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

function first2UpperCase(str) {
    return str.toLowerCase().replace(/( |^)[a-z]/g, L => L.toUpperCase());
}

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

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

                content = content
                    .replace(/\${WorkerName}/g, first2UpperCase(workerName))
                    .replace(/\${workerName}/g, workerName);

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

module.exports = {
    exec: async args => {
        if (!args.init) {
            throw new Error(`Command init not found in args`);
        }

        if (!args.name) {
            throw new Error('Command --name=... not found in args');
        }

        const name = args.name;

        const structure = {
            [`${name}_worker`]: {
                'main_thread': {
                    action: {
                        'action.worker_ability_test.ts': path.resolve(__dirname, './template/main_thread/action/action.worker_ability_test.t'),
                    },
                    [`${name}_main_thread.ts`]: path.resolve(__dirname, './template/main_thread/main_thread.t'),
                },
                utils: {
                    'action_type.ts': path.resolve(__dirname, './template/utils/action_type.t'),
                    'payload_type.ts': path.resolve(__dirname, './template/utils/payload_type.t'),
                },
                'worker_thread': {
                    action: {
                        'action.worker_ability_test.ts': path.resolve(__dirname, './template/worker_thread/action/action.worker_ability_test.t'),
                    },
                    [`${name}_worker_thread.ts`]: path.resolve(__dirname, './template/worker_thread/worker_thread.t'),
                },
            },
        };

        scanAndCreate(structure);
    },
};

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