const { writeFileSync, existsSync } = require('fs')
const { resolve } = require('path')

/**
 * 文件生成模块
 * 负责生成最终的映射文件
 */
class FileGenerator {
  constructor() {
    this.outputPath = resolve(__dirname, '../../src/renderer/modules/route-sync/direct-route-mappings.js')
  }

  /**
   * 生成映射文件
   * @param {Array} routes - 路由数组
   * @param {Array} apiMappings - API映射数组
   */
  generateMappingFile(routes, apiMappings) {
    const content = this.generateFileContent(routes, apiMappings)
    
    // 如果文件已存在，先清空内容
    if (existsSync(this.outputPath)) {
      writeFileSync(this.outputPath, '', 'utf-8')
    }
    
    // 写入新内容
    writeFileSync(this.outputPath, content, 'utf-8')
  }

  /**
   * 生成基础映射文件 - 优化版本：仅创建基础结构
   */
  generateBasicMappingFile() {
    const content = `// 路由映射数据 - 构建时生成
export default {
  // 路由配置
  routes: [],
  
  // API映射配置
  apiMappings: []
}`
    
    // 如果文件已存在，先清空内容
    if (existsSync(this.outputPath)) {
      writeFileSync(this.outputPath, '', 'utf-8')
    }
    
    // 写入新内容
    writeFileSync(this.outputPath, content, 'utf-8')
  }

  /**
   * 生成路由映射文件 - 第二步：包含路由信息
   * @param {Array} routes - 路由数组
   */
  generateRouteMappingFile(routes) {
    const content = `// 路由映射数据 - 构建时生成
export default {
  // 路由配置
  routes: ${JSON.stringify(routes, null, 2)},
  
  // API映射配置
  apiMappings: []
}`
    
    // 如果文件已存在，先清空内容
    if (existsSync(this.outputPath)) {
      writeFileSync(this.outputPath, '', 'utf-8')
    }
    
    // 写入新内容
    writeFileSync(this.outputPath, content, 'utf-8')
  }

  /**
   * 生成路由和API映射文件 - 第三步第一小步：包含API信息
   * @param {Array} routes - 路由数组
   * @param {Array} apiMappings - API映射数组
   */
  generateRouteApiMappingFile(routes, apiMappings) {
    const content = `// 路由映射数据 - 构建时生成
export default {
  // 路由配置
  routes: ${JSON.stringify(routes, null, 2)},
  
  // API映射配置
  apiMappings: ${JSON.stringify(apiMappings, null, 2)}
}`
    
    // 如果文件已存在，先清空内容
    if (existsSync(this.outputPath)) {
      writeFileSync(this.outputPath, '', 'utf-8')
    }
    
    // 写入新内容
    writeFileSync(this.outputPath, content, 'utf-8')
  }

  /**
   * 生成文件内容
   * @param {Array} routes - 路由数组
   * @param {Array} apiMappings - API映射数组
   * @returns {string} 文件内容
   */
  generateFileContent(routes, apiMappings) {
    // 瘦身处理：只保留运行时必需的信息
    const slimRoutes = this.slimRoutes(routes)
    const slimApiMappings = this.slimApiMappings(apiMappings)
    
    const header = `// 路由映射数据 - 构建时生成
export default {
  // 路由配置
  routes: ${JSON.stringify(slimRoutes, null, 2)},
  
  // API映射配置
  apiMappings: ${JSON.stringify(slimApiMappings, null, 2)}
}`
    
    return header
  }

  /**
   * 瘦身路由信息
   * @param {Array} routes - 原始路由数组
   * @returns {Array} 瘦身后的路由数组
   */
  slimRoutes(routes) {
    return routes.map(route => ({
      path: route.path,
      name: route.name,
      component: route.component,
      description: route.description
    }))
  }

  /**
   * 瘦身API映射信息
   * @param {Array} apiMappings - 原始API映射数组
   * @returns {Array} 瘦身后的API映射数组
   */
  slimApiMappings(apiMappings) {
    return apiMappings.map(api => ({
      apiMethodName: api.apiMethodName,
      method: api.method,
      path: api.path,
      serviceName: api.serviceName,
      module: api.module,
      triggerSources: api.triggerSources.map(trigger => ({
        component: trigger.component,
        triggerName: trigger.triggerName,
        triggerType: trigger.triggerType
      }))
    }))
  }

  /**
   * 优化API映射
   * @param {Array} apiMappings - API映射数组
   * @returns {Array} 优化后的API映射数组
   */
  optimizeApiMappings(apiMappings) {
    const optimizedApiMappings = []
    let totalRemoved = 0
    
    apiMappings.forEach(apiMapping => {
      // 删除无触发器的API映射
      if (!apiMapping.triggerSources || apiMapping.triggerSources.length === 0) {
        totalRemoved++
        return
      }
      
      // 去重触发器源
      const uniqueTriggerSources = this.deduplicateTriggerSources(apiMapping.triggerSources)
      
      optimizedApiMappings.push({
        ...apiMapping,
        triggerSources: uniqueTriggerSources
      })
    })
    
    return optimizedApiMappings
  }

  /**
   * 去重触发器源
   * @param {Array} triggerSources - 触发器源数组
   * @returns {Array} 去重后的触发器源数组
   */
  deduplicateTriggerSources(triggerSources) {
    const seen = new Set()
    return triggerSources.filter(trigger => {
      const key = `${trigger.component}-${trigger.triggerName}-${trigger.triggerType}`
      if (seen.has(key)) {
        return false
      }
      seen.add(key)
      return true
    })
  }
}

module.exports = FileGenerator