<?php

namespace App\Services\StaticPage;

use App\Lib\Helpers\FileStorageHelper;
use App\Models\SectionPage;
use App\Models\StaticPage;
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Http\UploadedFile;

class SectionPageService
{
    /**
     * Retrieve all sections for a given page.
     *
     * @param  bool  $onlyVisible  If true, returns only visible sections
     */
    public function getByPage(StaticPage $page, bool $onlyVisible = false): Collection
    {
        $query = $page->sections();

        if ($onlyVisible) {
            $query->where('visibility', true);
        }

        return $query->get();
    }

    /**
     * Update an existing section.
     * Handles uploaded file storage and data merging.
     */
    public function update(SectionPage $section, array $data): SectionPage
    {
        if (isset($data['data'])) {
            array_walk_recursive($data['data'], function (&$value) use ($section) {
                if ($value instanceof UploadedFile) {
                    $value = FileStorageHelper::storeFile($section->page, $value);
                }
            });
        }

        $section->update([
            'name'       => $data['name']       ?? $section->name,
            'visibility' => $data['visibility'] ?? $section->visibility,
            'data'       => $this->mergeData((array) json_decode(json_encode($section->data), true), $data['data'] ?? []),
        ]);

        return $section->fresh();
    }

    /**
     * Merge original data with new data.
     * Performs a recursive merge for nested arrays.
     *
     * @param  array  $original  Current section data
     * @param  array  $new  New data to merge
     */
    private function mergeData(array $original, array $new): array
    {
        foreach ($new as $key => $field) {
            if (isset($original[$key]) && is_array($original[$key]) && is_array($field)) {
                $original[$key] = $this->deepMerge($original[$key], $field);
            } else {
                $original[$key] = $field;
            }
        }

        return $original;
    }

    /**
     * Deep merge two arrays.
     * If a video is provided, clears the existing picture and vice versa.
     *
     * @param  array  $original  Original array
     * @param  array  $new  Array to merge into the original
     */
    private function deepMerge(array $original, array $new): array
    {
        if (isset($new['video'])) {
            $original['picture'] = null;
        } elseif (isset($new['picture'])) {
            $original['video'] = null;
        }

        foreach ($new as $key => $field) {
            if (isset($original[$key]) && is_array($original[$key]) && is_array($field)) {
                $original[$key] = $this->deepMerge($original[$key], $field);
            } else {
                $original[$key] = $field;
            }
        }

        return $original;
    }

    /**
     * Toggle the visibility of a section.
     */
    public function toggleVisibility(SectionPage $section): SectionPage
    {
        $section->update([
            'visibility' => ! $section->visibility,
        ]);

        return $section->fresh();
    }
}