//go:build regression

// Package e2e contains smoke and regression tests for cc-connect.
// Regression tests cover critical functionality paths and should be run
// before each release.
package e2e

import (
	"context"
	"io"
	"os"
	"strings"
	"sync"
	"testing"
	"time"

	"github.com/chenhg5/cc-connect/core"
	"github.com/chenhg5/cc-connect/tests/mocks"
	"github.com/chenhg5/cc-connect/tests/mocks/fake"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/mock"
	"github.com/stretchr/testify/require"
)

// ---------------------------------------------------------------------------
// R-200: Full Message Pipeline
// ---------------------------------------------------------------------------

func TestRegression_FullMessagePipeline(t *testing.T) {
	ctx := context.Background()

	// Create a chain: Platform → Handler → Agent → Response → Platform
	mockPlatform := new(mocks.MockPlatform)
	mockPlatform.On("Name").Return("test-platform")
	mockPlatform.On("Start", mock.Anything).Return(nil)
	mockPlatform.On("Reply", ctx, mock.Anything, mock.Anything).Return(nil)
	mockPlatform.On("Stop").Return(nil)

	// Create agent session with a realistic response
	events := []core.Event{
		{Type: core.EventThinking, Content: "Processing your request..."},
		{Type: core.EventText, Content: "I've analyzed your code and found an issue."},
		{Type: core.EventToolUse, ToolName: "Bash", ToolInput: "ls -la"},
		{Type: core.EventToolResult, ToolResult: "total 8\ndrwxr-xr-x 20 user user 4096 Mar 19 10:00 .\n"},
		{Type: core.EventText, Content: "The issue is in line 42."},
		{Type: core.EventResult, Content: "Analysis complete. The issue is in line 42.", Done: true},
	}
	mockSession := mocks.NewMockAgentSessionWithEvents("session-pipeline", events)

	mockAgent := new(mocks.MockAgent)
	mockAgent.On("StartSession", ctx, "session-pipeline").Return(mockSession, nil)

	// Create message handler that simulates the full pipeline
	handler := fake.NewTestMessageHandler()

	err := mockPlatform.Start(handler.Handle)
	require.NoError(t, err)

	// Simulate incoming message
	incoming := fake.TestMessageWithContent("Analyze my code")
	handler.Handle(mockPlatform, incoming)

	// Verify message was received
	messages := handler.GetMessages()
	require.Len(t, messages, 1)

	// Start agent session and process
	session, err := mockAgent.StartSession(ctx, "session-pipeline")
	require.NoError(t, err)

	err = session.Send("Analyze my code", nil, nil)
	require.NoError(t, err)

	// Collect all events
	var collectedEvents []core.Event
	for e := range session.Events() {
		collectedEvents = append(collectedEvents, e)
		if e.Done {
			break
		}
	}

	// Verify event flow
	assert.GreaterOrEqual(t, len(collectedEvents), 6, "should have multiple events")
	assert.Equal(t, core.EventType("thinking"), collectedEvents[0].Type)
	assert.Equal(t, core.EventType("text"), collectedEvents[1].Type)
	assert.Equal(t, core.EventType("tool_use"), collectedEvents[2].Type)
	assert.Equal(t, core.EventType("tool_result"), collectedEvents[3].Type)

	mockAgent.AssertExpectations(t)

	t.Log("Full message pipeline: PASS")
}

// ---------------------------------------------------------------------------
// R-201: Concurrent Agents
// ---------------------------------------------------------------------------

func TestRegression_ConcurrentAgents(t *testing.T) {
	ctx := context.Background()

	// Create multiple agent sessions
	agents := []string{"agent-a", "agent-b", "agent-c"}
	var wg sync.WaitGroup

	// Track sessions
	sessions := make([]*mocks.MockAgentSession, len(agents))

	for i, agentName := range agents {
		wg.Add(1)
		go func(idx int, name string) {
			defer wg.Done()

			events := []core.Event{
				{Type: core.EventText, Content: "Response from " + name},
				{Type: core.EventResult, Content: name + " done", Done: true},
			}
			sessions[idx] = mocks.NewMockAgentSessionWithEvents(name+"-session", events)

			mockAgent := new(mocks.MockAgent)
			mockAgent.On("StartSession", ctx, name+"-session").Return(sessions[idx], nil)

			session, err := mockAgent.StartSession(ctx, name+"-session")
			assert.NoError(t, err)

			err = session.Send("Message to "+name, nil, nil)
			assert.NoError(t, err)

			// Collect events
			count := 0
			for e := range session.Events() {
				count++
				if e.Done {
					break
				}
			}
			assert.GreaterOrEqual(t, count, 2)

			mockAgent.AssertExpectations(t)
		}(i, agentName)
	}

	wg.Wait()

	// Verify all sessions were used
	for i, s := range sessions {
		assert.NotNil(t, s, "session %d should be created", i)
	}

	t.Log("Concurrent agents: PASS")
}

// ---------------------------------------------------------------------------
// R-202: Agent Timeout and Interrupt
// ---------------------------------------------------------------------------

func TestRegression_AgentTimeout(t *testing.T) {
	ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
	defer cancel()

	// Create a slow fake agent session
	session := fake.NewFakeAgentSession("slow-session")
	session.SetResponseDelay(500 * time.Millisecond) // Slower than context timeout
	session.AddTextEvent("Still processing...").AddResultEvent("Finally done")

	mockAgent := new(mocks.MockAgent)
	mockAgent.On("StartSession", ctx, "slow-session").Return(session, nil)

	// Start session
	started, err := mockAgent.StartSession(ctx, "slow-session")
	require.NoError(t, err)

	// Send message - should eventually timeout
	err = started.Send("Slow request", nil, nil)
	// The error might be nil because we don't actually wait for response in Send

	// Try to collect events
	select {
	case <-started.Events():
		// Events came through
	case <-ctx.Done():
		// Context timed out as expected
	}

	// Session should not be alive after close
	err = started.Close()
	require.NoError(t, err)
	assert.False(t, started.Alive())

	mockAgent.AssertExpectations(t)

	t.Log("Agent timeout and interrupt: PASS")
}

func TestRegression_AgentGracefulShutdown(t *testing.T) {
	ctx := context.Background()

	// Create agent session
	session := fake.NewFakeAgentSession("shutdown-test")
	session.AddTextEvent("Working...").AddResultEvent("Done")

	mockAgent := new(mocks.MockAgent)
	mockAgent.On("StartSession", ctx, "shutdown-test").Return(session, nil)
	mockAgent.On("Stop").Return(nil)

	// Start session
	started, err := mockAgent.StartSession(ctx, "shutdown-test")
	require.NoError(t, err)
	assert.True(t, started.Alive())

	// Close session gracefully
	err = started.Close()
	require.NoError(t, err)
	assert.False(t, started.Alive())

	// Stop agent
	err = mockAgent.Stop()
	require.NoError(t, err)

	mockAgent.AssertExpectations(t)

	t.Log("Agent graceful shutdown: PASS")
}

// ---------------------------------------------------------------------------
// R-210: YOLO Mode (auto-approve)
// ---------------------------------------------------------------------------

func TestRegression_PermissionYOLO(t *testing.T) {
	// Create role manager with YOLO mode
	manager := core.NewUserRoleManager()

	manager.Configure("yolo", []core.RoleInput{
		{
			Name:    "yolo",
			UserIDs: []string{"user-yolo"},
			RateLimit: &core.RateLimitCfg{
				MaxMessages: 0, // unlimited
			},
		},
	})

	// Verify YOLO user gets correct role
	role := manager.ResolveRole("user-yolo")
	require.NotNil(t, role)
	assert.Equal(t, "yolo", role.Name)

	t.Log("Permission YOLO mode: PASS")
}

// ---------------------------------------------------------------------------
// R-211: Default Mode (require approval)
// ---------------------------------------------------------------------------

func TestRegression_PermissionDefault(t *testing.T) {
	manager := core.NewUserRoleManager()

	manager.Configure("member", []core.RoleInput{
		{
			Name:             "admin",
			UserIDs:          []string{"admin-user"},
			DisabledCommands: []string{"rm", "delete"},
		},
		{
			Name:             "member",
			UserIDs:          []string{"regular-user", "*"},
			DisabledCommands: []string{},
		},
	})

	// Admin user
	adminRole := manager.ResolveRole("admin-user")
	require.NotNil(t, adminRole)
	assert.Equal(t, "admin", adminRole.Name)

	// Regular user
	memberRole := manager.ResolveRole("regular-user")
	require.NotNil(t, memberRole)
	assert.Equal(t, "member", memberRole.Name)

	// Unknown user gets default (wildcard) role
	wildcardRole := manager.ResolveRole("unknown-user")
	require.NotNil(t, wildcardRole)
	assert.Equal(t, "member", wildcardRole.Name)

	t.Log("Permission default mode: PASS")
}

// ---------------------------------------------------------------------------
// R-212: Secret Redaction
// ---------------------------------------------------------------------------

func TestRegression_SecretRedaction(t *testing.T) {
	tests := []struct {
		name     string
		input    []string
		expected []string
	}{
		{
			name:     "api key flag",
			input:    []string{"--api-key", "secret123"},
			expected: []string{"--api-key", "***"},
		},
		{
			name:     "token flag",
			input:    []string{"--token", "my-token-xyz"},
			expected: []string{"--token", "***"},
		},
		{
			name:     "secret flag",
			input:    []string{"--secret", "password123"},
			expected: []string{"--secret", "***"},
		},
		{
			name:     "api_key with equals",
			input:    []string{"--api_key=sk-12345"},
			expected: []string{"--api_key=***"},
		},
		{
			name:     "no sensitive data",
			input:    []string{"ls", "-la", "README.md"},
			expected: []string{"ls", "-la", "README.md"},
		},
		{
			name:     "mixed content",
			input:    []string{"--model", "gpt-4", "--api-key", "sk-secret", "prompt"},
			expected: []string{"--model", "gpt-4", "--api-key", "***", "prompt"},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			result := core.RedactArgs(tt.input)
			assert.Equal(t, tt.expected, result)
		})
	}

	t.Log("Secret redaction: PASS")
}

func TestRegression_TokenRedaction(t *testing.T) {
	// Test RedactToken function - replaces ALL occurrences of the token
	text := "Your API key is sk-12345-abcdef and token is sk-12345-abcdef"
	redacted := core.RedactToken(text, "sk-12345-abcdef")
	assert.Contains(t, redacted, "[REDACTED]")
	assert.NotContains(t, redacted, "sk-12345-abcdef")

	// Empty token returns original
	assert.Equal(t, text, core.RedactToken(text, ""))

	// Token matching full text replaces entire text
	fullRedacted := core.RedactToken(text, text)
	assert.Equal(t, "[REDACTED]", fullRedacted)

	// Non-existent token returns original
	assert.Equal(t, text, core.RedactToken(text, "non-existent-token"))

	t.Log("Token redaction: PASS")
}

// ---------------------------------------------------------------------------
// R-213: Command Injection Prevention
// ---------------------------------------------------------------------------

func TestRegression_CommandInjection(t *testing.T) {
	// Test that AllowList prevents injection
	tests := []struct {
		name      string
		allowFrom string
		userID    string
		expected  bool
	}{
		{
			name:      "exact match",
			allowFrom: "user1,user2,user3",
			userID:    "user2",
			expected:  true,
		},
		{
			name:      "no match",
			allowFrom: "user1,user2",
			userID:    "user4",
			expected:  false,
		},
		{
			name:      "empty allow all",
			allowFrom: "",
			userID:    "anyone",
			expected:  true,
		},
		{
			name:      "wildcard all",
			allowFrom: "*",
			userID:    "hacker",
			expected:  true,
		},
		{
			name:      "case insensitive",
			allowFrom: "User1,USER2",
			userID:    "user2",
			expected:  true,
		},
		{
			name:      "whitespace trimmed",
			allowFrom: " user1 , user2 ",
			userID:    "user2",
			expected:  true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			result := core.AllowList(tt.allowFrom, tt.userID)
			assert.Equal(t, tt.expected, result)
		})
	}

	t.Log("Command injection prevention: PASS")
}

// ---------------------------------------------------------------------------
// R-214: Rate Limiting
// ---------------------------------------------------------------------------

func TestRegression_RateLimit(t *testing.T) {
	// Create rate limiter: 3 messages per second
	rl := core.NewRateLimiter(3, time.Second)
	defer rl.Stop()

	// First 3 should be allowed
	for i := 0; i < 3; i++ {
		allowed := rl.Allow("user-rate-test")
		assert.True(t, allowed, "request %d should be allowed", i+1)
	}

	// 4th should be blocked
	allowed := rl.Allow("user-rate-test")
	assert.False(t, allowed, "4th request should be blocked")

	// Different user should not be affected
	allowed = rl.Allow("other-user")
	assert.True(t, allowed, "different user should still be allowed")

	t.Log("Rate limiting: PASS")
}

func TestRegression_RateLimitMultipleUsers(t *testing.T) {
	rl := core.NewRateLimiter(2, time.Second)
	defer rl.Stop()

	users := []string{"alice", "bob", "charlie"}

	// Each user gets 2 requests
	for _, user := range users {
		for i := 0; i < 2; i++ {
			allowed := rl.Allow(user)
			assert.True(t, allowed, "%s request %d should be allowed", user, i+1)
		}
		// 3rd request blocked
		allowed := rl.Allow(user)
		assert.False(t, allowed, "%s 3rd request should be blocked", user)
	}

	t.Log("Rate limiting (multiple users): PASS")
}

// ---------------------------------------------------------------------------
// R-220: Streaming Response
// ---------------------------------------------------------------------------

func TestRegression_StreamingResponse(t *testing.T) {
	ctx := context.Background()

	// Create session with multiple streaming events
	session := fake.NewFakeAgentSession("stream-test")

	// Simulate streaming: multiple text events followed by result
	session.AddThinkingEvent("Thinking...")
	session.AddTextEvent("Here's step 1...")
	session.AddTextEvent("Here's step 2...")
	session.AddTextEvent("Here's step 3...")
	session.AddResultEvent("Final answer.")

	mockAgent := new(mocks.MockAgent)
	mockAgent.On("StartSession", ctx, "stream-test").Return(session, nil)

	started, err := mockAgent.StartSession(ctx, "stream-test")
	require.NoError(t, err)

	err = started.Send("Stream response", nil, nil)
	require.NoError(t, err)

	// Collect streaming events
	var events []core.Event
	for e := range started.Events() {
		events = append(events, e)
		if e.Done {
			break
		}
	}

	// Should have multiple text events (streaming)
	assert.GreaterOrEqual(t, len(events), 4, "should have streaming events")

	// First should be thinking
	assert.Equal(t, core.EventType("thinking"), events[0].Type)

	// Last should be result with Done=true
	lastEvent := events[len(events)-1]
	assert.Equal(t, core.EventType("result"), lastEvent.Type)
	assert.True(t, lastEvent.Done)

	mockAgent.AssertExpectations(t)

	t.Log("Streaming response: PASS")
}

// ---------------------------------------------------------------------------
// R-230: Session Create/Switch/Delete/List
// ---------------------------------------------------------------------------

func TestRegression_SessionCRUD(t *testing.T) {
	ctx := context.Background()

	// Create agent
	agent := fake.NewFakeAgent("test-agent")

	// Start session 1
	s1, err := agent.StartSession(ctx, "session-1")
	require.NoError(t, err)
	assert.Equal(t, "session-1", s1.CurrentSessionID())
	assert.True(t, s1.Alive())

	// List sessions
	sessions, err := agent.ListSessions(ctx)
	require.NoError(t, err)
	assert.NotEmpty(t, sessions)

	// Start session 2
	s2, err := agent.StartSession(ctx, "session-2")
	require.NoError(t, err)
	assert.Equal(t, "session-2", s2.CurrentSessionID())

	// Session 1 should still be alive
	assert.True(t, s1.Alive(), "session 1 should still be alive")

	// Close session 1
	err = s1.Close()
	require.NoError(t, err)
	assert.False(t, s1.Alive(), "session 1 should be closed")

	// Session 2 should still work
	assert.True(t, s2.Alive())

	// Start session 3
	s3, err := agent.StartSession(ctx, "session-3")
	require.NoError(t, err)
	assert.Equal(t, "session-3", s3.CurrentSessionID())

	t.Log("Session CRUD: PASS")
}

func TestRegression_SessionHistory(t *testing.T) {
	ctx := context.Background()

	// Create agent with session history support
	mockAgent := new(mocks.MockAgent)

	history := []core.HistoryEntry{
		{Role: "user", Content: "Hello"},
		{Role: "assistant", Content: "Hi there!"},
		{Role: "user", Content: "Help me"},
		{Role: "assistant", Content: "What do you need?"},
	}

	mockAgent.On("GetSessionHistory", ctx, "session-history", 50).Return(history, nil)
	mockAgent.On("Stop").Return(nil)

	// This would be called through HistoryProvider interface
	// For this test, we just verify the mock works

	t.Log("Session history: PASS")
}

// ---------------------------------------------------------------------------
// R-240: Feishu Card Rendering
// ---------------------------------------------------------------------------

func TestRegression_FeishuCardRender(t *testing.T) {
	// Create a card using the builder
	card := core.NewCard().
		Title("Test Card", "blue").
		Markdown("This is **bold** and *italic* text.").
		Markdown("List items:\n- Item 1\n- Item 2").
		Divider().
		Buttons(
			core.PrimaryBtn("Approve", "cmd:/approve"),
			core.DefaultBtn("Reject", "cmd:/reject"),
		).
		Build()

	assert.NotNil(t, card)
	assert.NotNil(t, card.Header)
	assert.Equal(t, "Test Card", card.Header.Title)
	assert.Equal(t, "blue", card.Header.Color)
	assert.NotEmpty(t, card.Elements)

	// Test text fallback rendering
	text := card.RenderText()
	assert.Contains(t, text, "Test Card")
	assert.Contains(t, text, "bold")
	assert.Contains(t, text, "Approve")
	assert.Contains(t, text, "Reject")

	// Test button collection
	buttons := card.CollectButtons()
	assert.NotEmpty(t, buttons)

	t.Log("Feishu card render: PASS")
}

func TestRegression_CardButtons(t *testing.T) {
	card := core.NewCard().
		Title("Interactive Card", "green").
		Markdown("Choose an action:").
		Buttons(
			core.PrimaryBtn("Start", "act:/start"),
			core.DefaultBtn("Settings", "act:/settings"),
			core.DangerBtn("Stop", "act:/stop"),
		).
		Build()

	rows := card.CollectButtons()
	assert.Len(t, rows, 1)    // One row of buttons
	assert.Len(t, rows[0], 3) // Three buttons

	// Verify button values
	assert.Equal(t, "act:/start", rows[0][0].Data)
	assert.Equal(t, "act:/settings", rows[0][1].Data)
	assert.Equal(t, "act:/stop", rows[0][2].Data)

	// Verify HasButtons
	assert.True(t, card.HasButtons())

	t.Log("Card buttons: PASS")
}

// ---------------------------------------------------------------------------
// R-250: Cron Expression Parsing
// ---------------------------------------------------------------------------

func TestRegression_CronParse(t *testing.T) {
	// Test cron expression parsing via cron store
	store, err := core.NewCronStore(t.TempDir())
	require.NoError(t, err)

	// Add a cron job
	job := &core.CronJob{
		ID:          "test-cron-1",
		Description: "Test cron",
		Prompt:      "Run daily",
		CronExpr:    "0 9 * * *",
		Enabled:     true,
	}

	err = store.Add(job)
	require.NoError(t, err)

	// Verify it was added
	jobs := store.List()
	assert.Len(t, jobs, 1)
	assert.Equal(t, "test-cron-1", jobs[0].ID)

	// Remove job
	removed := store.Remove("test-cron-1")
	assert.True(t, removed)

	jobs = store.List()
	assert.Empty(t, jobs)

	t.Log("Cron expression parsing: PASS")
}

func TestRegression_CronJobLifecycle(t *testing.T) {
	store, err := core.NewCronStore(t.TempDir())
	require.NoError(t, err)

	// Add multiple jobs
	jobs := []*core.CronJob{
		{ID: "cron-1", Description: "Job 1", CronExpr: "0 9 * * *", Enabled: true},
		{ID: "cron-2", Description: "Job 2", CronExpr: "0 10 * * *", Enabled: false},
		{ID: "cron-3", Description: "Job 3", CronExpr: "0 11 * * *", Enabled: true},
	}

	for _, job := range jobs {
		err := store.Add(job)
		require.NoError(t, err)
	}

	// List all
	all := store.List()
	assert.Len(t, all, 3)

	// Enable/Disable
	store.SetEnabled("cron-2", true)
	job2 := store.Get("cron-2")
	assert.NotNil(t, job2)

	// Toggle mute: SetMute(true) sets mute=true, then ToggleMute flips to false
	store.SetMute("cron-1", true)
	muted, ok := store.ToggleMute("cron-1")
	assert.True(t, ok)
	assert.False(t, muted) // toggled from true to false

	// Mark run
	store.MarkRun("cron-1", nil)

	// Remove all
	store.Remove("cron-1")
	store.Remove("cron-2")
	store.Remove("cron-3")

	all = store.List()
	assert.Empty(t, all)

	t.Log("Cron job lifecycle: PASS")
}

// ---------------------------------------------------------------------------
// R-260: Config Hot Reload
// ---------------------------------------------------------------------------

func TestRegression_ConfigReload(t *testing.T) {
	// Create role manager
	manager := core.NewUserRoleManager()

	// Initial config
	manager.Configure("member", []core.RoleInput{
		{Name: "member", UserIDs: []string{"user1"}},
	})

	role := manager.ResolveRole("user1")
	assert.Equal(t, "member", role.Name)

	// Simulate reload with new config
	manager.Configure("admin", []core.RoleInput{
		{Name: "admin", UserIDs: []string{"user1", "user2"}},
		{Name: "member", UserIDs: []string{"user3"}},
	})

	// Old user still resolved (to different role now)
	role = manager.ResolveRole("user1")
	assert.Equal(t, "admin", role.Name)

	// New user
	role = manager.ResolveRole("user2")
	assert.Equal(t, "admin", role.Name)

	// User from default role
	role = manager.ResolveRole("user3")
	assert.Equal(t, "member", role.Name)

	t.Log("Config hot reload: PASS")
}

// ---------------------------------------------------------------------------
// R-261: Atomic Write
// ---------------------------------------------------------------------------

func TestRegression_AtomicWrite(t *testing.T) {
	tmpDir := t.TempDir()
	filePath := tmpDir + "/atomic-test.txt"

	// Test atomic write
	content := "Test content for atomic write"
	err := core.AtomicWriteFile(filePath, []byte(content), 0644)
	require.NoError(t, err)

	// Verify content was written correctly
	data, err := os.ReadFile(filePath)
	require.NoError(t, err)
	assert.Equal(t, content, string(data))

	t.Log("Atomic write: PASS")
}

// ---------------------------------------------------------------------------
// R-262: Message Deduplication
// ---------------------------------------------------------------------------

func TestRegression_Deduplication(t *testing.T) {
	dedup := &core.MessageDedup{}

	// First message should not be duplicate
	isDup := dedup.IsDuplicate("msg-001")
	assert.False(t, isDup)

	// Second message should not be duplicate
	isDup = dedup.IsDuplicate("msg-002")
	assert.False(t, isDup)

	// Repeated message should be duplicate
	isDup = dedup.IsDuplicate("msg-001")
	assert.True(t, isDup)

	// Empty message ID is never duplicate
	isDup = dedup.IsDuplicate("")
	assert.False(t, isDup)

	t.Log("Message deduplication: PASS")
}

func TestRegression_DeduplicationTTL(t *testing.T) {
	dedup := &core.MessageDedup{}

	// Add message
	isDup := dedup.IsDuplicate("msg-ttl")
	assert.False(t, isDup)

	// Immediately after should be duplicate
	isDup = dedup.IsDuplicate("msg-ttl")
	assert.True(t, isDup)

	t.Log("Message deduplication TTL: PASS")
}

// ---------------------------------------------------------------------------
// T-221: 错误消息格式化测试
// ---------------------------------------------------------------------------

func TestRegression_ErrorFormatting(t *testing.T) {
	// Test error event formatting
	errEvent := core.Event{
		Type:    core.EventError,
		Content: "operation failed",
		Error:   context.DeadlineExceeded,
		Done:    true,
	}

	assert.Equal(t, core.EventError, errEvent.Type)
	assert.Equal(t, "operation failed", errEvent.Content)
	assert.Equal(t, context.DeadlineExceeded, errEvent.Error)
	assert.True(t, errEvent.Done)

	// Test error with different error types
	errTests := []struct {
		name    string
		err     error
		wantErr bool
	}{
		{"DeadlineExceeded", context.DeadlineExceeded, true},
		{"Canceled", context.Canceled, true},
		{"EOF", io.EOF, true},
		{"Nil error", nil, false},
	}

	for _, tt := range errTests {
		t.Run(tt.name, func(t *testing.T) {
			e := core.Event{
				Type:  core.EventError,
				Error: tt.err,
				Done:  true,
			}
			if tt.wantErr {
				assert.Error(t, e.Error)
			} else {
				assert.Nil(t, e.Error)
			}
		})
	}

	t.Log("Error formatting: PASS")
}

// ---------------------------------------------------------------------------
// T-234: Session 持久化测试
// ---------------------------------------------------------------------------

func TestRegression_SessionPersistence(t *testing.T) {
	ctx := context.Background()
	agent := fake.NewFakeAgent("persist-agent")

	// Start first session
	sess1, err := agent.StartSession(ctx, "persist-session-1")
	require.NoError(t, err)
	require.NotNil(t, sess1)

	// Send some messages
	err = sess1.Send("Message 1", nil, nil)
	require.NoError(t, err)
	err = sess1.Send("Message 2", nil, nil)
	require.NoError(t, err)

	// Verify prompts were recorded
	session1 := agent.GetSession()
	prompts1 := session1.GetPrompts()
	assert.Len(t, prompts1, 2)
	assert.Contains(t, prompts1[0], "Message 1")
	assert.Contains(t, prompts1[1], "Message 2")

	// Close session
	err = sess1.Close()
	require.NoError(t, err)
	assert.False(t, sess1.Alive())

	// Simulate restore: start new session with a different ID
	sess2, err := agent.StartSession(ctx, "persist-session-2")
	require.NoError(t, err)
	require.NotNil(t, sess2)

	// Session IDs should be different
	assert.Equal(t, "persist-session-1", sess1.CurrentSessionID())
	assert.Equal(t, "persist-session-2", sess2.CurrentSessionID())
	assert.NotEqual(t, sess1.CurrentSessionID(), sess2.CurrentSessionID())
	assert.True(t, sess2.Alive())

	// New session should have no prompts (fresh start)
	session2 := agent.GetSession()
	prompts2 := session2.GetPrompts()
	assert.Empty(t, prompts2, "new session should start fresh")

	// Old session should still be closed
	assert.False(t, sess1.Alive())

	t.Log("Session persistence: PASS")
}

// ---------------------------------------------------------------------------
// T-235: 多 Workspace 隔离测试
// ---------------------------------------------------------------------------

func TestRegression_WorkspaceIsolation(t *testing.T) {
	ctx := context.Background()

	// Create two independent agents simulating different workspaces
	agent1 := fake.NewFakeAgent("workspace-1-agent")
	agent2 := fake.NewFakeAgent("workspace-2-agent")

	// Start sessions on each
	sess1, err := agent1.StartSession(ctx, "ws1-session")
	require.NoError(t, err)

	sess2, err := agent2.StartSession(ctx, "ws2-session")
	require.NoError(t, err)

	// Sessions should be independent
	assert.NotEqual(t, sess1.CurrentSessionID(), sess2.CurrentSessionID())

	// Send messages to each
	err = sess1.Send("Message for workspace 1", nil, nil)
	require.NoError(t, err)

	err = sess2.Send("Message for workspace 2", nil, nil)
	require.NoError(t, err)

	// Each agent's session should only have its own messages
	prompts1 := agent1.GetSession().GetPrompts()
	prompts2 := agent2.GetSession().GetPrompts()

	assert.Len(t, prompts1, 1)
	assert.Contains(t, prompts1[0], "workspace 1")
	assert.Len(t, prompts2, 1)
	assert.Contains(t, prompts2[0], "workspace 2")

	// Close workspace 1 session - workspace 2 should be unaffected
	err = sess1.Close()
	require.NoError(t, err)

	assert.False(t, sess1.Alive())
	assert.True(t, sess2.Alive(), "workspace 2 session should still be alive")

	// Workspace 1 agent can start a new session
	sess1New, err := agent1.StartSession(ctx, "ws1-session-new")
	require.NoError(t, err)
	assert.True(t, sess1New.Alive())
	assert.NotEqual(t, sess1.CurrentSessionID(), sess1New.CurrentSessionID())

	t.Log("Workspace isolation: PASS")
}

// ---------------------------------------------------------------------------
// T-241: Discord Embed 格式测试
// ---------------------------------------------------------------------------

func TestRegression_DiscordEmbed(t *testing.T) {
	// Test Discord embed structure that would be generated by the platform
	type Embed struct {
		Title       string `json:"title"`
		Description string `json:"description"`
		Color       int    `json:"color"`
		Fields      []struct {
			Name   string `json:"name"`
			Value  string `json:"value"`
			Inline bool   `json:"inline"`
		} `json:"fields"`
		Footer struct {
			Text string `json:"text"`
		} `json:"footer"`
	}

	// Simulate embed generation
	embed := Embed{
		Title:       "Test Result",
		Description: "This is a test embed description",
		Color:       0x3498db, // blue
		Fields: []struct {
			Name   string `json:"name"`
			Value  string `json:"value"`
			Inline bool   `json:"inline"`
		}{
			{Name: "Status", Value: "Success", Inline: true},
			{Name: "Duration", Value: "1.5s", Inline: true},
		},
	}
	embed.Footer.Text = "cc-connect v1.0"

	// Verify structure
	assert.Equal(t, "Test Result", embed.Title)
	assert.Equal(t, "This is a test embed description", embed.Description)
	assert.Equal(t, 0x3498db, embed.Color)
	assert.Len(t, embed.Fields, 2)
	assert.Equal(t, "Status", embed.Fields[0].Name)
	assert.Equal(t, "Success", embed.Fields[0].Value)
	assert.True(t, embed.Fields[0].Inline)
	assert.Equal(t, "cc-connect v1.0", embed.Footer.Text)

	t.Log("Discord embed: PASS")
}

// ---------------------------------------------------------------------------
// T-242: Telegram 命令处理测试
// ---------------------------------------------------------------------------

func TestRegression_TelegramCommand(t *testing.T) {
	// Simulate Telegram command parsing
	testCases := []struct {
		input    string
		wantCmd  string
		wantArgs string
		isCMD    bool
	}{
		{"/start", "start", "", true},
		{"/start arg1 arg2", "start", "arg1 arg2", true},
		{"/help@botname", "help", "", true},
		{"/search query text", "search", "query text", true},
		{"just a regular message", "", "", false},
		{"", "", "", false},
	}

	for _, tc := range testCases {
		t.Run(tc.input, func(t *testing.T) {
			var cmd, args string
			var isCMD bool

			if len(tc.input) > 0 && tc.input[0] == '/' {
				isCMD = true
				// Simple command parsing
				parts := strings.SplitN(tc.input[1:], " ", 2)
				cmd = parts[0]
				// Remove @botname suffix if present
				if idx := strings.Index(cmd, "@"); idx > 0 {
					cmd = cmd[:idx]
				}
				if len(parts) > 1 {
					args = parts[1]
				}
			}

			assert.Equal(t, tc.isCMD, isCMD)
			if tc.isCMD {
				assert.Equal(t, tc.wantCmd, cmd)
				assert.Equal(t, tc.wantArgs, args)
			}
		})
	}

	t.Log("Telegram command: PASS")
}

// ---------------------------------------------------------------------------
// T-243: 钉钉加解密测试
// ---------------------------------------------------------------------------

func TestRegression_DingtalkCrypto(t *testing.T) {
	// Test signature verification logic (simplified)
	testCases := []struct {
		name        string
		signature   string
		timestamp   string
		nonce       string
		token       string
		expectValid bool
	}{
		{
			name:        "valid signature",
			signature:   "test-signature",
			timestamp:   "1234567890",
			nonce:       "random-nonce",
			token:       "test-token",
			expectValid: true,
		},
		{
			name:        "empty signature",
			signature:   "",
			timestamp:   "1234567890",
			nonce:       "random-nonce",
			token:       "test-token",
			expectValid: false,
		},
	}

	for _, tc := range testCases {
		t.Run(tc.name, func(t *testing.T) {
			// Simulate signature validation
			valid := len(tc.signature) > 0
			assert.Equal(t, tc.expectValid, valid)
		})
	}

	// Test plaintext encryption/decryption (EchoAPI encryption mode)
	plaintext := "test-message-content"
	encrypted := plaintext // In real implementation, this would be encrypted
	decrypted := encrypted // In real implementation, this would be decrypted

	assert.Equal(t, plaintext, decrypted)
	assert.NotEmpty(t, plaintext)

	t.Log("DingTalk crypto: PASS")
}

// ---------------------------------------------------------------------------
// T-252: Cron 任务取消测试
// ---------------------------------------------------------------------------

func TestRegression_CronCancel(t *testing.T) {
	tmpDir := t.TempDir()
	store, err := core.NewCronStore(tmpDir)
	require.NoError(t, err)

	// Add a cron job
	job := &core.CronJob{
		ID:          "cancel-test-job",
		Description: "Test cancellation",
		Prompt:      "Run test",
		CronExpr:    "*/5 * * * *",
		Enabled:     true,
	}
	err = store.Add(job)
	require.NoError(t, err)

	// Verify job was added
	jobs := store.List()
	assert.Len(t, jobs, 1)
	assert.Equal(t, "cancel-test-job", jobs[0].ID)

	// Disable job (simulates cancel)
	ok := store.SetEnabled("cancel-test-job", false)
	assert.True(t, ok)

	// Verify job is disabled
	disabledJob := store.Get("cancel-test-job")
	assert.NotNil(t, disabledJob)
	assert.False(t, disabledJob.Enabled)

	// Remove job (permanent cancel)
	ok = store.Remove("cancel-test-job")
	assert.True(t, ok)

	// Verify job is gone
	jobs = store.List()
	assert.Empty(t, jobs)

	// Test removing non-existent job
	ok = store.Remove("non-existent-job")
	assert.False(t, ok)

	t.Log("Cron cancel: PASS")
}