'use strict';

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

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

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

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

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

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

function getTasks(request, response) {
    response.set('Content-Type', 'application/json');
    dao.getTasks()
        .then(tasks => {
            response.json(tasks);
        });
}

function getTask(request, response, next) {
    var id = request.params.id;
    dao.getTask(id)
        .then(task => {
            response.set('Content-Type', 'application/json');
            response.json(task);
        }).catch(next)
}

function addTask(request, response) {
    var task = request.body
    dao.addTask(task)
        .then(task => {
            response.set('Content-Type', 'application/json');
            response.json(task);
        }).catch(next)
}

function deleteTask(request, response) {
    var id = request.params.id;

    dao.deleteTask(id)
        .then(task => {
            response.set('Content-Type', 'application/json');
            response.json(task);
        }).catch(next)
}

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