using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;

namespace Admin.NET.Plugin.AiDOP.DataPlatform.Executors;

/// <summary>
/// 出站总闸门。三个推送入口（事件驱动 Worker、60 秒 Job、手工重投）
/// 以及领料单号同步都汇到这里；关闭时不发送、不改 <c>mdp_outbox</c> 状态、不烧重试。
/// </summary>
public sealed class MdpOutboundGate : ISingleton
{
    public const string DisabledMessage = "出站推送已关闭，mdp_outbox 只入队不发送";

    private readonly IOptionsMonitor<AidopOutboundOptions> _options;
    private readonly ILogger _logger;
    private int _announced;
    private long _refused;

    public MdpOutboundGate(IOptionsMonitor<AidopOutboundOptions> options, ILoggerFactory loggerFactory)
    {
        _options = options;
        _logger = loggerFactory.CreateLogger(nameof(MdpOutboundGate));
    }

    public bool IsEnabled => _options.CurrentValue.Enabled;

    public long RefusedCount => Interlocked.Read(ref _refused);

    /// <summary>进程内只打一次。由启动即跑的出站 Job 调用，保证关着的时候日志里能看见。</summary>
    public void AnnounceIfDisabled()
    {
        if (IsEnabled || Interlocked.Exchange(ref _announced, 1) == 1)
            return;
        _logger.LogWarning("[MdpOutboundGate] {Message}", DisabledMessage);
    }

    /// <summary>关闭时返回 <see cref="MdpPushResult.Hold"/> 的结果；调用方不得据此改 outbox 行。</summary>
    public MdpPushResult? TryHold()
    {
        if (IsEnabled)
            return null;
        AnnounceIfDisabled();
        var n = Interlocked.Increment(ref _refused);
        if (n == 1 || n % 100 == 0)
            _logger.LogWarning("[MdpOutboundGate] {Message}；已拦截 {Count} 次", DisabledMessage, n);
        return MdpPushResult.Hold(DisabledMessage);
    }
}