using System.Linq;
using AcDream.App.UI;
using AcDream.UI.Abstractions;

namespace AcDream.App.Tests.UI;

public class UiChannelMenuTests
{
    // PopupH = Rows(7) * ItemH(17) = 119; popup opens upward so top = -119.
    // Item idx -> col = idx/7, row = idx%7; row band y in [top+row*17, top+(row+1)*17).
    // Right column needs lx >= ColW(191).

    [Fact]
    public void Items_HasExpected14Entries()
    {
        Assert.Equal(14, UiChannelMenu.Items.Length);
    }

    [Fact]
    public void Items_FirstEntry_IsSquelch_Special()
    {
        Assert.Equal("Squelch (ignore)", UiChannelMenu.Items[0].Label);
        Assert.Null(UiChannelMenu.Items[0].Channel);
    }

    [Fact]
    public void Items_LastEntry_IsOlthoi()
    {
        var last = UiChannelMenu.Items[^1];
        Assert.Equal("Tell to Olthoi Chat", last.Label);
        Assert.Equal(ChatChannelKind.Olthoi, last.Channel);
    }

    [Fact]
    public void Items_ContainAll12ChannelKinds()
    {
        var kinds = new HashSet<ChatChannelKind>(
            UiChannelMenu.Items.Where(i => i.Channel is not null).Select(i => i.Channel!.Value));
        foreach (var k in new[]
        {
            ChatChannelKind.Say, ChatChannelKind.General, ChatChannelKind.Trade, ChatChannelKind.Lfg,
            ChatChannelKind.Fellowship, ChatChannelKind.Allegiance, ChatChannelKind.Patron,
            ChatChannelKind.Vassals, ChatChannelKind.Monarch, ChatChannelKind.Roleplay,
            ChatChannelKind.Society, ChatChannelKind.Olthoi,
        })
            Assert.Contains(k, kinds);
    }

    [Fact]
    public void DefaultSelected_IsSay()
    {
        Assert.Equal(ChatChannelKind.Say, new UiChannelMenu().Selected);
    }

    [Fact]
    public void Select_AvailableLeftColumnItem_FiresChannel()
    {
        var menu = new UiChannelMenu { Width = 80f, Height = 18f };
        Assert.True(menu.OnEvent(new UiEvent(0, menu, UiEventType.MouseDown, 0, 10, 5)));   // open

        ChatChannelKind? fired = null;
        menu.OnChannelChanged = k => fired = k;

        // "Chat to All" (Say) is index 2 = left col, row 2: y in [-85,-68). Say is available.
        Assert.True(menu.OnEvent(new UiEvent(0, menu, UiEventType.MouseDown, 0, 10, -76)));
        Assert.Equal(ChatChannelKind.Say, fired);
        Assert.Equal(ChatChannelKind.Say, menu.Selected);
    }

    [Fact]
    public void Select_AvailableRightColumnItem_FiresChannel()
    {
        var menu = new UiChannelMenu { Width = 80f, Height = 18f };
        Assert.True(menu.OnEvent(new UiEvent(0, menu, UiEventType.MouseDown, 0, 10, 5)));   // open

        ChatChannelKind? fired = null;
        menu.OnChannelChanged = k => fired = k;

        // "Tell to Trade Chat" (Trade) is index 11 = right col (lx>=191), row 4: y in [-51,-34).
        Assert.True(menu.OnEvent(new UiEvent(0, menu, UiEventType.MouseDown, 0, 200, -42)));
        Assert.Equal(ChatChannelKind.Trade, fired);
        Assert.Equal(ChatChannelKind.Trade, menu.Selected);
    }

    [Fact]
    public void Select_SpecialItem_DoesNotFire()
    {
        var menu = new UiChannelMenu { Width = 80f, Height = 18f };
        Assert.True(menu.OnEvent(new UiEvent(0, menu, UiEventType.MouseDown, 0, 10, 5)));   // open
        int fired = 0;
        menu.OnChannelChanged = _ => fired++;

        // "Squelch (ignore)" is index 0 = left col, row 0 (null channel): y in [-119,-102).
        Assert.True(menu.OnEvent(new UiEvent(0, menu, UiEventType.MouseDown, 0, 10, -110)));
        Assert.Equal(0, fired);
    }

    [Fact]
    public void Select_UnavailableChannel_DoesNotFire()
    {
        var menu = new UiChannelMenu { Width = 80f, Height = 18f };
        Assert.True(menu.OnEvent(new UiEvent(0, menu, UiEventType.MouseDown, 0, 10, 5)));   // open
        int fired = 0;
        menu.OnChannelChanged = _ => fired++;

        // "Tell to Fellows" (Fellowship) is index 3 = left col, row 3: y in [-68,-51).
        // Fellowship is unavailable by the default static gate, so the click is inert.
        Assert.True(menu.OnEvent(new UiEvent(0, menu, UiEventType.MouseDown, 0, 10, -60)));
        Assert.Equal(0, fired);
    }

    [Fact]
    public void AvailabilityProvider_Overrides_DefaultGate()
    {
        var menu = new UiChannelMenu { Width = 80f, Height = 18f, AvailabilityProvider = _ => true };
        Assert.True(menu.OnEvent(new UiEvent(0, menu, UiEventType.MouseDown, 0, 10, 5)));   // open

        ChatChannelKind? fired = null;
        menu.OnChannelChanged = k => fired = k;

        // With every channel available, "Tell to Fellows" (idx 3, row 3) now fires.
        Assert.True(menu.OnEvent(new UiEvent(0, menu, UiEventType.MouseDown, 0, 10, -60)));
        Assert.Equal(ChatChannelKind.Fellowship, fired);
    }
}