using Microsoft.EntityFrameworkCore;
using PnvPanel.Application.Auth;
using PnvPanel.Application.Common.Interfaces;
using PnvPanel.Application.Common.Messaging;
using PnvPanel.Application.Common.Models;
using PnvPanel.Domain.Activation;

namespace PnvPanel.Application.Activation;

public sealed class RequestActivationCommandHandler(
    IAppDbContext dbContext, IRealtimeNotifier notifier, ITelegramNotifier telegramNotifier, ICurrentUser currentUser)
    : ICommandHandler<RequestActivationCommand, Result<ActivationRequestDto>>
{
    public async Task<Result<ActivationRequestDto>> Handle(RequestActivationCommand command, CancellationToken cancellationToken)
    {
        if (currentUser.UserId is not { } userId)
            return Result.Failure<ActivationRequestDto>(AuthErrors.Unauthorized);

        var hasPending = await dbContext.ActivationRequests
            .AnyAsync(r => r.UserId == userId && r.Status == ActivationStatus.Pending, cancellationToken);

        if (hasPending)
            return Result.Failure<ActivationRequestDto>(ActivationErrors.AlreadyPending);

        var request = ActivationRequest.Create(userId, command.Comment);
        dbContext.ActivationRequests.Add(request);

        var userName = currentUser.UserName ?? userId.ToString();

        await notifier.NotifyActivationRequestedAsync(request.Id, userId, userName, request.Comment, request.CreatedAt, cancellationToken);
        await telegramNotifier.NotifyAdminsActivationRequestedAsync(request.Id, userName, request.Comment, cancellationToken);

        return Result.Success(new ActivationRequestDto(request.Id, request.Comment, request.CreatedAt));
    }
}