using System;
using System.Collections.Generic;
using System.IO;
using System.Threading.Tasks;
using DSharpPlus.Entities;
using DSharpPlus.Exceptions;
using DSharpPlus.SlashCommands;
using DSharpPlus.SlashCommands.Attributes;

namespace Breadcraft.Commands;

public class TranscriptCommand : ApplicationCommandModule
{
	[SlashRequireGuild]
	[SlashCommand("transcript", "Creates a transcript of a ticket.")]
	public async Task OnExecute(InteractionContext command, [Option("Ticket", "(Optional) Ticket number to get transcript of.")] long ticketID = 0)
	{
		await command.DeferAsync(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;
			}
		}

		// Log it if the log channel exists
		DiscordChannel logChannel = command.Guild.GetChannel(Config.logChannel);
		if (logChannel != null)
		{
			await using FileStream file = new FileStream(Transcriber.GetPath(ticket.id), FileMode.Open, FileAccess.Read);

			DiscordMessageBuilder message = new DiscordMessageBuilder();
			message.WithEmbed(new DiscordEmbedBuilder
			{
				Color = DiscordColor.Green,
				Description = "Ticket " + ticket.id.ToString("00000") + " transcript generated by " + command.Member.Mention + ".\n",
				Footer = new DiscordEmbedBuilder.EmbedFooter { Text = '#' + command.Channel.Name }
			});
			message.AddFiles(new Dictionary<string, Stream> { { Transcriber.GetFilename(ticket.id), file } });

			await logChannel.SendMessageAsync(message);
		}

		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.WithEmbed(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"
		}));
	}
}