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<?php

require_once __DIR__ . '/../Application.php';

require_once __DIR__ . '/../AbstractModel.php';

/**

 * Generic database table model class

 *

 * @author Thomas Lahn

 * @property Database $database

 * @property-read int $lastInsertId

 *   ID of the last inserted row, or the last value from

     a sequence object, depending on the underlying driver.

 */

class Table extends AbstractModel

{

  /**

   * Name of the table

   */

  protected $_name = '';

  /**

   * Database of the table

   * @var Database|string

   */

  protected $_database;

  protected $_id = 'id';

  /**

   * Creates a new <code>Table</code> instance.

   *

   * Each of the parameters is optional and can also be given

   * by a protected property where the parameter name is preceded

   * by <code>_</code>.  Parameter values overwrite the default

   * property values.  It is recommended to use default property

   * values of inheriting classes except for small applications

   * and testing purposes.

   *

   * @param Database $database

   *   Database of the table (required in order to use a fitting

   *   query language)

   * @param string $name

   *   Table name

   * @param string $id

   *   Name of the primary key column

   * @throws InvalidArgumentException

   */

  public function __construct($database = null, $name = '', $id = '')

  {

    if ($database === null)

    {

                /* Call getter to convert to Database if possible */

        if ($this->database === null)

        {

                $this->_database = Application::getInstance()->getDefaultDatabase();

        }

    }

    else

    {

      $this->_database = $database;

    }

    if ($name !== '')

    {

      $this->_name = $name;

    }

    if (!\is_string($this->_name))

    {

      throw new \InvalidArgumentException(

        'Expected string for table name, saw '

                                . \get_class($this->_name) || \gettype($this->_name));

    }

    if ($id !== '')

    {

      $this->_id = $id;

    }

  }

  /**

   * Returns the database for the table

   * @return Database

   */

  public function getDatabase()

  {

    if (\is_string($this->_database))

    {

      /* Call setter to convert to Database */

      $this->database = $this->_database;

    }

    return $this->_database;

  }

  /**

   * @param Database|string $value

   * @throws InvalidArgumentException

   */

  public function setDatabase ($value)

  {

        if ($value instanceof Database)

        {

                $this->_database = $value;

        }

        else if ($value !== null)

        {

                $database = new $value();

                if (!($database instanceof Database))

                {

                        throw new \InvalidArgumentException(

                                'Expected Database instance or string for class name, saw '

                                        . (\get_class($value) || \gettype($value))

                        );

                }

                $this->_database = $database;

        }

  }

  /**

   * Initiates a transaction

   *

   * @return bool

   * @see Database::beginTransaction()

   */

  public function beginTransaction()

  {

    return $this->_database->beginTransaction();

  }

  /**

   * Rolls back a transaction

   *

   * @return bool

   * @see Database::rollBack()

   */

  public function rollBack()

  {

    return $this->_database->rollBack();

  }

  /**

   * Commits a transaction

   *

   * @return bool

   * @see Database::commit()

   */

  public function commit()

  {

    return $this->_database->commit();

  }

  /**

   * Retrieves all rows from the table

   *

   * @return array

   * @see Database::fetchAll()

   */

  public function fetchAll($fetch_style = null, $column_index = null, array $ctor_args = null)

  {

    return $this->_database->fetchAll($this->_name, $fetch_style, $column_index, $ctor_args);

  }

  /**

   * Selects data from one or more tables

   *

   * @return array

   * @see Database::select()

   */

  public function select($columns = null, $where = null, $order = null, $limit = null)

  {

    return $this->_database->select($this->_name, $columns, $where, $order, $limit);

  }

  /**

   * Updates records in one or more tables

   *

   * @return bool

   * @see Database::update()

   */

  public function update($data, $condition)

  {

    return $this->_database->update($this->_name, $data, $condition);

  }

  /**

   * Inserts a record into the table

   *

   * @return bool

   * @see Database::insert()

   */

  public function insert($data, $cols = null)

  {

    return $this->_database->insert($this->_name, $data, $cols);

  }

  /**

   * Returns the ID of the last inserted row, or the last value from

   * a sequence object, depending on the underlying driver.

   *

   * @return int

   * @see Database::getLastInsertId()

   */

  public function getLastInsertId()

  {

    return $this->_database->lastInsertId;

  }

  /**

   * Delete a record from the table

   *

   * @param int $id

   *   ID of the record to delete.  May be <code>null</code>,

   *   in which case <var>$condition</var> must specify

   *   the records to be deleted.

   * @param array[optional] $condition

   *   Conditions that must be met for a record to be deleted.

   *   Ignored if <var>$id</var> is not <code>null</code>.

   * @return bool

   * @throws InvalidArgumentException if both <var>$id</var> and

   *     <var>$condition</var> are <code>null</code>.

   * @see Database::delete()

   */

  public function delete ($id, array $condition = null)

  {

    if ($id !== null)

    {

      $condition = array($this->_id => $id);

    }

    else if ($condition === null)

    {

      throw new InvalidArgumentException(

        '$id and $condition cannot both be null');

    }

    return $this->_database->delete($this->_name, $condition);

  }

 /**

  * Inserts a row into the table or updates an existing one

  *

  * @param array $data

  *   Associative array of column-value pairs to be updated/inserted

  * @param string|array $condition

  *   If there are no records matching this condition, a row will be inserted;

  *   otherwise matching records are updated

  * @return bool

  * @see Table::update()

  * @see Table::insert()

  */

  public function updateOrInsert($data, array $condition = null)

  {

    if ($this->select($this->_id, $condition))

    {

      return $this->update($data, $condition);

    }

        return $this->insert($data);

  }

  /**

   * Finds a record by ID

   *

   * @param mixed $id

   * @return array

   */

  public function find ($id)

  {

    /* DEBUG */

    if (defined('DEBUG') && DEBUG > 0)

    {

      debug($id);

    }

    $result = $this->select(null, array($this->_id => $id));

    if ($result)

    {

      $result = $result[0];

    }

    return $result;

  }

}