using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using NetCord.Rest;
using StreakBot.Data;
using StreakBot.Data.Entities;
using ChannelEntity = StreakBot.Data.Entities.Channel;
using ChannelType = StreakBot.Data.Entities.ChannelType;

namespace StreakBot.Services;

public class ChannelService
{
    private readonly StreakDbContext _context;
    private readonly RestClient _restClient;
    private readonly ILogger<ChannelService> _logger;

    public ChannelService(StreakDbContext context, RestClient restClient, ILogger<ChannelService> logger)
    {
        _context = context;
        _restClient = restClient;
        _logger = logger;
    }

    public async Task UpdateStreakChannelAsync(ulong serverId, int streakCount, bool endOfDay = false)
    {
        var channel = await _context.Channels
            .FirstOrDefaultAsync(c => c.ServerId == serverId && c.ChannelType == ChannelType.StreakChannel);

        var channelName = endOfDay ? $"🧊 {streakCount}" : $"🔥 {streakCount}";

        if (channel == null)
        {
            var properties = new GuildChannelProperties(channelName, NetCord.ChannelType.VoiceGuildChannel);
            var createdChannel = await _restClient.CreateGuildChannelAsync(serverId, properties);

            channel = new ChannelEntity
            {
                ServerId = serverId,
                ChannelId = createdChannel.Id,
                ChannelType = ChannelType.StreakChannel
            };

            _context.Channels.Add(channel);
            await _context.SaveChangesAsync();
        }
        else
        {
            await _restClient.ModifyGuildChannelAsync(channel.ChannelId, options => options.WithName(channelName));
        }
    }

    public async Task UpdateTimeChannelAsync(ulong serverId, TimeSpan resetTime)
    {
        var channel = await _context.Channels
            .FirstOrDefaultAsync(c => c.ServerId == serverId && c.ChannelType == ChannelType.TimeChannel);

        var timeRemaining = CalculateTimeRemaining(resetTime);
        var channelName = $"⏰ {timeRemaining:hh\\:mm}";

        if (channel == null)
        {
            var properties = new GuildChannelProperties(channelName, NetCord.ChannelType.VoiceGuildChannel);
            var createdChannel = await _restClient.CreateGuildChannelAsync(serverId, properties);

            channel = new ChannelEntity
            {
                ServerId = serverId,
                ChannelId = createdChannel.Id,
                ChannelType = ChannelType.TimeChannel
            };

            _context.Channels.Add(channel);
            await _context.SaveChangesAsync();
        }
        else
        {
            await _restClient.ModifyGuildChannelAsync(channel.ChannelId, options => options.WithName(channelName));
        }
    }

    private static TimeSpan CalculateTimeRemaining(TimeSpan resetTime)
    {
        var now = DateTime.UtcNow.TimeOfDay;

        if (now < resetTime)
        {
            return resetTime - now;
        }
        else
        {
            return TimeSpan.FromHours(24) - now + resetTime;
        }
    }

    public async Task<ChannelEntity?> GetChannelAsync(ulong serverId, ChannelType channelType)
    {
        return await _context.Channels
            .FirstOrDefaultAsync(c => c.ServerId == serverId && c.ChannelType == channelType);
    }

    public async Task<bool> DeleteChannelAsync(ulong channelId)
    {
        var test = await _restClient.DeleteChannelAsync(channelId);

        return true;
    }

    public async Task SendStreakReminderAsync(ulong user1Id, ulong user2Id, bool user1NeedsReminder, bool user2NeedsReminder, ulong serverId)
    {
        if (user1NeedsReminder)
        {
            try
            {
                var dmChannel = await _restClient.GetDMChannelAsync(user1Id);
                var message = new MessageProperties()
                    .WithContent($"Your streak with <@{user2Id}> will reset in less than an hour! Send a message in the server to keep it alive!");
                await _restClient.SendMessageAsync(dmChannel.Id, message);
            }
            catch (RestException)
            {
                _logger.LogWarning("Failed to send streak reminder DM to user {UserId}", user1Id);
                await SendReminderToTextChannelAsync(serverId, user1Id, user2Id);
            }
        }

        if (user2NeedsReminder)
        {
            try
            {
                var dmChannel = await _restClient.GetDMChannelAsync(user2Id);
                var message = new MessageProperties()
                    .WithContent($"Your streak with <@{user1Id}> will reset in less than an hour! Send a message in the server to keep it alive!");
                await _restClient.SendMessageAsync(dmChannel.Id, message);
            }
            catch (RestException)
            {
                _logger.LogWarning("Failed to send streak reminder DM to user {UserId}", user2Id);
                await SendReminderToTextChannelAsync(serverId, user2Id, user1Id);
            }
        }
    }

    private async Task SendReminderToTextChannelAsync(ulong serverId, ulong userToRemind, ulong streakPartnerUserId)
    {
        try
        {
            var guildChannels = await _restClient.GetGuildChannelsAsync(serverId);
            var textChannel = guildChannels.FirstOrDefault(c => c is NetCord.TextChannel) as NetCord.TextChannel;

            if (textChannel != null)
            {
                var message = new MessageProperties()
                    .WithContent($"<@{userToRemind}>, your streak with <@{streakPartnerUserId}> will reset in less than an hour! Send a message in the server to keep it alive! (DM failed to send)");
                await textChannel.SendMessageAsync(message);
            }
            else
            {
                _logger.LogWarning("No text channel found in server {ServerId} to send fallback reminder", serverId);
            }
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Failed to send fallback reminder to text channel in server {ServerId}", serverId);
        }
    }

    public async Task<ChannelEntity> CreateDmStreakMessageAsync(ulong channelId, int streakNumber, TimeSpan resetTime)
    {
        var timeRemaining = CalculateTimeRemaining(resetTime);
        var content = $"🔥 {streakNumber}\n⏰ {timeRemaining:hh\\:mm}";

        var messageProperties = new MessageProperties().WithContent(content);
        var sentMessage = await _restClient.SendMessageAsync(channelId, messageProperties);

        var channel = new ChannelEntity
        {
            ChannelId = channelId,
            ChannelType = ChannelType.DmChannel,
            MessageId = sentMessage.Id
        };

        _context.Channels.Add(channel);
        await _context.SaveChangesAsync();

        return channel;
    }

    public async Task UpdateDmStreakMessageAsync(ulong channelId, ulong messageId, int streakNumber, TimeSpan resetTime)
    {
        var timeRemaining = CalculateTimeRemaining(resetTime);
        var content = $"🔥 {streakNumber}\n⏰ {timeRemaining:hh\\:mm}";

        await _restClient.ModifyMessageAsync(channelId, messageId, message => message.WithContent(content));
    }
}