<?php
/**
 * Analytics class for Infinico Image Optimizer
 */

// Prevent direct access
if (!defined('ABSPATH')) {
    exit;
}

/**
 * Analytics and statistics class
 */
class IWAC_Analytics {

    /**
     * Constructor
     */
    public function __construct() {
    }

    /**
     * Get conversion stats
     */
    public function get_conversion_stats() {
        global $wpdb;

        $args = array(
            'post_type' => 'attachment',
            'post_mime_type' => 'image',
            'posts_per_page' => -1,
            'post_status' => 'inherit',
        );

        $query = new WP_Query($args);
        $total_images = $query->found_posts;
        $converted_images = 0;
        $total_size = 0;
        $total_size_saved = 0;
        $format_distribution = array('webp' => 0, 'avif' => 0);

        foreach ($query->posts as $post) {
            $metadata = wp_get_attachment_metadata($post->ID);
            
            if (isset($metadata['filesize'])) {
                $total_size += $metadata['filesize'];
            }

            if (isset($metadata['iwac_conversions']) && !empty($metadata['iwac_conversions'])) {
                $converted_images++;
                
                foreach ($metadata['iwac_conversions'] as $format => $conversion_data) {
                    $format_distribution[strtolower($format)]++;
                }
            }
        }

        return array(
            'total_images' => $total_images,
            'converted_images' => $converted_images,
            'pending_images' => $total_images - $converted_images,
            'conversion_rate' => $total_images > 0 ? round(($converted_images / $total_images) * 100) : 0,
            'total_size' => $total_size,
            'total_size_saved' => $total_size_saved,
            'average_compression' => 0,
            'format_distribution' => $format_distribution,
        );
    }

    /**
     * Get recent conversions
     */
    public function get_recent_conversions($limit = 10) {
        global $wpdb;

        $args = array(
            'post_type' => 'attachment',
            'post_mime_type' => 'image',
            'posts_per_page' => $limit,
            'orderby' => 'modified',
            'order' => 'DESC',
            'post_status' => 'inherit',
        );

        $query = new WP_Query($args);
        $conversions = array();

        foreach ($query->posts as $post) {
            $metadata = wp_get_attachment_metadata($post->ID);
            
            if (isset($metadata['iwac_conversions']) && !empty($metadata['iwac_conversions'])) {
                $file = get_attached_file($post->ID);
                $file_size = filesize($file);

                foreach ($metadata['iwac_conversions'] as $format => $conversion_data) {
                    $conversions[] = array(
                        'id' => $post->ID,
                        'file_name' => basename($file),
                        'original_size' => $file_size,
                        'format' => strtoupper($format),
                        'quality' => $conversion_data['quality'],
                        'converted_at' => $conversion_data['converted_at'],
                        'size_saved' => 0, // Calculate based on actual file sizes
                    );
                }
            }
        }

        return $conversions;
    }

    /**
     * Get format distribution chart data
     */
    public function get_format_distribution() {
        $stats = $this->get_conversion_stats();
        $distribution = $stats['format_distribution'];

        $total_conversions = array_sum($distribution);
        
        return array(
            'webp_percent' => $total_conversions > 0 ? round(($distribution['webp'] / $total_conversions) * 100) : 0,
            'avif_percent' => $total_conversions > 0 ? round(($distribution['avif'] / $total_conversions) * 100) : 0,
            'webp_count' => $distribution['webp'],
            'avif_count' => $distribution['avif'],
        );
    }

    /**
     * Get storage saved
     */
    public function get_storage_saved() {
        global $wpdb;

        $args = array(
            'post_type' => 'attachment',
            'post_mime_type' => 'image',
            'posts_per_page' => -1,
            'post_status' => 'inherit',
        );

        $query = new WP_Query($args);
        $total_saved = 0;

        foreach ($query->posts as $post) {
            $metadata = wp_get_attachment_metadata($post->ID);
            
            if (isset($metadata['iwac_conversions']) && !empty($metadata['iwac_conversions'])) {
                // Get original file size
                $file = get_attached_file($post->ID);
                if (file_exists($file)) {
                    $original_size = filesize($file);

                    foreach ($metadata['iwac_conversions'] as $format => $conversion_data) {
                        // Get converted file size
                        $converted_path = dirname($file) . '/' . basename($file, '.' . pathinfo($file, PATHINFO_EXTENSION)) . '.' . $format;
                        if (file_exists($converted_path)) {
                            $converted_size = filesize($converted_path);
                            $saved = $original_size - $converted_size;
                            if ($saved > 0) {
                                $total_saved += $saved;
                            }
                        }
                    }
                }
            }
        }

        return $total_saved;
    }
}