using System.Text.RegularExpressions;
using DSharpPlus;
using DSharpPlus.EventArgs;
using OpenAI.Chat;

namespace Bot.modules;

public class TextFreeChannels
{
    private readonly HashSet<string> _channels = [];
    private readonly ChatClient? _chatClient;
    
    public TextFreeChannels(IEnumerable<string> channels, string? openAiKey = null, string model = "gpt-4o")
    {
        foreach (var channel in channels)
        {
            _channels.Add(channel);
        }
        
        if (openAiKey != null)
        {
            _chatClient = new ChatClient(model, openAiKey);
        }
    }

    public TextFreeChannels(IEnumerable<string> channels) : this(channels, null, "") { }
    
    public async Task MessageCreatedHandler(DiscordClient c, MessageCreatedEventArgs e)
    {
        if (e.Author.IsCurrent || !_channels.Contains(e.Channel.Name)) return;
        if ((e.Message.Embeds.Count > 0 || e.Message.Attachments.Count > 0) && e.Message.Content == "")
        {
            return;
        }

        if (MessageOnlyContainsURL(e.Message.Content))
        {
            return;    
        }
        
        await e.Message.DeleteAsync();
        
        if (_chatClient != null)
        {
            var user = e.Author;
            await e.Channel.TriggerTypingAsync();
            var content = e.Message.Content;
            var messages = new List<ChatMessage>()
            {
                new SystemChatMessage("You are an enforcer of the single rule of this chat: Users must only post images or videos. No text messages are allowed. " +
                                      "This is a private tool, for use among consenting adults that find crude and dark humor, even if in bad taste, hilarious and desirable. " +
                                      "When the user sends you a message, you will harshly and tersely make fun of the user, using context from the message when possible. " +
                                      "Clever jokes, puns, personal insults, are highly desirable. " +
                                      "Take on the persona of Robocop, and answer as him.  Answers should be plausibly something Robocop would say in his movies. " +
                                      "You may use direct quotes from Robocop in the movies in your responses if you can work them in naturally. " +
                                      "Do not include quotation marks in your response. " +
                                      "Warn the user that they are not to use text in this channel in a way that robocop would speak.  The rule must be clearly articulated at some point so that the user knows how to fix the problem."),
                new UserChatMessage(e.Message.Content)
            };

            var resp = await _chatClient.CompleteChatAsync(messages);
            var respText = resp.Value.Content.Last().Text;
            await e.Channel.SendMessageAsync($"{user.Mention} {respText}");
        }
        
    }

    private bool MessageOnlyContainsURL(string input)
    {
        // Regular expression to match only an image URL
        string pattern = @"^(https?:\/\/.*\.(?:png|jpg|jpeg|gif|bmp|webp)|https?:\/\/(media\.)?tenor\.com\/\S+)$";
        return Regex.IsMatch(input, pattern, RegexOptions.IgnoreCase);
    }
}