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

namespace FlutterCodeGenerator
{
    internal class ServiceMap
    {
        public List<MethodMap> MethodMapList;

        public static List<ComplexModelType> TemporaryList { get; set; }
        private List<ComplexModelType> _usedComplexModelTypeList;

        private List<string> _userDefinedComplexReturnTypeList;
        private string _serviceName;

        public ServiceMap(Type type)
        {
            _usedComplexModelTypeList = new List<ComplexModelType>();
            TemporaryList = new List<ComplexModelType>();
            MethodMapList = new List<MethodMap>();
            var methodsList = type.GetMethods();
            _serviceName = type.Name[1..];
            foreach (var method in methodsList)
            {
                var methodMap = new MethodMap(method);
                MethodMapList.Add(methodMap);
            }
            _usedComplexModelTypeList.AddRange(TemporaryList);
            TemporaryList.Clear();
        }

        public string GetServiceModelDartString()
        {
            var dartString = new StringBuilder();
            var importServiceList = new List<string>();
            foreach (var modelType in _usedComplexModelTypeList)
            {
                if (!CodeGenerator.AlreadyGeneratedList.Any(x => x.Key.ParameterType.Name == modelType.ParameterType.Name && x.Key.ParameterType.Namespace == modelType.ParameterType.Namespace))
                {
                    CodeGenerator.AlreadyGeneratedList.Add(modelType, _serviceName);
                    dartString.AppendLine(modelType.GetDartString());
                }
                else
                {
                    var importService = CodeGenerator.AlreadyGeneratedList.FirstOrDefault(x => x.Key.ParameterType.Name == modelType.ParameterType.Name && x.Key.ParameterType.Namespace == modelType.ParameterType.Namespace).Value;
                    if (importService == null)
                    {
                        throw new Exception("Import Service is null");
                    }
                    if (importService != _serviceName && !importServiceList.Contains(importService))
                    {
                        importServiceList.Add(importService);
                    }
                }
            }
            if (string.IsNullOrWhiteSpace(dartString.ToString()))
            {
                return null;
            }
            var serviceModelDartString = new StringBuilder();
            foreach (var importService in importServiceList)
            {
                serviceModelDartString.AppendLine($"import '{LetterConverterHelper.FirstCharToLower(importService[0..^7])}.m.dart';");
            }
            if (importServiceList.Count > 0)
            {
                serviceModelDartString.AppendLine();
            }

            var dartStringInfo = dartString.ToString();
            if (dartStringInfo.Contains("JsonRpcUtils"))
            {
                serviceModelDartString.AppendLine(CodeGenerator.StringUtils);
                serviceModelDartString.AppendLine();
            }

            if (dartStringInfo.Contains("FJsonConvert"))
            {
                serviceModelDartString.AppendLine(CodeGenerator.StringJsonConvert);
                serviceModelDartString.AppendLine();
            }
            serviceModelDartString.AppendLine(dartStringInfo);
            return serviceModelDartString.ToString();
        }

        public string GetServiceDartString()
        {
            var serviceDartString = new StringBuilder();
            var importServiceList = new List<string>();
            foreach (var methodMap in MethodMapList)
            {
                string importService = null;
                foreach (var modelType in methodMap.ParameterModeTypes)
                {
                    if (modelType is ComplexModelType)
                    {
                        importService = CodeGenerator.AlreadyGeneratedList.FirstOrDefault(x => x.Key.ParameterType.Name == modelType.ParameterType.Name && x.Key.ParameterType.Namespace == modelType.ParameterType.Namespace).Value;
                        if (importService == null)
                        {
                            throw new Exception("Import Service is null");
                        }
                        if (importService != _serviceName && !importServiceList.Contains(importService))
                        {
                            importServiceList.Add(importService);
                        }
                    }
                }
                var returnModelType = methodMap.ReturnParameterModelType;
                if (returnModelType is ComplexModelType)
                {
                    importService = CodeGenerator.AlreadyGeneratedList.FirstOrDefault(x => x.Key.ParameterType.Name == returnModelType.ParameterType.Name && x.Key.ParameterType.Namespace == returnModelType.ParameterType.Namespace).Value;
                    if (importService == null)
                    {
                        throw new Exception("Import Service is null");
                    }
                    if (importService != _serviceName && !importServiceList.Contains(importService))
                    {
                        importServiceList.Add(importService);
                    }
                }
                else if (returnModelType is ListModelType listModelType)
                {
                    var subReturnType = listModelType.GenericArgumentModelType;
                    if (subReturnType is ComplexModelType)
                    {
                        importService = CodeGenerator.AlreadyGeneratedList.FirstOrDefault(x => x.Key.ParameterType.Name == subReturnType.ParameterType.Name && x.Key.ParameterType.Namespace == subReturnType.ParameterType.Namespace).Value;
                        if (importService == null)
                        {
                            throw new Exception("Import Service is null");
                        }
                        if (importService != _serviceName && !importServiceList.Contains(importService))
                        {
                            importServiceList.Add(importService);
                        }
                    }
                }
                else if (returnModelType is ArrayModelType arrayModelType)
                {
                    var subReturnType = arrayModelType.Child;
                    if (subReturnType is ComplexModelType)
                    {
                        importService = CodeGenerator.AlreadyGeneratedList.FirstOrDefault(x => x.Key.ParameterType.Name == subReturnType.ParameterType.Name && x.Key.ParameterType.Namespace == subReturnType.ParameterType.Namespace).Value;
                        if (importService == null)
                        {
                            throw new Exception("Import Service is null");
                        }
                        if (importService != _serviceName && !importServiceList.Contains(importService))
                        {
                            importServiceList.Add(importService);
                        }
                    }
                }
                else if (returnModelType is DictionaryModelType dictionaryModelType)
                {
                    foreach (var subReturnType in dictionaryModelType.GenericArgumentModelTypeList)
                    {
                        if (subReturnType is ComplexModelType)
                        {
                            importService = CodeGenerator.AlreadyGeneratedList.FirstOrDefault(x => x.Key.ParameterType.Name == subReturnType.ParameterType.Name && x.Key.ParameterType.Namespace == subReturnType.ParameterType.Namespace).Value;
                            if (importService == null)
                            {
                                throw new Exception("Import Service is null");
                            }
                            if (importService != _serviceName && !importServiceList.Contains(importService))
                            {
                                importServiceList.Add(importService);
                            }
                        }
                    }
                }
            }

            var complexReturnTypeNameList = GetUserDefinedComplexReturnTypeList();
            foreach (var complexReturnTypeName in complexReturnTypeNameList)
            {
                string importService;
                if (complexReturnTypeName.Contains("<"))
                {
                    var returnTypeName = complexReturnTypeName.Substring(0, complexReturnTypeName.IndexOf("<"));
                    importService = CodeGenerator.AlreadyGeneratedList.FirstOrDefault(x => x.Key.ParameterType.Name[0..^2] == returnTypeName).Value;
                }
                else
                {
                    importService = CodeGenerator.AlreadyGeneratedList.FirstOrDefault(x => x.Key.ParameterType.Name == complexReturnTypeName).Value;
                }
                if (importService == null)
                {
                    throw new Exception("Import Service is null");
                }
                if (importService != _serviceName && !importServiceList.Contains(importService))
                {
                    importServiceList.Add(importService);
                }
            }

            foreach (var importService in importServiceList)
            {
                serviceDartString.AppendLine($"import '{LetterConverterHelper.FirstCharToLower(importService[0..^7])}.m.dart';");
            }
            if (importServiceList.Count > 0)
            {
                serviceDartString.AppendLine();
            }

            serviceDartString.AppendLine();
            serviceDartString.AppendLine($"class {_serviceName} extends JsonRpcClientBase {{");
            serviceDartString.AppendLine($"\t{_serviceName}(");
            serviceDartString.AppendLine("\t\tString host, {");
            serviceDartString.AppendLine($"\t\tString serviceName = \"I{_serviceName}\",");
            serviceDartString.AppendLine("\t\tMap<String, String>? headers,");
            serviceDartString.AppendLine("\t\tint? timeout,");
            serviceDartString.AppendLine("\t}) : super(");
            serviceDartString.AppendLine("\t\t\t\t\t\thost,");
            serviceDartString.AppendLine("\t\t\t\t\t\tserviceName,");
            serviceDartString.AppendLine("\t\t\t\t\t\theaders: headers,");
            serviceDartString.AppendLine("\t\t\t\t\t\ttimeout: timeout,");

            if (complexReturnTypeNameList.Count() == 0)
            {
                serviceDartString.AppendLine("\t\t\t\t);");
            }
            else
            {
                serviceDartString.AppendLine("\t\t\t\t) {");
                serviceDartString.AppendLine("\t\t/// 注册响应实体反序列化处理器");
                foreach (var complexRetrunTypeName in complexReturnTypeNameList)
                {
                    serviceDartString.AppendLine($"\t\tFJsonConvert.setDecoder((map) => {complexRetrunTypeName}.fromJson(map));");
                }
                serviceDartString.AppendLine("\t}");
            }
            serviceDartString.AppendLine();
            foreach (var methodMap in MethodMapList)
            {
                serviceDartString.AppendLine(methodMap.GetMethodDartString());
            }

            serviceDartString.AppendLine("}");

            return serviceDartString.ToString();
        }

        public List<string> GetUserDefinedComplexReturnTypeList()
        {
            _userDefinedComplexReturnTypeList = new List<string>();
            foreach (var method in MethodMapList)
            {
                var veturnParameterModelType = method.ReturnParameterModelType;
                AddUserDefinedComplexReturnType(veturnParameterModelType);
            }
            return _userDefinedComplexReturnTypeList;
        }

        private void AddUserDefinedComplexReturnType(ModelType modelType)
        {
            if (modelType is UserDefinedModeType)
            {
                if (!_userDefinedComplexReturnTypeList.Contains(modelType.GetFlutterTypeName()))
                {
                    _userDefinedComplexReturnTypeList.Add(modelType.GetFlutterTypeName());
                }
            }
            else if (modelType is UserDefinedDerivedModelType)
            {
                if (!_userDefinedComplexReturnTypeList.Contains(modelType.GetFlutterTypeName()))
                {
                    _userDefinedComplexReturnTypeList.Add(modelType.GetFlutterTypeName());
                }
            }
            else if (modelType is UserDefinedGenericModelType userDefinedGenericComplexModelType)
            {
                if (!_userDefinedComplexReturnTypeList.Contains(userDefinedGenericComplexModelType.GetFlutterTypeName()))
                {
                    _userDefinedComplexReturnTypeList.Add(userDefinedGenericComplexModelType.GetFlutterTypeName());
                }
                var argumentModelType = userDefinedGenericComplexModelType.GenericArgumentModelType;
                AddUserDefinedComplexReturnType(argumentModelType);
            }
            else if (modelType is ListModelType listModelType)
            {
                var argumentModelType = listModelType.GenericArgumentModelType;
                AddUserDefinedComplexReturnType(argumentModelType);
            }
            else if (modelType is DictionaryModelType dictionaryModelType)
            {
                foreach (var argumentModelType in dictionaryModelType.GenericArgumentModelTypeList)
                {
                    AddUserDefinedComplexReturnType(argumentModelType);
                }
            }
        }
    }
}