<?php
class AIT_IAT_Cron_Runner {
    
    public function __construct() {
        register_activation_hook(AIT_IAT_FILE, [ $this, 'schedule_cron' ]);
        register_deactivation_hook(AIT_IAT_FILE, [ $this, 'clear_cron' ]);
        add_action('ait_iat_cron_bulk_generate', [ $this, 'run_cron_bulk' ]);
        add_action('admin_init', [ $this, 'maybe_schedule_cron' ]);
    }

    public function schedule_cron() {
        if (!wp_next_scheduled('ait_iat_cron_bulk_generate')) {
            wp_schedule_event(time(), 'hourly', 'ait_iat_cron_bulk_generate');
        }
    }

    public function maybe_schedule_cron() {
        if (AIT_IAT_Settings::get('job_tick_interval_seconds') && !wp_next_scheduled('ait_iat_cron_bulk_generate')) {
            wp_schedule_event(time(), 'hourly', 'ait_iat_cron_bulk_generate');
        }
    }

    public function clear_cron() {
        wp_clear_scheduled_hook('ait_iat_cron_bulk_generate');
    }

    public function run_cron_bulk() {

        if (!AIT_IAT_Settings::get('job_tick_interval_seconds')) { return; }

        $limit = intval(AIT_IAT_Settings::get('bulk_alt_limit'));
        $supported_mime_types = AIT_IAT_Settings::get_supported_mime_types();

        $query_args = [
            'post_type'      => 'attachment',
            'post_mime_type' => $supported_mime_types,
            'post_status'    => 'inherit',
            'posts_per_page' => $limit,
            'meta_query'     => [
                [
                    'key'     => '_wp_attachment_image_alt',
                    'compare' => 'NOT EXISTS'
                ]
            ]
        ];

        $attachments = get_posts($query_args);
        $updated = 0;

        foreach ($attachments as $attachment) {

            $mime = get_post_mime_type($attachment->ID);
            if (! AIT_IAT_Media_Handler::mime_is_supported($mime, $supported_mime_types)) continue;

            $json_alt_fields = apply_filters('ait_iat_generate_alt_text', [], $attachment->ID, null);
                    
        if ( ! empty( $json_alt_fields ) ) {
            update_post_meta($attachment->ID, '_wp_attachment_image_alt', $json_alt_fields['alt_text']);
            do_action('ait_iat_alt_generated', $attachment->ID, $json_alt_fields['alt_text']);

            if ( ! empty( $json_alt_fields['caption'] ) || ! empty( $json_alt_fields['title'] ) || ! empty( $json_alt_fields['description'] ) ) {

                $args = ['ID' => $attachment->ID];

                if ( ! empty( $json_alt_fields['title'] ) ) { $args['post_title'] = $json_alt_fields['title']; }
                if ( ! empty( $json_alt_fields['caption'] ) ) { $args['post_excerpt'] = $json_alt_fields['caption']; }
                if ( ! empty( $json_alt_fields['description'] ) ) { $args['post_content'] = $json_alt_fields['description']; }

                wp_update_post( $args );

                if ( ! empty( $json_alt_fields['filename'] ) ) { AIT_IAT_Alt_Generator::maybe_rename_attachment_file( $attachment->ID, $json_alt_fields['filename'] ); }
            }
                $updated++;
            }
        }

        if (is_admin()) {

            /* translators: number of images updated */
            update_option('ait_iat_admin_notice', sprintf(__('Scheduled alt text generation completed: %d images updated.', 'ai-image-alt-text'), $updated));
        }
    }
}