/**
 * Auth API Tests – Register / Login / Logout / Me / Password Change
 */
import { describe, it, expect, beforeAll, afterAll, beforeEach } from 'vitest';
import type { FastifyInstance } from 'fastify';
import { SqliteAdapter } from '../src/database/SqliteAdapter.js';
import { createServer } from '../src/server.js';

describe('Auth API', () => {
  let app: FastifyInstance;
  let db: SqliteAdapter;
  let authToken: string | null = null;

  beforeAll(async () => {
    db = new SqliteAdapter(':memory:');
    await db.init();
    app = await createServer({ db, port: 0 });
    await app.ready();
  });

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

  // ─── Register ────────────────────────────────────────

  describe('POST /api/auth/register', () => {
    it('should register a new user with 201', async () => {
      const response = await app.inject({
        method: 'POST',
        url: '/api/auth/register',
        payload: {
          email: 'testuser@example.com',
          password: 'TestPass123!',
          name: 'Test User',
          role: 'planer',
        },
      });
      expect(response.statusCode).toBe(201);
      const body = JSON.parse(response.body);
      expect(body.user).toBeDefined();
      expect(body.user.email).toBe('testuser@example.com');
      expect(body.user.name).toBe('Test User');
      expect(body.user.password_hash).toBeUndefined();
      expect(body.session).toBeDefined();
      expect(body.session.token).toBeDefined();
      authToken = body.session.token;
    });

    it('should reject duplicate registration with 409', async () => {
      const response = await app.inject({
        method: 'POST',
        url: '/api/auth/register',
        payload: {
          email: 'testuser@example.com',
          password: 'TestPass123!',
          name: 'Test User 2',
        },
      });
      expect(response.statusCode).toBe(409);
      const body = JSON.parse(response.body);
      expect(body.error).toContain('already registered');
    });

    it('should reject missing fields with 400', async () => {
      const response = await app.inject({
        method: 'POST',
        url: '/api/auth/register',
        payload: { email: 'incomplete@example.com' },
      });
      expect(response.statusCode).toBe(400);
    });
  });

  // ─── Login ──────────────────────────────────────────

  describe('POST /api/auth/login', () => {
    it('should login with correct credentials', async () => {
      const response = await app.inject({
        method: 'POST',
        url: '/api/auth/login',
        payload: {
          email: 'testuser@example.com',
          password: 'TestPass123!',
        },
      });
      expect(response.statusCode).toBe(200);
      const body = JSON.parse(response.body);
      expect(body.user).toBeDefined();
      expect(body.session.token).toBeDefined();
      authToken = body.session.token;
    });

    it('should reject wrong password with 401', async () => {
      const response = await app.inject({
        method: 'POST',
        url: '/api/auth/login',
        payload: {
          email: 'testuser@example.com',
          password: 'WrongPassword!',
        },
      });
      expect(response.statusCode).toBe(401);
    });

    it('should reject non-existent email with 401', async () => {
      const response = await app.inject({
        method: 'POST',
        url: '/api/auth/login',
        payload: {
          email: 'nobody@example.com',
          password: 'SomePassword!',
        },
      });
      expect(response.statusCode).toBe(401);
    });

    it('should reject missing fields with 400', async () => {
      const response = await app.inject({
        method: 'POST',
        url: '/api/auth/login',
        payload: { email: 'testuser@example.com' },
      });
      expect(response.statusCode).toBe(400);
    });
  });

  // ─── Me ─────────────────────────────────────────────

  describe('GET /api/auth/me', () => {
    it('should return current user profile with valid token', async () => {
      const response = await app.inject({
        method: 'GET',
        url: '/api/auth/me',
        headers: { authorization: `Bearer ${authToken}` },
      });
      expect(response.statusCode).toBe(200);
      const body = JSON.parse(response.body);
      expect(body.email).toBe('testuser@example.com');
      expect(body.password_hash).toBeUndefined();
    });

    it('should reject without token with 401', async () => {
      const response = await app.inject({
        method: 'GET',
        url: '/api/auth/me',
      });
      expect(response.statusCode).toBe(401);
    });

    it('should reject invalid token with 401', async () => {
      const response = await app.inject({
        method: 'GET',
        url: '/api/auth/me',
        headers: { authorization: 'Bearer invalid-token-xxx' },
      });
      expect(response.statusCode).toBe(401);
    });
  });

  // ─── Password Change ───────────────────────────────

  describe('PATCH /api/auth/password', () => {
    it('should change password with correct old password', async () => {
      const response = await app.inject({
        method: 'PATCH',
        url: '/api/auth/password',
        headers: { authorization: `Bearer ${authToken}` },
        payload: {
          oldPassword: 'TestPass123!',
          newPassword: 'NewPassword456!',
        },
      });
      expect(response.statusCode).toBe(204);
    });

    it('should allow login with new password', async () => {
      const response = await app.inject({
        method: 'POST',
        url: '/api/auth/login',
        payload: {
          email: 'testuser@example.com',
          password: 'NewPassword456!',
        },
      });
      expect(response.statusCode).toBe(200);
      const body = JSON.parse(response.body);
      expect(body.session.token).toBeDefined();
      authToken = body.session.token;
    });

    it('should reject old password after change', async () => {
      const response = await app.inject({
        method: 'POST',
        url: '/api/auth/login',
        payload: {
          email: 'testuser@example.com',
          password: 'TestPass123!',
        },
      });
      expect(response.statusCode).toBe(401);
    });

    it('should reject password change with wrong old password', async () => {
      const response = await app.inject({
        method: 'PATCH',
        url: '/api/auth/password',
        headers: { authorization: `Bearer ${authToken}` },
        payload: {
          oldPassword: 'WrongOldPassword!',
          newPassword: 'AnotherNew789!',
        },
      });
      expect(response.statusCode).toBe(400);
    });

    it('should reject password change without auth', async () => {
      const response = await app.inject({
        method: 'PATCH',
        url: '/api/auth/password',
        payload: {
          oldPassword: 'NewPassword456!',
          newPassword: 'AnotherNew789!',
        },
      });
      expect(response.statusCode).toBe(401);
    });

    it('should reject missing password fields', async () => {
      const response = await app.inject({
        method: 'PATCH',
        url: '/api/auth/password',
        headers: { authorization: `Bearer ${authToken}` },
        payload: { oldPassword: 'NewPassword456!' },
      });
      expect(response.statusCode).toBe(400);
    });
  });

  // ─── Logout ─────────────────────────────────────────

  describe('POST /api/auth/logout', () => {
    it('should logout and invalidate token', async () => {
      const response = await app.inject({
        method: 'POST',
        url: '/api/auth/logout',
        headers: { authorization: `Bearer ${authToken}` },
      });
      expect(response.statusCode).toBe(204);

      // Token should now be invalid
      const meResponse = await app.inject({
        method: 'GET',
        url: '/api/auth/me',
        headers: { authorization: `Bearer ${authToken}` },
      });
      expect(meResponse.statusCode).toBe(401);
    });

    it('should return 204 even without token', async () => {
      const response = await app.inject({
        method: 'POST',
        url: '/api/auth/logout',
      });
      expect(response.statusCode).toBe(204);
    });
  });
});