const fs = require('fs');
const path = require('path');

function getArgs (startIndex = 1) {
    const args = {};
    process.argv
        .slice(startIndex, process.argv.length)
        .forEach(arg => {
        // long arg
        if (arg.slice(0, 2) === '--') {
            const longArg = arg.split('=');
            const longArgFlag = longArg[0].slice(2, longArg[0].length);
            const longArgValue = longArg.length > 1 ? longArg[1] : true;
            args[longArgFlag] = longArgValue;
            // flags
        } else if (arg[0] === '-') {
            const flags = arg.slice(1, arg.length).split('');
            flags.forEach(flag => {
            args[flag] = true;
            });
        }
    });

    return args;
}

function scanAndCreate(structure, root = process.cwd()) {
    Object.keys(structure)
        .forEach(name => {
            if (typeof structure[name] === 'object') {
                fs.mkdirSync(path.resolve(root, name));

                scanAndCreate(structure[name], path.resolve(root, `./${name}`));
            } else if (structure[name] === '') {
                fs.appendFileSync(path.resolve(root, name), '');
            } else if (typeof structure[name] === 'string') {
                const content = fs.readFileSync(structure[name]).toString();

                fs.appendFileSync(path.resolve(root, name), content);
           }
        });
}

module.exports = {
    exec: async () => {
        const args = getArgs(process.argv);

        if (!args['-init']) {
            throw new Error('command not found');
        }

        if (!args['--name']) {
            throw new Error('fileName not found');
        }

        const name = args['--name'];

        const structure = {
            [`${name}_worker`]: {
                'main_thread': {
                    action: {},
                    [`${name}_main_thread.ts`]: path.resolve(__dirname, './template/main_thread_template.ts'),
                },
                utils: {
                    'action_type.ts': '',
                },
                'worker_thread': {
                    action: {},
                    [`${name}_worker_thread.ts`]: path.resolve(__dirname, './template/worker_thread_template.ts'),
                },
            },
        };

        scanAndCreate(structure);
    },
};

// 结构
// -xxx_worker
// -|--main_thread
// -|--|--action
// -|--|--xxx_main_thread.ts
// -|--utils
// -|--|--action_type.ts
// -|--worker_thread
// -|--|--action
// -|--|--worker_main_thread.ts