using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Convention.RScript.Variable.CStyle
{
    public class RScriptVariableGenerater : RScriptInjectVariableGenerater
    {
        public static string GetTypename(Type type)
        {
            var name = type.Name.Replace('`', '_');
            return name;
        }

        private int layer = 0;
        private string Prefix => new('\t', layer);

        public RScriptVariableGenerater(Type targetType, [MaybeNull] Generater generater, string name) : base(targetType, generater, name)
        {
        }

        protected override string WriteClassBodyEnter(Type currentType)
        {
            string result = $"{Prefix}{"{public:"}";
            layer++;
            return result;
        }

        protected override string WriteClassBodyExit(Type currentType)
        {
            layer--;
            return $"{Prefix}{"{"}";
        }

        protected override string WriteClassHead(Type currentType)
        {
            string suffix = currentType.BaseType == typeof(object) ? string.Empty : $" : public {GetTypename(currentType.BaseType)}";
            string result = $"{Prefix}class {GetTypename(currentType)}{suffix}";
            layer++;
            return result;
        }

        protected override string WriteClassMethod(Type returnType, string methodName, string[] parameterNames, Type[] parameterTypes)
        {
            List<string> parameters = new();
            for(int i=0,e=parameterNames.Length;i<e;i++)
            {
                parameters.Add($"{GetTypename(parameterTypes[i])} {parameterNames[i]}");
            }
            return $"{Prefix}{GetTypename(returnType)} {methodName}({string.Join(", ", parameters)});";
        }

        protected override string WriteClassTail(Type currentType)
        {
            return "";
        }

        protected override string WriteEnumBodyEnter(Type currentType)
        {
            string result = $"{Prefix}{"{"}";
            layer++;
            return result;
        }

        protected override string WriteEnumBodyExit(Type currentType)
        {
            layer--;
            return $"{Prefix}{"{"}";
        }

        protected override string WriteEnumHead(Type currentEnum)
        {
            return $"{Prefix}enum {GetTypename(currentEnum)}";
        }

        protected override string WriteEnumName(string enumName)
        {
            return $"{Prefix}{enumName},";
        }

        protected override string WriteEnumTail(Type currentType)
        {
            return "";
        }

        protected override string WritePageEnd(Type currentType)
        {
            return "";
        }

        protected override string WritePageHead(Type currentType)
        {
            return $"#include\"{GetFilename(currentType)}\"";
        }

        public override string GetFilename(Type currentType)
        {
            return GetTypename(currentType);
        }
    }
}