const fs = require('fs');
const path = require('path');
class UnDependencClearPlugin {
  constructor(options = {}) {
    this.options = options;
    this.entry = options.entry || 'src'; // 入口
    this.include = options.include || ''; // 包含哪些文件'.vue|.js'
    this.exclude = options.exclude || ''; // 排除哪些文件夾 ['src/assets', 'src/views']
    this.isDelete = options.isDelete || false; // 是否主動刪除文件
    this.originFile = []; // node讀取的源文件目錄 處理過include及exclude 后的數據 最全的數據
    this.dependenciesFile = []; // webpack依賴數據 處理過include及exclude 后的數據 依賴數據
    this.noUseFile = []; // 可刪除的數據
    this.init(); // 初始化
  }
  apply(compiler) {
    compiler.hooks.done.tapAsync('UnDependencClearPlugin', (stats, cb) => {
      // 獲取依賴
      let curFile = [];
      stats.compilation.fileDependencies.forEach((item) => {
        curFile.push(item);
      });
      // 排除node_modules和entry
      curFile = curFile.filter((item) => {
        if (
          item.indexOf('node_modules') == -1 &&
          item.indexOf(this.resolve(this.entry)) > -1
        ) {
          return item;
        }
      });
      // 處理include
      const includeFile = this.includeHandle(curFile);
      // 處理exclude
      const excludeFile = this.excludeHandle(includeFile);
      this.dependenciesFile = excludeFile;
      // 從 originFile 及 dependenciesFile分析出未被使用的數據
      this.originFile.forEach((item) => {
        if (this.dependenciesFile.findIndex((el) => el == item) == -1) {
          this.noUseFile.push(item);
        }
      });
      // 處理資源 寫入文件
      this.writeDirPathHandle();
      cb();
    });
  }
  // 初始化
  init() {
  }
  // 處理規(guī)則
  includeHandle(list) {
    return filterFile;
  }
  // 處理規(guī)則
  excludeHandle(list) {
    return filterFile;
  }
  // 寫入文件
  writeDirPathHandle() {
  }
  // 刪除文件
  deleteFileHandle() {
  }
}
module.exports = UnDependencClearPlugin;

  // 處理規(guī)則
  includeHandle(list) {
    if (!this.include) {
      return list;
    }
    // 指定類型的文件
    const includeArr = this.include.split('|');
    const filterFile = list.filter((item) => {
      const index = includeArr.findIndex((el) => item.indexOf(el) > -1);
      if (index > -1) {
        return item;
      }
    });
    return filterFile;
  }

 // 處理規(guī)則
  excludeHandle(list) {
    if (!this.exclude) {
      return list;
    }
    // 過濾指定文件夾
    const excludeList = [];
    this.exclude.forEach((item) => {
      excludeList.push(this.resolve(item));
    });
    const filterFile = list.filter((item) => {
      const index = excludeList.findIndex((el) => item.indexOf(el) > -1);
      if (index == -1) {
        return item;
      }
    });
    return filterFile;
  }

  // 寫入文件
  writeDirPathHandle() {
    let content = `所有文件-length[${this.originFile.length}]、依賴文件-length[${this.dependenciesFile.length}]、無用文件-length[${this.noUseFile.length}]`;
    content += `\r\n###所有文件-length[${
      this.originFile.length
    }]###\r\n${this.originFile.join('\n')}\r\n`;
    content += `\r\n###依賴文件-length[${
      this.dependenciesFile.length
    }]###\r\n${this.dependenciesFile.join('\n')}\r\n`;
    content += `\r\n###無用文件-length[${
      this.noUseFile.length
    }]####\r\n${this.noUseFile.join('\n')}\r\n`;
    fs.writeFile('dependency.txt', content, (err) => {
      if (err) {
        console.error(err);
        return;
      }
      // 判斷是否執(zhí)行刪除
      if (this.isDelete) {
        this.deleteFileHandle();
      }
    });
  }

// 刪除文件
  deleteFileHandle() {
    this.noUseFile.forEach((item) => {
      fs.unlink(item, (err) => {
        if (err) throw err;
      });
    });
  }

const undependencClearPlugin = require('./undependencClearPlugin');
isEnvDevelopment &&
        new undependencClearPlugin({
          entry: '/src',
          include: '.js|.vue|.jpg',
          exclude: ['./node_modules'],
          isDelete: false,
        }),

//路由
component: () => import('@/xxx/xxx/xxx.vue')
//或者
require(['./xxx/xxx.vue'], resolve)
// 或者引入的文件
 import xxx from './xxx/xxx/xxx'