<?php

class SaleStats
{
    public $sale;
    public $category;
    public $data_stats = array();
    public $data_subcategories = array();

    public $lang = array(
        'name' => 'Nom de la vente',
        'date_start' => 'Date de début',
        'date_end' => 'Date de fin',
        'duration' => 'Nb jours',
        'nb_ref' => 'Nb de réf.',
        'nb_quantity_start' => 'Quantité mise en vente',
        'nb_order_multi' => 'Nb commandes Multi',
        'nb_order_simple' => 'Nb commandes Simples',
        'nb_order_total' => 'Nb commandes Total',
        'taux_multi' => 'Taux de  multi',
        'quantity_sale' => 'Quantités vendues',
        'percent_sale' => '% d\'écoulement du stock',
        'percent_out_of_stock' => '% produits épuisés ("Hors stock")',
        'ca_ttc' => 'CA TTC produit',
        'marge' => 'Taux de marge',
        'total_bdc_ht' => 'BDC HT',
        
        'bestsale_1_product' => 'Meilleure vente 1',
        'bestsale_1_quantity' => 'Quantité',
        'bestsale_1_ca' => 'Montant HT',
        
        'bestsale_2_product' => 'Meilleure vente 2',
        'bestsale_2_quantity' => 'Quantité',
        'bestsale_2_ca' => 'Montant HT',

        'bestsale_3_product' => 'Meilleure vente 3',
        'bestsale_3_quantity' => 'Quantité',
        'bestsale_3_ca' => 'Montant HT',

        'cat_name' => 'Titre de la catégorie',
        'total_ref' => 'Nb ID',
        'total_quantity' => 'Quantité vendue',
        'total_amount_wholesale_price' => 'Total prix achat HT',
    );

    public function __construct(Sale $sale, Category $category, $id_lang = 2) 
    {
        $this->sale = $sale;
        $this->category = $category;        
        $this->id_lang = $id_lang;
    }

    public function loadData()
    {
        $this->addToStats('name', $this->category->name);

        $this->addToStats('date_start', date('d-m-Y', strtotime($this->sale->date_start)) );
        $this->addToStats('date_end', date('d-m-Y', strtotime($this->sale->date_end)) );
        $diff = abs(strtotime($this->sale->date_start) - strtotime($this->sale->date_end));
        $this->addToStats('duration', ceil($diff / (60 * 60 * 24)) );        

        $this->addToStats('nb_ref', $this->getNbRef());

        $stat_info = $this->loadStatFromSale();
        $this->addToStats('nb_quantity_start', $stat_info['init_stock']);
        $this->addToStats('nb_order_multi', $stat_info['total_multi']);
        $this->addToStats('nb_order_simple', $stat_info['total_orders'] - $stat_info['total_multi']);
        
        $this->addToStats('nb_order_total', $stat_info['total_orders']);
        $this->addToStats('taux_multi', number_format(($stat_info['total_multi'] / $stat_info['total_orders'] * 100),2).'%' );
        $this->addToStats('quantity_sale', $stat_info['total_products']);
        $this->addToStats('percent_sale', number_format(($stat_info['total_products'] / $stat_info['init_stock'] * 100),2).'%');
        $this->addToStats('percent_out_of_stock', number_format($stat_info['oos'], 2) . '%');
        $this->addToStats('ca_ttc', (int) $stat_info['total_sales_wt']);
        $this->addToStats('marge', number_format(($stat_info['margin_rate'] * 100),2).'%');
    }


    public function addToStats($key, $data) 
    {
        $this->data_stats[$key] = $data;
    }


    public function loadDataForSubCategory()
    {
        if (!Validate::isLoadedObject($this->category)) {
            return false;
        }
        $childrens = Category::getChildren($this->category->id, $this->id_lang, false);
        if ($childrens) {
            foreach ($childrens as $key => $child) {
                $total_ref = self::getTotalRefByCategory($child['id_category']);
                $quantity_sale = self::getTotalQuantityByCategory($child['id_category']);
                $total_ca =  self::getTotalWholesalePrice($child['id_category']);

                $this->data_subcategories[] = array(
                    'cat_name' => $child['name'],
                    'total_ref' => (int) $total_ref,
                    'total_quantity' => (int) $quantity_sale,
                    'total_amount_wholesale_price' => $total_ca,
                );
            }
        }

        $this->reOrderSubCategory();
    }

    public function reOrderSubCategory() 
    {
        if ($this->data_subcategories) {
            $size = count($this->data_subcategories);
            for ($i=0; $i < $size; $i++) { 
                for ($j=$size-1; $j >= $i ; $j--) { 
                    if ($this->data_subcategories[$j+1]['total_amount_wholesale_price']
                         > $this->data_subcategories[$j]['total_amount_wholesale_price']) {
                        $temp = $this->data_subcategories[$j+1];
                        $this->data_subcategories[$j+1] = $this->data_subcategories[$j];
                        $this->data_subcategories[$j] = $temp;
                    }
                }
            }
        }
    }

    public static function getTotalWholesalePrice($id_category)
    {
        $total = 0;
        $details = Db::getInstance()->executeS('
            SELECT * 
            FROM `ps_order_detail` od
            LEFT JOIN `ps_orders` o ON o.`id_order` = od.`id_order`
            WHERE od.`product_id` IN (
                SELECT `id_product` FROM `'._DB_PREFIX_.'category_product` WHERE `id_category` = '.(int) $id_category.' 
            )
            AND o.`valid` = 1
        ');

        $wholesale_price = self::getWholesalePriceByCategory($id_category);
        foreach ($details as $key => $detail) {
            $wholesale_price_product = $wholesale_price[(int) $detail['product_id']]['wholesale_price'];
            $wholesale_price_product_attribute = $wholesale_price[(int) $detail['product_id']]['product_attribute'][$detail['product_attribute_id']];

            if ($detail['product_attribute_id'] != 0 
                && $wholesale_price_product_attribute != 0) {
                $total += $wholesale_price_product_attribute * ($detail['product_quantity'] - $detail['product_quantity_reinjected']);
            } else {
                $total += $wholesale_price_product * ($detail['product_quantity'] - $detail['product_quantity_reinjected']);
            }
        }

        return (float) $total;
    }

    public static function getWholesalePriceByCategory($id_category) 
    {
        $wholesale_price_product =  Db::getInstance()->ExecuteS('
            SELECT `wholesale_price`, p.`id_product`
            FROM `'._DB_PREFIX_.'product` p 
            LEFT JOIN `'._DB_PREFIX_.'order_detail` o ON o.`product_id` = p.`id_product`
            WHERE o.`product_id` IN (
                SELECT `id_product` FROM `'._DB_PREFIX_.'category_product` WHERE `id_category` = '.(int) $id_category.' 
            )'
        );
        $wholesale_price_product_attribute =  Db::getInstance()->ExecuteS('
            SELECT `wholesale_price`, pa.`id_product`, pa.`id_product_attribute`
            FROM `'._DB_PREFIX_.'product_attribute` pa
            LEFT JOIN `'._DB_PREFIX_.'order_detail` o ON o.`product_id` = pa.`id_product`
            WHERE o.`product_id` IN (
                SELECT `id_product` FROM `'._DB_PREFIX_.'category_product` WHERE `id_category` = '.(int) $id_category.' 
            )'
        );

        $prix_achat = array();
        foreach ($wholesale_price_product as $key => $price) {
            $prix_achat[$price['id_product']]['wholesale_price'] = $price['wholesale_price'];
            $prix_achat[$price['id_product']]['product_attribute'] = array();
        }

        if ($wholesale_price_product_attribute) {
            foreach ($wholesale_price_product_attribute as $key => $price) {
                $prix_achat[$price['id_product']]['product_attribute'][(int) $price['id_product_attribute']] = $price['wholesale_price'];
            }
        }
        return $prix_achat;
    }

    public static function getTotalQuantityByCategory($id_category)
    {
        return (int) Db::getInstance()->getValue('
            SELECT sum(od.`product_quantity` - od.`product_quantity_refunded` ) as total_sale
            FROM `'._DB_PREFIX_.'order_detail` od
            WHERE od.`product_id` IN (
                SELECT `id_product` FROM `'._DB_PREFIX_.'category_product` WHERE `id_category` = '.(int) $id_category.' 
            )'
        );
    }

    public static function getTotalRefByCategory($id_category)
    {
        return (int) Db::getInstance()->getValue('
            SELECT COUNT(DISTINCT(`id_product`)) as total_ref
            FROM `'._DB_PREFIX_.'category_product` 
            WHERE id_category = '.(int) $id_category.' 
        ');
    }

    public function export() 
    {
        $filename = 'Stats vente '. $this->sale->title[2].'.csv';
        header('Content-Type: application/force-download; charset=UTF-8');
        header('Content-disposition: attachment; filename="'.$filename.'"');
        $fp = fopen("php://output", 'w+');        

        foreach ($this->data_stats as $key => $stat) {
            $text = $this->lang[$key] . ';' . $stat ."\r\n";
            fwrite($fp, $text);
        }
        foreach ($this->data_subcategories as $key => $subcategories) {
            fwrite($fp, 'Sous categorie '. ($key+1)."\r\n");
            
            foreach ($subcategories as $key_2 => $subcategory) {
                $text = $this->lang[$key_2] . ';' . $subcategory ."\r\n";
                fwrite($fp, $text); 
            }
        }
        fclose($fp);
        die;
    }

    public function getNbRef()
    {
        return (int) Db::getInstance()->getValue('
            SELECT COUNT(DISTINCT(p.`reference`)) as nb_ref 
            FROM `'._DB_PREFIX_.'product` p 
            LEFT JOIN `'._DB_PREFIX_.'product_ps_cache` pc ON (pc.`id_product` = p.`id_product`) 
            WHERE pc.`id_sale` = '.(int) $this->sale->id.'
        ');
    }

    public function loadStatFromSale() 
    {
        return Db::getInstance()->getRow('
            SELECT * 
            FROM `'._DB_PREFIX_.'privatesale_livestats_sale` 
            WHERE `id_sale` ='.(int)$this->sale->id
        );
    }

}