/**
 * BI-P002 DoD: "Database migrations + persistence + tenant isolation +
 * restore tests."
 *
 * REAL Postgres, same honest-degrade convention as
 * tests/p0/source-registry-postgres.realinfra.test.ts: gated on
 * ANALYTICS_TEST_DATABASE_URL, SKIPS HONESTLY when unset, never fabricates.
 *
 *   docker run -d --name opt-bi-pg -p 15455:5432 \
 *     -e POSTGRES_USER=opt -e POSTGRES_PASSWORD=opt_bi_throwaway \
 *     -e POSTGRES_DB=opt_bi_test postgres:16-alpine
 *   ANALYTICS_TEST_DATABASE_URL=postgres://opt:opt_bi_throwaway@localhost:15455/opt_bi_test \
 *     pnpm vitest run tests/analytics/analytics-domain-postgres.realinfra.test.ts
 *
 * The RESTORE half is the part that catches migration-chain rot: it replays
 * sql/001..008 in order into a FRESH database, exactly as
 * docs/runbook/backup-restore.md describes, and only then runs the
 * persistence assertions. sql/003_datasets.sql exists because that same drill
 * found a table no file ever created; this suite keeps that class of defect
 * from coming back through sql/008.
 */
import { afterAll, beforeAll, describe, expect, it } from 'vitest';
import fs from 'node:fs';
import path from 'node:path';
import postgres from 'postgres';
import {
  ANALYTICS_DOMAIN_ENTITIES,
  ANALYTICS_ENTITY_TABLES,
  IMMUTABLE_VERSION_ENTITIES,
} from '@/src/analytics/domain/entities';
import { AnalyticsDomainRepository } from '@/src/analytics/repositories/analytics-domain-repository';
import { contractHash, type DatasetContract } from '@/src/analytics/domain/contract';

const TEST_DATABASE_URL = process.env.ANALYTICS_TEST_DATABASE_URL;
const run = TEST_DATABASE_URL ? describe : describe.skip;

/** A schema of its own so the drill starts from genuinely nothing. */
const SCHEMA = `bi_p002_${Date.now().toString(36)}`;

let sql: ReturnType<typeof postgres> | undefined;
let reachable = false;
let unreachableReason = '';
/** Which sql/*.sql files the restore drill actually applied. */
const applied: string[] = [];

const ALPHA = { tenant_id: 't_alpha', project_id: 'p_main' };
const BETA = { tenant_id: 't_beta', project_id: 'p_main' };

function repo(): AnalyticsDomainRepository {
  return new AnalyticsDomainRepository(sql!);
}

function contract(datasetId: string): DatasetContract {
  return {
    dataset_id: datasetId,
    version: '1.0.0',
    tier: 'CURATED',
    fields: [{ name: 'id', type: 'string', nullable: false, role: 'identifier', primary_identifier: true }],
    primary_identifiers: ['id'],
    dimensions: [],
    measures: [],
    freshness_slo_seconds: 3600,
    retention_days: 365,
    pii_classification: 'none',
    source_lineage: ['src_x'],
    quality_rules: [],
    allowed_purposes: ['analytics'],
  };
}

beforeAll(async () => {
  if (!TEST_DATABASE_URL) {
    console.warn(
      '[realinfra] ANALYTICS_TEST_DATABASE_URL not set — skipping honestly, not fabricating success.',
    );
    return;
  }
  try {
    sql = postgres(TEST_DATABASE_URL, { prepare: false, ssl: false, max: 3 });
    await Promise.race([
      sql`SELECT 1`,
      new Promise((_, reject) => setTimeout(() => reject(new Error('connect timeout')), 5000)),
    ]);
    // RESTORE DRILL: a brand-new schema, then every migration in order.
    await sql.unsafe(`CREATE SCHEMA ${SCHEMA}`);
    await sql.unsafe(`SET search_path TO ${SCHEMA}, public`);
    const dir = path.join(process.cwd(), 'sql');
    for (const file of fs
      .readdirSync(dir)
      .filter((f) => f.endsWith('.sql'))
      .sort()) {
      const body = fs.readFileSync(path.join(dir, file), 'utf8');
      try {
        await sql.unsafe(`SET search_path TO ${SCHEMA}, public; ${body}`);
        applied.push(file);
      } catch (err) {
        // 001 needs the `vector` extension, which a stock postgres:16-alpine
        // does not carry. Record the skip rather than hiding it — the files
        // sql/008 actually depends on must still apply.
        applied.push(`${file} (FAILED: ${String(err).slice(0, 120)})`);
      }
    }
    reachable = true;
  } catch (err) {
    reachable = false;
    unreachableReason = err instanceof Error ? err.message : String(err);
  }
}, 60_000);

afterAll(async () => {
  if (sql && reachable) {
    await sql.unsafe(`DROP SCHEMA IF EXISTS ${SCHEMA} CASCADE`).catch(() => undefined);
  }
  await sql?.end({ timeout: 5 });
});

run('BI-P002 analytics domain model against a LIVE Postgres', () => {
  it('restore drill: sql/008 applies cleanly on top of the replayed chain', (ctx) => {
    if (!reachable) ctx.skip();
    expect(unreachableReason).toBe('');
    const p008 = applied.find((f) => f.startsWith('008_'));
    expect(p008, `sql/008 was not applied. Applied: ${applied.join(', ')}`).toBe(
      '008_analytics_domain_model.sql',
    );
  });

  it('all nineteen entity tables really exist after the restore', async (ctx) => {
    if (!reachable) ctx.skip();
    const rows = await sql!<{ table_name: string }[]>`
      SELECT table_name FROM information_schema.tables WHERE table_schema = ${SCHEMA}`;
    const present = new Set(rows.map((r) => r.table_name));
    const missing = ANALYTICS_DOMAIN_ENTITIES.filter((e) => !present.has(ANALYTICS_ENTITY_TABLES[e]));
    expect(missing).toEqual([]);
  });

  it('replaying sql/008 a second time is a no-op, not an error', async (ctx) => {
    if (!reachable) ctx.skip();
    const body = fs.readFileSync(path.join(process.cwd(), 'sql', '008_analytics_domain_model.sql'), 'utf8');
    await expect(sql!.unsafe(`SET search_path TO ${SCHEMA}, public; ${body}`)).resolves.toBeDefined();
  });

  it('persists a dataset and reads it back through the repository', async (ctx) => {
    if (!reachable) ctx.skip();
    const r = repo();
    const created = await r.createDataset(ALPHA, {
      dataset_id: 'ds_alpha_1',
      name: 'Alpha listings',
      tier: 'CURATED',
      schema_contract_id: 'dc_alpha',
      schema_contract_version: '1.0.0',
      owner_id: 'team_data',
      source_ref: 'src_feed',
      freshness_slo_seconds: 3600,
      quality_rule_ids: [],
      retention_days: 365,
      classification: 'none',
      status: 'active',
      created_by: 'usr_1',
    });
    expect(created.tenant_id).toBe('t_alpha');
    const read = await r.getDataset(ALPHA, 'ds_alpha_1');
    expect(read?.name).toBe('Alpha listings');
    expect(read?.freshness_slo_seconds).toBe(3600);
    // Cross-check with direct SQL — proving the row is really in the table,
    // not an artifact of the repository's own bookkeeping.
    const direct = await sql!<{ c: string }[]>`
      SELECT count(*)::text AS c FROM opt_analytics_dataset WHERE dataset_id = 'ds_alpha_1'`;
    expect(Number(direct[0].c)).toBe(1);
  });

  it("TENANT ISOLATION: t_beta cannot read t_alpha's dataset, even with the exact id", async (ctx) => {
    if (!reachable) ctx.skip();
    const r = repo();
    expect(await r.getDataset(BETA, 'ds_alpha_1')).toBeUndefined();
    expect(await r.listDatasets(BETA)).toEqual([]);
    // And the row IS there — the empty result is scoping, not absence.
    const direct = await sql!<{ c: string }[]>`SELECT count(*)::text AS c FROM opt_analytics_dataset`;
    expect(Number(direct[0].c)).toBeGreaterThanOrEqual(1);
  });

  it("TENANT ISOLATION: a version cannot be minted against another tenant's dataset", async (ctx) => {
    if (!reachable) ctx.skip();
    await expect(
      repo().createDatasetVersion(BETA, {
        dataset_id: 'ds_alpha_1',
        contract_hash: 'deadbeef',
        schema_contract_version: '1.0.0',
      }),
    ).rejects.toMatchObject({ code: 'NOT_FOUND' });
  });

  it('dataset versions are monotonic and carry the contract hash', async (ctx) => {
    if (!reachable) ctx.skip();
    const r = repo();
    const c = contract('ds_alpha_1');
    const v1 = await r.createDatasetVersion(ALPHA, {
      dataset_id: 'ds_alpha_1',
      contract_hash: contractHash(c),
      schema_contract_version: '1.0.0',
    });
    const v2 = await r.createDatasetVersion(ALPHA, {
      dataset_id: 'ds_alpha_1',
      contract_hash: contractHash({ ...c, version: '2.0.0' }),
      schema_contract_version: '2.0.0',
    });
    expect(v1.version).toBe(1);
    expect(v2.version).toBe(2);
    expect(v2.contract_hash).not.toBe(v1.contract_hash);
    expect((await r.listDatasetVersions(ALPHA, 'ds_alpha_1')).map((v) => v.version)).toEqual([1, 2]);
  });

  it('IMMUTABILITY is enforced by the DATABASE: UPDATE and DELETE on a version row are refused', async (ctx) => {
    if (!reachable) ctx.skip();
    // Direct SQL, bypassing every TypeScript `readonly` — the only test that
    // proves the guarantee survives a psql session.
    await expect(
      sql!.unsafe(
        `UPDATE ${SCHEMA}.opt_analytics_dataset_version SET contract_hash = 'tampered' WHERE dataset_id = 'ds_alpha_1'`,
      ),
    ).rejects.toThrow(/immutable/i);
    await expect(
      sql!.unsafe(`DELETE FROM ${SCHEMA}.opt_analytics_dataset_version WHERE dataset_id = 'ds_alpha_1'`),
    ).rejects.toThrow(/immutable/i);
    // The rows are untouched.
    const rows = await sql!<{ contract_hash: string }[]>`
      SELECT contract_hash FROM opt_analytics_dataset_version WHERE dataset_id = 'ds_alpha_1'`;
    expect(rows).toHaveLength(2);
    for (const r of rows) expect(r.contract_hash).not.toBe('tampered');
  });

  it('all four immutable entities refuse an UPDATE, not just the one that was tested first', async (ctx) => {
    if (!reachable) ctx.skip();
    const r = repo();
    await r.createDataset(ALPHA, {
      dataset_id: 'ds_imm',
      name: 'Immutability fixture',
      tier: 'SERVING',
      schema_contract_id: 'dc_i',
      schema_contract_version: '1.0.0',
      owner_id: 'team_data',
      source_ref: 'src',
      freshness_slo_seconds: 60,
      quality_rule_ids: [],
      retention_days: 30,
      classification: 'none',
      status: 'active',
    });
    const metric = await r.createMetric(ALPHA, {
      metric_id: 'm_imm',
      name: 'immutable metric',
      dataset_id: 'ds_imm',
      aggregation: 'sum',
      measure_field: 'value',
      allowed_dimension_ids: [],
      owner_id: 'team_data',
    });
    await r.createMetricVersion(ALPHA, { metric_id: metric.metric_id, definition_json: '{"v":1}' });
    await r.createDatasetVersion(ALPHA, {
      dataset_id: 'ds_imm',
      contract_hash: 'h1',
      schema_contract_version: '1.0.0',
    });
    await sql!.unsafe(`INSERT INTO ${SCHEMA}.opt_analytics_semantic_model
      (semantic_model_id, tenant_id, project_id, name, version, model_json, model_hash, owner_id)
      VALUES ('sm_1','t_alpha','p_main','model_a',1,'{}','h','team_data')`);
    await sql!.unsafe(`INSERT INTO ${SCHEMA}.opt_analytics_dashboard_definition
      (dashboard_id, tenant_id, project_id, name, owner_id) VALUES ('db_1','t_alpha','p_main','dash','team_data')`);
    await sql!.unsafe(`INSERT INTO ${SCHEMA}.opt_analytics_dashboard_version
      (dashboard_version_id, dashboard_id, tenant_id, project_id, version, layout_json, layout_hash)
      VALUES ('dv_1','db_1','t_alpha','p_main',1,'{}','h')`);

    const updates: Record<string, string> = {
      DatasetVersion: `UPDATE ${SCHEMA}.opt_analytics_dataset_version SET contract_hash='x' WHERE dataset_id='ds_imm'`,
      MetricVersion: `UPDATE ${SCHEMA}.opt_analytics_metric_version SET definition_json='{}' WHERE metric_id='m_imm'`,
      SemanticModel: `UPDATE ${SCHEMA}.opt_analytics_semantic_model SET model_json='{}' WHERE semantic_model_id='sm_1'`,
      DashboardVersion: `UPDATE ${SCHEMA}.opt_analytics_dashboard_version SET layout_json='{}' WHERE dashboard_version_id='dv_1'`,
    };
    for (const entity of IMMUTABLE_VERSION_ENTITIES) {
      await expect(sql!.unsafe(updates[entity]), `${entity} is NOT immutable`).rejects.toThrow(/immutable/i);
    }
  });

  it('a metric version after the first must state WHY the number changed meaning', async (ctx) => {
    if (!reachable) ctx.skip();
    const r = repo();
    await expect(
      r.createMetricVersion(ALPHA, { metric_id: 'm_imm', definition_json: '{"v":2}' }),
    ).rejects.toThrow();
    const v2 = await r.createMetricVersion(ALPHA, {
      metric_id: 'm_imm',
      definition_json: '{"v":2}',
      change_reason: 'excluded internal test accounts from the numerator',
    });
    expect(v2.version).toBe(2);
  });

  it('a DatasetGrant without a purpose is refused by the DATABASE (purpose limitation)', async (ctx) => {
    if (!reachable) ctx.skip();
    // Regression pin: the first version of this constraint was written
    // `array_length(allowed_purposes, 1) >= 1`, which is NULL for '{}' — and a
    // CHECK evaluating to NULL PASSES in Postgres. It could never fail. This
    // test found that; keep it.
    await expect(
      sql!.unsafe(`INSERT INTO ${SCHEMA}.opt_analytics_dataset_grant
        (grant_id, dataset_id, tenant_id, project_id, subject_id, subject_type, level, allowed_purposes)
        VALUES ('g_1','ds_imm','t_alpha','p_main','usr_1','user','read', '{}')`),
    ).rejects.toThrow(/purposes_nonempty/);
    // A grant WITH a purpose is accepted, so the constraint is not simply
    // rejecting everything.
    await expect(
      sql!.unsafe(`INSERT INTO ${SCHEMA}.opt_analytics_dataset_grant
        (grant_id, dataset_id, tenant_id, project_id, subject_id, subject_type, level, allowed_purposes)
        VALUES ('g_ok','ds_imm','t_alpha','p_main','usr_1','user','read', ARRAY['market_analytics'])`),
    ).resolves.toBeDefined();
  });

  it('a BIApplicationBinding without a purpose is refused too, and carries no credential column', async (ctx) => {
    if (!reachable) ctx.skip();
    await expect(
      sql!.unsafe(`INSERT INTO ${SCHEMA}.opt_analytics_bi_application_binding
        (binding_id, tenant_id, project_id, kind, name, principal_id, allowed_purposes)
        VALUES ('b_1','t_alpha','p_main','superset','sup','svc_1','{}')`),
    ).rejects.toThrow(/purposes_nonempty/);

    const cols = await sql!<{ column_name: string }[]>`
      SELECT column_name FROM information_schema.columns
      WHERE table_schema = ${SCHEMA} AND table_name = 'opt_analytics_bi_application_binding'`;
    const names = cols.map((c) => c.column_name.toLowerCase());
    for (const forbidden of ['password', 'secret', 'dsn', 'token', 'connection_string', 'clickhouse_url']) {
      expect(names, `BI binding must never store ${forbidden}`).not.toContain(forbidden);
    }
  });

  it('the dimension catalog is tenant-scoped and FAILS CLOSED for a tenant with none', async (ctx) => {
    if (!reachable) ctx.skip();
    const r = repo();
    await r.createDimension(ALPHA, {
      dimension_id: 'dim_1',
      name: 'make',
      dataset_id: 'ds_imm',
      field_name: 'vehicle_make',
      field_type: 'string',
      classification: 'none',
    });
    expect(await r.dimensionCatalog(ALPHA)).toEqual({ make: 'vehicle_make' });
    // t_beta declared nothing, so it may reference nothing.
    expect(await r.dimensionCatalog(BETA)).toEqual({});
  });

  it('a dimension whose physical field is not identifier-safe is refused by the DATABASE', async (ctx) => {
    if (!reachable) ctx.skip();
    await expect(
      sql!.unsafe(`INSERT INTO ${SCHEMA}.opt_analytics_dimension_definition
        (dimension_id, tenant_id, project_id, name, dataset_id, field_name, field_type)
        VALUES ('dim_bad','t_alpha','p_main','evil','ds_imm', 'x''; DROP TABLE opt_analytics_dataset; --','string')`),
    ).rejects.toThrow();
  });

  it('the repository refuses to act without a verified tenant scope', async (ctx) => {
    if (!reachable) ctx.skip();
    const r = repo();
    await expect(r.getDataset({ tenant_id: '', project_id: 'p' }, 'ds_imm')).rejects.toMatchObject({
      code: 'UNAUTHENTICATED',
    });
    await expect(r.listDatasets({ tenant_id: 't_alpha', project_id: '  ' })).rejects.toMatchObject({
      code: 'UNAUTHENTICATED',
    });
  });
});