<?php
/*************************************************************
# 076 License

Copyright (c) テクニカル諏訪子

Permission is hereby granted to any person obtaining a copy of the software
Little Beast (the "Software") to use, modify, merge, copy, publish, distribute,
sublicense, and/or sell copies of the Software, subject to the following conditions:

    1. **Origin Attribution**:
       - You must not misrepresent the origin of the Software; you must not claim
         you created the original Software.
       - If the Software is used in a product, you must either:
         a. Provide clear attribution in the product's documentation, user interface,
            or other visible areas, **OR**
         b. Pay the original developers a fee they specify in writing.
    2. **Usage Restriction**:
       - The Software, or any derivative works, dependencies, or libraries
         incorporating it, must not be used for censorship or to suppress freedom of
         speech, expression, or creativity. Prohibited uses include, but are not
         limited to:
         - Censorship of so-called "hate speech", visuals, non-mainstream opinions,
           ideas, or objective reality.
         - Tools or systems designed to restrict access to information or
           artistic works.
    3. **Notice Preservation**:
       - This license and the above copyright notice must remain intact in all copies
         of the source code.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
namespace Std\Lib;

use Std\Lib\Fedi\Fedi;
use Result;

/**
 * サイトの通知（ヘッダーの「通知」）とメールの待ち行列
 *
 * データはdata/notifications/：
 *   {ユーザー名}.json  通知（新しい順、MAX件まで）
 *   mail/{ID}.json  送るメール（cronのnotifyが送る）
 *
 * 記事のコメントの通知（Comments）は表示する時に中身を探す。他の物（Gitler等）はlabel・page・excerptを入れて追加する。
 */
final class Notifications {
  /** 1人の通知の最大数 */
  public const MAX = 200;
  /** メールの再試行の回数 */
  private const MAIL_TRIES = 5;

  /** @var string|null 保存先（テスト用。既定はdata） */
  public static ?string $dataDir = null;

  /**
   * 通知（新しい順）
   *
   * @return array  type、from、at、read等
   */
  public static function list(string $username): array {
    if (!preg_match('/^[A-Za-z0-9]+$/', $username)) return [];
    return Fedi::read(self::path("notifications/{$username}.json"));
  }

  public static function unreadCount(string $username): int {
    return count(array_filter(self::list($username), fn($n) => empty($n['read'])));
  }

  public static function markRead(string $username): void {
    if (self::unreadCount($username) === 0) return;
    Fedi::update(self::path("notifications/{$username}.json"), fn($l) => array_map(fn($n) => ['read' => true] + $n, $l));
  }

  /**
   * 通知を追加する
   *
   * @param array $n  type、from（username、又はactor・name・handle・url・icon）等。label・page・excerptが有れば表示にそのまま使う
   * @param callable|null $same  未読の同じ通知が有れば追加しない（fn(array $old): bool）
   */
  public static function add(string $username, array $n, ?callable $same = null): void {
    if (!preg_match('/^[A-Za-z0-9]+$/', $username)) return;
    Fedi::update(self::path("notifications/{$username}.json"), function(array $l) use ($n, $same): array {
      if ($same !== null) foreach ($l as $old) if (empty($old['read']) && $same($old)) return $l;
      array_unshift($l, $n + ['at' => time(), 'read' => false]);
      return array_slice($l, 0, self::MAX);
    });
  }

  //////// メール

  /** メールを待ち行列に入れる（MAILER_ENABLEDでなければ何もしない） */
  public static function queueMail(string $to, string $subject, string $body, string $toName = ''): void {
    if (!MAILER_ENABLED || !filter_var($to, FILTER_VALIDATE_EMAIL)) return;
    Fedi::write(self::path('notifications/mail/'.Fedi::newId().'.json'), ['to' => $to, 'subject' => $subject, 'body' => $body, 'name' => $toName, 'tries' => 0]);
  }

  /**
   * 待っているメールを送る（cronのnotify）
   *
   * @param int $budget  この秒数を超えたら次に回す
   */
  public static function sendMail(int $budget = 50): Result {
    if (!MAILER_ENABLED) return Result::Success('メールは無効です。');
    $start = time();
    $sent = $failed = 0;
    $files = glob(self::path('notifications/mail/').'*.json') ?: [];
    sort($files);
    foreach ($files as $file) {
      if (time() - $start > $budget) break;
      // 同時に動いた別のcronと重ならない様に、名前を変えて取る
      $work = $file.'.work';
      if (!@rename($file, $work)) continue;
      $m = Fedi::read($work, null);
      if (!is_array($m) || !is_string($m['to'] ?? null)) {
        @unlink($work);
        continue;
      }
      if (Mailer::deliver($m['to'], (string)$m['subject'], (string)$m['body'], (string)($m['name'] ?? '') ?: null)->isSuccess) {
        @unlink($work);
        $sent++;
        continue;
      }
      $failed++;
      $m['tries'] = (int)($m['tries'] ?? 0) + 1;
      if ($m['tries'] < self::MAIL_TRIES) Fedi::write($file, $m);
      @unlink($work);
    }
    return Result::Success("メール：送信{$sent}件、失敗{$failed}件", ['sent' => $sent, 'failed' => $failed]);
  }

  private static function path(string $rel): string {
    $path = rtrim(self::$dataDir ?? ROOT.'/data', '/').'/'.$rel;
    $dir = dirname($path);
    if (!is_dir($dir)) @mkdir($dir, 0700, true);
    return $path;
  }
}