1package app
2
3import (
4 "context"
5 "database/sql"
6 "errors"
7 "fmt"
8 "log/slog"
9 "maps"
10 "sync"
11 "time"
12
13 tea "github.com/charmbracelet/bubbletea/v2"
14 "github.com/charmbracelet/crush/internal/config"
15 "github.com/charmbracelet/crush/internal/csync"
16 "github.com/charmbracelet/crush/internal/db"
17 "github.com/charmbracelet/crush/internal/format"
18 "github.com/charmbracelet/crush/internal/history"
19 "github.com/charmbracelet/crush/internal/llm/agent"
20 "github.com/charmbracelet/crush/internal/log"
21 "github.com/charmbracelet/crush/internal/pubsub"
22
23 "github.com/charmbracelet/crush/internal/lsp"
24 "github.com/charmbracelet/crush/internal/lsp/watcher"
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 CoderAgent agent.Service
37
38 LSPClients map[string]*lsp.Client
39
40 clientsMutex sync.RWMutex
41
42 watcherCancelFuncs *csync.Slice[context.CancelFunc]
43 lspWatcherWG sync.WaitGroup
44
45 config *config.Config
46
47 serviceEventsWG *sync.WaitGroup
48 eventsCtx context.Context
49 events chan tea.Msg
50 tuiWG *sync.WaitGroup
51
52 // global context and cleanup functions
53 globalCtx context.Context
54 cleanupFuncs []func() error
55}
56
57// New initializes a new applcation instance.
58func New(ctx context.Context, conn *sql.DB, cfg *config.Config) (*App, error) {
59 q := db.New(conn)
60 sessions := session.NewService(q)
61 messages := message.NewService(q)
62 files := history.NewService(q, conn)
63 skipPermissionsRequests := cfg.Permissions != nil && cfg.Permissions.SkipRequests
64 allowedTools := []string{}
65 if cfg.Permissions != nil && cfg.Permissions.AllowedTools != nil {
66 allowedTools = cfg.Permissions.AllowedTools
67 }
68
69 app := &App{
70 Sessions: sessions,
71 Messages: messages,
72 History: files,
73 Permissions: permission.NewPermissionService(cfg.WorkingDir(), skipPermissionsRequests, allowedTools),
74 LSPClients: make(map[string]*lsp.Client),
75
76 globalCtx: ctx,
77
78 config: cfg,
79
80 watcherCancelFuncs: csync.NewSlice[context.CancelFunc](),
81
82 events: make(chan tea.Msg, 100),
83 serviceEventsWG: &sync.WaitGroup{},
84 tuiWG: &sync.WaitGroup{},
85 }
86
87 app.setupEvents()
88
89 // Start the global watcher
90 if err := watcher.Start(); err != nil {
91 return nil, fmt.Errorf("app: %w", err)
92 }
93
94 // Initialize LSP clients in the background.
95 app.initLSPClients(ctx)
96
97 // cleanup database upon app shutdown
98 app.cleanupFuncs = append(app.cleanupFuncs, conn.Close)
99
100 // TODO: remove the concept of agent config, most likely.
101 if cfg.IsConfigured() {
102 if err := app.InitCoderAgent(); err != nil {
103 return nil, fmt.Errorf("failed to initialize coder agent: %w", err)
104 }
105 } else {
106 slog.Warn("No agent configuration found")
107 }
108 return app, nil
109}
110
111// Config returns the application configuration.
112func (app *App) Config() *config.Config {
113 return app.config
114}
115
116// RunNonInteractive handles the execution flow when a prompt is provided via
117// CLI flag.
118func (app *App) RunNonInteractive(ctx context.Context, prompt string, quiet bool) error {
119 slog.Info("Running in non-interactive mode")
120
121 ctx, cancel := context.WithCancel(ctx)
122 defer cancel()
123
124 // Start spinner if not in quiet mode.
125 var spinner *format.Spinner
126 if !quiet {
127 spinner = format.NewSpinner(ctx, cancel, "Generating")
128 spinner.Start()
129 }
130
131 // Helper function to stop spinner once.
132 stopSpinner := func() {
133 if !quiet && spinner != nil {
134 spinner.Stop()
135 spinner = nil
136 }
137 }
138 defer stopSpinner()
139
140 const maxPromptLengthForTitle = 100
141 titlePrefix := "Non-interactive: "
142 var titleSuffix string
143
144 if len(prompt) > maxPromptLengthForTitle {
145 titleSuffix = prompt[:maxPromptLengthForTitle] + "..."
146 } else {
147 titleSuffix = prompt
148 }
149 title := titlePrefix + titleSuffix
150
151 sess, err := app.Sessions.Create(ctx, title)
152 if err != nil {
153 return fmt.Errorf("failed to create session for non-interactive mode: %w", err)
154 }
155 slog.Info("Created session for non-interactive run", "session_id", sess.ID)
156
157 // Automatically approve all permission requests for this non-interactive session
158 app.Permissions.AutoApproveSession(sess.ID)
159
160 done, err := app.CoderAgent.Run(ctx, sess.ID, prompt)
161 if err != nil {
162 return fmt.Errorf("failed to start agent processing stream: %w", err)
163 }
164
165 messageEvents := app.Messages.Subscribe(ctx)
166 messageReadBytes := make(map[string]int)
167
168 for {
169 select {
170 case result := <-done:
171 stopSpinner()
172
173 if result.Error != nil {
174 if errors.Is(result.Error, context.Canceled) || errors.Is(result.Error, agent.ErrRequestCancelled) {
175 slog.Info("Non-interactive: agent processing cancelled", "session_id", sess.ID)
176 return nil
177 }
178 return fmt.Errorf("agent processing failed: %w", result.Error)
179 }
180
181 msgContent := result.Message.Content().String()
182 readBts := messageReadBytes[result.Message.ID]
183
184 if len(msgContent) < readBts {
185 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(msgContent), "read_bytes", readBts)
186 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(msgContent), readBts)
187 }
188 fmt.Println(msgContent[readBts:])
189 messageReadBytes[result.Message.ID] = len(msgContent)
190
191 slog.Info("Non-interactive: run completed", "session_id", sess.ID)
192 return nil
193
194 case event := <-messageEvents:
195 msg := event.Payload
196 if msg.SessionID == sess.ID && msg.Role == message.Assistant && len(msg.Parts) > 0 {
197 stopSpinner()
198
199 content := msg.Content().String()
200 readBytes := messageReadBytes[msg.ID]
201
202 if len(content) < readBytes {
203 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(content), "read_bytes", readBytes)
204 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(content), readBytes)
205 }
206
207 part := content[readBytes:]
208 fmt.Print(part)
209 messageReadBytes[msg.ID] = len(content)
210 }
211
212 case <-ctx.Done():
213 stopSpinner()
214 return ctx.Err()
215 }
216 }
217}
218
219func (app *App) UpdateAgentModel() error {
220 return app.CoderAgent.UpdateModel()
221}
222
223func (app *App) setupEvents() {
224 ctx, cancel := context.WithCancel(app.globalCtx)
225 app.eventsCtx = ctx
226 setupSubscriber(ctx, app.serviceEventsWG, "sessions", app.Sessions.Subscribe, app.events)
227 setupSubscriber(ctx, app.serviceEventsWG, "messages", app.Messages.Subscribe, app.events)
228 setupSubscriber(ctx, app.serviceEventsWG, "permissions", app.Permissions.Subscribe, app.events)
229 setupSubscriber(ctx, app.serviceEventsWG, "permissions-notifications", app.Permissions.SubscribeNotifications, app.events)
230 setupSubscriber(ctx, app.serviceEventsWG, "history", app.History.Subscribe, app.events)
231 setupSubscriber(ctx, app.serviceEventsWG, "mcp", agent.SubscribeMCPEvents, app.events)
232 setupSubscriber(ctx, app.serviceEventsWG, "lsp", SubscribeLSPEvents, app.events)
233 cleanupFunc := func() error {
234 cancel()
235 app.serviceEventsWG.Wait()
236 return nil
237 }
238 app.cleanupFuncs = append(app.cleanupFuncs, cleanupFunc)
239}
240
241func setupSubscriber[T any](
242 ctx context.Context,
243 wg *sync.WaitGroup,
244 name string,
245 subscriber func(context.Context) <-chan pubsub.Event[T],
246 outputCh chan<- tea.Msg,
247) {
248 wg.Go(func() {
249 subCh := subscriber(ctx)
250 for {
251 select {
252 case event, ok := <-subCh:
253 if !ok {
254 slog.Debug("subscription channel closed", "name", name)
255 return
256 }
257 var msg tea.Msg = event
258 select {
259 case outputCh <- msg:
260 case <-time.After(2 * time.Second):
261 slog.Warn("message dropped due to slow consumer", "name", name)
262 case <-ctx.Done():
263 slog.Debug("subscription cancelled", "name", name)
264 return
265 }
266 case <-ctx.Done():
267 slog.Debug("subscription cancelled", "name", name)
268 return
269 }
270 }
271 })
272}
273
274func (app *App) InitCoderAgent() error {
275 coderAgentCfg := app.config.Agents["coder"]
276 if coderAgentCfg.ID == "" {
277 return fmt.Errorf("coder agent configuration is missing")
278 }
279 var err error
280 app.CoderAgent, err = agent.NewAgent(
281 app.globalCtx,
282 coderAgentCfg,
283 app.Permissions,
284 app.Sessions,
285 app.Messages,
286 app.History,
287 app.LSPClients,
288 )
289 if err != nil {
290 slog.Error("Failed to create coder agent", "err", err)
291 return err
292 }
293
294 // Add MCP client cleanup to shutdown process
295 app.cleanupFuncs = append(app.cleanupFuncs, agent.CloseMCPClients)
296
297 setupSubscriber(app.eventsCtx, app.serviceEventsWG, "coderAgent", app.CoderAgent.Subscribe, app.events)
298 return nil
299}
300
301// Subscribe sends events to the TUI as tea.Msgs.
302func (app *App) Subscribe(program *tea.Program) {
303 defer log.RecoverPanic("app.Subscribe", func() {
304 slog.Info("TUI subscription panic: attempting graceful shutdown")
305 program.Quit()
306 })
307
308 app.tuiWG.Add(1)
309 tuiCtx, tuiCancel := context.WithCancel(app.globalCtx)
310 app.cleanupFuncs = append(app.cleanupFuncs, func() error {
311 slog.Debug("Cancelling TUI message handler")
312 tuiCancel()
313 app.tuiWG.Wait()
314 return nil
315 })
316 defer app.tuiWG.Done()
317
318 for {
319 select {
320 case <-tuiCtx.Done():
321 slog.Debug("TUI message handler shutting down")
322 return
323 case msg, ok := <-app.events:
324 if !ok {
325 slog.Debug("TUI message channel closed")
326 return
327 }
328 program.Send(msg)
329 }
330 }
331}
332
333// Shutdown performs a graceful shutdown of the application.
334func (app *App) Shutdown() {
335 if app.CoderAgent != nil {
336 app.CoderAgent.CancelAll()
337 }
338
339 for cancel := range app.watcherCancelFuncs.Seq() {
340 cancel()
341 }
342
343 // Wait for all LSP watchers to finish.
344 app.lspWatcherWG.Wait()
345
346 // Get all LSP clients.
347 app.clientsMutex.RLock()
348 clients := make(map[string]*lsp.Client, len(app.LSPClients))
349 maps.Copy(clients, app.LSPClients)
350 app.clientsMutex.RUnlock()
351
352 // Shutdown all LSP clients.
353 for name, client := range clients {
354 shutdownCtx, cancel := context.WithTimeout(app.globalCtx, 5*time.Second)
355 if err := client.Shutdown(shutdownCtx); err != nil {
356 slog.Error("Failed to shutdown LSP client", "name", name, "error", err)
357 }
358 cancel()
359 }
360
361 // Shutdown the global watcher
362 watcher.Shutdown()
363
364 // Call call cleanup functions.
365 for _, cleanup := range app.cleanupFuncs {
366 if cleanup != nil {
367 if err := cleanup(); err != nil {
368 slog.Error("Failed to cleanup app properly on shutdown", "error", err)
369 }
370 }
371 }
372}