doeAdapter });
    const normalizer = { normalize: vi.fn((raw: any) => raw) };
    const matching = { matchDelta: vi.fn() };
    const service = makeService(prisma, registry, normalizer, matching);

    await service.pollDueSources();

    expect(matching.matchDelta).not.toHaveBeenCalled();
  });
});

describe('TenderIngestionService.pollDueSources — catch-up cursor advance', () => {
  it('advances lastIngestedDay by one day per successful fetch, looping from lastIngestedDay+1 up to today-1', async () => {
    const prisma = makeFakePrisma({ 'doe-opendata': { lastIngestedDay: dayDate(-3) } });
    const doeAdapter = { fetchTenders: vi.fn().mockResolvedValue([]) };
    const registry = makeFakeRegistry({ 'doe-opendata': doeAdapter });
    const normalizer = { normalize: vi.fn() };
    const service = makeService(prisma, registry, normalizer);

    await service.pollDueSources();

    const calledDays = doeAdapter.fetchTenders.mock.calls.map((c: any[]) => c[0]);
    expect(calledDays).toEqual([dayString(-2), dayString(-1)]);

    const finalConfig = prisma.__store.configs.get('doe-opendata');
    expect(finalConfig.lastIngestedDay.toISOString().slice(0, 10)).toBe(dayString(-1));
  });
});

describe('TenderIngestionService.pruneExpiredTenders — D-05 retention', () => {
  it('marks past-deadline active rows expired, deletes expired rows older than 90 days, and never touches null-deadline rows', async () => {
    const prisma = makeFakePrisma();
    prisma.__store.tenders.set('t-active-past-deadline', {
      dedupKey: 't-active-past-deadline',
      status: 'active',
      deadlineAt: dayDate(-1),
    });
    prisma.__store.tenders.set('t-expired-old', {
      dedupKey: 't-expired-old',
      status: 'expired',
      deadlineAt: dayDate(-91),
    });
    prisma.__store.tenders.set('t-expired-recent', {
      dedupKey: 't-expired-recent',
      status: 'expired',
      deadlineAt: dayDate(-30),
    });
    prisma.__store.tenders.set('t-null-deadline', {
      dedupKey: 't-null-deadline',
      status: 'active',
      deadlineAt: null,
    });
    prisma.__store.tenders.set('t-active-future', {
      dedupKey: 't-active-future',
      status: 'active',
      deadlineAt: dayDate(1),
    });

    const registry = makeFakeRegistry({});
    const service = makeService(prisma, registry, { normalize: vi.fn() });

    await service.pruneExpiredTenders();

    expect(prisma.__store.tenders.get('t-active-past-deadline').status).toBe('expired');
    expect(prisma.__store.tenders.has('t-expired-old')).toBe(false);
    expect(prisma.__store.tenders.get('t-expired-recent').status).toBe('expired');
    expect(prisma.__store.tenders.get('t-null-deadline').status).toBe('active');
    expect(prisma.__store.tenders.get('t-active-future').status).toBe('active');
  });
});

describe('TenderIngestionService — multi-tenant safety invariant (D-03)', () => {
  it('never calls forTenant() — uses the plain global PrismaService on Tender/TenderSourcePollConfig', () => {
    const source = readFileSync(join(__dirname, 'tender-ingestion.service.ts'), 'utf8');
    expect(source).not.toMatch(/forTenant/);
  });
});