using System;
using MxGateway.Contracts;
using MxGateway.Worker.Bootstrap;

namespace MxGateway.Worker.Ipc;

public sealed class WorkerFrameProtocolOptions
{
    public const int DefaultMaxMessageBytes = 16 * 1024 * 1024;

    public WorkerFrameProtocolOptions(WorkerOptions options)
        : this(
            options?.SessionId ?? throw new ArgumentNullException(nameof(options)),
            options.ProtocolVersion,
            options.Nonce,
            DefaultMaxMessageBytes)
    {
    }

    public WorkerFrameProtocolOptions(
        string sessionId,
        uint protocolVersion,
        string nonce)
        : this(
            sessionId,
            protocolVersion,
            nonce,
            DefaultMaxMessageBytes)
    {
    }

    public WorkerFrameProtocolOptions(
        string sessionId,
        uint protocolVersion,
        string nonce,
        int maxMessageBytes)
    {
        if (string.IsNullOrWhiteSpace(sessionId))
        {
            throw new WorkerFrameProtocolException(
                WorkerFrameProtocolErrorCode.InvalidConfiguration,
                "Worker frame protocol requires a session id.");
        }

        if (protocolVersion == 0)
        {
            throw new WorkerFrameProtocolException(
                WorkerFrameProtocolErrorCode.InvalidConfiguration,
                "Worker frame protocol requires a non-zero protocol version.");
        }

        if (protocolVersion != GatewayContractInfo.WorkerProtocolVersion)
        {
            throw new WorkerFrameProtocolException(
                WorkerFrameProtocolErrorCode.ProtocolVersionMismatch,
                $"Worker frame protocol version {protocolVersion} is not supported.");
        }

        if (string.IsNullOrWhiteSpace(nonce))
        {
            throw new WorkerFrameProtocolException(
                WorkerFrameProtocolErrorCode.InvalidConfiguration,
                "Worker frame protocol requires a nonce.");
        }

        if (maxMessageBytes <= 0)
        {
            throw new WorkerFrameProtocolException(
                WorkerFrameProtocolErrorCode.InvalidConfiguration,
                "Worker frame protocol max message size must be greater than zero.");
        }

        SessionId = sessionId;
        ProtocolVersion = protocolVersion;
        Nonce = nonce;
        MaxMessageBytes = maxMessageBytes;
    }

    public string SessionId { get; }

    public uint ProtocolVersion { get; }

    public string Nonce { get; }

    public int MaxMessageBytes { get; }
}