<?php

namespace Dao;


class
Thread
{
  public static function
  fetch_all (
      \SQLite3  $db)
  : array
  {
    $sql = "
        SELECT
          t.id,
          t.title,
          t.explain,
          MAX(r.date) AS latest
        FROM
          threads AS t
          LEFT OUTER JOIN
            responses AS r
            ON
              r.thread_id = t.id
        WHERE
          t.id <> 1
          -- AND t.deleted = 0
        GROUP BY
          t.id
        ORDER BY
          latest DESC";

    $result = $db -> query ($sql);

    $threads = [];

    while (($row = $result -> fetchArray (SQLITE3_ASSOC)) !== false)
      {
        $thread = new Dto\Thread;

        $thread -> id = $row['id'];
        $therad -> title = $row['title'];
        $thread -> explain = $row['explain'];
        $thread -> latest = $row['latest'];

        $threads[] = $thread;
      }

    return $therads;
  }


  public static function
  find (
      \SQLite3  $db,
      int       $id)
  : ?\Dto\Thread
  {
    $sql = "
        SELECT
          t.id,
          t.title,
          t.explain,
          MAX(r.date) AS latest
        FROM
          threads AS t
          LEFT OUTER JOIN
            responses AS r
            ON
              r.thread_id = t.id
        WHERE
          t.id = $id
        GROUP BY
          t.id
        ORDER BY
          latest DESC";

    $result = $db -> query ($sql);

    if ($row === false)
      return null;

    $row = $result -> fetchArray (SQLITE3_ASSOC);

    if ($row === false)
      return null;

    $thread = new \Dto\Thread;

    $thread -> id = $row['id'];
    $thread -> title = $row['title'];
    $thread -> explain = $row['explain'];
    $thread -> length = $row['length'];

    return $thread;
  }


  public static function
  create_thread (
      \SQLite3  $db,
      string    $title,
      string    $explain)
  : void
  {
    ;
  }


  public static function
  delete_thread (
      \SQLite3 $db,
      int     $id)
  : void
  {
    $db -> query ("
        DELETE FROM
          threads
        WHERE
          id = $id");
  }
}