<?php

/**
 * sfMessageSource_SQLite class file.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the BSD License.
 *
 * Copyright(c) 2004 by Qiang Xue. All rights reserved.
 *
 * To contact the author write to {@link mailto:qiang.xue@gmail.com Qiang Xue}
 * The latest version of PRADO can be obtained from:
 * {@link http://prado.sourceforge.net/}
 *
 * @author     Wei Zhuo <weizhuo[at]gmail[dot]com>
 * @version    $Id: sfMessageSource_SQLite.class.php 9128 2008-05-21 00:58:19Z Carl.Vondrick $
 * @package    symfony
 * @subpackage i18n
 */

/**
 * sfMessageSource_SQLite class.
 * 
 * Retrieve the message translation from a SQLite database.
 *
 * See the MessageSource::factory() method to instantiate this class.
 *
 * SQLite schema:
 *
 * CREATE TABLE catalogue (
 *   cat_id INTEGER PRIMARY KEY,
 *   name VARCHAR NOT NULL,
 *   source_lang VARCHAR,
 *   target_lang VARCHAR,
 *   date_created INT,
 *   date_modified INT,
 *   author VARCHAR);
 *
 * CREATE TABLE trans_unit (
 *   msg_id INTEGER PRIMARY KEY,
 *   cat_id INTEGER NOT NULL DEFAULT '1',
 *   id VARCHAR,
 *   source TEXT,
 *   target TEXT,
 *   comments TEXT,
 *   date_added INT,
 *   date_modified INT,
 *   author VARCHAR,
 *   translated INT(1) NOT NULL DEFAULT '0');
 *
 * Propel schema (in .xml format):
 *
 *  <database ...>
 *    ...
 *    <table name="catalogue">
 *     <column name="cat_id" type="integer" required="true" primaryKey="true" autoincrement="true" />
 *     <column name="name" type="varchar" size="100" />
 *     <column name="source_lang" type="varchar" size="100" />
 *     <column name="target_lang" type="varchar" size="100" />
 *     <column name="date_created" type="timestamp" />
 *     <column name="date_modified" type="timestamp" />
 *     <column name="author" type="varchar" size="255" />
 *    </table>
 *
 *    <table name="trans_unit">
 *     <column name="msg_id" type="integer" required="true" primaryKey="true" autoincrement="true" />
 *     <column name="cat_id" type="integer" />
 *       <foreign-key foreignTable="catalogue" onDelete="cascade">
 *         <reference local="cat_id" foreign="cat_id"/>
 *       </foreign-key>
 *     <column name="id" type="varchar" size="255" />
 *     <column name="source" type="longvarchar" />
 *     <column name="target" type="longvarchar" />
 *     <column name="comments" type="longvarchar" />
 *     <column name="date_created" type="timestamp" />
 *     <column name="date_modified" type="timestamp" />
 *     <column name="author" type="varchar" size="255" />
 *     <column name="translated" type="integer" />
 *    </table>
 *    ...
 *  </database>
 *
 * @author Xiang Wei Zhuo <weizhuo[at]gmail[dot]com>
 * @version v1.0, last update on Fri Dec 24 16:58:58 EST 2004
 * @package    symfony
 * @subpackage i18n
 */
class sfMessageSource_SQLite extends sfMessageSource_Database
{
  /**
   * The SQLite datasource, the filename of the database.
   * @var string 
   */
  protected $source;

  /**
   * Constructor.
   * Creates a new message source using SQLite.
   * @see MessageSource::factory();
   * @param string $source SQLite datasource, in PEAR's DB DSN format.
   */
  function __construct($source)
  {
    $dsn = $this->parseDSN((string) $source);
    $this->source = $dsn['database'];
  }

  /**
   * Gets an array of messages for a particular catalogue and cultural variant.
   *
   * @param string $variant the catalogue name + variant
   * @return array translation messages.
   */
  public function &loadData($variant)
  {
    $variant = sqlite_escape_string($variant);

    $statement =
      "SELECT t.id, t.source, t.target, t.comments
        FROM trans_unit t, catalogue c
        WHERE c.cat_id =  t.cat_id
          AND c.name = '{$variant}'
        ORDER BY id ASC";

    $db = sqlite_open($this->source);
    $rs = sqlite_query($statement, $db);

    $result = array();

    while($row = sqlite_fetch_array($rs, SQLITE_NUM))
    {
      $source = $row[1];
      $result[$source][] = $row[2]; //target
      $result[$source][] = $row[0]; //id
      $result[$source][] = $row[3]; //comments
    }

    sqlite_close($db);

    return $result;
  }

  /**
   * Gets the last modified unix-time for this particular catalogue+variant.
   * We need to query the database to get the date_modified.
   *
   * @param string $source catalogue+variant
   * @return int last modified in unix-time format.
   */
  protected function getLastModified($source)
  {
    $source = sqlite_escape_string($source);

    $db = sqlite_open($this->source);

    $rs = sqlite_query("SELECT date_modified FROM catalogue WHERE name = '{$source}'", $db);

    $result = $rs ? intval(sqlite_fetch_single($rs)) : 0;

    sqlite_close($db);

    return $result;
  }

  /**
   * Checks if a particular catalogue+variant exists in the database.
   *
   * @param string $variant catalogue+variant
   * @return boolean true if the catalogue+variant is in the database, false otherwise.
   */
  public function isValidSource($variant)
  {
    $variant = sqlite_escape_string($variant);
    $db = sqlite_open($this->source);
    $rs = sqlite_query("SELECT COUNT(*) FROM catalogue WHERE name = '{$variant}'", $db);
    $result = $rs && intval(sqlite_fetch_single($rs));
    sqlite_close($db);

    return $result;
  }

  /**
   * Retrieves catalogue details, array($cat_id, $variant, $count).
   *
   * @param string $catalogue catalogue
   * @return array catalogue details, array($cat_id, $variant, $count).
   */
  protected function getCatalogueDetails($catalogue = 'messages')
  {
    if (empty($catalogue))
    {
      $catalogue = 'messages';
    }

    $variant = $catalogue.'.'.$this->culture;

    $name = sqlite_escape_string($this->getSource($variant));

    $db = sqlite_open($this->source);

    $rs = sqlite_query("SELECT cat_id FROM catalogue WHERE name = '{$name}'", $db);

    if (sqlite_num_rows($rs) != 1)
    {
      return false;
    }

    $cat_id = intval(sqlite_fetch_single($rs));

    // first get the catalogue ID
    $rs = sqlite_query("SELECT count(msg_id) FROM trans_unit WHERE cat_id = {$cat_id}", $db);

    $count = intval(sqlite_fetch_single($rs));

    sqlite_close($db);

    return array($cat_id, $variant, $count);
  }

  /**
   * Updates the catalogue last modified time.
   *
   * @return boolean true if updated, false otherwise. 
   */
  protected function updateCatalogueTime($cat_id, $variant, $db)
  {
    $time = time();

    $result = sqlite_query("UPDATE catalogue SET date_modified = {$time} WHERE cat_id = {$cat_id}", $db);

    if ($this->cache)
    {
      $this->cache->remove($variant.':'.$this->culture);
    }

    return $result;
  }

  /**
   * Saves the list of untranslated blocks to the translation source. 
   * If the translation was not found, you should add those
   * strings to the translation source via the <b>append()</b> method.
   *
   * @param string $catalogue the catalogue to add to
   * @return boolean true if saved successfuly, false otherwise.
   */
  function save($catalogue = 'messages')
  {
    $messages = $this->untranslated;

    if (count($messages) <= 0)
    {
      return false;
    }

    $details = $this->getCatalogueDetails($catalogue);

    if ($details)
    {
      list($cat_id, $variant, $count) = $details;
    }
    else
    {
      return false;
    }

    if ($cat_id <= 0)
    {
      return false;
    }
    $inserted = 0;

    $db = sqlite_open($this->source);
    $time = time();

    foreach ($messages as $message)
    {
      $message = sqlite_escape_string($message);
      if (sqlite_query("INSERT INTO trans_unit (cat_id, id, source, date_added) VALUES ({$cat_id}, {$count}, '{$message}', $time)", $db))
      {
        $count++;
        $inserted++;
      }
    }
    if ($inserted > 0)
    {
      $this->updateCatalogueTime($cat_id, $variant, $db);
    }

    sqlite_close($db);

    return $inserted > 0;
  }

  /**
   * Updates the translation.
   *
   * @param string $text      the source string.
   * @param string $target    the new translation string.
   * @param string $comments  comments
   * @param string $catalogue the catalogue of the translation.
   * @return boolean true if translation was updated, false otherwise. 
   */
  function update($text, $target, $comments, $catalogue = 'messages')
  {
    $details = $this->getCatalogueDetails($catalogue);
    if ($details)
    {
      list($cat_id, $variant, $count) = $details;
    }
    else
    {
      return false;
    }

    $comments = sqlite_escape_string($comments);
    $target = sqlite_escape_string($target);
    $text = sqlite_escape_string($text);

    $time = time();

    $db = sqlite_open($this->source);

    sqlite_query("UPDATE trans_unit SET target = '{$target}', comments = '{$comments}', date_modified = '{$time}' WHERE cat_id = {$cat_id} AND source = '{$text}'", $db);

    if (sqlite_changes($db))
    {
      $this->updateCatalogueTime($cat_id, $variant, $db);
      $updated = true;
    }
    else
    {
      $updated = false;
    }

    sqlite_close($db);

    return $updated;
  }

  /**
   * Deletes a particular message from the specified catalogue.
   *
   * @param string  $source     the source message to delete.
   * @param string  $catalogue  the catalogue to delete from.
   * @return boolean true if deleted, false otherwise. 
   */
  function delete($message, $catalogue = 'messages')
  {
    $details = $this->getCatalogueDetails($catalogue);
    if ($details)
    {
      list($cat_id, $variant, $count) = $details;
    }
    else
    {
      return false;
    }

    $db = sqlite_open($this->source);
    $text = sqlite_escape_string($message);

    sqlite_query("DELETE FROM trans_unit WHERE cat_id = {$cat_id} AND source = '{$message}'", $db);

    if (sqlite_changes($db))
    {
      $this->updateCatalogueTime($cat_id, $variant, $db);
      $deleted = true;
    }
    else
    {
      $deleted = false;
    }

    sqlite_close($db);

    return $deleted;
  }

  /**
   * Returns a list of catalogue as key and all it variants as value.
   *
   * @return array list of catalogues 
   */
  function catalogues()
  {
    $db = sqlite_open($this->source);
    $statement = 'SELECT name FROM catalogue ORDER BY name';
    $rs = sqlite_query($statement, $db);
    $result = array();
    while ($row = sqlite_fetch_array($rs, SQLITE_NUM))
    {
      $details = explode('.', $row[0]);
      if (!isset($details[1]))
      {
        $details[1] = null;
      }

      $result[] = $details;
    }
    sqlite_close($db);

    return $result;
  }
}
