<?php

use App\ECommerce\Product\Entity as ProductEntity;

class Qs_Gtm
{
    const DATASET_IMPRESSION        = 'impression';
    const DATASET_CLICK             = 'click';
    const DATASET_DETAIL_IMPRESSION = 'detailImpression';
    const DATASET_CART              = 'cart';
    const DATASET_CHECKOUT          = 'checkout';

    protected static $_datasets = [
        self::DATASET_IMPRESSION        => ['id', 'name', 'price', 'brand', 'category', 'variant', 'list', 'position'],
        self::DATASET_CLICK             => ['id', 'name', 'price', 'brand', 'category', 'variant'],
        self::DATASET_DETAIL_IMPRESSION => ['id', 'name', 'price', 'brand', 'category', 'variant'],
        self::DATASET_CART              => ['id', 'name', 'price', 'brand', 'category', 'variant', 'quantity'],
        self::DATASET_CHECKOUT          => ['id', 'name', 'price', 'brand', 'category', 'variant', 'quantity'],
    ];

    protected static $_fieldsMap = [
        'id'       => ['productId', 'id'],
        'name'     => 'title',
        'price'    => 'price',
        'brand'    => '',
        'category' => 'productCategory',
        'variant'  => '',
        'quantity' => 'quantity',
        'list'     => 'list',
        'position' => 'position'
    ];

    protected static $_moneyFields = ['price'];

    protected static $_appendDescription = false;

    /**
     * @param string $description
     * @return string
     */
    protected static function _getDescription($description)
    {
        return ($description)  ? ' - ' . trim(strip_tags($description)) : '';
    }

    /**
     * @param array $data Product Data
     * @return string
     */
    protected static function _getTitle(array $data)
    {
        $title = $data['title'];
        if (self::$_appendDescription) {
            $title .= self::_getDescription($data['description']);
        }
        return $title;
    }


    /* AdWords Dynamic Remarketing */

    /**
     * AdWords Dynamic Remarketing Product View
     * @param array $data Product Data
     * @return array
     */
    public static function adGetProductView(array $data)
    {
        $values = [
            'ecomm_pagetype'   => 'product',
            'ecomm_prodid'     => $data['id'],
            'ecomm_prodname'   => $data['title'],
            'ecomm_totalvalue' => $data['price'],
        ];

        return [['google_tag_params' => $values]];
    }

    /**
     * AdWords Dynamic Remarketing Category Page
     * @param array $products Products List
     * @return array
     */
    public static function adGetCategoryPage(array $products)
    {
        $values = [
            'ecomm_pagetype' => 'category',
            'ecomm_prodid'   => [],
            'ecomm_prodname' => [],
        ];

        if ($products) {
            foreach ($products as $data) {
                $values['ecomm_prodid'][]   = $data['id'];
                $values['ecomm_prodname'][] = $data['title'];
            }
        }

        return [['google_tag_params' => $values]];
    }

    /**
     * AdWords Dynamic Remarketing Add to Shopping Cart
     * @param array $list
     * @return array
     */
    public static function adGetShoppingCart(array $list)
    {
        $values = [
            'ecomm_pagetype'   => 'cart',
            'ecomm_prodid'     => [],
            'ecomm_prodname'   => [],
            'ecomm_totalvalue' => null
        ];

        $total = '0.00';
        foreach ($list as $item) {
            if (ProductEntity::CART_ITEM_TYPE != $item['cartItemType']) {
                continue;
            }

            $values['ecomm_prodid'][] = $item['productId'];
            $values['ecomm_prodname'][] = self::_getTitle($item);

            $total = Zend_Locale_Math::Add($total, $item['rowTotal'], 2);
        }
        $values['ecomm_totalvalue'] = $total;

        return [['google_tag_params' => $values]];
    }

    /**
     * AdWords Dynamic Remarketing Purchase Confirmation
     * @param array $transaction Transaction Data
     * @param array $cart Cart Items
     * @return array
     */
    public static function adGetPurchase(array $transaction, array $cart)
    {
        $shippingCost = Zend_Locale_Math::Add($transaction['shippingRate'], $transaction['shippingHandling'], 2);

        $values = [
            'ecomm_pagetype'      => 'purchase',
            'ecomm_transactionid' => $transaction['id'],
            'ecomm_prodid'        => [],
            'ecomm_prodname'      => [],
            'ecomm_prodcategory'  => [],
            'ecomm_prodprice'     => [],
            'ecomm_prodqty'       => [],

            'ecomm_totalvalue'    => $transaction['total'],
            'ecomm_productsvalue' => null,
            'ecomm_tax'           => $transaction['tax'],
            'ecomm_shipping'      => $shippingCost
        ];

        $productsValue = '0.00';
        foreach ($cart as $item) {
            if (ProductEntity::CART_ITEM_TYPE != $item['cartItemType']) {
                continue;
            }
            $values['ecomm_prodid'][]       = $item['productId'];
            $values['ecomm_prodname'][]     = self::_getTitle($item);
            $values['ecomm_prodcategory'][] = $item['productCategory'];
            $values['ecomm_prodprice'][]    = number_format($item['price'], 2, '.', '');
            $values['ecomm_prodqty'][]      = $item['quantity'];

            $productsValue = Zend_Locale_Math::Add($productsValue, $item['rowTotal'], 2);
        }
        $values['ecomm_productsvalue'] = $productsValue;

        return [['google_tag_params' => $values]];
    }


    /* Google Analytics Ecommerce */

    /**
     * Google Analytics E-commerce
     * @param array $transaction Transaction Data
     * @param array $cart Cart Items
     * @return array
     */
    public static function gaGetECommerce(array $transaction, array $cart)
    {
        $shippingCost = Zend_Locale_Math::Add($transaction['shippingRate'], $transaction['shippingHandling'], 2);

        $values['transactionId'] = $transaction['id'];
        $values['transactionTotal'] = $transaction['total'];
        $values['transactionTax'] = $transaction['tax'];
        $values['transactionShipping'] = $shippingCost;
        $values['transactionProducts'] = [];

        foreach ($cart as $item) {
            if (ProductEntity::CART_ITEM_TYPE != $item['cartItemType']) {
                continue;
            }
            $values['transactionProducts'][] = [
                'sku'      => $item['productId'],
                'name'     => self::_getTitle($item),
                'category' => $item['productCategory'],
                'price'    =>  number_format($item['price'], 2, '.', ''),
                'quantity' => $item['quantity']
            ];
        }

        return [$values];
    }


    /* Enhanced Ecommerce */

    /**
     * @param string|array $field
     * @param array $data
     * @param array $additionalData
     * @return mixed
     */
    protected static function _getFieldValue($field, array $data, array $additionalData = [])
    {
        if (!is_array($field)) {
            $field = [$field];
        }

        $value = '';
        foreach ($field as $_field) {
            if (!($value = Qs_Array::get($data, $_field, ''))) {
                $value = Qs_Array::get($additionalData, $_field, '');
            }
            if ($value) {
                break;
            }
        }

        return $value;
    }

    /**
     * @param array $data Product Data
     * @param string $dataset Dataset Name
     * @param array $additionalData Products Additional Product Data
     * @return array|false
     */
    public static function eeGetProduct(array $data, $dataset, $additionalData = [])
    {
        if (array_key_exists('cartItemType', $data) && ProductEntity::CART_ITEM_TYPE != $data['cartItemType']) {
            return false;
        }

        if (self::DATASET_CART == $dataset) {
            $data['title'] = self::_getTitle($data);
        }

        $values = [];
        foreach (self::$_datasets[$dataset] as $field) {
            $value = '';
            $mapField = self::$_fieldsMap[$field];
            if ($mapField) {
                $value = self::_getFieldValue($mapField, $data, $additionalData);
            }

            if ($value) {
                if (in_array($field, self::$_moneyFields)) {
                    $value = Zend_Locale_Math::round($value, 2);
                }
            }

            $values[$field] = $value;
        }

        return array_filter($values);
    }

    /**
     * @param array $list Products List
     * @param string $dataset Dataset Name
     * @param array $additionalData Products Additional Product Data
     * @param bool $saveIndexes Save Indexes from $list
     * @return array
     */
    public static function eeGetProducts(array $list, $dataset, array $additionalData = [], $saveIndexes = false)
    {
        $products = [];

        foreach ($list as $index => $item) {
            $values = self::eeGetProduct($item, $dataset, $additionalData);
            if ($values) {
                if ($saveIndexes) {
                    $products[$index] = $values;
                } else {
                    $products[] = $values;
                }
            }
        }

        return $products;
    }

    /**
     * Enhanced Ecommerce, Measuring Product Impressions
     * @param array $products Products List
     * @param string $category Category Title
     * @param string $list List Title
     * @param int $startPosition Start Position in List Relative to Page Number
     * @return array
     */
    public static function eeGetProductImpressions(array $products, $category = null, $list = null, $startPosition = null)
    {
        $values = ['impressions' => []];

        if ($products) {
            $position = 1;
            $additionalData = [
                'productCategory' => $category,
                'list'            => $list,
            ];
            foreach ($products as $product) {
                $additionalData['position'] = ($position++) + $startPosition;
                $value = self::eeGetProduct($product, self::DATASET_IMPRESSION, $additionalData);
                $values['impressions'][] = $value;
            }
        }

        return [['ecommerce' => $values]];
    }

    /**
     * Enhanced Ecommerce, Measuring Views of Product Details
     * @param array $data Product Data
     * @return array
     */
    public static function eeGetProductDetailImpressions(array $data)
    {
        $values = [
            'detail' => [
                'products' => [self::eeGetProduct($data, self::DATASET_DETAIL_IMPRESSION)]
            ]
        ];

        return [['ecommerce' => $values]];
    }

    /**
     * Enhanced Ecommerce, Measuring Purchases
     * @param array $transaction Transaction Data
     * @param array $cart Cart Items
     * @return array
     */
    public static function eeGetMeasuringPurchases(array $transaction, array $cart)
    {
        $values = [
            'purchase' => [
                'actionField' => [
                    'id'          => $transaction['id'],
                    'affiliation' => 'Online Store',
                    'revenue'     => $transaction['total'],
                    'tax'         => $transaction['tax'],
                    'shipping'    => Zend_Locale_Math::Add($transaction['shippingRate'], $transaction['shippingHandling'], 2),
                    //'coupon'      => ''
                ],
                'products' => self::eeGetProducts($cart, self::DATASET_CART)
            ]
        ];

        return [['ecommerce' => $values]];
    }
}