@using Sandbox
@using Sandbox.UI
@using System.Linq
@inherits PanelComponent

<root>
    <div class="board">
        <div class="title">@CurrentPageTitle</div>
        <div class="page">
            @switch (CurrentPage)
            {
                case PageType.Controls:
                    <div class="controls-list">
                        <div class="control-row">
                            <div class="label">Move</div>
                            <div class="glyphs">
                                <Image class="glyph" [email protected]("Forward", InputGlyphSize.Large, GlyphStyle.Light) />
                                <Image class="glyph" [email protected]("Left", InputGlyphSize.Large, GlyphStyle.Light) />
                                <Image class="glyph" [email protected]("Backward", InputGlyphSize.Large, GlyphStyle.Light) />
                                <Image class="glyph" [email protected]("Right", InputGlyphSize.Large, GlyphStyle.Light) />
                            </div>
                        </div>
                        <div class="control-row">
                            <div class="label">Jump</div>
                            <div class="glyphs">
                                <Image class="glyph" [email protected]("Jump", InputGlyphSize.Large, GlyphStyle.Light) />
                            </div>
                        </div>
                        <div class="control-row">
                            <div class="label">Leap Dive</div>
                            <div class="glyphs">
                                <Image class="glyph" [email protected]("Attack1", InputGlyphSize.Large, GlyphStyle.Light) />
                            </div>
                        </div>
                    </div>
                    break;
                case PageType.Title:
                    <div class="title-page">
                        <img class="title-thumbnail" src="textures/dropout_thumbnail_910x512.png" />
                    </div>
                    break;
            }
        </div>
    </div>
</root>

@code {
    // To add a new page: add an enum value, add it to Pages, and add a switch case above.
    private enum PageType
    {
        Controls,
        Title,
    }

    private static readonly PageType[] Pages = new[]
    {
        PageType.Controls,
        PageType.Title,
    };

    /// <summary>Seconds each page is shown before cycling to the next.</summary>
    private const float PageDuration = 8f;

    private int _pageIndex = 0;
    private TimeUntil _nextPageAt = PageDuration;

    private PageType CurrentPage => Pages[_pageIndex];

    private string CurrentPageTitle => CurrentPage switch
    {
        PageType.Controls => "Controls",
        PageType.Title => "",
        _ => string.Empty,
    };

    protected override void OnUpdate()
    {
        if (Pages.Length <= 1) return;

        if ((float)_nextPageAt <= 0f)
        {
            _pageIndex = (_pageIndex + 1) % Pages.Length;
            _nextPageAt = PageDuration;
        }
    }

    protected override int BuildHash() => System.HashCode.Combine(_pageIndex, Input.UsingController);
}