<?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\Fedi;

/**
 * ローカルの投稿の保存（data/ap/notes/{ID}.json）
 */
final class Notes {
  public static function path(string $id): string {
    return Fedi::path("notes/{$id}.json");
  }

  public static function get(string $id): ?array {
    if (!preg_match('/^[0-9a-f]{20}$/', $id)) return null;
    return Fedi::read(self::path($id), null);
  }

  public static function save(array $note): bool {
    return Fedi::write(self::path($note['id']), $note);
  }

  /**
   * 投稿をロックして変更する
   *
   * @return array|null  変更後の投稿、無ければnull
   */
  public static function modify(string $id, callable $fn): ?array {
    if (self::get($id) === null) return null;
    return Fedi::update(self::path($id), fn($n) => $n ? $fn($n) : $n, null);
  }

  public static function delete(string $id): void {
    @unlink(self::path($id));
  }

  /** 投稿のURL（オブジェクトのID） */
  public static function url(array $note): string {
    return Fedi::noteUrl($note['author'], $note['id']);
  }

  /** 投稿のページ（HTML） */
  public static function htmlUrl(string $objectId): string {
    return Fedi::base().'/microblog/note?id='.rawurlencode($objectId);
  }

  /**
   * ActivityPubのNote
   */
  public static function toObject(array $note): array {
    $url = self::url($note);
    $obj = [
      '@context' => Fedi::CONTEXT,
      'id' => $url,
      'type' => 'Note',
      'attributedTo' => Fedi::actorUrl($note['author']),
      'content' => $note['content'],
      'source' => ['content' => $note['source'], 'mediaType' => 'text/markdown'],
      'to' => $note['to'],
      'cc' => $note['cc'],
      'published' => $note['published'],
      'url' => self::htmlUrl($url),
      'sensitive' => (bool)$note['sensitive'],
      'tag' => $note['tags'],
      // 「path」は削除用の内部の項目なので外す
      'attachment' => array_map(fn($a) => array_diff_key($a, ['path' => 1]), $note['attachments']),
      'replies' => [
        'id' => "{$url}/replies",
        'type' => 'Collection',
        'totalItems' => count($note['replies'] ?? []),
      ],
      'likes' => ['id' => "{$url}/likes", 'type' => 'Collection', 'totalItems' => count($note['likes'] ?? [])],
      'shares' => ['id' => "{$url}/shares", 'type' => 'Collection', 'totalItems' => count($note['boosts'] ?? [])],
    ];
    if (($note['summary'] ?? '') !== '') $obj['summary'] = $note['summary'];
    if (!empty($note['inReplyTo'])) $obj['inReplyTo'] = $note['inReplyTo'];
    if (!empty($note['updated'])) $obj['updated'] = $note['updated'];
    return $obj;
  }

  /** Createアクティビティ */
  public static function toCreate(array $note): array {
    $obj = self::toObject($note);
    unset($obj['@context']);
    return [
      '@context' => Fedi::CONTEXT,
      'id' => self::url($note).'/activity',
      'type' => 'Create',
      'actor' => Fedi::actorUrl($note['author']),
      'published' => $note['published'],
      'to' => $note['to'],
      'cc' => $note['cc'],
      'object' => $obj,
    ];
  }
}