<?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_pie;

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\reload_util;
use local_kopere_bi\block\util\sql_util;
use local_kopere_bi\form\dynamic_moodleform;
use local_kopere_dashboard\util\message;

/**
 * Class pie
 *
 * @package   biblocks_pie
 * @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_pie");
    }

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

    /**
     * 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("pie_sql_warning", "biblocks_pie"));
        $form->add_html($html);

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

        if (isset($koperebielement->info_obj["chart_options"])) {
            code_util::options($form, $koperebielement->info_obj["chart_options"]);
        } else {
            code_util::options(
                $form, trim(
                    "
{
    colors : [\"#2E93fA\", \"#66DA26\", \"#546E7A\", \"#E91E63\", \"#FF9800\"],
}"
                )
            );
        }
    }

    /**
     * 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;

        $return = code_util::add_js_apexcharts();

        return $return . $OUTPUT->render_from_template("biblocks_pie/preview", [
                "ajax_url" => "view-ajax.php?classname=chart_data&method=load_data&" .
                    http_build_query(["item_id" => $koperebielement->id], "", "&"),
                "element_id" => $koperebielement->id,
                "chart_pie_default" => get_config("local_kopere_bi", "chart_pie_default"),
                "chart_options" => code_util::get_js_options($koperebielement->info_obj["chart_options"]),
                "code_util_get_js_theme" => code_util::get_js_theme($koperebielement),
                "error_chart_renderer" => get_string("error_chart_renderer", "local_kopere_bi"),
                "error_data_loader" => get_string("error_data_loader", "local_kopere_bi"),
                "reload_time" => reload_util::convert($koperebielement->reload),
            ]);
    }

    /**
     * Function get_chart_data
     *
     * @param $koperebielement
     * @return void
     * @throws Exception
     */
    public function get_chart_data($koperebielement) {
        $cache = cache_util::get_cache_make($koperebielement->cache);

        if (false && $cache->has($koperebielement->id)) {
            $lines = $cache->get($koperebielement->id);
        } else {
            $comand = sql_util::prepare_sql($koperebielement->commandsql);
            try {
                $rows = (new database_util())->get_records_sql_block_array($comand->sql, $comand->params);
            } catch (Exception $e) {
                if (AJAX_SCRIPT) {
                    echo json_encode([
                        "sql" => $comand->sql,
                        "error" => $e->getMessage(),
                        "trace" => $e->getTraceAsString(),
                    ]);
                    die;
                } else {
                    message::print_danger($e->getMessage());
                    return;
                }
            }

            $keys = [];
            foreach ($rows[0] as $key => $value) {
                if (!isset($keys[0])) {
                    $keys[0] = $key;
                } else if (!isset($keys[1])) {
                    $keys[1] = $key;
                } else {
                    break;
                }
            }

            $optionslabels = [];
            $optionsserie = [];
            foreach ($rows as $row) {
                $optionslabels[] = $row[$keys[0]];
                $optionsserie[] = $row[$keys[1]];
            }

            $lines = [
                "labels" => $optionslabels,
                "series" => $optionsserie,
            ];
            $cache->set($koperebielement->id, $lines);
        }

        ob_clean();
        header('Content-Type: application/json; charset: utf-8');
        echo json_encode($lines, JSON_NUMERIC_CHECK);
        die();
    }
}
