using AcDream.Core.Chat;
using AcDream.UI.Abstractions.Panels.Chat;

namespace AcDream.UI.Abstractions.Tests.Panels.Chat;

/// <summary>
/// Phase I.4: when the user submits text via the chat input field, the
/// panel must publish a <see cref="SendChatCmd"/> to the command bus.
/// We exercise the full Render path with the <see cref="FakePanelRenderer"/>
/// pre-loading a "submitted" string and a recording bus capturing the
/// resulting command.
/// </summary>
public sealed class ChatPanelInputTests
{
    private sealed class RecordingBus : ICommandBus
    {
        public List<object> Published { get; } = new();
        public void Publish<T>(T command) where T : notnull => Published.Add(command);
    }

    [Fact]
    public void Submit_HelpCommand_RendersLocalHelpAndDoesNotPublish()
    {
        // Phase J follow-up: client-side commands (/help, /?, /h) are
        // intercepted before the parser. They render a local cheat-sheet
        // via ChatLog.OnSystemMessage and do NOT round-trip the server
        // — that's what prevented the "Unknown command: help" duplicate
        // ACE was firing back.
        var log = new ChatLog();
        var vm  = new ChatVM(log);
        var panel = new ChatPanel(vm);
        var bus = new RecordingBus();
        var renderer = new FakePanelRenderer
        {
            InputTextSubmitNextSubmitted = "/help",
            InputTextSubmitNextBufferAfter = "",
        };

        panel.Render(new PanelContext(0.016f, bus), renderer);

        Assert.Empty(bus.Published);
        var entry = Assert.Single(log.Snapshot());
        Assert.Equal(ChatKind.System, entry.Kind);
        Assert.Contains("acdream chat commands:", entry.Text);
        Assert.Contains("/tell", entry.Text);
    }

    [Theory]
    [InlineData("/?")]
    [InlineData("/h")]
    [InlineData("/HELP")]
    public void Submit_HelpAliases_AlsoRenderLocalHelp(string raw)
    {
        var log = new ChatLog();
        var vm  = new ChatVM(log);
        var panel = new ChatPanel(vm);
        var bus = new RecordingBus();
        var renderer = new FakePanelRenderer
        {
            InputTextSubmitNextSubmitted = raw,
            InputTextSubmitNextBufferAfter = "",
        };

        panel.Render(new PanelContext(0.016f, bus), renderer);

        Assert.Empty(bus.Published);
        Assert.Single(log.Snapshot());
    }

    [Fact]
    public void Submit_ClearCommand_DrainsLog_AndDoesNotPublish()
    {
        var log = new ChatLog();
        log.OnSystemMessage("seed line", chatType: 0);
        var vm  = new ChatVM(log);
        var panel = new ChatPanel(vm);
        var bus = new RecordingBus();
        var renderer = new FakePanelRenderer
        {
            InputTextSubmitNextSubmitted = "/clear",
            InputTextSubmitNextBufferAfter = "",
        };

        panel.Render(new PanelContext(0.016f, bus), renderer);

        Assert.Empty(bus.Published);
        Assert.Empty(log.Snapshot());
    }

    [Fact]
    public void Submit_PlainText_PublishesSayCommand()
    {
        var log = new ChatLog();
        var vm  = new ChatVM(log);
        var panel = new ChatPanel(vm);
        var bus = new RecordingBus();
        var renderer = new FakePanelRenderer
        {
            InputTextSubmitNextSubmitted = "hello world",
            InputTextSubmitNextBufferAfter = "",
        };

        panel.Render(new PanelContext(0.016f, bus), renderer);

        var cmd = Assert.Single(bus.Published);
        var sendCmd = Assert.IsType<SendChatCmd>(cmd);
        Assert.Equal(ChatChannelKind.Say, sendCmd.Channel);
        Assert.Null(sendCmd.TargetName);
        Assert.Equal("hello world", sendCmd.Text);
    }

    [Fact]
    public void Submit_TellSlashCommand_PublishesTellCommand()
    {
        var log = new ChatLog();
        var vm  = new ChatVM(log);
        var panel = new ChatPanel(vm);
        var bus = new RecordingBus();
        var renderer = new FakePanelRenderer
        {
            InputTextSubmitNextSubmitted = "/t Bestie ping",
            InputTextSubmitNextBufferAfter = "",
        };

        panel.Render(new PanelContext(0.016f, bus), renderer);

        var sendCmd = Assert.IsType<SendChatCmd>(Assert.Single(bus.Published));
        Assert.Equal(ChatChannelKind.Tell, sendCmd.Channel);
        Assert.Equal("Bestie", sendCmd.TargetName);
        Assert.Equal("ping", sendCmd.Text);
    }

    [Fact]
    public void Submit_ReplySlashCommand_UsesLastIncomingTellSender()
    {
        var log = new ChatLog();
        var vm  = new ChatVM(log);
        log.OnTellReceived("Bestie", "ping", senderGuid: 0x5000_00AAu);

        var panel = new ChatPanel(vm);
        var bus = new RecordingBus();
        var renderer = new FakePanelRenderer
        {
            InputTextSubmitNextSubmitted = "/r back at you",
            InputTextSubmitNextBufferAfter = "",
        };

        panel.Render(new PanelContext(0.016f, bus), renderer);

        var sendCmd = Assert.IsType<SendChatCmd>(Assert.Single(bus.Published));
        Assert.Equal(ChatChannelKind.Tell, sendCmd.Channel);
        Assert.Equal("Bestie", sendCmd.TargetName);
        Assert.Equal("back at you", sendCmd.Text);
    }

    [Fact]
    public void Submit_EmptyOrWhitespace_PublishesNothing()
    {
        var log = new ChatLog();
        var vm  = new ChatVM(log);
        var panel = new ChatPanel(vm);
        var bus = new RecordingBus();
        var renderer = new FakePanelRenderer
        {
            InputTextSubmitNextSubmitted = "   ",
            InputTextSubmitNextBufferAfter = "",
        };

        panel.Render(new PanelContext(0.016f, bus), renderer);

        Assert.Empty(bus.Published);
    }

    [Fact]
    public void NoSubmit_PublishesNothing()
    {
        // Most frames: user is typing or idle; submitted == null.
        var log = new ChatLog();
        var vm  = new ChatVM(log);
        var panel = new ChatPanel(vm);
        var bus = new RecordingBus();
        var renderer = new FakePanelRenderer
        {
            InputTextSubmitNextSubmitted = null,
        };

        panel.Render(new PanelContext(0.016f, bus), renderer);

        Assert.Empty(bus.Published);
    }

    [Fact]
    public void Render_AlwaysCallsInputTextSubmit_ToShowTheField()
    {
        var log = new ChatLog();
        var vm  = new ChatVM(log);
        var panel = new ChatPanel(vm);
        var bus = new RecordingBus();
        var renderer = new FakePanelRenderer
        {
            InputTextSubmitNextSubmitted = null,
        };

        panel.Render(new PanelContext(0.016f, bus), renderer);

        Assert.Contains(renderer.Calls, c => c.Method == "InputTextSubmit");
    }
}