<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

namespace biblocks_info;

use Exception;
use local_kopere_bi\block\i_block_provider;
use local_kopere_bi\block\util\cache_util;
use local_kopere_bi\block\util\code_util;
use local_kopere_bi\block\util\database_util;
use local_kopere_bi\block\util\sql_util;
use local_kopere_bi\form\dynamic_moodleform;
use local_kopere_dashboard\util\message;

/**
 * Class info
 *
 * @package   biblocks_info
 * @copyright 2026 Eduardo Kraus {@link https://eduardokraus.com}
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class provider implements i_block_provider {

    /**
     * Function get_name
     *
     * @return string
     * @throws Exception
     */
    public static function get_name() {
        return get_string("pluginname", "biblocks_info");
    }

    /**
     * Function get_description
     *
     * @return string
     * @throws Exception
     */
    public static function get_description() {
        return get_string("pluginname_desc", "biblocks_info");
    }

    /**
     * Function title_extra
     *
     * @param $koperebielement
     * @return string
     */
    public function title_extra($koperebielement) {
        return "";
    }

    /**
     * Function edit
     *
     * @param dynamic_moodleform $form
     * @param $koperebielement
     * @return void
     * @throws Exception
     */
    public function edit(dynamic_moodleform $form, $koperebielement) {

        $html = message::warning(get_string("info_sql_warning", "local_kopere_bi"));
        $form->add_html($html);

        code_util::input_commandsql($form, $koperebielement);
    }

    /**
     * Function is_edit_columns
     *
     * @return bool
     */
    public function is_edit_columns() {
        return false;
    }

    /**
     * Function edit_columns
     *
     * @param dynamic_moodleform $form
     * @param $koperebielement
     * @return void
     */
    public function edit_columns(dynamic_moodleform $form, $koperebielement) {
    }

    /**
     * Function preview
     *
     * @param $koperebielement
     * @return string
     * @throws Exception
     */
    public function preview($koperebielement) {
        global $OUTPUT;

        $cache = cache_util::get_cache_make($koperebielement->cache);

        if (false && $cache->has($koperebielement->id)) {
            $retorno = $cache->get($koperebielement->id);
        } else {

            $comand = sql_util::prepare_sql($koperebielement->commandsql);

            try {
                $line = (new database_util())->get_record_sql_block($comand->sql, $comand->params);
            } catch (Exception $e) {
                if (AJAX_SCRIPT) {
                    echo json_encode([
                        "sql" => $comand->sql,
                        "error" => $e->getMessage(),
                        "trace" => $e->getTraceAsString(),
                    ]);
                    die;
                } else {
                    message::print_danger(get_string("info_error_sql", "local_kopere_bi"));
                    return "";
                }
            }

            $columns = $line ? array_values((array) $line) : [];
            $value = count($columns) ? $this->format_value(reset($columns)) : "-";

            $retorno = $OUTPUT->render_from_template("biblocks_info/preview", [
                "value" => $value,
            ]);
            $cache->set($koperebielement->id, $retorno);
        }

        return $retorno;
    }

    /**
     * Formats the first SQL column as a clean KPI value.
     *
     * @param mixed $value
     * @return string
     */
    private function format_value($value) {
        if ($value === null || $value === "") {
            return "-";
        }

        if (is_float($value)) {
            return "{$value}";
        }

        if (is_numeric($value)) {
            $number = (float) $value;
            if (floor($number) == $number) {
                return number_format($number, 0, "", ".");
            }
        }

        return "{$value}";
    }

    /**
     * Function get_chart_data
     *
     * @param $koperebielement
     * @return void
     */
    public function get_chart_data($koperebielement) {
    }
}
