using System.Collections;
using System.Collections.Generic;
using System.Reflection;
using System.Linq;
using Cysharp.Threading.Tasks;
using System.Text;
using System.Threading.Tasks;

namespace BITKit
{
    public static class BITCommand
    {
        [BITCommand]
        public static void Help()
        {

            StringBuilder sb = new StringBuilder();
            sb.AppendLine("----------Commands--------");
            methodInfos.ForEach(x =>
            {
                StringBuilder stringBuilder = new();
                StringBuilder samplesBuilder=new StringBuilder();
                stringBuilder.Append(x.Value.Name);
                stringBuilder.Append('(');
                foreach (var parmeter in x.Value.GetParameters())
                {
                    stringBuilder.Append($"{parmeter.ParameterType.Name} {parmeter.Name}");
                    samplesBuilder.Append(parmeter.Name);
                }
                stringBuilder.Append(");");

                sb.AppendLine($"{stringBuilder} \t// {x.Value.Name} {samplesBuilder}");
            });
            sb.AppendLine("----------End--------");
            BIT4Log.Log(sb);
        }
        [BITCommand]
        public static void Error(string value)
        {
            BIT4Log.Log(value);
        }
        [BITCommand]
        public static void Warning(string value)
        {
            BIT4Log.Warnning(value);
        }

        [BITCommand]
        public static async void Quit()
        {
            await BITApp.Stop();
        }
        public static IEnumerable<MethodInfo> GetMethodInfos(string keyWord)
        {
            return methodInfos.Where(x => x.Key.Contains(keyWord)).Select(x => x.Value);
        }
        public static async void Excute(string cmd)
        {
            await UniTask.SwitchToThreadPool();
            await TaskHelper.WaitUntil(() => state is InitializationState.Initialized);
            var split = cmd.Split(" ").ToList();
            var args = split.GetRange(1, split.Count - 1);
            cmd = split.First().ToLower();
            if (methodInfos.TryGetValue(cmd, out var methodInfo))
            {
                var parameterInfos = methodInfo.GetParameters();
                var parameters = new List<object>();
                parameterInfos.ForEach((i, x) =>
                {
                    var arg = args[i];
                    object parameter = arg;
                    if (x.ParameterType == typeof(int))
                    {
                        parameter = int.Parse(arg);
                    }
                    else if (x.ParameterType == typeof(float))
                    {
                        parameter = float.Parse(arg);
                    }
                    parameters.Add(parameter);
                });
                //await UniTask.SwitchToMainThread();
                methodInfo.Invoke(null, parameters.ToArray());
            }
            else
            {
                BIT4Log.Log($"没有找到命令:{cmd}");
            }
        }
        static Dictionary<string, MethodInfo> methodInfos = new();
        static InitializationState state;
        [ExcuteOnStart]
        public static void Start()
        {
            try
            {
                Init();
            }
            catch (System.Exception e)
            {

                BIT4Log.LogException(e);
            }

        }
        [ExcuteOnStop]
        public static void Stop()
        {
            state = 0;
            methodInfos.Clear();
        }
        static async void Init()
        {
            state = InitializationState.Initializing;
            await UniTask.SwitchToThreadPool();
            Data.AddListener<string>("Cmd", Excute);
            Data.AddListener<string>("cmd", Excute);
            Data.AddListener<string>("command", Excute);
            Data.AddListener<string>("Command", Excute);
            methodInfos.Clear();

            var commands = (await ReflectionHelper.GetMethods<BITCommandAttribute>())
                    .Where(x => x.IsStatic)
                    .Where(x => x.GetCustomAttribute<BITCommandAttribute>() is not null);
            foreach (var command in commands)
            {
                try
                {
                    methodInfos.Add(command.Name.ToLower(), command);
                }
                catch (System.Exception e)
                {
                    BIT4Log.LogException(e);
                }
                
            }
            state = InitializationState.Initialized;
        }
    }
}