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.Dict;

public class DictSyncCoordinator : ISingletonDependency
{
    private readonly IEventAggregator _eventAggregator;
    private readonly IJeecgDictSyncService _dictSyncService;
    private readonly ILoggerService _logger;

    public DictSyncCoordinator(
        IEventAggregator eventAggregator,
        IJeecgDictSyncService dictSyncService,
        SyncPollManager pollManager,
        ILoggerService logger)
    {
        _eventAggregator = eventAggregator;
        _dictSyncService = dictSyncService;
        _logger = logger;

        _eventAggregator.GetEvent<RemoteCommandReceivedEvent>()
            .Subscribe(OnRemoteCommand, ThreadOption.BackgroundThread);
        _eventAggregator.GetEvent<NetworkStatusChangedEvent>()
            .Subscribe(OnNetworkStatusChanged, ThreadOption.BackgroundThread);

        pollManager.Register("数据字典", () => SyncAndPublishAsync("poll", null));

        _logger.Information("[数据字典] DictSyncCoordinator 已启动");
        _ = Task.Run(() => SyncAndPublishAsync("startup", null));
    }

    private void OnNetworkStatusChanged(NetworkStatusChangedPayload payload)
    {
        if (!payload.IsOnline) return;
        _logger.Information("[数据字典] 网络恢复，触发补偿刷新");
        _ = Task.Run(() => SyncAndPublishAsync("reconnect", null));
    }

    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;
            if (!cmdEl.GetString().Equals("SYS_DICT_CHANGED", StringComparison.OrdinalIgnoreCase)) return;

            doc.RootElement.TryGetProperty("action", out var actionEl);
            doc.RootElement.TryGetProperty("dictId", out var idEl);
            var action = actionEl.GetString() ?? string.Empty;
            var dictId = idEl.ValueKind == JsonValueKind.String ? idEl.GetString() : null;

            _logger.Information($"[数据字典] 收到变更信号 action={action}");
            _ = Task.Run(() => SyncAndPublishAsync(action, dictId));
        }
        catch (Exception ex)
        {
            _logger.Warning($"[数据字典] 处理STOMP命令失败：{ex.Message}");
        }
    }

    private async Task SyncAndPublishAsync(string action, string? dictId)
    {
        try
        {
            var count = await _dictSyncService.SyncFromJeecgAsync().ConfigureAwait(false);
            if (count > 0)
                _logger.Information($"[数据字典] 同步完成，共处理 {count} 条");

            _eventAggregator.GetEvent<DictChangedEvent>()
                .Publish(new DictChangedPayload { Action = action, DictId = dictId });
        }
        catch (Exception ex)
        {
            _logger.Warning($"[数据字典] 同步失败：{ex.Message}");
        }
    }
}