using System.Collections.Concurrent;
using System.Dynamic;

namespace OpenTap.Addin
{
    public class VariableContext : DynamicObject
    {
        private static readonly char SPLIT_MARK = '.';

        private readonly ConcurrentDictionary<string, RuntimeVariable> Variables;

        public VariableContext(ConcurrentDictionary<string, RuntimeVariable> variables)
        {
            Variables = variables;
        }

        public override bool TryGetMember(GetMemberBinder binder, out object result)
        {
            result = null;
            string name = binder.Name;
            if (Variables.TryGetValue(name, out var variable))
            {
                result = variable.data;
                return true;
            }
            return false;
        }

        public override bool TrySetMember(SetMemberBinder binder, object value)
        {
            string name = binder.Name;
            if (Variables.TryGetValue(name, out var variable))
            {
                variable.data = value;
                return true;
            }
            else
            {
                var v = new RuntimeVariable
                {
                    Name = name,
                    data = value,
                    Type = value.GetType(),
                    TypeName = value.GetType().Name,
                };
                Variables[name] = v;
                return true;
            }
        }

        public void Merge(VariableContext source)
        {
            if (source?.Variables != null)
            {
                foreach (var key in source.Variables.Keys)
                {
                    Variables[key] = source.Variables[key];
                }
            }
        }

        public void Merge(ConcurrentDictionary<string, RuntimeVariable> Variables)
        {
            if (Variables != null)
            {
                foreach (var key in Variables.Keys)
                {
                    this.Variables[key] = Variables[key];
                }
            }
        }
    }
}