<?php

namespace WCML\Multicurrency\Analytics;

use WPML\FP\Obj;

abstract class Export implements \IWPML_Backend_Action, \IWPML_REST_Action, \IWPML_DIC_Action {

	const COL_LANGUAGE = 'language';
	const COL_CURRENCY = 'currency';

	/** @var \wpdb $wpdb */
	protected $wpdb;

	public function __construct( \wpdb $wpdb ) {
		$this->wpdb = $wpdb;
	}

	public function add_hooks() {
		add_filter( 'woocommerce_analytics_clauses_join_orders_subquery', [ $this, 'addJoinClauses' ] );
		add_filter( 'woocommerce_analytics_clauses_select_orders_subquery', [ $this, 'addSelectClauses' ] );
		add_filter( 'woocommerce_analytics_clauses_join_products_subquery', [ $this, 'addJoinClauses' ] );
		add_filter( 'woocommerce_analytics_clauses_select_products_subquery', [ $this, 'addSelectClauses' ] );

		add_filter( 'woocommerce_report_orders_export_columns', $this->addColumnTitle( self::COL_LANGUAGE, __( 'Language', 'woocommerce-multilingual' ) ) );
		add_filter( 'woocommerce_report_orders_prepare_export_item', $this->copyProp( self::COL_LANGUAGE ), 10, 2 );

		if ( wcml_is_multi_currency_on() ) {
			add_filter( 'woocommerce_report_orders_export_columns', $this->addColumnTitle( self::COL_CURRENCY, __( 'Currency', 'woocommerce-multilingual' ) ) );
			add_filter( 'woocommerce_report_orders_prepare_export_item', $this->copyProp( self::COL_CURRENCY ), 10, 2 );
			add_filter( 'woocommerce_report_products_export_columns', $this->addColumnTitle( self::COL_CURRENCY, __( 'Currency', 'woocommerce-multilingual' ) ) );
			add_filter( 'woocommerce_report_products_prepare_export_item', $this->copyProp( self::COL_CURRENCY ), 10, 2 );
		}
	}

	/**
	 * @param string $column
	 * @param string $title
	 *
	 * @return callable(array):array
	 */
	private function addColumnTitle( $column, $title ) {
		return Obj::assoc( $column, $title );
	}

	/**
	 * @param string[] $clauses
	 *
	 * @return string[]
	 */
	abstract public function addJoinClauses( $clauses );

	/**
	 * @param string[] $clauses
	 *
	 * @return string[]
	 */
	abstract public function addSelectClauses( $clauses );

	/**
	 * This filter is required for case when the exported file
	 * is generated with the action-scheduler (report sent by email).
	 *
	 * @param string $column
	 *
	 * @return callable(array,array):array
	 */
	public function copyProp( $column ) {
		return function ( $export_item, $item ) use ( $column ) {
			return Obj::assoc( $column, Obj::prop( $column, $item ), $export_item );
		};
	}
}