import { HttpsProxyAgent } from 'https-proxy-agent'
import { Config } from '../config/simpleEnv.js'
import { logger } from './logger.js'
/**
 * 统一的HTTP客户端，支持proxy和重试
 */
export class HttpClient {
  constructor() {
    this.defaultTimeout = 30000
    this.defaultRetries = 3
    this.defaultRetryDelay = 1000
    this.initializeProxy()
  }
  static getInstance() {
    if (!HttpClient.instance) {
      HttpClient.instance = new HttpClient()
    }
    return HttpClient.instance
  }
  initializeProxy() {
    if (Config.proxy.isAnyConfigured()) {
      logger.info('HTTP代理系统已初始化')
      if (Config.proxy.isConfigured()) {
        logger.info(`全局代理: ${Config.proxy.protocol()}://${Config.proxy.host()}:${Config.proxy.port()}`)
      }
      if (Config.proxy.aster.isConfigured()) {
        logger.info(
          `Aster专用代理: ${Config.proxy.aster.protocol()}://${Config.proxy.aster.host()}:${Config.proxy.aster.port()}`,
        )
      }
    } else {
      logger.info('HTTP代理未配置，使用直连')
    }
  }
  /**
   * 重新初始化代理 (当环境变量发生变化时调用)
   */
  reinitializeProxy() {
    this.proxyAgent = undefined
    this.initializeProxy()
  }
  /**
   * 检查HTTP状态码是否应该重试
   */
  shouldRetry(status) {
    return status >= 500 || status === 429 || status === 408 || status === 0
  }
  /**
   * 等待指定时间
   */
  sleep(ms) {
    return new Promise(resolve => setTimeout(resolve, ms))
  }
  /**
   * 发送HTTP请求
   */
  async request(url, options = {}) {
    const {
      method = 'GET',
      headers = {},
      body,
      timeout = this.defaultTimeout,
      signal,
      retries = this.defaultRetries,
      retryDelay = this.defaultRetryDelay,
      useProxy = true,
      exchange,
    } = options
    const maxRetries = Math.max(0, retries)
    let lastError
    // 请求配置
    const fetchOptions = {
      method,
      headers: {
        'User-Agent': 'Binance-Multi-Exchange-Client/1.0',
        ...headers,
      },
      signal,
    }
    // 添加请求体
    if (body && method !== 'GET') {
      if (typeof body === 'object') {
        fetchOptions.body = JSON.stringify(body)
        fetchOptions.headers = {
          'Content-Type': 'application/json',
          ...fetchOptions.headers,
        }
      } else {
        fetchOptions.body = body
      }
    }
    // 添加代理（仅在Node.js环境中）
    if (useProxy && typeof global !== 'undefined') {
      const proxyUrl = Config.proxy.getUrl(exchange)
      if (proxyUrl) {
        const proxyAgent = new HttpsProxyAgent(proxyUrl)
        fetchOptions.agent = proxyAgent
        if (Config.isDev()) {
          logger.debug(`使用代理发送HTTP请求`, {
            exchange: exchange || 'global',
            proxyHost: exchange === 'aster' ? Config.proxy.aster.host() : Config.proxy.host(),
            method,
            url: url.length > 100 ? url.substring(0, 100) + '...' : url,
          })
        }
      }
    }
    for (let attempt = 0; attempt <= maxRetries; attempt++) {
      try {
        // 创建超时控制
        const controller = new AbortController()
        const timeoutId = setTimeout(() => controller.abort(), timeout)
        const requestSignal = signal || controller.signal
        const startTime = Date.now()
        const response = await fetch(url, {
          ...fetchOptions,
          signal: requestSignal,
        })
        clearTimeout(timeoutId)
        const duration = Date.now() - startTime
        // 读取响应数据
        const contentType = response.headers.get('content-type') || ''
        let data
        if (contentType.includes('application/json')) {
          data = await response.json()
        } else {
          data = await response.text()
        }
        // 记录请求日志
        if (Config.isDev()) {
          logger.debug(`HTTP ${method} ${url}`, {
            status: response.status,
            duration: `${duration}ms`,
            attempt: attempt + 1,
            proxy: useProxy && this.proxyAgent ? 'enabled' : 'disabled',
          })
        }
        // 检查是否需要重试
        if (!response.ok && this.shouldRetry(response.status) && attempt < maxRetries) {
          const jitter = Math.random() * 500 // 0-500ms随机延迟
          const delay = retryDelay * Math.pow(2, attempt) + jitter
          logger.warn(`HTTP请求失败，将在${Math.round(delay)}ms后重试`, {
            url,
            status: response.status,
            attempt: attempt + 1,
            maxRetries: maxRetries + 1,
          })
          await this.sleep(delay)
          continue
        }
        return {
          status: response.status,
          statusText: response.statusText,
          ok: response.ok,
          data,
          headers: response.headers,
        }
      } catch (error) {
        lastError = error
        const isTimeout = error.name === 'AbortError'
        const isNetworkError = error.message?.includes('fetch')
        // 记录错误日志
        logger.error(`HTTP请求异常`, {
          url,
          method,
          attempt: attempt + 1,
          error: error.message,
          isTimeout,
          isNetworkError,
        })
        // 检查是否需要重试
        if ((isTimeout || isNetworkError) && attempt < maxRetries) {
          const jitter = Math.random() * 500
          const delay = retryDelay * Math.pow(2, attempt) + jitter
          logger.warn(`网络错误，将在${Math.round(delay)}ms后重试`, {
            url,
            attempt: attempt + 1,
            maxRetries: maxRetries + 1,
          })
          await this.sleep(delay)
          continue
        }
        // 不能重试，抛出错误
        throw error
      }
    }
    // 所有重试都失败了
    throw lastError || new Error(`HTTP请求失败，已重试${maxRetries}次`)
  }
  /**
   * GET 请求
   */
  async get(url, options = {}) {
    return this.request(url, { ...options, method: 'GET' })
  }
  /**
   * POST 请求
   */
  async post(url, body, options = {}) {
    return this.request(url, { ...options, method: 'POST', body })
  }
  /**
   * PUT 请求
   */
  async put(url, body, options = {}) {
    return this.request(url, { ...options, method: 'PUT', body })
  }
  /**
   * DELETE 请求
   */
  async delete(url, options = {}) {
    return this.request(url, { ...options, method: 'DELETE' })
  }
}
/**
 * 全局HTTP客户端实例
 */
export const httpClient = HttpClient.getInstance()
/**
 * 便捷方法：使用代理的fetch
 */
export async function fetchWithProxy(url, options = {}) {
  return httpClient.request(url, options)
}
/**
 * 便捷方法：GET请求with proxy
 */
export async function getWithProxy(url, options = {}) {
  const response = await httpClient.get(url, options)
  if (!response.ok) {
    throw new Error(`HTTP ${response.status}: ${response.statusText}`)
  }
  return response.data
}
/**
 * 便捷方法：POST请求with proxy
 */
export async function postWithProxy(url, body, options = {}) {
  const response = await httpClient.post(url, body, options)
  if (!response.ok) {
    throw new Error(`HTTP ${response.status}: ${response.statusText}`)
  }
  return response.data
}