voice-cat/clients/apple/VoiceCat.Mac/ChannelEditor.cs

using AppKit;
using CoreGraphics;
using Voicecat.V1;
using Channel = Voicecat.V1.Channel;

namespace VoiceCat.Mac;

internal static class ChannelEditor
{
    internal static ChannelEdit? Run(Channel? existing, IReadOnlyList<Channel> channels, bool supportsAdaptivePacketLoss)
    {
        var view = new NSView(new CGRect(0, 0, 520, 500));
        var name = Field(existing?.Name ?? "", 360); var topic = Field(existing?.Topic ?? "", 330);
        var parent = Picker(channels.Select(channel => channel.Name).Prepend("No parent").ToArray(), 300);
        int parentIndex = existing is null ? 0 : channels.ToList().FindIndex(channel => channel.Id == existing.ParentId) + 1; parent.SelectItem(Math.Max(0, parentIndex));
        var type = Picker(["Permanent", "Temporary"], 270); type.SelectItem(existing?.Type == ChannelType.ChannelTemporary ? 1 : 0);
        var maximum = Field((existing?.MaxUsers ?? 0).ToString(), 240); var order = Field((existing?.Order ?? 0).ToString(), 210);
        var password = new NSSecureTextField(new CGRect(155, 180, 345, 24)) { PlaceholderString = existing?.PasswordProtected == true ? "Leave blank to preserve" : "Optional" };
        var mode = Picker(["Mono", "Stereo"], 150); mode.SelectItem(existing?.Audio?.Mode == ChannelMode.ModeStereo ? 1 : 0);
        var rate = Picker(["8000", "12000", "16000", "24000", "48000"], 120); Select(rate, (existing?.Audio?.SampleRate ?? 48000).ToString());
        var frame = Picker(["5", "10", "20", "40", "60"], 90); Select(frame, (existing?.Audio?.FrameMs ?? 20).ToString());
        var application = Picker(["VoIP", "Audio", "Low delay"], 60); application.SelectItem((int)(existing?.Audio?.Application ?? OpusApplication.OpusVoip));
        var bitrate = Field((existing?.Audio?.BitrateBps ?? 64000).ToString(), 30);
        Add(view, "Name", name, 360); Add(view, "Topic", topic, 330); Add(view, "Parent", parent, 300); Add(view, "Type", type, 270);
        Add(view, "Maximum users (0=none)", maximum, 240); Add(view, "Sort order", order, 210); Add(view, "Password", password, 180);
        Add(view, "Mode", mode, 150); Add(view, "Sample rate", rate, 120); Add(view, "Frame ms", frame, 90); Add(view, "Application", application, 60); Add(view, "Bitrate", bitrate, 30);

        var advanced = new NSView(new CGRect(0, 0, 520, 175));
        var automaticLoss = Check("Automatic packet loss", existing?.Audio?.PacketLossMode != PacketLossMode.PacketLossManual, 155, 140);
        automaticLoss.Frame = new CGRect(155, 140, 200, 24);
        automaticLoss.Enabled = supportsAdaptivePacketLoss;
        var lossSpeed = Picker(["Fast", "Balanced", "Stable"], 105);
        lossSpeed.SelectItem(existing?.Audio?.PacketLossMode switch { PacketLossMode.PacketLossAutoFast => 0, PacketLossMode.PacketLossAutoStable => 2, _ => 1 });
        var loss = Field((existing?.Audio?.ExpectedPacketLoss ?? 5).ToString(), 70); loss.Frame = new CGRect(155, 70, 100, 24);
        var complexity = Field((existing?.Audio?.Complexity ?? 10).ToString(), 40); complexity.Frame = new CGRect(155, 40, 100, 24);
        var fec = Check("In-band FEC", existing?.Audio?.Fec ?? true, 0, 10); var dtx = Check("DTX", existing?.Audio?.Dtx ?? true, 130, 10);
        var dred = Check("Deep redundancy", existing?.Audio?.Dred ?? false, 230, 10);
        void UpdateLossControls() { loss.Enabled = !On(automaticLoss); lossSpeed.Enabled = supportsAdaptivePacketLoss && On(automaticLoss); }
        automaticLoss.Activated += (_, _) => UpdateLossControls(); UpdateLossControls();
        advanced.AddSubview(automaticLoss); Add(advanced, "Adaptation speed", lossSpeed, 105); Add(advanced, "Packet loss %", loss, 70); Add(advanced, "Complexity 0–10", complexity, 40);
        advanced.AddSubview(fec); advanced.AddSubview(dtx); advanced.AddSubview(dred);
        var container = new NSView(new CGRect(0, 0, 520, 690)); view.Frame = new CGRect(0, 180, 520, 500); container.AddSubview(view); container.AddSubview(advanced);
        var alert = new NSAlert { MessageText = existing is null ? "Create channel" : "Edit channel", AccessoryView = container };
        alert.AddButton(existing is null ? "Create" : "Save"); alert.AddButton("Cancel"); if (alert.RunModal() != 1000) return null;
        if (string.IsNullOrWhiteSpace(name.StringValue) || !uint.TryParse(maximum.StringValue, out uint max) || !int.TryParse(order.StringValue, out int sort) ||
            !uint.TryParse(rate.TitleOfSelectedItem, out uint sampleRate) || !uint.TryParse(frame.TitleOfSelectedItem, out uint frameMs) ||
            !uint.TryParse(bitrate.StringValue, out uint bitrateValue) || !uint.TryParse(loss.StringValue, out uint packetLoss) ||
            !uint.TryParse(complexity.StringValue, out uint complexityValue) || packetLoss > 100 || complexityValue > 10) return null;
        uint parentId = parent.IndexOfSelectedItem <= 0 ? 0 : channels[checked((int)parent.IndexOfSelectedItem - 1)].Id;
        return new(new Channel
        {
            Id = existing?.Id ?? 0, ParentId = parentId, Name = name.StringValue.Trim(), Topic = topic.StringValue.Trim(), MaxUsers = max, Order = sort,
            Type = type.IndexOfSelectedItem == 1 ? ChannelType.ChannelTemporary : ChannelType.ChannelPermanent,
            Audio = new AudioConfig { Codec = 0, Mode = mode.IndexOfSelectedItem == 1 ? ChannelMode.ModeStereo : ChannelMode.ModeMono,
                SampleRate = sampleRate, FrameMs = frameMs, Application = (OpusApplication)(int)application.IndexOfSelectedItem, BitrateBps = bitrateValue,
                Fec = On(fec), Dtx = On(dtx), Dred = On(dred), ExpectedPacketLoss = packetLoss, Complexity = complexityValue,
                PacketLossMode = On(automaticLoss) ? lossSpeed.IndexOfSelectedItem switch
                { 0 => PacketLossMode.PacketLossAutoFast, 2 => PacketLossMode.PacketLossAutoStable, _ => PacketLossMode.PacketLossAutoBalanced } : PacketLossMode.PacketLossManual }
        }, password.StringValue);
    }

    private static NSTextField Field(string value, double y) => new(new CGRect(155, y, 345, 24)) { StringValue = value };
    private static NSPopUpButton Picker(string[] values, double y) { var picker = new NSPopUpButton(new CGRect(155, y, 345, 26), false); picker.AddItems(values); return picker; }
    private static NSButton Check(string title, bool value, double x, double y) { NSButton check = NSButton.CreateCheckbox(title, () => { }); check.Frame = new CGRect(x, y, 125, 24); check.State = value ? NSCellStateValue.On : NSCellStateValue.Off; return check; }
    private static bool On(NSButton value) => value.State == NSCellStateValue.On;
    private static void Add(NSView view, string label, NSView control, double y) { var text = NSTextField.CreateLabel(label); text.Frame = new CGRect(0, y + 2, 145, 20); view.AddSubview(text); view.AddSubview(control); ((INSAccessibility)control).AccessibilityLabel = label; }
    private static void Select(NSPopUpButton picker, string value) { for (nint i = 0; i < picker.ItemCount; i++) if (picker.ItemTitle(i) == value) { picker.SelectItem(i); return; } }
}