using System;
using System.Text;
using System.Collections.Generic;
using System.Dynamic;
using ln.collections;
using ln.json.mapping;

namespace ln.json
{
	public class JSONObject : JSONValue
	{
        public IEnumerable<string> Keys => values.Keys;

        public override IEnumerable<JSONValue> Children => values.Values;
        public override bool HasChildren => true;

        public int Count => values.Count;

        BTree<string, JSONValue> values = new BTree<string, JSONValue>();

		public JSONObject()
			:base(JSONValueType.OBJECT){}

        public override JSONValue this[string property]
        {
            get => values[property];
            set => values[property] = value;
        }

        public JSONObject Add(string propertyName, JSONValue value)
        {
            values[propertyName] = value;
            return this;
        }
        public JSONObject Add(string propertyName, object value)
        {
            if (JSONMapper.DefaultMapper.Serialize(value,out JSONValue jsonValue))
            {
                values[propertyName] = jsonValue;
            }
            return this;
        }

        public void Remove(string propertyName) => values.Remove(propertyName);

        public bool ContainsKey(string key)
        {
            return values.ContainsKey(key);
        }

        public bool TryGetValue(string key, out JSONValue jsonValue) => values.TryGet(key, out jsonValue);

        public bool TryGetValue<OT>(string key, out OT value) where OT : JSONValue
        {
            if (TryGetValue(key, out JSONValue jsonValue) && (jsonValue is OT otValue))
            {
                value = otValue;
                return true;
            }
            
            value = default;
            return false;
        }
        
        public T ToObject<T>()
        {
            if (JSONMapper.DefaultMapper.Deserialize(this, typeof(T), out object o))
            {
                return (T)o;
            }
            throw new NotSupportedException();
        }

        public override JSONValue Clone()
        {
            JSONObject copy = new JSONObject();
            foreach (var key in Keys)
                copy[key] = this[key].Clone();
            return copy;
        }

        public override string ToString()
        {
            StringBuilder sb = new StringBuilder();
            sb.Append('{');

            IEnumerator<string> kenum = values.Keys.GetEnumerator();
            if (kenum.MoveNext())
                do
                {
                    sb.Append('"');
                    sb.Append(kenum.Current);
                    sb.Append('"');
                    sb.Append(':');
                    sb.Append(values[kenum.Current].ToString());

                    if (!kenum.MoveNext())
                        break;
                    sb.Append(',');
                } while (true);

            sb.Append('}');
            return sb.ToString();
        }

        public override bool TryGetMember(GetMemberBinder binder, out object? result)
        {
            if (values.TryGet(binder.Name, out JSONValue jsonValue))
            {
                result = jsonValue;
                return true;
            }
            result = null;
            return true;
        }

        public override bool TrySetMember(SetMemberBinder binder, object? value)
        {
            if (value is JSONValue jsonValue)
                values[binder.Name] = jsonValue;
            else
                values[binder.Name] = JSONMapper.DefaultMapper.ToJson(value);
            
            return true;
        }


        public static JSONObject From(object value)
        {
            if (JSONMapper.DefaultMapper.Serialize(value, out JSONValue json))
            {
                return (JSONObject)json;
            }
            throw new NotSupportedException();
        }

    }


}