src/main/kotlin/de/uapcore/lightpit/servlet/UsersServlet.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.*
import de.uapcore.lightpit.dao.DataAccessObject
import de.uapcore.lightpit.entities.User
import de.uapcore.lightpit.viewmodel.UserEditView
import de.uapcore.lightpit.viewmodel.UsersView
import javax.servlet.annotation.WebServlet

@WebServlet(urlPatterns = ["/users/*"])
class UsersServlet : AbstractServlet(), LoggingTrait {

    init {
        get("/", this::index)
        get("/-/create", this::create)
        get("/%userid/edit", this::edit)
        post("/-/commit", this::commit)
    }

    private val list = "users"
    private val form = "user-form"

    private fun index(http: HttpRequest, dao: DataAccessObject) {
        with(http) {
            view = UsersView(dao.listUsers())
            render(list)
        }
    }

    private fun create(http: HttpRequest, dao: DataAccessObject) {
        with(http) {
            view = UserEditView(User(-1))
            render(form)
        }
    }

    private fun edit(http: HttpRequest, dao: DataAccessObject) {
        val id = http.pathParams["userid"]?.toIntOrNull()
        if (id == null) {
            http.response.sendError(404)
        } else {
            val user = dao.findUser(id)
            if (user == null) {
                http.response.sendError(404)
            } else {
                with(http) {
                    view = UserEditView(user)
                    render(form)
                }
            }
        }
    }

    private fun commit(http: HttpRequest, dao: DataAccessObject) {
        val id = http.param("userid")?.toIntOrNull()
        if (id == null) {
            http.response.sendError(400)
            return
        }

        val user = User(id)
        with(user) {
            givenname = http.param("givenname")
            lastname = http.param("lastname")
            mail = http.param("mail")
        }

        if (user.id > 0) {
            logger().info("Update user with id ${user.id}.")
            dao.updateUser(user)
            http.renderCommit("users/")
        } else {
            val errorMessages = mutableListOf<String>()
            user.username = http.param("username", {
                if (it == null) ValidationError("validation.username.null")
                else if (dao.findUserByName(it) != null) ValidationError("validation.username.unique")
                else ValidatedValue(it)
            }, "", errorMessages)

            if (errorMessages.isEmpty()) {
                logger().info("Insert user ${user.username}.")
                dao.insertUser(user)
                http.renderCommit("users/")
            } else {
                http.view = UserEditView(user).apply { this.errorMessages = errorMessages }
                http.render(form)
            }
        }
    }
}