package agent

import (
	"context"
	"fmt"
	"os"
	"path/filepath"
	"testing"
	"time"

	"github.com/sipeed/picoclaw/pkg/bus"
	"github.com/sipeed/picoclaw/pkg/channels"
	"github.com/sipeed/picoclaw/pkg/config"
	"github.com/sipeed/picoclaw/pkg/providers"
	"github.com/sipeed/picoclaw/pkg/tools"
)

type fakeChannel struct{ id string }

func (f *fakeChannel) Name() string                                            { return "fake" }
func (f *fakeChannel) Start(ctx context.Context) error                         { return nil }
func (f *fakeChannel) Stop(ctx context.Context) error                          { return nil }
func (f *fakeChannel) Send(ctx context.Context, msg bus.OutboundMessage) error { return nil }
func (f *fakeChannel) IsRunning() bool                                         { return true }
func (f *fakeChannel) IsAllowed(string) bool                                   { return true }
func (f *fakeChannel) IsAllowedSender(sender bus.SenderInfo) bool              { return true }
func (f *fakeChannel) ReasoningChannelID() string                              { return f.id }

func TestRecordLastChannel(t *testing.T) {
	// Create temp workspace
	tmpDir, err := os.MkdirTemp("", "agent-test-*")
	if err != nil {
		t.Fatalf("Failed to create temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)

	// Create test config
	cfg := &config.Config{
		Agents: config.AgentsConfig{
			Defaults: config.AgentDefaults{
				Workspace:         tmpDir,
				Model:             "test-model",
				MaxTokens:         4096,
				MaxToolIterations: 10,
			},
		},
	}

	// Create agent loop
	msgBus := bus.NewMessageBus()
	provider := &mockProvider{}
	al := NewAgentLoop(cfg, msgBus, provider)

	// Test RecordLastChannel
	testChannel := "test-channel"
	err = al.RecordLastChannel(testChannel)
	if err != nil {
		t.Fatalf("RecordLastChannel failed: %v", err)
	}

	// Verify channel was saved
	lastChannel := al.state.GetLastChannel()
	if lastChannel != testChannel {
		t.Errorf("Expected channel '%s', got '%s'", testChannel, lastChannel)
	}

	// Verify persistence by creating a new agent loop
	al2 := NewAgentLoop(cfg, msgBus, provider)
	if al2.state.GetLastChannel() != testChannel {
		t.Errorf("Expected persistent channel '%s', got '%s'", testChannel, al2.state.GetLastChannel())
	}
}

func TestRecordLastChatID(t *testing.T) {
	// Create temp workspace
	tmpDir, err := os.MkdirTemp("", "agent-test-*")
	if err != nil {
		t.Fatalf("Failed to create temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)

	// Create test config
	cfg := &config.Config{
		Agents: config.AgentsConfig{
			Defaults: config.AgentDefaults{
				Workspace:         tmpDir,
				Model:             "test-model",
				MaxTokens:         4096,
				MaxToolIterations: 10,
			},
		},
	}

	// Create agent loop
	msgBus := bus.NewMessageBus()
	provider := &mockProvider{}
	al := NewAgentLoop(cfg, msgBus, provider)

	// Test RecordLastChatID
	testChatID := "test-chat-id-123"
	err = al.RecordLastChatID(testChatID)
	if err != nil {
		t.Fatalf("RecordLastChatID failed: %v", err)
	}

	// Verify chat ID was saved
	lastChatID := al.state.GetLastChatID()
	if lastChatID != testChatID {
		t.Errorf("Expected chat ID '%s', got '%s'", testChatID, lastChatID)
	}

	// Verify persistence by creating a new agent loop
	al2 := NewAgentLoop(cfg, msgBus, provider)
	if al2.state.GetLastChatID() != testChatID {
		t.Errorf("Expected persistent chat ID '%s', got '%s'", testChatID, al2.state.GetLastChatID())
	}
}

func TestNewAgentLoop_StateInitialized(t *testing.T) {
	// Create temp workspace
	tmpDir, err := os.MkdirTemp("", "agent-test-*")
	if err != nil {
		t.Fatalf("Failed to create temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)

	// Create test config
	cfg := &config.Config{
		Agents: config.AgentsConfig{
			Defaults: config.AgentDefaults{
				Workspace:         tmpDir,
				Model:             "test-model",
				MaxTokens:         4096,
				MaxToolIterations: 10,
			},
		},
	}

	// Create agent loop
	msgBus := bus.NewMessageBus()
	provider := &mockProvider{}
	al := NewAgentLoop(cfg, msgBus, provider)

	// Verify state manager is initialized
	if al.state == nil {
		t.Error("Expected state manager to be initialized")
	}

	// Verify state directory was created
	stateDir := filepath.Join(tmpDir, "state")
	if _, err := os.Stat(stateDir); os.IsNotExist(err) {
		t.Error("Expected state directory to exist")
	}
}

// TestToolRegistry_ToolRegistration verifies tools can be registered and retrieved
func TestToolRegistry_ToolRegistration(t *testing.T) {
	tmpDir, err := os.MkdirTemp("", "agent-test-*")
	if err != nil {
		t.Fatalf("Failed to create temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)

	cfg := &config.Config{
		Agents: config.AgentsConfig{
			Defaults: config.AgentDefaults{
				Workspace:         tmpDir,
				Model:             "test-model",
				MaxTokens:         4096,
				MaxToolIterations: 10,
			},
		},
	}

	msgBus := bus.NewMessageBus()
	provider := &mockProvider{}
	al := NewAgentLoop(cfg, msgBus, provider)

	// Register a custom tool
	customTool := &mockCustomTool{}
	al.RegisterTool(customTool)

	// Verify tool is registered by checking it doesn't panic on GetStartupInfo
	// (actual tool retrieval is tested in tools package tests)
	info := al.GetStartupInfo()
	toolsInfo := info["tools"].(map[string]any)
	toolsList := toolsInfo["names"].([]string)

	// Check that our custom tool name is in the list
	found := false
	for _, name := range toolsList {
		if name == "mock_custom" {
			found = true
			break
		}
	}
	if !found {
		t.Error("Expected custom tool to be registered")
	}
}

// TestToolContext_Updates verifies tool context is updated with channel/chatID
func TestToolContext_Updates(t *testing.T) {
	tmpDir, err := os.MkdirTemp("", "agent-test-*")
	if err != nil {
		t.Fatalf("Failed to create temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)

	cfg := &config.Config{
		Agents: config.AgentsConfig{
			Defaults: config.AgentDefaults{
				Workspace:         tmpDir,
				Model:             "test-model",
				MaxTokens:         4096,
				MaxToolIterations: 10,
			},
		},
	}

	msgBus := bus.NewMessageBus()
	provider := &simpleMockProvider{response: "OK"}
	_ = NewAgentLoop(cfg, msgBus, provider)

	// Verify that ContextualTool interface is defined and can be implemented
	// This test validates the interface contract exists
	ctxTool := &mockContextualTool{}

	// Verify the tool implements the interface correctly
	var _ tools.ContextualTool = ctxTool
}

// TestToolRegistry_GetDefinitions verifies tool definitions can be retrieved
func TestToolRegistry_GetDefinitions(t *testing.T) {
	tmpDir, err := os.MkdirTemp("", "agent-test-*")
	if err != nil {
		t.Fatalf("Failed to create temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)

	cfg := &config.Config{
		Agents: config.AgentsConfig{
			Defaults: config.AgentDefaults{
				Workspace:         tmpDir,
				Model:             "test-model",
				MaxTokens:         4096,
				MaxToolIterations: 10,
			},
		},
	}

	msgBus := bus.NewMessageBus()
	provider := &mockProvider{}
	al := NewAgentLoop(cfg, msgBus, provider)

	// Register a test tool and verify it shows up in startup info
	testTool := &mockCustomTool{}
	al.RegisterTool(testTool)

	info := al.GetStartupInfo()
	toolsInfo := info["tools"].(map[string]any)
	toolsList := toolsInfo["names"].([]string)

	// Check that our custom tool name is in the list
	found := false
	for _, name := range toolsList {
		if name == "mock_custom" {
			found = true
			break
		}
	}
	if !found {
		t.Error("Expected custom tool to be registered")
	}
}

// TestAgentLoop_GetStartupInfo verifies startup info contains tools
func TestAgentLoop_GetStartupInfo(t *testing.T) {
	tmpDir, err := os.MkdirTemp("", "agent-test-*")
	if err != nil {
		t.Fatalf("Failed to create temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)

	cfg := &config.Config{
		Agents: config.AgentsConfig{
			Defaults: config.AgentDefaults{
				Workspace:         tmpDir,
				Model:             "test-model",
				MaxTokens:         4096,
				MaxToolIterations: 10,
			},
		},
	}

	msgBus := bus.NewMessageBus()
	provider := &mockProvider{}
	al := NewAgentLoop(cfg, msgBus, provider)

	info := al.GetStartupInfo()

	// Verify tools info exists
	toolsInfo, ok := info["tools"]
	if !ok {
		t.Fatal("Expected 'tools' key in startup info")
	}

	toolsMap, ok := toolsInfo.(map[string]any)
	if !ok {
		t.Fatal("Expected 'tools' to be a map")
	}

	count, ok := toolsMap["count"]
	if !ok {
		t.Fatal("Expected 'count' in tools info")
	}

	// Should have default tools registered
	if count.(int) == 0 {
		t.Error("Expected at least some tools to be registered")
	}
}

// TestAgentLoop_Stop verifies Stop() sets running to false
func TestAgentLoop_Stop(t *testing.T) {
	tmpDir, err := os.MkdirTemp("", "agent-test-*")
	if err != nil {
		t.Fatalf("Failed to create temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)

	cfg := &config.Config{
		Agents: config.AgentsConfig{
			Defaults: config.AgentDefaults{
				Workspace:         tmpDir,
				Model:             "test-model",
				MaxTokens:         4096,
				MaxToolIterations: 10,
			},
		},
	}

	msgBus := bus.NewMessageBus()
	provider := &mockProvider{}
	al := NewAgentLoop(cfg, msgBus, provider)

	// Note: running is only set to true when Run() is called
	// We can't test that without starting the event loop
	// Instead, verify the Stop method can be called safely
	al.Stop()

	// Verify running is false (initial state or after Stop)
	if al.running.Load() {
		t.Error("Expected agent to be stopped (or never started)")
	}
}

// Mock implementations for testing

type simpleMockProvider struct {
	response string
}

func (m *simpleMockProvider) Chat(
	ctx context.Context,
	messages []providers.Message,
	tools []providers.ToolDefinition,
	model string,
	opts map[string]any,
) (*providers.LLMResponse, error) {
	return &providers.LLMResponse{
		Content:   m.response,
		ToolCalls: []providers.ToolCall{},
	}, nil
}

func (m *simpleMockProvider) GetDefaultModel() string {
	return "mock-model"
}

// mockCustomTool is a simple mock tool for registration testing
type mockCustomTool struct{}

func (m *mockCustomTool) Name() string {
	return "mock_custom"
}

func (m *mockCustomTool) Description() string {
	return "Mock custom tool for testing"
}

func (m *mockCustomTool) Parameters() map[string]any {
	return map[string]any{
		"type":       "object",
		"properties": map[string]any{},
	}
}

func (m *mockCustomTool) Execute(ctx context.Context, args map[string]any) *tools.ToolResult {
	return tools.SilentResult("Custom tool executed")
}

// mockContextualTool tracks context updates
type mockContextualTool struct {
	lastChannel string
	lastChatID  string
}

func (m *mockContextualTool) Name() string {
	return "mock_contextual"
}

func (m *mockContextualTool) Description() string {
	return "Mock contextual tool"
}

func (m *mockContextualTool) Parameters() map[string]any {
	return map[string]any{
		"type":       "object",
		"properties": map[string]any{},
	}
}

func (m *mockContextualTool) Execute(ctx context.Context, args map[string]any) *tools.ToolResult {
	return tools.SilentResult("Contextual tool executed")
}

func (m *mockContextualTool) SetContext(channel, chatID string) {
	m.lastChannel = channel
	m.lastChatID = chatID
}

// testHelper executes a message and returns the response
type testHelper struct {
	al *AgentLoop
}

func (h testHelper) executeAndGetResponse(tb testing.TB, ctx context.Context, msg bus.InboundMessage) string {
	// Use a short timeout to avoid hanging
	timeoutCtx, cancel := context.WithTimeout(ctx, responseTimeout)
	defer cancel()

	response, err := h.al.processMessage(timeoutCtx, msg)
	if err != nil {
		tb.Fatalf("processMessage failed: %v", err)
	}
	return response
}

const responseTimeout = 3 * time.Second

// TestToolResult_SilentToolDoesNotSendUserMessage verifies silent tools don't trigger outbound
func TestToolResult_SilentToolDoesNotSendUserMessage(t *testing.T) {
	tmpDir, err := os.MkdirTemp("", "agent-test-*")
	if err != nil {
		t.Fatalf("Failed to create temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)

	cfg := &config.Config{
		Agents: config.AgentsConfig{
			Defaults: config.AgentDefaults{
				Workspace:         tmpDir,
				Model:             "test-model",
				MaxTokens:         4096,
				MaxToolIterations: 10,
			},
		},
	}

	msgBus := bus.NewMessageBus()
	provider := &simpleMockProvider{response: "File operation complete"}
	al := NewAgentLoop(cfg, msgBus, provider)
	helper := testHelper{al: al}

	// ReadFileTool returns SilentResult, which should not send user message
	ctx := context.Background()
	msg := bus.InboundMessage{
		Channel:    "test",
		SenderID:   "user1",
		ChatID:     "chat1",
		Content:    "read test.txt",
		SessionKey: "test-session",
	}

	response := helper.executeAndGetResponse(t, ctx, msg)

	// Silent tool should return the LLM's response directly
	if response != "File operation complete" {
		t.Errorf("Expected 'File operation complete', got: %s", response)
	}
}

// TestToolResult_UserFacingToolDoesSendMessage verifies user-facing tools trigger outbound
func TestToolResult_UserFacingToolDoesSendMessage(t *testing.T) {
	tmpDir, err := os.MkdirTemp("", "agent-test-*")
	if err != nil {
		t.Fatalf("Failed to create temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)

	cfg := &config.Config{
		Agents: config.AgentsConfig{
			Defaults: config.AgentDefaults{
				Workspace:         tmpDir,
				Model:             "test-model",
				MaxTokens:         4096,
				MaxToolIterations: 10,
			},
		},
	}

	msgBus := bus.NewMessageBus()
	provider := &simpleMockProvider{response: "Command output: hello world"}
	al := NewAgentLoop(cfg, msgBus, provider)
	helper := testHelper{al: al}

	// ExecTool returns UserResult, which should send user message
	ctx := context.Background()
	msg := bus.InboundMessage{
		Channel:    "test",
		SenderID:   "user1",
		ChatID:     "chat1",
		Content:    "run hello",
		SessionKey: "test-session",
	}

	response := helper.executeAndGetResponse(t, ctx, msg)

	// User-facing tool should include the output in final response
	if response != "Command output: hello world" {
		t.Errorf("Expected 'Command output: hello world', got: %s", response)
	}
}

// failFirstMockProvider fails on the first N calls with a specific error
type failFirstMockProvider struct {
	failures    int
	currentCall int
	failError   error
	successResp string
}

func (m *failFirstMockProvider) Chat(
	ctx context.Context,
	messages []providers.Message,
	tools []providers.ToolDefinition,
	model string,
	opts map[string]any,
) (*providers.LLMResponse, error) {
	m.currentCall++
	if m.currentCall <= m.failures {
		return nil, m.failError
	}
	return &providers.LLMResponse{
		Content:   m.successResp,
		ToolCalls: []providers.ToolCall{},
	}, nil
}

func (m *failFirstMockProvider) GetDefaultModel() string {
	return "mock-fail-model"
}

// TestAgentLoop_ContextExhaustionRetry verify that the agent retries on context errors
func TestAgentLoop_ContextExhaustionRetry(t *testing.T) {
	tmpDir, err := os.MkdirTemp("", "agent-test-*")
	if err != nil {
		t.Fatalf("Failed to create temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)

	cfg := &config.Config{
		Agents: config.AgentsConfig{
			Defaults: config.AgentDefaults{
				Workspace:         tmpDir,
				Model:             "test-model",
				MaxTokens:         4096,
				MaxToolIterations: 10,
			},
		},
	}

	msgBus := bus.NewMessageBus()

	// Create a provider that fails once with a context error
	contextErr := fmt.Errorf("InvalidParameter: Total tokens of image and text exceed max message tokens")
	provider := &failFirstMockProvider{
		failures:    1,
		failError:   contextErr,
		successResp: "Recovered from context error",
	}

	al := NewAgentLoop(cfg, msgBus, provider)

	// Inject some history to simulate a full context
	sessionKey := "test-session-context"
	// Create dummy history
	history := []providers.Message{
		{Role: "system", Content: "System prompt"},
		{Role: "user", Content: "Old message 1"},
		{Role: "assistant", Content: "Old response 1"},
		{Role: "user", Content: "Old message 2"},
		{Role: "assistant", Content: "Old response 2"},
		{Role: "user", Content: "Trigger message"},
	}
	defaultAgent := al.registry.GetDefaultAgent()
	if defaultAgent == nil {
		t.Fatal("No default agent found")
	}
	defaultAgent.Sessions.SetHistory(sessionKey, history)

	// Call ProcessDirectWithChannel
	// Note: ProcessDirectWithChannel calls processMessage which will execute runLLMIteration
	response, err := al.ProcessDirectWithChannel(
		context.Background(),
		"Trigger message",
		sessionKey,
		"test",
		"test-chat",
	)
	if err != nil {
		t.Fatalf("Expected success after retry, got error: %v", err)
	}

	if response != "Recovered from context error" {
		t.Errorf("Expected 'Recovered from context error', got '%s'", response)
	}

	// We expect 2 calls: 1st failed, 2nd succeeded
	if provider.currentCall != 2 {
		t.Errorf("Expected 2 calls (1 fail + 1 success), got %d", provider.currentCall)
	}

	// Check final history length
	finalHistory := defaultAgent.Sessions.GetHistory(sessionKey)
	// We verify that the history has been modified (compressed)
	// Original length: 6
	// Expected behavior: compression drops ~50% of history (mid slice)
	// We can assert that the length is NOT what it would be without compression.
	// Without compression: 6 + 1 (new user msg) + 1 (assistant msg) = 8
	if len(finalHistory) >= 8 {
		t.Errorf("Expected history to be compressed (len < 8), got %d", len(finalHistory))
	}
}

func TestTargetReasoningChannelID_AllChannels(t *testing.T) {
	tmpDir, err := os.MkdirTemp("", "agent-test-*")
	if err != nil {
		t.Fatalf("Failed to create temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)

	cfg := &config.Config{
		Agents: config.AgentsConfig{
			Defaults: config.AgentDefaults{
				Workspace:         tmpDir,
				Model:             "test-model",
				MaxTokens:         4096,
				MaxToolIterations: 10,
			},
		},
	}

	al := NewAgentLoop(cfg, bus.NewMessageBus(), &mockProvider{})
	chManager, err := channels.NewManager(&config.Config{}, bus.NewMessageBus(), nil)
	if err != nil {
		t.Fatalf("Failed to create channel manager: %v", err)
	}
	for name, id := range map[string]string{
		"whatsapp":  "rid-whatsapp",
		"telegram":  "rid-telegram",
		"feishu":    "rid-feishu",
		"discord":   "rid-discord",
		"maixcam":   "rid-maixcam",
		"qq":        "rid-qq",
		"dingtalk":  "rid-dingtalk",
		"slack":     "rid-slack",
		"line":      "rid-line",
		"onebot":    "rid-onebot",
		"wecom":     "rid-wecom",
		"wecom_app": "rid-wecom-app",
	} {
		chManager.RegisterChannel(name, &fakeChannel{id: id})
	}
	al.SetChannelManager(chManager)
	tests := []struct {
		channel string
		wantID  string
	}{
		{channel: "whatsapp", wantID: "rid-whatsapp"},
		{channel: "telegram", wantID: "rid-telegram"},
		{channel: "feishu", wantID: "rid-feishu"},
		{channel: "discord", wantID: "rid-discord"},
		{channel: "maixcam", wantID: "rid-maixcam"},
		{channel: "qq", wantID: "rid-qq"},
		{channel: "dingtalk", wantID: "rid-dingtalk"},
		{channel: "slack", wantID: "rid-slack"},
		{channel: "line", wantID: "rid-line"},
		{channel: "onebot", wantID: "rid-onebot"},
		{channel: "wecom", wantID: "rid-wecom"},
		{channel: "wecom_app", wantID: "rid-wecom-app"},
		{channel: "unknown", wantID: ""},
	}

	for _, tt := range tests {
		t.Run(tt.channel, func(t *testing.T) {
			got := al.targetReasoningChannelID(tt.channel)
			if got != tt.wantID {
				t.Fatalf("targetReasoningChannelID(%q) = %q, want %q", tt.channel, got, tt.wantID)
			}
		})
	}
}

func TestHandleReasoning(t *testing.T) {
	newLoop := func(t *testing.T) (*AgentLoop, *bus.MessageBus) {
		t.Helper()
		tmpDir, err := os.MkdirTemp("", "agent-test-*")
		if err != nil {
			t.Fatalf("Failed to create temp dir: %v", err)
		}
		t.Cleanup(func() { _ = os.RemoveAll(tmpDir) })
		cfg := &config.Config{
			Agents: config.AgentsConfig{
				Defaults: config.AgentDefaults{
					Workspace:         tmpDir,
					Model:             "test-model",
					MaxTokens:         4096,
					MaxToolIterations: 10,
				},
			},
		}
		msgBus := bus.NewMessageBus()
		return NewAgentLoop(cfg, msgBus, &mockProvider{}), msgBus
	}

	t.Run("skips when any required field is empty", func(t *testing.T) {
		al, msgBus := newLoop(t)
		al.handleReasoning(context.Background(), "reasoning", "telegram", "")

		ctx, cancel := context.WithTimeout(context.Background(), 20*time.Millisecond)
		defer cancel()
		if msg, ok := msgBus.SubscribeOutbound(ctx); ok {
			t.Fatalf("expected no outbound message, got %+v", msg)
		}
	})

	t.Run("publishes one message for non telegram", func(t *testing.T) {
		al, msgBus := newLoop(t)
		al.handleReasoning(context.Background(), "hello reasoning", "slack", "channel-1")

		ctx, cancel := context.WithTimeout(context.Background(), 200*time.Millisecond)
		defer cancel()
		msg, ok := msgBus.SubscribeOutbound(ctx)
		if !ok {
			t.Fatal("expected an outbound message")
		}
		if msg.Channel != "slack" || msg.ChatID != "channel-1" || msg.Content != "hello reasoning" {
			t.Fatalf("unexpected outbound message: %+v", msg)
		}
	})

	t.Run("publishes one message for telegram", func(t *testing.T) {
		al, msgBus := newLoop(t)
		reasoning := "hello telegram reasoning"
		al.handleReasoning(context.Background(), reasoning, "telegram", "tg-chat")

		ctx, cancel := context.WithTimeout(context.Background(), 200*time.Millisecond)
		defer cancel()
		msg, ok := msgBus.SubscribeOutbound(ctx)
		if !ok {
			t.Fatal("expected outbound message")
		}

		if msg.Channel != "telegram" {
			t.Fatalf("expected telegram channel message, got %+v", msg)
		}
		if msg.ChatID != "tg-chat" {
			t.Fatalf("expected chatID tg-chat, got %+v", msg)
		}
		if msg.Content != reasoning {
			t.Fatalf("content mismatch: got %q want %q", msg.Content, reasoning)
		}
	})
	t.Run("expired ctx", func(t *testing.T) {
		al, msgBus := newLoop(t)
		reasoning := "hello telegram reasoning"
		ctx, cancel := context.WithCancel(context.Background())
		cancel()
		al.handleReasoning(ctx, reasoning, "telegram", "tg-chat")

		ctx, cancel = context.WithTimeout(context.Background(), 200*time.Millisecond)
		defer cancel()
		msg, ok := msgBus.SubscribeOutbound(ctx)
		if ok {
			t.Fatalf("expected no outbound message, got %+v", msg)
		}
	})

	t.Run("returns promptly when bus is full", func(t *testing.T) {
		al, msgBus := newLoop(t)

		// Fill the outbound bus buffer until a publish would block.
		// Use a short timeout to detect when the buffer is full,
		// rather than hardcoding the buffer size.
		for i := 0; ; i++ {
			fillCtx, fillCancel := context.WithTimeout(context.Background(), 50*time.Millisecond)
			err := msgBus.PublishOutbound(fillCtx, bus.OutboundMessage{
				Channel: "filler",
				ChatID:  "filler",
				Content: fmt.Sprintf("filler-%d", i),
			})
			fillCancel()
			if err != nil {
				// Buffer is full (timed out trying to send).
				break
			}
		}

		// Use a short-deadline parent context to bound the test.
		ctx, cancel := context.WithTimeout(context.Background(), 500*time.Millisecond)
		defer cancel()

		start := time.Now()
		al.handleReasoning(ctx, "should timeout", "slack", "channel-full")
		elapsed := time.Since(start)

		// handleReasoning uses a 5s internal timeout, but the parent ctx
		// expires in 500ms. It should return within ~500ms, not 5s.
		if elapsed > 2*time.Second {
			t.Fatalf("handleReasoning blocked too long (%v); expected prompt return", elapsed)
		}

		// Drain the bus and verify the reasoning message was NOT published
		// (it should have been dropped due to timeout).
		drainCtx, drainCancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
		defer drainCancel()
		foundReasoning := false
		for {
			msg, ok := msgBus.SubscribeOutbound(drainCtx)
			if !ok {
				break
			}
			if msg.Content == "should timeout" {
				foundReasoning = true
			}
		}
		if foundReasoning {
			t.Fatal("expected reasoning message to be dropped when bus is full, but it was published")
		}
	})
}