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using Google.Protobuf;
using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.Core.ExtensionMethods;
using Tango.PMR;
using Tango.PMR.Common;

namespace Tango.DataStore
{
    /// <summary>
    /// Contains data store helper methods.
    /// </summary>
    public static class DataStoreHelper
    {
        /// <summary>
        /// Gets the data store data type by the specified object type.
        /// </summary>
        /// <param name="value">The value.</param>
        /// <returns></returns>
        public static DataType GetDataType(Object value)
        {
            return GetDataType(value.GetType());
        }

        /// <summary>
        /// Gets data store data type by the specified .net type.
        /// </summary>
        /// <param name="type">The type.</param>
        /// <returns></returns>
        /// <exception cref="System.NotSupportedException"></exception>
        public static DataType GetDataType(Type type)
        {
            if (type == typeof(int))
            {
                return DataType.Int32;
            }
            else if (type == typeof(Int64))
            {
                return DataType.Int32;
            }
            else if (type == typeof(float))
            {
                return DataType.Float;
            }
            else if (type == typeof(double))
            {
                return DataType.Double;
            }
            else if (type == typeof(String))
            {
                return DataType.String;
            }
            else if (type == typeof(bool))
            {
                return DataType.Boolean;
            }
            else if (type == typeof(byte[]))
            {
                return DataType.Bytes;
            }
            else if (type == typeof(DataStoreProtoObject))
            {
                return DataType.Proto;
            }
            else if (typeof(IMessage).IsAssignableFrom(type))
            {
                return DataType.Proto;
            }

            throw new NotSupportedException($"The specified type '{type.Name}' is not supported by the data store.");
        }

        /// <summary>
        /// Formats the data store item as a string.
        /// </summary>
        /// <param name="item">The item.</param>
        /// <returns></returns>
        public static String FormatDataStoreItem(IDataStoreItem item)
        {
            if (item.Type == DataType.Bytes)
            {
                byte[] bytes = (byte[])item.Value;

                StringBuilder hex = new StringBuilder();
                foreach (byte b in bytes)
                {
                    hex.AppendFormat("{0:x2} ", b);
                }
                return hex.ToString();
            }
            else if (item.Type == DataType.Proto)
            {
                return (item.Value as DataStoreProtoObject).Message.ToJsonString();
            }
            else
            {
                return $"{item.Key}: {item.Value}";
            }
        }
    }
}