/**
 * Edge Case and Error Scenario Tests for Video Upload
 * Tests boundary conditions, network failures, and timeout scenarios
 */

import { fileStorageService } from '~/features/storage/fileStorage.service';
import { AudioFile } from '~/features/storage/storage.types';
import NetInfo from '@react-native-community/netinfo';

// Mock dependencies
jest.mock('@react-native-community/netinfo');
jest.mock('~/features/auth/services/tokenManager');
jest.mock('~/features/credits/creditService');

describe('Video Upload Edge Cases and Error Scenarios', () => {
  beforeEach(() => {
    jest.clearAllMocks();
  });

  describe('Network failure scenarios', () => {
    it('should handle network disconnection during upload', async () => {
      const mockVideoFile: AudioFile = {
        id: 'test-video-1',
        uri: 'file:///test/video.mp4',
        filename: 'test-video.mp4',
        duration: 180,
        createdAt: new Date()
      };

      // Mock network as disconnected
      (NetInfo.fetch as jest.Mock).mockResolvedValue({
        isConnected: false,
        isInternetReachable: false
      });

      const result = await fileStorageService.uploadForTranscription(
        mockVideoFile,
        undefined,
        undefined,
        undefined,
        undefined,
        undefined,
        undefined,
        false, // don't skip offline queue
        false,
        'video'
      );

      expect(result).toMatchObject({
        status: 'pending',
        message: expect.stringContaining('queued')
      });
    });

    it('should retry on network timeout', async () => {
      const mockVideoFile: AudioFile = {
        id: 'test-video-2',
        uri: 'file:///test/large-video.mp4',
        filename: 'large-video.mp4',
        duration: 600,
        createdAt: new Date()
      };

      // Mock fetch to timeout
      global.fetch = jest.fn().mockImplementation(() => {
        return new Promise((resolve) => {
          setTimeout(() => {
            throw new Error('Network timeout');
          }, 600000); // Simulate 10-minute timeout
        });
      });

      await expect(
        fileStorageService.uploadForTranscription(
          mockVideoFile,
          undefined,
          undefined,
          undefined,
          undefined,
          undefined,
          undefined,
          true,
          false,
          'video'
        )
      ).rejects.toThrow();
    });

    it('should handle intermittent connectivity', async () => {
      const mockVideoFile: AudioFile = {
        id: 'test-video-3',
        uri: 'file:///test/video.mp4',
        filename: 'video.mp4',
        duration: 120,
        createdAt: new Date()
      };

      let callCount = 0;
      (NetInfo.fetch as jest.Mock).mockImplementation(() => {
        callCount++;
        return Promise.resolve({
          isConnected: callCount % 2 === 0, // Alternate between connected and disconnected
          isInternetReachable: callCount % 2 === 0
        });
      });

      // Should eventually succeed or queue based on final state
      const result = await fileStorageService.uploadForTranscription(
        mockVideoFile,
        undefined,
        undefined,
        undefined,
        undefined,
        undefined,
        undefined,
        false,
        false,
        'video'
      );

      expect(result).toBeDefined();
    });

    it('should handle DNS resolution failures', async () => {
      const mockVideoFile: AudioFile = {
        id: 'test-video-4',
        uri: 'file:///test/video.mp4',
        filename: 'video.mp4',
        duration: 120,
        createdAt: new Date()
      };

      global.fetch = jest.fn().mockRejectedValue(new Error('ENOTFOUND: DNS lookup failed'));

      await expect(
        fileStorageService.uploadForTranscription(
          mockVideoFile,
          undefined,
          undefined,
          undefined,
          undefined,
          undefined,
          undefined,
          true,
          false,
          'video'
        )
      ).rejects.toThrow();
    });
  });

  describe('File corruption scenarios', () => {
    it('should detect corrupted video file header', async () => {
      const mockCorruptedFile: AudioFile = {
        id: 'corrupted-video',
        uri: 'file:///test/corrupted.mp4',
        filename: 'corrupted.mp4',
        duration: 0, // Zero duration indicates corruption
        createdAt: new Date()
      };

      // Should fail validation before upload
      await expect(
        fileStorageService.uploadForTranscription(
          mockCorruptedFile,
          undefined,
          undefined,
          undefined,
          undefined,
          undefined,
          undefined,
          true,
          false,
          'video'
        )
      ).rejects.toThrow();
    });

    it('should handle partially downloaded video files', async () => {
      const mockPartialFile: AudioFile = {
        id: 'partial-video',
        uri: 'file:///test/partial.mp4',
        filename: 'partial.mp4.part',
        duration: 120,
        createdAt: new Date()
      };

      // Service should validate file completeness
      await expect(
        fileStorageService.uploadForTranscription(
          mockPartialFile,
          undefined,
          undefined,
          undefined,
          undefined,
          undefined,
          undefined,
          true,
          false,
          'video'
        )
      ).rejects.toThrow();
    });

    it('should handle video files with missing codec', async () => {
      const mockInvalidCodec: AudioFile = {
        id: 'invalid-codec',
        uri: 'file:///test/invalid-codec.mp4',
        filename: 'invalid-codec.mp4',
        duration: 180,
        createdAt: new Date()
      };

      // The audio microservice should detect and handle this
      global.fetch = jest.fn().mockResolvedValue({
        ok: false,
        status: 422,
        text: () => Promise.resolve('Unsupported codec')
      } as Response);

      await expect(
        fileStorageService.uploadForTranscription(
          mockInvalidCodec,
          undefined,
          undefined,
          undefined,
          undefined,
          undefined,
          undefined,
          true,
          false,
          'video'
        )
      ).rejects.toThrow();
    });
  });

  describe('File size boundary tests', () => {
    it('should handle extremely small video files', async () => {
      const mockTinyFile: AudioFile = {
        id: 'tiny-video',
        uri: 'file:///test/tiny.mp4',
        filename: 'tiny.mp4',
        duration: 1, // 1 second
        createdAt: new Date(),
        size: 1024 // 1KB
      };

      const result = await fileStorageService.uploadForTranscription(
        mockTinyFile,
        undefined,
        undefined,
        undefined,
        undefined,
        undefined,
        undefined,
        true,
        false,
        'video'
      );

      expect(result).toBeDefined();
    });

    it('should handle extremely large video files', async () => {
      const mockLargeFile: AudioFile = {
        id: 'huge-video',
        uri: 'file:///test/huge.mp4',
        filename: 'huge.mp4',
        duration: 86400, // 24 hours
        createdAt: new Date(),
        size: 10 * 1024 * 1024 * 1024 // 10GB
      };

      // Should use batch processing for large files
      const result = await fileStorageService.uploadForTranscription(
        mockLargeFile,
        undefined,
        undefined,
        undefined,
        undefined,
        undefined,
        undefined,
        true,
        false,
        'video'
      );

      expect(result).toBeDefined();
      // Should trigger batch processing path
    });

    it('should handle file at exact size limit', async () => {
      const mockBoundaryFile: AudioFile = {
        id: 'boundary-video',
        uri: 'file:///test/boundary.mp4',
        filename: 'boundary.mp4',
        duration: 6900, // 115 minutes (boundary for fast/batch)
        createdAt: new Date(),
        size: 100 * 1024 * 1024 // 100MB
      };

      const result = await fileStorageService.uploadForTranscription(
        mockBoundaryFile,
        undefined,
        undefined,
        undefined,
        undefined,
        undefined,
        undefined,
        true,
        false,
        'video'
      );

      expect(result).toBeDefined();
    });
  });

  describe('Special character handling', () => {
    it('should handle filenames with unicode characters', async () => {
      const mockUnicodeFile: AudioFile = {
        id: 'unicode-video',
        uri: 'file:///test/视频文件.mp4',
        filename: '视频文件.mp4',
        duration: 120,
        createdAt: new Date()
      };

      const result = await fileStorageService.uploadForTranscription(
        mockUnicodeFile,
        undefined,
        undefined,
        undefined,
        undefined,
        undefined,
        undefined,
        true,
        false,
        'video'
      );

      expect(result).toBeDefined();
    });

    it('should handle filenames with special characters', async () => {
      const specialNames = [
        'video (1).mp4',
        'my-video_test[HD].mp4',
        'video@2025-01-01.mp4',
        'test & demo.mp4'
      ];

      for (const filename of specialNames) {
        const mockFile: AudioFile = {
          id: `special-${filename}`,
          uri: `file:///test/${filename}`,
          filename: filename,
          duration: 120,
          createdAt: new Date()
        };

        const result = await fileStorageService.uploadForTranscription(
          mockFile,
          undefined,
          undefined,
          undefined,
          undefined,
          undefined,
          undefined,
          true,
          false,
          'video'
        );

        expect(result).toBeDefined();
      }
    });

    it('should sanitize path traversal attempts', async () => {
      const maliciousPaths = [
        '../../../etc/passwd.mp4',
        '..\\..\\..\\windows\\system32\\video.mp4',
        'test/../../other-user/video.mp4'
      ];

      for (const path of maliciousPaths) {
        const mockFile: AudioFile = {
          id: 'malicious',
          uri: path,
          filename: path,
          duration: 120,
          createdAt: new Date()
        };

        // Should be rejected by service layer
        await expect(
          fileStorageService.uploadForTranscription(
            mockFile,
            undefined,
            undefined,
            undefined,
            undefined,
            undefined,
            undefined,
            true,
            false,
            'video'
          )
        ).rejects.toThrow();
      }
    });
  });

  describe('Concurrent upload scenarios', () => {
    it('should handle multiple simultaneous video uploads', async () => {
      const uploadPromises = Array(10).fill(null).map((_, index) => {
        const mockFile: AudioFile = {
          id: `concurrent-video-${index}`,
          uri: `file:///test/video-${index}.mp4`,
          filename: `video-${index}.mp4`,
          duration: 120 + (index * 10),
          createdAt: new Date()
        };

        return fileStorageService.uploadForTranscription(
          mockFile,
          undefined,
          undefined,
          undefined,
          undefined,
          undefined,
          undefined,
          true,
          false,
          'video'
        );
      });

      const results = await Promise.allSettled(uploadPromises);

      // All uploads should either succeed or fail gracefully
      expect(results).toHaveLength(10);
      results.forEach(result => {
        expect(result.status).toMatch(/fulfilled|rejected/);
      });
    });

    it('should handle upload queue overflow', async () => {
      // Simulate many uploads queued offline
      const queuePromises = Array(100).fill(null).map((_, index) => {
        const mockFile: AudioFile = {
          id: `queue-video-${index}`,
          uri: `file:///test/video-${index}.mp4`,
          filename: `video-${index}.mp4`,
          duration: 120,
          createdAt: new Date()
        };

        // Mock network as offline
        (NetInfo.fetch as jest.Mock).mockResolvedValue({
          isConnected: false,
          isInternetReachable: false
        });

        return fileStorageService.uploadForTranscription(
          mockFile,
          undefined,
          undefined,
          undefined,
          undefined,
          undefined,
          undefined,
          false, // don't skip queue
          false,
          'video'
        );
      });

      const results = await Promise.allSettled(queuePromises);

      // All should be queued
      results.forEach(result => {
        if (result.status === 'fulfilled') {
          expect(result.value.status).toBe('pending');
        }
      });
    });
  });

  describe('Memory and resource constraints', () => {
    it('should handle low memory conditions', async () => {
      const mockLargeFile: AudioFile = {
        id: 'memory-test',
        uri: 'file:///test/large-video.mp4',
        filename: 'large-video.mp4',
        duration: 3600,
        createdAt: new Date(),
        size: 2 * 1024 * 1024 * 1024 // 2GB
      };

      // Monitor memory usage during upload
      const initialMemory = (performance as any).memory?.usedJSHeapSize || 0;

      await fileStorageService.uploadForTranscription(
        mockLargeFile,
        undefined,
        undefined,
        undefined,
        undefined,
        undefined,
        undefined,
        true,
        false,
        'video'
      );

      const finalMemory = (performance as any).memory?.usedJSHeapSize || 0;
      const memoryIncrease = finalMemory - initialMemory;

      // Memory increase should be reasonable (less than 100MB for the upload logic)
      expect(memoryIncrease).toBeLessThan(100 * 1024 * 1024);
    });

    it('should clean up resources after upload failure', async () => {
      const mockFile: AudioFile = {
        id: 'cleanup-test',
        uri: 'file:///test/video.mp4',
        filename: 'video.mp4',
        duration: 120,
        createdAt: new Date()
      };

      global.fetch = jest.fn().mockRejectedValue(new Error('Upload failed'));

      await expect(
        fileStorageService.uploadForTranscription(
          mockFile,
          undefined,
          undefined,
          undefined,
          undefined,
          undefined,
          undefined,
          true,
          false,
          'video'
        )
      ).rejects.toThrow();

      // Verify resources are cleaned up (no hanging promises, file handles, etc.)
    });
  });

  describe('Timeout scenarios', () => {
    it('should timeout after configured duration', async () => {
      const mockFile: AudioFile = {
        id: 'timeout-test',
        uri: 'file:///test/video.mp4',
        filename: 'video.mp4',
        duration: 120,
        createdAt: new Date()
      };

      // Mock very slow upload
      global.fetch = jest.fn().mockImplementation(() => {
        return new Promise((resolve) => {
          setTimeout(() => {
            resolve({
              ok: true,
              json: () => Promise.resolve({ success: true })
            } as Response);
          }, 700000); // 11+ minutes - should timeout at 10 minutes
        });
      });

      await expect(
        fileStorageService.uploadForTranscription(
          mockFile,
          undefined,
          undefined,
          undefined,
          undefined,
          undefined,
          undefined,
          true,
          false,
          'video'
        )
      ).rejects.toThrow(/timeout/i);
    });

    it('should handle slow network gracefully', async () => {
      const mockFile: AudioFile = {
        id: 'slow-network',
        uri: 'file:///test/video.mp4',
        filename: 'video.mp4',
        duration: 120,
        createdAt: new Date()
      };

      // Simulate slow but successful upload
      global.fetch = jest.fn().mockImplementation(() => {
        return new Promise((resolve) => {
          setTimeout(() => {
            resolve({
              ok: true,
              json: () => Promise.resolve({ success: true })
            } as Response);
          }, 5000); // 5 seconds - should succeed
        });
      });

      const result = await fileStorageService.uploadForTranscription(
        mockFile,
        undefined,
        undefined,
        undefined,
        undefined,
        undefined,
        undefined,
        true,
        false,
        'video'
      );

      expect(result).toBeDefined();
    });
  });

  describe('Video format edge cases', () => {
    it('should handle videos with no audio track', async () => {
      const mockSilentVideo: AudioFile = {
        id: 'silent-video',
        uri: 'file:///test/silent-video.mp4',
        filename: 'silent-video.mp4',
        duration: 120,
        createdAt: new Date()
      };

      // Should fail at audio microservice level
      global.fetch = jest.fn().mockResolvedValue({
        ok: false,
        status: 422,
        text: () => Promise.resolve('No audio track found')
      } as Response);

      await expect(
        fileStorageService.uploadForTranscription(
          mockSilentVideo,
          undefined,
          undefined,
          undefined,
          undefined,
          undefined,
          undefined,
          true,
          false,
          'video'
        )
      ).rejects.toThrow();
    });

    it('should handle videos with multiple audio tracks', async () => {
      const mockMultiAudioVideo: AudioFile = {
        id: 'multi-audio',
        uri: 'file:///test/multi-audio.mp4',
        filename: 'multi-audio.mp4',
        duration: 120,
        createdAt: new Date()
      };

      // Should use first audio track
      const result = await fileStorageService.uploadForTranscription(
        mockMultiAudioVideo,
        undefined,
        undefined,
        undefined,
        undefined,
        undefined,
        undefined,
        true,
        false,
        'video'
      );

      expect(result).toBeDefined();
    });

    it('should handle videos with variable frame rate', async () => {
      const mockVfrVideo: AudioFile = {
        id: 'vfr-video',
        uri: 'file:///test/vfr-video.mp4',
        filename: 'vfr-video.mp4',
        duration: 120,
        createdAt: new Date()
      };

      const result = await fileStorageService.uploadForTranscription(
        mockVfrVideo,
        undefined,
        undefined,
        undefined,
        undefined,
        undefined,
        undefined,
        true,
        false,
        'video'
      );

      expect(result).toBeDefined();
    });

    it('should handle videos with unusual aspect ratios', async () => {
      const aspectRatios = [
        'portrait-9-16.mp4',
        'square-1-1.mp4',
        'ultrawide-21-9.mp4',
        'vertical-4-5.mp4'
      ];

      for (const filename of aspectRatios) {
        const mockFile: AudioFile = {
          id: `aspect-ratio-${filename}`,
          uri: `file:///test/${filename}`,
          filename: filename,
          duration: 120,
          createdAt: new Date()
        };

        const result = await fileStorageService.uploadForTranscription(
          mockFile,
          undefined,
          undefined,
          undefined,
          undefined,
          undefined,
          undefined,
          true,
          false,
          'video'
        );

        expect(result).toBeDefined();
      }
    });
  });
});