<?php

declare(strict_types=1);

namespace PhpMyAdmin\Controllers\Table\Structure;

use PhpMyAdmin\CheckUserPrivileges;
use PhpMyAdmin\Controllers\AbstractController;
use PhpMyAdmin\DatabaseInterface;
use PhpMyAdmin\Message;
use PhpMyAdmin\ResponseRenderer;
use PhpMyAdmin\Table\ColumnsDefinition;
use PhpMyAdmin\Template;

use function __;
use function count;

final class ChangeController extends AbstractController
{
    /** @var DatabaseInterface */
    private $dbi;

    /** @var ColumnsDefinition */
    private $columnsDefinition;

    public function __construct(
        ResponseRenderer $response,
        Template $template,
        DatabaseInterface $dbi,
        ColumnsDefinition $columnsDefinition
    ) {
        parent::__construct($response, $template);
        $this->dbi = $dbi;
        $this->columnsDefinition = $columnsDefinition;
    }

    public function __invoke(): void
    {
        if (isset($_GET['change_column'])) {
            $this->displayHtmlForColumnChange(null);

            return;
        }

        $selected = $_POST['selected_fld'] ?? [];

        if (empty($selected)) {
            $this->response->setRequestStatus(false);
            $this->response->addJSON('message', __('No column selected.'));

            return;
        }

        $this->displayHtmlForColumnChange($selected);
    }

    /**
     * Displays HTML for changing one or more columns
     *
     * @param array|null $selected the selected columns
     */
    private function displayHtmlForColumnChange(?array $selected): void
    {
        $GLOBALS['num_fields'] = $GLOBALS['num_fields'] ?? null;

        if (empty($selected)) {
            $selected[] = $_REQUEST['field'];
            $selected_cnt = 1;
        } else { // from a multiple submit
            $selected_cnt = count($selected);
        }

        /**
         * @todo optimize in case of multiple fields to modify
         */
        $fields_meta = [];
        for ($i = 0; $i < $selected_cnt; $i++) {
            $value = $this->dbi->getColumn($GLOBALS['db'], $GLOBALS['table'], $selected[$i], true);
            if (count($value) === 0) {
                $message = Message::error(
                    __('Failed to get description of column %s!')
                );
                $message->addParam($selected[$i]);
                $this->response->addHTML($message->getDisplay());
            } else {
                $fields_meta[] = $value;
            }
        }

        $GLOBALS['num_fields'] = count($fields_meta);

        /**
         * Form for changing properties.
         */
        $checkUserPrivileges = new CheckUserPrivileges($this->dbi);
        $checkUserPrivileges->getPrivileges();

        $this->addScriptFiles(['vendor/jquery/jquery.uitablefilter.js', 'indexes.js']);

        $this->checkParameters(['server', 'db', 'table', 'num_fields']);

        $templateData = $this->columnsDefinition->displayForm(
            '/table/structure/save',
            $GLOBALS['num_fields'],
            null,
            $selected,
            $fields_meta
        );

        $this->render('columns_definitions/column_definitions_form', $templateData);
    }
}