import { describe, it, expect, vi, beforeEach } from 'vitest';
import { deleteAllDraftPicks } from '~/models/draft-pick';
import { clearAllQueuesForSeason } from '~/models/draft-queue';
import { deleteSeasonTimers } from '~/models/draft-timer';
import { updateSeason } from '~/models/season';
import { isUserAdmin } from '~/models/user';

// Helper function to create mock season objects with all required properties
const createMockSeason = (overrides: {
  id: string;
  status: 'pre_draft' | 'draft' | 'active' | 'completed';
  leagueId?: string;
  year?: number;
}) => ({
  id: overrides.id,
  leagueId: overrides.leagueId || 'league-1',
  year: overrides.year || 2025,
  status: overrides.status,
  templateId: null,
  draftRounds: 20,
  flexSpots: 0,
  draftDateTime: null,
  draftInitialTime: 120,
  draftIncrementTime: 15,
  draftTimerMode: 'chess_clock' as const,
  currentPickNumber: null,
  draftStartedAt: null,
  draftPaused: false,
  inviteCode: 'ABC123',
  pointsFor1st: 100,
  pointsFor2nd: 70,
  pointsFor3rd: 50,
  pointsFor4th: 40,
  pointsFor5th: 25,
  pointsFor6th: 25,
  pointsFor7th: 15,
  pointsFor8th: 15,
  createdAt: new Date(),
  updatedAt: new Date(),
});

// Mock the models
vi.mock('~/models/draft-pick', () => ({
  deleteAllDraftPicks: vi.fn(),
}));

vi.mock('~/models/draft-queue', () => ({
  clearAllQueuesForSeason: vi.fn(),
}));

vi.mock('~/models/draft-timer', () => ({
  deleteSeasonTimers: vi.fn(),
}));

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

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

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

  it('should only allow admins to reset draft', async () => {
    const userId = 'admin-user-id';
    
    vi.mocked(isUserAdmin).mockResolvedValue(true);

    const isAdmin = await isUserAdmin(userId);

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

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

    const isAdmin = await isUserAdmin(userId);

    expect(isAdmin).toBe(false);
    
    // Simulate action handler logic - should not proceed with reset
    if (!isAdmin) {
      expect(deleteAllDraftPicks).not.toHaveBeenCalled();
      expect(clearAllQueuesForSeason).not.toHaveBeenCalled();
      expect(updateSeason).not.toHaveBeenCalled();
    }
  });

  it('should reject commissioners who are not admins', async () => {
    const commissionerUserId = 'commissioner-user-id';
    
    // Commissioner but not admin
    vi.mocked(isUserAdmin).mockResolvedValue(false);

    const isAdmin = await isUserAdmin(commissionerUserId);

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

describe('Draft Reset - Delete Operations', () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  it('should delete all draft picks for a season', async () => {
    const seasonId = 'season-1';

    vi.mocked(deleteAllDraftPicks).mockResolvedValue(undefined);

    await deleteAllDraftPicks(seasonId);

    expect(deleteAllDraftPicks).toHaveBeenCalledWith(seasonId);
    expect(deleteAllDraftPicks).toHaveBeenCalledTimes(1);
  });

  it('should clear all draft queues for a season', async () => {
    const seasonId = 'season-1';

    vi.mocked(clearAllQueuesForSeason).mockResolvedValue(undefined);

    await clearAllQueuesForSeason(seasonId);

    expect(clearAllQueuesForSeason).toHaveBeenCalledWith(seasonId);
    expect(clearAllQueuesForSeason).toHaveBeenCalledTimes(1);
  });

  it('should delete all draft timers for a season', async () => {
    const seasonId = 'season-1';

    vi.mocked(deleteSeasonTimers).mockResolvedValue(undefined);

    await deleteSeasonTimers(seasonId);

    expect(deleteSeasonTimers).toHaveBeenCalledWith(seasonId);
    expect(deleteSeasonTimers).toHaveBeenCalledTimes(1);
  });

  it('should handle errors when deleting draft picks fails', async () => {
    const seasonId = 'season-1';
    const error = new Error('Database error');

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

    await expect(deleteAllDraftPicks(seasonId)).rejects.toThrow('Database error');
  });

  it('should handle errors when clearing queues fails', async () => {
    const seasonId = 'season-1';
    const error = new Error('Database error');

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

    await expect(clearAllQueuesForSeason(seasonId)).rejects.toThrow('Database error');
  });

  it('should handle errors when deleting timers fails', async () => {
    const seasonId = 'season-1';
    const error = new Error('Database error');

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

    await expect(deleteSeasonTimers(seasonId)).rejects.toThrow('Database error');
  });
});

describe('Draft Reset - Season Status Update', () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  it('should update season status to pre_draft', async () => {
    const seasonId = 'season-1';
    const mockUpdatedSeason = createMockSeason({ id: seasonId, status: 'pre_draft' });

    vi.mocked(updateSeason).mockResolvedValue(mockUpdatedSeason);

    const result = await updateSeason(seasonId, { status: 'pre_draft' });

    expect(updateSeason).toHaveBeenCalledWith(seasonId, { status: 'pre_draft' });
    expect(result.status).toBe('pre_draft');
  });

  it('should handle errors when updating season status fails', async () => {
    const seasonId = 'season-1';
    const error = new Error('Database error');

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

    await expect(updateSeason(seasonId, { status: 'pre_draft' })).rejects.toThrow('Database error');
  });
});

describe('Draft Reset - Status Validation', () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  it('should allow reset when season status is draft', () => {
    const seasonStatus = 'draft';
    const validStatuses = ['pre_draft', 'draft', 'completed', 'active'];

    expect(validStatuses.includes(seasonStatus)).toBe(true);
  });

  it('should allow reset when season status is completed', () => {
    const seasonStatus = 'completed';
    const validStatuses = ['pre_draft', 'draft', 'completed', 'active'];

    expect(validStatuses.includes(seasonStatus)).toBe(true);
  });

  it('should allow reset when season status is active', () => {
    const seasonStatus = 'active';
    const validStatuses = ['pre_draft', 'draft', 'completed', 'active'];

    expect(validStatuses.includes(seasonStatus)).toBe(true);
  });

  it('should allow reset when season status is pre_draft', () => {
    const seasonStatus = 'pre_draft';
    const validStatuses = ['pre_draft', 'draft', 'completed', 'active'];

    expect(validStatuses.includes(seasonStatus)).toBe(true);
  });
});

describe('Draft Reset - Complete Workflow', () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  it('should execute complete reset workflow in correct order', async () => {
    const seasonId = 'season-1';
    const userId = 'admin-user-id';

    // Step 1: Verify admin
    vi.mocked(isUserAdmin).mockResolvedValue(true);
    const isAdmin = await isUserAdmin(userId);
    expect(isAdmin).toBe(true);

    // Step 2: Delete draft picks
    vi.mocked(deleteAllDraftPicks).mockResolvedValue(undefined);
    await deleteAllDraftPicks(seasonId);
    expect(deleteAllDraftPicks).toHaveBeenCalledWith(seasonId);

    // Step 3: Clear draft queues
    vi.mocked(clearAllQueuesForSeason).mockResolvedValue(undefined);
    await clearAllQueuesForSeason(seasonId);
    expect(clearAllQueuesForSeason).toHaveBeenCalledWith(seasonId);

    // Step 4: Delete draft timers
    vi.mocked(deleteSeasonTimers).mockResolvedValue(undefined);
    await deleteSeasonTimers(seasonId);
    expect(deleteSeasonTimers).toHaveBeenCalledWith(seasonId);

    // Step 5: Update season status and reset draft state
    const mockUpdatedSeason = createMockSeason({ id: seasonId, status: 'pre_draft' });

    vi.mocked(updateSeason).mockResolvedValue(mockUpdatedSeason);
    const result = await updateSeason(seasonId, {
      status: 'pre_draft',
      currentPickNumber: null,
      draftStartedAt: null,
      draftPaused: false,
    });

    expect(result.status).toBe('pre_draft');
    expect(updateSeason).toHaveBeenCalledWith(seasonId, {
      status: 'pre_draft',
      currentPickNumber: null,
      draftStartedAt: null,
      draftPaused: false,
    });
  });

  it('should not proceed with reset if admin check fails', async () => {
    const userId = 'regular-user-id';

    vi.mocked(isUserAdmin).mockResolvedValue(false);
    const isAdmin = await isUserAdmin(userId);

    expect(isAdmin).toBe(false);

    // Should not call any reset functions
    expect(deleteAllDraftPicks).not.toHaveBeenCalled();
    expect(clearAllQueuesForSeason).not.toHaveBeenCalled();
    expect(deleteSeasonTimers).not.toHaveBeenCalled();
    expect(updateSeason).not.toHaveBeenCalled();
  });

  it('should handle partial failure gracefully', async () => {
    const seasonId = 'season-1';

    // First operation succeeds
    vi.mocked(deleteAllDraftPicks).mockResolvedValue(undefined);
    await deleteAllDraftPicks(seasonId);
    expect(deleteAllDraftPicks).toHaveBeenCalled();

    // Second operation fails
    const error = new Error('Queue clear failed');
    vi.mocked(clearAllQueuesForSeason).mockRejectedValue(error);

    await expect(clearAllQueuesForSeason(seasonId)).rejects.toThrow('Queue clear failed');

    // Should have attempted both operations
    expect(deleteAllDraftPicks).toHaveBeenCalledTimes(1);
    expect(clearAllQueuesForSeason).toHaveBeenCalledTimes(1);
  });
});

describe('Draft Reset - Draft Order Preservation', () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  it('should not delete or modify draft slots during reset', async () => {
    const seasonId = 'season-1';

    // Reset operations should not touch draft slots
    vi.mocked(deleteAllDraftPicks).mockResolvedValue(undefined);
    vi.mocked(clearAllQueuesForSeason).mockResolvedValue(undefined);

    await deleteAllDraftPicks(seasonId);
    await clearAllQueuesForSeason(seasonId);

    // Verify only picks and queues are deleted, not slots
    expect(deleteAllDraftPicks).toHaveBeenCalledWith(seasonId);
    expect(clearAllQueuesForSeason).toHaveBeenCalledWith(seasonId);
    
    // Draft slots should remain untouched (no delete function called for them)
  });

  it('should preserve draft order after reset', async () => {
    const seasonId = 'season-1';

    // Simulate that draft slots exist before reset
    const mockDraftSlots = [
      { id: 'slot-1', seasonId, teamId: 'team-1', draftOrder: 1 },
      { id: 'slot-2', seasonId, teamId: 'team-2', draftOrder: 2 },
      { id: 'slot-3', seasonId, teamId: 'team-3', draftOrder: 3 },
    ];

    // After reset, draft slots should still exist with same order
    // (This is implicit - we're not deleting them)
    vi.mocked(deleteAllDraftPicks).mockResolvedValue(undefined);
    vi.mocked(clearAllQueuesForSeason).mockResolvedValue(undefined);

    await deleteAllDraftPicks(seasonId);
    await clearAllQueuesForSeason(seasonId);

    // Draft order (slots) remain unchanged
    expect(mockDraftSlots).toHaveLength(3);
    expect(mockDraftSlots[0].draftOrder).toBe(1);
    expect(mockDraftSlots[1].draftOrder).toBe(2);
    expect(mockDraftSlots[2].draftOrder).toBe(3);
  });
});

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

  it('should handle reset when no draft picks exist', async () => {
    const seasonId = 'season-1';

    // No picks to delete, but operation should still succeed
    vi.mocked(deleteAllDraftPicks).mockResolvedValue(undefined);

    await deleteAllDraftPicks(seasonId);

    expect(deleteAllDraftPicks).toHaveBeenCalledWith(seasonId);
  });

  it('should handle reset when no draft queues exist', async () => {
    const seasonId = 'season-1';

    // No queues to clear, but operation should still succeed
    vi.mocked(clearAllQueuesForSeason).mockResolvedValue(undefined);

    await clearAllQueuesForSeason(seasonId);

    expect(clearAllQueuesForSeason).toHaveBeenCalledWith(seasonId);
  });

  it('should handle invalid season ID gracefully', async () => {
    const invalidSeasonId = 'invalid-season-id';
    const error = new Error('Season not found');

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

    await expect(updateSeason(invalidSeasonId, { status: 'pre_draft' })).rejects.toThrow('Season not found');
  });

  it('should handle concurrent reset attempts', async () => {
    const seasonId = 'season-1';

    vi.mocked(deleteAllDraftPicks).mockResolvedValue(undefined);
    vi.mocked(clearAllQueuesForSeason).mockResolvedValue(undefined);

    // Simulate two concurrent reset attempts
    const reset1 = deleteAllDraftPicks(seasonId);
    const reset2 = deleteAllDraftPicks(seasonId);

    await Promise.all([reset1, reset2]);

    // Both should complete (database should handle concurrency)
    expect(deleteAllDraftPicks).toHaveBeenCalledTimes(2);
  });
});

describe('Draft Reset - Data Integrity', () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  it('should ensure all picks are deleted before updating status', async () => {
    const seasonId = 'season-1';
    const callOrder: string[] = [];

    vi.mocked(deleteAllDraftPicks).mockImplementation(async () => {
      callOrder.push('deleteAllDraftPicks');
    });

    vi.mocked(clearAllQueuesForSeason).mockImplementation(async () => {
      callOrder.push('clearAllQueuesForSeason');
    });

    vi.mocked(deleteSeasonTimers).mockImplementation(async () => {
      callOrder.push('deleteSeasonTimers');
    });

    vi.mocked(updateSeason).mockImplementation(async () => {
      callOrder.push('updateSeason');
      return createMockSeason({ id: seasonId, status: 'pre_draft' });
    });

    // Execute in correct order
    await deleteAllDraftPicks(seasonId);
    await clearAllQueuesForSeason(seasonId);
    await deleteSeasonTimers(seasonId);
    await updateSeason(seasonId, {
      status: 'pre_draft',
      currentPickNumber: null,
      draftStartedAt: null,
      draftPaused: false,
    });

    // Verify order
    expect(callOrder).toEqual([
      'deleteAllDraftPicks',
      'clearAllQueuesForSeason',
      'deleteSeasonTimers',
      'updateSeason',
    ]);
  });

  it('should maintain referential integrity after reset', async () => {
    const seasonId = 'season-1';

    // All operations reference the same season
    vi.mocked(deleteAllDraftPicks).mockResolvedValue(undefined);
    vi.mocked(clearAllQueuesForSeason).mockResolvedValue(undefined);
    vi.mocked(deleteSeasonTimers).mockResolvedValue(undefined);
    vi.mocked(updateSeason).mockResolvedValue(
      createMockSeason({ id: seasonId, status: 'pre_draft' })
    );

    await deleteAllDraftPicks(seasonId);
    await clearAllQueuesForSeason(seasonId);
    await deleteSeasonTimers(seasonId);
    await updateSeason(seasonId, {
      status: 'pre_draft',
      currentPickNumber: null,
      draftStartedAt: null,
      draftPaused: false,
    });

    // All operations used the same season ID
    expect(deleteAllDraftPicks).toHaveBeenCalledWith(seasonId);
    expect(clearAllQueuesForSeason).toHaveBeenCalledWith(seasonId);
    expect(deleteSeasonTimers).toHaveBeenCalledWith(seasonId);
    expect(updateSeason).toHaveBeenCalledWith(seasonId, {
      status: 'pre_draft',
      currentPickNumber: null,
      draftStartedAt: null,
      draftPaused: false,
    });
  });
});