import { describe, expect, it } from 'vitest';
import {
  AUTH_SESSION_COOKIE_NAME,
  AuthError,
  getCurrentUser,
  getConfiguredAdminEmails,
  hashSessionToken,
  isConfiguredAdminEmail,
  parseCookieHeader,
  requireAdmin,
  requireUser,
} from '../worker/auth';
import type { Env } from '../worker/env';

type SessionRow = {
  id: string;
  email: string | null;
  name: string | null;
  image_url: string | null;
  role: 'user' | 'admin';
  expires_at: string;
  session_token_hash: string;
};

class FakeSessionD1 {
  constructor(private readonly rows: SessionRow[]) {}

  prepare(sql: string): FakeSessionStatement {
    return new FakeSessionStatement(this.rows, sql);
  }
}

class FakeSessionStatement {
  private params: unknown[] = [];

  constructor(
    private readonly rows: SessionRow[],
    private readonly sql: string,
  ) {}

  bind(...params: unknown[]): this {
    this.params = params;
    return this;
  }

  async first<T>(): Promise<T | null> {
    expect(this.sql).toContain('session_token_hash');
    expect(this.sql).toContain('JOIN users');
    expect(this.sql).toContain('expires_at');

    const hash = String(this.params[0]);
    const row = this.rows.find((candidate) => candidate.session_token_hash === hash);

    if (!row) {
      return null;
    }

    return {
      id: row.id,
      email: row.email,
      name: row.name,
      image_url: row.image_url,
      role: row.role,
      expires_at: row.expires_at,
    } as T;
  }
}

function makeEnv(rows: SessionRow[] = [], overrides: Partial<Env> = {}): { env: Env; db: FakeSessionD1 } {
  const db = new FakeSessionD1(rows);
  return {
    env: {
      DB: db as unknown as D1Database,
      PUBLIC_HOST: 'heygo.cc',
      PRIVATE_HOST: 'my.heygo.cc',
      APP_BASE_URL: 'https://heygo.cc',
      COOKIE_DOMAIN: '.heygo.cc',
      ...overrides,
    },
    db,
  };
}

function makeRequest(cookieHeader?: string | null): Request {
  const headers = new Headers();
  if (cookieHeader != null) {
    headers.set('cookie', cookieHeader);
  }
  return new Request('https://my.heygo.cc/api/me', { headers });
}

function futureIso(): string {
  return new Date(Date.now() + 60 * 60 * 1000).toISOString();
}

function pastIso(): string {
  return new Date(Date.now() - 60 * 60 * 1000).toISOString();
}

describe('parseCookieHeader', () => {
  it('returns empty object for null/undefined/empty', () => {
    expect(parseCookieHeader(null)).toEqual({});
    expect(parseCookieHeader(undefined)).toEqual({});
    expect(parseCookieHeader('')).toEqual({});
  });

  it('parses multiple cookies', () => {
    expect(parseCookieHeader('a=1; b=2; c=hello')).toEqual({
      a: '1',
      b: '2',
      c: 'hello',
    });
  });

  it('trims whitespace around keys and values', () => {
    expect(parseCookieHeader('  a = 1 ;  b = 2  ')).toEqual({
      a: '1',
      b: '2',
    });
  });
});

describe('hashSessionToken', () => {
  it('is deterministic and matches known SHA-256 for "hello"', async () => {
    const hash = await hashSessionToken('hello');
    expect(hash).toBe('2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824');
  });

  it('returns lowercase hex', async () => {
    const hash = await hashSessionToken('SomeMixedCaseToken!');
    expect(hash).toMatch(/^[0-9a-f]{64}$/);
  });
});

describe('configured admin emails', () => {
  it('parses comma, semicolon, and whitespace separated admin emails case-insensitively', () => {
    const emails = getConfiguredAdminEmails({
      ADMIN_EMAILS: ' Boss@Heygo.cc, owner@example.com; ops@example.com\n',
    });

    expect([...emails]).toEqual(['boss@heygo.cc', 'owner@example.com', 'ops@example.com']);
    expect(isConfiguredAdminEmail('boss@heygo.cc', { ADMIN_EMAILS: 'Boss@Heygo.cc' })).toBe(true);
    expect(isConfiguredAdminEmail('BOSS@HEYGO.CC', { ADMIN_EMAILS: 'boss@heygo.cc' })).toBe(true);
    expect(isConfiguredAdminEmail('person@heygo.cc', { ADMIN_EMAILS: 'boss@heygo.cc' })).toBe(false);
  });
});

describe('getCurrentUser', () => {
  it('returns null when there is no Cookie header', async () => {
    const { env } = makeEnv();
    const user = await getCurrentUser(makeRequest(), env);
    expect(user).toBeNull();
  });

  it('returns null when the session cookie is missing', async () => {
    const { env } = makeEnv();
    const user = await getCurrentUser(makeRequest('other=1'), env);
    expect(user).toBeNull();
  });

  it('returns null when the session token has no matching session row', async () => {
    const { env } = makeEnv();
    const cookie = `${AUTH_SESSION_COOKIE_NAME}=unknown-token`;
    const user = await getCurrentUser(makeRequest(cookie), env);
    expect(user).toBeNull();
  });

  it('returns the user for a valid, non-expired session', async () => {
    const token = 'valid-session-token';
    const hash = await hashSessionToken(token);
    const { env } = makeEnv([
      {
        id: 'user_1',
        email: 'admin@heygo.cc',
        name: 'Admin',
        image_url: 'https://example.com/avatar.png',
        role: 'admin',
        expires_at: futureIso(),
        session_token_hash: hash,
      },
    ]);

    const cookie = `${AUTH_SESSION_COOKIE_NAME}=${token}`;
    const user = await getCurrentUser(makeRequest(cookie), env);

    expect(user).toEqual({
      id: 'user_1',
      email: 'admin@heygo.cc',
      name: 'Admin',
      imageUrl: 'https://example.com/avatar.png',
      role: 'admin',
    });
  });

  it('treats a configured admin email as admin even when the database role is user', async () => {
    const token = 'configured-admin-token';
    const hash = await hashSessionToken(token);
    const { env } = makeEnv(
      [
        {
          id: 'user_configured_admin',
          email: 'Boss@Heygo.cc',
          name: 'Boss',
          image_url: null,
          role: 'user',
          expires_at: futureIso(),
          session_token_hash: hash,
        },
      ],
      { ADMIN_EMAILS: 'boss@heygo.cc' },
    );

    const cookie = `${AUTH_SESSION_COOKIE_NAME}=${token}`;
    const user = await getCurrentUser(makeRequest(cookie), env);

    expect(user?.role).toBe('admin');
  });

  it('returns null for an expired session', async () => {
    const token = 'expired-session-token';
    const hash = await hashSessionToken(token);
    const { env } = makeEnv([
      {
        id: 'user_2',
        email: 'user@heygo.cc',
        name: 'User',
        image_url: null,
        role: 'user',
        expires_at: pastIso(),
        session_token_hash: hash,
      },
    ]);

    const cookie = `${AUTH_SESSION_COOKIE_NAME}=${token}`;
    const user = await getCurrentUser(makeRequest(cookie), env);
    expect(user).toBeNull();
  });
});

describe('requireUser', () => {
  it('throws AuthError when unauthenticated', async () => {
    const { env } = makeEnv();
    await expect(requireUser(makeRequest(), env)).rejects.toThrow(AuthError);
    await expect(requireUser(makeRequest(), env)).rejects.toMatchObject({ status: 401 });
  });

  it('returns the user when authenticated', async () => {
    const token = 'valid-user-token';
    const hash = await hashSessionToken(token);
    const { env } = makeEnv([
      {
        id: 'user_3',
        email: 'person@heygo.cc',
        name: 'Person',
        image_url: null,
        role: 'user',
        expires_at: futureIso(),
        session_token_hash: hash,
      },
    ]);

    const cookie = `${AUTH_SESSION_COOKIE_NAME}=${token}`;
    const user = await requireUser(makeRequest(cookie), env);
    expect(user.id).toBe('user_3');
  });
});

describe('requireAdmin', () => {
  it('rejects an unauthenticated request', async () => {
    const { env } = makeEnv();
    await expect(requireAdmin(makeRequest(), env)).rejects.toThrow(AuthError);
    await expect(requireAdmin(makeRequest(), env)).rejects.toMatchObject({ status: 401 });
  });

  it('rejects a normal (non-admin) user', async () => {
    const token = 'normal-user-token';
    const hash = await hashSessionToken(token);
    const { env } = makeEnv([
      {
        id: 'user_4',
        email: 'normal@heygo.cc',
        name: 'Normal',
        image_url: null,
        role: 'user',
        expires_at: futureIso(),
        session_token_hash: hash,
      },
    ]);

    const cookie = `${AUTH_SESSION_COOKIE_NAME}=${token}`;
    await expect(requireAdmin(makeRequest(cookie), env)).rejects.toThrow(AuthError);
    await expect(requireAdmin(makeRequest(cookie), env)).rejects.toMatchObject({ status: 403 });
  });

  it('returns the admin user for an admin session', async () => {
    const token = 'admin-session-token';
    const hash = await hashSessionToken(token);
    const { env } = makeEnv([
      {
        id: 'user_5',
        email: 'boss@heygo.cc',
        name: 'Boss',
        image_url: null,
        role: 'admin',
        expires_at: futureIso(),
        session_token_hash: hash,
      },
    ]);

    const cookie = `${AUTH_SESSION_COOKIE_NAME}=${token}`;
    const user = await requireAdmin(makeRequest(cookie), env);
    expect(user.id).toBe('user_5');
    expect(user.role).toBe('admin');
  });

  it('allows a configured admin email through requireAdmin', async () => {
    const token = 'configured-admin-require-token';
    const hash = await hashSessionToken(token);
    const { env } = makeEnv(
      [
        {
          id: 'user_6',
          email: 'owner@heygo.cc',
          name: 'Owner',
          image_url: null,
          role: 'user',
          expires_at: futureIso(),
          session_token_hash: hash,
        },
      ],
      { ADMIN_EMAILS: 'owner@heygo.cc' },
    );

    const cookie = `${AUTH_SESSION_COOKIE_NAME}=${token}`;
    const user = await requireAdmin(makeRequest(cookie), env);

    expect(user.id).toBe('user_6');
    expect(user.role).toBe('admin');
  });
});