@page "/instanser/{Name}"
@inject InsightRepository Repository
@inject Display Display

@if (_instance is null)
{
    <PageTitle>Ukendt instans · SQLInsight Pro</PageTitle>
    <h1>Ukendt instans</h1>
    <p>Der findes ingen instans med navnet <strong>@Name</strong>.</p>
    return;
}

<PageTitle>@_instance.Name · SQLInsight Pro</PageTitle>

<p class="crumbs"><a href="/">Instanser</a> / @_instance.Name</p>
<h1>@_instance.Name</h1>
<p class="lead">
    @_instance.ServerName · @Display.Release(_instance.ProductVersion, _instance.EngineEdition) (@_instance.ProductVersion @_instance.ProductLevel @_instance.ProductUpdateLevel) · @_instance.Edition
    · sidst set @Display.Ago(_instance.LastSeenAt)
</p>

@if (_instance.IsFailing)
{
    <div class="alert">
        <strong>Seneste forsøg på at nå instansen fejlede</strong> (@Display.Time(_instance.LastErrorAt)):
        <pre>@_instance.LastError</pre>
    </div>
}
@if (_instance.UsedLegacyFallback)
{
    <div class="alert warn">Forbindelsen bruger legacy ODBC-laget, fordi instansen er for gammel til SqlClient. Krypteringen kan være svagere.</div>
}

<section class="card">
    <div class="card-head"><h2>Aktive fund</h2><span class="muted">@_findings.Count fund</span></div>
    <FindingList Findings="_findings" Empty="Ingen aktive fund." />
</section>

<div class="section-head">
    <h2 class="section">Belastning, seneste 24 timer</h2>
    <a class="button" href="@AnalysisUrl(null)">Analysér et tidsrum</a>
</div>
<div class="grid2">
    <div class="panel"><Sparkline Points="_cpuSql" Label="SQL Server CPU" Unit=" %" Max="100" /></div>
    <div class="panel"><Sparkline Points="_cpuOther" Label="CPU brugt af andre processer" Unit=" %" Max="100" Empty="kan ikke måles på Linux, eller endnu ikke nok målinger." /></div>
    <div class="panel"><Sparkline Points="_batches" Label="Batch requests pr. sekund" Decimals="1" /></div>
    <div class="panel"><Sparkline Points="_ple" Label="Page life expectancy (s)" /></div>
</div>

<section class="card section">
<div class="card-head"><h2>Største ventetider, seneste 24 timer</h2><span class="muted">uden harmløse baggrundsventetider</span></div>
@if (_waits.Count == 0)
{
    <p class="muted">Endnu ikke nok målinger (ventetider kræver to målinger).</p>
}
else
{
    var total = Math.Max(1, _waits.Sum(w => w.WaitTimeMs));
    <table>
        <thead><tr><th>Wait type</th><th>Kategori</th><th class="num">Ventetid</th><th class="num">Andel</th><th class="num">Gns. pr. wait</th><th class="num">Signal</th></tr></thead>
        <tbody>
            @foreach (var w in _waits)
            {
                <tr>
                    <td class="mono">@w.WaitType</td>
                    <td>@w.Category</td>
                    <td class="num">@Display.Number(w.WaitTimeMs / 1000.0, 1) s</td>
                    <td class="num"><meter min="0" max="1" value="@(((double)w.WaitTimeMs / total).ToString("0.###", System.Globalization.CultureInfo.InvariantCulture))"></meter> @Display.Number(100.0 * w.WaitTimeMs / total) %</td>
                    <td class="num">@Display.Number(w.WaitingTasks == 0 ? 0 : (double)w.WaitTimeMs / w.WaitingTasks, 1) ms</td>
                    <td class="num">@Display.Number(w.WaitTimeMs == 0 ? 0 : 100.0 * w.SignalWaitTimeMs / w.WaitTimeMs) %</td>
                </tr>
            }
        </tbody>
    </table>
}
</section>

<section class="card">
<div class="card-head"><h2>Diskhastighed pr. drev, seneste 24 timer</h2></div>
<DiskTable Disks="_disks" Empty="Endnu ingen målinger pr. drev (kræver to målinger efter opgradering til 1.0.5)." />
@if (_diskSeries.Count > 0)
{
    <div class="grid2">
        @foreach (var s in _diskSeries.Take(6))
        {
            <div class="panel"><Sparkline Points="s.MbPerSecond" Label="@($"{s.Volume} MB/s")" Decimals="1" /></div>
            <div class="panel"><Sparkline Points="s.LatencyMs" Label="@($"{s.Volume} gns. latens (ms)")" Decimals="1" /></div>
        }
    </div>
}
</section>

<section class="card">
<div class="card-head"><h2>I/O-latens pr. fil, seneste 24 timer</h2></div>
@if (_files.Count == 0)
{
    <p class="muted">Endnu ikke nok målinger.</p>
}
else
{
    <table>
        <thead><tr><th>Database</th><th>Fil</th><th>Type</th><th class="num">Læsninger</th><th class="num">Gns. læs</th><th class="num">Skrivninger</th><th class="num">Gns. skriv</th></tr></thead>
        <tbody>
            @foreach (var f in _files.Take(25))
            {
                <tr>
                    <td>@f.DatabaseName</td>
                    <td>@f.FileId</td>
                    <td>@f.FileType</td>
                    <td class="num">@Display.Number(f.Reads)</td>
                    <td class="num @LatencyClass(f.AverageReadMs, f.FileType == "LOG" ? 20 : 20)">@Ms(f.AverageReadMs)</td>
                    <td class="num">@Display.Number(f.Writes)</td>
                    <td class="num @LatencyClass(f.AverageWriteMs, f.FileType == "LOG" ? 5 : 20)">@Ms(f.AverageWriteMs)</td>
                </tr>
            }
        </tbody>
    </table>
}
</section>

<div class="grid2">
    <section class="card">
        <div class="card-head"><h2>Blocking, seneste 24 timer</h2></div>
        @if (_blocking.Count == 0)
        {
            <p class="muted">Ingen blocking over 5 sekunder.</p>
        }
        else
        {
            <table>
                <thead><tr><th>Tidspunkt</th><th>Head blocker</th><th class="num">Blokerede</th><th class="num">Længste</th></tr></thead>
                <tbody>
                    @foreach (var b in _blocking.Take(20))
                    {
                        var head = b.Sessions.FirstOrDefault();
                        <tr>
                            <td><a href="@AnalysisUrl(b.SampledAt)" title="Analysér tidsrummet omkring">@Display.Time(b.SampledAt)</a></td>
                            <td>@b.HeadSessionId <span class="muted">@head?.Status @head?.ProgramName</span></td>
                            <td class="num">@b.BlockedCount</td>
                            <td class="num">@Display.Number(b.MaxWaitMs / 1000.0) s</td>
                        </tr>
                    }
                </tbody>
            </table>
        }
    </section>
    <section class="card">
        <div class="card-head"><h2>Deadlocks, seneste 7 dage</h2></div>
        @if (_deadlocks.Count == 0)
        {
            <p class="muted">Ingen deadlocks registreret.</p>
        }
        else
        {
            <table>
                <thead><tr><th>Tidspunkt</th><th>Offer</th><th>Graf</th></tr></thead>
                <tbody>
                    @foreach (var d in _deadlocks.Take(20))
                    {
                        var victim = d.Processes.FirstOrDefault(p => p.IsVictim);
                        <tr>
                            <td><a href="@AnalysisUrl(d.OccurredAt)" title="Analysér tidsrummet omkring">@Display.Time(d.OccurredAt)</a></td>
                            <td>session @victim?.SessionId <span class="muted">@victim?.ClientApp</span></td>
                            <td><a href="/deadlocks/@(d.DeadlockId).xdl">.xdl</a></td>
                        </tr>
                    }
                </tbody>
            </table>
        }
    </section>
</div>

<section class="card section">
<div class="card-head"><h2>Ikke målbart på denne instans</h2></div>
@if (_notMeasurable.Count == 0)
{
    <p class="muted">Alle regler, der er relevante for instansen, kunne evalueres.</p>
}
else
{
    <p class="muted">Disse regler kunne ikke vurderes. Det er ikke det samme som "OK".</p>
    <table>
        <thead><tr><th>Regel</th><th></th><th>Årsag</th></tr></thead>
        <tbody>
            @foreach (var r in _notMeasurable)
            {
                <tr><td class="mono">@r.RuleId</td><td>@r.RuleTitle</td><td>@r.Reason</td></tr>
            }
        </tbody>
    </table>
}
@if (_notApplicable.Count > 0)
{
    <details class="not-applicable">
        <summary>Ikke relevant for @Display.Release(_instance.ProductVersion, _instance.EngineEdition) (@_notApplicable.Count)</summary>
        <p class="muted">Regler om noget, denne SQL Server-version ikke har (fx Query Store eller system_health). Det er ikke et hul i overvågningen.</p>
        <table>
            <thead><tr><th>Regel</th><th></th><th>Hvorfor</th></tr></thead>
            <tbody>
                @foreach (var r in _notApplicable)
                {
                    <tr><td class="mono">@r.RuleId</td><td>@r.RuleTitle</td><td>@r.Reason</td></tr>
                }
            </tbody>
        </table>
    </details>
}
</section>

<section class="card">
<div class="card-head"><h2>Løst de seneste 30 dage</h2></div>
@if (_resolved.Count == 0)
{
    <p class="muted">Ingen.</p>
}
else
{
    <table>
        <thead><tr><th>Fund</th><th>Aktivt fra</th><th>Løst</th></tr></thead>
        <tbody>
            @foreach (var f in _resolved)
            {
                <tr><td><a href="/fund/@f.FindingId">@f.Title</a></td><td>@Display.Time(f.FirstSeenAt)</td><td>@Display.Time(f.ResolvedAt)</td></tr>
            }
        </tbody>
    </table>
}
</section>

@code {
    [Parameter] public string Name { get; set; } = string.Empty;

    private InstanceOverview? _instance;
    private IReadOnlyList<StoredFinding> _findings = [];
    private IReadOnlyList<StoredFinding> _resolved = [];
    private IReadOnlyList<StoredRuleState> _notMeasurable = [];
    private IReadOnlyList<StoredRuleState> _notApplicable = [];
    private IReadOnlyList<MetricPoint> _cpuSql = [], _cpuOther = [], _batches = [], _ple = [];
    private IReadOnlyList<WaitTotal> _waits = [];
    private IReadOnlyList<FileLatency> _files = [];
    private IReadOnlyList<SQLInsight.Reports.DiskComparison> _disks = [];
    private IReadOnlyList<DiskSeries> _diskSeries = [];
    private IReadOnlyList<StoredBlocking> _blocking = [];
    private IReadOnlyList<StoredDeadlock> _deadlocks = [];

    protected override async Task OnInitializedAsync()
    {
        _instance = await Repository.GetInstanceAsync(Name);
        if (_instance is null)
        {
            return;
        }

        var id = _instance.InstanceId;
        var day = DateTimeOffset.UtcNow.AddDays(-1);
        _findings = await Repository.GetActiveFindingsAsync(id);
        _resolved = await Repository.GetRecentlyResolvedAsync(id, 30);
        var states = await Repository.GetRuleStatesAsync(id);
        _notMeasurable = states.Where(r => r.Outcome is RuleOutcome.NotMeasurable or RuleOutcome.Error).ToList();
        _notApplicable = states.Where(r => r.Outcome == RuleOutcome.NotApplicable).ToList();
        _cpuSql = await Repository.GetMetricAsync(id, Metrics.CpuSqlServer, day);
        _cpuOther = await Repository.GetMetricAsync(id, Metrics.CpuOther, day);
        _batches = await Repository.GetMetricAsync(id, Metrics.BatchRequestsPerSecond, day);
        _ple = await Repository.GetMetricAsync(id, Metrics.PageLifeExpectancy, day);
        _waits = await Repository.GetTopWaitsAsync(id, day, 12);
        _files = await Repository.GetFileLatencyAsync(id, day);
        _disks = (await Repository.GetDiskActivityAsync(id, day, DateTimeOffset.UtcNow)).Select(d => new SQLInsight.Reports.DiskComparison(d, null)).ToList();
        _diskSeries = await Repository.GetDiskSeriesAsync(id, day);
        _blocking = await Repository.GetBlockingAsync(id, day);
        _deadlocks = await Repository.GetDeadlocksAsync(id, DateTimeOffset.UtcNow.AddDays(-7));
    }

    private static string Ms(double? value) => value is { } v ? $"{Display.Number(v, 1)} ms" : "–";

    /// <summary>The time window analysis: the last hour, or half an hour on each side of an event.</summary>
    private string AnalysisUrl(DateTime? around)
    {
        var url = "/instanser/" + Uri.EscapeDataString(_instance!.Name) + "/analyse";
        if (around is not { } at)
        {
            return url;
        }

        var (from, to) = SQLInsight.Reports.TimeWindow.Around(at);
        return url + "?fra=" + Uri.EscapeDataString(SQLInsight.Reports.TimeWindow.ToInput(from, Display.Zone))
               + "&til=" + Uri.EscapeDataString(SQLInsight.Reports.TimeWindow.ToInput(to, Display.Zone));
    }

    private static string LatencyClass(double? value, double threshold) => value >= threshold ? "bad" : string.Empty;
}