/**
 * Unit Tests: Tournament Permissions
 * 
 * Tests the permission system for tournament management
 * Regression tests for the issue where tournament_admin users were redirected to login
 */

import { describe, test, expect, mock, beforeEach } from 'bun:test';
import { canManageTournament, ownsTournament, getManageableTournaments } from '@/lib/permissions';
import { getSession } from '@/lib/auth-simple';
import { prisma } from '@/lib/prisma';
import type { User, Event } from '@prisma/client';

// Create mock functions first
const getSessionMock = mock(() => {});
const userFindUniqueMock = mock(() => {});
const eventFindUniqueMock = mock(() => {});
const eventFindManyMock = mock(() => {});

// Mock the getSession and prisma functions
mock.module('@/lib/auth-simple', () => ({
  getSession: getSessionMock,
}));

mock.module('@/lib/prisma', () => ({
  prisma: {
    user: {
      findUnique: userFindUniqueMock,
    },
    event: {
      findUnique: eventFindUniqueMock,
      findMany: eventFindManyMock,
    },
  },
}));

// Helper to create mock user
const createMockUser = (id: string, email: string, role: string): User => ({
  id,
  email,
  role,
  emailVerified: false,
  name: null,
  image: null,
  playerId: null,
  createdAt: new Date(),
  updatedAt: new Date(),
});

// Helper to create mock tournament
const createMockTournament = (id: number, ownerId: string | null): Event => ({
  id,
  event_id: null,
  name: 'Test Tournament',
  description: null,
  eventDate: new Date(),
  eventType: 'tournament',
  format: 'round_robin',
  status: 'planned',
  maxParticipants: null,
  ownerId,
  targetScore: null,
  allowTies: false,
  createdAt: new Date(),
  updatedAt: new Date(),
});

describe('Tournament Permissions', () => {
  beforeEach(() => {
    // Reset mock implementations to default (no-op) before each test
    // This prevents pollution from previous tests
    getSessionMock.mockImplementation(() => undefined);
    userFindUniqueMock.mockImplementation(() => undefined);
    eventFindUniqueMock.mockImplementation(() => undefined);
    eventFindManyMock.mockImplementation(() => undefined);
  });

  describe('canManageTournament', () => {
    test('should allow club_admin to manage any tournament', async () => {
      getSessionMock.mockImplementation(async () => ({
        user: { id: 'admin-1', email: 'admin@example.com' },
        session: { token: 'test', expiresAt: new Date() }
      }));
      userFindUniqueMock.mockImplementation(async () => 
        createMockUser('admin-1', 'admin@example.com', 'club_admin')
      );

      const result = await canManageTournament(999);
      expect(result.allowed).toBe(true);
    });

    test('should allow tournament_admin to manage their own tournament', async () => {
      getSessionMock.mockImplementation(async () => ({
        user: { id: 'tour-admin-1', email: 'tour@example.com' },
        session: { token: 'test', expiresAt: new Date() }
      }));
      userFindUniqueMock.mockImplementation(async () => 
        createMockUser('tour-admin-1', 'tour@example.com', 'tournament_admin')
      );
      eventFindUniqueMock.mockImplementation(async () => 
        createMockTournament(1, 'tour-admin-1')
      );

      const result = await canManageTournament(1);
      expect(result.allowed).toBe(true);
    });

    test('should deny tournament_admin from managing other users tournaments', async () => {
      getSessionMock.mockImplementation(async () => ({
        user: { id: 'tour-admin-1', email: 'tour@example.com' },
        session: { token: 'test', expiresAt: new Date() }
      }));
      userFindUniqueMock.mockImplementation(async () => 
        createMockUser('tour-admin-1', 'tour@example.com', 'tournament_admin')
      );
      eventFindUniqueMock.mockImplementation(async () => 
        createMockTournament(1, 'other-user-1')
      );

      const result = await canManageTournament(1);
      expect(result.allowed).toBe(false);
      expect(result.reason).toContain('does not own this tournament');
    });

    test('should deny player from managing tournaments', async () => {
      getSessionMock.mockImplementation(async () => ({
        user: { id: 'player-1', email: 'player@example.com' },
        session: { token: 'test', expiresAt: new Date() }
      }));
      userFindUniqueMock.mockImplementation(async () => 
        createMockUser('player-1', 'player@example.com', 'player')
      );

      const result = await canManageTournament(999);
      expect(result.allowed).toBe(false);
      expect(result.reason).toContain('Insufficient permissions');
    });

    test('should deny unauthenticated user', async () => {
      getSessionMock.mockImplementation(async () => null);

      const result = await canManageTournament(999);
      expect(result.allowed).toBe(false);
      expect(result.reason).toContain('Not authenticated');
    });
  });

  describe('ownsTournament', () => {
    test('should return true if user owns tournament', async () => {
      getSessionMock.mockImplementation(async () => ({
        user: { id: 'owner-1', email: 'owner@example.com' },
        session: { token: 'test', expiresAt: new Date() }
      }));
      eventFindUniqueMock.mockImplementation(async () => 
        createMockTournament(1, 'owner-1')
      );

      const result = await ownsTournament(1);
      expect(result.allowed).toBe(true);
    });

    test('should return false if user does not own tournament', async () => {
      getSessionMock.mockImplementation(async () => ({
        user: { id: 'non-owner-1', email: 'nonowner@example.com' },
        session: { token: 'test', expiresAt: new Date() }
      }));
      eventFindUniqueMock.mockImplementation(async () => 
        createMockTournament(1, 'owner-1')
      );

      const result = await ownsTournament(1);
      expect(result.allowed).toBe(false);
      expect(result.reason).toContain('does not own this tournament');
    });
  });

  describe('getManageableTournaments', () => {
    test('should return all tournaments for club_admin', async () => {
      getSessionMock.mockImplementation(async () => ({
        user: { id: 'admin-1', email: 'admin@example.com' },
        session: { token: 'test', expiresAt: new Date() }
      }));
      userFindUniqueMock.mockImplementation(async () => 
        createMockUser('admin-1', 'admin@example.com', 'club_admin')
      );
      
      const mockTournaments = [
        createMockTournament(1, 'user-1'),
        createMockTournament(2, 'user-2'),
        createMockTournament(3, 'user-3'),
      ];
      eventFindManyMock.mockImplementation(async () => mockTournaments);

      const result = await getManageableTournaments();
      expect(result).toEqual(mockTournaments);
      expect(eventFindManyMock).toHaveBeenCalledWith({
        where: { eventType: 'tournament' },
        include: { participants: true },
        orderBy: { createdAt: 'desc' }
      });
    });

    test('should return only owned tournaments for tournament_admin', async () => {
      getSessionMock.mockImplementation(async () => ({
        user: { id: 'tour-admin-1', email: 'tour@example.com' },
        session: { token: 'test', expiresAt: new Date() }
      }));
      userFindUniqueMock.mockImplementation(async () => 
        createMockUser('tour-admin-1', 'tour@example.com', 'tournament_admin')
      );
      
      const mockTournaments = [
        createMockTournament(1, 'tour-admin-1'),
        createMockTournament(2, 'tour-admin-1'),
      ];
      eventFindManyMock.mockImplementation(async () => mockTournaments);

      const result = await getManageableTournaments();
      expect(result).toEqual(mockTournaments);
      expect(eventFindManyMock).toHaveBeenCalledWith({
        where: { 
          eventType: 'tournament',
          ownerId: 'tour-admin-1'
        },
        include: { participants: true },
        orderBy: { createdAt: 'desc' }
      });
    });

    test('should return only non-draft tournaments for players', async () => {
      getSessionMock.mockImplementation(async () => ({
        user: { id: 'player-1', email: 'player@example.com' },
        session: { token: 'test', expiresAt: new Date() }
      }));
      userFindUniqueMock.mockImplementation(async () => 
        createMockUser('player-1', 'player@example.com', 'player')
      );
      
      const mockTournaments = [
        createMockTournament(1, 'user-1'),
        createMockTournament(2, 'user-2'),
      ];
      eventFindManyMock.mockImplementation(async () => mockTournaments);

      const result = await getManageableTournaments();
      expect(result).toEqual(mockTournaments);
      expect(eventFindManyMock).toHaveBeenCalledWith({
        where: { 
          eventType: 'tournament',
          status: { not: 'draft' }
        },
        include: { participants: true },
        orderBy: { createdAt: 'desc' }
      });
    });
  });

  describe('Regression Tests', () => {
    test('tournament_admin should be able to access edit page for their tournament', async () => {
      // This simulates the scenario where a tournament_admin user
      // clicks "Edit" on a tournament they own
      
      getSessionMock.mockImplementation(async () => ({
        user: { id: 'tour-admin-1', email: 'tour@example.com' },
        session: { token: 'test', expiresAt: new Date() }
      }));
      userFindUniqueMock.mockImplementation(async () => 
        createMockUser('tour-admin-1', 'tour@example.com', 'tournament_admin')
      );
      eventFindUniqueMock.mockImplementation(async () => 
        createMockTournament(1, 'tour-admin-1')
      );

      // This is the permission check that happens on the edit page
      const result = await canManageTournament(1);
      
      // Before the fix, this would return false because the page only checked for club_admin
      // After the fix, it should return true because the user owns the tournament
      expect(result.allowed).toBe(true);
    });

    test('club_admin should still be able to manage any tournament', async () => {
      // This ensures we didn't break the existing club_admin functionality
      
      getSessionMock.mockImplementation(async () => ({
        user: { id: 'club-admin-1', email: 'club@example.com' },
        session: { token: 'test', expiresAt: new Date() }
      }));
      userFindUniqueMock.mockImplementation(async () => 
        createMockUser('club-admin-1', 'club@example.com', 'club_admin')
      );

      const result = await canManageTournament(999);
      expect(result.allowed).toBe(true);
    });

    test('players should still be denied from managing tournaments', async () => {
      // This ensures we didn't accidentally grant players access
      
      getSessionMock.mockImplementation(async () => ({
        user: { id: 'player-1', email: 'player@example.com' },
        session: { token: 'test', expiresAt: new Date() }
      }));
      userFindUniqueMock.mockImplementation(async () => 
        createMockUser('player-1', 'player@example.com', 'player')
      );
      eventFindUniqueMock.mockImplementation(async () =>
        createMockTournament(1, 'other-user-1')
      );

      const result = await canManageTournament(1);
      expect(result.allowed).toBe(false);
    });
  });
});