<?php

/**
 * @package     MokoSuiteCross
 * @subpackage  com_mokosuitecross
 * @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
 * SPDX-License-Identifier: GPL-3.0-or-later
 */

namespace Joomla\Component\MokoSuiteCross\Administrator\Helper;

defined('_JEXEC') or die;

use Joomla\CMS\Factory;

class AnalyticsHelper
{
    private static array $dayNames = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];

    public static function getPostingHeatmap(string $serviceType = '', int $days = 90): array
    {
        $db = Factory::getDbo();

        $query = $db->getQuery(true)
            ->select('DAYOFWEEK(' . $db->quoteName('p.posted_at') . ') - 1 AS dow')
            ->select('HOUR(' . $db->quoteName('p.posted_at') . ') AS hr')
            ->select('COUNT(*) AS cnt')
            ->from($db->quoteName('#__mokosuitecross_posts', 'p'))
            ->where($db->quoteName('p.status') . ' = ' . $db->quote('posted'))
            ->where($db->quoteName('p.posted_at') . ' IS NOT NULL');

        if ($days > 0) {
            $since = Factory::getDate('now - ' . $days . ' days')->toSql();
            $query->where($db->quoteName('p.posted_at') . ' >= ' . $db->quote($since));
        }

        if ($serviceType !== '') {
            $query->join('INNER', $db->quoteName('#__mokosuitecross_services', 's') . ' ON ' . $db->quoteName('s.id') . ' = ' . $db->quoteName('p.service_id'))
                ->where($db->quoteName('s.service_type') . ' = ' . $db->quote($serviceType));
        }

        $query->group('dow, hr')
            ->order('dow ASC, hr ASC');

        $db->setQuery($query);
        $rows = $db->loadObjectList();

        $grid = [];

        for ($d = 0; $d < 7; $d++) {
            $grid[$d] = array_fill(0, 24, 0);
        }

        foreach ($rows as $row) {
            $grid[(int) $row->dow][(int) $row->hr] = (int) $row->cnt;
        }

        return $grid;
    }

    public static function getBestTimes(string $serviceType = '', int $days = 90, int $limit = 5): array
    {
        $grid  = self::getPostingHeatmap($serviceType, $days);
        $slots = [];

        foreach ($grid as $dow => $hours) {
            foreach ($hours as $hour => $count) {
                if ($count > 0) {
                    $slots[] = [
                        'day'   => self::$dayNames[$dow],
                        'hour'  => $hour,
                        'count' => $count,
                        'label' => self::$dayNames[$dow] . ' ' . self::formatHour($hour),
                    ];
                }
            }
        }

        usort($slots, static fn($a, $b) => $b['count'] <=> $a['count']);

        return \array_slice($slots, 0, $limit);
    }

    public static function getServiceBreakdown(int $days = 30): array
    {
        $db = Factory::getDbo();

        $query = $db->getQuery(true)
            ->select($db->quoteName('s.service_type'))
            ->select($db->quoteName('s.title', 'service_title'))
            ->select('COUNT(*) AS total')
            ->select('SUM(CASE WHEN ' . $db->quoteName('p.status') . ' = ' . $db->quote('posted') . ' THEN 1 ELSE 0 END) AS success')
            ->select('SUM(CASE WHEN ' . $db->quoteName('p.status') . ' = ' . $db->quote('failed') . ' THEN 1 ELSE 0 END) AS failed')
            ->from($db->quoteName('#__mokosuitecross_posts', 'p'))
            ->join('INNER', $db->quoteName('#__mokosuitecross_services', 's') . ' ON ' . $db->quoteName('s.id') . ' = ' . $db->quoteName('p.service_id'));

        if ($days > 0) {
            $since = Factory::getDate('now - ' . $days . ' days')->toSql();
            $query->where($db->quoteName('p.created') . ' >= ' . $db->quote($since));
        }

        $query->group($db->quoteName(['s.service_type', 's.title']))
            ->order('total DESC');

        $db->setQuery($query);
        $rows = $db->loadObjectList();

        $result = [];

        foreach ($rows as $row) {
            $total   = (int) $row->total;
            $success = (int) $row->success;
            $result[] = [
                'service_type'  => $row->service_type,
                'service_title' => $row->service_title,
                'total'         => $total,
                'success'       => $success,
                'failed'        => (int) $row->failed,
                'success_rate'  => $total > 0 ? round(($success / $total) * 100, 1) : 0.0,
                'avg_per_day'   => $days > 0 ? round($total / $days, 1) : 0.0,
            ];
        }

        return $result;
    }

    public static function getServiceTypes(): array
    {
        $db = Factory::getDbo();

        $query = $db->getQuery(true)
            ->select('DISTINCT ' . $db->quoteName('service_type'))
            ->from($db->quoteName('#__mokosuitecross_services'))
            ->where($db->quoteName('published') . ' = 1')
            ->order($db->quoteName('service_type') . ' ASC');

        $db->setQuery($query);

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

    private static function formatHour(int $hour): string
    {
        if ($hour === 0) {
            return '12:00 AM';
        }

        if ($hour < 12) {
            return $hour . ':00 AM';
        }

        if ($hour === 12) {
            return '12:00 PM';
        }

        return ($hour - 12) . ':00 PM';
    }
}