import { describe, expect, it, vi } from 'vitest'
import { defaultAnthropicMaximumOutputTokens } from '../../shared/contracts'
import type {
  ResolvedRuntimeSettings,
  RuntimeSettingsStore
} from '../runtime-settings-store'
import { RetryableGraphExtractionError } from './graph-extractor'
import { createModelGraphExtractor } from './model-extractor'

function store(
  overrides: Partial<ResolvedRuntimeSettings>
): RuntimeSettingsStore {
  const settings = {
    modelBaseUrl: 'http://10.0.0.25:8000/gateway',
    modelName: 'intranet-model',
    modelProtocol: 'anthropic-messages',
    modelAuthentication: 'none',
    modelProfiles: [],
    defaultModelProfileId: 'default-model',
    ...overrides
  } as ResolvedRuntimeSettings
  return {
    getResolvedSettings: vi.fn(async () => settings)
  } as unknown as RuntimeSettingsStore
}

function jsonResponse(payload: unknown, status = 200): Response {
  return new Response(JSON.stringify(payload), {
    status,
    headers: { 'content-type': 'application/json' }
  })
}

describe('createModelGraphExtractor', () => {
  it.each([
    'openai-chat-completions',
    'openai-responses'
  ] as const)('does not impose an output budget for %s', async (protocol) => {
    const fetcher = vi.fn<typeof fetch>(async () =>
      jsonResponse({
        choices: [{ message: { content: '{"entities":[]}' } }],
        output_text: '{"entities":[]}'
      })
    )
    const extract = createModelGraphExtractor(
      store({
        modelProtocol: protocol,
        modelProfiles: [{
          id: 'default-model',
          name: 'Default model',
          baseUrl: 'http://localhost:8000',
          modelName: 'intranet-model',
          protocol,
          authentication: 'none',
          maximumOutputTokens: 8192
        }]
      }),
      fetcher
    )

    await expect(extract('extract this')).resolves.toEqual({ entities: [] })
    const body = JSON.parse(String(fetcher.mock.calls[0]?.[1]?.body))
    expect(body).not.toHaveProperty('max_tokens')
    expect(body).not.toHaveProperty('max_completion_tokens')
    expect(body).not.toHaveProperty('max_output_tokens')
  })

  it.each([undefined, 48_000])(
    'uses the Anthropic connection protocol limit (%s), not an extraction budget',
    async (maximumOutputTokens) => {
      const fetcher = vi.fn<typeof fetch>(async () =>
        jsonResponse({ content: [{ type: 'text', text: '{"entities":[]}' }] })
      )
      const profile = {
        name: 'Model',
        baseUrl: 'http://localhost:8000',
        modelName: 'intranet-model',
        protocol: 'anthropic-messages' as const,
        authentication: 'none' as const
      }
      const extract = createModelGraphExtractor(
        store({
          modelProfiles: [
            { ...profile, id: 'other-model', maximumOutputTokens: 1024 },
            { ...profile, id: 'default-model', maximumOutputTokens }
          ]
        }),
        fetcher
      )

      await expect(extract('extract this')).resolves.toEqual({ entities: [] })
      const body = JSON.parse(String(fetcher.mock.calls[0]?.[1]?.body))
      expect(body.max_tokens).toBe(
        maximumOutputTokens ?? defaultAnthropicMaximumOutputTokens
      )
    }
  )

  it.each([
    ['anthropic-messages', { content: [{ type: 'text', text: '{}' }], model: 'claude-x',
      usage: { input_tokens: 11, output_tokens: 3, cache_read_input_tokens: 2, cache_creation_input_tokens: 1 } },
    { provider: 'anthropic', model: 'claude-x', input: 11, output: 3, cacheRead: 2, cacheWrite: 1 }],
    ['openai-chat-completions', { choices: [{ message: { content: '{}' } }],
      usage: { prompt_tokens: 9, completion_tokens: 4, prompt_tokens_details: { cached_tokens: 5 } } },
    { provider: 'openai', model: 'intranet-model', input: 9, output: 4, cacheRead: 5, cacheWrite: 0 }]
  ] as const)('reports %s token usage', async (protocol, payload, expected) => {
    const onUsage = vi.fn()
    const extract = createModelGraphExtractor(
      store({ modelProtocol: protocol }),
      vi.fn<typeof fetch>(async () => jsonResponse(payload)),
      undefined,
      onUsage
    )
    await expect(extract('extract this')).resolves.toEqual({})
    expect(onUsage).toHaveBeenCalledWith(expected)
  })

  it('uses an unauthenticated Anthropic endpoint with its path and query', async () => {
    const fetcher = vi.fn(async () =>
      jsonResponse({
        content: [{ type: 'text', text: '{"entities":[]}' }]
      })
    )
    const extract = createModelGraphExtractor(
      store({
        modelBaseUrl:
          'http://10.0.0.25:8000/gateway?api-version=2024-02-01'
      }),
      fetcher
    )

    await expect(
      extract('extract this', new AbortController().signal)
    ).resolves.toEqual({ entities: [] })
    expect(fetcher).toHaveBeenCalledWith(
      expect.objectContaining({
        href:
          'http://10.0.0.25:8000/gateway/v1/messages?api-version=2024-02-01'
      }),
      expect.objectContaining({
        headers: {
          'anthropic-version': '2023-06-01',
          'content-type': 'application/json'
        }
      })
    )
  })

  it('supports an unauthenticated OpenAI chat-completions endpoint', async () => {
    const fetcher = vi.fn(async () =>
      jsonResponse({
        choices: [
          {
            message: {
              content: [
                {
                  type: 'text',
                  text: '```json\n{"relations":[]}\n```'
                }
              ]
            }
          }
        ]
      })
    )
    const extract = createModelGraphExtractor(
      store({
        modelProtocol: 'openai-chat-completions',
        modelBaseUrl: 'http://192.168.1.50:11434/v1'
      }),
      fetcher
    )

    await expect(extract('extract this')).resolves.toEqual({
      relations: []
    })
    expect(fetcher).toHaveBeenCalledWith(
      expect.objectContaining({
        href:
          'http://192.168.1.50:11434/v1/chat/completions'
      }),
      expect.objectContaining({
        headers: {
          'content-type': 'application/json'
        }
      })
    )
  })

  it('supports OpenAI Responses and sends a configured bearer token', async () => {
    const fetcher = vi.fn(async () =>
      jsonResponse({
        output: [
          {
            type: 'message',
            content: [
              {
                type: 'output_text',
                text: '{"entities":[{"id":"one"}]}'
              }
            ]
          }
        ]
      })
    )
    const extract = createModelGraphExtractor(
      store({
        modelProtocol: 'openai-responses',
        modelAuthentication: 'api-key',
        apiKey: 'test-key'
      }),
      fetcher
    )

    await expect(extract('extract this')).resolves.toEqual({
      entities: [{ id: 'one' }]
    })
    expect(fetcher).toHaveBeenCalledWith(
      expect.objectContaining({
        pathname: '/gateway/responses'
      }),
      expect.objectContaining({
        headers: {
          authorization: 'Bearer test-key',
          'content-type': 'application/json'
        }
      })
    )
  })

  it('accepts top-level output text from compatible Responses providers', async () => {
    const extract = createModelGraphExtractor(
      store({ modelProtocol: 'openai-responses' }),
      vi.fn(async () =>
        jsonResponse({
          output_text: '{"entities":[],"relations":[]}'
        })
      )
    )

    await expect(extract('extract this')).resolves.toEqual({
      entities: [],
      relations: []
    })
  })

  it('requires a key only for API-key authentication', async () => {
    const extract = createModelGraphExtractor(
      store({
        modelAuthentication: 'api-key',
        apiKey: undefined
      }),
      vi.fn()
    )

    await expect(extract('extract this')).rejects.toThrow('API Key')
  })

  it('classifies empty successful responses as retryable with diagnostics', async () => {
    const extract = createModelGraphExtractor(
      store({ modelProtocol: 'openai-chat-completions' }),
      vi.fn(async () =>
        jsonResponse({
          choices: [{
            finish_reason: 'length',
            message: { content: '' }
          }]
        })
      )
    )

    await expect(extract('extract this')).rejects.toMatchObject({
      name: 'RetryableGraphExtractionError',
      message: '模型未返回图谱内容（结束原因：length）'
    })
  })

  it('classifies request timeouts as retryable', async () => {
    const fetcher = vi.fn(
      async (_input: Parameters<typeof fetch>[0], init?: RequestInit) =>
        new Promise<Response>((_resolve, reject) => {
          init?.signal?.addEventListener(
            'abort',
            () => reject(init.signal?.reason),
            { once: true }
          )
        })
    )
    const extract = createModelGraphExtractor(
      store({ modelProtocol: 'openai-chat-completions' }),
      fetcher,
      5
    )

    const result = extract('extract this')
    await expect(result).rejects.toBeInstanceOf(
      RetryableGraphExtractionError
    )
    await expect(result).rejects.toThrow(
      '模型图谱抽取响应超时'
    )
  })

  it('preserves non-retryable HTTP status with a malformed error body', async () => {
    const extract = createModelGraphExtractor(
      store({ modelProtocol: 'openai-chat-completions' }),
      vi.fn(async () =>
        new Response('<html>unauthorized</html>', { status: 401 })
      )
    )

    await expect(extract('extract this')).rejects.toMatchObject({
      name: 'Error',
      message: '模型图谱抽取失败（HTTP 401）'
    })
  })
})