package main

import (
	"context"
	"encoding/json"
	"fmt"
	"hash/crc32"
	"os"
	"os/signal"
	"strings"
	"sync"
	"syscall"

	"github.com/godbus/dbus/v5"
	"github.com/godbus/dbus/v5/introspect"

	"ollie/pkg/agent"
	"ollie/pkg/backend"
	"ollie/pkg/config"
	"ollie/pkg/env"
	"ollie/pkg/paths"
	"ollie/pkg/tools"
	"ollie/pkg/tools/execute"
)

const (
	busName   = "org.ollie.SessionManager"
	busPath   = "/org/ollie/SessionManager"
	busIface  = "org.ollie.SessionManager"
)

// managedSession wraps a Core with its context and metadata.
type managedSession struct {
	core   agent.Core
	ctx    context.Context
	cancel context.CancelFunc
	id     string
	agent  string
	log    []byte
	logMu  sync.Mutex
	peers  map[string]bool
}

// SessionManager is the D-Bus exported object.
type SessionManager struct {
	mu       sync.RWMutex
	sessions map[string]*managedSession
	conn     *dbus.Conn
}

func NewSessionManager(conn *dbus.Conn) *SessionManager {
	env.EnsureDefaults()
	return &SessionManager{
		sessions: make(map[string]*managedSession),
		conn:     conn,
	}
}

// --- Session lifecycle ---

func (m *SessionManager) CreateSession(cwd, backendName, modelName, agentName string) (string, *dbus.Error) {
	if cwd == "" {
		cwd, _ = os.Getwd()
	}
	cwd = paths.ExpandHome(os.ExpandEnv(cwd))

	if agentName == "" {
		agentName = "default"
		if v := os.Getenv("OLLIE_DEFAULT_AGENT"); v != "" {
			agentName = v
		}
	}

	sessID := agent.NewSessionID()

	// Load agent config
	agentsDir := paths.CfgDir() + "/agents"
	var cfg *config.Config
	cfgPath := agent.AgentConfigPath(agentsDir, agentName)
	if f, err := os.Open(cfgPath); err == nil {
		cfg, _ = config.Load(f)
		f.Close()
	}

	// Resolve backend
	if backendName == "" && cfg != nil && cfg.Backend != "" {
		backendName = cfg.Backend
	}
	be, err := backend.NewWithName(backendName)
	if err != nil {
		return "", dbus.MakeFailedError(fmt.Errorf("backend: %w", err))
	}

	// Resolve model
	if modelName == "" && cfg != nil && cfg.Model != "" {
		modelName = cfg.Model
	}
	if modelName == "" {
		modelName = os.Getenv("OLLIE_MODEL")
	}
	if modelName != "" {
		be.SetModel(modelName)
	}

	// Sessions dir
	sessionsDir := paths.DataDir() + "/sessions"
	os.MkdirAll(sessionsDir, 0700)

	// Build dispatcher + runtime
	newDisp := tools.NewDispatcherFunc(map[string]func() tools.Server{
		"execute": execute.Decl(cwd),
	})
	rt := agent.BuildRuntime(cfg, newDisp(), cwd, []string{"OLLIE_SESSION_ID=" + sessID})

	// Create the agent core
	core := agent.NewAgentCore(agent.AgentCoreConfig{
		Backend:       be,
		AgentName:     agentName,
		AgentsDir:     agentsDir,
		SessionsDir:   sessionsDir,
		SessionID:     sessID,
		CWD:           cwd,
		Runtime:       rt,
		NewDispatcher: newDisp,
	})

	ctx, cancel := context.WithCancel(context.Background())
	sess := &managedSession{
		core:   core,
		ctx:    ctx,
		cancel: cancel,
		id:     sessID,
		agent:  agentName,
	}

	// Subscribe to events for the chat log + signal dispatch
	streamingRole := ""
	core.Bus().Subscribe("event", func(ev agent.Event) {
		var text string
		switch ev.Role {
		case "assistant", "reasoning":
			if streamingRole != ev.Role {
				if streamingRole != "" {
					text += "\n\n"
				}
				text += "[" + ev.Role + "]\n"
				streamingRole = ev.Role
			}
			text += ev.Content
		default:
			if ev.Role == "usage" {
				return
			}
			if streamingRole != "" {
				text += "\n\n"
				streamingRole = ""
			}
			switch ev.Role {
			case "user":
				text += "[user]\n" + ev.Content + "\n\n"
			case "call":
				text += "[call:" + ev.Name + "]\n" + ev.Content + "\n\n"
			case "tool":
				text += "[tool:" + ev.Name + "]\n" + ev.Content + "\n\n"
			case "error":
				text += "[error]\n" + ev.Content + "\n\n"
			case "info":
				text += "[info] " + ev.Content + "\n\n"
			default:
				text += "[" + ev.Role + "]\n" + ev.Content + "\n\n"
			}
		}
		if text == "" {
			return
		}

		sess.logMu.Lock()
		offset := int64(len(sess.log))
		sess.log = append(sess.log, []byte(text)...)
		sess.logMu.Unlock()

		m.conn.Emit(busPath, busIface+".ChatUpdated", sess.id, offset, text)
	})

	// Watch state changes
	go func() {
		current := "idle"
		for {
			next, ok := core.WaitChange(ctx, agent.WatchState, current)
			if !ok {
				return
			}
			current = next
			m.conn.Emit(busPath, busIface+".StateChanged", sess.id, current)

			// Send notification when a turn completes
			if current == "idle" {
				m.sendNotification("Ollie", "Session "+sess.id+" finished")
			}
		}
	}()

	m.mu.Lock()
	m.sessions[sessID] = sess
	m.mu.Unlock()

	m.conn.Emit(busPath, busIface+".SessionCreated", sessID)
	return sessID, nil
}

func (m *SessionManager) ListSessions() ([]string, *dbus.Error) {
	m.mu.RLock()
	defer m.mu.RUnlock()

	result := make([]string, 0, len(m.sessions))
	for id, sess := range m.sessions {
		result = append(result, fmt.Sprintf("%s\t%s\t%s\t%s",
			id, sess.core.State(), sess.core.ModelName(), sess.agent))
	}
	return result, nil
}

func (m *SessionManager) KillSession(sessionID string) (bool, *dbus.Error) {
	m.mu.Lock()
	sess, ok := m.sessions[sessionID]
	if !ok {
		m.mu.Unlock()
		return false, nil
	}
	delete(m.sessions, sessionID)
	m.mu.Unlock()

	sess.core.Interrupt(agent.ErrInterrupted)
	sess.core.Close()
	sess.cancel()

	m.conn.Emit(busPath, busIface+".SessionKilled", sessionID)
	return true, nil
}

func (m *SessionManager) RenameSession(sessionID, newName string) (bool, *dbus.Error) {
	m.mu.Lock()
	sess, ok := m.sessions[sessionID]
	if !ok {
		m.mu.Unlock()
		return false, nil
	}
	delete(m.sessions, sessionID)
	sess.id = newName
	m.sessions[newName] = sess
	m.mu.Unlock()

	if err := sess.core.SetSessionID(newName); err != nil {
		m.mu.Lock()
		delete(m.sessions, newName)
		sess.id = sessionID
		m.sessions[sessionID] = sess
		m.mu.Unlock()
		return false, nil
	}
	m.conn.Emit(busPath, busIface+".SessionRenamed", sessionID, newName)
	return true, nil
}

// --- Interaction ---

func (m *SessionManager) Submit(sessionID, prompt string) (bool, *dbus.Error) {
	m.mu.RLock()
	sess, ok := m.sessions[sessionID]
	m.mu.RUnlock()
	if !ok {
		return false, nil
	}

	go sess.core.Submit(sess.ctx, prompt)
	return true, nil
}

func (m *SessionManager) Interrupt(sessionID string) (bool, *dbus.Error) {
	m.mu.RLock()
	sess, ok := m.sessions[sessionID]
	m.mu.RUnlock()
	if !ok {
		return false, nil
	}

	sess.core.Interrupt(agent.ErrInterrupted)
	return true, nil
}

// --- State queries ---

func (m *SessionManager) GetState(sessionID string) (string, *dbus.Error) {
	m.mu.RLock()
	sess, ok := m.sessions[sessionID]
	m.mu.RUnlock()
	if !ok {
		return "", nil
	}
	return sess.core.State(), nil
}

func (m *SessionManager) GetChat(sessionID string, offset int64) (string, int64, *dbus.Error) {
	m.mu.RLock()
	sess, ok := m.sessions[sessionID]
	m.mu.RUnlock()
	if !ok {
		return "", offset, nil
	}

	sess.logMu.Lock()
	if offset < 0 {
		offset = 0
	}
	if offset > int64(len(sess.log)) {
		offset = int64(len(sess.log))
	}
	text := string(sess.log[offset:])
	newOffset := int64(len(sess.log))
	sess.logMu.Unlock()

	return text, newOffset, nil
}

func (m *SessionManager) GetUsage(sessionID string) (string, *dbus.Error) {
	m.mu.RLock()
	sess, ok := m.sessions[sessionID]
	m.mu.RUnlock()
	if !ok {
		return "", nil
	}
	return sess.core.Usage(), nil
}

func (m *SessionManager) GetCost(sessionID string) (string, *dbus.Error) {
	m.mu.RLock()
	sess, ok := m.sessions[sessionID]
	m.mu.RUnlock()
	if !ok {
		return "", nil
	}
	return sess.core.Cost(), nil
}

// --- Config ---

func (m *SessionManager) GetConfig(sessionID string) (string, *dbus.Error) {
	m.mu.RLock()
	sess, ok := m.sessions[sessionID]
	m.mu.RUnlock()
	if !ok {
		return "", nil
	}

	var result string
	result += "model=" + sess.core.ModelName() + "\n"
	result += "backend=" + sess.core.BackendName() + "\n"
	result += "agent=" + sess.agent + "\n"
	result += "cwd=" + sess.core.CWD() + "\n"
	result += "state=" + sess.core.State() + "\n"
	return result, nil
}

func (m *SessionManager) SetConfig(sessionID, key, value string) (bool, *dbus.Error) {
	m.mu.RLock()
	sess, ok := m.sessions[sessionID]
	m.mu.RUnlock()
	if !ok {
		return false, nil
	}

	switch key {
	case "model":
		sess.core.Submit(sess.ctx, "/model "+value)
	case "cwd":
		if err := sess.core.SetCWD(value); err != nil {
			return false, nil
		}
	default:
		return false, nil
	}
	return true, nil
}

// --- Context ---

func (m *SessionManager) GetContext(sessionID string) (string, *dbus.Error) {
	m.mu.RLock()
	sess, ok := m.sessions[sessionID]
	m.mu.RUnlock()
	if !ok {
		return "", nil
	}

	msgs := sess.core.Context()
	var result string
	for _, msg := range msgs {
		data, err := json.Marshal(msg)
		if err != nil {
			continue
		}
		result += string(data) + "\n"
	}
	return result, nil
}

// --- Backends/models/agents ---

func (m *SessionManager) ListBackends() ([]string, *dbus.Error) {
	return []string{"ollama", "openai", "openrouter", "anthropic", "copilot", "kiro", "gemini"}, nil
}

func (m *SessionManager) ListModels(sessionID string) ([]string, *dbus.Error) {
	m.mu.RLock()
	sess, ok := m.sessions[sessionID]
	m.mu.RUnlock()
	if !ok {
		return nil, nil
	}

	raw := sess.core.ListModels()
	models := strings.Split(strings.TrimSpace(raw), "\n")
	if len(models) == 1 && models[0] == "" {
		return nil, nil
	}
	return models, nil
}

func (m *SessionManager) ListAgents() ([]string, *dbus.Error) {
	var result []string
	for _, dir := range agent.AgentsDirs() {
		entries, err := os.ReadDir(dir)
		if err != nil {
			continue
		}
		for _, e := range entries {
			name := e.Name()
			if strings.HasSuffix(name, ".json") {
				result = append(result, strings.TrimSuffix(name, ".json"))
			}
		}
	}
	return result, nil
}

// --- Peers ---

func (m *SessionManager) PeerAdd(sessionID, peerID string) (bool, *dbus.Error) {
	m.mu.RLock()
	_, ok := m.sessions[sessionID]
	_, peerOk := m.sessions[peerID]
	m.mu.RUnlock()
	if !ok || !peerOk {
		return false, nil
	}

	m.mu.Lock()
	sess := m.sessions[sessionID]
	if sess.peers == nil {
		sess.peers = make(map[string]bool)
	}
	sess.peers[peerID] = true
	m.mu.Unlock()
	return true, nil
}

func (m *SessionManager) PeerRemove(sessionID, peerID string) (bool, *dbus.Error) {
	m.mu.Lock()
	sess, ok := m.sessions[sessionID]
	if !ok {
		m.mu.Unlock()
		return false, nil
	}
	delete(sess.peers, peerID)
	m.mu.Unlock()
	return true, nil
}

func (m *SessionManager) PeerList(sessionID string) ([]string, *dbus.Error) {
	m.mu.RLock()
	sess, ok := m.sessions[sessionID]
	m.mu.RUnlock()
	if !ok {
		return nil, nil
	}

	var result []string
	for peerID := range sess.peers {
		result = append(result, peerID)
	}
	return result, nil
}

func (m *SessionManager) PeerSubmit(sessionID, peerID, prompt string) (bool, *dbus.Error) {
	m.mu.RLock()
	sess, ok := m.sessions[sessionID]
	peer, peerOk := m.sessions[peerID]
	m.mu.RUnlock()
	if !ok || !peerOk {
		return false, nil
	}

	if !sess.peers[peerID] {
		return false, nil
	}

	go peer.core.Submit(peer.ctx, prompt)
	return true, nil
}

// --- Notifications ---

func (m *SessionManager) sendNotification(title, body string) {
	obj := m.conn.Object("org.freedesktop.Notifications", "/org/freedesktop/Notifications")
	obj.Call("org.freedesktop.Notifications.Notify", 0,
		"ollie-dbus",      // app_name
		uint32(0),         // replaces_id
		"system-run",      // app_icon
		title,             // summary
		body,              // body
		[]string{},        // actions
		map[string]dbus.Variant{}, // hints
		int32(5000),       // timeout ms
	)
}

// --- Shutdown ---

// --- Completion ---

// Complete performs a single-shot code completion using a dedicated copilot session.
// It takes context about the cursor position and returns raw completion text.
func (m *SessionManager) Complete(cwd, filePath, prefix, suffix, extraContext string) (string, *dbus.Error) {
	if cwd == "" {
		cwd, _ = os.Getwd()
	}
	cwd = paths.ExpandHome(os.ExpandEnv(cwd))

	model := os.Getenv("OLLIE_COMPLETE_MODEL")
	backendName := os.Getenv("OLLIE_COMPLETE_BACKEND")
	if model == "" || backendName == "" {
		return "", dbus.MakeFailedError(fmt.Errorf("OLLIE_COMPLETE_MODEL and OLLIE_COMPLETE_BACKEND must be set"))
	}

	// Truncate to context budget
	const prefixMax = 12000
	const suffixMax = 1000
	if len(prefix) > prefixMax {
		prefix = prefix[len(prefix)-prefixMax:]
	}
	if len(suffix) > suffixMax {
		suffix = suffix[:suffixMax]
	}

	// Find or create a copilot session keyed by cwd
	sessID := m.findOrCreateCopilot(cwd, backendName, model)
	if sessID == "" {
		return "", dbus.MakeFailedError(fmt.Errorf("failed to create copilot session"))
	}

	m.mu.RLock()
	sess, ok := m.sessions[sessID]
	m.mu.RUnlock()
	if !ok {
		return "", dbus.MakeFailedError(fmt.Errorf("copilot session disappeared"))
	}

	// Build FIM prompt
	fileHint := ""
	if filePath != "" {
		fileHint = " in " + filePath
	}
	contextBlock := ""
	if extraContext != "" {
		contextBlock = "\n" + extraContext
	}
	prompt := fmt.Sprintf(`Implement the code at the cursor%s. The prefix ends at the point where new code is needed. Write the implementation — do not echo stubs, TODOs, or placeholder returns from the prefix. Output ONLY raw code. No reasoning, no shell commands, no explanations, no markdown fences, no backticks, no preamble. Your entire response must be valid code that can be inserted directly into the file.
%s
<prefix>
%s
</prefix>
<suffix>
%s
</suffix>`, fileHint, contextBlock, prefix, suffix)

	// Submit and wait for completion
	sess.core.Submit(sess.ctx, "/clear")
	sess.core.Submit(sess.ctx, prompt)

	// Wait for idle
	for {
		state := sess.core.State()
		if state == "idle" {
			break
		}
		next, ok := sess.core.WaitChange(sess.ctx, agent.WatchState, state)
		if !ok {
			return "", dbus.MakeFailedError(fmt.Errorf("copilot session cancelled"))
		}
		if next == "idle" {
			break
		}
	}

	result := sess.core.Reply()

	// Strip markdown fences and leaked XML tags
	result = stripCompletionNoise(result)

	// Strip prefix echo
	result = stripPrefixEcho(prefix, result)

	return result, nil
}

// findOrCreateCopilot finds an existing copilot session for cwd or creates one.
func (m *SessionManager) findOrCreateCopilot(cwd, backendName, modelName string) string {
	// Session ID is deterministic based on cwd
	sessID := fmt.Sprintf("%d-copilot", crc32Str(cwd))

	m.mu.RLock()
	_, exists := m.sessions[sessID]
	m.mu.RUnlock()

	if exists {
		return sessID
	}

	// Create a new copilot session
	agentsDir := paths.CfgDir() + "/agents"
	var cfg *config.Config
	cfgPath := agent.AgentConfigPath(agentsDir, "copilot")
	if f, err := os.Open(cfgPath); err == nil {
		cfg, _ = config.Load(f)
		f.Close()
	}

	be, err := backend.NewWithName(backendName)
	if err != nil {
		return ""
	}
	be.SetModel(modelName)

	sessionsDir := paths.DataDir() + "/sessions"
	os.MkdirAll(sessionsDir, 0700)

	newDisp := tools.NewDispatcherFunc(map[string]func() tools.Server{
		"execute": execute.Decl(cwd),
	})
	rt := agent.BuildRuntime(cfg, newDisp(), cwd, []string{"OLLIE_SESSION_ID=" + sessID})

	core := agent.NewAgentCore(agent.AgentCoreConfig{
		Backend:       be,
		AgentName:     "copilot",
		AgentsDir:     agentsDir,
		SessionsDir:   sessionsDir,
		SessionID:     sessID,
		CWD:           cwd,
		Runtime:       rt,
		NewDispatcher: newDisp,
	})

	ctx, cancel := context.WithCancel(context.Background())
	sess := &managedSession{
		core:   core,
		ctx:    ctx,
		cancel: cancel,
		id:     sessID,
		agent:  "copilot",
	}

	m.mu.Lock()
	// Double-check after lock
	if _, exists := m.sessions[sessID]; exists {
		m.mu.Unlock()
		core.Close()
		cancel()
		return sessID
	}
	m.sessions[sessID] = sess
	m.mu.Unlock()

	return sessID
}

// stripCompletionNoise removes markdown fences and leaked XML tags.
func stripCompletionNoise(s string) string {
	var lines []string
	for _, line := range strings.Split(s, "\n") {
		trimmed := strings.TrimSpace(line)
		// Skip markdown code fences
		if strings.HasPrefix(trimmed, "```") {
			continue
		}
		// Skip leaked XML tags
		if trimmed == "<prefix>" || trimmed == "</prefix>" ||
			trimmed == "<suffix>" || trimmed == "</suffix>" {
			continue
		}
		// Skip info lines
		if strings.HasPrefix(trimmed, ":: ") {
			continue
		}
		lines = append(lines, line)
	}
	return strings.Join(lines, "\n")
}

// stripPrefixEcho removes echoed prefix from the beginning of the result.
func stripPrefixEcho(prefix, result string) string {
	tailMax := 200
	if len(prefix) < tailMax {
		tailMax = len(prefix)
	}
	for i := tailMax; i > 0; i-- {
		tail := prefix[len(prefix)-i:]
		if strings.HasPrefix(result, tail) {
			return result[len(tail):]
		}
	}
	return result
}

// crc32Str returns a CRC32 checksum of a string as uint32.
func crc32Str(s string) uint32 {
	return crc32.ChecksumIEEE([]byte(s))
}

func (m *SessionManager) Shutdown() {
	m.mu.Lock()
	for id, sess := range m.sessions {
		sess.core.Interrupt(agent.ErrInterrupted)
		sess.core.Close()
		sess.cancel()
		delete(m.sessions, id)
	}
	m.mu.Unlock()
}

// --- Introspection XML ---

const introspectXML = `<node>
  <interface name="org.ollie.SessionManager">
    <method name="CreateSession">
      <arg name="cwd" type="s" direction="in"/>
      <arg name="backend" type="s" direction="in"/>
      <arg name="model" type="s" direction="in"/>
      <arg name="agent" type="s" direction="in"/>
      <arg name="session_id" type="s" direction="out"/>
    </method>
    <method name="ListSessions">
      <arg name="sessions" type="as" direction="out"/>
    </method>
    <method name="KillSession">
      <arg name="session_id" type="s" direction="in"/>
      <arg name="success" type="b" direction="out"/>
    </method>
    <method name="RenameSession">
      <arg name="session_id" type="s" direction="in"/>
      <arg name="new_name" type="s" direction="in"/>
      <arg name="success" type="b" direction="out"/>
    </method>
    <method name="Submit">
      <arg name="session_id" type="s" direction="in"/>
      <arg name="prompt" type="s" direction="in"/>
      <arg name="success" type="b" direction="out"/>
    </method>
    <method name="Interrupt">
      <arg name="session_id" type="s" direction="in"/>
      <arg name="success" type="b" direction="out"/>
    </method>
    <method name="GetState">
      <arg name="session_id" type="s" direction="in"/>
      <arg name="state" type="s" direction="out"/>
    </method>
    <method name="GetChat">
      <arg name="session_id" type="s" direction="in"/>
      <arg name="offset" type="x" direction="in"/>
      <arg name="text" type="s" direction="out"/>
      <arg name="new_offset" type="x" direction="out"/>
    </method>
    <method name="GetUsage">
      <arg name="session_id" type="s" direction="in"/>
      <arg name="usage" type="s" direction="out"/>
    </method>
    <method name="GetCost">
      <arg name="session_id" type="s" direction="in"/>
      <arg name="cost" type="s" direction="out"/>
    </method>
    <method name="GetConfig">
      <arg name="session_id" type="s" direction="in"/>
      <arg name="config" type="s" direction="out"/>
    </method>
    <method name="SetConfig">
      <arg name="session_id" type="s" direction="in"/>
      <arg name="key" type="s" direction="in"/>
      <arg name="value" type="s" direction="in"/>
      <arg name="success" type="b" direction="out"/>
    </method>
    <method name="GetContext">
      <arg name="session_id" type="s" direction="in"/>
      <arg name="context" type="s" direction="out"/>
    </method>
    <method name="ListBackends">
      <arg name="backends" type="as" direction="out"/>
    </method>
    <method name="ListModels">
      <arg name="session_id" type="s" direction="in"/>
      <arg name="models" type="as" direction="out"/>
    </method>
    <method name="ListAgents">
      <arg name="agents" type="as" direction="out"/>
    </method>
    <method name="PeerAdd">
      <arg name="session_id" type="s" direction="in"/>
      <arg name="peer_id" type="s" direction="in"/>
      <arg name="success" type="b" direction="out"/>
    </method>
    <method name="PeerRemove">
      <arg name="session_id" type="s" direction="in"/>
      <arg name="peer_id" type="s" direction="in"/>
      <arg name="success" type="b" direction="out"/>
    </method>
    <method name="PeerList">
      <arg name="session_id" type="s" direction="in"/>
      <arg name="peers" type="as" direction="out"/>
    </method>
    <method name="PeerSubmit">
      <arg name="session_id" type="s" direction="in"/>
      <arg name="peer_id" type="s" direction="in"/>
      <arg name="prompt" type="s" direction="in"/>
      <arg name="success" type="b" direction="out"/>
    </method>
    <method name="Complete">
      <arg name="cwd" type="s" direction="in"/>
      <arg name="file" type="s" direction="in"/>
      <arg name="prefix" type="s" direction="in"/>
      <arg name="suffix" type="s" direction="in"/>
      <arg name="context" type="s" direction="in"/>
      <arg name="result" type="s" direction="out"/>
    </method>
    <signal name="SessionCreated">
      <arg name="session_id" type="s"/>
    </signal>
    <signal name="SessionKilled">
      <arg name="session_id" type="s"/>
    </signal>
    <signal name="SessionRenamed">
      <arg name="old_id" type="s"/>
      <arg name="new_id" type="s"/>
    </signal>
    <signal name="StateChanged">
      <arg name="session_id" type="s"/>
      <arg name="new_state" type="s"/>
    </signal>
    <signal name="ChatUpdated">
      <arg name="session_id" type="s"/>
      <arg name="offset" type="x"/>
      <arg name="new_text" type="s"/>
    </signal>
  </interface>
  ` + introspect.IntrospectDataString + `
</node>`

func main() {
	conn, err := dbus.ConnectSessionBus()
	if err != nil {
		fmt.Fprintf(os.Stderr, "cannot connect to session bus: %v\n", err)
		os.Exit(1)
	}
	defer conn.Close()

	reply, err := conn.RequestName(busName, dbus.NameFlagDoNotQueue)
	if err != nil || reply != dbus.RequestNameReplyPrimaryOwner {
		fmt.Fprintf(os.Stderr, "cannot acquire bus name %s: %v\n", busName, err)
		os.Exit(1)
	}

	mgr := NewSessionManager(conn)

	conn.Export(mgr, busPath, busIface)
	conn.Export(introspect.Introspectable(introspectXML), busPath,
		"org.freedesktop.DBus.Introspectable")

	fmt.Println("ollie-dbus daemon started on D-Bus:", busName)

	// Wait for signal
	sigCh := make(chan os.Signal, 1)
	signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM)
	<-sigCh

	fmt.Println("ollie-dbus daemon shutting down")
	mgr.Shutdown()
}