import { describe, it, expect, vi, beforeEach } from 'vitest';
import axios from 'axios';
import {
  makeMove,
  isPromotionRequired,
  getPromotionRequirement,
  createPromotionMove,
  type GameResponse,
  type PromotionRequirement,
  type GameState
} from './api';

// Mock axios
vi.mock('axios');
const mockedAxios = vi.mocked(axios);

describe('API Service - Promotion Support', () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  const mockGameState: GameState = {
    fen: 'rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1',
    turn: 'white',
    game_state: 'active',
    legal_moves: ['e2e4', 'e2e3'],
    in_check: false,
    move_count: 1
  };

  describe('makeMove function', () => {
    it('should make a normal move successfully', async () => {
      const mockResponse: GameResponse = {
        status: 'success',
        board_state: mockGameState,
        player_move: 'e2e4'
      };

      mockedAxios.post.mockResolvedValueOnce({ data: mockResponse });

      const result = await makeMove('e2e4');

      expect(mockedAxios.post).toHaveBeenCalledWith('/api/game/move', { move: 'e2e4' });
      expect(result).toEqual(mockResponse);
    });

    it('should make a promotion move with piece specified', async () => {
      const mockResponse: GameResponse = {
        status: 'success',
        board_state: mockGameState,
        player_move: 'e7e8q'
      };

      mockedAxios.post.mockResolvedValueOnce({ data: mockResponse });

      const result = await makeMove('e7e8', 'queen');

      expect(mockedAxios.post).toHaveBeenCalledWith('/api/game/move', { move: 'e7e8q' });
      expect(result).toEqual(mockResponse);
    });

    it('should handle promotion required error response', async () => {
      const errorResponse = {
        status: 'promotion_required',
        message: 'Pawn promotion requires piece selection',
        board_state: mockGameState,
        promotion_details: {
          from: 'e7',
          to: 'e8',
          available_pieces: ['queen', 'rook', 'bishop', 'knight']
        }
      };

      const axiosError = {
        isAxiosError: true,
        response: {
          status: 400,
          data: errorResponse
        }
      };

      mockedAxios.post.mockRejectedValueOnce(axiosError);
      mockedAxios.isAxiosError.mockReturnValueOnce(true);

      const result = await makeMove('e7e8');

      expect(result.status).toBe('promotion_required');
      expect(result.promotion_required).toEqual({
        from: 'e7',
        to: 'e8',
        available_pieces: ['queen', 'rook', 'bishop', 'knight']
      });
    });

    it('should handle promotion required error with minimal data', async () => {
      const errorResponse = {
        status: 'promotion_required',
        message: 'Pawn promotion requires piece selection'
      };

      const axiosError = {
        isAxiosError: true,
        response: {
          status: 400,
          data: errorResponse
        }
      };

      mockedAxios.post.mockRejectedValueOnce(axiosError);
      mockedAxios.isAxiosError.mockReturnValueOnce(true);

      const result = await makeMove('e7e8');

      expect(result.status).toBe('promotion_required');
      expect(result.promotion_required).toEqual({
        from: 'e7',
        to: 'e8',
        available_pieces: ['queen', 'rook', 'bishop', 'knight']
      });
    });

    it('should re-throw non-promotion errors', async () => {
      const axiosError = {
        isAxiosError: true,
        response: {
          status: 500,
          data: { message: 'Internal server error' }
        }
      };

      mockedAxios.post.mockRejectedValueOnce(axiosError);
      mockedAxios.isAxiosError.mockReturnValueOnce(true);

      await expect(makeMove('e2e4')).rejects.toEqual(axiosError);
    });

    it('should re-throw non-axios errors', async () => {
      const networkError = new Error('Network error');

      mockedAxios.post.mockRejectedValueOnce(networkError);
      mockedAxios.isAxiosError.mockReturnValueOnce(false);

      await expect(makeMove('e2e4')).rejects.toEqual(networkError);
    });

    it('should handle different promotion pieces correctly', async () => {
      const testCases = [
        { piece: 'queen', expected: 'e7e8q' },
        { piece: 'rook', expected: 'e7e8r' },
        { piece: 'bishop', expected: 'e7e8b' },
        { piece: 'knight', expected: 'e7e8n' }
      ] as const;

      for (const testCase of testCases) {
        const mockResponse: GameResponse = {
          status: 'success',
          board_state: mockGameState,
          player_move: testCase.expected
        };

        mockedAxios.post.mockResolvedValueOnce({ data: mockResponse });

        await makeMove('e7e8', testCase.piece);

        expect(mockedAxios.post).toHaveBeenCalledWith('/api/game/move', { move: testCase.expected });
      }
    });
  });

  describe('isPromotionRequired function', () => {
    it('should return true when promotion is required', () => {
      const response: GameResponse = {
        status: 'promotion_required',
        board_state: mockGameState,
        promotion_required: {
          from: 'e7',
          to: 'e8',
          available_pieces: ['queen', 'rook', 'bishop', 'knight']
        }
      };

      expect(isPromotionRequired(response)).toBe(true);
    });

    it('should return false when promotion is not required', () => {
      const response: GameResponse = {
        status: 'success',
        board_state: mockGameState
      };

      expect(isPromotionRequired(response)).toBe(false);
    });

    it('should return false when status is promotion_required but no promotion_required field', () => {
      const response: GameResponse = {
        status: 'promotion_required',
        board_state: mockGameState
      };

      expect(isPromotionRequired(response)).toBe(false);
    });
  });

  describe('getPromotionRequirement function', () => {
    it('should return promotion requirement when present', () => {
      const promotionReq: PromotionRequirement = {
        from: 'e7',
        to: 'e8',
        available_pieces: ['queen', 'rook', 'bishop', 'knight']
      };

      const response: GameResponse = {
        status: 'promotion_required',
        board_state: mockGameState,
        promotion_required: promotionReq
      };

      expect(getPromotionRequirement(response)).toEqual(promotionReq);
    });

    it('should return null when no promotion requirement', () => {
      const response: GameResponse = {
        status: 'success',
        board_state: mockGameState
      };

      expect(getPromotionRequirement(response)).toBeNull();
    });
  });

  describe('createPromotionMove function', () => {
    it('should create correct UCI notation for different pieces', () => {
      expect(createPromotionMove('e7', 'e8', 'queen')).toBe('e7e8q');
      expect(createPromotionMove('e7', 'e8', 'rook')).toBe('e7e8r');
      expect(createPromotionMove('e7', 'e8', 'bishop')).toBe('e7e8b');
      expect(createPromotionMove('e7', 'e8', 'knight')).toBe('e7e8n');
    });

    it('should handle different squares correctly', () => {
      expect(createPromotionMove('a7', 'a8', 'queen')).toBe('a7a8q');
      expect(createPromotionMove('h2', 'h1', 'rook')).toBe('h2h1r');
      expect(createPromotionMove('d7', 'd8', 'bishop')).toBe('d7d8b');
    });
  });

  describe('Integration scenarios', () => {
    it('should handle complete promotion flow', async () => {
      // First call - promotion required
      const promotionRequiredError = {
        isAxiosError: true,
        response: {
          status: 400,
          data: {
            status: 'promotion_required',
            message: 'Pawn promotion requires piece selection',
            promotion_details: {
              from: 'e7',
              to: 'e8',
              available_pieces: ['queen', 'rook', 'bishop', 'knight']
            }
          }
        }
      };

      mockedAxios.post.mockRejectedValueOnce(promotionRequiredError);
      mockedAxios.isAxiosError.mockReturnValueOnce(true);

      const firstResult = await makeMove('e7e8');
      expect(isPromotionRequired(firstResult)).toBe(true);

      const promotionReq = getPromotionRequirement(firstResult);
      expect(promotionReq).toBeTruthy();
      expect(promotionReq!.available_pieces).toContain('queen');

      // Second call - with promotion piece
      const successResponse: GameResponse = {
        status: 'success',
        board_state: mockGameState,
        player_move: 'e7e8q'
      };

      mockedAxios.post.mockResolvedValueOnce({ data: successResponse });

      const secondResult = await makeMove('e7e8', 'queen');
      expect(secondResult.status).toBe('success');
      expect(secondResult.player_move).toBe('e7e8q');
    });
  });
});