<?php

namespace App\Services\Onboarding;

use App\Models\OnboardingSession;
use App\Models\User;
use Illuminate\Support\Carbon;
use Illuminate\Support\Facades\DB;

class OnboardingLockService
{
    public function acquire(OnboardingSession $session, User $user, int $ttlSeconds = 600): bool
    {
        return DB::transaction(function () use ($session, $user, $ttlSeconds): bool {
            $session = OnboardingSession::query()->lockForUpdate()->findOrFail($session->getKey());

            if ($this->isLockedByOther($session, $user)) {
                return false;
            }

            $session->forceFill([
                'locked_by_user_id' => $user->getKey(),
                'locked_until' => Carbon::now()->addSeconds($ttlSeconds),
            ])->save();

            return true;
        });
    }

    public function renew(OnboardingSession $session, User $user, int $ttlSeconds = 600): bool
    {
        return DB::transaction(function () use ($session, $user, $ttlSeconds): bool {
            $session = OnboardingSession::query()->lockForUpdate()->findOrFail($session->getKey());

            if ((int) $session->locked_by_user_id !== (int) $user->getKey()) {
                return false;
            }

            $session->forceFill([
                'locked_until' => Carbon::now()->addSeconds($ttlSeconds),
            ])->save();

            return true;
        });
    }

    public function release(OnboardingSession $session, User $user): bool
    {
        return DB::transaction(function () use ($session, $user): bool {
            $session = OnboardingSession::query()->lockForUpdate()->findOrFail($session->getKey());

            if ((int) $session->locked_by_user_id !== (int) $user->getKey()) {
                return false;
            }

            $session->forceFill([
                'locked_by_user_id' => null,
                'locked_until' => null,
            ])->save();

            return true;
        });
    }

    public function takeover(OnboardingSession $session, User $newOwner, int $ttlSeconds = 600): void
    {
        DB::transaction(function () use ($session, $newOwner, $ttlSeconds): void {
            $session = OnboardingSession::query()->lockForUpdate()->findOrFail($session->getKey());

            $session->forceFill([
                'locked_by_user_id' => $newOwner->getKey(),
                'locked_until' => Carbon::now()->addSeconds($ttlSeconds),
            ])->save();
        });
    }

    private function isLockedByOther(OnboardingSession $session, User $user): bool
    {
        if ($session->locked_by_user_id === null || $session->locked_until === null) {
            return false;
        }

        if ($session->locked_until->isPast()) {
            return false;
        }

        return (int) $session->locked_by_user_id !== (int) $user->getKey();
    }
}