using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Reflection;
using System.Text;

namespace FlutterCodeGenerator
{
    internal class MethodMap
    {
        public List<ModelType> ParameterModeTypes;
        public ModelType ReturnParameterModelType { get; set; }
        private readonly string _methodName;

        public MethodMap(MethodInfo method)
        {
            ParameterModeTypes = new List<ModelType>();
            _methodName = method.Name;
            Type returnParameterType;
            if (!method.ReturnType.IsGenericType)
            {
                returnParameterType = typeof(void);
            }
            else
            {
                returnParameterType = method.ReturnType.GetGenericArguments()[0];
            }

            ReturnParameterModelType = ModelTypeGenerator.Create(returnParameterType, "", true);

            var parameters = method.GetParameters();
            foreach (var parameter in parameters)
            {
                var parameterType = parameter.ParameterType;
                var parameterModeType = ModelTypeGenerator.Create(parameterType, parameter.Name, true);
                ParameterModeTypes.Add(parameterModeType);
            }
        }

        public string GetMethodDartString()
        {
            var dartString = new StringBuilder();
            var parameterNames = string.Join(",", ParameterModeTypes.Select(r => r.GetFlutterTypeName() + " " + r.Name_Lower));
            var argumentNames = string.Join(",", ParameterModeTypes.Select(r => r.Name_Lower));
            if (ParameterModeTypes.Count > 1)
            {
                argumentNames = "[" + argumentNames + "]";
            }
            dartString.AppendLine($"\tFuture<{ReturnParameterModelType.GetFlutterTypeName()}> {LetterConverterHelper.FirstCharToLower(_methodName)}({parameterNames}) async {{");
            if (ReturnParameterModelType is VoidModelType)
            {
                dartString.AppendLine($"\t\tawait call(\"{_methodName}\", {argumentNames});");
            }
            else
            {
                dartString.AppendLine($"\t\tvar rpcRst = await call(\"{_methodName}\", {argumentNames});");
                if (ReturnParameterModelType is SimpleModelType && !(ReturnParameterModelType is ListModelType) && !(ReturnParameterModelType is DictionaryModelType) && !(ReturnParameterModelType is ArrayModelType))
                {
                    dartString.AppendLine("\t\treturn rpcRst;");
                }
                else if (ReturnParameterModelType is UserDefinedModeType || ReturnParameterModelType is UserDefinedGenericModelType || ReturnParameterModelType is UserDefinedDerivedModelType)
                {
                    dartString.AppendLine($"\t\tvar result = {ReturnParameterModelType.GetFlutterTypeName()}.fromJson(rpcRst as Map<String, dynamic>);");
                    dartString.AppendLine("\t\treturn result;");
                }
                else if (ReturnParameterModelType is ListModelType genericModelType)
                {
                    if (genericModelType.GenericArgumentModelType is SimpleModelType simpleModelType)
                    {
                        dartString.AppendLine($"\t\tvar result = (rpcRst as List).cast<{simpleModelType.GetFlutterTypeName()}>().toList();");
                        dartString.AppendLine("\t\treturn result;");
                    }
                    else if (genericModelType.GenericArgumentModelType is EnumModeType enumModelType)
                    {
                        dartString.AppendLine($"\t\tvar result = (rpcRst as List).map((e)=>{enumModelType.GetFlutterTypeName()}.values.firstWhere((i) => i.index == e)).toList();");
                        dartString.AppendLine("\t\treturn result;");
                    }
                    else if (genericModelType.GenericArgumentModelType is UserDefinedModeType userDefinedComplexModeType)
                    {
                        dartString.AppendLine($"\t\tvar result = (rpcRst as List).map((e)=>{userDefinedComplexModeType.GetFlutterTypeName()}.fromJson(e as Map<String, dynamic>)).toList();");
                        dartString.AppendLine("\t\treturn result;");
                    }
                    else if (genericModelType.GenericArgumentModelType is UserDefinedDerivedModelType userDefinedDerivedModelType)
                    {
                        dartString.AppendLine($"\t\tvar result = (rpcRst as List).map((e)=>{userDefinedDerivedModelType.GetFlutterTypeName()}.fromJson(e as Map<String, dynamic>)).toList();");
                        dartString.AppendLine("\t\treturn result;");
                    }
                }
                else if (ReturnParameterModelType is ArrayModelType arrayModelType)
                {
                    if (arrayModelType.Child is SimpleModelType simpleModelType)
                    {
                        dartString.AppendLine($"\t\tvar result = (rpcRst as List).cast<{simpleModelType.GetFlutterTypeName()}>().toList();");
                        dartString.AppendLine("\t\treturn result;");
                    }
                    else if (arrayModelType.Child is EnumModeType enumModelType)
                    {
                        dartString.AppendLine($"\t\tvar result = (rpcRst as List).map((e)=>{enumModelType.GetFlutterTypeName()}.values.firstWhere((i) => i.index == e)).toList();");
                        dartString.AppendLine("\t\treturn result;");
                    }
                    else if (arrayModelType.Child is UserDefinedModeType userDefinedComplexModeType)
                    {
                        dartString.AppendLine($"\t\tvar result = (rpcRst as List).map((e)=>{userDefinedComplexModeType.GetFlutterTypeName()}.fromJson(e as Map<String, dynamic>)).toList();");
                        dartString.AppendLine("\t\treturn result;");
                    }
                    else if (arrayModelType.Child is UserDefinedDerivedModelType userDefinedDerivedModelType)
                    {
                        dartString.AppendLine($"\t\tvar result = (rpcRst as List).map((e)=>{userDefinedDerivedModelType.GetFlutterTypeName()}.fromJson(e as Map<String, dynamic>)).toList();");
                        dartString.AppendLine("\t\treturn result;");
                    }
                }
                else if (ReturnParameterModelType is DictionaryModelType dictionaryModelType)
                {
                    dartString.AppendLine($"\t\tvar result = (rpcRst as Map).cast<{dictionaryModelType.GenericArgumentModelTypeList[0].GetFlutterTypeName()},{dictionaryModelType.GenericArgumentModelTypeList[1].GetFlutterTypeName()}>();");
                    dartString.AppendLine("\t\treturn result;");
                }
            }
            dartString.AppendLine("\t}");
            return dartString.ToString();
        }
    }
}