import { describe, it, expect, vi } from 'vitest'
import { SttError, createErrorHandler, ErrorRecovery } from '../../src/core/stt-error'

describe('SttError', () => {
  describe('constructor', () => {
    it('should create error with code and message', () => {
      const error = new SttError('NOT_INITIALIZED', 'SDK not initialized')

      expect(error).toBeInstanceOf(SttError)
      expect(error.name).toBe('SttError')
      expect(error.code).toBe('NOT_INITIALIZED')
      expect(error.message).toBe('SDK not initialized')
      expect(error.timestamp).toBeGreaterThan(0)
      expect(error.details).toBeUndefined()
    })

    it('should create error with details', () => {
      const details = { userId: 'test-user', channel: 'test-channel' }
      const error = new SttError('INVALID_CONFIG', 'Invalid configuration', details)

      expect(error.details).toEqual(details)
    })
  })

  describe('fromError', () => {
    it('should return SttError instance if already SttError', () => {
      const originalError = new SttError('NETWORK_ERROR', 'Network failed')
      const result = SttError.fromError(originalError)

      expect(result).toBe(originalError)
    })

    it('should convert Error to SttError', () => {
      const originalError = new Error('Something went wrong')
      const result = SttError.fromError(originalError, 'UNKNOWN_ERROR')

      expect(result).toBeInstanceOf(SttError)
      expect(result.code).toBe('UNKNOWN_ERROR')
      expect(result.message).toBe('Something went wrong')
      expect(result.details?.originalError).toBe(originalError)
    })

    it('should handle non-Error objects', () => {
      const result = SttError.fromError('String error', 'NETWORK_ERROR')

      expect(result).toBeInstanceOf(SttError)
      expect(result.code).toBe('NETWORK_ERROR')
      expect(result.message).toBe('String error')
    })
  })

  describe('toJSON', () => {
    it('should serialize error to JSON', () => {
      const error = new SttError('NOT_INITIALIZED', 'SDK not initialized')
      const json = error.toJSON()

      expect(json).toEqual({
        name: 'SttError',
        code: 'NOT_INITIALIZED',
        message: 'SDK not initialized',
        timestamp: error.timestamp,
        details: undefined,
        stack: error.stack,
      })
    })
  })

  describe('toString', () => {
    it('should return formatted string', () => {
      const error = new SttError('NOT_INITIALIZED', 'SDK not initialized')
      const str = error.toString()

      expect(str).toBe('[NOT_INITIALIZED] SDK not initialized')
    })
  })
})

describe('createErrorHandler', () => {
  it('should create error handler without emitter', () => {
    const handler = createErrorHandler()
    const error = new Error('Test error')
    const result = handler(error)

    expect(result).toBeInstanceOf(SttError)
  })

  it('should create error handler with emitter', () => {
    const emitter = {
      emit: vi.fn(),
    }
    const handler = createErrorHandler(emitter)
    const error = new Error('Test error')
    const result = handler(error)

    expect(result).toBeInstanceOf(SttError)
    expect(emitter.emit).toHaveBeenCalledWith('error', result)
  })

  it('should include context in details', () => {
    const handler = createErrorHandler()
    const error = new Error('Test error')
    const result = handler(error, 'test-context')

    expect(result.details?.context).toBe('test-context')
  })
})

describe('ErrorRecovery', () => {
  describe('retry', () => {
    it('should succeed on first attempt', async () => {
      const recovery = new ErrorRecovery()
      const operation = vi.fn().mockResolvedValue('success')

      const result = await recovery.retry(operation)

      expect(result).toBe('success')
      expect(operation).toHaveBeenCalledTimes(1)
    })

    it('should retry and succeed', async () => {
      const recovery = new ErrorRecovery()
      const operation = vi
        .fn()
        .mockRejectedValueOnce(new Error('First attempt failed'))
        .mockResolvedValueOnce('success')

      const result = await recovery.retry(operation)

      expect(result).toBe('success')
      expect(operation).toHaveBeenCalledTimes(2)
    })

    it('should fail after max retries', async () => {
      const recovery = new ErrorRecovery(2, 10)
      const operation = vi.fn().mockRejectedValue(new Error('Always fails'))

      await expect(recovery.retry(operation)).rejects.toThrow('Always fails')
      expect(operation).toHaveBeenCalledTimes(2) // Initial + 1 retry (maxRetries=2 means 2 total attempts)
    })

    it('should respect shouldRetry function', async () => {
      const recovery = new ErrorRecovery()
      const operation = vi.fn().mockRejectedValue(new SttError('NETWORK_ERROR', 'Network failed'))
      const shouldRetry = vi.fn().mockReturnValue(false)

      await expect(recovery.retry(operation, shouldRetry)).rejects.toThrow(SttError)
      expect(operation).toHaveBeenCalledTimes(1)
      expect(shouldRetry).toHaveBeenCalledTimes(1)
    })
  })
})