<?php

namespace App\Http\Controllers;

use App\Http\Requests;
use App\Paste;
use App\User;
use Carbon\Carbon;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Cookie;
use Illuminate\Support\Facades\Crypt;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Hash;
use Illuminate\Support\Facades\Input;
use Hashids\Hashids;

class PasteController extends Controller
{
    public function submit(Requests\StorePaste $request)
    {
        $title = (empty(trim(Input::get('pasteTitle')))) ? 'Untitled' : Input::get('pasteTitle');

        $expiration = Input::get('expire');
        $privacy = Input::get('privacy');

        // Memeriksa apakah user sudah memilih Privacy di dropdown list
        // $possibleValuesPrivacy = array("link", "password", "private");
        // if (in_array($privacy, $possibleValuesPrivacy) == false) return view('welcome');

        // Jika user memilih ingin dilindungi dengan password, kami memiliki pass-nya, jika tidak akan ditandai 'disabled'
        if ($privacy == 'password') $password = bcrypt(Input::get('pastePassword'));
        else $password = 'disabled';

        $burnAfter = 0;
        // Menghasilkan timestamp kedaluwarsa
        switch ($expiration) {
            case 'never':
                $timestampExp = 0;
                break;
            case 'burn':
                $timestampExp = date('Y-m-d H:i:s', time());
                $burnAfter = 1;
                break;
            case '10m':
                $timestampExp = date('Y-m-d H:i:s', time()+(60*10));
                break;
            case '1h':
                $timestampExp = date('Y-m-d H:i:s', time()+(60*60));
                break;
            case '1d':
                $timestampExp = date('Y-m-d H:i:s', time()+(60*60*24));
                break;
            case '1w':
                $timestampExp = date('Y-m-d H:i:s', time()+(60*60*24*7));
                break;
            default:
                die("User input error.");
                break;
        }

        // Pembuatan URL selama URL masih tersedia
        // $generatedLink = str_random(10);
        // $existingPasteWithGeneratedLink = Paste::where('link', $generatedLink)->first();
        // while (!is_null($existingPasteWithGeneratedLink)) {
        //     $generatedLink = str_random(10);
        //     $existingPasteWithGeneratedLink = Paste::where('link', $generatedLink)->first();
        // }

        // URL dibuat dari id paste, lalu digenerate ke dalam 16 (huruf kecil & angka)
        // https://github.com/ivanakimov/hashids.php
        $hashids = new Hashids('', 16, 'abcdefghijklmnopqrstuvwxyz123456789');
        $generatedLinkDB = Paste::orderBy('id', 'desc')->limit(1)->firstOrFail();
        $generatedLink = $hashids->encode($generatedLinkDB->id + 1);

        // https://github.com/vinkla/laravel-hashids
        // $generatedLinkRaw = Paste::orderBy('id', 'desc')->limit(1)->firstOrFail();
        // $generatedLink = Hashids::encode($generatedLinkRaw->id + 1);

        Paste::create([
            'link' => $generatedLink,
            'userId' => (Auth::check()) ? Auth::id() : 0,
            'views' => '0',
            'title' => $title,
            'content' => Crypt::encryptString(Input::get('pasteContent')),
            'ip' => $request->ip(),
            'expiration' => $timestampExp,
            'privacy' => $privacy,
            'password' => $password,
            'noSyntax' => Input::has('noSyntax'),
            'burnAfter' => $burnAfter,
        ]);

        return redirect('/'.$generatedLink);
    }


    public function view($link, Request $request)
    {
        $paste = Paste::where('link', $link)->firstOrFail();

        // Apakah user yang terhubung adalah orang yang membuat post paste?
        $isSameUser = ((Auth::user() == $paste->user && $paste->userId != 0)) ? true : false;

        // Paste kadaluarsa
        if ($paste->expiration != 0) {
            if ($paste->burnAfter == 0) {
                if (time() > strtotime($paste->expiration)){
                    if ($isSameUser) $expiration = "Expired";
                    else abort('404');
                }
                else $expiration = Carbon::parse($paste->expiration)->diffForHumans();
            }
            else {
                // Peringatan burn after reading
                if (time() - strtotime($paste->expiration) > 3) {
                    $disableBurn = true;
                    $expiration = "Burn after reading";
                }
                else $expiration = "Burn after reading (next time)";
            }
        }
        else {
            $expiration = "Never";
        }

        // Mengurus opsi privasi paste (TODO password)
        // https://stackoverflow.com/questions/30212390/laravel-middleware-return-variable-to-controller
        if ($paste->privacy == "private") {
            if ($isSameUser) $privacy = "Private";
            else abort('404');
        }
        elseif ($paste->privacy == "password") {
            $privacy = "Password-protected";
            if ($request->isMethod('post')) {
                if(!Hash::check(Input::get('pastePassword'), $paste->password)) return view('paste/password', ['link' => $paste->link, 'wrongPassword' => true]);
            }
            // Jika pengguna tidak sama dan paste dibuat lebih dari 3 detik yang lalu:
            elseif (!$isSameUser && time() - $paste->created_at->timestamp > 3) return view('paste/password', ['link' => $paste->link]);
        }
        elseif ($paste->privacy == "link") $privacy = "Public";
        else die("Error.");

        // Memeriksa apakah burnAfter harus dihapus (dilakukan setelah pemeriksaan password)
        if (isset($disableBurn)) {
            $paste->burnAfter = 0;
            $paste->save();
        }

        // Menambah angka view
        if (time()-$paste->updated_at->timestamp > 10) $paste->increment('views');

        // Return view
        return view('paste/view', [
            'username' => ($paste->userId != 0) ? $paste->user->username : "Guest",
            'views' => $paste->views,
            'sameUser' => $isSameUser,
            'link' => $link,
            'title' => $paste->title,
            'content' => Crypt::decryptString($paste->content),
            'expiration' => $expiration,
            'privacy' => $privacy,
            'date' => $paste->created_at->format('M jS, Y'),
            'fulldate' => $paste->created_at->format('d/m/Y - H:i:s'),
            'noSyntax' => $paste->noSyntax,
        ]);
    }

    public function password($link, Request $request)
    {
        $paste = Paste::where('link', $link)->firstOrFail();

        $messages = array(
            'pastePassword.required' => 'Please enter a password',
        );

        $this->validate($request, [
            'pastePassword' => 'required',
        ], $messages);

        if (Hash::check(Input::get('pastePassword'), $paste->password)) {
            Cookie::queue($paste->link, Input::get('pastePassword'), 15);
            return redirect('/'.$link);
        }
        else {
            return view('paste/password', ['link' => $paste->link, 'wrongPassword' => true]);
        }
    }

    public function raw($link)
    {
        header('Content-Type: text/plain');
        $paste = Paste::where('link', $link)->firstOrFail();

        // Apakah user yang terhubung adalah orang yang menulis paste?
        $isSameUser = ((Auth::user() == $paste->user && $paste->userId != 0)) ? true : false;

        if ($paste->expiration != 0) {
            if ($paste->burnAfter == 0) {
                if (time() > strtotime($paste->expiration)) {
                    if ($isSameUser) $expiration = "Expired";
                    else abort('404');
                }
                else $expiration = Carbon::parse($paste->expiration)->diffForHumans();
            }
        }

        if ($paste->privacy == "private") {
            if ($isSameUser) $privacy = "Private";
            else abort('404');
        }
        elseif ($paste->privacy == "password") {
            $privacy = "Password-protected";
            if ($request->isMethod('post')) {
                if (!Hash::check(Input::get('pastePassword'), $paste->password)) return view('paste/password', ['link' => $paste->link, 'wrongPassword' => true]);
            }
            // Jika pengguna tidak sama dan paste dibuat lebih dari 3 detik yang lalu:
            elseif (!$isSameUser && time() - $paste->created_at->timestamp > 3) return view('paste/password', ['link' => $paste->link]);
        }
        elseif ($paste->privacy == "link") $privacy = "Public";
        else die("Error.");

        // Memeriksa apakah burnAfter harus dihapus (dilakukan setelah pemeriksaan password)
        if (isset($disableBurn)) {
            $paste->burnAfter = 0;
            $paste->save();
        }

        // Menambah angka view
        if (time()-$paste->updated_at->timestamp > 10) $paste->increment('views');

        return response(Crypt::decryptString($paste->content), 200)->header('Content-Type', 'text/plain');
      }
}