<?php

namespace Blocksy;

class WooVariationImagesImportExport {
	private $export_type = 'product';
	private $column_id = 'blocksy_variation_images';

	public function __construct() {
		add_filter(
			"woocommerce_product_export_{$this->export_type}_default_columns",
			[$this, 'export_column_name']
		);
		add_filter(
			'woocommerce_product_export_column_names',
			[$this, 'export_column_name']
		);

		add_filter(
			"woocommerce_product_export_{$this->export_type}_column_{$this->column_id}",
			[$this, 'export_column_data'],
			10, 3
		);

		add_filter(
			'woocommerce_csv_product_import_mapping_options',
			[$this, 'export_column_name']
	   	);
		add_filter(
			'woocommerce_csv_product_import_mapping_default_columns',
			[$this, 'default_import_column_name']
	   	);
		add_action(
			'woocommerce_product_import_inserted_product_object',
			[$this, 'process_wc_import'],
			10, 2
		);
	}

	public function export_column_name($columns) {
		$columns[$this->column_id] = __('Blocksy Variation Images', 'blocksy');

		return $columns;
	}

	public function default_import_column_name($columns) {
		$columns[__('Blocksy Variation Images', 'blocksy')] = $this->column_id;

		return $columns;
	}

	public function export_column_data($value, $product, $column_id) {
		if ($product->get_type() !== 'variation') {
			return '';
		}

		$product_id = $product->get_id();

		$gallery_images = get_post_meta(
			$product_id,
			'blocksy_post_meta_options',
			true
		);

		if (empty($gallery_images)) {
			return '';
		}

		return json_encode($gallery_images);
	}

	public function process_wc_import($product, $data) {
		$product_id = $product->get_id();

		if (! isset($data[$this->column_id])) {
			return;
		}

		if (empty($data[$this->column_id])) {
			return;
		}

		$raw_data = json_decode($data[$this->column_id], true);

		if (! $raw_data) {
			return;
		}

		if (
			isset($raw_data['images'])
			&&
			! empty($raw_data['images'])
		) {
			$gallery_images = [];

			foreach ($raw_data['images'] as $image) {
				$attachment_id = \Blocksy\WooImportExport::get_attachment_id_from_url($image['url'], $product_id);

				if (is_wp_error($attachment_id)) {
					continue;
				}

				$gallery_images[] = [
					'attachment_id' => $attachment_id,
					'url' => wp_get_attachment_url($attachment_id)
				];
			}

			if (! empty($gallery_images)) {
				$raw_data['images'] = $gallery_images;
			}
		}

		update_post_meta(
			$product_id,
			'blocksy_post_meta_options',
			$raw_data
		);
	}
}