<?php

namespace App\Traits\Models;

use App\Models\SearchIndex;
use Illuminate\Database\Eloquent\SoftDeletes;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Str;
use Mcamara\LaravelLocalization\Facades\LaravelLocalization;

/**
 * If there is a static function in a trait (named boot[TraitName]),
 * it will be executed as the boot() function would on an Eloquent model.
 * Futhermore, event in the Model observer doesn't erase actual events in the model,
 * but adds them.
 */
trait HasMeilisearchIndex
{
    /**
     * Perform any actions required after the model boots.
     *
     * @return void
     */
    public static function bootHasMeilisearchIndex(): void
    {
        $keyPrefix       = Str::snake(class_basename(static::class));
        $usesSoftDeletes = in_array(SoftDeletes::class, class_uses_recursive(static::class));

        // Event executed avec saving a model.
        static::saved(function ($model) use ($keyPrefix, $usesSoftDeletes) {
            // Update ms index depending on status which is a global field non translatable.
            $statusChanged  = $model->wasChanged('status');
            $originalLocale = app()->getLocale();
            $locales        = $statusChanged
                ? array_keys(LaravelLocalization::getSupportedLocales())
                : [$originalLocale];

            // Loop on all locales to update indexes when global fields like status is updated,
            // Otherwise, on current locale.
            collect($locales)->map(function($locale) use ($keyPrefix, $model, $usesSoftDeletes) {
                // Set the locale to alter the right ms index.
                app()->setLocale($locale);

                $indexId = "{$keyPrefix}_{$model->getKey()}";

                // Remove model from meilisearch index.
                if ($usesSoftDeletes && method_exists($model, 'trashed') && $model->trashed()) {
                    SearchIndex::make([
                        'type'     => $keyPrefix,
                        'model_id' => $model->getKey(),
                    ])->unsearchable();
                    return;
                }
                $msIndex = $model->toSearchDocument();
                // Add model to the meilisearch index if conditions are true, remove from it if not.
                if ($msIndex) {
                    $msIndex->searchable();
                } else {
                    SearchIndex::make([
                        'type'     => $keyPrefix,
                        'model_id' => $model->getKey(),
                    ])->unsearchable();
                }
            });

            // Reset the locale with the original.
            app()->setLocale($originalLocale);
        });

        static::deleted(function ($model) use ($keyPrefix) {
            $originalLocale = app()->getLocale();
            $locales        = array_keys(LaravelLocalization::getSupportedLocales());

            // Loop on all locales to update indexes when model is deleted (softdeleted or not).
            collect($locales)->map(function($locale) use ($keyPrefix, $model) {
                // Set the locale to alter the right ms index.
                app()->setLocale($locale);

                $indexId = "{$keyPrefix}_{$model->getKey()}";
                // Remove model from meilisearch index.
                SearchIndex::make([
                    'type'     => $keyPrefix,
                    'model_id' => $model->getKey(),
                ])->unsearchable();
            });

            // Reset the locale with the original.
            app()->setLocale($originalLocale);
        });

        if ($usesSoftDeletes) {
            static::restored(function ($model) {
                $originalLocale = app()->getLocale();
                $locales        = array_keys(LaravelLocalization::getSupportedLocales());

                // Loop on all locales to update indexes when model is restored.
                collect($locales)->map(function($locale) use ($model) {
                    // Set the locale to alter the right ms index.
                    app()->setLocale($locale);

                    // Add model to the meilisearch index if conditions are true.
                    $msIndex = $model->toSearchDocument();
                    if ($msIndex) {
                        $msIndex->searchable();
                    }
                });

            // Reset the locale with the original.
                app()->setLocale($originalLocale);
            });
        }
    }
}