using Luna.Channels.Abstractions;
using Luna.Core.Abstractions;
using Luna.Identity.Abstractions;
using Luna.Shared;

namespace Luna.Channels.Cli;

public class CliChannel(
    string channelId,
    IChatHubContext hubContext,
    IUserIdentityService identityService) 
    : IChannel
{
    public string ChannelId { get; } = channelId;
    public string ChannelType => Abstractions.ChannelType.Cli;
    public string DisplayName { get; } = "Cli";
    public bool IsConnected { get; }
    
    public event ChannelMessageReceivedEventHandler? MessageReceived;
    public event ChannelConnectionChangedEventHandler? ConnectionStateChanged;
    
    public async Task<bool> VerifyChannelLinkAsync()
    {
        var currentUser = identityService.GetCurrentUser();

        if (identityService.IsChannelLinked(currentUser.UserId, ChannelType))
            return true;

        var pairingCode = identityService.StartChannelLink(currentUser.UserId, ChannelType);
        await SendMessageAsync(new ChannelMessage(
            MessageId: Guid.NewGuid().ToString(),
            ConversationId: Guid.NewGuid().ToString(),
            SenderId: Guid.NewGuid().ToString(),
            SenderName: "luna",
            Content:
            $"{ChannelType} channel is not linked to current user.\nGo to web interface and execute command \"/link [pairing code]\".\nYou will have to provide following PairingCode: {pairingCode}",
            Timestamp: DateTimeOffset.UtcNow));

        return false;
    }
    
    public async Task SendStreamingMessageAsync(IAsyncEnumerable<ChatStreamUpdate> messageStream, CancellationToken cancellationToken = default)
    {
        await hubContext.SendStreamingResponseAsync(ChannelId, messageStream, cancellationToken);
    }

    public async Task SendMessageAsync(ChannelMessage message, CancellationToken cancellationToken = default)
    {
        await hubContext.SendResponseAsync(ChannelId, message, cancellationToken);
    }
    
    public void RaiseMessageReceived(object? sender, ChannelMessage message)
    {
        MessageReceived?.Invoke(sender, new ChannelMessageReceivedEventArgs
        {
            Channel = this,
            Message = message,
            IsHandled = false
        });
    }
    
    public void Dispose() { }
}