import { randomUUID } from 'node:crypto';
import type { DestinationStream } from 'pino';
import type pg from 'pg';
import { afterAll, beforeAll, describe, expect, it } from 'vitest';
import { buildApp } from '../build-app.js';
import { createPool } from '../../infrastructure/db/pool.js';
import { createLogger } from '../../infrastructure/logging/logger.js';
import {
  getTestDbUrl,
  recreateDatabase,
  runMigrations,
} from '../../infrastructure/db/tests/db-test-support.js';
import { SESSION_COOKIE_NAME } from '../../modules/identity/index.js';

const hasDb = Boolean(process.env.TEST_DATABASE_URL);

function silentLogger() {
  const destination: DestinationStream = { write: () => undefined };
  return createLogger({ level: 'info', destination });
}

function cookieValue(setCookieHeader: string | string[] | undefined): string {
  const raw = Array.isArray(setCookieHeader) ? setCookieHeader[0] : setCookieHeader;
  expect(raw).toBeDefined();
  const pair = (raw as string).split(';')[0] as string;
  return pair.slice(pair.indexOf('=') + 1);
}

describe.skipIf(!hasDb)('pricing flows (real PostgreSQL)', () => {
  const url = hasDb ? getTestDbUrl() : '';
  let pool: pg.Pool;
  let app: Awaited<ReturnType<typeof buildApp>>;
  let adminCookie = '';

  beforeAll(async () => {
    await recreateDatabase(url);
    await runMigrations(url, 'up');
    pool = createPool(url);
    app = await buildApp({ logger: silentLogger(), pool, cookieSecure: true });

    const user = { email: 'pricing-admin@example.com', password: 'correct horse battery staple' };
    const registered = await app.inject({
      method: 'POST',
      url: '/auth/register',
      headers: { 'content-type': 'application/json' },
      payload: user,
    });
    expect(registered.statusCode).toBe(201);
    const id = (registered.json() as { id: string }).id;
    await pool.query('UPDATE identity_users SET role = $1 WHERE id = $2', ['admin', id]);

    const login = await app.inject({
      method: 'POST',
      url: '/auth/login',
      headers: { 'content-type': 'application/json' },
      payload: user,
    });
    expect(login.statusCode).toBe(200);
    adminCookie = cookieValue(login.headers['set-cookie']);
  });

  afterAll(async () => {
    await app.close();
    await pool.end();
  });

  it('calculates totals with VAT from server-side price (AC1)', async () => {
    const variantId = randomUUID();
    const setPrice = await app.inject({
      method: 'PUT',
      url: `/pricing/variants/${variantId}`,
      headers: { 'content-type': 'application/json' },
      cookies: { [SESSION_COOKIE_NAME]: adminCookie },
      payload: { netUnitAmountCents: 1000, vatRate: 'general' },
    });
    expect(setPrice.statusCode).toBe(200);

    const calculation = await app.inject({
      method: 'POST',
      url: '/pricing/calculate',
      headers: { 'content-type': 'application/json' },
      payload: { variantId, quantity: 2 },
    });

    expect(calculation.statusCode).toBe(200);
    expect(calculation.json()).toMatchObject({
      variantId,
      quantity: 2,
      currency: 'EUR',
      vatRate: 'general',
      vatBasisPoints: 2100,
      netUnitAmountCents: 1000,
      netSubtotalCents: 2000,
      vatAmountCents: 420,
      totalCents: 2420,
    });
  });

  it('ignores client-supplied prices and recalculates from the server (AC2)', async () => {
    const variantId = randomUUID();
    await app.inject({
      method: 'PUT',
      url: `/pricing/variants/${variantId}`,
      headers: { 'content-type': 'application/json' },
      cookies: { [SESSION_COOKIE_NAME]: adminCookie },
      payload: { netUnitAmountCents: 500, vatRate: 'reduced' },
    });

    const calculation = await app.inject({
      method: 'POST',
      url: '/pricing/calculate',
      headers: { 'content-type': 'application/json' },
      payload: {
        variantId,
        quantity: 3,
        netUnitAmountCents: 1,
        totalCents: 1,
        vatAmountCents: 0,
      },
    });

    expect(calculation.statusCode).toBe(200);
    expect(calculation.json()).toMatchObject({
      netUnitAmountCents: 500,
      netSubtotalCents: 1500,
      vatAmountCents: 150,
      totalCents: 1650,
    });
  });

  it('writes a history row for creation and every price change (AC3)', async () => {
    const variantId = randomUUID();
    await app.inject({
      method: 'PUT',
      url: `/pricing/variants/${variantId}`,
      headers: { 'content-type': 'application/json' },
      cookies: { [SESSION_COOKIE_NAME]: adminCookie },
      payload: { netUnitAmountCents: 100, vatRate: 'general' },
    });
    await app.inject({
      method: 'PUT',
      url: `/pricing/variants/${variantId}`,
      headers: { 'content-type': 'application/json' },
      cookies: { [SESSION_COOKIE_NAME]: adminCookie },
      payload: { netUnitAmountCents: 200, vatRate: 'reduced' },
    });

    const history = await pool.query(
      `SELECT previous_net_unit_amount_cents, previous_vat_rate,
              new_net_unit_amount_cents, new_vat_rate
       FROM pricing_price_history
       WHERE variant_id = $1
       ORDER BY created_at, id`,
      [variantId],
    );
    expect(history.rows).toEqual([
      {
        previous_net_unit_amount_cents: null,
        previous_vat_rate: null,
        new_net_unit_amount_cents: 100,
        new_vat_rate: 'general',
      },
      {
        previous_net_unit_amount_cents: 100,
        previous_vat_rate: 'general',
        new_net_unit_amount_cents: 200,
        new_vat_rate: 'reduced',
      },
    ]);
  });
});