using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;

namespace Mogafa.App.Behaviours
{
    public delegate void UserBehaviourChangedHandler(string code, long newValue, long oldValue);
    public class UserBehaviour
    {
        public event UserBehaviourChangedHandler BehaviourChanged;
        public UserBehaviour()
        {
            Behaviours = new List<Behaviour>();
        }
        private string userId;
        [JsonProperty("userId")]
        public string UserId
        {
            get
            {
                return userId;
            }
            set
            {
                userId = value;
            }
        }
        [JsonProperty("behaviours")]
        public List<Behaviour> Behaviours { get; set; }
        public long GetBehaviour(string code)
        {
            var behaviour = Behaviours.FirstOrDefault(b => b.Code == code);
            if(behaviour == null)
            {
                return 0L;
            }
            return behaviour.Value;
        }

        public long Add(string code, long value)
        {
            var behaviour = Behaviours.FirstOrDefault(b => b.Code == code);
            if (behaviour == null)
            {
                behaviour = new Behaviour
                {
                    Code = code,
                    Value = 0L
                };
                Behaviours.Add(behaviour);
            }
            var oldValue = behaviour.Value;
            behaviour.Value += value;
            if(value > 0)
            {
                BehaviourChanged?.Invoke(code, oldValue, behaviour.Value);
            }
            return behaviour.Value;
        }
    }
}