<?php
namespace yiiexts\kindeditor;

use Yii;
use yii\helpers\Html;
use yii\helpers\ArrayHelper;
use yii\widgets\InputWidget;

/**
 * Class Kindeditor
 * @package yiiexts\kindeditor
 */
class Kindeditor extends InputWidget
{
    /**
     * default options.
     */
    private $_options = [
        'id' => 'editor',
    ];

    /**
     * default editor options.
     */
    private $_editorOptions = [
        'width' => '100%',
        'height' => '480',
        'items' => [
            'source', '|', 'undo', 'redo', '|', 'preview', 'print', 'template', 'code', 'cut', 'copy', 'paste',
            'plainpaste', 'wordpaste', '|', 'justifyleft', 'justifycenter', 'justifyright',
            'justifyfull', 'insertorderedlist', 'insertunorderedlist', 'indent', 'outdent', 'subscript',
            'superscript', 'clearhtml', 'quickformat', 'selectall', '|', 'fullscreen', '/',
            'formatblock', 'fontname', 'fontsize', '|', 'forecolor', 'hilitecolor', 'bold',
            'italic', 'underline', 'strikethrough', 'lineheight', 'removeformat', '|', 'image',
            'flash', 'media', 'insertfile', 'table', 'hr', 'emoticons', 'baidumap', 'pagebreak',
            'anchor', 'link', 'unlink', '|', 'about'
        ],
        'allowImageUpload' => false,
        'allowFlashUpload' => false,
        'allowMediaUpload' => false,
        'allowFileUpload' => false,
        'allowFileManager' => false,
        'filePostName' => 'file',
    ];

    /**
     * editor options
     * @var array
     */
    public $editorOptions = [];

    /**
     * renders the widget.
     */
    public function run()
    {
        $this->options = ArrayHelper::merge($this->_options, $this->options);

        echo $this->renderWidget();

        $this->registerAssets();
    }

    private function registerAssets()
    {
        KindeditorAsset::register($this->getView());
        $this->getView()->registerJs($this->initJs());
    }

    private function renderWidget()
    {
        if ($this->hasModel()) {
            return Html::activeTextarea($this->model, $this->attribute, $this->options);
        } else {
            return Html::textarea($this->name, $this->value, $this->options);
        }
    }

    /**
     * @return string the editor initial javascript.
     */
    private function initJs()
    {
        $options = $this->initEditorOptions();

        $optionsJSON = json_encode($options);

        return <<<EOL
KindEditor.ready(function(K) {
    window.editor = K.create('#{$this->options['id']}', $optionsJSON);
});
EOL;
    }

    /**
     * @return array
     */
    private function initEditorOptions()
    {
        $options = ArrayHelper::merge($this->_editorOptions, $this->editorOptions);

        if (Yii::$app->getRequest()->enableCsrfValidation && $this->isAllowUpload($options)) {
            $options['extraFileUploadParams'] = ArrayHelper::merge(
                isset($options['extraFileUploadParams']) ? $options['extraFileUploadParams'] : [],
                [Yii::$app->getRequest()->csrfParam => Yii::$app->getRequest()->csrfToken]
            );
        }

        return $options;
    }

    /**
     * @param $options
     * @return bool indicate whether allow upload.
     */
    private function isAllowUpload($options)
    {
        $uploadOptions = ['allowImageUpload', 'allowFlashUpload', 'allowMediaUpload', 'allowFileUpload'];
        foreach ($uploadOptions as $option) {
            if (isset($options[$option]) && $options[$option]) {
                return true;
            }
        }

        return false;
    }
}