import { describe, it, expect, vi, beforeEach } from 'vitest';
import { removeTeamOwner, assignTeamOwner } from '~/models/team';
import { findAllUsers, isUserAdmin } from '~/models/user';

// Helper function to create mock team objects with all required properties
const createMockTeam = (overrides: {
  id: string;
  ownerId: string | null;
  name?: string;
  seasonId?: string;
  draftPosition?: number;
}) => ({
  id: overrides.id,
  name: overrides.name || `Team ${overrides.id}`,
  seasonId: overrides.seasonId || 'season-1',
  ownerId: overrides.ownerId,
  logoUrl: null,
  draftPosition: overrides.draftPosition || 1,
  createdAt: new Date(),
  updatedAt: new Date(),
});

// Mock the models
vi.mock('~/models/team', () => ({
  removeTeamOwner: vi.fn(),
  assignTeamOwner: vi.fn(),
  findTeamsBySeasonId: vi.fn(),
  createManyTeams: vi.fn(),
  deleteTeam: vi.fn(),
}));

vi.mock('~/models/user', () => ({
  findAllUsers: vi.fn(),
  findUserById: vi.fn(),
  isUserAdmin: vi.fn(),
}));

vi.mock('~/models/league', () => ({
  findLeagueById: vi.fn(),
  updateLeague: vi.fn(),
  deleteLeague: vi.fn(),
}));

vi.mock('~/models/commissioner', () => ({
  isCommissioner: vi.fn(),
}));

vi.mock('~/models/season', () => ({
  findCurrentSeasonWithSports: vi.fn(),
  updateSeason: vi.fn(),
}));

vi.mock('~/models/sports-season', () => ({
  findAllSportsSeasons: vi.fn(),
}));

vi.mock('~/models/season-sport', () => ({
  unlinkSportFromSeason: vi.fn(),
  linkMultipleSportsToSeason: vi.fn(),
}));

vi.mock('~/models/draft-slot', () => ({
  findDraftSlotsBySeasonId: vi.fn(),
  setDraftOrder: vi.fn(),
  randomizeDraftOrder: vi.fn(),
}));

describe('Team Management - Remove Owner', () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  it('should successfully remove an owner from a team', async () => {
    const teamId = 'team-1';
    const mockTeam = createMockTeam({ id: teamId, ownerId: null, name: 'Team 1' });

    vi.mocked(removeTeamOwner).mockResolvedValue(mockTeam);

    const result = await removeTeamOwner(teamId);

    expect(removeTeamOwner).toHaveBeenCalledWith(teamId);
    expect(result.ownerId).toBeNull();
    expect(result.id).toBe(teamId);
  });

  it('should handle errors when removing owner fails', async () => {
    const teamId = 'team-1';
    const error = new Error('Database error');

    vi.mocked(removeTeamOwner).mockRejectedValue(error);

    await expect(removeTeamOwner(teamId)).rejects.toThrow('Database error');
  });

  it('should allow commissioners to remove owners', async () => {
    // This would be tested in the action handler
    const teamId = 'team-1';
    const mockTeam = createMockTeam({ id: teamId, ownerId: null, name: 'Team 1' });

    vi.mocked(removeTeamOwner).mockResolvedValue(mockTeam);

    const result = await removeTeamOwner(teamId);

    expect(result.ownerId).toBeNull();
  });
});

describe('Team Management - Assign Owner', () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  it('should successfully assign an owner to a team', async () => {
    const teamId = 'team-1';
    const userId = 'user-uuid-123';
    const mockTeam = createMockTeam({ id: teamId, ownerId: userId, name: 'Team 1' });

    vi.mocked(assignTeamOwner).mockResolvedValue(mockTeam);

    const result = await assignTeamOwner(teamId, userId);

    expect(assignTeamOwner).toHaveBeenCalledWith(teamId, userId);
    expect(result.ownerId).toBe(userId);
    expect(result.id).toBe(teamId);
  });

  it('should handle errors when assigning owner fails', async () => {
    const teamId = 'team-1';
    const userId = 'user-uuid-123';
    const error = new Error('Database error');

    vi.mocked(assignTeamOwner).mockRejectedValue(error);

    await expect(assignTeamOwner(teamId, userId)).rejects.toThrow('Database error');
  });

  it('should only allow admins to assign owners', async () => {
    const userId = 'admin-user-id';
    
    // Mock admin check
    vi.mocked(isUserAdmin).mockResolvedValue(true);

    const isAdmin = await isUserAdmin(userId);

    expect(isAdmin).toBe(true);
    expect(isUserAdmin).toHaveBeenCalledWith(userId);
  });

  it('should prevent non-admins from assigning owners', async () => {
    const userId = 'regular-user-id';
    
    // Mock non-admin check
    vi.mocked(isUserAdmin).mockResolvedValue(false);

    const isAdmin = await isUserAdmin(userId);

    expect(isAdmin).toBe(false);
  });

  it('should replace existing owner when assigning new owner', async () => {
    const teamId = 'team-1';
    const oldOwnerId = 'user-uuid-old';
    const newOwnerId = 'user-uuid-new';
    
    const mockTeam = createMockTeam({ id: teamId, ownerId: newOwnerId, name: 'Team 1' });

    vi.mocked(assignTeamOwner).mockResolvedValue(mockTeam);

    const result = await assignTeamOwner(teamId, newOwnerId);

    expect(result.ownerId).toBe(newOwnerId);
    expect(result.ownerId).not.toBe(oldOwnerId);
  });
});

describe('Team Management - Admin User List', () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  it('should fetch all users for admin dropdown', async () => {
    const mockUsers = [
      {
        id: 'user-1',
        clerkId: null,
        email: 'user1@example.com',
        emailVerified: true,
        username: 'user1',
        displayName: 'User One',
        firstName: 'User',
        lastName: 'One',
        imageUrl: null,
        isAdmin: false,
        timezone: null,
        createdAt: new Date(),
        updatedAt: new Date(),
      },
      {
        id: 'user-2',
        clerkId: null,
        email: 'user2@example.com',
        emailVerified: true,
        username: 'user2',
        displayName: 'User Two',
        firstName: 'User',
        lastName: 'Two',
        imageUrl: null,
        isAdmin: false,
        timezone: null,
        createdAt: new Date(),
        updatedAt: new Date(),
      },
    ];

    vi.mocked(findAllUsers).mockResolvedValue(mockUsers);

    const users = await findAllUsers();

    expect(findAllUsers).toHaveBeenCalled();
    expect(users).toHaveLength(2);
    expect(users[0].displayName).toBe('User One');
    expect(users[1].displayName).toBe('User Two');
  });

  it('should only fetch users when user is admin', async () => {
    const userId = 'admin-user-id';
    
    vi.mocked(isUserAdmin).mockResolvedValue(true);

    const isAdmin = await isUserAdmin(userId);

    if (isAdmin) {
      const mockUsers = [
        {
          id: 'user-1',
          clerkId: null,
          email: 'user1@example.com',
          emailVerified: true,
          username: 'user1',
          displayName: 'User One',
          firstName: 'User',
          lastName: 'One',
          imageUrl: null,
          isAdmin: false,
          timezone: null,
          createdAt: new Date(),
          updatedAt: new Date(),
        },
      ];

      vi.mocked(findAllUsers).mockResolvedValue(mockUsers);
      const users = await findAllUsers();

      expect(users).toHaveLength(1);
    }

    expect(isAdmin).toBe(true);
  });

  it('should return empty array for non-admin users', async () => {
    const userId = 'regular-user-id';
    
    vi.mocked(isUserAdmin).mockResolvedValue(false);

    const isAdmin = await isUserAdmin(userId);

    // Simulate loader behavior: only fetch users if admin
    const users = isAdmin ? await findAllUsers() : [];

    expect(isAdmin).toBe(false);
    expect(users).toHaveLength(0);
    expect(findAllUsers).not.toHaveBeenCalled();
  });
});

describe('Team Management - Authorization', () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  it('should verify admin status before allowing assignment', async () => {
    const userId = 'test-user-id';
    
    vi.mocked(isUserAdmin).mockResolvedValue(true);

    const isAdmin = await isUserAdmin(userId);

    expect(isAdmin).toBe(true);
    expect(isUserAdmin).toHaveBeenCalledWith(userId);
  });

  it('should reject assignment for non-admin users', async () => {
    const userId = 'regular-user-id';
    
    vi.mocked(isUserAdmin).mockResolvedValue(false);

    const isAdmin = await isUserAdmin(userId);

    expect(isAdmin).toBe(false);
    
    // Simulate action handler logic
    if (!isAdmin) {
      expect(assignTeamOwner).not.toHaveBeenCalled();
    }
  });

  it('should allow commissioners to remove owners regardless of admin status', async () => {
    // Commissioners can remove owners even if they're not admins
    const teamId = 'team-1';
    const mockTeam = createMockTeam({ id: teamId, ownerId: null, name: 'Team 1' });

    vi.mocked(removeTeamOwner).mockResolvedValue(mockTeam);

    const result = await removeTeamOwner(teamId);

    expect(removeTeamOwner).toHaveBeenCalledWith(teamId);
    expect(result.ownerId).toBeNull();
  });
});

describe('Team Management - Edge Cases', () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  it('should prevent assigning user who already owns a team in the league', async () => {
    const userId = 'user-uuid-1';
    
    // Simulate that user already owns team-1
    const existingTeams = [
      createMockTeam({ id: 'team-1', ownerId: userId, name: 'Team 1' }),
      createMockTeam({ id: 'team-2', ownerId: null, name: 'Team 2' }),
    ];

    // Check if user already has a team
    const userAlreadyHasTeam = existingTeams.some(team => team.ownerId === userId);
    
    expect(userAlreadyHasTeam).toBe(true);
    
    // Should not call assignTeamOwner if user already has a team
    if (userAlreadyHasTeam) {
      expect(assignTeamOwner).not.toHaveBeenCalled();
    }
  });

  it('should handle removing owner from team that has no owner', async () => {
    const teamId = 'team-1';
    const mockTeam = createMockTeam({ id: teamId, ownerId: null, name: 'Team 1' });

    vi.mocked(removeTeamOwner).mockResolvedValue(mockTeam);

    const result = await removeTeamOwner(teamId);

    expect(result.ownerId).toBeNull();
  });

  it('should handle assigning owner to team that already has owner', async () => {
    const teamId = 'team-1';
    const newOwnerId = 'user-uuid-new';
    const mockTeam = createMockTeam({ id: teamId, ownerId: newOwnerId, name: 'Team 1' });

    vi.mocked(assignTeamOwner).mockResolvedValue(mockTeam);

    const result = await assignTeamOwner(teamId, newOwnerId);

    expect(result.ownerId).toBe(newOwnerId);
  });

  it('should handle invalid team ID gracefully', async () => {
    const invalidTeamId = 'invalid-team-id';
    const error = new Error('Team not found');

    vi.mocked(removeTeamOwner).mockRejectedValue(error);

    await expect(removeTeamOwner(invalidTeamId)).rejects.toThrow('Team not found');
  });

  it('should handle invalid user ID gracefully', async () => {
    const teamId = 'team-1';
    const invalidUserId = 'invalid-user-id';
    const error = new Error('User not found');

    vi.mocked(assignTeamOwner).mockRejectedValue(error);

    await expect(assignTeamOwner(teamId, invalidUserId)).rejects.toThrow('User not found');
  });
});

describe('Team Management - Integration Scenarios', () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  it('should handle complete workflow: assign then remove owner', async () => {
    const teamId = 'team-1';
    const userId = 'user-uuid-123';

    // First, assign owner
    const assignedTeam = createMockTeam({ id: teamId, ownerId: userId, name: 'Team 1' });

    vi.mocked(assignTeamOwner).mockResolvedValue(assignedTeam);
    const assignResult = await assignTeamOwner(teamId, userId);
    expect(assignResult.ownerId).toBe(userId);

    // Then, remove owner
    const removedTeam = createMockTeam({ id: teamId, ownerId: null, name: 'Team 1' });

    vi.mocked(removeTeamOwner).mockResolvedValue(removedTeam);
    const removeResult = await removeTeamOwner(teamId);
    expect(removeResult.ownerId).toBeNull();
  });

  it('should handle reassigning owner from one user to another', async () => {
    const teamId = 'team-1';
    const firstUserId = 'user-uuid-1';
    const secondUserId = 'user-uuid-2';

    // Assign first owner
    const firstAssignment = createMockTeam({ id: teamId, ownerId: firstUserId, name: 'Team 1' });

    vi.mocked(assignTeamOwner).mockResolvedValueOnce(firstAssignment);
    const firstResult = await assignTeamOwner(teamId, firstUserId);
    expect(firstResult.ownerId).toBe(firstUserId);

    // Reassign to second owner
    const secondAssignment = createMockTeam({ id: teamId, ownerId: secondUserId, name: 'Team 1' });

    vi.mocked(assignTeamOwner).mockResolvedValueOnce(secondAssignment);
    const secondResult = await assignTeamOwner(teamId, secondUserId);
    expect(secondResult.ownerId).toBe(secondUserId);
    expect(secondResult.ownerId).not.toBe(firstUserId);
  });

  it('should handle multiple teams with different ownership states', async () => {
    const teams = [
      { id: 'team-1', ownerId: 'user-1' },
      { id: 'team-2', ownerId: null },
      { id: 'team-3', ownerId: 'user-2' },
    ];

    // Remove owner from team-1
    vi.mocked(removeTeamOwner).mockResolvedValueOnce(
      createMockTeam({ id: 'team-1', ownerId: null, name: 'Team 1', draftPosition: 1 })
    );

    const result1 = await removeTeamOwner('team-1');
    expect(result1.ownerId).toBeNull();

    // Assign owner to team-2
    vi.mocked(assignTeamOwner).mockResolvedValueOnce(
      createMockTeam({ id: 'team-2', ownerId: 'user-3', name: 'Team 2', draftPosition: 2 })
    );

    const result2 = await assignTeamOwner('team-2', 'user-3');
    expect(result2.ownerId).toBe('user-3');

    // Leave team-3 unchanged
    expect(teams[2].ownerId).toBe('user-2');
  });
});