@page "/alarms/historian"
@using Microsoft.AspNetCore.Components.Web
@using ZB.MOM.WW.OtOpcUa.Admin.Services
@using ZB.MOM.WW.OtOpcUa.Core.AlarmHistorian
@rendermode RenderMode.InteractiveServer
@inject HistorianDiagnosticsService Diag

<h1 class="page-title">Alarm historian</h1>
<p class="text-muted">Local store-and-forward queue that ships alarm events to Aveva Historian via Galaxy.Host.</p>

<section class="agg-grid rise" style="animation-delay:.02s">
    <div class="agg-card">
        <div class="agg-label">Drain state</div>
        <div class="agg-value"><span class="chip @BadgeFor(_status.DrainState)">@_status.DrainState</span></div>
    </div>
    <div class="agg-card">
        <div class="agg-label">Queue depth</div>
        <div class="agg-value numeric">@_status.QueueDepth.ToString("N0")</div>
    </div>
    <div class="agg-card">
        <div class="agg-label">Dead-letter depth</div>
        <div class="agg-value numeric">@_status.DeadLetterDepth.ToString("N0")</div>
    </div>
    <div class="agg-card">
        <div class="agg-label">Last success</div>
        <div class="agg-value">@(_status.LastSuccessUtc?.ToString("u") ?? "—")</div>
    </div>
</section>

@if (!string.IsNullOrEmpty(_status.LastError))
{
    <section class="panel notice rise" style="animation-delay:.08s">
        <strong>Last error:</strong> @_status.LastError
    </section>
}

<div class="d-flex gap-2 mt-3">
    <button class="btn btn-outline-secondary" @onclick="RefreshAsync">Refresh</button>
    <button class="btn btn-warning" disabled="@(_status.DeadLetterDepth == 0)" @onclick="RetryDeadLetteredAsync">
        Retry dead-lettered (@_status.DeadLetterDepth)
    </button>
</div>

@if (_retryResult is not null)
{
    <section class="panel notice rise" style="animation-delay:.08s">Requeued @_retryResult row(s) for retry.</section>
}

@code {
    private HistorianSinkStatus _status = new(0, 0, null, null, null, HistorianDrainState.Disabled);
    private int? _retryResult;

    protected override void OnInitialized() => _status = Diag.GetStatus();

    private Task RefreshAsync()
    {
        _status = Diag.GetStatus();
        _retryResult = null;
        return Task.CompletedTask;
    }

    private Task RetryDeadLetteredAsync()
    {
        _retryResult = Diag.TryRetryDeadLettered();
        _status = Diag.GetStatus();
        return Task.CompletedTask;
    }

    private static string BadgeFor(HistorianDrainState s) => s switch
    {
        HistorianDrainState.Idle => "chip-ok",
        HistorianDrainState.Draining => "chip-idle",
        HistorianDrainState.BackingOff => "chip-warn",
        HistorianDrainState.Disabled => "chip-idle",
        _ => "chip-idle",
    };
}