// tests/providers/factory.test.ts
import { describe, it, expect, vi, afterEach } from 'vitest'
import { createProvider, getProviderForModel } from '../../src/providers/factory.js'
import type { MagpieConfig } from '../../src/config/types.js'

describe('Provider Factory', () => {
  afterEach(() => {
    vi.unstubAllEnvs()
  })

  const mockConfig: MagpieConfig = {
    providers: {
      anthropic: { api_key: 'ant-key' },
      openai: { api_key: 'oai-key' },
      'claude-code': { enabled: true },
      'codex-cli': { enabled: true }
    },
    defaults: { max_rounds: 3, output_format: 'markdown' },
    reviewers: {},
    summarizer: { model: 'claude-sonnet-4-20250514', prompt: '' },
    analyzer: { model: 'claude-sonnet-4-20250514', prompt: '' }
  }

  describe('getProviderForModel', () => {
    it('should return anthropic for claude models', () => {
      expect(getProviderForModel('claude-sonnet-4-20250514')).toBe('anthropic')
      expect(getProviderForModel('claude-3-opus-20240229')).toBe('anthropic')
    })

    it('should return openai for gpt models', () => {
      expect(getProviderForModel('gpt-4o')).toBe('openai')
      expect(getProviderForModel('gpt-4-turbo')).toBe('openai')
    })

    it('should return google for gemini models', () => {
      expect(getProviderForModel('gemini-pro')).toBe('google')
    })

    it('should return claude-code for claude-code model', () => {
      expect(getProviderForModel('claude-code')).toBe('claude-code')
    })

    it('should return codex-cli for codex-cli model', () => {
      expect(getProviderForModel('codex-cli')).toBe('codex-cli')
    })

    it('should return opencode-cli for opencode-cli model (with and without :model suffix)', () => {
      expect(getProviderForModel('opencode-cli')).toBe('opencode-cli')
      expect(getProviderForModel('opencode-cli:openrouter/anthropic/claude-sonnet-4')).toBe('opencode-cli')
    })

    it('should return openrouter for openrouter/ prefixed models', () => {
      expect(getProviderForModel('openrouter/anthropic/claude-3.5-sonnet')).toBe('openrouter')
      expect(getProviderForModel('openrouter/meta-llama/llama-3-70b-instruct')).toBe('openrouter')
      expect(getProviderForModel('openrouter/openai/gpt-4o')).toBe('openrouter')
    })
  })

  describe('createProvider', () => {
    it('should create anthropic provider', () => {
      const provider = createProvider('claude-sonnet-4-20250514', mockConfig)
      expect(provider.name).toBe('anthropic')
    })

    it('should create openai provider', () => {
      const provider = createProvider('gpt-4o', mockConfig)
      expect(provider.name).toBe('openai')
    })

    it('should throw for missing provider config', () => {
      const configWithoutOpenAI = { ...mockConfig, providers: { anthropic: { api_key: 'key' } } }
      expect(() => createProvider('gpt-4o', configWithoutOpenAI)).toThrow()
    })

    it('should create claude-code provider', () => {
      const provider = createProvider('claude-code', mockConfig)
      expect(provider.name).toBe('claude-code')
    })

    it('should create gemini provider', () => {
      const configWithGoogle = {
        ...mockConfig,
        providers: { ...mockConfig.providers, google: { api_key: 'google-key' } }
      }
      const provider = createProvider('gemini-pro', configWithGoogle)
      expect(provider.name).toBe('gemini')
    })

    it('should create codex-cli provider', () => {
      const provider = createProvider('codex-cli', mockConfig)
      expect(provider.name).toBe('codex-cli')
    })

    it('should create opencode-cli provider with no extra config', () => {
      const provider = createProvider('opencode-cli', mockConfig)
      expect(provider.name).toBe('opencode-cli')
    })

    it('should create opencode-cli provider with a model suffix', () => {
      const provider = createProvider('opencode-cli:openrouter/anthropic/claude-sonnet-4', mockConfig)
      expect(provider.name).toBe('opencode-cli')
    })

    it('should pass base_url through to API providers', () => {
      const configWithBaseUrl: MagpieConfig = {
        ...mockConfig,
        providers: {
          anthropic: { api_key: 'ant-key', base_url: 'https://my-proxy.example.com' },
          openai: { api_key: 'oai-key', base_url: 'https://my-openai-proxy.example.com/v1' },
        }
      }
      const anthropicProvider = createProvider('claude-sonnet-4-20250514', configWithBaseUrl)
      expect(anthropicProvider.name).toBe('anthropic')

      const openaiProvider = createProvider('gpt-4o', configWithBaseUrl)
      expect(openaiProvider.name).toBe('openai')
    })

    it('should work without base_url (backwards compatible)', () => {
      const provider = createProvider('claude-sonnet-4-20250514', mockConfig)
      expect(provider.name).toBe('anthropic')
    })

    it('should create openrouter provider (via openai client) with api key from config', () => {
      const configWithOpenrouter: MagpieConfig = {
        ...mockConfig,
        providers: { ...mockConfig.providers, openrouter: { api_key: 'or-key' } }
      }
      const provider = createProvider('openrouter/anthropic/claude-3.5-sonnet', configWithOpenrouter)
      // OpenRouter is routed through the OpenAI client, so .name === 'openai'
      expect(provider.name).toBe('openai')
    })

    it('should pick up OPENROUTER_API_KEY env var when config is absent', () => {
      vi.stubEnv('OPENROUTER_API_KEY', 'env-or-key')
      const provider = createProvider('openrouter/anthropic/claude-3.5-sonnet', mockConfig)
      expect(provider.name).toBe('openai')
    })

    it('should throw when OpenRouter has no api key configured', () => {
      vi.stubEnv('OPENROUTER_API_KEY', '')
      expect(() =>
        createProvider('openrouter/anthropic/claude-3.5-sonnet', mockConfig)
      ).toThrow(/OpenRouter API key/)
    })
  })
})