namespace Admin.NET.Plugin.ApprovalFlow.Service;

/// <summary>
/// 审批流通知推送器抽象（P4-16）
/// 每种渠道一个实现，注册到 DI 容器，由 FlowNotifyService 按配置 + 启用状态并行调度。
/// </summary>
public interface INotifyPusher
{
    /// <summary>
    /// 渠道名（SignalR / Email / Sms / DingTalk / WorkWeixin），与 NotifyChannelConfig 属性名一致
    /// </summary>
    string Channel { get; }

    /// <summary>
    /// 根据配置判断当前渠道是否启用
    /// </summary>
    bool IsEnabled(NotifyChannelConfig cfg);

    /// <summary>
    /// 实际推送
    /// </summary>
    /// <param name="userIds">目标用户 Id 列表（SignalR/Email/Sms 直接定位人；DingTalk/WorkWeixin Webhook 忽略，由群机器人向群成员广播）</param>
    /// <param name="notification">通知载荷</param>
    /// <returns>推送结果（含是否成功、目标数、耗时、错误）</returns>
    Task<FlowNotifyPushResult> PushAsync(List<long> userIds, FlowNotification notification);
}

/// <summary>
/// 单次推送结果
/// </summary>
public class FlowNotifyPushResult
{
    public bool Success { get; set; }
    public int ActualTargetCount { get; set; }
    public string? ErrorMessage { get; set; }

    public static FlowNotifyPushResult Ok(int count) => new() { Success = true, ActualTargetCount = count };
    public static FlowNotifyPushResult Fail(string error) => new() { Success = false, ErrorMessage = error };
}