using YZWater.Core.Models;

namespace YZWater.Core.Tests.Models;

/// <summary>
/// 持续时间列的语义。
/// 报警历史里"测点读取失败""报警升级"这类记录是瞬时事件，没有恢复概念；
/// 之前它们和真报警一样按 now-AlarmTime 累加，界面上显示成"31m+"，
/// 操作员看到一整屏在无限增长的"报警"，于是问"这些是啥报警，确认又确认不了"。
/// 真报警的"进行中"计数必须保留，否则失联期间的报警看起来像已经结束。
/// </summary>
public class AlarmDurationSemanticsTests
{
    [Fact]
    public void DiaryRecord_WithoutConditionId_ShowsNoDuration()
    {
        var journal = new AlarmRecord
        {
            AlarmType = "Quality",
            AlarmMessage = "15 个测点读取失败",
            AlarmTime = DateTime.Now.AddMinutes(-30)
        };

        journal.UpdateDurationText();

        Assert.Equal("--", journal.DurationText);
    }

    [Fact]
    public void EscalationRecord_AlsoPointEvent_ShowsNoDuration()
    {
        var escalated = new AlarmRecord
        {
            AlarmType = "DI",
            AlarmMessage = "报警已升级",
            AlarmLevel = 4,
            AlarmTime = DateTime.Now.AddMinutes(-30)
        };

        escalated.UpdateDurationText();

        Assert.Equal("--", escalated.DurationText);
    }

    [Fact]
    public void ActiveAlarm_WithoutRecoverTime_StillCountsUp()
    {
        var alarm = new AlarmRecord
        {
            ConditionId = "DI_低液位报警",
            AlarmMessage = "低液位报警",
            AlarmTime = DateTime.Now.AddMinutes(-30)
        };

        alarm.UpdateDurationText();

        Assert.Contains("+", alarm.DurationText);
    }

    [Fact]
    public void RecoveredAlarm_ShowsElapsedSpan()
    {
        var start = DateTime.Now.AddMinutes(-5);
        var alarm = new AlarmRecord
        {
            ConditionId = "DI_低液位报警",
            AlarmTime = start,
            RecoverTime = start.AddSeconds(40)
        };

        alarm.UpdateDurationText();

        Assert.Equal("40s", alarm.DurationText);
    }
}