<?php

namespace bff\view;

use Cache;
use ReflectionMethod;
use bff\extend\theme\Form;

/**
 * Stores blocks settings
 * @copyright Tamaranga
 */
trait StoresSettings
{
    /**
     * Settings form
     * @var Form
     */
    protected $settingsForm;

    /**
     * @var Page
     */
    public $settingsFormPage;

    /**
     * Settings data
     * @var array
     */
    protected $settingsData;

    /**
     * @var bool
     */
    protected $settingsFillAllowed = true;

    /**
     * Init block (and sub blocks) settings form
     * @param Form $form
     * @return void
     */
    public function initSettingsForm($form)
    {
        $this->settingsForm = $form;

        $iteratorRecursive = static function ($block) use (&$iteratorRecursive, $form) {
            /** @var Block $block */
            $reflector = new ReflectionMethod($block, 'settingsForm');
            if (! $block->noSettings(null) && $reflector->getDeclaringClass()->getName() !== Block::class) {
                $block->settingsFormTab($form);
                $block->settingsForm($form);
            }
            $block->rotationSettingsForm($form);
            $block->blocksIterator($iteratorRecursive);
        };

        $this->settingsFillAllowed(false);
        $iteratorRecursive($this);
        $this->settingsFillAllowed(true);
    }

    /**
     * Manage settings fill allowed
     * @return bool
     */
    public function settingsFillAllowed(?bool $allow = null)
    {
        if (! is_null($allow)) {
            $this->settingsFillAllowed = $allow;
            if ($this->settingsFormPage && $this->settingsFormPage !== $this) {
                $this->settingsFormPage->settingsFillAllowed($allow);
            }
        }

        return $this->settingsFillAllowed;
    }

    /**
     * Get block settings form instance
     * @return Form|null
     */
    public function getSettingsForm()
    {
        if (! is_null($this->settingsForm)) {
            return $this->settingsForm;
        }

        $page = $this->getParentPage();
        if (! $page) {
            return null;
        }
        $page = $page->getAliasFor() ?? $page;

        return $this->app->theme()->getPageSettingsForm($page, $this->settingsFormPage);
    }

    /**
     * Get block settings by key
     * @param string $key
     * @return mixed|null
     */
    public function getBlockSettings($key)
    {
        if (is_array($this->settingsData)) {
            return $this->settingsData[$key] ?? null;
        }

        return null;
    }

    /**
     * Load settings & cache
     * @param string|null $lang
     */
    public function loadSettings(?string $lang = null)
    {
        if (! is_null($this->settingsData)) {
            return;
        }
        $cacheKey = $this->settingsCacheKey($lang);

        $this->settingsData = Cache::rememberForever($cacheKey, function () {
            $data = [];

            # Save blocks state to revert after building settings form & cache data
            $blocks = $this->blocks;

            $form = $this->getSettingsForm();
            if ($form) {
                $iteratorRecursive = static function ($block) use (&$iteratorRecursive, $form, &$data) {
                    /** @var Block $block */
                    $key = $block->getKey();
                    $reflector = new ReflectionMethod($block, 'settingsForm');
                    if ($reflector->getDeclaringClass()->getName() !== Block::class) {
                        $block->settingsFormTab($form);
                        $data[$key] = array_merge($data[$key] ?? [], $form->getActiveTabValues());
                    }
                    $rotation = $block->rotationSettingsValues($form);
                    if (! empty($rotation)) {
                        $data[$key] = array_merge($data[$key] ?? [], $rotation);
                    }
                    $block->blocksIterator($iteratorRecursive);
                };
                $this->settingsFillAllowed(false);
                $iteratorRecursive($this);
                $this->settingsFillAllowed(true);
            }

            $this->blocks = $blocks;

            return $data;
        });

        # json to array
        if (is_string($this->settingsData)) {
            $this->settingsData = json_decode($this->settingsData, true);
            $toArray = true;
        }
        if (! is_array($this->settingsData)) {
            $this->settingsData = [];
            $toArray = true;
        }
        if (isset($toArray)) {
            Cache::forever($cacheKey, $this->settingsData);
        }
        if ($this->settingsFormPage && $this->settingsFormPage !== $this) {
            $this->settingsFormPage->loadSettings($lang);
        }
    }

    /**
     * Get settings cache key
     * @param string|null $lang
     * @return string
     */
    protected function settingsCacheKey(?string $lang = null)
    {
        return 'view.settings.' . $this->getKey() . '.' . ($lang ?? $this->locale->current());
    }

    /**
     * Reset settings cache
     */
    public function settingsCacheReset()
    {
        foreach ($this->locale->getLanguages() as $lang) {
            Cache::forget($this->settingsCacheKey($lang));
        }
    }
}