<?php
namespace App\Helpers;

use App\Models\WidgetArea;

class WidgetAreas
{
    /**
     * @var array list of inicialized widget areas
     */
    protected static $widgetAreas = [];
    protected static $initialized = false;

    protected static function saveRenderedWidgetArea($widgets)
    {
        foreach ($widgets as $widget) {
            if (!isset(self::$widgetAreas[$widget->widget_area_code]))
                self::$widgetAreas[$widget->widget_area_code] = '';

            $handler = $widget->widget_type_handler;
            $widget->settings = json_decode($widget->settings);
            $presenter = call_user_func([$handler, 'getPresenter']);

            self::$widgetAreas[$widget->widget_area_code] .= call_user_func([$presenter, 'render'], $widget);
        }
    }

    protected static function loadWidgetArea($uniqueCode)
    {
        $widgetArea = new WidgetArea();
        $widgets = $widgetArea->getWidgets($uniqueCode)
                              ->get();

        WidgetArea::where('code', $uniqueCode)
                  ->increment('viewed');

        self::saveRenderedWidgetArea($widgets);
    }

    protected static function initWidgetAreas()
    {
        if (self::$initialized)
            return;

        $widgetArea = new WidgetArea();
        $widgets = $widgetArea->getWidgets()
                              ->get();

        self::saveRenderedWidgetArea($widgets);
        self::$initialized = true;
    }

    /**
     * Renderer for whole widget area.
     *
     * @param $uniqueCode
     *
     * @return mixed
     */
    public static function render($uniqueCode)
    {
        if (!self::$initialized) {
            self::initWidgetAreas();
        }

        if (!isset(self::$widgetAreas[$uniqueCode])) {
            self::loadWidgetArea($uniqueCode);
        }

        echo self::$widgetAreas[$uniqueCode];
    }
}