<?php

namespace App\Helpers;

use App\Enums\DynamicFieldTypes;
use Illuminate\Support\Str;
use Illuminate\Database\Eloquent\Model;
use Uwil\LaravelCommon\Helpers\FileHelper;

class DynamicPageHelper
{
    /**
     * Remove imgs from wysiwyg OR dynamic wysiwyg OR image input.
     *
     * @param \Illuminate\Database\Eloquent\Model $model
     * @param boolean                             $forceDeleteImage
     * In forceDelete event we need to ensure all the images will be destroyed
     * @return void
     */
    public static function removeImgs(Model $model, bool $forceDeleteImage = false): void
    {
        $locale = config('app.locale');
        $model  = $model->load('config');

        $currentContent  = json_decode($model->getAttributes()['content'], true);
        $originalContent = $model->getOriginal('content');

        if (isset($originalContent[$locale])) {
            $currentContentLocal  = is_array($currentContent[$locale])
                ? $currentContent[$locale]
                : ["text_" => $currentContent[$locale]];
            $originalContentLocal = is_array($originalContent[$locale])
                ? $originalContent[$locale]
                : ["text_" => $originalContent[$locale]];
            static::removeDynamicImages($model, $originalContentLocal, $currentContentLocal, $forceDeleteImage);
            static::removeWysiwygImages($originalContentLocal, $currentContentLocal);
        }
    }

    /**
     * Remove imgs from image inputs.
     *
     * @param \Illuminate\Database\Eloquent\Model $model
     * @param array                               $oldContent
     * @param array                               $newContent
     * @param boolean                             $forceDeleteImage
     * In forceDelete event we need to ensure all the images will be destroyed
     * @return void
     */
    protected static function removeDynamicImages(
        Model $model,
        array $oldContent,
        array $newContent,
        bool $forceDeleteImage
    ): void {
        $prefix  = DynamicFieldTypes::image->name . '_';
        $allKeys = static::getDynamicFieldKeys($oldContent, $newContent, $prefix);
        foreach ($allKeys as $key) {
            $old = $oldContent[$key] ?? null;
            $new = $newContent[$key] ?? null;

            // Case n°1 : Same values when force delete.
            if ((is_string($old) === is_string($new)) && $forceDeleteImage) {
                // We need to remove the actual file, not the old as we do in other conditions.
                FileHelper::removeFile($model, "content.$key");
            }

            // Case n°2: old = string, new = null → deletion.
            if (is_string($old) && is_null($new)) {
                // Remove the original file.
                FileHelper::removeOldFile($model, "content.$key");
                continue;
            }

            // Case n°3: old = null, new = string → addition.
            if (is_null($old) && is_string($new)) {
                // Nothing to do.
                continue;
            }

            // Case n°4: old = string, new = other string → replacement.
            if (is_string($old) && is_string($new) && $old !== $new) {
                FileHelper::removeOldFile($model, "content.$key");
                continue;
            }
        } //end foreach
    }

    /**
     * Remove imgs from wysiwygs.
     *
     * @param array $oldContent
     * @param array $newContent
     * @return void
     */
    protected static function removeWysiwygImages(array $oldContent, array $newContent): void
    {
        $prefix = DynamicFieldTypes::wysiwyg->name . '_';

        static::getDynamicFieldKeys($oldContent, $newContent, $prefix)
            ->each(function ($key) use ($oldContent) {
                $old = $oldContent[$key] ?? null;
                FileHelper::removeOldModelFilesFromHtml('', $old);
            });
    }

    /**
     * Get all value that correspond to a prefix in field input and group them.
     *
     * @param array  $oldContent
     * @param array  $newContent
     * @param string $prefix
     * @return \Illuminate\Support\Collection
     */
    protected static function getDynamicFieldKeys(
        array $oldContent,
        array $newContent,
        string $prefix
    ): \Illuminate\Support\Collection {
        $filter = fn($key, $prefix) => Str::startsWith($key, $prefix);
        $old    = collect($oldContent)->filter($filter);
        $new    = collect($newContent)->filter($filter);
        return $new->keys()->merge($old->keys())->unique();
    }
}