<?php

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

function x_pixel_wpsc_currency() {
	return function_exists( 'wpsc_get_currency_code' ) ? (string) wpsc_get_currency_code() : '';
}

function x_pixel_wpsc_content( $product_id, $name, $price, $quantity ) {
	$product_id = (int) $product_id;
	if ( $product_id <= 0 ) {
		return array();
	}
	$parent_id = (int) get_post_field( 'post_parent', $product_id );
	return array( x_pixel_content_item( $product_id, $name, $price, $quantity, $parent_id ? $parent_id : $product_id ) );
}

function x_pixel_wpsc_pending_add_to_cart( $event = false ) {
	static $pending = null;
	if ( $event !== false ) {
		$pending = $event;
	}
	return $pending;
}

function x_pixel_wpsc_on_product_view() {
	if ( ! is_singular( 'wpsc-product' ) || ! function_exists( 'wpsc_calculate_price' ) ) {
		return;
	}
	$event_id = get_option( X_PIXEL_OPTION_EVENT_VIEW, '' );
	if ( $event_id === '' ) {
		return;
	}
	$product_id = get_queried_object_id();
	if ( ! $product_id ) {
		return;
	}
	$price  = (float) wpsc_calculate_price( $product_id );
	$params = array(
		'value'    => $price,
		'currency' => x_pixel_wpsc_currency(),
		'contents' => x_pixel_wpsc_content( $product_id, get_the_title( $product_id ), $price, 1 ),
	);
	$code   = x_pixel_event_code( x_pixel_get_id(), $event_id );
	if ( $code === '' ) {
		return;
	}
	x_pixel_print_event_script( $code, $params );
}

function x_pixel_wpsc_on_add_to_cart( $product, $cart_item ) {
	$event_id = get_option( X_PIXEL_OPTION_EVENT_ATC, '' );
	if ( $event_id === '' || ! is_object( $cart_item ) || empty( $cart_item->product_id ) ) {
		return;
	}
	$qty           = isset( $cart_item->quantity ) ? max( 1, (int) $cart_item->quantity ) : 1;
	$price         = isset( $cart_item->unit_price ) ? (float) $cart_item->unit_price : null;
	$name          = isset( $cart_item->product_name ) ? $cart_item->product_name : get_the_title( $cart_item->product_id );
	$conversion_id = 'atc-' . wp_generate_uuid4();
	$params        = array(
		'value'         => (float) $price * $qty,
		'currency'      => x_pixel_wpsc_currency(),
		'num_items'     => $qty,
		'contents'      => x_pixel_wpsc_content( $cart_item->product_id, $name, $price, $qty ),
		'conversion_id' => $conversion_id,
	);
	x_pixel_wpsc_pending_add_to_cart(
		array(
			'event_id' => $event_id,
			'params'   => $params,
		)
	);
	x_pixel_send_capi(
		$event_id,
		$params,
		x_pixel_request_identifiers(),
		$conversion_id,
		x_pixel_event_source_url()
	);
}

function x_pixel_wpsc_add_to_cart_response( $response ) {
	$pending = x_pixel_wpsc_pending_add_to_cart();
	if ( ! is_array( $response ) || ! is_array( $pending ) ) {
		return $response;
	}
	$code = x_pixel_event_code( x_pixel_get_id(), $pending['event_id'] );
	if ( $code === '' ) {
		return $response;
	}
	ob_start();
	x_pixel_print_event_script( $code, $pending['params'] );
	$script                    = ob_get_clean();
	$widget                    = isset( $response['widget_output'] ) && is_string( $response['widget_output'] ) ? $response['widget_output'] : '';
	$response['widget_output'] = $widget . $script;
	return $response;
}

function x_pixel_wpsc_on_checkout() {
	if ( ! function_exists( 'wpsc_is_checkout' ) || ! wpsc_is_checkout() ) {
		return;
	}
	$event_id = get_option( X_PIXEL_OPTION_EVENT_CHECKOUT, '' );
	if ( $event_id === '' ) {
		return;
	}
	global $wpsc_cart;
	if ( ! is_object( $wpsc_cart ) || empty( $wpsc_cart->cart_items ) || ! is_array( $wpsc_cart->cart_items ) ) {
		return;
	}
	$contents = array();
	$qty      = 0;
	$lines    = array();
	foreach ( $wpsc_cart->cart_items as $item ) {
		if ( ! is_object( $item ) || empty( $item->product_id ) ) {
			continue;
		}
		$item_qty = isset( $item->quantity ) ? max( 1, (int) $item->quantity ) : 1;
		$price    = isset( $item->unit_price ) ? (float) $item->unit_price : null;
		$name     = isset( $item->product_name ) ? $item->product_name : get_the_title( $item->product_id );
		$qty     += $item_qty;
		$contents = array_merge( $contents, x_pixel_wpsc_content( $item->product_id, $name, $price, $item_qty ) );
		$lines[]  = array( (string) $item->product_id, $item_qty, $price );
	}
	if ( $contents === array() ) {
		return;
	}
	$cart_hash     = md5( wp_json_encode( $lines ) );
	$conversion_id = x_pixel_conversion_id( 'checkout-' . $cart_hash );
	$total         = method_exists( $wpsc_cart, 'calculate_total_price' ) ? $wpsc_cart->calculate_total_price() : 0;
	$params        = array(
		'value'         => (float) $total,
		'currency'      => x_pixel_wpsc_currency(),
		'num_items'     => $qty,
		'contents'      => $contents,
		'conversion_id' => $conversion_id,
	);
	$code          = x_pixel_event_code( x_pixel_get_id(), $event_id );
	if ( $code === '' ) {
		return;
	}
	x_pixel_print_event_script( $code, $params );

	if ( ! function_exists( 'wpsc_get_customer_meta' ) || ! function_exists( 'wpsc_update_customer_meta' ) ) {
		return;
	}
	if ( wpsc_get_customer_meta( 'x_pixel_checkout_capi_hash' ) === $cart_hash ) {
		return;
	}
	$sent = x_pixel_send_capi(
		$event_id,
		$params,
		x_pixel_request_identifiers(),
		$conversion_id,
		x_pixel_current_url()
	);
	if ( $sent ) {
		wpsc_update_customer_meta( 'x_pixel_checkout_capi_hash', $cart_hash );
	}
}

function x_pixel_wpsc_on_transaction_results( $purchase_log, $session_id, $display_to_screen ) {
	if ( ! $display_to_screen || ! is_object( $purchase_log ) || ! method_exists( $purchase_log, 'is_transaction_completed' ) ) {
		return;
	}
	$event_id = get_option( X_PIXEL_OPTION_EVENT_PURCHASE, '' );
	if ( $event_id === '' || ! $purchase_log->is_transaction_completed() ) {
		return;
	}
	$log_id = (int) $purchase_log->get( 'id' );
	if ( $log_id <= 0 || ! function_exists( 'wpsc_get_purchase_meta' ) || ! function_exists( 'wpsc_update_purchase_meta' ) ) {
		return;
	}

	$contents = array();
	$qty      = 0;
	$items    = $purchase_log->get_items();
	if ( ! is_array( $items ) ) {
		$items = array();
	}
	foreach ( $items as $item ) {
		if ( ! is_object( $item ) || empty( $item->prodid ) ) {
			continue;
		}
		$item_qty = isset( $item->quantity ) ? max( 1, (int) $item->quantity ) : 1;
		$price    = isset( $item->price ) ? (float) $item->price : null;
		$name     = isset( $item->name ) ? $item->name : get_the_title( $item->prodid );
		$qty     += $item_qty;
		$contents = array_merge( $contents, x_pixel_wpsc_content( $item->prodid, $name, $price, $item_qty ) );
	}
	$email         = function_exists( 'wpsc_get_buyers_email' ) ? (string) wpsc_get_buyers_email( $log_id ) : '';
	$conversion_id = x_pixel_conversion_id( 'wpsc-' . $log_id );
	$params        = array(
		'value'         => (float) $purchase_log->get( 'totalprice' ),
		'currency'      => x_pixel_wpsc_currency(),
		'num_items'     => $qty,
		'contents'      => $contents,
		'conversion_id' => $conversion_id,
		'description'   => sprintf( 'WP eCommerce purchase %d', $log_id ),
	) + x_pixel_matching_params( $email, '', '', '' );

	if ( wpsc_get_purchase_meta( $log_id, '_x_pixel_purchase_browser_sent', true ) !== '1' ) {
		$code = x_pixel_event_code( x_pixel_get_id(), $event_id );
		if ( $code !== '' ) {
			x_pixel_print_event_script( $code, $params );
			wpsc_update_purchase_meta( $log_id, '_x_pixel_purchase_browser_sent', '1' );
		}
	}

	if ( wpsc_get_purchase_meta( $log_id, '_x_pixel_purchase_sent', true ) === '1' ) {
		return;
	}
	$sent = x_pixel_send_capi(
		$event_id,
		$params,
		x_pixel_matching_identifiers( x_pixel_request_identifiers(), $params ),
		$conversion_id,
		x_pixel_current_url()
	);
	if ( $sent ) {
		wpsc_update_purchase_meta( $log_id, '_x_pixel_purchase_sent', '1' );
	}
}

function x_pixel_register_wpsc_hooks() {
	if ( ! class_exists( 'WP_eCommerce' ) && ! defined( 'WPSC_VERSION' ) ) {
		return;
	}
	add_action( 'wpsc_add_to_cart', 'x_pixel_wpsc_on_add_to_cart', 40, 2 );
	add_filter( 'wpsc_add_to_cart_json_response', 'x_pixel_wpsc_add_to_cart_response', 40 );
	add_action( 'wp_footer', 'x_pixel_wpsc_on_product_view', 15 );
	add_action( 'wp_footer', 'x_pixel_wpsc_on_checkout', 16 );
	add_action( 'wpsc_transaction_results_shutdown', 'x_pixel_wpsc_on_transaction_results', 40, 3 );
}
add_action( 'plugins_loaded', 'x_pixel_register_wpsc_hooks' );