@page "/modbus/diagnostics/{DriverInstanceId}"
@using Microsoft.AspNetCore.Components.Web
@using ZB.MOM.WW.OtOpcUa.Admin.Services
@rendermode RenderMode.InteractiveServer
@inject DriverDiagnosticsClient Diagnostics

@*
    #154 — operator-facing view of the Server's auto-prohibition state for a Modbus driver.
    Fetches via DriverDiagnosticsClient (HttpClient against the Server's HealthEndpointsHost).
    Refreshes on demand; auto-refresh is a future task once a SignalR diag channel exists.
*@

<PageTitle>Modbus diagnostics — @DriverInstanceId</PageTitle>

<h1 class="page-title">Modbus auto-prohibitions</h1>
<p class="text-muted">
    Driver instance <span class="mono">@DriverInstanceId</span>. Live snapshot of coalesced ranges
    the planner has learned to read individually (#148 / #150 / #151 / #152).
</p>

<div class="toolbar" style="margin-bottom:.75rem">
    <button class="btn btn-sm btn-outline-primary" @onclick="LoadAsync" disabled="@_loading">
        @(_loading ? "Loading…" : "Refresh")
    </button>
    @if (_lastRefreshed is not null)
    {
        <span class="text-muted ms-3 small">Last refreshed @_lastRefreshed.Value.ToLocalTime().ToString("HH:mm:ss")</span>
    }
    <span class="spacer"></span>
</div>

@if (_error is not null)
{
    <section class="panel notice rise" style="animation-delay:.02s">@_error</section>
}
else if (_response is null)
{
    <p class="text-muted">Click <strong>Refresh</strong> to load.</p>
}
else if (_response.Count == 0)
{
    <section class="panel notice rise" style="animation-delay:.02s">No auto-prohibitions. The planner is coalescing freely.</section>
}
else
{
    <section class="panel rise" style="animation-delay:.02s">
        <div class="panel-head">Prohibited ranges</div>
        <div class="table-wrap">
            <table class="data-table">
                <thead>
                    <tr>
                        <th>Unit</th>
                        <th>Region</th>
                        <th class="num">Start</th>
                        <th class="num">End</th>
                        <th class="num">Span</th>
                        <th>Status</th>
                        <th>Last probed</th>
                    </tr>
                </thead>
                <tbody>
                @foreach (var r in _response.Ranges.OrderBy(r => r.UnitId).ThenBy(r => r.Region).ThenBy(r => r.StartAddress))
                {
                    <tr>
                        <td class="mono">@r.UnitId</td>
                        <td class="mono">@r.Region</td>
                        <td class="num mono">@r.StartAddress</td>
                        <td class="num mono">@r.EndAddress</td>
                        <td class="num">@(r.EndAddress - r.StartAddress + 1)</td>
                        <td>
                            @if (r.BisectionPending)
                            {
                                <span class="chip chip-warn">BISECTING</span>
                            }
                            else
                            {
                                <span class="chip chip-bad">ISOLATED</span>
                            }
                        </td>
                        <td class="small text-muted">@FormatTimeSince(r.LastProbedUtc)</td>
                    </tr>
                }
                </tbody>
            </table>
        </div>
    </section>
}

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

    private ModbusAutoProhibitionsResponse? _response;
    private string? _error;
    private bool _loading;
    private DateTime? _lastRefreshed;

    private async Task LoadAsync()
    {
        _loading = true;
        _error = null;
        try
        {
            _response = await Diagnostics.GetModbusAutoProhibitedRangesAsync(DriverInstanceId);
            _lastRefreshed = DateTime.UtcNow;
            if (_response is null)
                _error = $"Server reports driver '{DriverInstanceId}' is not present or is not a Modbus driver.";
        }
        catch (Exception ex)
        {
            _error = $"Fetch failed: {ex.Message}";
        }
        finally
        {
            _loading = false;
        }
    }

    private static string FormatTimeSince(DateTime utc)
    {
        var span = DateTime.UtcNow - utc;
        if (span.TotalSeconds < 60) return $"{(int)span.TotalSeconds}s ago";
        if (span.TotalMinutes < 60) return $"{(int)span.TotalMinutes}m ago";
        if (span.TotalHours < 24) return $"{(int)span.TotalHours}h ago";
        return $"{(int)span.TotalDays}d ago";
    }
}