'use strict';

const express = require('express');
const bodyParser = require('body-parser');

const Task = require('./task');
const TaskService = require('./task-service');
const dao = new TaskService();
const app = express();

app.use(bodyParser.json()); // before request handlers

app.get('/api/tasks', getTasks);
app.get('/api/tasks/:id', getTask);
app.post('/api/tasks', saveTask);
app.delete('/api/tasks/:id', deleteTask);

app.use(errorHandler); // after request handlers

app.listen(3000, () => console.log('Server is running...'));

function getTasks(request, response, next) {
    dao.getTasks()
        .then(tasks => response.json(tasks))
        .catch(next);
}

function getTask(request, response, next) {
    var id = request.params.id;
    dao.getTask(id)
        .then(task => response.json(task))
        .catch(next);
}

function saveTask(request, response, next) {
    dao.saveTask(request.body)
        .then(() => response.end())
        .catch(next);
}

function deleteTask(request, response, next) {
    var id = request.params.id;
    dao.deleteTask(id)
        .then(() => response.end())
        .catch(next);
}

function errorHandler(error, request, response, next) { // there must be 4 arguments
    response.status(500).json({ error: error.toString() });
}