@namespace DnsmasqWebUI.Components.EffectiveConfig.CustomDisplays
@using DnsmasqWebUI.Models.Dnsmasq
@using DnsmasqWebUI.Models.Dnsmasq.EffectiveConfig
@inherits EffectiveConfigValueDisplayBase

@* do-0x20-encode / no-0x20-encode: tri-state. Switch shows Enabled vs not-Enabled; uncheck maps back to Default when that was the value at activation, else Disabled. *@
@if (IsActiveEditor && Descriptor.GetSource()?.IsReadOnly != true)
{
    var isOn = GetState() == ExplicitToggleState.Enabled;
    <div class="form-check form-switch ec-effective-switch">
        <input type="checkbox"
               class="form-check-input"
               checked="@isOn"
               aria-label="Enable @Descriptor.OptionName"
               title="Set @Descriptor.OptionName"
               @onchange="OnCheckedChange"
               @onfocusout="OnCommitRequested" />
    </div>
}
else
{
    @* Intentionally show both Default and Disabled as "Disabled" (product choice: collapse unset and off). Do not "fix" to show "Default" for unset. *@
    @(GetState() == ExplicitToggleState.Enabled ? "Enabled" : "Disabled")
}

@code {
    private ExplicitToggleState _stateAtActivation;
    private bool _wasActiveEditor;

    private ExplicitToggleState GetState()
    {
        var v = GetEffectiveDisplayValue();
        if (v is ExplicitToggleState s) return s;
        return ExplicitToggleState.Default;
    }

    protected override void OnParametersSet()
    {
        if (!IsActiveEditor)
            _stateAtActivation = GetState();
        else if (!_wasActiveEditor)
            _stateAtActivation = GetState();
        _wasActiveEditor = IsActiveEditor;
    }

    private async Task OnCheckedChange(ChangeEventArgs e)
    {
        var isChecked = e.Value is true;
        if (isChecked)
        {
            await NotifyValueChanged(ExplicitToggleState.Enabled);
            return;
        }

        var pending = Session?.Draft.PendingChanges.OfType<PendingOptionChange>().FirstOrDefault(c =>
            string.Equals(c.SectionId, Descriptor.SectionId, StringComparison.OrdinalIgnoreCase) &&
            string.Equals(c.OptionName, Descriptor.OptionName, StringComparison.OrdinalIgnoreCase));
        if (pending?.OldValue is ExplicitToggleState previousState)
        {
            await NotifyValueChanged(previousState);
            return;
        }

        // No existing pending edit for this field: map unchecked based on the state at activation.
        // Default and Disabled both display as "Disabled" in view mode, so we preserve true intent here.
        await NotifyValueChanged(_stateAtActivation == ExplicitToggleState.Default ? ExplicitToggleState.Default : ExplicitToggleState.Disabled);
    }
}