using Prism.Events;
using System.Text.Json;
using YY.Admin.Core;
using YY.Admin.Core.Events;
using YY.Admin.Core.Services;

namespace YY.Admin.Services.Service.WarehouseArea;

/// <summary>
/// 监听 STOMP 收到的库区变更信号，转发为桌面端 Prism 事件，触发列表刷新。
/// </summary>
public class WarehouseAreaSyncCoordinator : ISingletonDependency
{
    private readonly IEventAggregator _eventAggregator;
    private readonly ILoggerService _logger;
    private SubscriptionToken? _remoteCommandToken;
    private SubscriptionToken? _networkStatusToken;

    public WarehouseAreaSyncCoordinator(
        IEventAggregator eventAggregator,
        SyncPollManager pollManager,
        ILoggerService logger)
    {
        _eventAggregator = eventAggregator;
        _logger = logger;

        _remoteCommandToken = _eventAggregator
            .GetEvent<RemoteCommandReceivedEvent>()
            .Subscribe(OnRemoteCommand, ThreadOption.BackgroundThread);

        _networkStatusToken = _eventAggregator
            .GetEvent<NetworkStatusChangedEvent>()
            .Subscribe(OnNetworkStatusChanged, ThreadOption.BackgroundThread);

        pollManager.Register("库区", () =>
        {
            _eventAggregator.GetEvent<WarehouseAreaChangedEvent>()
                .Publish(new WarehouseAreaChangedPayload { Action = "poll" });
            return Task.CompletedTask;
        });

        _logger.Information("[库区推送] WarehouseAreaSyncCoordinator 已启动");
    }

    private void OnNetworkStatusChanged(NetworkStatusChangedPayload payload)
    {
        if (!payload.IsOnline) return;
        _logger.Information("[库区推送] 网络恢复，触发补偿刷新");
        _eventAggregator.GetEvent<WarehouseAreaChangedEvent>().Publish(new WarehouseAreaChangedPayload { Action = "reconnect" });
    }

    private void OnRemoteCommand(RemoteCommandPayload payload)
    {
        try
        {
            var json = payload.CommandJson ?? string.Empty;
            if (string.IsNullOrWhiteSpace(json)) return;

            using var doc = JsonDocument.Parse(json);
            if (!doc.RootElement.TryGetProperty("cmd", out var cmdEl)) return;

            var cmd = cmdEl.GetString() ?? string.Empty;
            if (!cmd.Equals("MES_WAREHOUSE_AREA_CHANGED", StringComparison.OrdinalIgnoreCase))
            {
                _logger.Information($"[库区推送] 非库区命令 cmd={cmd}，忽略");
                return;
            }

            doc.RootElement.TryGetProperty("action", out var actionEl);
            doc.RootElement.TryGetProperty("warehouseAreaId", out var idEl);

            var changedPayload = new WarehouseAreaChangedPayload
            {
                Action = actionEl.GetString() ?? string.Empty,
                WarehouseAreaId = idEl.ValueKind == JsonValueKind.String ? idEl.GetString() : null,
            };

            _logger.Information($"收到库区变更信号: action={changedPayload.Action}, warehouseAreaId={changedPayload.WarehouseAreaId}");
            _eventAggregator.GetEvent<WarehouseAreaChangedEvent>().Publish(changedPayload);
        }
        catch (Exception ex)
        {
            _logger.Warning($"处理 STOMP 库区变更信号失败: {ex.Message}");
        }
    }
}