<?php

function admin_questions_title()
{
    return _("Answer questions");
}

/**
 * Renders a hint for new questions to answer.
 */
function admin_new_questions()
{
    global $privileges, $page;

    if ($page != "admin_questions") {
        if (in_array("admin_questions", $privileges)) {
            $new_messages = sql_num_query("SELECT * FROM `Questions` WHERE `AID` IS NULL");

            if ($new_messages > 0) {
                return '<a href="' . page_link_to("admin_questions") . '">' . _('There are unanswered questions!') . '</a>';
            }
        }
    }

    return null;
}

function admin_questions()
{
    global $user;

    if (!isset($_REQUEST['action'])) {
        $unanswered_questions_table = [];
        $questions = sql_select("SELECT * FROM `Questions` WHERE `AID` IS NULL");
        foreach ($questions as $question) {
            $user_source = User($question['UID']);

            $unanswered_questions_table[] = [
                'from'     => User_Nick_render($user_source),
                'question' => str_replace("\n", "<br />", $question['Question']),
                'answer'   => form([
                    form_textarea('answer', '', ''),
                    form_submit('submit', _("Save"))
                ], page_link_to('admin_questions') . '&action=answer&id=' . $question['QID']),
                'actions'  => button(
                    page_link_to("admin_questions") . '&action=delete&id=' . $question['QID'],
                    _("delete"),
                    'btn-xs'
                )
            ];
        }

        $answered_questions_table = [];
        $questions = sql_select("SELECT * FROM `Questions` WHERE NOT `AID` IS NULL");
        foreach ($questions as $question) {
            $user_source = User($question['UID']);
            $answer_user_source = User($question['AID']);
            $answered_questions_table[] = [
                'from'        => User_Nick_render($user_source),
                'question'    => str_replace("\n", "<br />", $question['Question']),
                'answered_by' => User_Nick_render($answer_user_source),
                'answer'      => str_replace("\n", "<br />", $question['Answer']),
                'actions'     => button(
                    page_link_to("admin_questions") . '&action=delete&id=' . $question['QID'],
                    _("delete"),
                    'btn-xs'
                )
            ];
        }

        return page_with_title(admin_questions_title(), [
            '<h2>' . _("Unanswered questions") . '</h2>',
            table([
                'from'     => _("From"),
                'question' => _("Question"),
                'answer'   => _("Answer"),
                'actions'  => ''
            ], $unanswered_questions_table),
            '<h2>' . _("Answered questions") . '</h2>',
            table([
                'from'        => _("From"),
                'question'    => _("Question"),
                'answered_by' => _("Answered by"),
                'answer'      => _("Answer"),
                'actions'     => ''
            ], $answered_questions_table)
        ]);
    } else {
        switch ($_REQUEST['action']) {
            case 'answer':
                if (isset($_REQUEST['id']) && preg_match("/^[0-9]{1,11}$/", $_REQUEST['id'])) {
                    $question_id = $_REQUEST['id'];
                } else {
                    return error("Incomplete call, missing Question ID.", true);
                }

                $question = sql_select("SELECT * FROM `Questions` WHERE `QID`='" . sql_escape($question_id) . "' LIMIT 1");
                if (count($question) > 0 && $question[0]['AID'] == null) {
                    $answer = trim(
                        preg_replace("/([^\p{L}\p{P}\p{Z}\p{N}\n]{1,})/ui",
                            '',
                            strip_tags($_REQUEST['answer'])
                        ));

                    if ($answer != "") {
                        sql_query("
                            UPDATE `Questions`
                            SET `AID`='" . sql_escape($user['UID']) . "', `Answer`='" . sql_escape($answer) . "'
                            WHERE `QID`='" . sql_escape($question_id) . "'
                            LIMIT 1
                        ");
                        engelsystem_log("Question " . $question[0]['Question'] . " answered: " . $answer);
                        redirect(page_link_to("admin_questions"));
                    } else {
                        return error("Enter an answer!", true);
                    }
                } else {
                    return error("No question found.", true);
                }
                break;
            case 'delete':
                if (isset($_REQUEST['id']) && preg_match("/^[0-9]{1,11}$/", $_REQUEST['id'])) {
                    $question_id = $_REQUEST['id'];
                } else {
                    return error("Incomplete call, missing Question ID.", true);
                }

                $question = sql_select("SELECT * FROM `Questions` WHERE `QID`='" . sql_escape($question_id) . "' LIMIT 1");
                if (count($question) > 0) {
                    sql_query("DELETE FROM `Questions` WHERE `QID`='" . sql_escape($question_id) . "' LIMIT 1");
                    engelsystem_log("Question deleted: " . $question[0]['Question']);
                    redirect(page_link_to("admin_questions"));
                } else {
                    return error("No question found.", true);
                }
                break;
        }
    }
}