using AcDream.App.UI;

namespace AcDream.App.Tests.UI;

public class UiItemSlotTests
{
    [Fact]
    public void IsLeafWidget()
        => Assert.True(new UiItemSlot().ConsumesDatChildren);

    [Fact]
    public void DefaultEmptySprite_isToolbarBorder()
        => Assert.Equal(0x060074CFu, new UiItemSlot().EmptySprite);

    [Fact]
    public void Empty_whenNoItem()
    {
        var s = new UiItemSlot();
        Assert.Equal(0u, s.ItemId);
        Assert.Equal(0u, s.IconTexture);
    }

    [Fact]
    public void SetItem_setsIdAndTexture()
    {
        var s = new UiItemSlot();
        s.SetItem(0x5001u, 0x99u);
        Assert.Equal(0x5001u, s.ItemId);
        Assert.Equal(0x99u, s.IconTexture);
    }

    [Fact]
    public void Clear_afterSetItem_resetsToEmpty()
    {
        var s = new UiItemSlot();
        s.SetItem(0x5001u, 0x99u);
        s.Clear();
        Assert.Equal(0u, s.ItemId);
        Assert.Equal(0u, s.IconTexture);
    }

    // ── Shortcut number tests ────────────────────────────────────────────────
    // Port of UIElement_UIItem::SetShortcutNum (acclient_2013_pseudo_c.txt:229465).

    [Fact]
    public void ShortcutNum_defaultIsMinusOne()
    {
        var s = new UiItemSlot();
        Assert.Equal(-1, s.ShortcutNum);
    }

    [Fact]
    public void ShortcutPeace_defaultIsTrue()
    {
        var s = new UiItemSlot();
        Assert.True(s.ShortcutPeace);
    }

    [Fact]
    public void SetShortcutNum_setsIndexAndPeace()
    {
        var s = new UiItemSlot();
        s.SetShortcutNum(3, peace: false);
        Assert.Equal(3, s.ShortcutNum);
        Assert.False(s.ShortcutPeace);
    }

    [Fact]
    public void SetShortcutNum_peaceTrue()
    {
        var s = new UiItemSlot();
        s.SetShortcutNum(0, peace: true);
        Assert.Equal(0, s.ShortcutNum);
        Assert.True(s.ShortcutPeace);
    }

    [Fact]
    public void ClearShortcutNum_setsMinusOne()
    {
        var s = new UiItemSlot();
        s.SetShortcutNum(5, peace: true);
        s.ClearShortcutNum();
        Assert.Equal(-1, s.ShortcutNum);
    }

    // ── ActiveDigitArray occupancy gating (decomp UIElement_UIItem::SetShortcutNum:229481) ──

    private static readonly uint[] Peace = { 0x10u, 0x11u, 0x12u };
    private static readonly uint[] War   = { 0x20u, 0x21u, 0x22u };
    private static readonly uint[] Empty = { 0x30u, 0x31u, 0x32u };

    /// <summary>
    /// When ItemId == 0 (empty slot), ActiveDigitArray returns EmptyDigits regardless
    /// of ShortcutPeace. Retail ref: UIElement_UIItem::SetShortcutNum (decomp 229481) —
    /// else branch when m_elem_Icon->m_state == 0x1000001c (empty).
    /// </summary>
    [Fact]
    public void ActiveDigitArray_emptySlot_returnsEmptyDigits()
    {
        var s = new UiItemSlot { PeaceDigits = Peace, WarDigits = War, EmptyDigits = Empty };
        s.SetShortcutNum(0, peace: true);
        // ItemId == 0 → EmptyDigits
        Assert.Same(Empty, s.ActiveDigitArray());
    }

    [Fact]
    public void ActiveDigitArray_emptySlot_warStance_stillReturnsEmptyDigits()
    {
        var s = new UiItemSlot { PeaceDigits = Peace, WarDigits = War, EmptyDigits = Empty };
        s.SetShortcutNum(0, peace: false);
        // ItemId == 0 → EmptyDigits regardless of stance
        Assert.Same(Empty, s.ActiveDigitArray());
    }

    /// <summary>
    /// When ItemId != 0 (occupied), ActiveDigitArray returns PeaceDigits or WarDigits
    /// depending on ShortcutPeace. Retail ref: UIElement_UIItem::SetShortcutNum (decomp 229481/229493).
    /// </summary>
    [Fact]
    public void ActiveDigitArray_occupiedSlot_peaceStance_returnsPeaceDigits()
    {
        var s = new UiItemSlot { PeaceDigits = Peace, WarDigits = War, EmptyDigits = Empty };
        s.SetItem(0x5001u, 0x99u);
        s.SetShortcutNum(0, peace: true);
        Assert.Same(Peace, s.ActiveDigitArray());
    }

    [Fact]
    public void ActiveDigitArray_occupiedSlot_warStance_returnsWarDigits()
    {
        var s = new UiItemSlot { PeaceDigits = Peace, WarDigits = War, EmptyDigits = Empty };
        s.SetItem(0x5001u, 0x99u);
        s.SetShortcutNum(0, peace: false);
        Assert.Same(War, s.ActiveDigitArray());
    }

    [Fact]
    public void ActiveDigitArray_emptySlot_nullEmptyDigits_returnsNull()
    {
        var s = new UiItemSlot { PeaceDigits = Peace, WarDigits = War, EmptyDigits = null };
        s.SetShortcutNum(0, peace: true);
        Assert.Null(s.ActiveDigitArray());
    }
}