using System.Windows;
using System.Windows.Controls;
using ytLive.Models;

namespace ytLive.Controls;

/// <summary>The sound bars (creator ruling 2026-10-30). This unit owns the SHELL: the piece of the
/// window it occupies and the collapse behaviour. The bays and the master readouts fill in over
/// the following units, so nothing here pretends to be a working meter.
///
/// <para>Collapse is driven by the window height, not a user setting: at 1366×768 a full dock
/// squeezes the preview, and the creator should not have to manage that.</para></summary>
public partial class AudioDock : UserControl
{
    private Window? _window;

    public AudioDock()
    {
        InitializeComponent();
        Loaded += OnLoaded;
        Unloaded += OnUnloaded;
    }

    /// <summary>Is the dock showing only the telemetry strip?</summary>
    internal bool IsCollapsed { get; private set; }

    /// <summary>Test seam: the same code the window's SizeChanged runs, without a window.</summary>
    internal void ApplyWindowHeight(double windowHeight)
    {
        var collapsed = AudioDockLayout.IsCollapsed(windowHeight);
        IsCollapsed = collapsed;
        Height = AudioDockLayout.HeightFor(windowHeight);
        Bays.Visibility = collapsed ? Visibility.Collapsed : Visibility.Visible;
    }

    private void OnLoaded(object sender, RoutedEventArgs e)
    {
        _window = Window.GetWindow(this);
        if (_window == null)
        {
            ApplyWindowHeight(AudioDockLayout.CollapseBelowHeight);   // no host: show the dock
            return;
        }
        _window.SizeChanged += OnWindowSizeChanged;
        ApplyWindowHeight(_window.ActualHeight > 0 ? _window.ActualHeight : _window.Height);
    }

    private void OnUnloaded(object sender, RoutedEventArgs e)
    {
        if (_window != null) _window.SizeChanged -= OnWindowSizeChanged;
        _window = null;
    }

    private void OnWindowSizeChanged(object sender, SizeChangedEventArgs e) => ApplyWindowHeight(e.NewSize.Height);
}