namespace DS.Module.Core.Data
{
    /// <summary>
    /// 任务模块之间用于传入、获取数据的容器
    /// </summary>
    public class TaskFlowDataContext
    {
        private readonly Dictionary<string, object?> dataContext = new();

        /// <summary>
        /// 
        /// </summary>
        public TaskFlowDataContext(string key, object? value)
        {
            dataContext.Add(key, value);
        }

        /// <summary>
        /// 
        /// </summary>
        public TaskFlowDataContext(params (string key, object? value)[] keyValues)
        {
            foreach (var item in keyValues)
            {
                dataContext.Add(item.key, item.value);
            }
        }

        public IReadOnlyCollection<string> Keys => dataContext.Keys;

        public object? this[string key]
        {
            get { return dataContext[key]; }
            set { dataContext[key] = value; }
        }

        /// <summary>
        /// 
        /// </summary>
        public void Set(string key, object? value)
        {
            if (ContainsKey(key))
            {
                dataContext[key] = value;
            }
            else
            {
                dataContext.Add(key, value);
            }
        }
        /// <summary>
        /// 
        /// </summary>
        public T? Get<T>(string key)
        {
            if (dataContext.ContainsKey(key))
            {
                var value = dataContext[key];
                if (value is T t)
                {
                    return t;
                }
                else if (value != null)
                {
                    return (T)Convert.ChangeType(value, typeof(T));
                }
            }
            return default;
        }

        /// <summary>
        /// 
        /// </summary>
        public T? GetOrDefault<T>(string key)
        {
            return GetOrDefault<T>(key, default);
        }

        /// <summary>
        /// 
        /// </summary>
        public T GetOrDefault<T>(string key, T defaultValue)
        {
            if (dataContext.TryGetValue(key, out var value))
            {
                if (value is T t)
                {
                    return t;
                }
                else if (value != null)
                {
                    return (T)Convert.ChangeType(value, typeof(T));
                }
            }

            return defaultValue;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        /// <returns></returns>
        public bool TryGetValue(string key, out object value) 
        {
            return dataContext.TryGetValue(key, out value);
        }

        /// <summary>
        /// 
        /// </summary>
        public bool ContainsKey(string key) => dataContext.ContainsKey(key);


    }
}