1package app
2
3import (
4 "context"
5 "database/sql"
6 "errors"
7 "fmt"
8 "log/slog"
9 "sync"
10 "time"
11
12 tea "github.com/charmbracelet/bubbletea/v2"
13 "github.com/charmbracelet/crush/internal/agent"
14 "github.com/charmbracelet/crush/internal/agent/tools"
15 "github.com/charmbracelet/crush/internal/config"
16 "github.com/charmbracelet/crush/internal/csync"
17 "github.com/charmbracelet/crush/internal/db"
18 "github.com/charmbracelet/crush/internal/format"
19 "github.com/charmbracelet/crush/internal/history"
20 "github.com/charmbracelet/crush/internal/log"
21 "github.com/charmbracelet/crush/internal/pubsub"
22 "github.com/charmbracelet/fantasy/ai"
23
24 "github.com/charmbracelet/crush/internal/lsp"
25 "github.com/charmbracelet/crush/internal/message"
26 "github.com/charmbracelet/crush/internal/permission"
27 "github.com/charmbracelet/crush/internal/session"
28)
29
30type App struct {
31 Sessions session.Service
32 Messages message.Service
33 History history.Service
34 Permissions permission.Service
35
36 // TODO: (kujtim) remove this when fully implemented
37 AgentCoordinator agent.Coordinator
38
39 LSPClients *csync.Map[string, *lsp.Client]
40
41 config *config.Config
42
43 serviceEventsWG *sync.WaitGroup
44 eventsCtx context.Context
45 events chan tea.Msg
46 tuiWG *sync.WaitGroup
47
48 // global context and cleanup functions
49 globalCtx context.Context
50 cleanupFuncs []func() error
51}
52
53// New initializes a new applcation instance.
54func New(ctx context.Context, conn *sql.DB, cfg *config.Config) (*App, error) {
55 q := db.New(conn)
56 sessions := session.NewService(q)
57 messages := message.NewService(q)
58 files := history.NewService(q, conn)
59 skipPermissionsRequests := cfg.Permissions != nil && cfg.Permissions.SkipRequests
60 allowedTools := []string{}
61 if cfg.Permissions != nil && cfg.Permissions.AllowedTools != nil {
62 allowedTools = cfg.Permissions.AllowedTools
63 }
64
65 app := &App{
66 Sessions: sessions,
67 Messages: messages,
68 History: files,
69 Permissions: permission.NewPermissionService(cfg.WorkingDir(), skipPermissionsRequests, allowedTools),
70 LSPClients: csync.NewMap[string, *lsp.Client](),
71
72 globalCtx: ctx,
73
74 config: cfg,
75
76 events: make(chan tea.Msg, 100),
77 serviceEventsWG: &sync.WaitGroup{},
78 tuiWG: &sync.WaitGroup{},
79 }
80
81 app.setupEvents()
82
83 // Initialize LSP clients in the background.
84 app.initLSPClients(ctx)
85
86 // cleanup database upon app shutdown
87 app.cleanupFuncs = append(app.cleanupFuncs, conn.Close)
88
89 // TODO: remove the concept of agent config, most likely.
90 if cfg.IsConfigured() {
91 if err := app.InitCoderAgent(); err != nil {
92 return nil, fmt.Errorf("failed to initialize coder agent: %w", err)
93 }
94 } else {
95 slog.Warn("No agent configuration found")
96 }
97 return app, nil
98}
99
100// Config returns the application configuration.
101func (app *App) Config() *config.Config {
102 return app.config
103}
104
105// RunNonInteractive handles the execution flow when a prompt is provided via
106// CLI flag.
107func (app *App) RunNonInteractive(ctx context.Context, prompt string, quiet bool) error {
108 slog.Info("Running in non-interactive mode")
109
110 ctx, cancel := context.WithCancel(ctx)
111 defer cancel()
112
113 // Start spinner if not in quiet mode.
114 var spinner *format.Spinner
115 if !quiet {
116 spinner = format.NewSpinner(ctx, cancel, "Generating")
117 spinner.Start()
118 }
119
120 // Helper function to stop spinner once.
121 stopSpinner := func() {
122 if !quiet && spinner != nil {
123 spinner.Stop()
124 spinner = nil
125 }
126 }
127 defer stopSpinner()
128
129 const maxPromptLengthForTitle = 100
130 titlePrefix := "Non-interactive: "
131 var titleSuffix string
132
133 if len(prompt) > maxPromptLengthForTitle {
134 titleSuffix = prompt[:maxPromptLengthForTitle] + "..."
135 } else {
136 titleSuffix = prompt
137 }
138 title := titlePrefix + titleSuffix
139
140 sess, err := app.Sessions.Create(ctx, title)
141 if err != nil {
142 return fmt.Errorf("failed to create session for non-interactive mode: %w", err)
143 }
144 slog.Info("Created session for non-interactive run", "session_id", sess.ID)
145
146 // Automatically approve all permission requests for this non-interactive session
147 app.Permissions.AutoApproveSession(sess.ID)
148
149 type response struct {
150 result *ai.AgentResult
151 err error
152 }
153 done := make(chan response, 1)
154
155 go func(ctx context.Context, sessionID, prompt string) {
156 result, err := app.AgentCoordinator.Run(ctx, sess.ID, prompt)
157 if err != nil {
158 done <- response{
159 err: fmt.Errorf("failed to start agent processing stream: %w", err),
160 }
161 }
162 done <- response{
163 result: result,
164 }
165 }(ctx, sess.ID, prompt)
166
167 messageEvents := app.Messages.Subscribe(ctx)
168 messageReadBytes := make(map[string]int)
169
170 for {
171 select {
172 case result := <-done:
173 stopSpinner()
174 if result.err != nil {
175 if errors.Is(result.err, context.Canceled) || errors.Is(result.err, agent.ErrRequestCancelled) {
176 slog.Info("Non-interactive: agent processing cancelled", "session_id", sess.ID)
177 return nil
178 }
179 return fmt.Errorf("agent processing failed: %w", result.err)
180 }
181 return nil
182
183 case event := <-messageEvents:
184 msg := event.Payload
185 if msg.SessionID == sess.ID && msg.Role == message.Assistant && len(msg.Parts) > 0 {
186 stopSpinner()
187
188 content := msg.Content().String()
189 readBytes := messageReadBytes[msg.ID]
190
191 if len(content) < readBytes {
192 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(content), "read_bytes", readBytes)
193 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(content), readBytes)
194 }
195
196 part := content[readBytes:]
197 fmt.Print(part)
198 messageReadBytes[msg.ID] = len(content)
199 }
200
201 case <-ctx.Done():
202 stopSpinner()
203 return ctx.Err()
204 }
205 }
206}
207
208func (app *App) UpdateAgentModel() error {
209 return app.AgentCoordinator.UpdateModels()
210}
211
212func (app *App) setupEvents() {
213 ctx, cancel := context.WithCancel(app.globalCtx)
214 app.eventsCtx = ctx
215 setupSubscriber(ctx, app.serviceEventsWG, "sessions", app.Sessions.Subscribe, app.events)
216 setupSubscriber(ctx, app.serviceEventsWG, "messages", app.Messages.Subscribe, app.events)
217 setupSubscriber(ctx, app.serviceEventsWG, "permissions", app.Permissions.Subscribe, app.events)
218 setupSubscriber(ctx, app.serviceEventsWG, "permissions-notifications", app.Permissions.SubscribeNotifications, app.events)
219 setupSubscriber(ctx, app.serviceEventsWG, "history", app.History.Subscribe, app.events)
220 setupSubscriber(ctx, app.serviceEventsWG, "mcp", tools.SubscribeMCPEvents, app.events)
221 setupSubscriber(ctx, app.serviceEventsWG, "lsp", SubscribeLSPEvents, app.events)
222 cleanupFunc := func() error {
223 cancel()
224 app.serviceEventsWG.Wait()
225 return nil
226 }
227 app.cleanupFuncs = append(app.cleanupFuncs, cleanupFunc)
228}
229
230func setupSubscriber[T any](
231 ctx context.Context,
232 wg *sync.WaitGroup,
233 name string,
234 subscriber func(context.Context) <-chan pubsub.Event[T],
235 outputCh chan<- tea.Msg,
236) {
237 wg.Go(func() {
238 subCh := subscriber(ctx)
239 for {
240 select {
241 case event, ok := <-subCh:
242 if !ok {
243 slog.Debug("subscription channel closed", "name", name)
244 return
245 }
246 var msg tea.Msg = event
247 select {
248 case outputCh <- msg:
249 case <-time.After(2 * time.Second):
250 slog.Warn("message dropped due to slow consumer", "name", name)
251 case <-ctx.Done():
252 slog.Debug("subscription cancelled", "name", name)
253 return
254 }
255 case <-ctx.Done():
256 slog.Debug("subscription cancelled", "name", name)
257 return
258 }
259 }
260 })
261}
262
263func (app *App) InitCoderAgent() error {
264 coderAgentCfg := app.config.Agents[config.AgentCoder]
265 if coderAgentCfg.ID == "" {
266 return fmt.Errorf("coder agent configuration is missing")
267 }
268 var err error
269 app.AgentCoordinator, err = agent.NewCoordinator(
270 app.config,
271 app.Sessions,
272 app.Messages,
273 app.Permissions,
274 app.History,
275 app.LSPClients,
276 )
277 if err != nil {
278 slog.Error("Failed to create coder agent", "err", err)
279 return err
280 }
281
282 // Add MCP client cleanup to shutdown process
283 app.cleanupFuncs = append(app.cleanupFuncs, tools.CloseMCPClients)
284 return nil
285}
286
287// Subscribe sends events to the TUI as tea.Msgs.
288func (app *App) Subscribe(program *tea.Program) {
289 defer log.RecoverPanic("app.Subscribe", func() {
290 slog.Info("TUI subscription panic: attempting graceful shutdown")
291 program.Quit()
292 })
293
294 app.tuiWG.Add(1)
295 tuiCtx, tuiCancel := context.WithCancel(app.globalCtx)
296 app.cleanupFuncs = append(app.cleanupFuncs, func() error {
297 slog.Debug("Cancelling TUI message handler")
298 tuiCancel()
299 app.tuiWG.Wait()
300 return nil
301 })
302 defer app.tuiWG.Done()
303
304 for {
305 select {
306 case <-tuiCtx.Done():
307 slog.Debug("TUI message handler shutting down")
308 return
309 case msg, ok := <-app.events:
310 if !ok {
311 slog.Debug("TUI message channel closed")
312 return
313 }
314 program.Send(msg)
315 }
316 }
317}
318
319// Shutdown performs a graceful shutdown of the application.
320func (app *App) Shutdown() {
321 if app.AgentCoordinator != nil {
322 app.AgentCoordinator.CancelAll()
323 }
324
325 // Shutdown all LSP clients.
326 for name, client := range app.LSPClients.Seq2() {
327 shutdownCtx, cancel := context.WithTimeout(app.globalCtx, 5*time.Second)
328 if err := client.Close(shutdownCtx); err != nil {
329 slog.Error("Failed to shutdown LSP client", "name", name, "error", err)
330 }
331 cancel()
332 }
333
334 // Call call cleanup functions.
335 for _, cleanup := range app.cleanupFuncs {
336 if cleanup != nil {
337 if err := cleanup(); err != nil {
338 slog.Error("Failed to cleanup app properly on shutdown", "error", err)
339 }
340 }
341 }
342}