<?php

namespace KommaApp\Stats;

/**
 * This class bundles al the statistics methods
 *
 * @author      Tim Van Samang <timvansamang@komma.pro>
 * @copyright   (c) 2012-2015, Komma Mediadesign
 */

use KommaApp\Stats\Models\DetailPageStats;
use KommaApp\Stats\Models\SearchStats;


/**
 * Class StatsService
 * @package KommaApp\Stats
 */
class StatsService
{
    /**
     * When a customer searches for a company.
     * We save the search_term and the result.
     *
     * @param $search_term
     * @param $result
     * @param $customer
     */
    public function saveSearchStats($search_term, $result, $customer)
    {

        //If there is no account, return (normally not possible)
        if (!$customer) return;

        SearchStats::create([
                'customer_id' => $customer->id,
                'customer_country_id' => $customer->country,
                'search_term' => $search_term,
                'result_count' => $result->count(),
                'result_ids' => json_encode($result->modelKeys())
            ]
        );
    }

    /**
     * When a customer opens an company detail page
     * We save the company id and the customer
     *
     * @param $debtor
     * @param $customer
     * @param $searchTerm
     */
    public function saveDetailPageStats($debtor, $customer, $searchTerm)
    {
        //If there is no account, return (normally not possible)
        if (!$customer) return;

        DetailPageStats::create([
                'customer_id' => $customer->id,
                'customer_country_id' => $customer->country,
                'search_term' => $searchTerm,
                'debtor_id' => $debtor->id,
            ]
        );
    }

    /**
     * Get the search terms for a specific customer.
     * This is a wrapper for getSearchTermsBy()
     * @param $customerId
     * @return mixed
     */
    public function getSearchTermsByCustomerId($customerId)
    {
        $searchStats = $this->getSearchTermsBy('customer_id', $customerId);
        return $searchStats;
    }

    /**
     * Get the search terms for a specific
     * field value combination.
     *
     * @param $field
     * @param $value
     * @param string $operator
     * @return mixed
     */
    public function getSearchTermsBy($field, $value, $operator = '=')
    {
        $searchStats = SearchStats::where($field, $operator, $value)
            //By default orderBy created
            ->orderBy('created_at', 'desc')
            ->get();
        return $searchStats;
    }


    /**
     * This is a wrapper for getDetailPagesBy
     * and gets the visited detail pages
     * for a specific customer
     *
     * @param $customerId
     * @return mixed
     */
    public function getDetailPageByCustomerId($customerId)
    {
        $detailPageStats = DetailPageStats::where('customer_id', '=', $customerId)
            ->orderBy('created_at', 'desc')
            ->get();
        return $detailPageStats;
    }

    /**
     * Get the detail page stats for a specific
     * field value combination.
     *
     * @param $field
     * @param $value
     * @param string $operator
     * @return mixed
     */
    public function getDetailPageBy($field, $value, $operator = '=')
    {
        $detailPageStats = DetailPageStats::where($field, $operator, $value)
            ->orderBy('created_at', 'desc')
            ->get();
        return $detailPageStats;
    }


    /**
     * Get the search term statistics
     *
     * @param null $maxResult
     * @return array
     */
    public function getSearchTermsStats($maxResult = null)
    {
        //Select, the search term and a jound iso_2 from the country
        $searchStats = SearchStats::select('search_stats.search_term as search_term', 'countries.iso_2 as iso')
            ->leftJoin('countries', 'countries.id', '=', 'search_stats.customer_country_id');
        //If $maxResult is set, only results where page searches have less then the given results
        if ($maxResult !== null) {
            $searchStats = $searchStats->where('result_count', '<=', $maxResult);
        }

        //Get the stats
        $searchStats = $searchStats->get();

        //Sort by search_term and sort by the count of the items
        $global = $this->groupAndSortByCount($searchStats, 'search_term');

        //Countries
        //Group by the iso (country.iso_2)
        $country = $searchStats->groupBy('iso')
            //Transform the items
            ->transform(function ($items) {
                //Sort by search_term and sort by the count of the items
                return $this->groupAndSortByCount($items, 'search_term');
            })->sortBy('iso');

        return [
            'global' => $global,
            'country' => $country
        ];

    }


    /**
     * Get the detail page statistics
     *
     * @return array
     */
    public function getDetailPageStats()
    {
        //Select the debtor_id, and the countries.iso_2 aa iao
        $detailPageStats = DetailPageStats::select('debtor_id', 'countries.iso_2 as iso')
            ->leftJoin('countries', 'countries.id', '=', 'detail_page_stats.customer_country_id')
            //include the debtor
            ->with('debtor');

        //Get the stats
        $detailPageStats = $detailPageStats->get();

        //Sort by detail_page and sort by the count of the items
        $global = $this->groupAndSortByCount($detailPageStats, 'debtor_id');

        //Countries
        //Group by the iso (country.iso_2)
        $country = $detailPageStats->groupBy('iso')
            //Transform the items
            ->transform(function ($element) {
                //Sort by detail_page and sort by the count of the items
                return $this->groupAndSortByCount($element, 'debtor_id');
            })->sortBy('iso');

        return [
            'global' => $global,
            'country' => $country
        ];
    }

    public function groupAndSortByCount($collection, $group_key)
    {

        //Group by group_key
        $collection = $collection->groupBy($group_key)
            //Sort by the count
            ->sortBy(function ($items) {
                return $items->count();
            })
            //Reverse highest first
            ->reverse();
        return $collection;
    }

}