using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Threading.Tasks;
using DSharpPlus.Commands;
using DSharpPlus.Commands.ContextChecks;
using DSharpPlus.Commands.Processors.SlashCommands;
using DSharpPlus.Entities;
using DSharpPlus.Exceptions;

namespace SupportChild.Commands;

public class TranscriptCommand
{
    [RequireGuild]
    [Command("transcript")]
    [Description("Creates a transcript of a ticket.")]
    public async Task OnExecute(SlashCommandContext command, [Parameter("ticket-id")][Description("(Optional) Ticket number to get transcript of.")] long ticketID = 0)
    {
        await command.DeferResponseAsync(true);
        Database.Ticket ticket;
        if (ticketID == 0) // If there are no arguments use current channel
        {
            if (Database.TryGetOpenTicket(command.Channel.Id, out ticket))
            {
                try
                {
                    await Transcriber.ExecuteAsync(command.Channel.Id, ticket.id);
                }
                catch (Exception)
                {
                    await command.EditResponseAsync(new DiscordWebhookBuilder().AddEmbed(new DiscordEmbedBuilder
                    {
                        Color = DiscordColor.Red,
                        Description = "ERROR: Could not save transcript file. Aborting..."
                    }));
                    throw;
                }
            }
            else
            {
                await command.EditResponseAsync(new DiscordWebhookBuilder().AddEmbed(new DiscordEmbedBuilder
                {
                    Color = DiscordColor.Red,
                    Description = "This channel is not a ticket."
                }));
                return;
            }
        }
        else
        {
            // If the ticket is still open, generate a new fresh transcript
            if (Database.TryGetOpenTicketByID((uint)ticketID, out ticket) && ticket?.creatorID == command.Member.Id)
            {
                try
                {
                    await Transcriber.ExecuteAsync(command.Channel.Id, ticket.id);
                }
                catch (Exception)
                {
                    await command.EditResponseAsync(new DiscordWebhookBuilder().AddEmbed(new DiscordEmbedBuilder
                    {
                        Color = DiscordColor.Red,
                        Description = "ERROR: Could not save transcript file. Aborting..."
                    }));
                    throw;
                }

            }
            // If there is no open or closed ticket, send an error. If there is a closed ticket we will simply use the old transcript from when the ticket was closed.
            else if (!Database.TryGetClosedTicket((uint)ticketID, out ticket) || (ticket?.creatorID != command.Member.Id && !Database.IsStaff(command.Member.Id)))
            {
                await command.EditResponseAsync(new DiscordWebhookBuilder().AddEmbed(new DiscordEmbedBuilder
                {
                    Color = DiscordColor.Red,
                    Description = "Could not find a closed ticket with that number which you opened.\n(Use the /list command to see all your tickets)"
                }));
                return;
            }
        }

        try
        {
            // Log it if the log channel exists
            DiscordChannel logChannel = await SupportChild.client.GetChannelAsync(Config.logChannel);
            await using FileStream file = new FileStream(Transcriber.GetPath(ticket.id), FileMode.Open, FileAccess.Read);

            DiscordMessageBuilder message = new DiscordMessageBuilder();
            message.AddEmbed(new DiscordEmbedBuilder
            {
                Color = DiscordColor.Green,
                Description = "Transcript generated by " + command.User.Mention + ".",
                Footer = new DiscordEmbedBuilder.EmbedFooter
                {
                    Text = "Ticket: " + ticket.id.ToString("00000")
                }
            });
            message.AddFiles(new Dictionary<string, Stream> { { Transcriber.GetFilename(ticket.id), file } });

            await logChannel.SendMessageAsync(message);
        }
        catch (NotFoundException)
        {
            Logger.Error("Could not find the log channel.");
        }

        try
        {
            // Send transcript in a direct message
            await using FileStream file = new FileStream(Transcriber.GetPath(ticket.id), FileMode.Open, FileAccess.Read);

            DiscordMessageBuilder directMessage = new DiscordMessageBuilder();
            directMessage.AddEmbed(new DiscordEmbedBuilder
            {
                Color = DiscordColor.Green,
                Description = "Transcript generated!\n"
            });
            directMessage.AddFiles(new Dictionary<string, Stream> { { Transcriber.GetFilename(ticket.id), file } });

            await command.Member.SendMessageAsync(directMessage);
        }
        catch (UnauthorizedException)
        {
            await command.EditResponseAsync(new DiscordWebhookBuilder().AddEmbed(new DiscordEmbedBuilder
            {
                Color = DiscordColor.Red,
                Description = "Not allowed to send direct message to you, please check your privacy settings.\n"
            }));
            return;
        }

        await command.EditResponseAsync(new DiscordWebhookBuilder().AddEmbed(new DiscordEmbedBuilder
        {
            Color = DiscordColor.Green,
            Description = "Transcript sent!\n"
        }));
    }
}