import * as fs from 'fs'
import * as os from 'os'
import { exec } from 'child_process'
import { convertGifToVideo } from '../gif-converter'

// Mock dependencies
jest.mock('fs')
jest.mock('os')
jest.mock('child_process')

describe('GIF Converter', () => {
	beforeEach(() => {
		jest.clearAllMocks()
		;(os.tmpdir as jest.Mock).mockReturnValue('/tmp')
	})

	it('should convert GIF to video using ffmpeg', async () => {
		const mockStats = { size: 1024 * 1024 } // 1MB
		const mockStatSync = fs.statSync as jest.Mock
		mockStatSync.mockReturnValue(mockStats)

		const mockExecAsync = jest
			.fn()
			.mockResolvedValue({ stdout: '', stderr: '' })
		;(exec as unknown as jest.Mock).mockImplementation((cmd, cb) => {
			if (cb) cb(null, { stdout: '', stderr: '' })
			return { stdout: '', stderr: '' }
		})

		const result = await convertGifToVideo('test.gif')

		expect(exec).toHaveBeenCalledWith(
			expect.stringContaining('ffmpeg -i "test.gif"'),
			expect.any(Function)
		)
		expect(mockStatSync).toHaveBeenCalled()
		expect(result).toMatch(/^\/tmp\/converted-\d+-\w+\.mp4$/)
	})

	it('should return temporary file path without cleanup', async () => {
		const mockStats = { size: 1024 * 1024 } // 1MB
		const mockStatSync = fs.statSync as jest.Mock
		mockStatSync.mockReturnValue(mockStats)

		const mockUnlinkSync = fs.unlinkSync as jest.Mock
		mockUnlinkSync.mockImplementation(() => {})

		const mockExecAsync = jest
			.fn()
			.mockResolvedValue({ stdout: '', stderr: '' })
		;(exec as unknown as jest.Mock).mockImplementation((cmd, cb) => {
			if (cb) cb(null, { stdout: '', stderr: '' })
			return { stdout: '', stderr: '' }
		})

		const result = await convertGifToVideo('test.gif')

		// Should NOT clean up the file - that's the caller's responsibility
		expect(mockUnlinkSync).not.toHaveBeenCalled()
		expect(result).toMatch(/^\/tmp\/converted-\d+-\w+\.mp4$/)
	})

	it('should handle ffmpeg errors', async () => {
		const mockExecAsync = jest.fn().mockRejectedValue(new Error('ffmpeg error'))
		;(exec as unknown as jest.Mock).mockImplementation((cmd, cb) => {
			if (cb) cb(new Error('ffmpeg error'), { stdout: '', stderr: '' })
			return { stdout: '', stderr: '' }
		})

		await expect(convertGifToVideo('test.gif')).rejects.toThrow('ffmpeg error')
	})
})