import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import type { Injector } from 'graphql-modules';
import { DocumentType } from '../../../shared/enums.js';
import { AnthropicProvider } from '../../app-providers/anthropic.js';
import { EmailIngestionIngestProvider } from '../providers/email-ingestion-ingest.provider.js';
import { EmailIngestionControlProvider } from '../providers/email-ingestion-control.provider.js';
import { IngestOutcome, IngestReasonCode } from '../contracts.js';

// ---------------------------------------------------------------------------
// Fixtures
// ---------------------------------------------------------------------------

const NOW = new Date('2026-06-11T12:00:00.000Z');
const FUTURE = new Date(NOW.getTime() + 5 * 60 * 1000);

const TENANT_ID = 'tenant-uuid-a';
const JTI = 'jti-uuid';
const IDEM_KEY = 'idem-key-001';
const MSG_ID = 'msg-abc-123';
const MSG_HASH = 'sha256-abc';
const CORR_ID = 'corr-001';

const BUSINESS_ID = 'business-uuid-x';

const VALID_GRANT = {
  valid: true as const,
  grant: { jti: JTI, tenantId: TENANT_ID, action: 'ingest', expiresAt: FUTURE, businessId: null },
};

const VALID_GRANT_WITH_BUSINESS = {
  valid: true as const,
  grant: {
    jti: JTI,
    tenantId: TENANT_ID,
    action: 'ingest',
    expiresAt: FUTURE,
    businessId: BUSINESS_ID,
  },
};

const DOC_CONTENT_B64 = Buffer.from('%PDF-1.4 fake invoice bytes').toString('base64');

const BASE_INPUT = {
  grantJti: JTI,
  idempotencyKey: IDEM_KEY,
  tenantId: TENANT_ID,
  messageId: MSG_ID,
  rawMessageHash: MSG_HASH,
  correlationId: CORR_ID,
  extractedDocuments: [{ hash: 'doc-hash', sizeBytes: 1024, mimeType: 'application/pdf', filename: 'invoice.pdf' }],
};

// OCR runs via getOcrData(injector, file, false) → AnthropicProvider.extractInvoiceDetails.
// A mock operation injector returns a stub Anthropic provider that yields an INVOICE,
// so figureOutSides attributes the recognized business as the document creditor.
const extractInvoiceDetails = vi.fn().mockResolvedValue({ type: DocumentType.Invoice });
const ocrInjector = {
  get: (token: unknown) => (token === AnthropicProvider ? { extractInvoiceDetails } : undefined),
} as unknown as Injector;

// ---------------------------------------------------------------------------
// Mock helper
// ---------------------------------------------------------------------------

type QueryResponse = { rows: unknown[]; rowCount: number };

function isControlStatement(text: string): boolean {
  return (
    text === 'BEGIN' ||
    text === 'COMMIT' ||
    text === 'ROLLBACK' ||
    text.includes('set_config')
  );
}

function makeProvider(
  grantResult: Awaited<ReturnType<EmailIngestionControlProvider['validateAndConsumeGrant']>>,
  dbResponses: QueryResponse[],
) {
  const validateAndConsumeGrant = vi.fn().mockResolvedValue(grantResult);
  const controlProvider = { validateAndConsumeGrant } as unknown as EmailIngestionControlProvider;

  const uploadInvoiceToCloudinary = vi
    .fn()
    .mockResolvedValue({ fileUrl: 'https://cdn/file.pdf', imageUrl: 'https://cdn/file.jpg' });
  const cloudinaryProvider = { uploadInvoiceToCloudinary } as never;

  // Tenant-bound work runs inside a transaction on a pooled client. The mock
  // serves BEGIN / SET LOCAL / COMMIT transparently and dispenses `dbResponses`
  // (in order) only for the actual data queries. `dataQueries` records the
  // data-query SQL (and `dataCalls` the SQL + bound values) so tests can assert
  // which queries ran and with what parameters.
  const responses = [...dbResponses];
  const dataQueries: string[] = [];
  const dataCalls: Array<{ text: string; values: unknown[] }> = [];
  const queryFn = vi.fn((text: unknown, values?: unknown) => {
    const sqlText = typeof text === 'string' ? text : '';
    if (isControlStatement(sqlText)) {
      return Promise.resolve({ rows: [], rowCount: 0 });
    }
    dataQueries.push(sqlText);
    dataCalls.push({ text: sqlText, values: Array.isArray(values) ? values : [] });
    return Promise.resolve(responses.shift() ?? { rows: [], rowCount: 0 });
  });

  const release = vi.fn();
  const connect = vi.fn().mockResolvedValue({ query: queryFn, release });
  const pool = { query: vi.fn(), connect };
  const dbProvider = { pool } as never;

  return {
    provider: new EmailIngestionIngestProvider(dbProvider, controlProvider, cloudinaryProvider),
    validateAndConsumeGrant,
    uploadInvoiceToCloudinary,
    queryFn,
    connect,
    release,
    dataQueries,
    dataCalls,
  };
}

// ---------------------------------------------------------------------------
// performIngest — grant validation
// ---------------------------------------------------------------------------

describe('EmailIngestionIngestProvider.performIngest — grant validation', () => {
  beforeEach(() => {
    vi.useFakeTimers();
    vi.setSystemTime(NOW);
  });
  afterEach(() => {
    vi.useRealTimers();
  });

  it('returns REJECTED with GRANT_INVALID when grant validation fails', async () => {
    const { provider } = makeProvider(
      { valid: false, reason: IngestReasonCode.GRANT_INVALID },
      [],
    );

    const result = await provider.performIngest(BASE_INPUT, ocrInjector);
    expect(result).toEqual({ outcome: IngestOutcome.REJECTED, reasonCode: IngestReasonCode.GRANT_INVALID });
  });

  it('returns REJECTED with TENANT_MISMATCH when grant tenant does not match input', async () => {
    const { provider } = makeProvider(
      { valid: false, reason: IngestReasonCode.TENANT_MISMATCH },
      [],
    );

    const result = await provider.performIngest(BASE_INPUT, ocrInjector);
    expect(result).toEqual({ outcome: IngestOutcome.REJECTED, reasonCode: IngestReasonCode.TENANT_MISMATCH });
  });

  it('does not query the DB when grant validation fails', async () => {
    const { provider, queryFn } = makeProvider(
      { valid: false, reason: IngestReasonCode.GRANT_INVALID },
      [],
    );

    await provider.performIngest(BASE_INPUT, ocrInjector);
    expect(queryFn).not.toHaveBeenCalled();
  });

  it('calls validateAndConsumeGrant with the correct grant binding fields', async () => {
    const { provider, validateAndConsumeGrant } = makeProvider(
      VALID_GRANT,
      // idempotency check (miss) → dedup check (miss) → insert idem → insert dedup
      [
        { rows: [], rowCount: 0 },
        { rows: [], rowCount: 0 },
        { rows: [{ id: 'idem-id', idempotency_key: IDEM_KEY, owner_id: TENANT_ID, outcome: 'inserted', ingest_id: 'ingest-1', audit_id: 'audit-1', created_at: NOW }], rowCount: 1 },
        { rows: [{ id: 'dedup-id', owner_id: TENANT_ID, fingerprint: 'fp', outcome: 'inserted', ingest_id: 'ingest-1', correlation_id: CORR_ID, created_at: NOW }], rowCount: 1 },
      ],
    );

    await provider.performIngest(BASE_INPUT, ocrInjector);

    expect(validateAndConsumeGrant).toHaveBeenCalledWith({
      jti: JTI,
      tenantId: TENANT_ID,
      messageId: MSG_ID,
      rawMessageHash: MSG_HASH,
    });
  });
});

// ---------------------------------------------------------------------------
// performIngest — idempotency check
// ---------------------------------------------------------------------------

describe('EmailIngestionIngestProvider.performIngest — idempotency', () => {
  beforeEach(() => { vi.useFakeTimers(); vi.setSystemTime(NOW); });
  afterEach(() => { vi.useRealTimers(); });

  it('returns DUPLICATE with existing record when idempotency key was seen', async () => {
    const storedRow = {
      id: 'idem-row',
      idempotency_key: IDEM_KEY,
      owner_id: TENANT_ID,
      outcome: IngestOutcome.INSERTED,
      ingest_id: 'prior-ingest-id',
      audit_id: 'prior-audit-id',
      created_at: NOW,
    };
    const { provider } = makeProvider(VALID_GRANT, [{ rows: [storedRow], rowCount: 1 }]);

    const result = await provider.performIngest(BASE_INPUT, ocrInjector);

    expect(result).toMatchObject({
      outcome: IngestOutcome.DUPLICATE,
      existingIngestId: 'prior-ingest-id',
      auditId: 'prior-audit-id',
    });
  });

  it('does not check dedup when idempotency key hit returns early', async () => {
    const storedRow = {
      id: 'idem-row', idempotency_key: IDEM_KEY, owner_id: TENANT_ID,
      outcome: IngestOutcome.INSERTED, ingest_id: 'prior', audit_id: 'audit', created_at: NOW,
    };
    const { provider, dataQueries } = makeProvider(VALID_GRANT, [{ rows: [storedRow], rowCount: 1 }]);

    await provider.performIngest(BASE_INPUT, ocrInjector);
    // Only one data query — the idempotency lookup; no dedup lookup
    expect(dataQueries).toHaveLength(1);
  });
});

// ---------------------------------------------------------------------------
// performIngest — dedup check
// ---------------------------------------------------------------------------

describe('EmailIngestionIngestProvider.performIngest — dedup', () => {
  beforeEach(() => { vi.useFakeTimers(); vi.setSystemTime(NOW); });
  afterEach(() => { vi.useRealTimers(); });

  it('returns DUPLICATE when dedup fingerprint was seen', async () => {
    const dedupRow = {
      id: 'dedup-row', owner_id: TENANT_ID, fingerprint: 'fp',
      outcome: IngestOutcome.INSERTED, ingest_id: 'prior-ingest-id',
      correlation_id: CORR_ID, created_at: NOW,
    };
    const { provider } = makeProvider(VALID_GRANT, [
      { rows: [], rowCount: 0 },       // idempotency miss
      { rows: [dedupRow], rowCount: 1 }, // dedup hit
    ]);

    const result = await provider.performIngest(BASE_INPUT, ocrInjector);

    expect(result).toMatchObject({
      outcome: IngestOutcome.DUPLICATE,
      existingIngestId: 'prior-ingest-id',
    });
  });
});

// ---------------------------------------------------------------------------
// performIngest — quarantine
// ---------------------------------------------------------------------------

describe('EmailIngestionIngestProvider.performIngest — quarantine', () => {
  beforeEach(() => { vi.useFakeTimers(); vi.setSystemTime(NOW); });
  afterEach(() => { vi.useRealTimers(); });

  it('returns QUARANTINED with NO_DOCUMENTS when no documents extracted', async () => {
    const quarantineRow = { id: 'q-id' };
    const idemRow = {
      id: 'idem-row', idempotency_key: IDEM_KEY, owner_id: TENANT_ID,
      outcome: IngestOutcome.QUARANTINED, ingest_id: null, audit_id: 'audit-1', created_at: NOW,
    };
    const dedupRow = {
      id: 'dedup-row', owner_id: TENANT_ID, fingerprint: 'fp',
      outcome: IngestOutcome.QUARANTINED, ingest_id: null, correlation_id: CORR_ID, created_at: NOW,
    };
    const { provider } = makeProvider(VALID_GRANT, [
      { rows: [], rowCount: 0 },          // idempotency miss
      { rows: [], rowCount: 0 },          // dedup miss
      { rows: [quarantineRow], rowCount: 1 }, // quarantine insert
      { rows: [idemRow], rowCount: 1 },   // idempotency insert
      { rows: [dedupRow], rowCount: 1 },  // dedup insert
    ]);

    const result = await provider.performIngest(
      { ...BASE_INPUT, extractedDocuments: [] },
      ocrInjector,
    );

    expect(result).toMatchObject({
      outcome: IngestOutcome.QUARANTINED,
      reasonCode: IngestReasonCode.NO_DOCUMENTS,
    });
  });
});

// ---------------------------------------------------------------------------
// performIngest — happy path (inserted)
// ---------------------------------------------------------------------------

describe('EmailIngestionIngestProvider.performIngest — inserted', () => {
  beforeEach(() => { vi.useFakeTimers(); vi.setSystemTime(NOW); });
  afterEach(() => { vi.useRealTimers(); });

  it('returns INSERTED with ingestId and auditId on happy path', async () => {
    const idemRow = {
      id: 'idem-row', idempotency_key: IDEM_KEY, owner_id: TENANT_ID,
      outcome: IngestOutcome.INSERTED, ingest_id: 'new-ingest-id', audit_id: 'new-audit-id', created_at: NOW,
    };
    const dedupRow = {
      id: 'dedup-row', owner_id: TENANT_ID, fingerprint: 'fp',
      outcome: IngestOutcome.INSERTED, ingest_id: 'new-ingest-id', correlation_id: CORR_ID, created_at: NOW,
    };
    const { provider } = makeProvider(VALID_GRANT, [
      { rows: [], rowCount: 0 },        // idempotency miss
      { rows: [], rowCount: 0 },        // dedup miss
      { rows: [idemRow], rowCount: 1 }, // idempotency insert
      { rows: [dedupRow], rowCount: 1 },// dedup insert
    ]);

    const result = await provider.performIngest(BASE_INPUT, ocrInjector);

    expect(result).toMatchObject({
      outcome: IngestOutcome.INSERTED,
      ingestId: 'new-ingest-id',
      auditId: 'new-audit-id',
    });
  });

  it('makes exactly 4 data queries on happy path (check idem, check dedup, insert idem, insert dedup)', async () => {
    const idemRow = {
      id: 'idem-row', idempotency_key: IDEM_KEY, owner_id: TENANT_ID,
      outcome: IngestOutcome.INSERTED, ingest_id: 'new-ingest-id', audit_id: 'new-audit-id', created_at: NOW,
    };
    const dedupRow = {
      id: 'dedup-row', owner_id: TENANT_ID, fingerprint: 'fp',
      outcome: IngestOutcome.INSERTED, ingest_id: 'new-ingest-id', correlation_id: CORR_ID, created_at: NOW,
    };
    const { provider, dataQueries } = makeProvider(VALID_GRANT, [
      { rows: [], rowCount: 0 },
      { rows: [], rowCount: 0 },
      { rows: [idemRow], rowCount: 1 },
      { rows: [dedupRow], rowCount: 1 },
    ]);

    await provider.performIngest(BASE_INPUT, ocrInjector);

    expect(dataQueries).toHaveLength(4);
  });
});

// ---------------------------------------------------------------------------
// performIngest — document persistence (Workstream D, inline bytes)
// ---------------------------------------------------------------------------

describe('EmailIngestionIngestProvider.performIngest — document persistence', () => {
  beforeEach(() => {
    vi.useFakeTimers();
    vi.setSystemTime(NOW);
  });
  afterEach(() => {
    vi.useRealTimers();
  });

  const idemRow = {
    id: 'idem-row',
    idempotency_key: IDEM_KEY,
    owner_id: TENANT_ID,
    outcome: IngestOutcome.INSERTED,
    ingest_id: 'charge-1',
    audit_id: 'audit-1',
    created_at: NOW,
  };
  const dedupRow = {
    id: 'dedup-row',
    owner_id: TENANT_ID,
    fingerprint: 'fp',
    outcome: IngestOutcome.INSERTED,
    ingest_id: 'charge-1',
    correlation_id: CORR_ID,
    created_at: NOW,
  };
  const inputWithContent = {
    ...BASE_INPUT,
    extractedDocuments: [
      {
        hash: 'doc-hash',
        sizeBytes: 1024,
        mimeType: 'application/pdf',
        filename: 'invoice.pdf',
        content: DOC_CONTENT_B64,
      },
    ],
  };

  it('uploads, creates a charge, and inserts the document when bytes are present', async () => {
    const { provider, uploadInvoiceToCloudinary, dataCalls } = makeProvider(
      VALID_GRANT_WITH_BUSINESS,
      [
        { rows: [], rowCount: 0 }, // document-by-hash miss (prepare tx, pre-upload)
        { rows: [], rowCount: 0 }, // idempotency miss
        { rows: [], rowCount: 0 }, // dedup fingerprint miss
        { rows: [{ id: 'charge-1' }], rowCount: 1 }, // charge insert
        { rows: [{ id: 'doc-1' }], rowCount: 1 }, // document insert
        { rows: [idemRow], rowCount: 1 }, // idempotency insert
        { rows: [dedupRow], rowCount: 1 }, // dedup insert
      ],
    );

    const result = await provider.performIngest(inputWithContent, ocrInjector);

    expect(result).toMatchObject({ outcome: IngestOutcome.INSERTED, ingestId: 'charge-1' });
    expect(uploadInvoiceToCloudinary).toHaveBeenCalledTimes(1);
    expect(uploadInvoiceToCloudinary).toHaveBeenCalledWith(
      expect.stringContaining('data:application/pdf;base64,'),
    );
    // OCR runs at ingest (matching the legacy path) rather than landing UNPROCESSED.
    expect(extractInvoiceDetails).toHaveBeenCalled();

    expect(dataCalls.some(c => c.text.includes('INTO accounter_schema.charges'))).toBe(true);
    const docInsert = dataCalls.find(c => c.text.includes('INTO accounter_schema.documents'));
    expect(docInsert).toBeDefined();
    // the document is classified from OCR (INVOICE), not UNPROCESSED
    expect(docInsert?.values).toContain(DocumentType.Invoice);
    // and the recognized issuing business is attributed as the document creditor
    expect(docInsert?.values).toContain(BUSINESS_ID);
  });

  it('skips upload and charge creation when the document hash already exists', async () => {
    const { provider, uploadInvoiceToCloudinary, dataCalls } = makeProvider(
      VALID_GRANT_WITH_BUSINESS,
      [
        { rows: [{ id: 'existing-doc' }], rowCount: 1 }, // document-by-hash HIT (prepare tx)
        { rows: [], rowCount: 0 }, // idempotency miss
        { rows: [], rowCount: 0 }, // dedup fingerprint miss
        { rows: [idemRow], rowCount: 1 }, // idempotency insert
        { rows: [dedupRow], rowCount: 1 }, // dedup insert
      ],
    );

    const result = await provider.performIngest(inputWithContent, ocrInjector);

    expect(result).toMatchObject({ outcome: IngestOutcome.INSERTED });
    expect(uploadInvoiceToCloudinary).not.toHaveBeenCalled();
    expect(dataCalls.some(c => c.text.includes('INTO accounter_schema.charges'))).toBe(false);
    expect(dataCalls.some(c => c.text.includes('INTO accounter_schema.documents'))).toBe(false);
  });

  it('does not upload or persist when no inline bytes are present (metadata-only)', async () => {
    const { provider, uploadInvoiceToCloudinary, dataQueries } = makeProvider(VALID_GRANT, [
      { rows: [], rowCount: 0 }, // idempotency miss
      { rows: [], rowCount: 0 }, // dedup miss
      { rows: [idemRow], rowCount: 1 }, // idempotency insert
      { rows: [dedupRow], rowCount: 1 }, // dedup insert
    ]);

    // BASE_INPUT documents carry no `content` — persistence is a no-op.
    await provider.performIngest(BASE_INPUT, ocrInjector);

    expect(uploadInvoiceToCloudinary).not.toHaveBeenCalled();
    expect(dataQueries).toHaveLength(4);
  });
});