const fs = require("fs");
const path = require("path");
const prettier = require("prettier");
const { exec } = require("child_process");
const { search, initDepts, depts } = require("./es6.xtype");
const _ = require("lodash");

// const XTYPE_ONLY = false;
// const THIS_REPLACE = false;

const ConflictImport = [];
const CircularDependency = [];

function objHaveFunction(obj) {
    return Object.keys(obj).some(key => {
        const value = obj[key];
        if (typeof value === "object") {
            return objHaveFunction(value);
        } else if (typeof value === "function") {
            return true;
        }

        return false;
    });
}

function parserImport(code) {
    const reg = /import {([\s\S]*?)} from "(.*?)";/g;

    const importMap = {};
    let regResult = reg.exec(code);
    while (regResult) {
        importMap[regResult[2]] = regResult[1]
            .split(",")
            .map(el => el.trim()).filter(el => el);
        regResult = reg.exec(code);
    }
    
    return importMap;
}

async function saveAndFixCode(path, code) {
    let _code = code;
    if (!code) {
        _code = fs.readFileSync(path).toString();
    }
    const prettierCode = prettier.format(_code, {
        tabWidth: 4,
        parser: 'babel',
        printWidth: 120,
    });
    fs.writeFileSync(path, prettierCode);

    new Promise(res => {
        exec(`yarn eslint --fix ${path}`, () => {
            res();
        });
    });
}

const target = [
    "isNull",
    "toPix",
    "isKey",
    "isObject",
    "map",
    "extend",
    "isFunction",
    "isEmptyArray",
    "isArray",
    "Controller",
    "createWidget",
    "Events",
    "emptyFn",
    "nextTick",
    "bind",
    "i18nText",
    "isNotNull",
    "isString",
    "isNumber",
    "isEmpty",
    "isEmptyString",
    "any",
    "deepContains",
    "isNotEmptyString",
    "each",
    "contains",
    "remove",
    "createItems",
    "makeArrayByArray",
    "VerticalAlign",
    "pushDistinct",
    "endWith",
    "transformItems",
    "print",
    "Tree",
    "Func",
    "Selection",
];

// 加载模块
const loader = {
    // G: { "@/core": { shortcut: true } },
    load(srcName, module) {
        const G = loader.G;
        if (target.indexOf(module) >= 0) {
            G["@/core"][module] = true;

            return true;
        }
        if (module.startsWith('"bi.')) {
            const key = search(srcName, module);
            if (key) {
                if (!G[key]) {
                    G[key] = {};
                }
                const clzName = depts[module].clzName;
                G[key][clzName] = true;
            }

            return !!key;
        } else {
            const key = search(srcName, module);
            if (key) {
                if (!G[key]) {
                    G[key] = {};
                }
                G[key][module] = true;
            }

            return !!key;
        }
    },
};

async function handleFile(srcName) {
    await saveAndFixCode(srcName);
    // 全局状态回归
    let G = loader.G = { };
    
    const sourceCode = fs.readFileSync(srcName).toString();

    const result = /BI\.(.*?)\s=\sBI\.inherit\(/.exec(sourceCode);
    if (!result) {
        // console.log(`已经es6过，替换 xtype =>  ${srcName}`);
        if (!/export class/.test(sourceCode)) {
            console.log("忽略文件", srcName);

            return;
        }

        // 处理 xtype
        const noXtypeCode = sourceCode.replace(/type:\s?"bi\.(.*?)"/g, v => {
            const matchedSentence = v.replace(/type:\s?/, "");
            const loadSuccess = loader.load(srcName, matchedSentence);
            if (loadSuccess) {
                const clzName = depts[matchedSentence].clzName;

                return `type: ${clzName}.xtype`;
            } else {
                console.log(`xtype 替换失败  ${matchedSentence}  `);

                return v;
            }
        });
        // 识别 import
        const importMap = parserImport(noXtypeCode);
       
        // 合并原来的 import 到 G
        _.forEach(importMap, (depts, module) => {
            depts.forEach(dept => {
                if (!G[module]) {
                    G[module] = {};
                }

                G[module][dept] = true;
            });
        });

        // 合并 core
        const crossPackages = fs.readdirSync("src");
        _.forEach(G, (depts, module) => {
            crossPackages.forEach(crosspackage => {
                if (module.indexOf(crosspackage) >= 0) {
                    if (!G[`@/${crosspackage}`]) {
                        G[`@/${crosspackage}`] = {};
                    }
                    Object.assign(G[`@/${crosspackage}`], depts);
                }
            });
        });
        
        const tmpG = {};
        _.forEach(G, (depts, module) => {
            const flag = _.some(crossPackages, crosspackage => module.indexOf(crosspackage) >= 0 && !module.startsWith("@"));
            if (!flag) {
                tmpG[module] = depts;
            }
        });
        

        // 较验手工 import 错误
        const map = {};
        let conflict = false;
        let circle = false;
        _.forEach(tmpG, (imports, fromStr) => {
            if (srcName.indexOf("base") >= 0) {
                if (fromStr === "@/case" || fromStr === "@/base") {
                    circle = true;
                }
            }

            _.forEach(imports, (bools, _import) => {
                if (map[_import] && map[_import] !== fromStr) {
                    conflict = true;
                }
                
                map[_import] = fromStr;
            });
        });

        conflict && ConflictImport.push(srcName);
        circle && CircularDependency.push(srcName);

        G = tmpG;
  
        const noImportCode = noXtypeCode.replace(/import {([\s\S]*?)} from "(.*?)";/g, "");
        
        let I = "";
        Object.keys(G).forEach(key => {
            let moduleKey = key;
            if (moduleKey === path.basename(srcName).replace(/.js$/g, "")) {
                return;
            }
            let i = "";
            Object.keys(G[moduleKey]).forEach(key => {
                i += `${key}, `;
            });
    
            // 必须以 . 开头
            const moduleInValid = /^[^@.]/.test(moduleKey);
            if (moduleInValid) {
                moduleKey = `./${moduleKey}`;
            }
            
            
            I += `import {${i}} from '${moduleKey}'\n`;
        });
        const code = `${I}\n${noImportCode}`;

        await saveAndFixCode(srcName, code);

        return;
    }

    G["@/core"] = { shortcut: true };


    const clzName = result[1];

    if (!clzName) {
        console.log(`${srcName} 不需要 es6 化`);
        
        return;
    }

    const superName = /inherit\(BI\.(.*?),/.exec(sourceCode)[1];
    
    // const xtype = /BI.shortcut\(\"(.*?)\"/.exec(sourceCode)[1];

    const collection = {
        "static": {},
        attr: {},
    };

    // eslint-disable-next-line no-unused-vars
    const BI = {
        [clzName]: clzName,
        inherit(_, options) {
            collection.methods = Object.keys(options)
                .filter(key => typeof options[key] === "function")
                .map(key => options[key]);
            Object.keys(options)
                .filter(key => typeof options[key] !== "function")
                .forEach(key => {
                    collection.attr[key] = options[key];
                });

            return collection.static;
        },
        extend(targetClz, o) {
            Object.assign(collection.static, o);
        },
        shortcut(xtype) {
            collection.xtype = xtype;
        },
    };

    // eslint-disable-next-line no-eval
    eval(sourceCode);

    let M = "";
    let E = "";
    let I = "";
    let A = "";

    loader.load(srcName, superName);

    Object.keys(collection.attr).forEach(key => {
        const value = collection.attr[key];
        if (typeof value === "function" || typeof value === "number") {
            A += `\t${key} = ${value}\n`;
        } else if (typeof value === "string") {
            A += `\t${key} = "${value}"\n`;
        } else if (typeof value === "object") {
            if (objHaveFunction(value)) {
                throw new Error("G");
            } else {
                A += `\t${key} = ${JSON.stringify(value)}\n`;
            }
        }
    });

    // 静态方法
    Object.keys(collection.static).forEach(key => {
        // console.log(key, collection.static[key], typeof collection.static[key])
        const value = collection.static[key];
        if (typeof value === "function" || typeof value === "number") {
            E += `\tstatic ${key} = ${value}\n`;
        } else if (typeof value === "string") {
            E += `\tstatic ${key} = "${value}"\n`;
        } else if (typeof value === "object") {
            if (objHaveFunction(value)) {
                throw new Error("G");
            } else {
                E += `\tstatic ${key} = ${JSON.stringify(value)}\n`;
            }
        }
    });

    // 对函数进行替换
    collection.methods.forEach(el => {
        let f = `${el.toString().replace(/^function/, el.name)}\n`;

        // 换 BI.Button.superclass，就说能不能跑吧
        for (let i = 0; i < 100; i++) {
            f = f.replace(`BI.${clzName}.superclass`, "super");
        }
        // 换 super._defaultConfig
        f = f.replace(
            /super\._defaultConfig\.apply\(this,\sarguments\)/g,
            "super._defaultConfig(...arguments)",
        );
        // 换 super.xxx.apply
        f = f.replace(/super\.(.*?)\.apply\(this,\sarguments\)/g, a => {
            const f = /super\.(.*?)\.apply\(this,\sarguments\)/.exec(a);

            return `super.${f[1]}(...arguments)`;
        });

        // 尝试换掉所有的 BI.xxx. BI.xxx(  BI.xxx[空白]
        f = f.replace(/BI\.(.*?)(\.|\(|\s|,)/g, matchedSentence => {
            const match = /BI\.(.*?)(\.|\(|\s|,)/.exec(matchedSentence);
            const target = match[1];
            const end = match[2];
            // 尝试加载 target
            const loadSuccess = loader.load(srcName, target);
            if (loadSuccess) {
                return target + end;
            } else {
                console.log(`BI 变量替换失败 BI.${target}`);

                return matchedSentence;
            }
        });

        // 尝试对 xtype 进行替换
        f = f.replace(/"bi\.(.*?)"/g, matchedSentence => {
            const loadSuccess = loader.load(srcName, matchedSentence);
            if (loadSuccess) {
                const clzName = depts[matchedSentence].clzName;

                return `${clzName}.xtype`;
            } else {
                // console.log(`(没事) xtype 替换失败  ${matchedSentence}  `);

                return matchedSentence;
            }
        });

        M += `${f}\n`;
    });

    Object.keys(G).forEach(key => {
        let moduleKey = key;
        if (moduleKey === path.basename(srcName).replace(/.js$/g, "")) {
            return;
        }
        let i = "";
        Object.keys(G[moduleKey]).forEach(key => {
            i += `${key}, `;
        });

        // 必须以 . 开头
        const moduleInValid = /^[^@.]/.test(moduleKey);
        if (moduleInValid) {
            moduleKey = `./${moduleKey}`;
        }

        I += `import {${i}} from '${moduleKey}'\n`;
    });

    const outputCode = `
${I}

@shortcut()
export class ${clzName} extends ${superName} {
\tstatic xtype = "${collection.xtype}"

${A}

${E}

${M}
}
`;
    await saveAndFixCode(srcName, outputCode);

    return clzName;
}

async function traverse(srcName) {
    if (srcName.indexOf("__test__") >= 0) return;

    if (srcName.endsWith(".js")) {
        try {
            return await handleFile(srcName);
        } catch (error) {
            console.log(`文件处理失败 ${srcName} \n`);
            console.error(error);

            return;
        }
    } else {
        const stat = fs.statSync(srcName);
        const flag = stat.isDirectory();
        if (flag) {
            const files = fs.readdirSync(srcName);
            // let indexContent = "";
            for (let i = 0; i < files.length; i++) {
                const file = files[i];
                await traverse(path.resolve(srcName, file));
                // const clzName = await traverse(path.resolve(srcName, file));
                // const moduleName = path.basename(srcName).replace(/.js$/, "");
                // if (clzName) {
                //     indexContent += `export { ${clzName} } from '${moduleName}'\n`;
                // }
            }
        }
    }
}

const srcName = process.argv[2];

initDepts().then(async () => {
    const content = fs.readFileSync("src/core/2.base.js").toString();

    let result = content.match(/export function (.*?)\(/g);
    target.push(
        ...result.map(el =>
            el.replace("export function ", "").replace("(", ""),
        ),
    );
    result = content.match(/export const (.*?) =/g);
    target.push(
        ...result.map(el => el.replace("export const ", "").replace(" =", "")),
    );

    await traverse(srcName);

    // 对数据处理
    ConflictImport.forEach(el => {
        console.log(`导入冲突 ${el}`);
    });
    CircularDependency.forEach(el => {
        console.log(`出现循环依赖 ${el}`);
    });
});