src/main/kotlin/de/uapcore/lightpit/servlet/LanguageServlet.kt

/*
 * Copyright 2021 Mike Becker. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package de.uapcore.lightpit.servlet

import de.uapcore.lightpit.AbstractServlet
import de.uapcore.lightpit.Constants
import de.uapcore.lightpit.HttpRequest
import de.uapcore.lightpit.dao.DataAccessObject
import de.uapcore.lightpit.viewmodel.LanguageView
import java.util.*
import javax.servlet.annotation.WebServlet

@WebServlet(urlPatterns = ["/language/*"])
class LanguageServlet : AbstractServlet() {

    init {
        get("/", this::viewLanguages)
        post("/", this::selectLanguage)
    }

    private fun viewLanguages(http: HttpRequest, dao: DataAccessObject) {
        with(http) {
            view = LanguageView(
                availableLanguages(),
                session.getAttribute(Constants.SESSION_ATTR_LANGUAGE) as Locale,
                request.locale
            )
            styleSheets = listOf("language")
            render("language")
        }
    }

    private fun selectLanguage(http: HttpRequest, dao: DataAccessObject) {
        val lang = http.param("language")
        if (lang != null) {
            val locale = Locale.forLanguageTag(lang)
            if (!locale.language.isNullOrBlank()) {
                http.response.locale = locale
                http.session.setAttribute(Constants.SESSION_ATTR_LANGUAGE, locale)
            }
        }

        viewLanguages(http, dao)
    }

}