<?php
/**
 * Booster for WooCommerce - Shipping - Custom Shipping with Shipping Zones
 *
 * @version 3.4.0
 * @since   2.5.6
 * @author  Algoritmika Ltd.
 * @todo    clean up
 */

if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly

if ( ! class_exists( 'WC_Shipping_WCJ_Custom_W_Zones' ) ) :

class WC_Shipping_WCJ_Custom_W_Zones extends WC_Shipping_Method {

	/**
	 * Constructor shipping class
	 *
	 * @version 2.5.6
	 * @since   2.5.6
	 * @access  public
	 * @return  void
	 */
	function __construct( $instance_id = 0 ) {
		$this->init( $instance_id );
	}

	/**
	 * Init settings
	 *
	 * @version 3.4.0
	 * @since   2.5.6
	 * @access  public
	 * @return  void
	 */
	function init( $instance_id ) {

		$this->id                 = 'booster_custom_shipping_w_zones';
		$this->method_title       = get_option( 'wcj_shipping_custom_shipping_w_zones_admin_title', __( 'Booster: Custom Shipping', 'woocommerce-jetpack' ) );
		$this->method_description = __( 'Booster: Custom Shipping Method', 'woocommerce-jetpack' );

		$this->instance_id = absint( $instance_id );
		$this->supports    = array(
			'shipping-zones',
			'instance-settings',
			'instance-settings-modal',
		);

		// Load the settings.
		$this->init_instance_form_fields();
//		$this->init_settings();

		// Define user set variables
		$this->title                      = $this->get_option( 'title' );
		$this->cost                       = $this->get_option( 'cost' );
		$this->min_weight                 = $this->get_option( 'min_weight' );
		$this->max_weight                 = $this->get_option( 'max_weight' );
		$this->type                       = $this->get_option( 'type' );
		$this->apply_formula              = apply_filters( 'booster_option', 'no', $this->get_option( 'apply_formula' ) );
		$this->weight_table_total_rows    = $this->get_option( 'weight_table_total_rows' );
		/* for ( $i = 1; $i <= $this->weight_table_total_rows; $i++ ) {
			$option_name = 'weight_table_weight_row_' . $i;
			$this->{$option_name} = $this->get_option( $option_name );
			$option_name = 'weight_table_cost_row_' . $i;
			$this->{$option_name} = $this->get_option( $option_name );
		} */

		// Save settings in admin
		add_action( 'woocommerce_update_options_shipping_' . $this->id, array( $this, 'process_admin_options' ) );

		// Add weight table rows
		add_filter( 'woocommerce_shipping_instance_form_fields_' . $this->id, array( $this, 'add_table_rows' ) );
	}

	/**
	 * add_table_rows.
	 *
	 * @version 3.4.0
	 * @since   2.6.0
	 */
	function add_table_rows( $instance_form_fields ) {
		if ( $this->instance_id ) {
			$settings = get_option( 'woocommerce_' . $this->id . '_' . $this->instance_id . '_settings' );
			$this->weight_table_total_rows = $settings['weight_table_total_rows'];
			for ( $i = 1; $i <= $this->weight_table_total_rows; $i++ ) {
				if ( ! isset( $instance_form_fields[ 'weight_table_weight_row_' . $i ] ) ) {
					$instance_form_fields = array_merge( $instance_form_fields, array(
						'weight_table_weight_row_' . $i => array( // mislabeled, should be 'table_weight_row_'
							'title'       => __( 'Max Weight or Quantity', 'woocommerce' ) . ' #' . $i,
							'type'        => 'number',
							'default'     => 0,
							'desc_tip'    => true,
							'custom_attributes' => array( 'step' => '0.000001', 'min'  => '0' ),
						),
						'weight_table_cost_row_' . $i => array(   // mislabeled, should be 'table_cost_row_'
							'title'       => __( 'Cost', 'woocommerce' ) . ' #' . $i,
							'type'        => 'text',
							'default'     => 0,
							'desc_tip'    => true,
//							'custom_attributes' => array( 'step' => '0.000001', 'min'  => '0' ),
						),
					) );
				}
			}
		}
		return $instance_form_fields;
	}

	/**
	 * Is this method available?
	 *
	 * @version 2.5.7
	 * @since   2.5.7
	 * @param   array $package
	 * @return  bool
	 */
	function is_available( $package ) {
		$available = parent::is_available( $package );
		if ( $available ) {
			$total_weight = WC()->cart->get_cart_contents_weight();
			if ( 0 != $this->min_weight && $total_weight < $this->min_weight ) {
				$available = false;
			} elseif ( 0 != $this->max_weight && $total_weight > $this->max_weight ) {
				$available = false;
			}
		}
		return $available;
	}

	/**
	 * Initialise Settings Form Fields
	 *
	 * @version 3.4.0
	 * @since   2.5.6
	 */
	function init_instance_form_fields() {
		$type_options = array(
			'flat_rate'                    => __( 'Flat rate', 'woocommerce-jetpack' ),
			'by_total_cart_weight'         => __( 'By total cart weight', 'woocommerce-jetpack' ),
			'by_total_cart_weight_table'   => __( 'By total cart weight table', 'woocommerce-jetpack' ),
			'by_total_cart_quantity'       => __( 'By total cart quantity', 'woocommerce-jetpack' ),
		);
		$type_options = apply_filters( 'booster_option', $type_options, array_merge( $type_options, array(
			'by_total_cart_quantity_table' => __( 'By total cart quantity table', 'woocommerce-jetpack' ),
		) ) );
		$this->instance_form_fields = array(
			'title' => array(
				'title'       => __( 'Title', 'woocommerce' ),
				'type'        => 'text',
				'description' => __( 'This controls the title which the user sees during checkout.', 'woocommerce' ),
				'default'     => __( 'Custom Shipping', 'woocommerce-jetpack' ),
				'desc_tip'    => true,
			),
			'type' => array(
				'title'       => __( 'Type', 'woocommerce' ),
				'type'        => 'select',
				'description' => __( 'Cost calculation type.', 'woocommerce-jetpack' ) . ' ' .
					apply_filters( 'booster_message', '', 'desc_advanced_no_link', array( 'option' => __( 'By Total Cart Quantity Table', 'woocommerce-jetpack' ) ) ),
				'default'     => 'flat_rate',
				'desc_tip'    => true,
				'options'     => $type_options,
			),
			'cost' => array(
				'title'       => __( 'Cost', 'woocommerce' ),
				'type'        => 'text',
				'description' => __( 'Cost. If calculating by weight - then cost per one weight unit. If calculating by quantity - then cost per one piece.', 'woocommerce-jetpack' ),
				'default'     => 0,
				'desc_tip'    => true,
//				'custom_attributes' => array( 'step' => '0.000001', 'min'  => '0' ),
			),
			'min_weight' => array(
				'title'       => __( 'Min Weight', 'woocommerce' ),
				'type'        => 'number',
				'description' => __( 'Minimum total cart weight. Set zero to disable.', 'woocommerce-jetpack' ),
				'default'     => 0,
				'desc_tip'    => true,
				'custom_attributes' => array( 'step' => '0.000001', 'min'  => '0' ),
			),
			'max_weight' => array(
				'title'       => __( 'Max Weight', 'woocommerce' ),
				'type'        => 'number',
				'description' => __( 'Maximum total cart weight. Set zero to disable.', 'woocommerce-jetpack' ),
				'default'     => 0,
				'desc_tip'    => true,
				'custom_attributes' => array( 'step' => '0.000001', 'min'  => '0' ),
			),
			'apply_formula' => array(
				'title'       => __( 'Apply Formula to Costs', 'woocommerce' ),
				'description' => sprintf( __( 'You can use %s and %s params in formula. E.g.: %s', 'woocommerce-jetpack' ),
						'<em>weight</em>', '<em>quantity</em>', '<em>2.5+weight</em>' ) . '<br>' .
					apply_filters( 'booster_message', '', 'desc_no_link' ),
				'desc_tip'    => true,
				'type'        => 'checkbox',
				'default'     => 'no',
				'custom_attributes' => apply_filters( 'booster_message', '', 'disabled' ),
			),
			'weight_table_total_rows' => array( // mislabeled, should be 'table_total_rows'
				'title'       => __( 'Table Total Rows', 'woocommerce' ),
				'type'        => 'number',
				'description' => __( 'Press "Save changes" and reload the page after you change this number.', 'woocommerce-jetpack' ),
				'default'     => 0,
				'desc_tip'    => true,
				'custom_attributes' => array( 'min'  => '0' ),
			),
		);
		/* for ( $i = 1; $i <= $this->get_option( 'weight_table_total_rows' ); $i++ ) {
			$this->instance_form_fields = array_merge( $this->instance_form_fields, array(
				'weight_table_weight_row_' . $i => array(
					'title'       => __( 'Max Weight', 'woocommerce' ) . ' #' . $i,
					'type'        => 'number',
					'default'     => 0,
					'desc_tip'    => true,
					'custom_attributes' => array( 'step' => '0.000001', 'min'  => '0' ),
				),
				'weight_table_cost_row_' . $i => array(
					'title'       => __( 'Cost', 'woocommerce' ) . ' #' . $i,
					'type'        => 'number',
					'default'     => 0,
					'desc_tip'    => true,
					'custom_attributes' => array( 'step' => '0.000001', 'min'  => '0' ),
				),
			) );
		} */
	}

	/**
	 * calculate_shipping_by_table.
	 *
	 * @version 2.8.0
	 * @since   2.5.6
	 */
	function calculate_shipping_by_table( $weight ) {
		if ( 0 == $this->weight_table_total_rows ) {
			return $this->cost * $weight; // fallback
		}
		$option_name_weight = $option_name_cost = '';
		for ( $i = 1; $i <= $this->weight_table_total_rows; $i++ ) {
			$option_name_weight = 'weight_table_weight_row_' . $i;
			$option_name_cost = 'weight_table_cost_row_' . $i;
			if ( $weight <= $this->get_option( $option_name_weight ) ) {
				return $this->get_option( $option_name_cost );
			}
		}
		return $this->get_option( $option_name_cost ); // fallback - last row
	}

	/**
	 * maybe_apply_formula.
	 *
	 * @version 3.4.0
	 * @since   3.4.0
	 * @todo    use WC math library instead of `PHPMathParser`
	 */
	function maybe_apply_formula( $formula ) {
		if ( 'yes' !== $this->apply_formula ) {
			return $formula;
		}
		require_once( wcj_plugin_path() . '/includes/lib/PHPMathParser/Math.php' );
		$math = new WCJ_Math();
		$variables = array(
			'quantity' => $this->get_total_cart_quantity(),
			'weight'   => WC()->cart->get_cart_contents_weight(),
		);
		foreach ( $variables as $key => $value ) {
			$math->registerVariable( $key, $value );
			$formula = str_replace( $key, '$' . $key, $formula );
		}
		try {
			return $math->evaluate( $formula );
		} catch ( Exception $e ) {
			return $formula;
		}
	}

	/**
	 * get_total_cart_quantity.
	 *
	 * @version 2.8.0
	 * @since   2.8.0
	 */
	function get_total_cart_quantity() {
		$cart_quantity = 0;
		foreach ( WC()->cart->get_cart() as $cart_item_key => $values ) {
			$cart_quantity += $values['quantity'];
		}
		return $cart_quantity;
	}

	/**
	 * calculate_shipping function.
	 *
	 * @version 3.4.0
	 * @since   2.5.6
	 * @access  public
	 * @param   mixed $package
	 * @return  void
	 */
	function calculate_shipping( $package = array() ) {
		switch ( $this->type ) {
			case 'by_total_cart_quantity':
				$cost = $this->cost * $this->get_total_cart_quantity();
				break;
			case 'by_total_cart_weight':
				$cost = $this->cost * WC()->cart->get_cart_contents_weight();
				break;
			case 'by_total_cart_quantity_table':
				$cost = $this->calculate_shipping_by_table( $this->get_total_cart_quantity() );
				break;
			case 'by_total_cart_weight_table':
				$cost = $this->calculate_shipping_by_table( WC()->cart->get_cart_contents_weight() );
				break;
			default: // 'flat_rate'
				$cost = $this->cost;
				break;
		}
		$rate = array(
			'id'       => $this->get_rate_id(),
			'label'    => $this->title,
			'cost'     => $this->maybe_apply_formula( $cost ),
			'calc_tax' => 'per_order',
		);
		// Register the rate
		$this->add_rate( $rate );
	}
}

endif;