const path = require('path');
const config = require('../config');
const logger = require('./logger');
const blinkstick = require('./blinkstick');
const parser = require('./parser.js');

const express = require('express');
const favicon = require('serve-favicon');
const bodyparser = require('body-parser');

const app = express();
app.use(favicon(path.join(path.dirname(__dirname), 'public', 'favicon.ico')));
app.use(bodyparser.json());
app.use(bodyparser.urlencoded({extended: true}));

const MODE_SET = require('./blinkstick.js').MODE_SET;
const MODE_MORPH = require('./blinkstick.js').MODE_MORPH;
const MODE_BLINK = require('./blinkstick.js').MODE_BLINK;
const MODE_PULSE = require('./blinkstick.js').MODE_PULSE;
const MODE_POWEROFF = require('./blinkstick.js').MODE_POWEROFF;

const html = require('./index.js').get();

// run the express http server and handle gets/posts
async function start() {
    return await new Promise(function (resolve, reject) {
        app.listen(config.server.port, config.server.listen)
            .on('listening', function () {
                resolve('server listening on ' + config.server.listen + ':' + config.server.port + '...')
            })
            .on('error', function (err) {
                reject('error starting server (' + err + ')');
            });
    });
}

function handleRequests() {
    // GET html page
    app.get('*', (request, response) => {
        logger.http(request);
        response.send(html);
        response.end();
    });
    // POST '/set'
    app.post('/' + MODE_SET, (request, response) => {
        logger.http(request);
        handleSimpleAnimation(parser.parseRequest(request.body, MODE_SET), response);
    });
    // POST '/morph'
    app.post('/' + MODE_MORPH, (request, response) => {
        logger.http(request);
        handleSimpleAnimation(parser.parseRequest(request.body, MODE_MORPH), response);
    });
    // POST '/blink'
    app.post('/' + MODE_BLINK, (request, response) => {
        logger.http(request);
        handleComplexAnimation(parser.parseRequest(request.body, MODE_BLINK), response);
    });
    // POST '/pulse'
    app.post('/' + MODE_PULSE, (request, response) => {
        logger.http(request);
        handleComplexAnimation(parser.parseRequest(request.body, MODE_PULSE), response);
    });
    // POST '/poweroff'
    app.post('/' + MODE_POWEROFF, (request, response) => {
        logger.http(request);
        handlePowerOff(parser.parseRequest(request.body, MODE_POWEROFF), response);
    });
}

async function handleSimpleAnimation(config, response) {
    try {
        response.end(JSON.stringify(await blinkstick.simple(config)));
    } catch (err) {
        logger.error(err);
        response.status(500);
        response.end(JSON.stringify({status: 'error', error: err.message}));
    }
}

async function handleComplexAnimation(config, response) {
    if (blinkstick.isInfiniteAnimation(config)) {
        response.end(JSON.stringify({status: 'ok', time: 'infinite'}));
        response = undefined;
    }
    try {
        const result = await blinkstick.complex(config);
        if (response === undefined) {
            return;
        }
        response.end(JSON.stringify(result));
    } catch (err) {
        if (response === undefined) {
            return;
        }
        logger.error(err);
        response.status(500);
        response.end(JSON.stringify({status: 'error', error: err.message}));
    }
}

async function handlePowerOff(config, response) {
    try {
        response.end(JSON.stringify(await blinkstick.powerOff(config)));
    } catch (err) {
        response.status(500);
        response.end(JSON.stringify({status: 'error', error: err.message}));
    }
}

// exports
module.exports = {
    start,
    handleRequests
};