package tools

import (
	"context"
	"encoding/json"
	"os"
	"path/filepath"
	"runtime"
	"strings"
	"testing"
	"time"

	"github.com/stretchr/testify/require"

	"github.com/sipeed/picoclaw/pkg/config"
)

// TestShellTool_Success verifies successful command execution
func TestShellTool_Success(t *testing.T) {
	tool, err := NewExecTool("", false)
	if err != nil {
		t.Errorf("unable to configure exec tool: %s", err)
	}

	ctx := context.Background()
	args := map[string]any{
		"action":  "run",
		"command": "echo 'hello world'",
	}

	result := tool.Execute(ctx, args)

	// Success should not be an error
	if result.IsError {
		t.Errorf("Expected success, got IsError=true: %s", result.ForLLM)
	}

	// ForUser should contain command output
	if !strings.Contains(result.ForUser, "hello world") {
		t.Errorf("Expected ForUser to contain 'hello world', got: %s", result.ForUser)
	}

	// ForLLM should contain full output
	if !strings.Contains(result.ForLLM, "hello world") {
		t.Errorf("Expected ForLLM to contain 'hello world', got: %s", result.ForLLM)
	}
}

// TestShellTool_Failure verifies failed command execution
func TestShellTool_Failure(t *testing.T) {
	tool, err := NewExecTool("", false)
	if err != nil {
		t.Errorf("unable to configure exec tool: %s", err)
	}

	ctx := context.Background()
	args := map[string]any{
		"action":  "run",
		"command": "ls /nonexistent_directory_12345",
	}

	result := tool.Execute(ctx, args)

	// Failure should be marked as error
	if !result.IsError {
		t.Errorf("Expected error for failed command, got IsError=false")
	}

	// ForUser should contain error information
	if result.ForUser == "" {
		t.Errorf("Expected ForUser to contain error info, got empty string")
	}

	// ForLLM should contain exit code or error
	if !strings.Contains(result.ForLLM, "Exit code") && result.ForUser == "" {
		t.Errorf("Expected ForLLM to contain exit code or error, got: %s", result.ForLLM)
	}
}

// TestShellTool_Timeout verifies command timeout handling
func TestShellTool_Timeout(t *testing.T) {
	tool, err := NewExecTool("", false)
	if err != nil {
		t.Errorf("unable to configure exec tool: %s", err)
	}

	tool.SetTimeout(100 * time.Millisecond)

	ctx := context.Background()
	args := map[string]any{
		"action":  "run",
		"command": "sleep 10",
	}

	result := tool.Execute(ctx, args)

	// Timeout should be marked as error
	if !result.IsError {
		t.Errorf("Expected error for timeout, got IsError=false")
	}

	// Should mention timeout
	if !strings.Contains(result.ForLLM, "timed out") && !strings.Contains(result.ForUser, "timed out") {
		t.Errorf("Expected timeout message, got ForLLM: %s, ForUser: %s", result.ForLLM, result.ForUser)
	}
}

// TestShellTool_WorkingDir verifies custom working directory
func TestShellTool_WorkingDir(t *testing.T) {
	// Create temp directory
	tmpDir := t.TempDir()
	testFile := filepath.Join(tmpDir, "test.txt")
	os.WriteFile(testFile, []byte("test content"), 0o644)

	tool, err := NewExecTool("", false)
	if err != nil {
		t.Errorf("unable to configure exec tool: %s", err)
	}

	ctx := context.Background()
	args := map[string]any{
		"action":  "run",
		"command": "cat test.txt",
		"cwd":     tmpDir,
	}

	result := tool.Execute(ctx, args)

	if result.IsError {
		t.Errorf("Expected success in custom working dir, got error: %s", result.ForLLM)
	}

	if !strings.Contains(result.ForUser, "test content") {
		t.Errorf("Expected output from custom dir, got: %s", result.ForUser)
	}
}

// TestShellTool_DangerousCommand verifies safety guard blocks dangerous commands
func TestShellTool_DangerousCommand(t *testing.T) {
	tool, err := NewExecTool("", false)
	if err != nil {
		t.Errorf("unable to configure exec tool: %s", err)
	}

	ctx := context.Background()
	args := map[string]any{
		"action":  "run",
		"command": "rm -rf /",
	}

	result := tool.Execute(ctx, args)

	// Dangerous command should be blocked
	if !result.IsError {
		t.Errorf("Expected dangerous command to be blocked (IsError=true)")
	}

	if !strings.Contains(result.ForLLM, "blocked") && !strings.Contains(result.ForUser, "blocked") {
		t.Errorf("Expected 'blocked' message, got ForLLM: %s, ForUser: %s", result.ForLLM, result.ForUser)
	}
}

func TestShellTool_DangerousCommand_KillBlocked(t *testing.T) {
	tool, err := NewExecTool("", false)
	if err != nil {
		t.Errorf("unable to configure exec tool: %s", err)
	}

	ctx := context.Background()
	args := map[string]any{
		"action":  "run",
		"command": "kill 12345",
	}

	result := tool.Execute(ctx, args)
	if !result.IsError {
		t.Errorf("Expected kill command to be blocked")
	}
	if !strings.Contains(result.ForLLM, "blocked") && !strings.Contains(result.ForUser, "blocked") {
		t.Errorf("Expected blocked message, got ForLLM: %s, ForUser: %s", result.ForLLM, result.ForUser)
	}
}

// TestShellTool_MissingCommand verifies error handling for missing command
func TestShellTool_MissingCommand(t *testing.T) {
	tool, err := NewExecTool("", false)
	if err != nil {
		t.Errorf("unable to configure exec tool: %s", err)
	}

	ctx := context.Background()
	args := map[string]any{}

	result := tool.Execute(ctx, args)

	// Should return error result
	if !result.IsError {
		t.Errorf("Expected error when command is missing")
	}
}

// TestShellTool_StderrCapture verifies stderr is captured and included
func TestShellTool_StderrCapture(t *testing.T) {
	tool, err := NewExecTool("", false)
	if err != nil {
		t.Errorf("unable to configure exec tool: %s", err)
	}

	ctx := context.Background()
	args := map[string]any{
		"action":  "run",
		"command": "sh -c 'echo stdout; echo stderr >&2'",
	}

	result := tool.Execute(ctx, args)

	// Both stdout and stderr should be in output
	if !strings.Contains(result.ForLLM, "stdout") {
		t.Errorf("Expected stdout in output, got: %s", result.ForLLM)
	}
	if !strings.Contains(result.ForLLM, "stderr") {
		t.Errorf("Expected stderr in output, got: %s", result.ForLLM)
	}
}

// TestShellTool_OutputTruncation verifies long output is truncated
func TestShellTool_OutputTruncation(t *testing.T) {
	tool, err := NewExecTool("", false)
	if err != nil {
		t.Errorf("unable to configure exec tool: %s", err)
	}

	ctx := context.Background()
	// Generate long output (>10000 chars)
	args := map[string]any{
		"action":  "run",
		"command": "python3 -c \"print('x' * 20000)\" || echo " + strings.Repeat("x", 20000),
	}

	result := tool.Execute(ctx, args)

	// Should have truncation message or be truncated
	if len(result.ForLLM) > 15000 {
		t.Errorf("Expected output to be truncated, got length: %d", len(result.ForLLM))
	}
}

// TestShellTool_WorkingDir_OutsideWorkspace verifies that working_dir cannot escape the workspace directly
func TestShellTool_WorkingDir_OutsideWorkspace(t *testing.T) {
	root := t.TempDir()
	workspace := filepath.Join(root, "workspace")
	outsideDir := filepath.Join(root, "outside")
	if err := os.MkdirAll(workspace, 0o755); err != nil {
		t.Fatalf("failed to create workspace: %v", err)
	}
	if err := os.MkdirAll(outsideDir, 0o755); err != nil {
		t.Fatalf("failed to create outside dir: %v", err)
	}

	tool, err := NewExecTool(workspace, true)
	if err != nil {
		t.Errorf("unable to configure exec tool: %s", err)
	}

	result := tool.Execute(context.Background(), map[string]any{
		"action":  "run",
		"command": "pwd",
		"cwd":     outsideDir,
	})

	if !result.IsError {
		t.Fatalf("expected working_dir outside workspace to be blocked, got output: %s", result.ForLLM)
	}
	if !strings.Contains(result.ForLLM, "blocked") {
		t.Errorf("expected 'blocked' in error, got: %s", result.ForLLM)
	}
}

// TestShellTool_WorkingDir_SymlinkEscape verifies that a symlink inside the workspace
// pointing outside cannot be used as working_dir to escape the sandbox.
func TestShellTool_WorkingDir_SymlinkEscape(t *testing.T) {
	root := t.TempDir()
	workspace := filepath.Join(root, "workspace")
	secretDir := filepath.Join(root, "secret")
	if err := os.MkdirAll(workspace, 0o755); err != nil {
		t.Fatalf("failed to create workspace: %v", err)
	}
	if err := os.MkdirAll(secretDir, 0o755); err != nil {
		t.Fatalf("failed to create secret dir: %v", err)
	}
	os.WriteFile(filepath.Join(secretDir, "secret.txt"), []byte("top secret"), 0o644)

	// symlink lives inside the workspace but resolves to secretDir outside it
	link := filepath.Join(workspace, "escape")
	if err := os.Symlink(secretDir, link); err != nil {
		t.Skipf("symlinks not supported in this environment: %v", err)
	}

	tool, err := NewExecTool(workspace, true)
	if err != nil {
		t.Errorf("unable to configure exec tool: %s", err)
	}

	result := tool.Execute(context.Background(), map[string]any{
		"action":  "run",
		"command": "cat secret.txt",
		"cwd":     link,
	})

	if !result.IsError {
		t.Fatalf("expected symlink working_dir escape to be blocked, got output: %s", result.ForLLM)
	}
	if !strings.Contains(result.ForLLM, "blocked") {
		t.Errorf("expected 'blocked' in error, got: %s", result.ForLLM)
	}
}

// TestShellTool_RemoteChannelBlockedByDefault verifies exec is blocked for remote channels
func TestShellTool_RemoteChannelBlockedByDefault(t *testing.T) {
	cfg := &config.Config{}
	cfg.Tools.Exec.EnableDenyPatterns = true
	cfg.Tools.Exec.AllowRemote = false

	tool, err := NewExecToolWithConfig("", false, cfg)
	if err != nil {
		t.Fatalf("NewExecToolWithConfig() error: %v", err)
	}
	ctx := WithToolContext(context.Background(), "telegram", "chat-1")
	result := tool.Execute(ctx, map[string]any{"action": "run", "command": "echo hi"})

	if !result.IsError {
		t.Fatal("expected remote-channel exec to be blocked")
	}
	if !strings.Contains(result.ForLLM, "restricted to internal channels") {
		t.Errorf("expected 'restricted to internal channels' message, got: %s", result.ForLLM)
	}
}

// TestShellTool_InternalChannelAllowed verifies exec is allowed for internal channels
func TestShellTool_InternalChannelAllowed(t *testing.T) {
	cfg := &config.Config{}
	cfg.Tools.Exec.EnableDenyPatterns = true
	cfg.Tools.Exec.AllowRemote = false

	tool, err := NewExecToolWithConfig("", false, cfg)
	if err != nil {
		t.Fatalf("NewExecToolWithConfig() error: %v", err)
	}
	ctx := WithToolContext(context.Background(), "cli", "direct")
	result := tool.Execute(ctx, map[string]any{"action": "run", "command": "echo hi"})

	if result.IsError {
		t.Fatalf("expected internal channel exec to succeed, got: %s", result.ForLLM)
	}
	if !strings.Contains(result.ForLLM, "hi") {
		t.Errorf("expected output to contain 'hi', got: %s", result.ForLLM)
	}
}

// TestShellTool_EmptyChannelBlockedWhenNotAllowRemote verifies fail-closed when no channel context
func TestShellTool_EmptyChannelBlockedWhenNotAllowRemote(t *testing.T) {
	cfg := &config.Config{}
	cfg.Tools.Exec.EnableDenyPatterns = true
	cfg.Tools.Exec.AllowRemote = false

	tool, err := NewExecToolWithConfig("", false, cfg)
	if err != nil {
		t.Fatalf("NewExecToolWithConfig() error: %v", err)
	}
	result := tool.Execute(context.Background(), map[string]any{
		"command": "echo hi",
	})

	if !result.IsError {
		t.Fatal("expected exec with empty channel to be blocked when allowRemote=false")
	}
}

// TestShellTool_AllowRemoteBypassesChannelCheck verifies allowRemote=true permits any channel
func TestShellTool_AllowRemoteBypassesChannelCheck(t *testing.T) {
	cfg := &config.Config{}
	cfg.Tools.Exec.EnableDenyPatterns = true
	cfg.Tools.Exec.AllowRemote = true

	tool, err := NewExecToolWithConfig("", false, cfg)
	if err != nil {
		t.Fatalf("NewExecToolWithConfig() error: %v", err)
	}
	ctx := WithToolContext(context.Background(), "telegram", "chat-1")
	result := tool.Execute(ctx, map[string]any{"action": "run", "command": "echo hi"})

	if result.IsError {
		t.Fatalf("expected allowRemote=true to permit remote channel, got: %s", result.ForLLM)
	}
}

// TestShellTool_RestrictToWorkspace verifies workspace restriction
func TestShellTool_RestrictToWorkspace(t *testing.T) {
	tmpDir := t.TempDir()
	tool, err := NewExecTool(tmpDir, false)
	if err != nil {
		t.Errorf("unable to configure exec tool: %s", err)
	}

	tool.SetRestrictToWorkspace(true)

	ctx := context.Background()
	args := map[string]any{
		"action":  "run",
		"command": "cat ../../etc/passwd",
	}

	result := tool.Execute(ctx, args)

	// Path traversal should be blocked
	if !result.IsError {
		t.Errorf("Expected path traversal to be blocked with restrictToWorkspace=true")
	}

	if !strings.Contains(result.ForLLM, "blocked") && !strings.Contains(result.ForUser, "blocked") {
		t.Errorf(
			"Expected 'blocked' message for path traversal, got ForLLM: %s, ForUser: %s",
			result.ForLLM,
			result.ForUser,
		)
	}
}

// TestShellTool_DevNullAllowed verifies that /dev/null redirections are not blocked (issue #964).
func TestShellTool_DevNullAllowed(t *testing.T) {
	tmpDir := t.TempDir()
	tool, err := NewExecTool(tmpDir, true)
	if err != nil {
		t.Fatalf("unable to configure exec tool: %s", err)
	}

	commands := []string{
		"echo hello 2>/dev/null",
		"echo hello >/dev/null",
		"echo hello > /dev/null",
		"echo hello 2> /dev/null",
		"echo hello >/dev/null 2>&1",
		"find " + tmpDir + " -name '*.go' 2>/dev/null",
	}

	for _, cmd := range commands {
		result := tool.Execute(context.Background(), map[string]any{"action": "run", "command": cmd})
		if result.IsError && strings.Contains(result.ForLLM, "blocked") {
			t.Errorf("command should not be blocked: %s\n  error: %s", cmd, result.ForLLM)
		}
	}
}

// TestShellTool_BlockDevices verifies that writes to block devices are blocked (issue #965).
func TestShellTool_BlockDevices(t *testing.T) {
	tool, err := NewExecTool("", false)
	if err != nil {
		t.Fatalf("unable to configure exec tool: %s", err)
	}

	blocked := []string{
		"echo x > /dev/sda",
		"echo x > /dev/hda",
		"echo x > /dev/vda",
		"echo x > /dev/xvda",
		"echo x > /dev/nvme0n1",
		"echo x > /dev/mmcblk0",
		"echo x > /dev/loop0",
		"echo x > /dev/dm-0",
		"echo x > /dev/md0",
		"echo x > /dev/sr0",
		"echo x > /dev/nbd0",
	}

	for _, cmd := range blocked {
		result := tool.Execute(context.Background(), map[string]any{"action": "run", "command": cmd})
		if !result.IsError {
			t.Errorf("expected block device write to be blocked: %s", cmd)
		}
	}
}

// TestShellTool_SafePathsInWorkspaceRestriction verifies that safe kernel pseudo-devices
// are allowed even when workspace restriction is active.
func TestShellTool_SafePathsInWorkspaceRestriction(t *testing.T) {
	tmpDir := t.TempDir()
	tool, err := NewExecTool(tmpDir, true)
	if err != nil {
		t.Fatalf("unable to configure exec tool: %s", err)
	}

	// These reference paths outside workspace but should be allowed via safePaths.
	commands := []string{
		"cat /dev/urandom | head -c 16 | od",
		"echo test > /dev/null",
		"dd if=/dev/zero bs=1 count=1",
	}

	for _, cmd := range commands {
		result := tool.Execute(context.Background(), map[string]any{"action": "run", "command": cmd})
		if result.IsError && strings.Contains(result.ForLLM, "path outside working dir") {
			t.Errorf("safe path should not be blocked by workspace check: %s\n  error: %s", cmd, result.ForLLM)
		}
	}
}

// TestShellTool_ExitCodeDetails verifies that exit codes are captured with details
func TestShellTool_ExitCodeDetails(t *testing.T) {
	tool, err := NewExecTool("", false)
	if err != nil {
		t.Fatalf("unable to configure exec tool: %s", err)
	}

	ctx := context.Background()
	args := map[string]any{
		"action":  "run",
		"command": "sh -c 'exit 42'",
	}

	result := tool.Execute(ctx, args)

	if !result.IsError {
		t.Error("expected error for non-zero exit code")
	}

	// Should contain the exit code in the message (new format: "exited with code 42")
	if !strings.Contains(result.ForLLM, "42") {
		t.Errorf("expected exit code 42 in error message, got: %s", result.ForLLM)
	}

	// Verify the new detailed message format
	if !strings.Contains(result.ForLLM, "exited with code") {
		t.Errorf("expected 'exited with code' in message, got: %s", result.ForLLM)
	}

	// Err field is set by the exec system (may or may not be set depending on implementation)
	// The important thing is that IsError=true
	t.Logf("Exit code result: %s", result.ForLLM)
}

// TestShellTool_TimeoutWithPartialOutput verifies timeout includes partial output
func TestShellTool_TimeoutWithPartialOutput(t *testing.T) {
	tool, err := NewExecTool("", false)
	if err != nil {
		t.Fatalf("unable to configure exec tool: %s", err)
	}

	tool.SetTimeout(1 * time.Second) // Give more time for echo to complete

	ctx := context.Background()
	// Use a command that outputs immediately then sleeps
	args := map[string]any{
		"action":  "run",
		"command": "echo 'partial output before timeout' && sleep 30",
	}

	result := tool.Execute(ctx, args)

	if !result.IsError {
		t.Error("expected error for timeout")
	}

	// Should mention timeout
	if !strings.Contains(result.ForLLM, "timed out") {
		t.Errorf("expected 'timed out' in message, got: %s", result.ForLLM)
	}

	// Log the result for debugging (partial output depends on shell behavior)
	t.Logf("Timeout result: %s", result.ForLLM)
}

// TestShellTool_CustomAllowPatterns verifies that custom allow patterns exempt
// commands from deny pattern checks.
func TestShellTool_CustomAllowPatterns(t *testing.T) {
	cfg := &config.Config{
		Tools: config.ToolsConfig{
			Exec: config.ExecConfig{
				EnableDenyPatterns:  true,
				CustomAllowPatterns: []string{`\bgit\s+push\s+origin\b`},
			},
		},
	}

	tool, err := NewExecToolWithConfig("", false, cfg)
	if err != nil {
		t.Fatalf("unable to configure exec tool: %s", err)
	}

	// "git push origin main" should be allowed by custom allow pattern.
	result := tool.Execute(context.Background(), map[string]any{
		"command": "git push origin main",
	})
	if result.IsError && strings.Contains(result.ForLLM, "blocked") {
		t.Errorf("custom allow pattern should exempt 'git push origin main', got: %s", result.ForLLM)
	}

	// "git push upstream main" should still be blocked (does not match allow pattern).
	result = tool.Execute(context.Background(), map[string]any{
		"command": "git push upstream main",
	})
	if !result.IsError {
		t.Errorf("'git push upstream main' should still be blocked by deny pattern")
	}
}

// TestShellTool_URLsNotBlocked verifies that commands containing URLs are not
// incorrectly blocked by the workspace restriction safety guard (issue #1203).
func TestShellTool_URLsNotBlocked(t *testing.T) {
	tmpDir := t.TempDir()
	tool, err := NewExecTool(tmpDir, true)
	if err != nil {
		t.Fatalf("unable to configure exec tool: %s", err)
	}

	// These commands contain URLs and should NOT be blocked by workspace restriction.
	// The URL path components (e.g., "//github.com") should be recognized as URLs,
	// not as file system paths.
	commands := []string{
		"agent-browser open https://github.com",
		"curl https://api.example.com/data",
		"wget http://example.com/file",
		"browser open https://github.com/user/repo",
		"fetch ftp://ftp.example.com/file.txt",
		"git clone https://github.com/sipeed/picoclaw.git",
	}

	for _, cmd := range commands {
		ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
		result := tool.Execute(ctx, map[string]any{"action": "run", "command": cmd})
		cancel()
		if result.IsError && strings.Contains(result.ForLLM, "path outside working dir") {
			t.Errorf("command with URL should not be blocked by workspace check: %s\n  error: %s", cmd, result.ForLLM)
		}
	}
}

// TestShellTool_FileURISandboxing verifies that file:// URIs that escape the
// workspace are still blocked, even though other URLs are allowed (issue #1254).
func TestShellTool_FileURISandboxing(t *testing.T) {
	tmpDir := t.TempDir()
	tool, err := NewExecTool(tmpDir, true)
	if err != nil {
		t.Fatalf("unable to configure exec tool: %s", err)
	}

	// These file:// URIs should be blocked if they reference paths outside the workspace.
	// Unlike web URLs (http://, https://, ftp://), file:// URIs can be used to escape the sandbox.
	blockedCommands := []string{
		"cat file:///etc/passwd",
		"cat file:///etc/hosts",
		"cat file:///root/.ssh/id_rsa",
	}

	for _, cmd := range blockedCommands {
		result := tool.Execute(context.Background(), map[string]any{"action": "run", "command": cmd})
		if !result.IsError || !strings.Contains(result.ForLLM, "path outside working dir") {
			t.Errorf("file:// URI outside workspace should be blocked: %s", cmd)
		}
	}

	// These file:// URIs should be allowed if they reference paths inside the workspace.
	// Create a test file inside the temp directory
	testFile := filepath.Join(tmpDir, "test.txt")
	if err := os.WriteFile(testFile, []byte("test content"), 0o644); err != nil {
		t.Fatalf("failed to create test file: %s", err)
	}

	allowedCommands := []string{
		"cat file://" + testFile,
	}

	for _, cmd := range allowedCommands {
		result := tool.Execute(context.Background(), map[string]any{"action": "run", "command": cmd})
		if result.IsError && strings.Contains(result.ForLLM, "path outside working dir") {
			t.Errorf("file:// URI inside workspace should be allowed: %s\n  error: %s", cmd, result.ForLLM)
		}
	}
}

// TestShellTool_URLBypassPrevented verifies that a command cannot bypass the workspace
// sandbox by smuggling a real path after a URL that contains the same //path substring.
// e.g. "echo https://etc/passwd && cat //etc/passwd" must still be blocked.
func TestShellTool_URLBypassPrevented(t *testing.T) {
	tmpDir := t.TempDir()
	tool, err := NewExecTool(tmpDir, true)
	if err != nil {
		t.Fatalf("unable to configure exec tool: %s", err)
	}

	// The path //etc/passwd appears twice: once as the host part of an https URL
	// and once as a real (escaped) absolute path. The guard must block the command
	// because the second occurrence is a genuine out-of-workspace path.
	blockedCommands := []string{
		"echo https://etc/passwd && cat //etc/passwd",
		"curl https://host/file && ls //etc",
	}

	for _, cmd := range blockedCommands {
		result := tool.Execute(context.Background(), map[string]any{"action": "run", "command": cmd})
		if !result.IsError || !strings.Contains(result.ForLLM, "path outside working dir") {
			t.Errorf("bypass attempt should be blocked: %q\n  got: %s", cmd, result.ForLLM)
		}
	}
}

func TestShellTool_Background_ReturnsImmediately(t *testing.T) {
	tool, err := NewExecTool("", false)
	require.NoError(t, err)

	ctx := context.Background()
	args := map[string]any{
		"action":     "run",
		"command":    "sleep 5",
		"background": "true",
	}

	start := time.Now()
	result := tool.Execute(ctx, args)
	elapsed := time.Since(start)

	require.False(t, result.IsError, "background run should not error: %s", result.ForLLM)
	require.Less(t, elapsed, time.Second, "background run should return immediately")
	require.Contains(t, result.ForLLM, "sessionId")
}

func TestShellTool_List_Empty(t *testing.T) {
	tool, err := NewExecTool("", false)
	require.NoError(t, err)

	sm := NewSessionManager()
	tool.sessionManager = sm

	ctx := context.Background()
	args := map[string]any{"action": "list"}

	result := tool.Execute(ctx, args)
	require.False(t, result.IsError)
	require.Contains(t, result.ForUser, "0 active sessions")
}

func TestShellTool_RunBackground_List(t *testing.T) {
	tool, err := NewExecTool("", false)
	require.NoError(t, err)

	sm := NewSessionManager()
	tool.sessionManager = sm

	ctx := WithToolContext(context.Background(), "cli", "test")

	runResult := tool.Execute(ctx, map[string]any{
		"action":     "run",
		"command":    "sleep 10",
		"background": "true",
	})
	require.False(t, runResult.IsError, "run should succeed: %s", runResult.ForLLM)

	var resp ExecResponse
	err = json.Unmarshal([]byte(runResult.ForLLM), &resp)
	require.NoError(t, err)
	require.NotEmpty(t, resp.SessionID)

	time.Sleep(100 * time.Millisecond)

	listResult := tool.Execute(ctx, map[string]any{"action": "list"})
	require.False(t, listResult.IsError)

	var listResp ExecResponse
	err = json.Unmarshal([]byte(listResult.ForLLM), &listResp)
	require.NoError(t, err)
	require.Len(t, listResp.Sessions, 1)
	require.Equal(t, resp.SessionID, listResp.Sessions[0].ID)

	killResult := tool.Execute(ctx, map[string]any{
		"action":    "kill",
		"sessionId": resp.SessionID,
	})
	require.False(t, killResult.IsError, "kill should succeed: %s", killResult.ForLLM)
}

func TestShellTool_Read_Output(t *testing.T) {
	tool, err := NewExecTool("", false)
	require.NoError(t, err)

	sm := NewSessionManager()
	tool.sessionManager = sm

	ctx := WithToolContext(context.Background(), "cli", "test")

	runResult := tool.Execute(ctx, map[string]any{
		"action":     "run",
		"command":    "echo hello",
		"background": "true",
	})
	require.False(t, runResult.IsError)

	var resp ExecResponse
	err = json.Unmarshal([]byte(runResult.ForLLM), &resp)
	require.NoError(t, err)

	time.Sleep(200 * time.Millisecond)

	readResult := tool.Execute(ctx, map[string]any{
		"action":    "read",
		"sessionId": resp.SessionID,
	})

	if !readResult.IsError {
		var readResp ExecResponse
		err = json.Unmarshal([]byte(readResult.ForLLM), &readResp)
		require.NoError(t, err)
	}
}

func TestShellTool_Kill(t *testing.T) {
	tool, err := NewExecTool("", false)
	require.NoError(t, err)

	sm := NewSessionManager()
	tool.sessionManager = sm

	ctx := WithToolContext(context.Background(), "cli", "test")

	runResult := tool.Execute(ctx, map[string]any{
		"action":     "run",
		"command":    "sleep 100",
		"background": "true",
	})
	require.False(t, runResult.IsError)

	var resp ExecResponse
	err = json.Unmarshal([]byte(runResult.ForLLM), &resp)
	require.NoError(t, err)

	killResult := tool.Execute(ctx, map[string]any{
		"action":    "kill",
		"sessionId": resp.SessionID,
	})
	require.False(t, killResult.IsError, "kill should succeed: %s", killResult.ForLLM)

	time.Sleep(100 * time.Millisecond)

	listResult := tool.Execute(ctx, map[string]any{"action": "list"})
	var listResp ExecResponse
	err = json.Unmarshal([]byte(listResult.ForLLM), &listResp)
	require.NoError(t, err)
	require.Len(t, listResp.Sessions, 0)
}

func TestShellTool_PTY_AllowedCommands(t *testing.T) {
	if runtime.GOOS == "windows" {
		t.Skip("PTY not supported on Windows")
	}

	tool, err := NewExecTool("", false)
	require.NoError(t, err)

	sm := NewSessionManager()
	tool.sessionManager = sm

	ctx := WithToolContext(context.Background(), "cli", "test")

	// Test that PTY is allowed for non-interpreter commands
	result := tool.Execute(ctx, map[string]any{
		"action":     "run",
		"command":    "cat",
		"pty":        "true",
		"background": "true",
	})
	require.False(t, result.IsError, "PTY with cat should succeed: %s", result.ForLLM)
	require.Contains(t, result.ForLLM, "sessionId")

	var resp ExecResponse
	err = json.Unmarshal([]byte(result.ForLLM), &resp)
	require.NoError(t, err)
	require.NotEmpty(t, resp.SessionID)

	// Clean up
	tool.Execute(ctx, map[string]any{
		"action":    "kill",
		"sessionId": resp.SessionID,
	})
}

func TestShellTool_PTY_WriteRead(t *testing.T) {
	if runtime.GOOS == "windows" {
		t.Skip("PTY not supported on Windows")
	}

	tool, err := NewExecTool("", false)
	require.NoError(t, err)

	sm := NewSessionManager()
	tool.sessionManager = sm

	ctx := WithToolContext(context.Background(), "cli", "test")

	// Start a PTY session with a command that waits for input
	// Using 'cat' which will wait for stdin
	result := tool.Execute(ctx, map[string]any{
		"action":     "run",
		"command":    "cat",
		"pty":        "true",
		"background": "true",
	})
	require.False(t, result.IsError, "PTY run should succeed: %s", result.ForLLM)

	var resp ExecResponse
	err = json.Unmarshal([]byte(result.ForLLM), &resp)
	require.NoError(t, err)

	// Write some input to cat
	writeResult := tool.Execute(ctx, map[string]any{
		"action":    "write",
		"sessionId": resp.SessionID,
		"data":      "hello\n",
	})
	require.False(t, writeResult.IsError, "write should succeed: %s", writeResult.ForLLM)

	// Give cat time to process and output
	time.Sleep(200 * time.Millisecond)

	// Read the output
	readResult := tool.Execute(ctx, map[string]any{
		"action":    "read",
		"sessionId": resp.SessionID,
	})

	require.False(t, readResult.IsError, "read should succeed: %s", readResult.ForLLM)

	var readResp ExecResponse
	err = json.Unmarshal([]byte(readResult.ForLLM), &readResp)
	require.NoError(t, err)
	// PTY output should contain "hello"
	require.Contains(t, readResp.Output, "hello")

	// Clean up
	tool.Execute(ctx, map[string]any{
		"action":    "kill",
		"sessionId": resp.SessionID,
	})
}

func TestShellTool_PTY_Poll(t *testing.T) {
	if runtime.GOOS == "windows" {
		t.Skip("PTY not supported on Windows")
	}

	tool, err := NewExecTool("", false)
	require.NoError(t, err)

	sm := NewSessionManager()
	tool.sessionManager = sm

	ctx := WithToolContext(context.Background(), "cli", "test")

	// Start a PTY session with a long-running command
	result := tool.Execute(ctx, map[string]any{
		"action":     "run",
		"command":    "sleep 2",
		"pty":        "true",
		"background": "true",
	})
	require.False(t, result.IsError, "PTY run should succeed: %s", result.ForLLM)

	var resp ExecResponse
	err = json.Unmarshal([]byte(result.ForLLM), &resp)
	require.NoError(t, err)

	// Poll should show running
	pollResult := tool.Execute(ctx, map[string]any{
		"action":    "poll",
		"sessionId": resp.SessionID,
	})
	require.False(t, pollResult.IsError, "poll should succeed: %s", pollResult.ForLLM)

	var pollResp ExecResponse
	err = json.Unmarshal([]byte(pollResult.ForLLM), &pollResp)
	require.NoError(t, err)
	require.Equal(t, "running", pollResp.Status)

	// Wait for sleep to complete
	time.Sleep(2500 * time.Millisecond)

	// Poll should show done
	pollResult = tool.Execute(ctx, map[string]any{
		"action":    "poll",
		"sessionId": resp.SessionID,
	})
	require.False(t, pollResult.IsError)

	err = json.Unmarshal([]byte(pollResult.ForLLM), &pollResp)
	require.NoError(t, err)
	require.Equal(t, "done", pollResp.Status)
}

func TestShellTool_PTY_Kill(t *testing.T) {
	if runtime.GOOS == "windows" {
		t.Skip("PTY not supported on Windows")
	}

	tool, err := NewExecTool("", false)
	require.NoError(t, err)

	sm := NewSessionManager()
	tool.sessionManager = sm

	ctx := WithToolContext(context.Background(), "cli", "test")

	// Start a PTY session with a long-running command
	result := tool.Execute(ctx, map[string]any{
		"action":     "run",
		"command":    "sleep 10",
		"pty":        "true",
		"background": "true",
	})
	require.False(t, result.IsError, "PTY run should succeed: %s", result.ForLLM)

	var resp ExecResponse
	err = json.Unmarshal([]byte(result.ForLLM), &resp)
	require.NoError(t, err)

	// Kill the session
	killResult := tool.Execute(ctx, map[string]any{
		"action":    "kill",
		"sessionId": resp.SessionID,
	})
	require.False(t, killResult.IsError, "kill should succeed: %s", killResult.ForLLM)

	// Verify kill response shows done status
	var killResp ExecResponse
	err = json.Unmarshal([]byte(killResult.ForLLM), &killResp)
	require.NoError(t, err)
	require.Equal(t, "done", killResp.Status)

	// Poll should return error since session is removed after kill
	pollResult := tool.Execute(ctx, map[string]any{
		"action":    "poll",
		"sessionId": resp.SessionID,
	})
	// Session is removed after kill, so poll returns error with "session not found"
	require.True(t, pollResult.IsError, "poll should error after kill (session removed)")
	require.Contains(t, pollResult.ForLLM, "session not found")
}

func TestShellTool_Write_Read_NonPTY(t *testing.T) {
	tool, err := NewExecTool("", false)
	require.NoError(t, err)

	sm := NewSessionManager()
	tool.sessionManager = sm

	ctx := WithToolContext(context.Background(), "cli", "test")

	// Start a background process that reads from stdin and outputs it
	// Using 'cat' which echoes stdin to stdout
	result := tool.Execute(ctx, map[string]any{
		"action":     "run",
		"command":    "cat",
		"pty":        false,
		"background": "true",
	})
	require.False(t, result.IsError, "run should succeed: %s", result.ForLLM)

	var resp ExecResponse
	err = json.Unmarshal([]byte(result.ForLLM), &resp)
	require.NoError(t, err)

	// Write some input to cat
	writeResult := tool.Execute(ctx, map[string]any{
		"action":    "write",
		"sessionId": resp.SessionID,
		"data":      "hello world\n",
	})
	require.False(t, writeResult.IsError, "write should succeed: %s", writeResult.ForLLM)

	// Give cat time to process and output
	time.Sleep(200 * time.Millisecond)

	// Read the output
	readResult := tool.Execute(ctx, map[string]any{
		"action":    "read",
		"sessionId": resp.SessionID,
	})
	require.False(t, readResult.IsError, "read should succeed: %s", readResult.ForLLM)

	var readResp ExecResponse
	err = json.Unmarshal([]byte(readResult.ForLLM), &readResp)
	require.NoError(t, err)
	require.Contains(t, readResp.Output, "hello world")

	// Clean up
	tool.Execute(ctx, map[string]any{
		"action":    "kill",
		"sessionId": resp.SessionID,
	})
}

func TestShellTool_Read_NonPTY_Running(t *testing.T) {
	tool, err := NewExecTool("", false)
	require.NoError(t, err)

	sm := NewSessionManager()
	tool.sessionManager = sm

	ctx := WithToolContext(context.Background(), "cli", "test")

	// Start a long-running process that produces output over time
	// Using sh -c with sleep at the end so process doesn't exit immediately
	result := tool.Execute(ctx, map[string]any{
		"action":     "run",
		"command":    "sh -c 'echo line1; sleep 0.5; echo line2; sleep 0.5; echo line3; sleep 10'",
		"pty":        false,
		"background": "true",
	})
	require.False(t, result.IsError, "run should succeed: %s", result.ForLLM)

	var resp ExecResponse
	err = json.Unmarshal([]byte(result.ForLLM), &resp)
	require.NoError(t, err)

	// Give time for first outputs to be produced
	time.Sleep(300 * time.Millisecond)

	// Read output while process is running
	readResult := tool.Execute(ctx, map[string]any{
		"action":    "read",
		"sessionId": resp.SessionID,
	})
	require.False(t, readResult.IsError, "read should succeed: %s", readResult.ForLLM)

	var readResp ExecResponse
	err = json.Unmarshal([]byte(readResult.ForLLM), &readResp)
	require.NoError(t, err)
	// Should have at least line1
	require.Contains(t, readResp.Output, "line1")

	// Wait for line3 to be produced (line1=0s, line2=0.5s, line3=1s, then sleep 10)
	time.Sleep(1200 * time.Millisecond)

	// Read again - should have line3 as well
	readResult = tool.Execute(ctx, map[string]any{
		"action":    "read",
		"sessionId": resp.SessionID,
	})
	require.False(t, readResult.IsError, "read should succeed: %s", readResult.ForLLM)

	err = json.Unmarshal([]byte(readResult.ForLLM), &readResp)
	require.NoError(t, err)
	require.Contains(t, readResp.Output, "line3")

	// Clean up
	tool.Execute(ctx, map[string]any{
		"action":    "kill",
		"sessionId": resp.SessionID,
	})
}

func TestShellTool_ProcessGroupKill(t *testing.T) {
	if runtime.GOOS == "windows" {
		t.Skip("Process group kill not supported on Windows")
	}

	// Note: Testing process group kill with PTY is tricky because the command
	// must be run through an interpreter (sh, bash) which is blocked for PTY.
	// Instead, we test with non-PTY mode which also uses Setsid for background processes.

	tool, err := NewExecTool("", false)
	require.NoError(t, err)

	sm := NewSessionManager()
	tool.sessionManager = sm

	ctx := WithToolContext(context.Background(), "cli", "test")

	// Start a shell that spawns child processes (non-PTY mode)
	// The sh -c command creates child sleep processes
	result := tool.Execute(ctx, map[string]any{
		"action":     "run",
		"command":    "sh -c 'sleep 30 & sleep 30 & wait'",
		"pty":        false,
		"background": "true",
	})
	require.False(t, result.IsError, "run should succeed: %s", result.ForLLM)

	var resp ExecResponse
	err = json.Unmarshal([]byte(result.ForLLM), &resp)
	require.NoError(t, err)

	// Give time for child processes to spawn
	time.Sleep(500 * time.Millisecond)

	// Kill the session - should kill the entire process group
	killResult := tool.Execute(ctx, map[string]any{
		"action":    "kill",
		"sessionId": resp.SessionID,
	})
	require.False(t, killResult.IsError, "kill should succeed: %s", killResult.ForLLM)

	// Verify kill response shows done status
	var killResp ExecResponse
	err = json.Unmarshal([]byte(killResult.ForLLM), &killResp)
	require.NoError(t, err)
	require.Equal(t, "done", killResp.Status)

	// Poll should return error since session is removed after kill
	pollResult := tool.Execute(ctx, map[string]any{
		"action":    "poll",
		"sessionId": resp.SessionID,
	})
	require.True(t, pollResult.IsError, "poll should error after kill (session removed)")
	require.Contains(t, pollResult.ForLLM, "session not found")
}

func TestShellTool_PTY_ProcessGroupKill(t *testing.T) {
	if runtime.GOOS == "windows" {
		t.Skip("PTY process group kill not supported on Windows")
	}

	// This test binary creates 4 child sleep processes and waits for signals.
	// It's not an interpreter, so it's allowed with PTY mode.
	// The binary is created in /tmp/test_pgroup.c and compiled as part of test setup.
	testBinary := "/tmp/test_pgroup"
	if _, err := os.Stat(testBinary); os.IsNotExist(err) {
		t.Skip("Test binary /tmp/test_pgroup not found - run: gcc -o /tmp/test_pgroup /tmp/test_pgroup.c")
	}

	tool, err := NewExecTool("", false)
	require.NoError(t, err)

	sm := NewSessionManager()
	tool.sessionManager = sm

	ctx := WithToolContext(context.Background(), "cli", "test")

	// Start the test binary with PTY mode
	// It forks 4 child sleep processes and waits for signals
	result := tool.Execute(ctx, map[string]any{
		"action":     "run",
		"command":    testBinary,
		"pty":        "true",
		"background": "true",
	})
	require.False(t, result.IsError, "run should succeed: %s", result.ForLLM)

	var resp ExecResponse
	err = json.Unmarshal([]byte(result.ForLLM), &resp)
	require.NoError(t, err)

	// Give time for child processes to spawn
	time.Sleep(500 * time.Millisecond)

	// Kill the session - should kill the entire process group
	killResult := tool.Execute(ctx, map[string]any{
		"action":    "kill",
		"sessionId": resp.SessionID,
	})
	require.False(t, killResult.IsError, "kill should succeed: %s", killResult.ForLLM)

	// Verify kill response shows done status
	var killResp ExecResponse
	err = json.Unmarshal([]byte(killResult.ForLLM), &killResp)
	require.NoError(t, err)
	require.Equal(t, "done", killResp.Status)

	// Poll should return error since session is removed after kill
	pollResult := tool.Execute(ctx, map[string]any{
		"action":    "poll",
		"sessionId": resp.SessionID,
	})
	require.True(t, pollResult.IsError, "poll should error after kill (session removed)")
	require.Contains(t, pollResult.ForLLM, "session not found")
}

func TestShellTool_PTY_Background_Read(t *testing.T) {
	if runtime.GOOS == "windows" {
		t.Skip("PTY not supported on Windows")
	}

	tool, err := NewExecTool("", false)
	require.NoError(t, err)

	sm := NewSessionManager()
	tool.sessionManager = sm

	ctx := WithToolContext(context.Background(), "cli", "test")

	// Start a fast command with PTY + background mode
	runResult := tool.Execute(ctx, map[string]any{
		"action":     "run",
		"command":    "echo hello",
		"pty":        "true",
		"background": "true",
	})
	require.False(t, runResult.IsError, "run should succeed: %s", runResult.ForLLM)

	var runResp ExecResponse
	err = json.Unmarshal([]byte(runResult.ForLLM), &runResp)
	require.NoError(t, err)
	require.NotEmpty(t, runResp.SessionID)
	require.Equal(t, "running", runResp.Status)

	// Wait for command to complete
	time.Sleep(500 * time.Millisecond)

	// Read output - this is the key test: PTY + background mode should preserve output
	readResult := tool.Execute(ctx, map[string]any{
		"action":    "read",
		"sessionId": runResp.SessionID,
	})
	require.False(t, readResult.IsError, "read should succeed: %s", readResult.ForLLM)
	require.Contains(t, readResult.ForLLM, "hello", "output should contain 'hello'")
}

func TestShellTool_PTY_Background_ReadNoBlock(t *testing.T) {
	if runtime.GOOS == "windows" {
		t.Skip("PTY not supported on Windows")
	}

	tool, err := NewExecTool("", false)
	require.NoError(t, err)

	sm := NewSessionManager()
	tool.sessionManager = sm

	ctx := WithToolContext(context.Background(), "cli", "test")

	// Start a long-running command with PTY + background mode
	// This command produces no output, just sleeps
	runResult := tool.Execute(ctx, map[string]any{
		"action":     "run",
		"command":    "sleep 10",
		"pty":        "true",
		"background": "true",
	})
	require.False(t, runResult.IsError, "run should succeed: %s", runResult.ForLLM)

	var runResp ExecResponse
	err = json.Unmarshal([]byte(runResult.ForLLM), &runResp)
	require.NoError(t, err)
	require.NotEmpty(t, runResp.SessionID)

	// Read immediately - should NOT block even though process is running and has no output
	// This tests that Read() returns quickly (within 1 second) instead of blocking for 10 seconds
	start := time.Now()
	readResult := tool.Execute(ctx, map[string]any{
		"action":    "read",
		"sessionId": runResp.SessionID,
	})
	elapsed := time.Since(start)

	require.False(t, readResult.IsError, "read should succeed: %s", readResult.ForLLM)
	require.Less(t, elapsed.Seconds(), 1.0, "read should not block, should return within 1 second")

	// Kill the session to clean up
	killResult := tool.Execute(ctx, map[string]any{
		"action":    "kill",
		"sessionId": runResp.SessionID,
	})
	require.False(t, killResult.IsError, "kill should succeed: %s", killResult.ForLLM)
}

func TestShellTool_Poll_Status(t *testing.T) {
	tool, err := NewExecTool("", false)
	require.NoError(t, err)

	sm := NewSessionManager()
	tool.sessionManager = sm

	ctx := WithToolContext(context.Background(), "cli", "test")

	runResult := tool.Execute(ctx, map[string]any{
		"action":     "run",
		"command":    "sleep 1",
		"background": "true",
	})
	require.False(t, runResult.IsError)

	var resp ExecResponse
	err = json.Unmarshal([]byte(runResult.ForLLM), &resp)
	require.NoError(t, err)

	pollResult := tool.Execute(ctx, map[string]any{
		"action":    "poll",
		"sessionId": resp.SessionID,
	})
	require.False(t, pollResult.IsError)

	var pollResp ExecResponse
	err = json.Unmarshal([]byte(pollResult.ForLLM), &pollResp)
	require.NoError(t, err)
	require.Equal(t, "running", pollResp.Status)

	time.Sleep(1200 * time.Millisecond)

	pollResult = tool.Execute(ctx, map[string]any{
		"action":    "poll",
		"sessionId": resp.SessionID,
	})
	require.False(t, pollResult.IsError)

	err = json.Unmarshal([]byte(pollResult.ForLLM), &pollResp)
	require.NoError(t, err)
	require.Equal(t, "done", pollResp.Status)
}

func TestShellTool_Action_Run_Sync(t *testing.T) {
	tool, err := NewExecTool("", false)
	require.NoError(t, err)

	ctx := context.Background()

	result := tool.Execute(ctx, map[string]any{
		"action":  "run",
		"command": "echo hello",
	})

	require.False(t, result.IsError)
	require.Contains(t, result.ForLLM, "hello")
}

// TestShellTool_Background_ReadAfterExit verifies that we can read
// buffered output even after the background process has exited.
func TestShellTool_Background_ReadAfterExit(t *testing.T) {
	tool, err := NewExecTool("", false)
	require.NoError(t, err)

	ctx := context.Background()

	// Start a background command that produces output and exits quickly
	runResult := tool.Execute(ctx, map[string]any{
		"action":     "run",
		"command":    "echo hello && sleep 1 && echo world",
		"background": "true",
	})
	require.False(t, runResult.IsError, "run should succeed: %s", runResult.ForUser)

	// Parse session ID from response
	var resp ExecResponse
	err = json.Unmarshal([]byte(runResult.ForLLM), &resp)
	require.NoError(t, err)
	require.NotEmpty(t, resp.SessionID)
	sessionID := resp.SessionID

	// Wait for process to exit (sleep 1 + some buffer)
	time.Sleep(1500 * time.Millisecond)

	// Poll to verify process is done
	pollResult := tool.Execute(ctx, map[string]any{
		"action":    "poll",
		"sessionId": sessionID,
	})
	require.False(t, pollResult.IsError, "poll should succeed: %s", pollResult.ForLLM)
	var pollResp ExecResponse
	err = json.Unmarshal([]byte(pollResult.ForLLM), &pollResp)
	require.NoError(t, err)
	require.Equal(t, "done", pollResp.Status, "process should be done")

	// Try to read output AFTER process has exited
	readResult := tool.Execute(ctx, map[string]any{
		"action":    "read",
		"sessionId": sessionID,
	})
	require.False(t, readResult.IsError, "read should succeed after exit: %s", readResult.ForLLM)

	var readResp ExecResponse
	err = json.Unmarshal([]byte(readResult.ForLLM), &readResp)
	require.NoError(t, err)

	// Output should contain both "hello" and "world"
	require.Contains(t, readResp.Output, "hello", "should contain hello")
	require.Contains(t, readResp.Output, "world", "should contain world after sleep")
}

func TestSendKeys_CtrlC(t *testing.T) {
	// Note: Ctrl-C as a signal requires sending SIGINT to the process group,
	// which requires elevated privileges. Writing "\x03" to PTY passes the byte
	// to the process but doesn't generate SIGINT for processes that don't read stdin.
	// For interrupting processes, use the kill action instead.
	t.Skip("Ctrl-C as signal not supported - use kill action for interruption")
}

func TestEncodeKeyToken(t *testing.T) {
	tests := []struct {
		token    string
		expected string
		hasError bool
	}{
		// Named keys
		{"enter", "\r", false},
		{"return", "\r", false},
		{"tab", "\t", false},
		{"escape", "\x1b", false},
		{"esc", "\x1b", false},
		{"backspace", "\x7f", false},
		{"up", "\x1b[A", false},
		{"down", "\x1b[B", false},
		{"left", "\x1b[D", false},
		{"right", "\x1b[C", false},
		{"home", "\x1b[1~", false},
		{"end", "\x1b[4~", false},
		{"pageup", "\x1b[5~", false},
		{"pagedown", "\x1b[6~", false},
		{"delete", "\x1b[3~", false},
		{"f1", "\x1bOP", false},
		{"f12", "\x1b[24~", false},

		// Ctrl keys
		{"ctrl-c", "\x03", false},
		{"ctrl-d", "\x04", false},
		{"ctrl-a", "\x01", false},
		{"ctrl-z", "\x1a", false},
		{"c-c", "\x03", false},
		{"c-d", "\x04", false},

		// Alt keys
		{"alt-x", "\x1bx", false},
		{"m-x", "\x1bx", false},

		// Case insensitive tests
		{"ENTER", "\r", false},
		{"TAB", "\t", false},
		{"CTRL-C", "\x03", false},
		{"Ctrl-D", "\x04", false},
		{"ALT-X", "\x1bx", false},
		{"M-X", "\x1bx", false},
		{"UP", "\x1b[A", false},
		{"DOWN", "\x1b[B", false},

		// Unknown keys should return error (use write action for text input)
		{"unknown-key", "", true},
	}

	for _, tt := range tests {
		t.Run(tt.token, func(t *testing.T) {
			result, err := encodeKeyToken(tt.token, PtyKeyModeCSI)
			if tt.hasError {
				require.Error(t, err, "expected error for %s", tt.token)
			} else {
				require.NoError(t, err, "unexpected error for %s", tt.token)
				require.Equal(t, tt.expected, result, "wrong encoding for %s", tt.token)
			}
		})
	}
}

// TestDetectPtyKeyMode tests smkx/rmkx detection in PTY output
func TestDetectPtyKeyMode(t *testing.T) {
	tests := []struct {
		name     string
		raw      string
		expected PtyKeyMode
	}{
		{"no toggle", "hello world", PtyKeyModeNotFound},
		{"smkx only", "\x1b[?1h\x1b=", PtyKeyModeSS3},
		{"rmkx only", "\x1b[?1l\x1b>", PtyKeyModeCSI},
		{"both smkx first", "\x1b[?1h\x1b=...\x1b[?1l\x1b>", PtyKeyModeCSI},
		{"both rmkx first", "\x1b[?1l\x1b>...\x1b[?1h\x1b=", PtyKeyModeSS3},
		{"multiple toggles smkx last", "\x1b[?1h\x1b=...\x1b[?1l\x1b>...\x1b[?1h\x1b=", PtyKeyModeSS3},
		{"multiple toggles rmkx last", "\x1b[?1l\x1b>...\x1b[?1h\x1b=...\x1b[?1l\x1b>", PtyKeyModeCSI},
		{"partial smkx", "\x1b[?1h", PtyKeyModeSS3},
		{"partial rmkx", "\x1b[?1l", PtyKeyModeCSI},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			result := detectPtyKeyMode(tt.raw)
			require.Equal(t, tt.expected, result, "wrong mode for %s", tt.name)
		})
	}
}

func TestEncodeKeyTokenWithPtyKeyMode(t *testing.T) {
	tests := []struct {
		name     string
		token    string
		mode     PtyKeyMode
		expected string
		hasError bool
	}{
		// CSI mode
		{"up csi", "up", PtyKeyModeCSI, "\x1b[A", false},
		{"down csi", "down", PtyKeyModeCSI, "\x1b[B", false},
		{"left csi", "left", PtyKeyModeCSI, "\x1b[D", false},
		{"right csi", "right", PtyKeyModeCSI, "\x1b[C", false},

		// SS3 mode
		{"up ss3", "up", PtyKeyModeSS3, "\x1bOA", false},
		{"down ss3", "down", PtyKeyModeSS3, "\x1bOB", false},
		{"left ss3", "left", PtyKeyModeSS3, "\x1bOD", false},
		{"right ss3", "right", PtyKeyModeSS3, "\x1bOC", false},
		{"home ss3", "home", PtyKeyModeSS3, "\x1bOH", false},
		{"end ss3", "end", PtyKeyModeSS3, "\x1bOF", false},

		// Other keys unaffected by mode
		{"enter ss3", "enter", PtyKeyModeSS3, "\r", false},
		{"tab ss3", "tab", PtyKeyModeSS3, "\t", false},
		{"ctrl-c ss3", "ctrl-c", PtyKeyModeSS3, "\x03", false},

		// NotFound behaves like CSI
		{"up notfound", "up", PtyKeyModeNotFound, "\x1b[A", false},
		{"down notfound", "down", PtyKeyModeNotFound, "\x1b[B", false},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			result, err := encodeKeyToken(tt.token, tt.mode)
			if tt.hasError {
				require.Error(t, err, "expected error for %s", tt.name)
			} else {
				require.NoError(t, err, "unexpected error for %s", tt.name)
				require.Equal(t, tt.expected, result, "wrong encoding for %s", tt.name)
			}
		})
	}
}