<?php

namespace App\Providers;

use Illuminate\Cache\RateLimiting\Limit;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\RateLimiter;
use Illuminate\Support\ServiceProvider;
use App\Models\Artwork;
use App\Models\ArtworkAward;
use App\Models\ArtworkComment;
use App\Models\ArtworkFavourite;
use App\Models\ArtworkReaction;
use App\Observers\ArtworkAwardObserver;
use App\Observers\ArtworkCommentObserver;
use App\Observers\ArtworkFavouriteObserver;
use App\Observers\ArtworkObserver;
use App\Observers\ArtworkReactionObserver;
use App\Services\Upload\Contracts\UploadDraftServiceInterface;
use App\Services\Upload\UploadDraftService;
use Illuminate\Support\Facades\View;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Event;
use Illuminate\Support\Facades\Log;
use Illuminate\Queue\Events\JobFailed;
use App\Services\ReceivedCommentsInboxService;
use Klevze\ControlPanel\Framework\Core\Menu;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Register any application services.
     */
    public function register(): void
    {
        $this->app->singleton(
            \App\Services\Countries\CountryRemoteProviderInterface::class,
            \App\Services\Countries\CountryRemoteProvider::class,
        );

        // Bind UploadDraftService interface to implementation
        $this->app->singleton(UploadDraftServiceInterface::class, function ($app) {
            return new UploadDraftService($app->make('filesystem'));
        });

        // Bind vector adapter interface for similarity system (resolves via factory)
        $this->app->bind(
            \App\Services\Recommendations\VectorSimilarity\VectorAdapterInterface::class,
            fn () => \App\Services\Recommendations\VectorSimilarity\VectorAdapterFactory::make(),
        );

        // EGS: bind SpotlightEngineInterface to the concrete SpotlightEngine
        $this->app->singleton(
            \App\Services\EarlyGrowth\SpotlightEngineInterface::class,
            \App\Services\EarlyGrowth\SpotlightEngine::class,
        );
    }

    /**
     * Bootstrap any application services.
     */
    public function boot(): void
    {
        $this->registerCpadMenuItems();

        // Map the 'legacy' view namespace to resources/views/_legacy so all
        // view('legacy::foo') and @include('legacy::foo') calls resolve correctly
        // after the folder was renamed from legacy/ to _legacy/.
        View::addNamespace('legacy', resource_path('views/_legacy'));

        $this->configureAuthRateLimiters();
        $this->configureUploadRateLimiters();
        $this->configureMessagingRateLimiters();
        $this->configureDownloadRateLimiter();
        $this->configureArtworkRateLimiters();
        $this->configureReactionRateLimiters();
        $this->configureSocialRateLimiters();
        $this->configureSettingsRateLimiters();
        $this->configureMailFailureLogging();

        ArtworkAward::observe(ArtworkAwardObserver::class);
        Artwork::observe(ArtworkObserver::class);
        ArtworkFavourite::observe(ArtworkFavouriteObserver::class);
        ArtworkComment::observe(ArtworkCommentObserver::class);
        ArtworkReaction::observe(ArtworkReactionObserver::class);

        // ── OAuth / SocialiteProviders ──────────────────────────────────────
        Event::listen(
            \SocialiteProviders\Manager\SocialiteWasCalled::class,
            \SocialiteProviders\Discord\DiscordExtendSocialite::class,
        );
        // Apple provider removed — no listener registered

        // ── Posts / Feed System Events ──────────────────────────────────────
        Event::listen(
            \App\Events\Posts\ArtworkShared::class,
            \App\Listeners\Posts\SendArtworkSharedNotification::class,
        );
        Event::listen(
            \App\Events\Posts\PostCommented::class,
            \App\Listeners\Posts\SendPostCommentedNotification::class,
        );
        Event::listen(
            \App\Events\Posts\PostCommented::class,
            \App\Listeners\Posts\AwardXpForPostCommented::class,
        );
        Event::listen(
            \App\Events\Achievements\AchievementCheckRequested::class,
            \App\Listeners\Achievements\CheckUserAchievements::class,
        );
        Event::listen(
            \App\Events\Achievements\UserXpUpdated::class,
            \App\Listeners\Achievements\CheckUserAchievements::class,
        );

        // Provide toolbar counts and user info to layout views (port of legacy toolbar logic)
        View::composer(['layouts.nova', 'layouts.nova.*'], function ($view) {
            $uploadCount = $favCount = $msgCount = $noticeCount = $receivedCommentsCount = 0;
            $avatarHash = null;
            $displayName = null;
            $userId = null;

            if (Auth::check()) {
                $userId = Auth::id();
                try {
                    $uploadCount = DB::table('artworks')->where('user_id', $userId)->count();
                } catch (\Throwable $e) {
                    $uploadCount = 0;
                }

                try {
                    $favCount = DB::table('artwork_favourites')->where('user_id', $userId)->count();
                } catch (\Throwable $e) {
                    $favCount = 0;
                }

                try {
                    $msgCount = (int) DB::table('conversation_participants as cp')
                        ->join('messages as m', 'm.conversation_id', '=', 'cp.conversation_id')
                        ->where('cp.user_id', $userId)
                        ->whereNull('cp.left_at')
                        ->whereNull('m.deleted_at')
                        ->where('m.sender_id', '!=', $userId)
                        ->where(function ($q) {
                            $q->whereNull('cp.last_read_at')
                                ->orWhereColumn('m.created_at', '>', 'cp.last_read_at');
                        })
                        ->count();
                } catch (\Throwable $e) {
                    $msgCount = 0;
                }

                try {
                    $noticeCount = DB::table('notifications')->where('user_id', $userId)->whereNull('read_at')->count();
                } catch (\Throwable $e) {
                    $noticeCount = 0;
                }

                try {
                    $receivedCommentsCount = $this->app->make(ReceivedCommentsInboxService::class)
                        ->unreadCountForUser(Auth::user());
                } catch (\Throwable $e) {
                    $receivedCommentsCount = 0;
                }

                try {
                    $profile = DB::table('user_profiles')->where('user_id', $userId)->first();
                    $avatarHash = $profile->avatar_hash ?? null;
                } catch (\Throwable $e) {
                    $avatarHash = null;
                }

                $displayName = Auth::user()->name ?: (Auth::user()->username ?? '');
            }

            $view->with(compact('userId','uploadCount', 'favCount', 'msgCount', 'noticeCount', 'receivedCommentsCount', 'avatarHash', 'displayName'));
        });

        // Replace the framework HandleCors with our ConditionalCors so the
        // CP_ENABLE_CORS / config('cors.paths') toggle takes effect.
        try {
            $middlewareConfig = $this->app->make(\Illuminate\Foundation\Configuration\Middleware::class);
            $middlewareConfig->replace(
                \Illuminate\Http\Middleware\HandleCors::class,
                \App\Http\Middleware\ConditionalCors::class
            );
        } catch (\Throwable $_) {
            // Fallback: push to kernel if replace isn't available in this app instance
            $this->app->make(\Illuminate\Contracts\Http\Kernel::class)
                ->pushMiddleware(\App\Http\Middleware\ConditionalCors::class);
        }
    }

    private function configureAuthRateLimiters(): void
    {
        RateLimiter::for('register-ip', function (Request $request): Limit {
            $limit = max(1, (int) config('registration.ip_per_minute_limit', 3));

            return Limit::perMinute($limit)->by('register:ip:' . $request->ip());
        });

        RateLimiter::for('register-ip-daily', function (Request $request): Limit {
            $limit = max(1, (int) config('registration.ip_per_day_limit', 20));

            return Limit::perDay($limit)->by('register:ip:daily:' . $request->ip());
        });

        RateLimiter::for('register', function (Request $request): array {
            $emailKey = strtolower((string) $request->input('email', 'unknown'));
            $ipLimit = (int) config('registration.ip_per_minute_limit', 3);
            $emailLimit = (int) config('registration.email_per_minute_limit', 6);

            return [
                Limit::perMinute($ipLimit)->by('register:ip:' . $request->ip()),
                Limit::perMinute($emailLimit)->by('register:email:' . $emailKey),
            ];
        });
    }

    private function configureMailFailureLogging(): void
    {
        Event::listen(JobFailed::class, function (JobFailed $event): void {
            if (! str_contains(strtolower($event->job->resolveName()), 'sendqueuedmailable')) {
                return;
            }

            Log::warning('mail delivery failed', [
                'transport' => config('mail.default'),
                'job_name' => $event->job->resolveName(),
                'queue' => $event->job->getQueue(),
                'connection' => $event->connectionName,
                'exception' => $event->exception->getMessage(),
            ]);
        });
    }

    private function configureUploadRateLimiters(): void
    {
        RateLimiter::for('uploads-init', function (Request $request): array {
            return $this->buildUploadLimits($request, 'init');
        });

        RateLimiter::for('uploads-finish', function (Request $request): array {
            return $this->buildUploadLimits($request, 'finish');
        });

        RateLimiter::for('uploads-status', function (Request $request): array {
            return $this->buildUploadLimits($request, 'status');
        });
    }

    private function buildUploadLimits(Request $request, string $key): array
    {
        $config = (array) config('uploads.rate_limits.' . $key, []);
        $decay = (int) config('uploads.rate_limits.decay_minutes', 1);
        $perUser = (int) ($config['per_user'] ?? 0);
        $perIp = (int) ($config['per_ip'] ?? 0);

        $limits = [];

        if ($perUser > 0) {
            $userId = $request->user()?->id ?? 'guest';
            $limits[] = Limit::perMinutes($decay, $perUser)->by('u:' . $userId);
        }

        if ($perIp > 0) {
            $limits[] = Limit::perMinutes($decay, $perIp)->by('ip:' . $request->ip());
        }

        return $limits;
    }

    private function configureMessagingRateLimiters(): void
    {
        RateLimiter::for('messages-send', function (Request $request): array {
            $userId = $request->user()?->id ?? 'guest';

            return [
                Limit::perMinute(20)->by('messages:user:' . $userId),
                Limit::perMinute(40)->by('messages:ip:' . $request->ip()),
            ];
        });

        RateLimiter::for('messages-react', function (Request $request): array {
            $userId = $request->user()?->id ?? 'guest';

            return [
                Limit::perMinute(60)->by('messages:react:user:' . $userId),
                Limit::perMinute(120)->by('messages:react:ip:' . $request->ip()),
            ];
        });

        RateLimiter::for('messages-read', function (Request $request): array {
            $userId = $request->user()?->id ?? 'guest';

            return [
                Limit::perMinute(120)->by('messages:read:user:' . $userId),
                Limit::perMinute(240)->by('messages:read:ip:' . $request->ip()),
            ];
        });

        RateLimiter::for('messages-typing', function (Request $request): array {
            $userId = $request->user()?->id ?? 'guest';
            $conversationId = (int) $request->route('conversation_id');

            return [
                Limit::perMinute(90)->by('messages:typing:user:' . $userId . ':conv:' . $conversationId),
                Limit::perMinute(180)->by('messages:typing:ip:' . $request->ip()),
            ];
        });

        RateLimiter::for('messages-recovery', function (Request $request): array {
            $userId = $request->user()?->id ?? 'guest';
            $conversationId = (int) $request->route('conversation_id');

            return [
                Limit::perMinute(30)->by('messages:recovery:user:' . $userId . ':conv:' . $conversationId),
                Limit::perMinute(60)->by('messages:recovery:ip:' . $request->ip()),
            ];
        });

        RateLimiter::for('messages-presence', function (Request $request): array {
            $userId = $request->user()?->id ?? 'guest';

            return [
                Limit::perMinute(180)->by('messages:presence:user:' . $userId),
                Limit::perMinute(300)->by('messages:presence:ip:' . $request->ip()),
            ];
        });
    }

    private function configureDownloadRateLimiter(): void
    {
        RateLimiter::for('downloads', function (Request $request): array {
            $userId = $request->user()?->id;

            // Higher user-based allowance prevents false positives for active users,
            // while IP limit still protects guest endpoints from bursts.
            return [
                Limit::perMinute(60)->by('downloads:user:' . ($userId ?? 'guest')),
                Limit::perMinute(120)->by('downloads:ip:' . $request->ip()),
            ];
        });
    }

    private function configureArtworkRateLimiters(): void
    {
        RateLimiter::for('artwork-awards', function (Request $request): array {
            $userId = $request->user()?->id;
            $artworkId = (int) $request->route('id');

            return [
                // Prevent burst spam on a single artwork while allowing normal exploration.
                Limit::perMinute(20)->by('awards:user:' . ($userId ?? 'guest') . ':art:' . $artworkId),
                // Global safety net for user/IP across all artworks.
                Limit::perMinute(120)->by('awards:user:' . ($userId ?? 'guest')),
                Limit::perMinute(180)->by('awards:ip:' . $request->ip()),
            ];
        });
    }

    private function configureReactionRateLimiters(): void
    {
        RateLimiter::for('reactions-read', function (Request $request): array {
            $userId = $request->user()?->id;

            return [
                // Comment-heavy pages can trigger many reaction reads at once.
                Limit::perMinute(600)->by('reactions-read:user:' . ($userId ?? 'guest')),
                Limit::perMinute(900)->by('reactions-read:ip:' . $request->ip()),
            ];
        });

        RateLimiter::for('reactions-write', function (Request $request): array {
            $userId = $request->user()?->id;

            return [
                Limit::perMinute(120)->by('reactions-write:user:' . ($userId ?? 'guest')),
                Limit::perMinute(180)->by('reactions-write:ip:' . $request->ip()),
            ];
        });
    }

    private function configureSocialRateLimiters(): void
    {
        RateLimiter::for('social-write', function (Request $request): array {
            $userId = $request->user()?->id ?? 'guest';

            return [
                Limit::perMinute(60)->by('social-write:user:' . $userId),
                Limit::perMinute(120)->by('social-write:ip:' . $request->ip()),
            ];
        });

        RateLimiter::for('social-read', function (Request $request): array {
            $userId = $request->user()?->id ?? 'guest';

            return [
                Limit::perMinute(240)->by('social-read:user:' . $userId),
                Limit::perMinute(480)->by('social-read:ip:' . $request->ip()),
            ];
        });
    }

    private function configureSettingsRateLimiters(): void
    {
        RateLimiter::for('username-check', function (Request $request): Limit {
            $key = 'username-check:ip:' . $request->ip();

            if (method_exists(Limit::class, 'perSecond')) {
                return Limit::perSecond(5)->by($key);
            }

            return Limit::perMinute(300)->by($key);
        });

        RateLimiter::for('email-change-request', function (Request $request): Limit {
            $userId = $request->user()?->id;
            $key = $userId !== null
                ? 'email-change-request:user:' . $userId
                : 'email-change-request:ip:' . $request->ip();

            return Limit::perHour(1)->by($key);
        });
    }

    private function registerCpadMenuItems(): void
    {
        if (! class_exists(Menu::class)) {
            return;
        }

        try {
            /** @var Menu $menu */
            $menu = $this->app->make(Menu::class);
        } catch (\Throwable) {
            // Control panel menu registration should never block the app boot.
        }
    }
}