<?php
class HashtagAddon extends Addon
{
  public $name = "게시글 해시태그 추적 애드온";
  public $description = "해시태그 추적 애드온";
  public $author = "Amber";
  public $link = "https://info.drk.st/about";
  public $version = "1.0.0";

  public $className;
  public $addonPath;
  public $addonFile;

  /**
   * 애드온 생성자입니다.
   * @return void
   */
  public function __construct()
  {
  }

  public function init($data = [])
  {
    $that = $this;

    EventHAndler::addEventHandler(
      "amber.load_config_after",
      function ($args = null) {
        global $g5;

        $g5['hashtags_table'] = G5_TABLE_PREFIX . 'hashtags';
        $g5['hashtag_posts_table'] = G5_TABLE_PREFIX . 'hashtag_posts';

        if (!sql_fetch_array(sql_query("DESC {$g5['hashtags_table']}"))) {
          sql_query("CREATE TABLE {$g5['hashtags_table']} (
            `srl` INT(11) NOT NULL AUTO_INCREMENT,
            `h_name` VARCHAR(255) NULL DEFAULT '' COLLATE 'utf8mb3_general_ci',
            `h_hidden` INT(11) NOT NULL DEFAULT '0',
            `h_created_at` DATETIME NULL DEFAULT current_timestamp(),
            `h_updated_at` DATETIME NULL DEFAULT current_timestamp() ON UPDATE current_timestamp(),
            PRIMARY KEY (`srl`) USING BTREE
          )
          COLLATE='utf8mb3_general_ci'
          ENGINE=MyISAM");
        }

        if (!sql_fetch_array(sql_query("DESC {$g5['hashtag_posts_table']}"))) {
          sql_query("CREATE TABLE {$g5['hashtag_posts_table']} (
            `post_id` INT(11) NOT NULL,
            `board_id` VARCHAR(255) NOT NULL,
            `srl` INT NOT NULL,
            `created_at` DATETIME NULL DEFAULT current_timestamp(),
            PRIMARY KEY (`post_id`, `board_id`, `srl`),
            FOREIGN KEY (`srl`) REFERENCES {$g5['hashtags_table']}(`srl`) ON DELETE CASCADE
          )
          COLLATE='utf8mb3_general_ci'
          ENGINE=MyISAM");
        }
      },
      10
    );

    EventHandler::addEventHandler(
      "gnuboard.bbs.write_update_document_create",
      function ($args = null) use ($that) {
        $that->writeUpdateDocumentUpdate($args);
      }
      ,
      10
    );

    EventHandler::addEventHandler(
      "gnuboard.bbs.write_update_document_update",
      function ($args = null) use ($that) {
        $that->writeUpdateDocumentUpdate($args);
      }
      ,
      10
    );

    EventHandler::addEventHandler(
      "gnuboard.bbs.delete",
      function ($args = null) use ($that) {
        $bo_table = $_POST["bo_table"];
        $write = $args[0];

        $that->delete_hashtags($bo_table, $write['wr_id']);
      }
      ,
      10
    );
  }

  public function extract_hashtags($content)
  {
    preg_match_all('/#([A-Za-z0-9가-힣ㄱ-ㅎㅏ-ㅣ_]+)/', $content, $matches);
    return $matches[1];
  }

  public function delete_hashtags($bo_table, $wr_id)
  {
    global $g5;
    sql_query("DELETE FROM {$g5['hashtag_posts_table']} WHERE `board_id` = '{$bo_table}' AND `post_id` = '{$wr_id}'");
    $sql = "SELECT h.srl, COUNT(hp.srl) AS count
            FROM {$g5['hashtags_table']} h
            LEFT JOIN {$g5['hashtag_posts_table']} hp 
            ON h.srl = hp.srl
            GROUP BY h.srl
            HAVING count = 0";

    $result = sql_query($sql);

    while ($row = sql_fetch_array($result)) {
      $delete_srl = $row['srl'];
      $delete_sql = "DELETE FROM {$g5['hashtags_table']} WHERE srl = '$delete_srl'";
      sql_query($delete_sql);
    }
  }

  public function proc_hashtags($bo_table, $wr_id, $content)
  {
    global $g5;
    // if post update, reset hashtag data - arcturus
    $this->delete_hashtags($bo_table, $wr_id);

    $hashtags = $this->extract_hashtags($content);
    foreach ($hashtags as $hashtag) {
      $q = sql_fetch("SELECT `srl` FROM `{$g5['hashtags_table']}` WHERE `h_name` = '{$hashtag}'");
      if (!$q) {
        sql_query("INSERT INTO {$g5['hashtags_table']} SET `h_name` = '{$hashtag}', `h_hidden` = 0");
        $q = sql_fetch("SELECT `srl` FROM `{$g5['hashtags_table']}` WHERE `h_name` = '{$hashtag}'");
      }
      sql_query("INSERT INTO {$g5['hashtag_posts_table']} SET `board_id` = '{$bo_table}', `post_id` = '{$wr_id}', `srl` = '{$q['srl']}'");
    }
  }

  public function writeUpdateDocumentUpdate($data)
  {
    global $is_admin;

    if ($is_admin) {
      $wr_content = '';
      if (isset($_POST['wr_content'])) {
        $wr_content = substr(trim($_POST['wr_content']), 0, 65536);
        $wr_content = preg_replace("#[\\\]+$#", "", $wr_content);
      }

      $bo_table = isset($data[0]) ? $data[0] : '';
      $wr_id = isset($data[2]) ? $data[2] : '';

      $this->proc_hashtags($bo_table, $wr_id, $wr_content);
    }
  }

  public function printConfigForm()
  {
    // $config = $this->getConfig();
    echo '현재 애드온에 별도의 설정이 없습니다.';
  }

  public function getConfig()
  {
    global $g5;

    $sql = "SELECT addon_config FROM {$g5['addons_config_table']} WHERE addon_name = '{$this->className}'";
    $result = sql_fetch($sql);

    if ($result && isset($result['addon_config'])) {
      return json_decode($result['addon_config'], true) ?: [];
    }

    return [];
  }
}