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

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

public class ChatCommandRouterTests
{
    private sealed class CaptureBus : ICommandBus
    {
        public List<object> Published { get; } = new();

        public void Publish<T>(T command) where T : notnull
            => Published.Add(command);
    }

    private static (ChatVM vm, ChatLog log, CaptureBus bus) Fixture()
    {
        var log = new ChatLog();
        var vm = new ChatVM(log, displayLimit: 50);
        return (vm, log, new CaptureBus());
    }

    /// <summary>
    /// #363: a fixture with <see cref="ChatVM.OnInterfaceText"/> wired to a
    /// capturing list, so tests can assert a 0x1A refusal reached the
    /// SpewBox seam directly instead of only observing the chat-log
    /// null-fallback.
    /// </summary>
    private static (ChatVM vm, ChatLog log, CaptureBus bus, List<string> interfaceTexts) FixtureWithInterfaceSink()
    {
        var log = new ChatLog();
        var interfaceTexts = new List<string>();
        var vm = new ChatVM(log, displayLimit: 50)
        {
            OnInterfaceText = interfaceTexts.Add,
        };
        return (vm, log, new CaptureBus(), interfaceTexts);
    }

    [Fact]
    public void PlainText_PublishesOnDefaultChannel()
    {
        var (vm, _, bus) = Fixture();
        var outcome = ChatCommandRouter.Submit("hello there", vm, bus, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.Sent, outcome);
        var command = Assert.IsType<SendChatCmd>(Assert.Single(bus.Published));
        Assert.Equal(ChatChannelKind.Say, command.Channel);
        Assert.Equal("hello there", command.Text);
    }

    [Fact]
    public void DefaultChannel_IsHonored()
    {
        var (vm, _, bus) = Fixture();
        ChatCommandRouter.Submit("hi", vm, bus, ChatChannelKind.Fellowship);

        var command = Assert.IsType<SendChatCmd>(Assert.Single(bus.Published));
        Assert.Equal(ChatChannelKind.Fellowship, command.Channel);
    }

    [Fact]
    public void ClearCommand_PublishesTypedRetailCommand()
    {
        var (vm, log, bus) = Fixture();
        log.OnSystemMessage("x", chatType: 0);

        var outcome = ChatCommandRouter.Submit("/clear", vm, bus, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.ClientHandled, outcome);
        var command = Assert.IsType<ExecuteClientCommandCmd>(Assert.Single(bus.Published));
        Assert.Equal(ClientCommandId.ClearChat, command.Command);
        Assert.Equal("", command.Arguments);
        Assert.Single(log.Snapshot());
    }

    [Theory]
    [InlineData("/lifestone")]
    [InlineData("/lif")]
    [InlineData("/ls")]
    [InlineData("@LS")]
    public void LifestoneAliases_PublishTypedClientCommand(string input)
    {
        var (vm, _, bus) = Fixture();

        var outcome = ChatCommandRouter.Submit(input, vm, bus, ChatChannelKind.Fellowship);

        Assert.Equal(SubmitOutcome.ClientHandled, outcome);
        var command = Assert.IsType<ExecuteClientCommandCmd>(Assert.Single(bus.Published));
        Assert.Equal(ClientCommandId.LifestoneRecall, command.Command);
    }

    [Fact]
    public void LifestoneWithArguments_ShowsRetailBadArgsRefusal_ViaInterfaceTextSeam()
    {
        // #363 / register row AP-183: a Definition with no bespoke
        // InvalidArgumentsText falls to retail's own generic bad-args
        // fallback (HandleFailureEvent(0x26), "That is not a valid
        // command.") at 0x1A ClientLocal — never the acdream-invented
        // "Usage: /lifestone" line this used to synthesize.
        var (vm, log, bus, interfaceTexts) = FixtureWithInterfaceSink();

        var outcome = ChatCommandRouter.Submit("/ls now", vm, bus, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.ClientHandled, outcome);
        Assert.Empty(bus.Published);
        Assert.Equal("That is not a valid command.", Assert.Single(interfaceTexts));
        Assert.Empty(log.Snapshot());
    }

    [Fact]
    public void LifestoneWithArguments_NoInterfaceSinkWired_FallsBackToChatLog_TaggedClientLocal()
    {
        // Headless / no-window null-fallback safety: when the App-layer
        // host hasn't wired ChatVM.OnInterfaceText, the refusal must still
        // reach the player instead of being silently dropped.
        var (vm, log, bus) = Fixture();

        var outcome = ChatCommandRouter.Submit("/ls now", vm, bus, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.ClientHandled, outcome);
        var entry = Assert.Single(log.Snapshot());
        Assert.Equal("That is not a valid command.", entry.Text);
        Assert.Equal((uint)RetailLogTextType.ClientLocal, entry.LogTextType);
    }

    [Fact]
    public void PkLiteAlias_ResolvesAsClientHandled_NotTheServerTextPath()
    {
        var (vm, _, bus) = Fixture();

        var outcome = ChatCommandRouter.Submit("@pklite", vm, bus, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.ClientHandled, outcome);
        var command = Assert.IsType<ExecuteClientCommandCmd>(Assert.Single(bus.Published));
        Assert.Equal(ClientCommandId.EnterPkLite, command.Command);
    }

    [Fact]
    public void UnknownSlashVerb_RoutesThroughExplicitServerCommand()
    {
        var (vm, log, bus) = Fixture();

        var outcome = ChatCommandRouter.Submit(
            "/notacommand", vm, bus, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.Sent, outcome);
        var command = Assert.IsType<SendServerCommandCmd>(Assert.Single(bus.Published));
        Assert.Equal("@notacommand", command.Text);
        Assert.DoesNotContain(log.Snapshot(), entry => entry.Text.Contains("Unknown command"));
    }

    [Theory]
    [InlineData("/ci 629 5")]
    [InlineData("@ci 629 5")]
    public void ServerCommandWithArgs_PublishesCanonicalAtForm_EvenOnChannelDefault(
        string input)
    {
        var (vm, _, bus) = Fixture();

        var outcome = ChatCommandRouter.Submit(
            input, vm, bus, ChatChannelKind.Fellowship);

        Assert.Equal(SubmitOutcome.Sent, outcome);
        var command = Assert.IsType<SendServerCommandCmd>(Assert.Single(bus.Published));
        Assert.Equal("@ci 629 5", command.Text);
    }

    [Fact]
    public void EmptyInput_DoesNothing()
    {
        var (vm, _, bus) = Fixture();

        var outcome = ChatCommandRouter.Submit("   ", vm, bus, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.Empty, outcome);
        Assert.Empty(bus.Published);
    }

    // ── Campaign CH slice CH4 (2026-08-09) ──────────────────────────────

    [Theory]
    [InlineData(":waves")]
    [InlineData(";waves")]
    public void EmotePrefix_RewritesToAtEmote(string raw)
    {
        var (vm, _, bus) = Fixture();

        var outcome = ChatCommandRouter.Submit(raw, vm, bus, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.ClientHandled, outcome);
        var command = Assert.IsType<ExecuteClientCommandCmd>(Assert.Single(bus.Published));
        Assert.Equal(ClientCommandId.Emote, command.Command);
        Assert.Equal("waves", command.Arguments);
    }

    [Fact]
    public void UnregisteredChannelTag_PublishesRawChannelBroadcast()
    {
        var (vm, _, bus) = Fixture();

        var outcome = ChatCommandRouter.Submit("/admin server is misbehaving", vm, bus, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.Sent, outcome);
        var command = Assert.IsType<SendRawChannelCmd>(Assert.Single(bus.Published));
        Assert.Equal(0x00000002u, command.ChannelId);
        Assert.Equal("server is misbehaving", command.Text);
    }

    [Fact]
    public void UnregisteredChannelTag_WithNoText_PassesThroughToServer()
    {
        // CH4 REJECT-review SHOULD-FIX 3 (2026-08-09): retail's
        // DoChannelCommand @0x005774A7 returns 0 SILENTLY on argc<=0 for an
        // UNREGISTERED tag; DoCommand's own final fallback then sends the
        // raw @-line to the server via Event_Talk. "You must specify the
        // text you wish to say!" belongs to DoStupidChannelHack
        // @0x0057B144, which only runs for REGISTERED channel verbs — it
        // must never appear for one of the 22 unregistered fallback tags.
        var (vm, log, bus) = Fixture();

        var outcome = ChatCommandRouter.Submit("/sentinel", vm, bus, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.Sent, outcome);
        var command = Assert.IsType<SendServerCommandCmd>(Assert.Single(bus.Published));
        Assert.Equal("@sentinel", command.Text);
        Assert.DoesNotContain(log.Snapshot(), entry => entry.Text.Contains("You must specify the text"));
    }

    // ── CH4 REJECT-review Blocker 1 (2026-08-09) ────────────────────────
    // "@allegiance <sub>" must never broadcast to the Allegiance channel
    // or reach the server for an unrecognized subcommand — retail's own
    // DoAllegiance claims the entire verb unconditionally and shows its
    // own client-local refusal.

    [Theory]
    [InlineData("/allegiance boot Bob")]
    [InlineData("/all boot Bob")]
    public void AllegianceUnrecognizedSubcommand_ShowsRetailRefusal_NeverBroadcastsOrSends(string input)
    {
        // #363 / register row AP-183: retail types this refusal 0x1A
        // (ClientLocal / SpewBox-only) — routed through the interface-text
        // seam, not the chat log.
        var (vm, log, bus, interfaceTexts) = FixtureWithInterfaceSink();

        var outcome = ChatCommandRouter.Submit(input, vm, bus, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.ClientHandled, outcome);
        Assert.Empty(bus.Published); // no SendRawChannelCmd, no SendServerCommandCmd
        Assert.Equal(
            "Please see @help Allegiance for more information on how to use this command.",
            Assert.Single(interfaceTexts));
        Assert.Empty(log.Snapshot());
    }

    [Fact]
    public void RegisteredChannelVerb_NeverReachesTheRawFallback()
    {
        // "/f" is a KNOWN ChatInputParser verb (Fellowship) — it must ride
        // the normal SendChatCmd/self-echo path, not the raw fallback.
        var (vm, _, bus) = Fixture();

        var outcome = ChatCommandRouter.Submit("/f hi gang", vm, bus, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.Sent, outcome);
        var command = Assert.IsType<SendChatCmd>(Assert.Single(bus.Published));
        Assert.Equal(ChatChannelKind.Fellowship, command.Channel);
    }

    [Fact]
    public void HelpVerb_ShowsCatalogHelpText()
    {
        var (vm, log, bus) = Fixture();

        var outcome = ChatCommandRouter.Submit("/help lifestone", vm, bus, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.ClientHandled, outcome);
        Assert.Empty(bus.Published);
        Assert.Contains(log.Snapshot(), entry => entry.Text.Contains("Returns you to the last lifestone"));
    }

    // Campaign CH user-gate round 3 (2026-08-10), finding (c): a resolved
    // verb prints retail's DoHelp SHAPE, not just its content — the SAME
    // HelpPrefixNote entry every /help path prints, then a SECOND entry
    // that is ForMoreInformationPrefix concatenated directly onto the
    // verb's own detail text (no blank line, no separate third entry).
    [Theory]
    [InlineData("/help mr", "@mr <text> - Sends the text to the last person who used @m to send  you a message. This only works for monarchs.")]
    [InlineData("/help pr", "@pr <text> - Sends the text to the last vassal who used @p to send  you a message.")]
    public void HelpVerb_MrPr_ShowsVerbatimRetailText(string input, string expected)
    {
        // CH4 REJECT-review SHOULD-FIX 7 (2026-08-09): these were
        // previously fabricated acdream summaries; now the verbatim retail
        // strings from data_7daa08/data_7daa80 (the double space before
        // "you" is confirmed byte-level, not a typo).
        var (vm, log, bus) = Fixture();

        var outcome = ChatCommandRouter.Submit(input, vm, bus, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.ClientHandled, outcome);
        var entries = log.Snapshot();
        Assert.Equal(2, entries.Length);
        Assert.Equal(RetailCommandHelpTable.HelpPrefixNote, entries[0].Text);
        Assert.Equal(RetailCommandHelpTable.ForMoreInformationPrefix + expected, entries[1].Text);
    }

    [Fact]
    public void HelpVerb_UnknownVerb_ShowsRetailUnknownCommandText_ViaInterfaceTextSeam()
    {
        // Campaign CH user-gate round 3 (2026-08-10): retail's own DoHelp
        // fallback text is "Unknown command" (swept verbatim), not an
        // acdream-invented "No help available" message. Retail types this
        // 0x1A (ClientLocal / SpewBox-only). Issue #363/#367: now routed
        // through the interface-text seam as ONE entry (no HelpPrefixNote
        // wrapper — DoHelp's fallback bypasses the two-entry shape
        // entirely), not the chat scroll.
        var (vm, log, bus, interfaceTexts) = FixtureWithInterfaceSink();

        var outcome = ChatCommandRouter.Submit("/help nonsenseverb", vm, bus, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.ClientHandled, outcome);
        Assert.Empty(bus.Published);
        Assert.Equal(RetailCommandHelpTable.UnknownCommand, Assert.Single(interfaceTexts));
        Assert.Empty(log.Snapshot());
    }

    [Fact]
    public void HelpVerb_UnknownVerb_NoInterfaceSinkWired_FallsBackToChatLog_TaggedClientLocal()
    {
        var (vm, log, bus) = Fixture();

        var outcome = ChatCommandRouter.Submit("/help nonsenseverb", vm, bus, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.ClientHandled, outcome);
        var entry = Assert.Single(log.Snapshot());
        Assert.Equal(RetailCommandHelpTable.UnknownCommand, entry.Text);
        Assert.Equal((uint)RetailLogTextType.ClientLocal, entry.LogTextType);
    }

    [Fact]
    public void HelpBare_ShowsRetailTwoEntryShape()
    {
        // Campaign CH user-gate round 3 (2026-08-10), finding (b): bare
        // /help must emit retail's real two-entry sequence (Note, then the
        // 13-item "Available help:" listing) — not the previous
        // acdream-invented single-blob cheat sheet.
        var (vm, log, bus) = Fixture();

        var outcome = ChatCommandRouter.Submit("/help", vm, bus, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.ClientHandled, outcome);
        var entries = log.Snapshot();
        Assert.Equal(2, entries.Length);
        Assert.Equal(RetailCommandHelpTable.HelpPrefixNote, entries[0].Text);
        Assert.Equal(RetailCommandHelpTable.AvailableHelpListing, entries[1].Text);
    }

    // ── Issue #363 / register row AP-183 (2026-08-10) ───────────────────
    // Retail's 0x1A (ClientLocal / SpewBox-only) command-refusal call
    // sites now route through ChatVM.OnInterfaceText instead of the chat
    // scroll. Each site below is pinned two ways: with the seam wired
    // (reaches the SpewBox sink, log stays empty) and with it unwired
    // (safe null-fallback into chat, tagged ClientLocal).

    [Theory]
    [InlineData("/clist")]
    [InlineData("/clist a b")]
    [InlineData("/on")]
    [InlineData("/off nonsense extra")]
    public void ChannelListOnOff_BadArgumentShape_ShowsRetailRefusal_ViaInterfaceTextSeam(string input)
    {
        var (vm, log, bus, interfaceTexts) = FixtureWithInterfaceSink();

        var outcome = ChatCommandRouter.Submit(input, vm, bus, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.ClientHandled, outcome);
        Assert.Empty(bus.Published);
        Assert.Equal("Please specify the channel name.", Assert.Single(interfaceTexts));
        Assert.Empty(log.Snapshot());
    }

    [Fact]
    public void HouseAvailableList_BadHouseType_ShowsRetailRefusal_ViaInterfaceTextSeam()
    {
        var (vm, log, bus, interfaceTexts) = FixtureWithInterfaceSink();

        var outcome = ChatCommandRouter.Submit("/hslist nonsense", vm, bus, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.ClientHandled, outcome);
        Assert.Empty(bus.Published);
        Assert.Equal(
            "Please see @help hslist for more information on how to use this command",
            Assert.Single(interfaceTexts));
        Assert.Empty(log.Snapshot());
    }

    [Theory]
    [InlineData("/g")]
    [InlineData("/f")]
    [InlineData("/fellowship")]
    [InlineData("/a")]
    [InlineData("/ab")]
    [InlineData("/m")]
    [InlineData("/p")]
    [InlineData("/v")]
    [InlineData("/c")]
    public void BareRegisteredChannelVerb_ShowsDoStupidChannelHackRefusal_ViaInterfaceTextSeam(string input)
    {
        // Retail ClientCommunicationSystem::DoStupidChannelHack
        // @0x0057B144 — a registered legacy-channel verb with no message
        // refuses locally instead of silently dropping the line.
        var (vm, log, bus, interfaceTexts) = FixtureWithInterfaceSink();

        var outcome = ChatCommandRouter.Submit(input, vm, bus, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.ClientHandled, outcome);
        Assert.Empty(bus.Published);
        Assert.Equal("You must specify the text you wish to say!", Assert.Single(interfaceTexts));
        Assert.Empty(log.Snapshot());
    }

    [Theory]
    [InlineData("/lfg")]
    [InlineData("/trade")]
    [InlineData("/general")]
    [InlineData("/roleplay")]
    [InlineData("/society")]
    [InlineData("/olthoi")]
    public void BareTurbineOnlyChannelVerb_NeverShowsDoStupidChannelHackRefusal(string input)
    {
        // The seven Turbine-only channels are never DoStupidChannelHack's
        // clients (command-registry doc §2.3) — a bare verb here is
        // silently dropped, matching the pre-#363 behavior for these
        // specific channels (unchanged by this fix).
        var (vm, log, bus, interfaceTexts) = FixtureWithInterfaceSink();

        var outcome = ChatCommandRouter.Submit(input, vm, bus, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.Dropped, outcome);
        Assert.Empty(bus.Published);
        Assert.Empty(interfaceTexts);
        Assert.Empty(log.Snapshot());
    }

    [Fact]
    public void Reply_WithMessage_NoLastTeller_ShowsDoReplyRefusal_ViaInterfaceTextSeam()
    {
        // Retail ClientCommunicationSystem::DoReply @0x00577910 —
        // gmCCommunicationSystem::GetLastTeller() == 0 branch.
        var (vm, log, bus, interfaceTexts) = FixtureWithInterfaceSink();

        var outcome = ChatCommandRouter.Submit("/r hi there", vm, bus, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.ClientHandled, outcome);
        Assert.Empty(bus.Published);
        Assert.Equal("Someone must @tell you first!", Assert.Single(interfaceTexts));
        Assert.Empty(log.Snapshot());
    }

    [Fact]
    public void Reply_WithMessage_NoLastTeller_NoInterfaceSinkWired_FallsBackToChatLog_TaggedClientLocal()
    {
        var (vm, log, bus) = Fixture();

        var outcome = ChatCommandRouter.Submit("/reply hi there", vm, bus, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.ClientHandled, outcome);
        var entry = Assert.Single(log.Snapshot());
        Assert.Equal("Someone must @tell you first!", entry.Text);
        Assert.Equal((uint)RetailLogTextType.ClientLocal, entry.LogTextType);
    }

    [Fact]
    public void Reply_WithMessage_WithLastTeller_StillSendsNormally()
    {
        // Sanity: the new missing-last-teller predicate must not shadow
        // the ordinary reply path once a Tell has arrived.
        var (vm, log, bus, interfaceTexts) = FixtureWithInterfaceSink();
        log.OnTellReceived("Bestie", "psst", senderGuid: 0x5000_0042, logTextType: 0x03u);

        var outcome = ChatCommandRouter.Submit("/r hi there", vm, bus, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.Sent, outcome);
        var command = Assert.IsType<SendChatCmd>(Assert.Single(bus.Published));
        Assert.Equal("Bestie", command.TargetName);
        Assert.Empty(interfaceTexts);
    }

    [Fact]
    public void DegeneratePrefix_UnknownCommand_ShowsRefusal_ViaInterfaceTextSeam()
    {
        // "/" alone (no letter verb) — the pre-existing "Unknown command:
        // {verb}." refusal, now also routed through the interface-text
        // seam (issue #367).
        var (vm, log, bus, interfaceTexts) = FixtureWithInterfaceSink();

        var outcome = ChatCommandRouter.Submit("/", vm, bus, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.UnknownCommand, outcome);
        Assert.Empty(bus.Published);
        Assert.Contains("Unknown command:", Assert.Single(interfaceTexts));
        Assert.Empty(log.Snapshot());
    }

    [Fact]
    public void EnduranceCommand_ValidArguments_NeverTouchesTheInterfaceTextSeam()
    {
        // AP-183 sanity check: DoEndurance/DoSpeaker/DoTitle are ALREADY
        // correct at 0x00 (informational) — their actual output text is
        // produced by ClientCommandController (App layer), not
        // ChatCommandRouter, so this pins that a valid catalog dispatch
        // never emits through the new 0x1A seam at all.
        var (vm, _, bus, interfaceTexts) = FixtureWithInterfaceSink();

        var outcome = ChatCommandRouter.Submit("/endurance", vm, bus, ChatChannelKind.Say);

        Assert.Equal(SubmitOutcome.ClientHandled, outcome);
        var command = Assert.IsType<ExecuteClientCommandCmd>(Assert.Single(bus.Published));
        Assert.Equal(ClientCommandId.Endurance, command.Command);
        Assert.Empty(interfaceTexts);
    }
}