namespace GmRelay.DiscordBot.Features.Sessions;

using NetCord.Rest;
using NetCord.Services.ApplicationCommands;

[SlashCommand("reschedule", "Initiate reschedule voting for a session")]
public class DiscordRescheduleCommand : ApplicationCommandModule<SlashCommandContext>
{
    private readonly DiscordRescheduleHandler _handler;
    private readonly ILogger<DiscordRescheduleCommand> _logger;

    public DiscordRescheduleCommand(DiscordRescheduleHandler handler, ILogger<DiscordRescheduleCommand> logger)
    {
        _handler = handler;
        _logger = logger;
    }

    public async Task ExecuteAsync(
        [SlashCommandParameter(Name = "session", Description = "Session ID to reschedule")] string sessionIdText,
        [SlashCommandParameter(Name = "option1", Description = "First time option (YYYY-MM-DD HH:mm)")] string option1,
        [SlashCommandParameter(Name = "option2", Description = "Second time option (YYYY-MM-DD HH:mm)")] string option2,
        [SlashCommandParameter(Name = "option3", Description = "Third time option (optional)")] string? option3 = null,
        [SlashCommandParameter(Name = "deadline", Description = "Voting deadline (YYYY-MM-DD HH:mm)")] string deadline = "")
    {
        var guild = Context.Guild
            ?? throw new InvalidOperationException("This command can only be used in a guild.");

        if (!Guid.TryParse(sessionIdText, out var sessionId))
        {
            await Context.Interaction.SendResponseAsync(
                InteractionCallback.Message("❌ Некорректный ID сессии."));
            return;
        }

        var options = new List<string> { option1, option2 };
        if (!string.IsNullOrWhiteSpace(option3))
            options.Add(option3);

        var parsedOptions = new List<DateTimeOffset>();
        foreach (var opt in options)
        {
            var result = DiscordNewSessionHandler.ParseTimeInput(opt);
            if (!result.IsSuccess)
            {
                await Context.Interaction.SendResponseAsync(
                    InteractionCallback.Message($"❌ {opt}: {result.Error}"));
                return;
            }
            parsedOptions.Add(result.Value);
        }

        var deadlineResult = DiscordNewSessionHandler.ParseTimeInput(deadline);
        if (!deadlineResult.IsSuccess)
        {
            await Context.Interaction.SendResponseAsync(
                InteractionCallback.Message($"❌ Дедлайн: {deadlineResult.Error}"));
            return;
        }

        if (deadlineResult.Value >= parsedOptions.Min())
        {
            await Context.Interaction.SendResponseAsync(
                InteractionCallback.Message("❌ Дедлайн должен быть раньше первого варианта времени."));
            return;
        }

        var resolvedPermissions = GetResolvedPermissions(guild, Context.User.Id);

        try
        {
            var result = await _handler.HandleAsync(
                guildId: guild.Id.ToString(),
                channelId: Context.Channel.Id.ToString(),
                userId: Context.User.Id,
                userDisplayName: Context.User.GlobalName ?? Context.User.Username,
                resolvedPermissions: resolvedPermissions,
                guildOwnerId: guild.OwnerId,
                sessionId: sessionId,
                options: parsedOptions,
                deadline: deadlineResult.Value,
                CancellationToken.None);

            await Context.Interaction.SendResponseAsync(
                InteractionCallback.Message(
                    $"🗳 Голосование за перенос запущено! Дедлайн: {deadlineResult.Value:yyyy-MM-dd HH:mm} UTC."));
        }
        catch (UnauthorizedAccessException ex)
        {
            await Context.Interaction.SendResponseAsync(
                InteractionCallback.Message($":no_entry: {ex.Message}"));
        }
        catch (InvalidOperationException ex)
        {
            await Context.Interaction.SendResponseAsync(
                InteractionCallback.Message($":warning: {ex.Message}"));
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Failed to initiate reschedule for session {SessionId}", sessionId);
            await Context.Interaction.SendResponseAsync(
                InteractionCallback.Message(":boom: Ошибка при запуске голосования."));
        }
    }

    private static ulong GetResolvedPermissions(NetCord.Gateway.Guild guild, ulong userId)
    {
        if (!guild.Users.TryGetValue(userId, out var guildUser))
            return 0;
        ulong resolved = 0;
        foreach (var roleId in guildUser.RoleIds)
        {
            if (guild.Roles.TryGetValue(roleId, out var role))
                resolved |= (ulong)role.Permissions;
        }
        return resolved;
    }
}