const express = require("express")
const app = express()
const PORT = 3000
const path = require('path')

const { create } = require('express-handlebars');

const context = {
    subject: "09: użycie helperów",
    text: "Lorem ipsum dolor sit amet"
}

const hbs = create({
    defaultLayout: 'main.hbs', // Domyślny layout: views/layouts/main.hbs
    extname: '.hbs', // rozszerzenie plików szablonów
    helpers: {
        short_title: function (title) {
            return title.substring(0, 10) + "...";
        },
        capitals: function (title) {
            let words = title.split(' ')
            let output = ''
            words.forEach(word => output += word[0].toUpperCase() + word.substring(1, word.length) + ' ')
            output = output.substring(0, output.length - 1)
            return output
        },
        dashes: function (title) {
            let str = title.replaceAll(" ", "")
            let output = ''
            for (let i = 0; i < str.length; i++) {
                output += str[i] + '-'
            }
            output = output.substring(0, output.length - 1)
            return output
        }
    }
});

app.engine('.hbs', hbs.engine); // określenie silnika szablonów
app.set('view engine', '.hbs');
app.set('views', path.join(__dirname, 'views')); // ustalamy katalog views

app.get("/", function (req, res) {
    res.render('index09.hbs', context)
})

app.get("/handle04", function (req, res) {
    let data = {
        subject: context.subject,
        books: []
    };

    if (req.query.title != 'on' && req.query.author != 'on' && req.query.lang != 'on') {
        data.books.push({ value: "Musisz wybrać co najmniej jedno kryterium!" })
    } else {
        context.books.forEach(book => {
            let attributes = []
            if (req.query.title == 'on') {
                attributes.push(book.title)
            }
            if (req.query.author == 'on') {
                attributes.push(book.author)
            }
            if (req.query.lang == 'on') {
                attributes.push(book.lang)
            }
            data.books.push({ value: attributes.join(', ') })
        })
    }

    res.render('index041.hbs', data);
})

app.use(express.static("static"))

app.listen(PORT, function () {
    console.log("start serwera na porcie " + PORT)
})