using AcDream.Core.Chat;
using AcDream.Runtime.Chat;
using AcDream.Runtime.Gameplay;

namespace AcDream.Runtime.Tests.Chat;

/// <summary>
/// Owner direction 2026-09-07 (verbatim): "Unknown commands like /vt or
/// stuff from plugins shall now go to the SpewBox. They should go to the
/// chatbox." Register row AD-124 records the deviation from retail's own
/// ClientLocal (0x1A) typing for exactly these two families. This file pins
/// the <see cref="ChatCommandRouter"/> half of that change at the Runtime
/// layer — <see cref="RuntimeChatCommandFeedback"/> bound to a real
/// <see cref="RuntimeCommunicationState"/> — since the existing router
/// coverage in <c>AcDream.UI.Abstractions.Tests</c> only exercises the
/// <c>ChatVM</c> feedback implementation. The plugin-text half is pinned at
/// the App layer (<c>AppAutomationSurfaceTests.PostSystemMessage_RoutesToChatLog_NeverSpewBox</c>),
/// since <c>AppAutomationSurface</c> is the App-layer production
/// implementation of <c>IPluginChat</c>.
/// </summary>
public sealed class ChatCommandRouterFeedbackRoutingTests
{
    [Fact]
    public void DegeneratePrefix_UnknownCommandRefusal_RoutesToChatLog_NeverSpewBox()
    {
        // "/" alone (no letter verb) is the degenerate-prefix guard's
        // "Unknown command: {verb}." refusal — retail itself types this
        // 0x1A (ClientLocal / SpewBox-only); the owner override moves it to
        // the chat scroll (Default/0x00) instead.
        using var communication = new RuntimeCommunicationState();
        var feedback = new RuntimeChatCommandFeedback(communication);

        SubmitOutcome outcome = ChatCommandRouter.Submit(
            "/", feedback, NullCommandBus.Instance, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.UnknownCommand, outcome);
        ChatEntry entry = Assert.Single(communication.Chat.Snapshot());
        Assert.Contains("Unknown command:", entry.Text);
        Assert.Equal((uint)RetailLogTextType.Default, entry.LogTextType);

        communication.SpewBox.Tick(0d);
        Assert.Equal(0, communication.SpewBox.Count);
    }

    [Fact]
    public void HelpUnresolvedVerb_UnknownCommandText_RoutesToChatLog_NeverSpewBox()
    {
        // "/help nonsenseverb" hits EmitVerbHelp's final unresolved-verb
        // fallback (RetailCommandHelpTable.UnknownCommand), the exact
        // existing retail-swept text — only the destination changes.
        using var communication = new RuntimeCommunicationState();
        var feedback = new RuntimeChatCommandFeedback(communication);

        SubmitOutcome outcome = ChatCommandRouter.Submit(
            "/help nonsenseverb", feedback, NullCommandBus.Instance, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.ClientHandled, outcome);
        ChatEntry entry = Assert.Single(communication.Chat.Snapshot());
        Assert.Equal(RetailCommandHelpTable.UnknownCommand, entry.Text);
        Assert.Equal((uint)RetailLogTextType.Default, entry.LogTextType);

        communication.SpewBox.Tick(0d);
        Assert.Equal(0, communication.SpewBox.Count);
    }

    [Fact]
    public void HelpConfirmedNullVerb_UnknownCommandText_RoutesToChatLog_NeverSpewBox()
    {
        // "index" is one of the four catalog verbs retail registers with a
        // genuinely NULL help pointer (RetailCommandHelpTable.
        // CatalogVerbsWithNoRetailHelp) — EmitVerbHelp's OTHER "Unknown
        // command" call site, distinct from the unresolved-verb fallback
        // above.
        using var communication = new RuntimeCommunicationState();
        var feedback = new RuntimeChatCommandFeedback(communication);

        SubmitOutcome outcome = ChatCommandRouter.Submit(
            "/help index", feedback, NullCommandBus.Instance, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.ClientHandled, outcome);
        ChatEntry entry = Assert.Single(communication.Chat.Snapshot());
        Assert.Equal(RetailCommandHelpTable.UnknownCommand, entry.Text);
        Assert.Equal((uint)RetailLogTextType.Default, entry.LogTextType);

        communication.SpewBox.Tick(0d);
        Assert.Equal(0, communication.SpewBox.Count);
    }

    [Fact]
    public void RealCommandBadArguments_StillRoutesToSpewBox_NeverChatLog()
    {
        // Boundary pin: AP-183's bad-argument refusals of REAL retail
        // commands are UNCHANGED by the owner's 2026-09-07 direction, which
        // named only unknown commands and plugin text. "/ls now" (Lifestone
        // with bad args) must still land in the SpewBox exclusively.
        using var communication = new RuntimeCommunicationState();
        var feedback = new RuntimeChatCommandFeedback(communication);

        SubmitOutcome outcome = ChatCommandRouter.Submit(
            "/ls now", feedback, NullCommandBus.Instance, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.ClientHandled, outcome);
        Assert.Empty(communication.Chat.Snapshot());

        communication.SpewBox.Tick(0d);
        Assert.Equal(1, communication.SpewBox.Count);
        Assert.Equal(
            "Please see @help lifestone for more information on how to use this command.",
            communication.SpewBox.Snapshot()[0].Text);
    }
}