import Vue from "vue";

const DEFAULT_E_KEY = "__default";
/**
 * 方法合集
 * @type {Record<string, {eKey: string; handler: function}[]>}
 */
const events = {};

/**
 * 全局調用event的mixin
 * @type {Vue & import("vue").ComponentOptions}
 */
const globalDispatch = {
  created() {
    const attrs = this.$attrs;
    const eKey = attrs.eKey ?? attrs["e-key"];
    const filePath = this.$options.__file ?? this.$options.__filePath;
    filePath && addEvents(filePath, this, eKey);
  },
  destroyed() {
    const filePath = this.$options.__file ?? this.$options.__filePath;
    filePath && removeEvents(filePath, this);
  }
};

/**
 * 監(jiān)聽方法
 * @param {string} filePath 獲取到的路徑
 * @param {Vue} vm vue組件實例
 * @param {string=} eKey event key
 */
function addEvents(filePath, vm, eKey = DEFAULT_E_KEY) {
  const methods = vm.$options.methods;
  if (methods) {
    Object.entries(methods).forEach(([key, handler]) => {
      handler = handler.bind(vm);
      handler.vm = vm;
      const eventKey = `${filePath}:${key}`;
      const event = { eKey, handler };

      if (events[eventKey] && events[eventKey].length) {
        events[eventKey].push(event);
      } else {
        events[eventKey] = [event];
      }
    });
  }
}

/**
 * 移除方法
 * @param {string} filePath 獲取到的路徑
 * @param {Vue} vm vue組件實例
 */
function removeEvents(filePath, vm) {
  Object.keys(events).forEach(key => {
    if (key.startsWith(filePath)) {
      events[key] = events[key].filter(v => v.handler.vm !== vm);
    }
  });
}

/**
 *
 * @param {import("../../types/event-keys").EventKeys | import("../../types/shims-vue").EventParams} params
 * @param  {...any} args
 * @returns
 */
Vue.prototype.globalDispatch = function dispatch(params, ...args) {
  let eventKey,
    eKey = DEFAULT_E_KEY;
  if (typeof params === "string") {
    eventKey = params;
  } else if (typeof params === "object") {
    eventKey = params.target;
    eKey = params.eKey ?? DEFAULT_E_KEY;
  }

  const eKeyMsg = eKey !== DEFAULT_E_KEY ? `eKey:${eKey},` : "";

  if (
    !eventKey ||
    typeof eventKey !== "string" ||
    !/^[^:]*:[^:](.*){1}$/.test(eventKey)
  ) {
    throw new Error(`${eKeyMsg}eventKey:${eventKey}, 參數不正確!`);
  }

  const handlers = events[eventKey]?.filter(v => v.eKey === eKey);
  if (handlers && handlers.length) {
    const results = handlers.map(v => v.handler(...args));
    if (results.length === 1) return results[0];
    return results.map(result => ({ eKey, result }));
  }

  const method = eventKey.split(":")[1];
  throw new Error(`${eKeyMsg}method:${method},該方法未找到!`);
};

export default globalDispatch;

{
  "compilerOptions": {
    "moduleResolution": "node",
    "target": "esnext",
    "baseUrl": ".",
    "allowJs": true,
    "sourceMap": false,
    "strict": true,
    "jsx": "preserve",
    "module": "ESNext",
    "paths": {
      "@/*": ["./src/*"]
    },
    "lib": ["DOM", "ESNext"]
  },
  "vueCompilerOptions": {
    "target": 2.7
  },
  "exclude": ["node_modules", "dist"],
  "include": ["src/**/*.js", "src/**/*.vue", "types/**/*.ts", "types/**/*.d.ts"]
}

import Vue from "vue";
import { EventKeys } from "./event-keys";

export type EventParams = { target: EventKeys; eKey: string };

function globalDispatch(eventKey: EventKeys, ...args: any[]): any;
function globalDispatch(eventParams: EventParams, ...args: any[]): any;

declare module "vue/types/vue" {
  interface Vue {
    /**
     * 全局互相調用event的dispatch
     */
    globalDispatch: typeof globalDispatch;
  }
}

export type EventKeys = "src/App.vue:onClick" | "src/views/IndexView.vue:test";

const fs = require("fs");
const path = require("path");
const acorn = require("acorn");
const prettier = require("prettier");
const prettierConfig = require("../prettier.config");

/**
 * @typedef {import("webpack/lib/Compiler")} Compiler
 */

const PLUGIN_NAME = "global-dispatch";
const KEYS_PATH = path.resolve(__dirname, "../types/event-keys.d.ts");

class TransformFilePathPlugin {
  /**
   * @param {Compiler} compiler
   * @returns {void}
   */
  apply(compiler) {
    compiler.hooks.done.tap(PLUGIN_NAME, () => {
      process.env.NODE_ENV === "development" && writeEventKeys();
    });
  }
}

function writeEventKeys() {
  const vueFilePaths = getFilePath();
  writeVueKeyPaths(vueFilePaths);
}

/**
 * 緩存內容，防止重復寫入
 */
let keysContentCache = fs.readFileSync(KEYS_PATH, "utf-8");

/**
 * 寫入__filePath到type Key文件
 * @param {string[]} paths 路徑集合
 */
function writeVueKeyPaths(paths) {
  let keysContent = "export type EventKeys =";
  const keys = [];

  paths.forEach(p => {
    let content = fs.readFileSync(getSrcPath(p), "utf-8");
    const scriptMatch = content.match(/<script/g);
    if (!scriptMatch) return;

    const startIndex = content.indexOf("export default");
    if (startIndex < 0) return;

    const endIndex = content.indexOf("</script>", startIndex);
    content = content.substring(startIndex, endIndex);

    const ast = acorn.parse(content, { sourceType: "module" });
    const defaultExportAst = ast.body.find(
      v => v.type === "ExportDefaultDeclaration"
    );

    let properties;
    if (defaultExportAst.declaration.type === "CallExpression") {
      properties = defaultExportAst.declaration.arguments[0].properties;
    }
    if (
      defaultExportAst.declaration.type === "ObjectExpression" &&
      Array.isArray(defaultExportAst.declaration.properties)
    ) {
      properties = defaultExportAst.declaration.properties;
    }

    const methods = properties.find(v => v.key.name === "methods");
    if (!methods) return;

    if (methods.value.properties.length) {
      const methodNames = methods.value.properties.map(
        v => `${p}:${v.key.name}`
      );
      keys.push(...methodNames);
    }
  });

  keysContent += keys.map(v => `'${v}'`).join("|") || "string";

  keysContent = prettier.format(keysContent, {
    ...prettierConfig,
    parser: "typescript"
  });

  if (keysContentCache !== keysContent) {
    keysContentCache = keysContent;
    fs.writeFileSync(KEYS_PATH, keysContent);
  }
}

/**
 *
 * @param {string=} p 路徑
 * @returns {string[]} 路徑集合
 */
function getFilePath(p = "src") {
  const paths = fs.readdirSync(getSrcPath(p), "utf-8");
  const vueFiles = getVueFiles(paths, p);
  const dirs = getDirs(paths, p);

  if (dirs.length) {
    dirs.forEach(dir => {
      vueFiles.push(...getFilePath(dir));
    });
  }
  return vueFiles;
}

function getDirs(paths, path) {
  return paths
    .map(v => `${path}/${v}`)
    .filter(v => fs.statSync(v).isDirectory());
}

function getVueFiles(paths, path) {
  return paths.filter(v => v.endsWith(".vue")).map(v => `${path}/${v}`);
}

function getSrcPath(p) {
  return path.resolve(__dirname, "../" + p);
}

module.exports = { TransformFilePathPlugin };

module.exports = function(content) {
  if (process.env.NODE_ENV === "development") return content;

  const filePath = this.resourcePath
    .replace(/\\/g, "/")
    .replace(/(.*)?src/, "src");

  const reg = /export default.*?{/;
  content = content.replace(reg, $0 => `${$0} __filePath: "${filePath}",`);
  return content;
};

const path = require("path");
const { TransformFilePathPlugin } = require("./plugins/global-dispatch");
/**
 * @type {import('@vue/cli-service').ProjectOptions}
 */
module.exports = {
  lintOnSave: false,
  productionSourceMap: false,
  configureWebpack: {
    plugins: [new TransformFilePathPlugin()],
    module: {
      rules: [
        {
          test: /\.vue$/,
          use: [
            {
              loader: path.resolve(__dirname, "./plugins/vue-path-loader.js")
            }
          ]
        }
      ]
    }
  }
};