using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using TeamAAS_VP.Core.Lights;
using TeamAAS_VP.Interfaces;
using TeamAAS_VP.Models;
using TeamAAS_VP.Models.Lights;

namespace TeamAAS_VP.Services
{
    public class LightManagerService : ILightManagerService
    {
        private readonly Dictionary<int, ILightController> _controllers;
        private readonly Dictionary<int, ILightChannel> _globalChannels;
        private readonly Dictionary<LightModel, Func<int, TeamAAS_VP.Models.Lights.LightControllerConfig, ILightController>> _controllerFactories;
        private int _nextGlobalChannelId = 0;

        public IReadOnlyDictionary<int, ILightController> Controllers => _controllers;
        public IReadOnlyDictionary<int, ILightChannel> GlobalChannels => _globalChannels;

        public event EventHandler<LightControllerEventArgs> ControllerAdded;
        public event EventHandler<LightControllerEventArgs> ControllerRemoved;
        public event EventHandler<LightChannelEventArgs> ChannelStatusChanged;

        public LightManagerService()
        {
            _controllers = new Dictionary<int, ILightController>();
            _globalChannels = new Dictionary<int, ILightChannel>();
            _controllerFactories = new Dictionary<LightModel, Func<int, TeamAAS_VP.Models.Lights.LightControllerConfig, ILightController>>();

            RegisterDefaultFactories();
        }

        private void RegisterDefaultFactories()
        {
            // 注册KCS控制器工厂
            RegisterControllerFactory(LightModel.KCS_KDC_12V60W_4T, (id, config) =>
            {
                if (config == null) throw new ArgumentNullException(nameof(config));
                var protocol = new SerialPortProtocol(config.SerialPortConfig);
                return new KCSLightController(id, protocol, config.ChannelCount);
            });
        }

        public void RegisterControllerFactory(LightModel model, Func<int, TeamAAS_VP.Models.Lights.LightControllerConfig, ILightController> factory)
        {
            _controllerFactories[model] = factory;
        }

        public async Task<ILightController> RegisterControllerAsync(int id, TeamAAS_VP.Models.Lights.LightControllerConfig configuration)
        {
            if (configuration == null) throw new ArgumentNullException(nameof(configuration));

            if (_controllers.ContainsKey(id))
                throw new ArgumentException($"Controller with id '{id}' already exists");

            if (!_controllerFactories.TryGetValue(configuration.LightModel, out var factory))
                throw new ArgumentException($"No factory registered for model '{configuration.LightModel}'");

            var controller = factory(id, configuration);
            if (controller == null)
                throw new InvalidOperationException("Factory returned null controller");

            _controllers[id] = controller;

            // 映射全局通道
            for (int i = 0; i < controller.Channels.Count; i++)
            {
                var channelConfig = configuration.ChannelConfigs[i];
                int globalIndex = channelConfig.GlobalIndex;

                // 检查该全局ID是否已被占用
                if (_globalChannels.ContainsKey(globalIndex))
                {
                    // 自动重新分配全局ID
                    globalIndex = _nextGlobalChannelId++;
                }
                else if (globalIndex >= _nextGlobalChannelId)
                {
                    // 更新下一个可用ID
                    _nextGlobalChannelId = globalIndex + 1;
                }

                // 更新配置中的GlobalIndex（如果需要）
                if (channelConfig.GlobalIndex != globalIndex)
                {
                    channelConfig.GlobalIndex = globalIndex;
                }

                // 建立映射
                _globalChannels[globalIndex] = controller.Channels[i];
            }

            ControllerAdded?.Invoke(this, new LightControllerEventArgs(controller));
            return controller;
        }

        public async Task<bool> UnregisterControllerAsync(int controllerId)
        {
            if (!_controllers.TryGetValue(controllerId, out var controller))
                return false;

            // 移除全局通道映射
            var channelsToRemove = _globalChannels
                .Where(kvp => controller.Channels.Contains(kvp.Value))
                .Select(kvp => kvp.Key)
                .ToList();

            foreach (var channelId in channelsToRemove)
            {
                _globalChannels.Remove(channelId);
            }

            _controllers.Remove(controllerId);
            await controller.DisconnectAsync();
            controller.Dispose();

            ControllerRemoved?.Invoke(this, new LightControllerEventArgs(controller));
            return true;
        }

        public async Task<bool> SetGlobalChannelBrightnessAsync(int globalChannelId, int brightness)
        {
            if (!_globalChannels.TryGetValue(globalChannelId, out var channel))
                return false;

            var result = await channel.SetBrightnessAsync(brightness);
            ChannelStatusChanged?.Invoke(this, new LightChannelEventArgs(channel, channel.IsOn, channel.Brightness));
            return result;
        }

        public async Task<bool> TurnOnGlobalChannelAsync(int globalChannelId)
        {
            if (!_globalChannels.TryGetValue(globalChannelId, out var channel))
                return false;

            var result = await channel.TurnOnAsync();
            ChannelStatusChanged?.Invoke(this, new LightChannelEventArgs(channel, channel.IsOn, channel.Brightness));
            return result;
        }

        public async Task<bool> TurnOffGlobalChannelAsync(int globalChannelId)
        {
            if (!_globalChannels.TryGetValue(globalChannelId, out var channel))
                return false;

            var result = await channel.TurnOffAsync();
            ChannelStatusChanged?.Invoke(this, new LightChannelEventArgs(channel, channel.IsOn, channel.Brightness));
            return result;
        }

        public async Task<bool> ConnectAllAsync()
        {
            var tasks = _controllers.Values.Select(c => c.ConnectAsync());
            var results = await Task.WhenAll(tasks);
            return results.All(r => r);
        }

        public async Task<bool> DisconnectAllAsync()
        {
            foreach (var controller in _controllers.Values)
            {
                await controller.DisconnectAsync();
            }
            return true;
        }

        public Task SaveConfigurationAsync(string filePath)
        {
            // 实现配置保存
            return Task.CompletedTask;
        }

        public Task LoadConfigurationAsync(string filePath)
        {
            // 实现配置加载
            return Task.CompletedTask;
        }
    }
}