const parser = require("@babel/parser");
const t = require("@babel/types");
const generator = require("@babel/generator");
const fs = require("fs");

function wtofile(path, flags, code) {
    var fd = fs.openSync(path,flags);
    fs.writeSync(fd, code);
    fs.closeSync(fd);
}

var loader_path = 'runtime.62249a5.js';
var jscode = fs.readFileSync(loader_path, {
    encoding: "utf-8"
});

// 转换为AST语法树
let loader_ast = parser.parse(jscode);

// 获取加载器代码
let loader_body = loader_ast.program.body[0].expression.argument.callee.body.body;
for (let i = 0; i < loader_body.length; i++){
    if (loader_body[i].type === 'VariableDeclaration'){
        loader_ast.program.body[0].expression.argument.callee.body.body.splice(i+3, (loader_body.length- i-3));
        loader_ast.program.body[0].expression.argument.callee.body.body.splice(0, i);
        loader_ast.program.body[0].expression.argument.callee.body.body.push(t.assignmentExpression("=", t.identifier("export_function"), t.identifier(loader_ast.program.body[0].expression.argument.callee.body.body[1].id.name)));
        break
    }
}

// 修改加载器参数类型
let loader_arguments = loader_ast.program.body[0].expression.argument.arguments[0] = t.objectExpression([]);

// 加载函数体
var modular_path = ['app.597640f.js', 'search.cfd9038.js', 'commons.1e71338.js'];

modular_path.forEach(function (item, index) {
    var jscode = fs.readFileSync(item, {
        encoding: "utf-8"
    });

    let modular_ast = parser.parse(jscode);
    modular_ast.program.body[0].expression.arguments[0].elements.forEach(function (item2, index2) {
        if (item2.type === 'ArrayExpression'){
            item2.elements.forEach(function (item3, index3) {
                if (item3 && item3.type === 'FunctionExpression'){
                    loader_arguments.properties.push(t.objectProperty(
                        t.numericLiteral(index3),
                        item3,
                        false,
                        false
                    ));
                }
            });
        }else {
            item2.properties.forEach(function (item3, index3) {
                loader_arguments.properties.push(item3)
            })
        }
    });
});

// 申请全局导出函数
loader_ast.program.body.splice(0, 0, t.variableDeclaration("var",[t.variableDeclarator(t.identifier("export_function"))]));

let code = generator.default(loader_ast, {
    compact: true,  // 压缩格式
    comments: false,  // 注释
    jsescOption: {
        minimal: false // 转义
    }
}).code;
wtofile('webpack_out.js', 'w', code);