'use strict';

const Task = require('./task');

class MemTaskService {

    constructor() {
        this.tasks = [
            Task.withId('1', 'Task 1'),
            Task.withId('2', 'Task 2')
        ];
    }

    getTasks() {
        return Promise.resolve(this.clone(this.tasks));
    }

    getTask(id) {
        for (let task of this.tasks) {
            if (task._id === id) {
                return Promise.resolve(this.clone(task));
            }
        }
        return Promise.reject(`no task with id: ${id}`)
    }

    addTask(task) {
        task._id = this.getNewId();
        this.tasks.push(task);
        return Promise.resolve(this.clone(task));
    }

    deleteTask(id) {
        var task = null;
        for (let i=0; i < this.tasks.length; i++) {
            if (this.tasks[i]._id === id) {
                this.tasks.splice(i, 1);
                return Promise.resolve();
            }
        }
        return Promise.reject(`no task with id: ${id}`)
    }


    clone(what) {
        return JSON.parse(JSON.stringify(what));
    }

    getNewId() {
        return (Math.random() + 'A').substr(2);
    }

}

module.exports = MemTaskService;