<?php

namespace App\Http\Controllers\Bo;

use App\Http\Controllers\Controller;
use App\Models\InstantWin;
use App\Models\Prize;
use App\Models\Settings;

class InstantWinController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Contracts\View\View
     */
    public function index(): \Illuminate\Contracts\View\View
    {
        $nbInstantWin = InstantWin::count();
        $canGenerate  = 0;

        if (intval($nbInstantWin) > 0) {
            $canGenerate = 0;
        } else {
            $nbLots = Prize::count();
            if (intval($nbLots) > 0) {
                $canGenerate = 1;
            } else {
                $canGenerate = 0;
            }
        }

        $instantWin = InstantWin::orderBy('appear_date')->get();

        return view('back::pages.instant-win.index', [
            'can_generate' => $canGenerate,
            'instant_win' => $instantWin
        ]);
    }

    /**
     * Returns generated instant win.
     *
     * @return string|false
     */
    public function instantWinGenerate()
    {
        /** @var \App\Models\Settings */
        $settings   = app(Settings::class);
        $start_date = $settings->start_date;
        $end_date   = $settings->end_date;
        $lots       = Prize::all();

        $begin      = new \DateTime($start_date);
        $end        = new \DateTime($end_date);
        $interval   = new \DateInterval('P1D');
        $daterange  = new \DatePeriod($begin, $interval, $end);
        $dateGlobal = [];
        $lotsGlobal = [];

        foreach ($lots as $k => $lot) {
            for ($i = 0; $i < $lot->quantity; $i++) {
                $lotsGlobal[] = [
                    'id' => $lot->id,
                    'name' => $lot->label_one,
                    'hour' => str_pad(mt_rand(6, 22), 2, "0", STR_PAD_LEFT)
                        . ":" . str_pad(mt_rand(0, 59), 2, "0", STR_PAD_LEFT) . ":00"
                ];
            }
        }
        shuffle($lotsGlobal);
        foreach ($daterange as $date) {
            array_push($dateGlobal, ['date' => $date->format("Y-m-d"), 'lots' => []]);
        }

        $res = $this->generate($lotsGlobal, $dateGlobal, 0);

        foreach ($res as $date) {
            foreach ($date['lots'] as $lot) {
                $iw              = new InstantWin();
                $iw->prize_id    = $lot['id'];
                $iw->appear_date = date('Y-m-d H:i:s', strtotime($date['date'] . " " . $lot['hour']));
                $iw->save();
            }
        }

        $instantWins = InstantWin::all();
        return json_encode($instantWins);
    }

    /**
     * Generate instant win.
     *
     * @param array   $lotsGlobal
     * @param array   $dateGlobal
     * @param integer $lotsDone
     * @return array
     */
    private function generate(array $lotsGlobal, array $dateGlobal, int $lotsDone): array
    {
        $rKey = array_rand($dateGlobal, 1);
        if ($lotsDone < count($dateGlobal)) {
            if (count($dateGlobal[$rKey]['lots']) > 0) {
                return $this->generate($lotsGlobal, $dateGlobal, $lotsDone);
            }
        }
        array_push($dateGlobal[$rKey]['lots'], $lotsGlobal[$lotsDone++]);
        if ($lotsDone < count($lotsGlobal)) {
            return $this->generate($lotsGlobal, $dateGlobal, $lotsDone);
        }
        foreach ($dateGlobal as $k => $date) {
            usort($dateGlobal[$k]['lots'], [$this, 'sortFunction']);
        }
        return $dateGlobal;
    }

    /**
     * Callback to sort 2 items by their hour.
     *
     * @param array $a
     * @param array $b
     * @return integer|float
     */
    private function sortFunction(array $a, array $b): int|float
    {
        return strtotime($a["hour"]) - strtotime($b["hour"]);
    }
}