<?php
  $lang = isset($_COOKIE['lang']) ? $_COOKIE['lang'] : 'ja';

  if (isset($_POST['langchange'])) {
    $lang = null !== $_COOKIE['lang'] && $_COOKIE['lang'] == 'en' ? 'ja' : 'en';
    setcookie('lang', $lang);
    unset($_POST['langchange']);
    header('Location: /');
  }

  include('../lang/'.$lang.'.php');
  require_once('../config.php');

  $title = $lang == 'en' ? SITE_NAME_EN : SITE_NAME_JA;

  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 .= '〜'.LOC_FUSEINA_URL;
      $err = LOC_ERROR_URL_HTTP_HTTPS;
      include_once('../views/404.php');
      exit;
    }

    if (strlen($newadd) > 500) {
      $title .= '〜'.LOC_FUSEINA_URL;
      $err = 'URLは500文字以内です。';
      include_once('../views/404.php');
      exit;
    }

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

    $arr = json_decode($data, true);
    foreach ($arr as $k => $v) {
      if ($newadd == $v) {
        if (isset($_POST['api']) && $_POST['api'] == 1) {
          header('Content-Type: application/json');
          echo json_encode(['res' => $k]);
        }
        else header('Location: /?newurl='.$k);
        exit;
      }
    }

    $newstring = mkstring();

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

    if (isset($_POST['api']) && $_POST['api'] == 1) {
      header('Content-Type: application/json');
      echo json_encode(['res' => $newstring]);
    }
    else header('Location: /?newurl='.$newstring);
    exit;
  }
  else if (!isset($_GET['url']) && isset($_GET['newurl'])) {
    $title .= '〜'.LOC_TANSYUKUZUMI;
    $newurl = $_GET['newurl'];
    include_once('../views/submitted.php');
  }
  else if (isset($_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'] == $k) {
        if (isset($_GET['api']) && $_GET['api'] == 1) {
          header('Content-Type: application/json');
          echo json_encode(['res' => $v]);
        }
        else header('Location: '.$v);
        exit;
      }
      else {
        $title .= '〜'.LOC_MIKENSYUTU;
        $err = LOC_ERROR_URL_MITUKAREMASEN;
        include_once('../views/404.php');
      }
    }
  }
  else if (!isset($_GET['url']) && $_SERVER['REQUEST_URI'] == '/') {
    $title .= '〜'.LOC_TOP;
    include_once('../views/index.php');
  }
  else {
    $title .= '〜'.LOC_MIKENSYUTU;
    $err = LOC_ERROR_URL_MITUKAREMASEN;
    include_once('../views/404.php');
  }
?>