<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\grid;

use yii\base\Model;
use yii\data\ActiveDataProvider;
use yii\db\ActiveQuery;
use yii\helpers\ArrayHelper;
use yii\helpers\Html;
use yii\helpers\Inflector;

/**
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class DataColumn extends Column
{
	/**
	 * @var string the attribute name associated with this column. When neither [[content]] nor [[value]]
	 * is specified, the value of the specified attribute will be retrieved from each data model and displayed.
	 *
	 * Also, if [[header]] is not specified, the label associated with the attribute will be displayed.
	 */
	public $attribute;
	/**
	 * @var \Closure an anonymous function that returns the value to be displayed for every data model.
	 * If this is not set, `$model[$attribute]` will be used to obtain the value.
	 */
	public $value;
	/**
	 * @var string in which format should the value of each data model be displayed as (e.g. "text", "html").
	 * Supported formats are determined by the [[GridView::formatter|formatter]] used by the [[GridView]].
	 * Default format is "text" which will format the value as an HTML-encoded plain text when
	 * [[\yii\base\Formatter]] or [[\yii\i18n\Formatter]] is used.
	 */
	public $format = 'text';
	/**
	 * @var boolean whether to allow sorting by this column. If true and [[attribute]] is found in
	 * the sort definition of [[GridView::dataProvider]], then the header cell of this column
	 * will contain a link that may trigger the sorting when being clicked.
	 */
	public $enableSorting = true;
	/**
	 * @var string|array|boolean the HTML code representing a filter input (e.g. a text field, a dropdown list)
	 * that is used for this data column. This property is effective only when [[GridView::filterModel]] is set.
	 *
	 * - If this property is not set, a text field will be generated as the filter input;
	 * - If this property is an array, a dropdown list will be generated that uses this property value as
	 *   the list options.
	 * - If you don't want a filter for this data column, set this value to be false.
	 */
	public $filter;


	protected function renderHeaderCellContent()
	{
		$provider = $this->grid->dataProvider;
		if ($this->attribute !== null && $this->enableSorting &&
			($sort = $provider->getSort()) !== false && $sort->hasAttribute($this->attribute)) {

			$label = $this->getHeaderLabel();
			if (($this->header !== null || !isset($sort->attributes[$this->attribute]['label'])) && trim($label) !== '') {
				$sort->attributes[$this->attribute]['label'] = $label;
			}
			return $sort->link($this->attribute);
		} elseif ($this->header === null) {
			return $this->getHeaderLabel();
		} else {
			return parent::renderHeaderCellContent();
		}
	}

	protected function getHeaderLabel()
	{
		$provider = $this->grid->dataProvider;
		if ($this->header !== null) {
			return $this->header;
		}
		if ($provider instanceof ActiveDataProvider && $provider->query instanceof ActiveQuery) {
			/** @var Model $model */
			$model = new $provider->query->modelClass;
			return $model->getAttributeLabel($this->attribute);
		}
		$models = $provider->getModels();
		if (($model = reset($models)) instanceof Model) {
			/** @var Model $model */
			return $model->getAttributeLabel($this->attribute);
		}
		return Inflector::camel2words($this->attribute);
	}

	protected function renderFilterCellContent()
	{
		if (is_string($this->filter)) {
			return $this->filter;
		} elseif ($this->filter !== false && $this->grid->filterModel instanceof Model && $this->attribute !== null) {
			if (is_array($this->filter)) {
				return Html::activeDropDownList($this->grid->filterModel, $this->attribute, $this->filter, array('prompt' => ''));
			} else {
				return Html::activeTextInput($this->grid->filterModel, $this->attribute);
			}
		} else {
			return parent::renderFilterCellContent();
		}
	}

	protected function renderDataCellContent($model, $index)
	{
		if ($this->value !== null) {
			$value = call_user_func($this->value, $model, $index, $this);
		} elseif ($this->content === null && $this->attribute !== null) {
			$value = ArrayHelper::getValue($model, $this->attribute);
		} else {
			return parent::renderDataCellContent($model, $index);
		}
		return $this->grid->formatter->format($value, $this->format);
	}
}