<?php

/**
 * NoteModel
 * This is basically a simple CRUD (Create/Read/Update/Delete) demonstration.
 */
class NoteModel
{
  /**
   * Get all notes (notes are just example data that the user has created)
   * @return array an array with several objects (the results)
   */
  public static function getAllNotes()
  {
    $database = DatabaseFactory::getFactory()->getConnection();

    $sql = "SELECT note_id, note_text, note_timestamp FROM notes WHERE user_id = :user_id ORDER BY note_timestamp DESC";
    $query = $database->prepare($sql);
    $query->execute(array(':user_id' => Session::get('user_id')));

    // fetchAll() is the PDO method that gets all result rows
    $notes = $query->fetchAll();
    
    // Add markdown HTML to each note
    require_once __DIR__ . '/../libs/SimpleMarkdown.php';
    foreach ($notes as &$note) {
        $note->note_html = SimpleMarkdown::parse($note->note_text);
    }
    
    return $notes;
  }

  /**
   * Get a single note
   * @param int $note_id id of the specific note
   * @return object a single object (the result)
   */
  public static function getNote($note_id)
  {
    $database = DatabaseFactory::getFactory()->getConnection();

    $sql = "SELECT note_id, note_text, note_timestamp FROM notes WHERE user_id = :user_id AND note_id = :note_id LIMIT 1";
    $query = $database->prepare($sql);
    $query->execute(array(':user_id' => Session::get('user_id'), ':note_id' => $note_id));

    $result = $query->fetch();
    
    // Add markdown HTML
    if ($result) {
        require_once __DIR__ . '/../libs/SimpleMarkdown.php';
        $result->note_html = SimpleMarkdown::parse($result->note_text);
    }
    
    return $result ? $result : null;
  }

  /**
   * Set a note (create a new one)
   * @param string $note_text note text that will be created
   * @return bool feedback (was the note created properly ?)
   */
  public static function createNote($note_text)
  {
    if (!$note_text || strlen($note_text) == 0) {
      Session::add('feedback_negative', Text::get('FEEDBACK_NOTE_CREATION_FAILED'));
      return false;
    }

    $database = DatabaseFactory::getFactory()->getConnection();

    $sql = "INSERT INTO notes (note_text, user_id) VALUES (:note_text, :user_id)";
    $query = $database->prepare($sql);
    $query->execute(array(':note_text' => $note_text, ':user_id' => Session::get('user_id')));

    if ($query->rowCount() == 1) {
      return true;
    }

    // default return
    Session::add('feedback_negative', Text::get('FEEDBACK_NOTE_CREATION_FAILED'));
    return false;
  }

  /**
   * Update an existing note
   * @param int $note_id id of the specific note
   * @param string $note_text new text of the specific note
   * @return bool feedback (was the update successful ?)
   */
  public static function updateNote($note_id, $note_text)
  {
    if (!$note_id || !$note_text) {
      return false;
    }

    $database = DatabaseFactory::getFactory()->getConnection();

    $sql = "UPDATE notes SET note_text = :note_text WHERE note_id = :note_id AND user_id = :user_id LIMIT 1";
    $query = $database->prepare($sql);
    $query->execute(array(':note_id' => $note_id, ':note_text' => $note_text, ':user_id' => Session::get('user_id')));

    if ($query->rowCount() == 1) {
      return true;
    }

    Session::add('feedback_negative', Text::get('FEEDBACK_NOTE_EDITING_FAILED'));
    return false;
  }

  /**
   * Delete a specific note
   * @param int $note_id id of the note
   * @return bool feedback (was the note deleted properly ?)
   */
  public static function deleteNote($note_id)
  {
    if (!$note_id) {
      return false;
    }

    $database = DatabaseFactory::getFactory()->getConnection();

    $sql = "DELETE FROM notes WHERE note_id = :note_id AND user_id = :user_id LIMIT 1";
    $query = $database->prepare($sql);
    $query->execute(array(':note_id' => $note_id, ':user_id' => Session::get('user_id')));

    if ($query->rowCount() == 1) {
      return true;
    }

    // default return
    Session::add('feedback_negative', Text::get('FEEDBACK_NOTE_DELETION_FAILED'));
    return false;
  }
}