<?php

namespace App\Services\Meet;

use App\Models\Participant;
use App\Models\Room;
use App\Models\Session;
use App\Models\User;
use App\Services\Meet\Media\MediaProviderInterface;
use Illuminate\Http\Request;
use Illuminate\Support\Str;

class SessionService
{
    public function __construct(
        protected MediaProviderInterface $media,
        protected RoomService $rooms,
    ) {}

    public function start(Room $room, User $host): Session
    {
        $existing = $room->activeSession();
        if ($existing) {
            return $existing;
        }

        app(LicenseService::class)->assertCanStartSession($room->organization, $room->branch_id);

        $session = Session::create([
            'owner_ref' => $room->owner_ref,
            'room_id' => $room->id,
            'media_room_name' => $this->rooms->mediaRoomName($room),
            'status' => 'live',
            'started_at' => now(),
        ]);

        $room->update(['status' => 'live']);

        $this->media->createRoom($session->media_room_name);

        $this->joinParticipant($session, $host, 'host');

        if ($room->setting('auto_record', false)) {
            app(RecordingService::class)->start($session, $host);
        }

        app(MeetNotificationService::class)->meetingStarted($session, $host);

        app(\App\Services\Integrations\WebhookDispatcher::class)->meetingStarted($session);

        AuditLogger::record($room->owner_ref, 'session.started', $room->organization_id, $host->ownerRef(), Session::class, $session->id);

        return $session;
    }

    public function end(Session $session, string $actorRef): Session
    {
        $session->update([
            'status' => 'ended',
            'ended_at' => now(),
        ]);

        $session->room->update(['status' => 'ended']);

        $session->participants()
            ->where('status', 'joined')
            ->update(['status' => 'left', 'left_at' => now()]);

        foreach ($session->recordings()->where('status', 'recording')->get() as $recording) {
            app(RecordingService::class)->stop($recording, $actorRef);
        }

        if ($session->room->isRecurring()) {
            app(RecurringMeetingService::class)->spawnNextOccurrences($session->room, 1);
        }

        AuditLogger::record($session->owner_ref, 'session.ended', $session->room->organization_id, $actorRef, Session::class, $session->id);

        app(\App\Services\Integrations\WebhookDispatcher::class)->meetingEnded($session);

        app(UsageMeteringService::class)->recordSessionUsage($session);

        return $session;
    }

    public function joinParticipant(
        Session $session,
        ?User $user,
        string $role,
        ?string $displayName = null,
        ?string $email = null,
    ): Participant {
        $userRef = $user?->ownerRef();

        $existing = $session->participants()
            ->when($userRef, fn ($q) => $q->where('user_ref', $userRef))
            ->when(! $userRef && $email, fn ($q) => $q->where('email', $email))
            ->whereIn('status', ['invited', 'waiting', 'joined'])
            ->first();

        if ($existing) {
            $existing->update([
                'status' => 'joined',
                'joined_at' => now(),
                'left_at' => null,
                'display_name' => $displayName ?? $existing->display_name,
                'ip_address' => request()?->ip(),
            ]);

            return $existing;
        }

        $participant = Participant::create([
            'owner_ref' => $session->owner_ref,
            'session_id' => $session->id,
            'user_ref' => $userRef,
            'display_name' => $displayName ?? $user?->name ?? 'Guest',
            'email' => $email,
            'role' => $role,
            'status' => 'joined',
            'joined_at' => now(),
            'ip_address' => request()?->ip(),
        ]);

        $this->updatePeakParticipants($session);

        AuditLogger::record(
            $session->owner_ref,
            'participant.joined',
            $session->room->organization_id,
            $userRef,
            Participant::class,
            $participant->id,
        );

        return $participant;
    }

    public function rememberParticipantSession(Request $request, Participant $participant, ?Session $session = null): void
    {
        $session ??= $participant->session;
        $request->session()->put("meet.participant.{$session->uuid}", $participant->uuid);
    }

    public function joinedParticipantForUser(Session $session, User $user): ?Participant
    {
        return $session->participants()
            ->where('user_ref', $user->ownerRef())
            ->whereIn('status', ['invited', 'waiting', 'joined'])
            ->first();
    }

    public function leaveParticipant(Participant $participant): Participant
    {
        $participant->update([
            'status' => 'left',
            'left_at' => now(),
            'hand_raised' => false,
        ]);

        AuditLogger::record(
            $participant->owner_ref,
            'participant.left',
            $participant->session->room->organization_id,
            $participant->user_ref,
            Participant::class,
            $participant->id,
        );

        return $participant;
    }

    public function generateMediaToken(Participant $participant): string
    {
        $session = $participant->session;
        $room = $session->room;
        $isHost = $participant->isHost();
        $breakoutService = app(BreakoutService::class);
        $webinarService = app(WebinarService::class);
        $mediaRoom = $breakoutService->mediaRoomForParticipant($participant);
        $canPublish = $webinarService->canPublish($room, $participant) && $participant->canPublishMedia();

        return $this->media->generateToken(
            $mediaRoom,
            $participant->uuid,
            $participant->display_name,
            [
                'can_publish' => $canPublish,
                'can_subscribe' => true,
                'can_publish_data' => true,
                'room_admin' => $isHost,
            ],
        );
    }

    public function getOrStartSession(Room $room, User $host): Session
    {
        if ($room->activeSession()) {
            return $room->activeSession();
        }

        return $this->start($room, $host);
    }

    public function lock(Session $session, string $actorRef): Session
    {
        $session->update(['is_locked' => true, 'locked_at' => now()]);
        AuditLogger::record($session->owner_ref, 'meeting.locked', $session->room->organization_id, $actorRef, Session::class, $session->id);

        return $session;
    }

    public function unlock(Session $session, string $actorRef): Session
    {
        $session->update(['is_locked' => false, 'locked_at' => null]);
        AuditLogger::record($session->owner_ref, 'meeting.unlocked', $session->room->organization_id, $actorRef, Session::class, $session->id);

        return $session;
    }

    protected function updatePeakParticipants(Session $session): void
    {
        $count = $session->participants()->where('status', 'joined')->count();
        if ($count > $session->peak_participants) {
            $session->update(['peak_participants' => $count]);
        }
    }
}