<?php namespace Backend\FormWidgets;

use Event;
use Request;
use Backend\Classes\FormWidgetBase;

/**
 * Rich Editor
 * Renders a rich content editor field.
 *
 * @package october\backend
 * @author Alexey Bobkov, Samuel Georges
 */
class RichEditor extends FormWidgetBase
{
    //
    // Configurable properties
    //

    /**
     * @var boolean Determines whether content has HEAD and HTML tags.
     */
    public $fullPage = false;

    //
    // Object properties
    //

    /**
     * {@inheritDoc}
     */
    protected $defaultAlias = 'richeditor';

    /**
     * {@inheritDoc}
     */
    public function init()
    {
        $this->fillFromConfig([
            'fullPage',
        ]);
    }

    /**
     * {@inheritDoc}
     */
    public function render()
    {
        $this->prepareVars();
        return $this->makePartial('richeditor');
    }

    /**
     * Prepares the list data
     */
    public function prepareVars()
    {
        $this->vars['fullPage'] = $this->fullPage;
        $this->vars['stretch'] = $this->formField->stretch;
        $this->vars['size'] = $this->formField->size;
        $this->vars['name'] = $this->formField->getName();
        $this->vars['value'] = $this->getLoadValue();
    }

    /**
     * Returns a single collection of available page links.
     * This implementation has room to place links under
     * different groups based on the link type.
     * @return array
     */
    public function onGetPageLinks()
    {
        $links = [];
        $types = $this->getPageLinkTypes();

        $links[] = ['name' => 'Select a page...', 'url' => false];

        $iterator = function($links, $level = 0) use (&$iterator) {
            $result = [];
            foreach ($links as $linkUrl => $link) {

                /*
                 * Remove scheme and host from URL
                 */
                $baseUrl = Request::getSchemeAndHttpHost();
                if (strpos($linkUrl, $baseUrl) === 0) {
                    $linkUrl = substr($linkUrl, strlen($baseUrl));
                }

                $linkName = str_repeat('&nbsp;', $level * 4);
                $linkName .= is_array($link) ? array_get($link, 'title', '') : $link;
                $result[] = ['name' => $linkName, 'url' => $linkUrl];

                if (is_array($link)) {
                    $result = array_merge(
                        $result,
                        $iterator(array_get($link, 'links', []), $level + 1)
                    );
                }
            }

            return $result;
        };

        foreach ($types as $typeCode => $typeName) {
            $links = array_merge($links, $iterator($this->getPageLinks($typeCode)));
        }

        return ['links' => $links];
    }

    /**
     * {@inheritDoc}
     */
    public function loadAssets()
    {
        $this->addCss('css/richeditor.css', 'core');
        $this->addJs('js/build-min.js', 'core');
    }

    /**
     * Returns a list of registered page link types.
     * This is reserved functionality for separating the links by type.
     * @return array Returns an array of registered page link types
     */
    protected function getPageLinkTypes()
    {
        $result = [];

        $apiResult = Event::fire('backend.richeditor.listTypes');
        if (is_array($apiResult)) {
            foreach ($apiResult as $typeList) {
                if (!is_array($typeList)) {
                    continue;
                }

                foreach ($typeList as $typeCode => $typeName) {
                    $result[$typeCode] = $typeName;
                }
            }
        }

        return $result;
    }

    protected function getPageLinks($type)
    {
        $result = [];
        $apiResult = Event::fire('backend.richeditor.getTypeInfo', [$type]);
        if (is_array($apiResult)) {
            foreach ($apiResult as $typeInfo) {
                if (!is_array($typeInfo)) {
                    continue;
                }

                foreach ($typeInfo as $name => $value) {
                    $result[$name] = $value;
                }
            }
        }

        return $result;
    }
}