using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Windows.Data;
using ytLive.Services;

namespace ytLive.Models;

/// <summary>
/// The app's five canonical scenes. Scenes are worked on by name; you can delete
/// them ("work with less"), but the app only ever adds back one of these five —
/// anything beyond them is OBS territory. The live desktop/game background exists
/// only in the Live scene.
/// </summary>
public static class SceneCatalog
{
    public const string Starting = "Starting";
    public const string Live = "Live";
    public const string Brb = "BRB";
    public const string Chat = "Chat";
    public const string Ending = "Ending";

    public static readonly string[] All = { Starting, Live, Brb, Chat, Ending };

    /// <summary>Maps each canonical scene name to its hotkey action.</summary>
    public static readonly IReadOnlyDictionary<string, HotkeyId> SceneHotkeys = new Dictionary<string, HotkeyId>(StringComparer.OrdinalIgnoreCase)
    {
        [Starting] = HotkeyId.SceneStarting,
        [Live]     = HotkeyId.SceneLive,
        [Brb]      = HotkeyId.SceneBrb,
        [Chat]     = HotkeyId.SceneChat,
        [Ending]   = HotkeyId.SceneEnding,
    };

    private static readonly Dictionary<string, string> DisplayNames = new(StringComparer.OrdinalIgnoreCase)
    {
    };

    public static string DisplayName(string? name)
        => name != null && DisplayNames.TryGetValue(name.Trim(), out var display) ? display : name ?? string.Empty;

    public static readonly IValueConverter DisplayNameConverter = new SceneDisplayNameConverter();

    private sealed class SceneDisplayNameConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
            => DisplayName(value as string);

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
            => value ?? string.Empty;
    }

    public static bool IsCanonical(string? name)
        => name != null && All.Contains(name.Trim(), StringComparer.OrdinalIgnoreCase);

    public static bool Is(string? name, string canonical)
        => name != null && string.Equals(name.Trim(), canonical, StringComparison.OrdinalIgnoreCase);

    public static bool IsChat(string? name) => Is(name, Chat);

    /// <summary>Every scene has a background layer.</summary>
    public static bool HasBackground(string? name) => IsCanonical(name);
}