<?php

/**
 * @package   yii2-grid
 * @author    Kartik Visweswaran <kartikv2@gmail.com>
 * @copyright Copyright &copy; Kartik Visweswaran, Krajee.com, 2014 - 2015
 * @version   3.0.1
 */

namespace kartik\grid;

use Yii;
use Closure;
use yii\base\InvalidConfigException;
use yii\helpers\ArrayHelper;
use yii\helpers\Html;
use yii\helpers\Json;
use yii\web\View;

/**
 * RadioColumn displays a column of radio inputs in a grid view. It 
 * is different than the CheckboxColumn in the sense that it allows
 * only a single row to be selected at a time.
 *
 * @author Kartik Visweswaran <kartikv2@gmail.com>
 * @since 1.0
 */
class RadioColumn extends \yii\grid\Column
{
    use ColumnTrait;

    /**
     * @var string the name of the radio input fields.
     */
    public $name = 'kvradio';

    /**
     * @var bool whether to show the clear button in the header to clear the radio.
     */
    public $showClear = true;

    /**
     * @var array the HTML attributes for the clear button in the header. The following
     * special option is recognized:
     * - label: string, the label for the button (defaults to `&times;`);
     */
    public $clearOptions = ['class'=>'close'];
    
    /**
     * @var array|\Closure the HTML attributes for radio inputs. This can either be an array of
     * attributes or an anonymous function ([[Closure]]) that returns such an array.
     * The signature of the function should be the following: `function ($model, $key, $index, $column)`.
     * Where `$model`, `$key`, and `$index` refer to the model, key and index of the row currently being rendered
     * and `$column` is a reference to the [[RadioColumn]] object.
     * A function may be used to assign different attributes to different rows based on the data in that row.
     * Specifically if you want to set a different value for the radio, you can use this option in the 
     * following way (in this example using the `name` attribute of the model):
     *
     * ```php
     * 'radioOptions' => function($model, $key, $index, $column) {
     *     return ['value' => $model->name];
     * }
     * ```
     *
     * @see \yii\helpers\Html::renderTagAttributes() for details on how attributes are being rendered.
     */
    public $radioOptions = [];

    /**
     * @var boolean whether the column is hidden from display. This is different
     * than the `visible` property, in the sense, that the column is rendered,
     * but hidden from display. This will allow you to still export the column
     * using the export function.
     */
    public $hidden;

    /**
     * @var boolean|array whether the column is hidden in export output. If set to boolean `true`,
     * it will hide the column for all export formats. If set as an array, it will accept the
     * list of GridView export `formats` and hide output only for them.
     */
    public $hiddenFromExport = true;

    /**
     * @var string the horizontal alignment of each column. Should be one of
     * 'left', 'right', or 'center'.
     */
    public $hAlign = GridView::ALIGN_CENTER;

    /**
     * @var string the vertical alignment of each column. Should be one of
     * 'top', 'middle', or 'bottom'.
     */
    public $vAlign = GridView::ALIGN_MIDDLE;

    /**
     * @var boolean whether to force no wrapping on all table cells in the column
     * @see http://www.w3schools.com/cssref/pr_text_white-space.asp
     */
    public $noWrap = false;

    /**
     * @var string the width of each column (matches the CSS width property).
     * @see http://www.w3schools.com/cssref/pr_dim_width.asp
     */
    public $width = '50px';

    /**
     * @var boolean highlight current row if checkbox is checked
     */
    public $rowHighlight = true;

    /**
     * @var string highlight CSS class to be applied for highlighting the row.
     * Defaults to 'success'.
     */
    public $rowSelectedClass = GridView::TYPE_SUCCESS;

    /**
     * @var boolean|string whether the page summary is displayed above the footer for this column.
     * If this is set to a string, it will be displayed as is. If it is set to `false` the summary
     * will not be displayed.
     */
    public $pageSummary = false;

    /**
     * @var array HTML attributes for the page summary cell
     */
    public $pageSummaryOptions = [];

    /**
     * @var boolean whether to just hide the page summary display but still calculate
     * the summary based on `pageSummary` settings
     */
    public $hidePageSummary = false;

    /**
     * @var boolean whether to merge the header title row and the filter row
     * This will not render the filter for the column and can be used when `filter`
     * is set to `false`. Defaults to `false`. This is only applicable when `filterPosition`
     * for the grid is set to FILTER_POS_BODY.
     */
    public $mergeHeader = true;
    
    /**
     * @var string the variables for the client script
     */
    protected $_clientVars = '';

    /**
     * @var string the client script
     */
    protected $_clientScript = '';
    
    /**
     * @var View the widget view object instance
     */
    protected $_view;
    
    /**
     * @inheritdoc
     */
    public function init()
    {
        if (empty($this->name)) {
            throw new InvalidConfigException('The "name" property must be set.');
        }
        $css = $this->rowHighlight ? $this->rowSelectedClass : '';
        $this->_view = $this->grid->getView();
        RadioColumnAsset::register($this->_view);
        $grid = $this->grid->options['id'];
        $this->_clientVars = "'{$grid}', '{$this->name}', '{$css}'";
        $this->_clientScript = "kvSelectRadio({$this->_clientVars});";
        $this->_view->registerJs($this->_clientScript);
        $this->parseFormat();
        $this->parseVisibility();
        parent::init();
        $this->setPageRows();
    }

    /**
     * @inheritdoc
     */
    protected function renderHeaderCellContent()
    {
        if ($this->header !== null || !$this->showClear) {
            return parent::renderHeaderCellContent();
        } else {
            $label = ArrayHelper::remove($this->clearOptions, 'label', '&times;');
            Html::addCssClass($this->clearOptions, 'kv-clear-radio');
            if (empty($this->clearOptions['title'])) {
                $this->clearOptions['title'] = Yii::t('kvgrid', 'Clear selection');
            }
            $this->_view->registerJs("kvClearRadio({$this->_clientVars});");
            return Html::button($label, $this->clearOptions);
        }
    }

    /**
     * @inheritdoc
     */
    public function renderDataCell($model, $key, $index)
    {
        $this->initPjax($this->_clientScript);
        $options = $this->fetchContentOptions($model, $key, $index);
        Html::addCssClass($options, 'kv-row-radio-select');
        return Html::tag('td', $this->renderDataCellContent($model, $key, $index), $options);
    }

    /**
     * @inheritdoc
     */
    protected function renderDataCellContent($model, $key, $index)
    {
        if ($this->radioOptions instanceof Closure) {
            $options = call_user_func($this->radioOptions, $model, $key, $index, $this);
        } else {
            $options = $this->radioOptions;
            if (!isset($options['value'])) {
                $options['value'] = is_array($key) ? Json::encode($key) : $key;
            }
        }
        return Html::radio($this->name, !empty($options['checked']), $options);
    }    
}