<?php

/**
 * This file is part of the Propel package.
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 * @license    MIT License
 */

/**
 * A class that holds build properties and provide a class loading mechanism for the generator.
 *
 * @author     Hans Lellelid <hans@xmpl.org>
 * @package    propel.generator.config
 */
class GeneratorConfig {

  /**
   * The build properties.
   *
   * @var        array
   */
  private $buildProperties = array();

  /**
   * Construct a new GeneratorConfig.
   * @param      mixed $props Array or Iterator
   */
  public function __construct($props = null)
  {
    if ($props) $this->setBuildProperties($props);
  }

  /**
   * Gets the build properties.
   * @return     array
   */
  public function getBuildProperties()
  {
    return $this->buildProperties;
  }

  /**
   * Parses the passed-in properties, renaming and saving eligible properties in this object.
   *
   * Renames the propel.xxx properties to just xxx and renames any xxx.yyy properties
   * to xxxYyy as PHP doesn't like the xxx.yyy syntax.
   *
   * @param      mixed $props Array or Iterator
   */
  public function setBuildProperties($props)
  {
    $this->buildProperties = array();

    $renamedPropelProps = array();
    foreach ($props as $key => $propValue) {
      if (strpos($key, "propel.") === 0) {
        $newKey = substr($key, strlen("propel."));
        $j = strpos($newKey, '.');
        while ($j !== false) {
          $newKey =  substr($newKey, 0, $j) . ucfirst(substr($newKey, $j + 1));
          $j = strpos($newKey, '.');
        }
        $this->setBuildProperty($newKey, $propValue);
      }
    }
  }

  /**
   * Gets a specific propel (renamed) property from the build.
   *
   * @param      string $name
   * @return     mixed
   */
  public function getBuildProperty($name)
  {
    return isset($this->buildProperties[$name]) ? $this->buildProperties[$name] : null;
  }

  /**
   * Sets a specific propel (renamed) property from the build.
   *
   * @param      string $name
   * @param      mixed $value
   */
  public function setBuildProperty($name, $value)
  {
    $this->buildProperties[$name] = $value;
  }

  /**
   * Resolves and returns the class name based on the specified property value.
   *
   * @param      string $propname The name of the property that holds the class path (dot-path notation).
   * @return     string The class name.
   * @throws     BuildException If the classname cannot be determined or class cannot be loaded.
   */
  public function getClassname($propname)
  {
    $classpath = $this->getBuildProperty($propname);
    if (empty($classpath)) {
      throw new BuildException("Unable to find class path for '$propname' property.");
    }

    // This is a slight hack to workaround camel case inconsistencies for the DDL classes.
    // Basically, we want to turn ?.?.?.sqliteDDLBuilder into ?.?.?.SqliteDDLBuilder
    $lastdotpos = strrpos($classpath, '.');
    if ($lastdotpos !== null) {
      $classpath{$lastdotpos+1} = strtoupper($classpath{$lastdotpos+1});
    } else {
      $classpath = ucfirst($classpath);
    }

    if (empty($classpath)) {
      throw new BuildException("Unable to find class path for '$propname' property.");
    }

    $clazz = Phing::import($classpath);

    return $clazz;
  }

  /**
   * Resolves and returns the builder class name.
   *
   * @param      string $type
   * @return     string The class name.
   */
  public function getBuilderClassname($type)
  {
    $propname = 'builder' . ucfirst(strtolower($type)) . 'Class';
    return $this->getClassname($propname);
  }

  /**
   * Creates and configures a new Platform class.
   *
   * @param      PDO $con
   * @return     Platform
   */
  public function getConfiguredPlatform(PDO $con = null)
  {
    $clazz = $this->getClassname("platformClass");
    $platform = new $clazz();

    if (!$platform instanceof Platform) {
      throw new BuildException("Specified platform class ($clazz) does not implement Platform interface.", $this->getLocation());
    }

    $platform->setConnection($con);
    $platform->setGeneratorConfig($this);
    return $platform;
  }

  /**
   * Creates and configures a new SchemaParser class for specified platform.
   * @param      PDO $con
   * @return     SchemaParser
   */
  public function getConfiguredSchemaParser(PDO $con = null)
  {
    $clazz = $this->getClassname("reverseParserClass");
    $parser = new $clazz();
    if (!$parser instanceof SchemaParser) {
      throw new BuildException("Specified platform class ($clazz) does implement SchemaParser interface.", $this->getLocation());
    }
    $parser->setConnection($con);
    $parser->setGeneratorConfig($this);
    return $parser;
  }

  /**
   * Gets a configured data model builder class for specified table and based on type.
   *
   * @param      Table $table
   * @param      string $type The type of builder ('ddl', 'sql', etc.)
   * @return     DataModelBuilder
   */
  public function getConfiguredBuilder(Table $table, $type, $cache = true)
  {
    $classname = $this->getBuilderClassname($type);
    $builder = new $classname($table);
    $builder->setGeneratorConfig($this);
    return $builder;
  }

  /**
   * Gets a configured Pluralizer class.
   *
   * @return     Pluralizer
   */
  public function getConfiguredPluralizer()
  {
    $classname = $this->getBuilderClassname('pluralizer');
    $pluralizer = new $classname();
    return $pluralizer;
  }
  
  /**
   * Gets a configured behavior class
   *
   * @param string $name a behavior name
   * @return string a behavior class name
   */
  public function getConfiguredBehavior($name)
  {
    $propname = 'behavior' . ucfirst(strtolower($name)) . 'Class';
    try {
      $ret = $this->getClassname($propname);
    } catch (BuildException $e) {
      // class path not configured
      $ret = false;
    }
    return $ret;    
  }
}