import { OpenRouterHandler } from '../openrouter'
import { ApiHandlerOptions, ModelInfo } from '../../../shared/api'
import OpenAI from 'openai'
import axios from 'axios'
import { Anthropic } from '@anthropic-ai/sdk'

// Mock dependencies
jest.mock('openai')
jest.mock('axios')
jest.mock('delay', () => jest.fn(() => Promise.resolve()))

describe('OpenRouterHandler', () => {
    const mockOptions: ApiHandlerOptions = {
        openRouterApiKey: 'test-key',
        openRouterModelId: 'test-model',
        openRouterModelInfo: {
            name: 'Test Model',
            description: 'Test Description',
            maxTokens: 1000,
            contextWindow: 2000,
            supportsPromptCache: true,
            inputPrice: 0.01,
            outputPrice: 0.02
        } as ModelInfo
    }

    beforeEach(() => {
        jest.clearAllMocks()
    })

    test('constructor initializes with correct options', () => {
        const handler = new OpenRouterHandler(mockOptions)
        expect(handler).toBeInstanceOf(OpenRouterHandler)
        expect(OpenAI).toHaveBeenCalledWith({
            baseURL: 'https://openrouter.ai/api/v1',
            apiKey: mockOptions.openRouterApiKey,
            defaultHeaders: {
                'HTTP-Referer': 'https://github.com/RooVetGit/Roo-Cline',
                'X-Title': 'Roo-Cline',
            },
        })
    })

    test('getModel returns correct model info when options are provided', () => {
        const handler = new OpenRouterHandler(mockOptions)
        const result = handler.getModel()
        
        expect(result).toEqual({
            id: mockOptions.openRouterModelId,
            info: mockOptions.openRouterModelInfo
        })
    })

    test('getModel returns default model info when options are not provided', () => {
        const handler = new OpenRouterHandler({})
        const result = handler.getModel()
        
        expect(result.id).toBe('anthropic/claude-3.5-sonnet:beta')
        expect(result.info.supportsPromptCache).toBe(true)
    })

    test('createMessage generates correct stream chunks', async () => {
        const handler = new OpenRouterHandler(mockOptions)
        const mockStream = {
            async *[Symbol.asyncIterator]() {
                yield {
                    id: 'test-id',
                    choices: [{
                        delta: {
                            content: 'test response'
                        }
                    }]
                }
            }
        }

        // Mock OpenAI chat.completions.create
        const mockCreate = jest.fn().mockResolvedValue(mockStream)
        ;(OpenAI as jest.MockedClass<typeof OpenAI>).prototype.chat = {
            completions: { create: mockCreate }
        } as any

        // Mock axios.get for generation details
        ;(axios.get as jest.Mock).mockResolvedValue({
            data: {
                data: {
                    native_tokens_prompt: 10,
                    native_tokens_completion: 20,
                    total_cost: 0.001
                }
            }
        })

        const systemPrompt = 'test system prompt'
        const messages: Anthropic.Messages.MessageParam[] = [{ role: 'user' as const, content: 'test message' }]

        const generator = handler.createMessage(systemPrompt, messages)
        const chunks = []
        
        for await (const chunk of generator) {
            chunks.push(chunk)
        }

        // Verify stream chunks
        expect(chunks).toHaveLength(2) // One text chunk and one usage chunk
        expect(chunks[0]).toEqual({
            type: 'text',
            text: 'test response'
        })
        expect(chunks[1]).toEqual({
            type: 'usage',
            inputTokens: 10,
            outputTokens: 20,
            totalCost: 0.001,
            fullResponseText: 'test response'
        })

        // Verify OpenAI client was called with correct parameters
        expect(mockCreate).toHaveBeenCalledWith(expect.objectContaining({
            model: mockOptions.openRouterModelId,
            temperature: 0,
            messages: expect.arrayContaining([
                { role: 'system', content: systemPrompt },
                { role: 'user', content: 'test message' }
            ]),
            stream: true
        }))
    })

    test('createMessage with middle-out transform enabled', async () => {
        const handler = new OpenRouterHandler({
            ...mockOptions,
            openRouterUseMiddleOutTransform: true
        })
        const mockStream = {
            async *[Symbol.asyncIterator]() {
                yield {
                    id: 'test-id',
                    choices: [{
                        delta: {
                            content: 'test response'
                        }
                    }]
                }
            }
        }

        const mockCreate = jest.fn().mockResolvedValue(mockStream)
        ;(OpenAI as jest.MockedClass<typeof OpenAI>).prototype.chat = {
            completions: { create: mockCreate }
        } as any
        ;(axios.get as jest.Mock).mockResolvedValue({ data: { data: {} } })

        await handler.createMessage('test', []).next()

        expect(mockCreate).toHaveBeenCalledWith(expect.objectContaining({
            transforms: ['middle-out']
        }))
    })

    test('createMessage with Claude model adds cache control', async () => {
        const handler = new OpenRouterHandler({
            ...mockOptions,
            openRouterModelId: 'anthropic/claude-3.5-sonnet'
        })
        const mockStream = {
            async *[Symbol.asyncIterator]() {
                yield {
                    id: 'test-id',
                    choices: [{
                        delta: {
                            content: 'test response'
                        }
                    }]
                }
            }
        }

        const mockCreate = jest.fn().mockResolvedValue(mockStream)
        ;(OpenAI as jest.MockedClass<typeof OpenAI>).prototype.chat = {
            completions: { create: mockCreate }
        } as any
        ;(axios.get as jest.Mock).mockResolvedValue({ data: { data: {} } })

        const messages: Anthropic.Messages.MessageParam[] = [
            { role: 'user', content: 'message 1' },
            { role: 'assistant', content: 'response 1' },
            { role: 'user', content: 'message 2' }
        ]

        await handler.createMessage('test system', messages).next()

        expect(mockCreate).toHaveBeenCalledWith(expect.objectContaining({
            messages: expect.arrayContaining([
                expect.objectContaining({
                    role: 'system',
                    content: expect.arrayContaining([
                        expect.objectContaining({
                            cache_control: { type: 'ephemeral' }
                        })
                    ])
                })
            ])
        }))
    })

    test('createMessage handles API errors', async () => {
        const handler = new OpenRouterHandler(mockOptions)
        const mockStream = {
            async *[Symbol.asyncIterator]() {
                yield {
                    error: {
                        message: 'API Error',
                        code: 500
                    }
                }
            }
        }

        const mockCreate = jest.fn().mockResolvedValue(mockStream)
        ;(OpenAI as jest.MockedClass<typeof OpenAI>).prototype.chat = {
            completions: { create: mockCreate }
        } as any

        const generator = handler.createMessage('test', [])
        await expect(generator.next()).rejects.toThrow('OpenRouter API Error 500: API Error')
    })

    test('completePrompt returns correct response', async () => {
        const handler = new OpenRouterHandler(mockOptions)
        const mockResponse = {
            choices: [{
                message: {
                    content: 'test completion'
                }
            }]
        }

        const mockCreate = jest.fn().mockResolvedValue(mockResponse)
        ;(OpenAI as jest.MockedClass<typeof OpenAI>).prototype.chat = {
            completions: { create: mockCreate }
        } as any

        const result = await handler.completePrompt('test prompt')

        expect(result).toBe('test completion')
        expect(mockCreate).toHaveBeenCalledWith({
            model: mockOptions.openRouterModelId,
            messages: [{ role: 'user', content: 'test prompt' }],
            temperature: 0,
            stream: false
        })
    })

    test('completePrompt handles API errors', async () => {
        const handler = new OpenRouterHandler(mockOptions)
        const mockError = {
            error: {
                message: 'API Error',
                code: 500
            }
        }

        const mockCreate = jest.fn().mockResolvedValue(mockError)
        ;(OpenAI as jest.MockedClass<typeof OpenAI>).prototype.chat = {
            completions: { create: mockCreate }
        } as any

        await expect(handler.completePrompt('test prompt'))
            .rejects.toThrow('OpenRouter API Error 500: API Error')
    })

    test('completePrompt handles unexpected errors', async () => {
        const handler = new OpenRouterHandler(mockOptions)
        const mockCreate = jest.fn().mockRejectedValue(new Error('Unexpected error'))
        ;(OpenAI as jest.MockedClass<typeof OpenAI>).prototype.chat = {
            completions: { create: mockCreate }
        } as any

        await expect(handler.completePrompt('test prompt'))
            .rejects.toThrow('OpenRouter completion error: Unexpected error')
    })
})