<?php

/**
 * @package     MokoSuiteOpenGraph
 * @subpackage  com_mokoog
 * @author      Moko Consulting <hello@mokoconsulting.tech>
 * @copyright   Copyright (C) 2026 Moko Consulting. All rights reserved.
 * @license     GNU General Public License version 3 or later; see LICENSE
 */

namespace Joomla\Component\MokoOG\Administrator\Model;

defined('_JEXEC') or die;

use Joomla\CMS\MVC\Model\BaseDatabaseModel;

/**
 * Read-only model providing OG tag coverage metrics for the dashboard.
 */
class DashboardModel extends BaseDatabaseModel
{
    /**
     * Overall coverage statistics for com_content articles.
     *
     * @return  array{total:int, with_og:int, coverage:int, missing_title:int, missing_description:int, missing_image:int}
     */
    public function getStats(): array
    {
        $db = $this->getDatabase();

        $total         = $this->countContent();
        $withOg        = $this->countDistinct();
        $missingTitle  = $this->countEmptyField('og_title');
        $missingDesc   = $this->countEmptyField('og_description');
        $missingImage  = $this->countEmptyField('og_image');

        return [
            'total'               => $total,
            'with_og'             => $withOg,
            'coverage'            => $total > 0 ? (int) round(($withOg / $total) * 100) : 0,
            'missing_title'       => $missingTitle,
            'missing_description' => $missingDesc,
            'missing_image'       => $missingImage,
        ];
    }

    /**
     * Coverage broken down by content_type.
     *
     * @return  array  Rows of {content_type, total, with_title, with_image}
     */
    public function getCoverageByType(): array
    {
        $db    = $this->getDatabase();
        $empty = $db->quote('');

        $query = $db->getQuery(true)
            ->select([
                $db->quoteName('content_type'),
                'COUNT(*) AS ' . $db->quoteName('total'),
                'SUM(CASE WHEN ' . $db->quoteName('og_title') . ' <> ' . $empty . ' THEN 1 ELSE 0 END) AS ' . $db->quoteName('with_title'),
                'SUM(CASE WHEN ' . $db->quoteName('og_image') . ' <> ' . $empty . ' THEN 1 ELSE 0 END) AS ' . $db->quoteName('with_image'),
            ])
            ->from($db->quoteName('#__mokoog_tags'))
            ->where($db->quoteName('published') . ' = 1')
            ->group($db->quoteName('content_type'))
            ->order($db->quoteName('content_type') . ' ASC');

        $db->setQuery($query);

        return $db->loadObjectList() ?: [];
    }

    /**
     * Published articles that have no OG tag yet.
     *
     * @param   int  $limit  Maximum rows to return
     *
     * @return  array  Rows of {id, title}
     */
    public function getMissingArticles(int $limit = 20): array
    {
        $db = $this->getDatabase();

        $query = $db->getQuery(true)
            ->select([$db->quoteName('c.id'), $db->quoteName('c.title')])
            ->from($db->quoteName('#__content', 'c'))
            ->leftJoin(
                $db->quoteName('#__mokoog_tags', 't')
                . ' ON ' . $db->quoteName('t.content_type') . ' = ' . $db->quote('com_content')
                . ' AND ' . $db->quoteName('t.content_id') . ' = ' . $db->quoteName('c.id')
            )
            ->where($db->quoteName('c.state') . ' = 1')
            ->where($db->quoteName('t.id') . ' IS NULL')
            ->order($db->quoteName('c.id') . ' DESC');

        $db->setQuery($query, 0, max(1, $limit));

        return $db->loadObjectList() ?: [];
    }

    /**
     * Count published com_content articles.
     */
    private function countContent(): int
    {
        $db = $this->getDatabase();
        $db->setQuery(
            $db->getQuery(true)
                ->select('COUNT(*)')
                ->from($db->quoteName('#__content'))
                ->where($db->quoteName('state') . ' = 1')
        );

        return (int) $db->loadResult();
    }

    /**
     * Count distinct articles that have at least one published OG tag.
     */
    private function countDistinct(): int
    {
        $db = $this->getDatabase();
        $db->setQuery(
            $db->getQuery(true)
                ->select('COUNT(DISTINCT ' . $db->quoteName('content_id') . ')')
                ->from($db->quoteName('#__mokoog_tags'))
                ->where($db->quoteName('content_type') . ' = ' . $db->quote('com_content'))
                ->where($db->quoteName('published') . ' = 1')
        );

        return (int) $db->loadResult();
    }

    /**
     * Count published OG tag rows whose given field is empty.
     *
     * @param   string  $field  One of og_title, og_description, og_image
     */
    private function countEmptyField(string $field): int
    {
        // Whitelist the column name — it is never user input here, but keep it strict.
        if (!\in_array($field, ['og_title', 'og_description', 'og_image'], true)) {
            return 0;
        }

        $db = $this->getDatabase();
        $db->setQuery(
            $db->getQuery(true)
                ->select('COUNT(*)')
                ->from($db->quoteName('#__mokoog_tags'))
                ->where($db->quoteName('content_type') . ' = ' . $db->quote('com_content'))
                ->where($db->quoteName('published') . ' = 1')
                ->where($db->quoteName($field) . ' = ' . $db->quote(''))
        );

        return (int) $db->loadResult();
    }
}