<?php
if (!defined('WPINC')) {
    die;
}

class Studiou_WC_FPP_Admin {

    /** @var Studiou_WC_FPP_DB */
    private $db;

    public function __construct($db) {
        $this->db = $db;

        // AJAX handlers
        add_action('wp_ajax_studiou_wcfpp_update_status', array($this, 'ajax_update_status'));
        add_action('wp_ajax_studiou_wcfpp_delete_files', array($this, 'ajax_delete_files'));
        add_action('wp_ajax_studiou_wcfpp_download_zip', array($this, 'ajax_download_zip'));
        add_action('wp_ajax_studiou_wcfpp_download_csv', array($this, 'ajax_download_csv'));
        add_action('wp_ajax_studiou_wcfpp_bulk_status', array($this, 'ajax_bulk_status'));

        // Handle direct ZIP / CSV download and file download (marks as downloaded)
        add_action('admin_init', array($this, 'handle_zip_download'));
        add_action('admin_init', array($this, 'handle_csv_download'));
        add_action('admin_init', array($this, 'handle_file_download'));
    }

    public function render_summary_page() {
        // Process filters
        $current_status  = isset($_GET['status']) ? sanitize_text_field($_GET['status']) : '';
        $current_product = isset($_GET['product_id']) ? absint($_GET['product_id']) : 0;
        $current_order   = isset($_GET['order_id']) ? absint($_GET['order_id']) : 0;
        $current_search  = isset($_GET['s']) ? sanitize_text_field($_GET['s']) : '';
        $current_page    = isset($_GET['paged']) ? max(1, absint($_GET['paged'])) : 1;
        $per_page        = 30;

        $allowed_orderby = array('order_id', 'status', 'created_at');
        $orderby_in      = isset($_GET['orderby']) ? sanitize_text_field($_GET['orderby']) : 'created_at';
        $orderby         = in_array($orderby_in, $allowed_orderby, true) ? $orderby_in : 'created_at';
        $order_in        = isset($_GET['order']) ? strtoupper(sanitize_text_field($_GET['order'])) : 'DESC';
        $order           = ($order_in === 'ASC') ? 'ASC' : 'DESC';

        $args = array(
            'status'     => $current_status,
            'product_id' => $current_product,
            'order_id'   => $current_order,
            'search'     => $current_search,
            'limit'      => $per_page,
            'offset'     => ($current_page - 1) * $per_page,
            'orderby'    => $orderby,
            'order'      => $order,
        );

        $records     = $this->db->get_file_records($args);
        $total       = $this->db->count_file_records($args);
        $total_pages = ceil($total / $per_page);

        // Get products that have FPP enabled for filter dropdown
        $fpp_products = $this->get_fpp_products();

        // Expose active sort to the view
        $current_orderby = $orderby;
        $current_order_dir = $order;

        include STUDIOU_WCFPP_PLUGIN_DIR . 'views/admin-summary.php';
    }

    private function get_fpp_products() {
        $args = array(
            'post_type'      => 'product',
            'post_status'    => 'publish',
            'posts_per_page' => -1,
            'meta_query'     => array(
                array(
                    'key'   => '_studiou_fpp_enabled',
                    'value' => 'yes',
                ),
            ),
            'fields' => 'ids',
        );
        $product_ids = get_posts($args);
        $products = array();
        foreach ($product_ids as $pid) {
            $products[$pid] = get_the_title($pid);
        }
        return $products;
    }

    public function ajax_update_status() {
        check_ajax_referer('studiou-wcfpp-nonce', 'nonce');

        if (!current_user_can('manage_woocommerce')) {
            wp_send_json_error(array('message' => __('Insufficient permissions.', 'studiou-wc-free-photo-product')));
            return;
        }

        $file_id = isset($_POST['file_id']) ? absint($_POST['file_id']) : 0;
        $status = isset($_POST['status']) ? sanitize_text_field($_POST['status']) : '';

        if (!$file_id || !$status) {
            wp_send_json_error(array('message' => __('Invalid data.', 'studiou-wc-free-photo-product')));
            return;
        }

        $result = $this->db->update_file_status($file_id, $status);
        if ($result === false) {
            wp_send_json_error(array('message' => __('Failed to update status.', 'studiou-wc-free-photo-product')));
            return;
        }

        wp_send_json_success(array('message' => __('Status updated.', 'studiou-wc-free-photo-product')));
    }

    public function ajax_bulk_status() {
        check_ajax_referer('studiou-wcfpp-nonce', 'nonce');

        if (!current_user_can('manage_woocommerce')) {
            wp_send_json_error(array('message' => __('Insufficient permissions.', 'studiou-wc-free-photo-product')));
            return;
        }

        $file_ids = isset($_POST['file_ids']) ? array_map('absint', (array) $_POST['file_ids']) : array();
        $status = isset($_POST['status']) ? sanitize_text_field($_POST['status']) : '';

        if (empty($file_ids) || !$status) {
            wp_send_json_error(array('message' => __('Invalid data.', 'studiou-wc-free-photo-product')));
            return;
        }

        $updated = 0;
        foreach ($file_ids as $fid) {
            if ($this->db->update_file_status($fid, $status)) {
                $updated++;
            }
        }

        wp_send_json_success(array(
            'message' => sprintf(__('%d file(s) updated.', 'studiou-wc-free-photo-product'), $updated),
        ));
    }

    public function ajax_delete_files() {
        check_ajax_referer('studiou-wcfpp-nonce', 'nonce');

        if (!current_user_can('manage_woocommerce')) {
            wp_send_json_error(array('message' => __('Insufficient permissions.', 'studiou-wc-free-photo-product')));
            return;
        }

        $file_ids = isset($_POST['file_ids']) ? array_map('absint', (array) $_POST['file_ids']) : array();
        if (empty($file_ids)) {
            wp_send_json_error(array('message' => __('No files selected.', 'studiou-wc-free-photo-product')));
            return;
        }

        $deleted = 0;
        foreach ($file_ids as $fid) {
            if ($this->db->delete_file_record($fid)) {
                $deleted++;
            }
        }

        wp_send_json_success(array(
            'message' => sprintf(__('%d file(s) deleted.', 'studiou-wc-free-photo-product'), $deleted),
        ));
    }

    public function ajax_download_zip() {
        check_ajax_referer('studiou-wcfpp-nonce', 'nonce');

        if (!current_user_can('manage_woocommerce')) {
            wp_send_json_error(array('message' => __('Insufficient permissions.', 'studiou-wc-free-photo-product')));
            return;
        }

        $file_ids = isset($_POST['file_ids']) ? array_map('absint', (array) $_POST['file_ids']) : array();
        if (empty($file_ids)) {
            wp_send_json_error(array('message' => __('No files selected.', 'studiou-wc-free-photo-product')));
            return;
        }

        $records = $this->db->get_file_records_by_ids($file_ids);
        if (empty($records)) {
            wp_send_json_error(array('message' => __('No files found.', 'studiou-wc-free-photo-product')));
            return;
        }

        // Generate ZIP
        $upload_dir = wp_upload_dir();
        $zip_name = 'fpp-files-' . date('Y-m-d-His') . '.zip';
        $zip_path = $upload_dir['basedir'] . '/studiou-fpp-chunks/' . $zip_name;

        if (!class_exists('ZipArchive')) {
            wp_send_json_error(array('message' => __('ZIP extension not available on server.', 'studiou-wc-free-photo-product')));
            return;
        }

        $zip = new ZipArchive();
        if ($zip->open($zip_path, ZipArchive::CREATE) !== true) {
            wp_send_json_error(array('message' => __('Could not create ZIP file.', 'studiou-wc-free-photo-product')));
            return;
        }

        $added = 0;
        foreach ($records as $record) {
            $file_path = wp_get_original_image_path($record->attachment_id);
            if (!$file_path) {
                $file_path = get_attached_file($record->attachment_id);
            }
            if ($file_path && file_exists($file_path)) {
                // Use order number prefix if available
                $prefix = $record->order_id ? 'order-' . $record->order_id . '_' : '';
                $zip->addFile($file_path, $prefix . $record->file_name);
                $added++;
            }
        }
        $zip->close();

        if ($added === 0) {
            if (file_exists($zip_path)) {
                unlink($zip_path);
            }
            wp_send_json_error(array('message' => __('No files could be added to archive.', 'studiou-wc-free-photo-product')));
            return;
        }

        // Generate a nonce-protected download URL
        $download_url = add_query_arg(array(
            'studiou_fpp_download' => 1,
            'file' => $zip_name,
            '_wpnonce' => wp_create_nonce('studiou-fpp-zip-download'),
        ), admin_url('admin.php'));

        wp_send_json_success(array(
            'download_url' => $download_url,
            'file_count'   => $added,
        ));
    }

    public function handle_zip_download() {
        if (!isset($_GET['studiou_fpp_download']) || !isset($_GET['file'])) {
            return;
        }

        if (!wp_verify_nonce($_GET['_wpnonce'], 'studiou-fpp-zip-download')) {
            wp_die(__('Security check failed.', 'studiou-wc-free-photo-product'));
        }

        if (!current_user_can('manage_woocommerce')) {
            wp_die(__('Insufficient permissions.', 'studiou-wc-free-photo-product'));
        }

        $file_name = sanitize_file_name($_GET['file']);
        $upload_dir = wp_upload_dir();
        $file_path = $upload_dir['basedir'] . '/studiou-fpp-chunks/' . $file_name;

        if (!file_exists($file_path) || pathinfo($file_name, PATHINFO_EXTENSION) !== 'zip') {
            wp_die(__('File not found.', 'studiou-wc-free-photo-product'));
        }

        header('Content-Type: application/zip');
        header('Content-Disposition: attachment; filename="' . $file_name . '"');
        header('Content-Length: ' . filesize($file_path));
        header('Pragma: no-cache');

        readfile($file_path);

        // Clean up the ZIP file after download
        unlink($file_path);
        exit;
    }

    public function ajax_download_csv() {
        check_ajax_referer('studiou-wcfpp-nonce', 'nonce');

        if (!current_user_can('manage_woocommerce')) {
            wp_send_json_error(array('message' => __('Insufficient permissions.', 'studiou-wc-free-photo-product')));
            return;
        }

        $file_ids = isset($_POST['file_ids']) ? array_map('absint', (array) $_POST['file_ids']) : array();
        if (empty($file_ids)) {
            wp_send_json_error(array('message' => __('No files selected.', 'studiou-wc-free-photo-product')));
            return;
        }

        $records = $this->db->get_file_records_by_ids($file_ids);
        if (empty($records)) {
            wp_send_json_error(array('message' => __('No files found.', 'studiou-wc-free-photo-product')));
            return;
        }

        $upload_dir = wp_upload_dir();
        $csv_name   = 'fpp-records-' . date('Y-m-d-His') . '.csv';
        $csv_dir    = $upload_dir['basedir'] . '/studiou-fpp-chunks';
        if (!file_exists($csv_dir)) {
            wp_mkdir_p($csv_dir);
        }
        $csv_path = $csv_dir . '/' . $csv_name;

        $fh = fopen($csv_path, 'wb');
        if (!$fh) {
            wp_send_json_error(array('message' => __('Could not create CSV file.', 'studiou-wc-free-photo-product')));
            return;
        }

        // UTF-8 BOM so Excel opens the file with the correct encoding
        fwrite($fh, "\xEF\xBB\xBF");

        // Header row — column labels translated
        fputcsv($fh, array(
            __('ID', 'studiou-wc-free-photo-product'),
            __('File Name', 'studiou-wc-free-photo-product'),
            __('Product', 'studiou-wc-free-photo-product'),
            __('Variation ID', 'studiou-wc-free-photo-product'),
            __('Order', 'studiou-wc-free-photo-product'),
            __('Customer', 'studiou-wc-free-photo-product'),
            __('Status', 'studiou-wc-free-photo-product'),
            __('Date', 'studiou-wc-free-photo-product'),
            __('File URL', 'studiou-wc-free-photo-product'),
        ));

        foreach ($records as $record) {
            $product_title = get_the_title($record->product_id);

            if ((int) $record->customer_id > 0) {
                $user = get_userdata((int) $record->customer_id);
                $customer_name = $user ? $user->display_name : '#' . (int) $record->customer_id;
            } else {
                $customer_name = __('Guest', 'studiou-wc-free-photo-product');
            }

            $file_url = wp_get_attachment_url((int) $record->attachment_id);

            fputcsv($fh, array(
                (int) $record->id,
                (string) $record->file_name,
                (string) $product_title,
                (int) $record->variation_id,
                (int) $record->order_id ? '#' . (int) $record->order_id : '',
                (string) $customer_name,
                (string) self::get_status_label($record->status),
                (string) $record->created_at,
                (string) ($file_url ?: ''),
            ));
        }

        fclose($fh);

        $download_url = add_query_arg(array(
            'studiou_fpp_download_csv' => 1,
            'file'     => $csv_name,
            '_wpnonce' => wp_create_nonce('studiou-fpp-csv-download'),
        ), admin_url('admin.php'));

        wp_send_json_success(array(
            'download_url' => $download_url,
            'row_count'    => count($records),
        ));
    }

    public function handle_csv_download() {
        if (!isset($_GET['studiou_fpp_download_csv']) || !isset($_GET['file'])) {
            return;
        }

        if (!wp_verify_nonce($_GET['_wpnonce'] ?? '', 'studiou-fpp-csv-download')) {
            wp_die(__('Security check failed.', 'studiou-wc-free-photo-product'));
        }

        if (!current_user_can('manage_woocommerce')) {
            wp_die(__('Insufficient permissions.', 'studiou-wc-free-photo-product'));
        }

        $file_name  = sanitize_file_name($_GET['file']);
        $upload_dir = wp_upload_dir();
        $file_path  = $upload_dir['basedir'] . '/studiou-fpp-chunks/' . $file_name;

        if (!file_exists($file_path) || pathinfo($file_name, PATHINFO_EXTENSION) !== 'csv') {
            wp_die(__('File not found.', 'studiou-wc-free-photo-product'));
        }

        header('Content-Type: text/csv; charset=UTF-8');
        header('Content-Disposition: attachment; filename="' . $file_name . '"');
        header('Content-Length: ' . filesize($file_path));
        header('Pragma: no-cache');

        readfile($file_path);

        unlink($file_path);
        exit;
    }

    /**
     * Handle single file download — serves the file and marks status as "downloaded".
     */
    public function handle_file_download() {
        if (!isset($_GET['studiou_fpp_download_file'])) {
            return;
        }

        if (!wp_verify_nonce($_GET['_wpnonce'] ?? '', 'studiou-fpp-download-file')) {
            wp_die(__('Security check failed.', 'studiou-wc-free-photo-product'));
        }

        if (!current_user_can('manage_woocommerce')) {
            wp_die(__('Insufficient permissions.', 'studiou-wc-free-photo-product'));
        }

        $file_record_id = isset($_GET['file_record_id']) ? absint($_GET['file_record_id']) : 0;
        $attachment_id = isset($_GET['attachment_id']) ? absint($_GET['attachment_id']) : 0;

        if (!$attachment_id) {
            wp_die(__('File not found.', 'studiou-wc-free-photo-product'));
        }

        // Mark as downloaded
        if ($file_record_id) {
            $record = $this->db->get_file_record($file_record_id);
            if ($record && $record->status === 'ready') {
                $this->db->update_file_status($file_record_id, 'downloaded');
            }
        }

        // Serve the original (unscaled) file — WP auto-scales images above the big-image threshold.
        $file_path = wp_get_original_image_path($attachment_id);
        if (!$file_path) {
            $file_path = get_attached_file($attachment_id);
        }
        if (!$file_path || !file_exists($file_path)) {
            wp_die(__('File not found.', 'studiou-wc-free-photo-product'));
        }

        $file_name = basename($file_path);
        $mime_type = mime_content_type($file_path) ?: 'application/octet-stream';

        header('Content-Type: ' . $mime_type);
        header('Content-Disposition: attachment; filename="' . $file_name . '"');
        header('Content-Length: ' . filesize($file_path));
        header('Pragma: no-cache');

        readfile($file_path);
        exit;
    }

    public static function get_status_label($status) {
        $labels = array(
            'ready'      => __('Ready', 'studiou-wc-free-photo-product'),
            'downloaded' => __('Downloaded', 'studiou-wc-free-photo-product'),
            'solved'     => __('Solved', 'studiou-wc-free-photo-product'),
        );
        return isset($labels[$status]) ? $labels[$status] : $status;
    }

    public static function get_status_class($status) {
        $classes = array(
            'ready'      => 'studiou-fpp-status-ready',
            'downloaded' => 'studiou-fpp-status-downloaded',
            'solved'     => 'studiou-fpp-status-solved',
        );
        return isset($classes[$status]) ? $classes[$status] : '';
    }

    public static function get_order_edit_url($order_id) {
        if (class_exists('Automattic\WooCommerce\Utilities\OrderUtil')
            && \Automattic\WooCommerce\Utilities\OrderUtil::custom_orders_table_usage_is_enabled()) {
            return admin_url('admin.php?page=wc-orders&action=edit&id=' . $order_id);
        }
        return admin_url('post.php?post=' . $order_id . '&action=edit');
    }
}