const context = {
    subject: "ćwiczenie 4 - dane z tablicy, select",
    fields: [
        { name: "title" },
        { name: "author" },
        { name: "lang" }
    ],
    books: [
        { title: "Lalka", author: "B Prus", lang: "PL" },
        { title: "Hamlet", author: "W Szekspir", lang: "ENG" },
        { title: "Pan Wołodyjowski", author: "H Sienkiewicz", lang: "PL" },
        { title: "Zamek", author: "F Kafka", lang: "CZ" }
    ]
}

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

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

const hbs = create({
    defaultLayout: 'main.hbs', // Domyślny layout: views/layouts/main.hbs
    extname: '.hbs' // rozszerzenie plików szablonów
});

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('index04.hbs', context)
})

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

    if (!req.query.field) {
        data.books.push({ value: "Musisz wybrać co najmniej jedno kryterium!" })
    } else {
        switch (req.query.field) {
            case 'title':
                context.books.forEach(book => { data.books.push({ value: book.title }) })
                break
            case 'author':
                context.books.forEach(book => { data.books.push({ value: book.author }) })
                break
            case 'lang':
                context.books.forEach(book => { data.books.push({ value: book.lang }) })
                break
        }
    }

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

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

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