<?php
  require_once('../config.php');

  $title = SITE_NAME;
  $h1 = SITE_NAME;

  function mkstring () {
    $stringchars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890';
    $newstring = '';

    for ($i = 0; $i < 5; $i++) $newstring .= $stringchars[rand(0, strlen($stringchars))];
    foreach ($arr as $k => $v) {
      if ($newstring == $k) return mkstring();
    }

    return $newstring;
  }

  // パラメートルがなければ、スキップ。
  if (isset($_POST['sosin'])) {
    $newadd = $_POST['newadd'];
    if (!str_starts_with($newadd, 'http://') && !str_starts_with($newadd, 'https://')) {
      $title = '076エラー - 不正なURL';
      $h1 = '【エラー】不正なURL';
      $bg = 'daityan';
      $bgpos = 'top right 100px';
      $err = 'URLは「http://」又は「https://」で始まります。';
      include_once('../views/404.php');
      exit;
    }

    $data = file_get_contents('links.json');

    $arr = json_decode($data, true);
    foreach ($arr as $k => $v) {
      if ($newadd == $v) {
        header('Location: /?newurl='.$k);
        exit;
      }
    }

    $newstring = mkstring();

    $arr[$newstring] = $newadd;
    $newdata = json_encode($arr);
    file_put_contents('links.json', $newdata);

    header('Location: /?newurl='.$newstring);
    exit;
  }
  else if (null === $_GET['url'] && null !== $_GET['newurl']) {
    $newurl = $_GET['newurl'];
    $bg = 'kasen';
    $bgpos = 'top 10px left 120px';
    include_once('../views/submitted.php');
  }
  else if (null !== $_GET['url'] && $_GET['url'] != '') {
    $data = file_get_contents('links.json');

    foreach (json_decode($data) as $k => $v) {
      // jsonファイルでキーを見つければ、転送されます。なければ、４０４エラーが出ます。
      if ($_GET['url'] == $k) {
        header('Location: '.$v);
        exit;
      }
    }
  }
  else if (null === $_GET['url'] && $_SERVER['REQUEST_URI'] == '/') {
    $bg = 'rumia';
    $bgpos = 'top -30px right 90px';
    include_once('../views/index.php');
  }
  else {
    $title = '076エラー - 未検出';
    $h1 = '【４０４】未検出';
    $bg = 'daityan';
    $bgpos = 'top right 100px';
    $err = 'このURLを見つけられませんでした。';
    include_once('../views/404.php');
  }
?>