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

namespace Cbdx
{
    internal class DataExchangeDispatcher : IDataExchangeDispatcher
    {
        private readonly Dictionary<string, Dictionary<string, ServiceActionBind>> _serviceDictionary;

        public DataExchangeDispatcher(Dictionary<string, Dictionary<string, ServiceActionBind>> serviceDictionary)
        {
            _serviceDictionary = serviceDictionary;
        }

        public string InvokeService(string service, string action, string input)
        {
            DataExchangeResultBase result;

            try
            {
                if (false == _serviceDictionary.TryGetValue(service, out var controller)) throw new EntryPointNotFoundException($"Service [{service}] not found");
                if (false == controller.TryGetValue(action, out var actionBind)) throw new EntryPointNotFoundException($"Action [{action}] on [{service}] not found");

                var ret = actionBind.Invoke(input);

                result = new DataExchangeDataResult<object> { Success = true, Data = ret };
            }
            catch (Exception ex)
            {
                result = new DataExchangeErrorResult(ex.Message, ex.StackTrace);
            }

            return JsonConvert.SerializeObject(result);
        }
    }
}