<?php

namespace App\Http\Controllers\Bo;

use App\Http\Controllers\Controller;
use App\Mail\Won\DiscountWonMail;
use App\Mail\Won\PrizeWonMail;
use App\Models\Prize;
use App\Models\Settings;
use App\Models\Reduction;
use Illuminate\Contracts\View\View;
use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Illuminate\Mail\Mailables\Address;
use Illuminate\Support\Arr;

class Re7Controller extends Controller
{
    /**
     * Re7Controller
     *
     * @return void
     */
    public function __construct()
    {
        $this->middleware(function (Request $request, \Closure $next) {
            $this->authorize('fo.showRe7');
            return $next($request);
        });
    }

    /**
     * Show Teaser page
     *
     * @return \Illuminate\Contracts\View\View
     */
    public function teaser(): View
    {
        return view('theme::pages.teaser');
    }

    /**
     * Show Teaser page
     *
     * @return \Illuminate\Contracts\View\View
     */
    public function endGame(): View
    {
        return view('theme::pages.end-game');
    }

    // * -- Participation

    /**
     * Show prize page
     *
     * @param \App\Models\Prize $prize
     * @return \Illuminate\Contracts\View\View
     */
    public function prize(Prize $prize): View
    {
        return view('theme::pages.participation.won', [
            'prizeModel' => $prize
        ]);
    }

    /**
     * Show discount page
     *
     * @return \Illuminate\Contracts\View\View
     */
    public function discount(): View
    {
        /** @var \App\Models\Settings */
        $settings = app(Settings::class);
        /** @var \App\Lib\Discount */
        $discount = Arr::get(
            $settings->web_coupons,
            $this->getRandomWeightedElementIndex($settings->web_coupons)
        );

        $crmCoupon = new Reduction();
        return view('theme::pages.participation.won', compact('discount', 'crmCoupon'));
    }

    /**
     * Show loose page
     *
     * @return \Illuminate\Contracts\View\View
     */
    public function loose(): View
    {
        return view('theme::pages.participation.loose');
    }

    // * -- END Participation

    /**
     * View won discount mail
     *
     * @param \App\Models\Prize $prize
     * @return \Illuminate\Contracts\View\View
     */
    public function mailPrize(Prize $prize): View
    {
        return view('back::pages.re7-preview-mail', [
            'render_url' => route('re7.mail-print', [
                'type' => 'prize',
                'prize' => $prize
            ])
        ]);
    }

    /**
     * View won discount mail
     *
     * @return \Illuminate\Contracts\View\View
     */
    public function mailDiscount(): View
    {
        return view('back::pages.re7-preview-mail', [
            'render_url' => route('re7.mail-print', [
                'type' => 'discount'
            ])
        ]);
    }

    /**
     * Print a specific mail
     *
     * @param string                 $type
     * @param \App\Models\Prize|null $prize
     * @return \Illuminate\Http\Response
     */
    public function mailPrint(string $type, Prize|null $prize = null): Response
    {
        /** @var \App\Models\User */
        $user = auth('backend')->user();

        /** @var \App\Models\Settings */
        $settings = app(Settings::class);

        switch ($type) {
            case 'discount':
                /** @var \App\Lib\Discount */
                $discount = Arr::get(
                    $settings->web_coupons,
                    $this->getRandomWeightedElementIndex($settings->web_coupons)
                );

                return response((new DiscountWonMail(
                    new Address(
                        $user->email,
                        $user->first_name
                    ),
                    $settings->name,
                    $discount,
                    config('app.url')
                ))->render());
            case 'prize':
                return response((new PrizeWonMail(
                    new Address(
                        $user->email,
                        $user->first_name
                    ),
                    $settings->name,
                    $prize,
                    config('app.url')
                ))->render());
            default:
                return response('', 404);
        } //end switch
    }

    /**
     * Utility function for getting random values with weighting.
     * Pass in an associative array, such as array('A'=>5, 'B'=>45, 'C'=>50)
     * An array like this means that "A" has a 5% chance of being selected, "B" 45%, and "C" 50%.
     * The return value is the array key, A, B, or C in this case.  Note that the values assigned
     * do not have to be percentages.  The values are simply relative to each other.  If one value
     * weight was 2, and the other weight of 1, the value with the weight of 2 has about a 66%
     * chance of being selected.  Also note that weights should be integers.
     *
     * @param array<\App\Lib\Discount> $weightedValues
     * @return integer The winning key
     * @url https://stackoverflow.com/a/11872928/4355295
     */
    private function getRandomWeightedElementIndex(array $weightedValues): int
    {
        mt_srand(time());
        $rand = mt_rand(1, max((int)collect($weightedValues)->sum('percentage'), 1));

        foreach ($weightedValues as $key => $value) {
            $rand -= $value->percentage;
            if ($rand <= 0) {
                return $key;
            }
        }
    }
}