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

namespace FlutterCodeGenerator.ModelTypes
{
    internal class EnumModelType : ComplexModelType
    {
        public Dictionary<int, string> UserDefinedEnumDictionary { get; }

        public EnumModelType(Type type, string name) : base(type, name)
        {
            UserDefinedEnumDictionary = new Dictionary<int, string>();
            var fields = ParameterType.GetFields();
            if (fields != null && fields.Length > 1)
            {
                for (int i = 1; i < fields.Length; i++)
                {
                    var fieldName = fields[i].GetValue(null).ToString();
                    var fieldValue = (int)fields[i].GetValue(null);
                    if (fieldValue < 0)
                    {
                        continue;
                    }
                    else
                    {
                        UserDefinedEnumDictionary.Add(fieldValue, fieldName);
                    }
                }
                UserDefinedEnumDictionary = UserDefinedEnumDictionary.OrderBy(x => x.Key).ToDictionary(p => p.Key, o => o.Value);
            }
            var firstChildName = UserDefinedEnumDictionary.FirstOrDefault().Value;
            DefaultValue = $"{GetFlutterTypeName()}.{firstChildName}";
        }

        public override string GetFlutterTypeName(bool isDefault = true, bool isGenericName = false, bool isSingle = false)
        {
            if (Index > 1)
            {
                return $"{ParameterType.Name}{Index}";
            }
            else
            {
                return $"{ParameterType.Name}";
            }
        }

        public override string GetDartString()
        {
            var dartString = new StringBuilder();
            dartString.AppendLine($"enum {GetFlutterTypeName()} {{");
            int lastValue = 0;
            foreach (var userDefinedEnum in UserDefinedEnumDictionary)
            {
                var index = userDefinedEnum.Key;
                var name = userDefinedEnum.Value;
                while (lastValue != index)
                {
                    dartString.AppendLine($"\tplaceHolder_{lastValue},");
                    lastValue++;
                }
                if (lastValue == index)
                {
                    dartString.AppendLine($"\t{name},");
                    lastValue++;
                }
            }
            dartString.AppendLine("}");
            return dartString.ToString();
        }

        protected override void ChangeIndex()
        {
            if (UserDefinedEnumDictionary != null)
            {
                var firstChildName = UserDefinedEnumDictionary.FirstOrDefault().Value;
                DefaultValue = $"{GetFlutterTypeName()}.{firstChildName}";
            }
        }
    }
}