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

namespace AcDream.App.Tests.UI;

public class UiChannelMenuTests
{
    [Fact]
    public void Items_HasExpected14Entries()
    {
        // Retail gmMainChatUI::InitTalkFocusMenu: squelch + tell-selected + 12 channels.
        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);          // special item, no 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()
    {
        var menu = new UiChannelMenu();
        Assert.Equal(ChatChannelKind.Say, menu.Selected);
    }

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

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

        // PopupH = 7*16 = 112, top = -112. "Chat to All" (Say) is index 2 = left col, row 2:
        // y in [-112+32, -112+48) = [-80,-64). Click (lx=10 < ColW, ly=-72) → idx 2 → Say.
        var selEvt = new UiEvent(0, menu, UiEventType.MouseDown, 0, 10, -72);
        Assert.True(menu.OnEvent(selEvt));
        Assert.Equal(ChatChannelKind.Say, fired);
        Assert.Equal(ChatChannelKind.Say, menu.Selected);
    }

    [Fact]
    public void Select_RightColumnItem_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 Monarch" is index 7 = right col (lx >= ColW 150), row 0:
        // y in [-112, -96). Click (lx=160, ly=-104) → col 1, row 0 → idx 7 → Monarch.
        Assert.True(menu.OnEvent(new UiEvent(0, menu, UiEventType.MouseDown, 0, 160, -104)));
        Assert.Equal(ChatChannelKind.Monarch, fired);
        Assert.Equal(ChatChannelKind.Monarch, 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: y in [-112, -96). No channel.
        Assert.True(menu.OnEvent(new UiEvent(0, menu, UiEventType.MouseDown, 0, 10, -104)));
        Assert.Equal(0, fired);                                // special item is a no-op
    }
}