//系统模块
var fs = require('fs');
var util = require('util');
var path = require('path');
//路径
var lib = __dirname;
var root = path.join(__dirname, '../');
var taskDir = path.join(root, './tasks/');
//非系统模块
var feEvent = new(require(lib + '/feEvent'))();
var colors = require('colors');

var log = require(lib + '/feLog');

//统一对事件进行管理
var showHelp = log.help;
var showTaskList = feEvent.taskList;

//没有定义
feEvent.on('task undefined', function(task) {
    log.error('[ERROR](red): task "[' + task + '](green)" 没有定义！目前定义的task如下');
    this.taskList();
    log.log('使用 "[fe --help](red)" 获取更多帮助');
});
//参数处理

var argv = process.argv.slice(2);

var Task = module.exports = function(root, options) {
    this.list = [];
    this.options = options;

    this.root = root; //当前目录

    this.files = []; //要操作的文件
    this.isInit = false;

    this.todo = ''; //要做的task
    this.targetFile = ''; //目标文件（夹）

    this.init();
};
Task.prototype.init = function() {
    if (this.isInit) {
        return this;
    }
    this.isInit = true;
    this.parseArgs();
    return this;
}
Task.prototype.parseArgs = function() {

    var args = argv;
    args.indexOf('-o') !== -1 ? args.splice(args.indexOf('-o'), 1, '--output') : null;

    this.todo = args.splice(0, 1).toString();
    var index = args.indexOf('--output');

    if (args.length === 1 || index === -1) {
        this.files = args;
        this.targetFile = '';
    } else {
        this.files = args.slice(0, index);
        this.targetFile = args.slice(index + 1, index + 2).toString();
    }
    this.files = this.files.filter(function(v) {
        if (v.indexOf('-') === 0) {
            return false;
        }
        return true;
    });
    return this;
}

Task.prototype.run = function() {
    this.loadTask(this.todo);
    return this;
}
Task.prototype.loadTask = function(task) {
    task = task || this.todo;
    if (this.isIn(task)) {
        var taskFn = require(taskDir + task);
        if (this.options.help) {
            taskFn.help(log);
            return this;
        }
        taskFn.init(this.root, this.files, this.targetFile, this.options);
        taskFn.start(); //开始
    } else {
        feEvent.emit('task undefined', task);
    }
    return this;
}
Task.prototype.isIn = function(task) {
    if (this.list.length === 0) {
        this.getList();
    }
    return this.list.indexOf(task) !== -1;
}
Task.prototype.getList = function() {
    var files = fs.readdirSync(taskDir);
    var t = this;
    files.forEach(function(file) {
        var pathname = path.join(taskDir + file),
            stat = fs.lstatSync(pathname);

        if (!stat.isDirectory() && /\.js$/.test(file)) {
            t.list.push(file.slice(0, -3));
        }
    });
    return this;
}