import { readFileSync } from 'node:fs';
import { join } from 'node:path';
import { describe, expect, it, vi } from 'vitest';
import { ModuleRegistryService } from '../module-registry/module-registry.service';
import { TenderSchedulerService } from './tender-scheduler.service';

/**
 * TenderSchedulerService.spec — the phase's headline acceptance criterion
 * (Success Criteria 4 & 5, INGEST-06, T-10-10): proves the ABSENCE of
 * tenant-count-scaled behavior, not correct per-tenant iteration (there are
 * no per-tenant DÖE configs to iterate — the config is a genuine
 * platform-wide singleton, RESEARCH.md Pitfall D).
 *
 * Uses the same hand-rolled prisma-shaped fake convention as
 * tender-ingestion.service.spec.ts / ldap.service.spec.ts, driving the REAL
 * ModuleRegistryService (unmocked) so the activation call path is genuine,
 * not a stand-in.
 *
 * forTenant() just returns the same client in these tests (identical
 * convention to ldap.service.spec.ts) — tenant scoping/RLS binding is not
 * what this file tests, only ModuleRegistryService.activateForTenant's
 * poll-once-fan-out-many behavior. Needed since 260910-exd (Aufgabe 3)
 * converted ModuleRegistryService.activateForTenant to forTenant(), and the
 * hand-rolled fake below does not implement `$extends`.
 */
vi.mock('../prisma/prisma-tenant.extension', () => ({
  forTenant: vi.fn((p: unknown) => p),
}));

function makeFakePrisma() {
  const modules = new Map<string, any>();
  modules.set('mod-1', {
    id: 'mod-1',
    slug: 'tender-radar',
    name: 'Ausschreibungs-Radar',
  });
  const activations = new Map<string, any>();
  const tenders: unknown[] = [];
  const configs = new Map<string, any>();
  configs.set('doe-opendata', {
    id: 'cfg1',
    sourceType: 'doe-opendata',
    pollIntervalMin: 60,
    isActive: true,
    lastIngestedDay: null,
  });

  return {
    module: {
      findUnique: vi.fn(async ({ where }: any) => {
        if (where.id) return modules.get(where.id) ?? null;
        if (where.slug) {
          return Array.from(modules.values()).find((m) => m.slug === where.slug) ?? null;
        }
        return null;
      }),
    },
    tenantModuleActivation: {
      upsert: vi.fn(async ({ where, create, update }: any) => {
        const key = `${where.tenantId_moduleId.tenantId}:${where.tenantId_moduleId.moduleId}`;
        const existing = activations.get(key);
        const record = existing ? { ...existing, ...update } : { ...create };
        activations.set(key, record);
        return { ...record, module: modules.get(record.moduleId) };
      }),
    },
    tenderSourcePollConfig: {
      findUnique: vi.fn(async ({ where }: any) => configs.get(where.sourceType) ?? null),
    },
    tender: {
      count: vi.fn(async () => tenders.length),
    },
    __store: { modules, activations, tenders, configs },
  };
}

describe('TenderSchedulerService — poll-once-fan-out-many (INGEST-06, Success Criteria 4 & 5)', () => {
  it('activating the module for a 2nd tenant triggers zero additional DÖE calls, zero additional cron jobs, and zero additional Tender rows', async () => {
    const prisma = makeFakePrisma();

    const addCronJob = vi.fn();
    const getCronJob = vi.fn(() => {
      throw new Error('not registered');
    });
    const deleteCronJob = vi.fn();
    const schedulerRegistry = { addCronJob, getCronJob, deleteCronJob } as any;

    const pollDueSources = vi.fn().mockResolvedValue(undefined);
    const tenderIngestionService = { pollDueSources } as any;

    const scheduler = new TenderSchedulerService(
      schedulerRegistry,
      tenderIngestionService,
      prisma as any,
    );
    const moduleRegistryService = new ModuleRegistryService(prisma as any);

    // Platform boot: the scheduler initializes exactly once, independent of
    // any tenant — this is the one and only cron-job registration.
    await scheduler.onApplicationBootstrap();
    expect(addCronJob).toHaveBeenCalledTimes(1);
    expect(addCronJob.mock.calls[0][0]).toBe('tender-doe-poll');

    // Tenant A activates the tender-radar module.
    await moduleRegistryService.activateForTenant('tenant-a', 'mod-1');

    expect(addCronJob).toHaveBeenCalledTimes(1); // still just the one global job
    expect(pollDueSources).not.toHaveBeenCalled(); // activation never triggers a poll
    expect(await prisma.tender.count()).toBe(0);

    // Tenant B activates the SAME module — the headline acceptance criterion.
    await moduleRegistryService.activateForTenant('tenant-b', 'mod-1');

    expect(addCronJob).toHaveBeenCalledTimes(1); // zero additional cron jobs
    expect(pollDueSources).not.toHaveBeenCalled(); // zero additional DÖE HTTP calls
    expect(await prisma.tender.count()).toBe(0); // zero additional Tender rows

    // Absence, not presence: no per-tenant iteration ever happened.
    expect(prisma.__store.activations.size).toBe(2); // both tenants recorded their own activation row
    expect(prisma.tenderSourcePollConfig.findUnique).toHaveBeenCalledTimes(1); // only the scheduler's own init call
  });

  it('registers a single global job with setInterval() taking no tenant parameter', () => {
    const prisma = makeFakePrisma();
    const addCronJob = vi.fn();
    const getCronJob = vi.fn(() => {
      throw new Error('not registered');
    });
    const schedulerRegistry = { addCronJob, getCronJob, deleteCronJob: vi.fn() } as any;
    const tenderIngestionService = { pollDueSources: vi.fn() } as any;

    const scheduler = new TenderSchedulerService(
      schedulerRegistry,
      tenderIngestionService,
      prisma as any,
    );

    scheduler.setInterval(60);

    expect(addCronJob).toHaveBeenCalledTimes(1);
    expect(addCronJob.mock.calls[0][0]).toBe('tender-doe-poll');
    // setInterval's only parameter is the interval — no tenant id anywhere in its signature.
    expect(TenderSchedulerService.prototype.setInterval.length).toBe(1);
  });

  it('has no activeTenantId field and never falls back to findFirst() — poll-once-fan-out-many invariant', () => {
    const source = readFileSync(join(__dirname, 'tender-scheduler.service.ts'), 'utf8');
    expect(source).not.toMatch(/activeTenantId/);
    expect(source).not.toMatch(/findFirst/);
    expect(source).toMatch(/findUnique/);
  });

  it('registers the cron via onApplicationBootstrap (NOT onModuleInit) so the poll-config seed runs first on a fresh DB (#prod-bootstrap)', () => {
    // Regression guard: TendersModule.onModuleInit seeds the doe-opendata
    // poll config. onModuleInit hooks run in an unspecified order relative to
    // one another, so on a FRESH database the scheduler must NOT read the
    // config in its own onModuleInit — it would see the config absent and
    // never register the single global cron that drives DÖE + RSS + email-alert
    // ingestion (observed live on a fresh prod DB: 0 tenders, cron unregistered).
    // onApplicationBootstrap runs after every module's onModuleInit → seed done.
    const source = readFileSync(join(__dirname, 'tender-scheduler.service.ts'), 'utf8');
    expect(source).toMatch(/implements OnApplicationBootstrap/);
    expect(source).toMatch(/async onApplicationBootstrap\(/);
    expect(source).not.toMatch(/async onModuleInit\(/);
    // The lifecycle method actually exists on the instance.
    expect(typeof TenderSchedulerService.prototype.onApplicationBootstrap).toBe(
      'function',
    );
  });
});