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

namespace CoderEngine
{
    public class SwiftCodeWrite
    {
        private string CodeStr = "";

        /// <summary>
        /// 一个代码缩进
        /// </summary>
        private string tabstr = "    ";

        /// <summary>
        /// 逐行添加代码
        /// </summary>
        /// <param name="codeline"></param>
        /// <returns></returns>
        public void CoderAddLine(string CodeLine)
        {
            CodeStr += CodeLine + "\n";
        }

        public string ModelToSwiftCode(string _AssemblyName, string _TypeName)
        {
            TypeMode tm = new _ModleReader().ModelCheck(_AssemblyName, _TypeName);
            ModelToJavaCodeWriter(tm);
            return CodeStr;
        }

        public void ModelToJavaCodeWriter(TypeMode TopMode)
        {
            //如果有代码嵌套的下级类 在本类外 写入新的类
            if (TopMode.TypeList != null && TopMode.TypeList.Count > 0)
            {
                CoderAddLine(tabstr);
                CoderAddLine("import Foundation");
                CoderAddLine("import ObjectMapper");
                SwitchCodeDownRecursion(TopMode);
            }
        }


        public void SwitchCodeDownRecursion(TypeMode TopMode)
        {
            string ClassName = "";
            //如果自己就是集合类型 则取类型下名字
            if (TopMode.MemberType.Name == "List`1")
            {
                //FullName的值为 "System.Collections.Generic.List`1[[  --集合内嵌类型名称--, CoderEngine, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]"
                //其中包含内嵌List的名称 我们要将其取出  得到的值例如 “程序集.*.*类型”
                var SonParamName = TopMode.MemberType.FullName.Substring(TopMode.MemberType.FullName.IndexOf("[") + 2);
                SonParamName = SonParamName.Substring(0, SonParamName.IndexOf(","));
                ClassName = SonParamName.Substring(SonParamName.LastIndexOf(".") + 1);
            }
            else
                ClassName = TopMode.MemberType.Name;


            CoderAddLine("");
            CoderAddLine("class "+ClassName+": Mappable {");
            foreach (var tl in TopMode.TypeList)
            {
                CoderAddLine("");
                if (tl.MemberType.Name == "List`1")
                {
                    //如果集合类型的特殊对待？ 貌似Swift没有
                }
                else
                {

                }
                
                CoderAddLine(tabstr + "var "+ tl.Name + ": "+ CSharpToSwiftTypeName(tl.MemberType) + " = "+ GetDefaultValueForType(tl.MemberType));
            }

            CoderAddLine("");
            CoderAddLine(tabstr + "required init?(map: Map) {");
            CoderAddLine("");
            CoderAddLine(tabstr + "}");
            CoderAddLine("");
            CoderAddLine(tabstr + "//为" + ClassName + "生成mapping方法");
            CoderAddLine(tabstr + "func mapping(map: Map) {");
            CoderAddLine("");
            foreach (var tl in TopMode.TypeList)
            {
                CoderAddLine(tabstr + tabstr + tl.Name + " <- map[\""+ tl.Name + "\"]");
            }

            CoderAddLine(tabstr + "}");

            CoderAddLine("}");
            
            foreach (var tl in TopMode.TypeList)
            {
                if (tl.MemberType.Name == "List`1")
                {
                    if (tl.TypeList != null && tl.TypeList.Count > 0)
                    {
                        CoderAddLine("");
                        SwitchCodeDownRecursion(tl);
                    }
                }
            }

        }
        

        public string GetDefaultValueForType(Type myType)
        {
            switch (CSharpToSwiftTypeName(myType))
            {
                case "Int":
                    return "0";
                case "Double":
                    return "0";
                case "Bool":
                    return "Bool";
                case "String":
                    return "\"\"";
                default:
                    {
                        if (CSharpToSwiftTypeName(myType).Contains("["))
                        {
                            return "[]";
                        }
                        else
                            return "\"\"";
                    }
            }
        }

        public string CSharpToSwiftTypeName(Type myType)
        {
            var oneinfo = CSharpToSwiftTypeItem.Where(w => w.Key == myType.Name).FirstOrDefault();
            if (oneinfo.Value != null)
            {
                return oneinfo.Value;
            }
            else
            {
                if (myType.Name == "List`1")
                {
                    var SonParamName = myType.FullName.Substring(myType.FullName.IndexOf("[") + 2);
                    SonParamName = SonParamName.Substring(0, SonParamName.IndexOf(","));
                    return "[" + SonParamName.Substring(SonParamName.LastIndexOf('.') + 1) + "]";
                }
                else if (myType.Name == "Nullable`1")
                {
                    var SonParamName = myType.FullName.Substring(myType.FullName.IndexOf("[") + 2);
                    SonParamName = SonParamName.Substring(0, SonParamName.IndexOf(","));
                    return SonParamName.Substring(SonParamName.LastIndexOf('.') + 1);
                }
                else
                    return "String";
            }
        }
        
        /// <summary>
        /// C#和Swift类型对照表
        /// </summary>
        public System.Collections.Generic.Dictionary<string, string> CSharpToSwiftTypeItem =
            new Dictionary<string, string>() {
                { "int","Int"},
                { "Int16","Int"},
                { "Int32","Int"},
                { "Int64","Int"},
                { "int?","Int"},
                { "long","Int"},
                { "long?","Int"},
                { "float","Double"},
                { "float?","Double"},
                { "double","Double"},
                { "double?","Double"},
                { "boolean","Bool"},
                { "string","String"},
                { "DateTime","String"},
                { "DateTime?","String"},
            };
    }
}