//
// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
//

using System;
using System.Threading.Tasks;
using Microsoft.SqlTools.Hosting.Protocol.Contracts;
using Error = Microsoft.SqlTools.Hosting.Contracts.Error;

namespace Microsoft.SqlTools.Hosting.Protocol
{
    public class RequestContext<TResult> : IEventSender
    {
        private readonly Message requestMessage;
        private readonly MessageWriter messageWriter;

        public RequestContext(Message requestMessage, MessageWriter messageWriter)
        {
            this.requestMessage = requestMessage;
            this.messageWriter = messageWriter;
        }

        public RequestContext() { }

        public virtual async Task SendResult(TResult resultDetails)
        {
            await this.messageWriter.WriteResponse(
                resultDetails,
                requestMessage.Method,
                requestMessage.Id);
        }

        public virtual async Task SendEvent<TParams>(EventType<TParams> eventType, TParams eventParams)
        {
            await this.messageWriter.WriteEvent(
                eventType,
                eventParams);
        }

        public virtual Task SendError(string errorMessage, int errorCode = 0)
        {
            // Build the error message
            Error error = new Error
            {
                Message = errorMessage,
                Code = errorCode
            };
            return this.messageWriter.WriteError(
                    requestMessage.Method,
                    requestMessage.Id,
                    error);
        }

        public virtual Task SendError(Exception e)
        {
            // Overload to use the parameterized error handler
            return SendError(e.Message, e.HResult);
        }
    }
}