@using System.Text.Json
@using ZB.MOM.WW.OtOpcUa.Admin.Components.Pages.Modbus
@using ZB.MOM.WW.OtOpcUa.Admin.Services
@using ZB.MOM.WW.OtOpcUa.Configuration.Entities
@inject DriverInstanceService DriverSvc
@inject NamespaceService NsSvc

<div class="d-flex justify-content-between mb-3">
    <h4 class="panel-head">DriverInstances</h4>
    <button class="btn btn-sm btn-primary" @onclick="() => _showForm = true">Add driver</button>
</div>

@if (_drivers is null) { <p>Loading…</p> }
else if (_drivers.Count == 0) { <p class="text-muted">No drivers configured in this draft.</p> }
else
{
    <section class="panel rise" style="animation-delay:.02s">
        <div class="panel-head">Configured drivers</div>
        <div class="table-wrap">
            <table class="data-table">
                <thead><tr><th>DriverInstanceId</th><th>Name</th><th>Type</th><th>Namespace</th></tr></thead>
                <tbody>
                @foreach (var d in _drivers)
                {
                    <tr>
                        <td><span class="mono">@d.DriverInstanceId</span></td>
                        <td>@d.Name</td>
                        <td>
                            @if (string.Equals(d.DriverType, "Focas", StringComparison.OrdinalIgnoreCase))
                            {
                                <a href="/drivers/focas/@d.DriverInstanceId">@d.DriverType</a>
                            }
                            else
                            {
                                @d.DriverType
                            }
                        </td>
                        <td><span class="mono">@d.NamespaceId</span></td>
                    </tr>
                }
                </tbody>
            </table>
        </div>
    </section>
}

@if (_showForm && _namespaces is not null)
{
    <section class="panel rise" style="animation-delay:.08s">
        <div class="panel-head">Add driver</div>
        <div class="card-body">
            <div class="row g-3">
                <div class="col-md-3">
                    <label class="form-label">Name</label>
                    <input class="form-control form-control-sm" @bind="_name"/>
                </div>
                <div class="col-md-3">
                    <label class="form-label">DriverType</label>
                    <select class="form-select form-select-sm" @bind="_type">
                        <option>Galaxy</option>
                        <option>Modbus</option>
                        <option>AbCip</option>
                        <option>AbLegacy</option>
                        <option>S7</option>
                        <option>Focas</option>
                        <option>OpcUaClient</option>
                    </select>
                    <div class="form-text">Type string must match the driver's registered factory name; this dropdown wraps the canonical names.</div>
                </div>
                <div class="col-md-6">
                    <label class="form-label">Namespace</label>
                    <select class="form-select form-select-sm" @bind="_nsId">
                        @foreach (var n in _namespaces) { <option value="@n.NamespaceId">@n.Kind — @n.NamespaceUri</option> }
                    </select>
                </div>
                <div class="col-12">
                    @if (string.Equals(_type, "Modbus", StringComparison.OrdinalIgnoreCase))
                    {
                        @* #147 — typed editor for Modbus drivers. The generic textarea is a fall-back
                           for driver types that haven't yet shipped a typed editor. *@
                        <label class="form-label">Modbus options (typed editor)</label>
                        <ModbusOptionsEditor Model="_modbusOptions"/>
                    }
                    else
                    {
                        <label class="form-label">DriverConfig JSON (schemaless per driver type)</label>
                        <textarea class="form-control form-control-sm font-monospace" rows="6" @bind="_config"></textarea>
                        <div class="form-text">Phase 1: generic JSON editor — per-driver schema validation arrives in each driver's phase (decision #94).</div>
                    }
                </div>
            </div>
            @if (_error is not null) { <section class="panel notice mt-3">@_error</section> }
            <div class="mt-3">
                <button class="btn btn-sm btn-primary" @onclick="SaveAsync">Save</button>
                <button class="btn btn-sm btn-secondary ms-2" @onclick="() => _showForm = false">Cancel</button>
            </div>
        </div>
    </section>
}

@code {
    [Parameter] public long GenerationId { get; set; }
    [Parameter] public string ClusterId { get; set; } = string.Empty;

    private List<DriverInstance>? _drivers;
    private List<Namespace>? _namespaces;
    private bool _showForm;
    private string _name = string.Empty;
    private string _type = "Modbus";
    private string _nsId = string.Empty;
    private string _config = "{}";
    private string? _error;

    // #147 — typed editor model for Modbus drivers. Defaults match ModbusDriverOptions
    // defaults so an unedited form produces config equivalent to the historical
    // pre-typed-editor wire output. Serialised to _config on Save when type=Modbus.
    private ModbusOptionsEditor.ModbusOptionsViewModel _modbusOptions = new();
    private static readonly JsonSerializerOptions ModbusJsonOptions = new() { WriteIndented = true };

    protected override async Task OnParametersSetAsync() => await ReloadAsync();

    private async Task ReloadAsync()
    {
        _drivers = await DriverSvc.ListAsync(GenerationId, CancellationToken.None);
        _namespaces = await NsSvc.ListAsync(GenerationId, CancellationToken.None);
        _nsId = _namespaces.FirstOrDefault()?.NamespaceId ?? string.Empty;
    }

    private async Task SaveAsync()
    {
        _error = null;
        if (string.IsNullOrWhiteSpace(_name) || string.IsNullOrWhiteSpace(_nsId))
        {
            _error = "Name and Namespace are required";
            return;
        }
        try
        {
            // #147 — for Modbus drivers serialize the typed editor model into the DriverConfig
            // JSON column. Other driver types still use the raw textarea contents until each
            // ships its own typed editor (decision #94 — per-driver schema validation arrives
            // per driver phase).
            var configJson = string.Equals(_type, "Modbus", StringComparison.OrdinalIgnoreCase)
                ? SerializeModbusOptions(_modbusOptions)
                : _config;

            await DriverSvc.AddAsync(GenerationId, ClusterId, _nsId, _name, _type, configJson, CancellationToken.None);
            _name = string.Empty; _config = "{}";
            _modbusOptions = new();
            _showForm = false;
            await ReloadAsync();
        }
        catch (Exception ex) { _error = ex.Message; }
    }

    /// <summary>
    ///     Maps the view-model field names onto the JSON shape <c>ModbusDriverFactoryExtensions</c>
    ///     consumes. Hand-rolled because the DTO uses millisecond / byte field flavours that the
    ///     view model exposes as TimeSpan-derived integers; a System.Text.Json round-trip would
    ///     emit the .NET-native names instead.
    /// </summary>
    private static string SerializeModbusOptions(ModbusOptionsEditor.ModbusOptionsViewModel m) =>
        JsonSerializer.Serialize(new
        {
            host = m.Host,
            port = m.Port,
            unitId = m.UnitId,
            family = m.Family.ToString(),
            melsecSubFamily = m.MelsecSubFamily.ToString(),
            keepAlive = new
            {
                enabled = m.KeepAliveEnabled,
                timeMs = m.KeepAliveTimeSec * 1000,
                intervalMs = m.KeepAliveIntervalSec * 1000,
                retryCount = m.KeepAliveRetryCount,
            },
            reconnect = new
            {
                initialDelayMs = m.ReconnectInitialDelayMs,
                maxDelayMs = m.ReconnectMaxDelayMs,
                backoffMultiplier = m.ReconnectBackoffMultiplier,
            },
            maxRegistersPerRead = m.MaxRegistersPerRead,
            maxRegistersPerWrite = m.MaxRegistersPerWrite,
            maxCoilsPerRead = m.MaxCoilsPerRead,
            maxReadGap = m.MaxReadGap,
            useFC15ForSingleCoilWrites = m.UseFC15ForSingleCoilWrites,
            useFC16ForSingleRegisterWrites = m.UseFC16ForSingleRegisterWrites,
            writeOnChangeOnly = m.WriteOnChangeOnly,
            tags = Array.Empty<object>(),
        }, ModbusJsonOptions);
}