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

namespace PnvPanel.Application.Admin.Support;

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

        var ticket = await dbContext.SupportTickets.FirstOrDefaultAsync(
            t => t.Id == command.TicketId,
            cancellationToken
        );
        if (ticket is null)
            return Result.Failure(SupportErrors.NotFound);

        if (ticket.Type != TicketType.RoleRequest)
            return Result.Failure(SupportErrors.NotRoleRequest);

        if (ticket.Status != TicketStatus.Open)
            return Result.Failure(SupportErrors.NotOpen);

        Guid roleId;
        if (ticket.RequestedRoleId is { } existingRoleId)
        {
            roleId = existingRoleId;
        }
        else
        {
            var createResult = await roleService.CreateRoleAsync(
                ticket.ProposedRoleName!,
                ticket.ProposedMaxConfigs!.Value,
                ticket.ProposedMaxIpLimit!.Value,
                billingEnabled: false,
                cancellationToken
            );
            if (!createResult.IsSuccess)
                return Result.Failure(createResult.Error);

            roleId = createResult.Value.Id;
        }

        var assignResult = await roleService.ChangeUserRoleAsync(
            ticket.UserId,
            roleId,
            cancellationToken
        );
        if (!assignResult.IsSuccess)
            return assignResult;

        ticket.Resolve();

        dbContext.AuditLogs.Add(
            AuditLog.Create(
                adminId,
                "RoleRequestApproved",
                "SupportTicket",
                ticket.Id.ToString(),
                metadata: null,
                AuditSource.Web
            )
        );

        await notifier.NotifyTicketUpdatedAsync(ticket.Id, ticket.UserId, cancellationToken);
        await telegramNotifier.NotifyUserAsync(
            ticket.UserId,
            "✅ Ваша заявка на роль одобрена.",
            $"/support?ticket={ticket.Id}",
            cancellationToken
        );

        return Result.Success();
    }
}