using System;
using System.Reflection;
using Bridge;
using Newtonsoft.Json;

namespace Cbdx
{
    public class DataExchangeServiceFactory
    {
        private readonly ExternalDataExchangeDispatcher _dataExchangeDispatcher;

        public DataExchangeServiceFactory(ExternalDataExchangeDispatcher dataExchangeDispatcher)
        {
            _dataExchangeDispatcher = dataExchangeDispatcher;
        }

        public TInterface Create<TInterface>()
        {
            return Create<TInterface>(typeof(TInterface).Name);
        }

        public TInterface Create<TInterface>(string serviceName)
        {
            var interfaceType = typeof(TInterface);
            if (interfaceType.IsNested) throw new NotSupportedException("Not support nested type define");

            var interfaceMethodInfos = interfaceType.GetMethods(BindingFlags.Public | BindingFlags.Instance);

            object si = new { };

            foreach (var methodInfo in interfaceMethodInfos)
            {
                if (1 < methodInfo.GetParameters().Length) throw new NotSupportedException($"Maximum 1 param supported, {interfaceType.FullName}::{methodInfo.Name}");

                var explicitMethodName = $"{interfaceType.FullName}.{methodInfo.Name}".Replace('.', '$');

                var implement = new Func<object, object>(input =>
                {
                    //handle params and returns
                    var inputJson = JsonConvert.SerializeObject(input);
                    DevUtils.LogDebug($"Invoke Service:{serviceName}, Action:{methodInfo.Name}, Input:{inputJson}");
                    var outputJson = _dataExchangeDispatcher.InvokeService(serviceName, methodInfo.Name, inputJson);
                    DevUtils.LogDebug($"Return Service:{serviceName}, Action:{methodInfo.Name}, Return:{outputJson}");

                    var errorCheck = JsonConvert.DeserializeObject<DataExchangeResultBase>(outputJson);
                    if (false == errorCheck.Success)
                    {
                        var errorMessage = JsonConvert.DeserializeObject<DataExchangeErrorResult>(outputJson);
                        throw new DataExchangeException(errorMessage.Message, errorMessage.StackTrace);
                    }

                    var returnType = typeof(DataExchangeDataResult<>).MakeGenericType(new[] { methodInfo.ReturnType });

                    var output = JsonConvert.DeserializeObject(outputJson, returnType);

                    DevUtils.LogDebug(output);

                    return output["Data"];
                });

                //interface alias
                si[explicitMethodName] = implement;
                si[methodInfo.Name] = implement;
            }

            return DuckCast<TInterface>(si);
        }

        [Template("{instance}")]
        private static extern T DuckCast<T>(object instance);
    }
}