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/message"
25 "github.com/charmbracelet/crush/internal/permission"
26 "github.com/charmbracelet/crush/internal/session"
27 "github.com/charmbracelet/crush/internal/update"
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()
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 // Initialize LSP clients in the background.
90 app.initLSPClients(ctx)
91
92 // Check for updates in the background.
93 go app.checkForUpdates(ctx)
94
95 // TODO: remove the concept of agent config, most likely.
96 if cfg.IsConfigured() {
97 if err := app.InitCoderAgent(); err != nil {
98 return nil, fmt.Errorf("failed to initialize coder agent: %w", err)
99 }
100 } else {
101 slog.Warn("No agent configuration found")
102 }
103 return app, nil
104}
105
106// Config returns the application configuration.
107func (app *App) Config() *config.Config {
108 return app.config
109}
110
111// RunNonInteractive handles the execution flow when a prompt is provided via
112// CLI flag.
113func (app *App) RunNonInteractive(ctx context.Context, prompt string, quiet bool) error {
114 slog.Info("Running in non-interactive mode")
115
116 ctx, cancel := context.WithCancel(ctx)
117 defer cancel()
118
119 // Start spinner if not in quiet mode.
120 var spinner *format.Spinner
121 if !quiet {
122 spinner = format.NewSpinner(ctx, cancel, "Generating")
123 spinner.Start()
124 }
125
126 // Helper function to stop spinner once.
127 stopSpinner := func() {
128 if !quiet && spinner != nil {
129 spinner.Stop()
130 spinner = nil
131 }
132 }
133 defer stopSpinner()
134
135 const maxPromptLengthForTitle = 100
136 titlePrefix := "Non-interactive: "
137 var titleSuffix string
138
139 if len(prompt) > maxPromptLengthForTitle {
140 titleSuffix = prompt[:maxPromptLengthForTitle] + "..."
141 } else {
142 titleSuffix = prompt
143 }
144 title := titlePrefix + titleSuffix
145
146 sess, err := app.Sessions.Create(ctx, title)
147 if err != nil {
148 return fmt.Errorf("failed to create session for non-interactive mode: %w", err)
149 }
150 slog.Info("Created session for non-interactive run", "session_id", sess.ID)
151
152 // Automatically approve all permission requests for this non-interactive session
153 app.Permissions.AutoApproveSession(sess.ID)
154
155 done, err := app.CoderAgent.Run(ctx, sess.ID, prompt)
156 if err != nil {
157 return fmt.Errorf("failed to start agent processing stream: %w", err)
158 }
159
160 messageEvents := app.Messages.Subscribe(ctx)
161 readBts := 0
162
163 for {
164 select {
165 case result := <-done:
166 stopSpinner()
167
168 if result.Error != nil {
169 if errors.Is(result.Error, context.Canceled) || errors.Is(result.Error, agent.ErrRequestCancelled) {
170 slog.Info("Non-interactive: agent processing cancelled", "session_id", sess.ID)
171 return nil
172 }
173 return fmt.Errorf("agent processing failed: %w", result.Error)
174 }
175
176 msgContent := result.Message.Content().String()
177 if len(msgContent) < readBts {
178 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(msgContent), "read_bytes", readBts)
179 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(msgContent), readBts)
180 }
181 fmt.Println(msgContent[readBts:])
182
183 slog.Info("Non-interactive: run completed", "session_id", sess.ID)
184 return nil
185
186 case event := <-messageEvents:
187 msg := event.Payload
188 if msg.SessionID == sess.ID && msg.Role == message.Assistant && len(msg.Parts) > 0 {
189 stopSpinner()
190 part := msg.Content().String()[readBts:]
191 fmt.Print(part)
192 readBts += len(part)
193 }
194
195 case <-ctx.Done():
196 stopSpinner()
197 return ctx.Err()
198 }
199 }
200}
201
202func (app *App) UpdateAgentModel() error {
203 return app.CoderAgent.UpdateModel()
204}
205
206func (app *App) setupEvents() {
207 ctx, cancel := context.WithCancel(app.globalCtx)
208 app.eventsCtx = ctx
209 setupSubscriber(ctx, app.serviceEventsWG, "sessions", app.Sessions.Subscribe, app.events)
210 setupSubscriber(ctx, app.serviceEventsWG, "messages", app.Messages.Subscribe, app.events)
211 setupSubscriber(ctx, app.serviceEventsWG, "permissions", app.Permissions.Subscribe, app.events)
212 setupSubscriber(ctx, app.serviceEventsWG, "permissions-notifications", app.Permissions.SubscribeNotifications, app.events)
213 setupSubscriber(ctx, app.serviceEventsWG, "history", app.History.Subscribe, app.events)
214 cleanupFunc := func() {
215 cancel()
216 app.serviceEventsWG.Wait()
217 }
218 app.cleanupFuncs = append(app.cleanupFuncs, cleanupFunc)
219}
220
221func setupSubscriber[T any](
222 ctx context.Context,
223 wg *sync.WaitGroup,
224 name string,
225 subscriber func(context.Context) <-chan pubsub.Event[T],
226 outputCh chan<- tea.Msg,
227) {
228 wg.Add(1)
229 go func() {
230 defer wg.Done()
231 subCh := subscriber(ctx)
232 for {
233 select {
234 case event, ok := <-subCh:
235 if !ok {
236 slog.Debug("subscription channel closed", "name", name)
237 return
238 }
239 var msg tea.Msg = event
240 select {
241 case outputCh <- msg:
242 case <-time.After(2 * time.Second):
243 slog.Warn("message dropped due to slow consumer", "name", name)
244 case <-ctx.Done():
245 slog.Debug("subscription cancelled", "name", name)
246 return
247 }
248 case <-ctx.Done():
249 slog.Debug("subscription cancelled", "name", name)
250 return
251 }
252 }
253 }()
254}
255
256func (app *App) InitCoderAgent() error {
257 coderAgentCfg := app.config.Agents["coder"]
258 if coderAgentCfg.ID == "" {
259 return fmt.Errorf("coder agent configuration is missing")
260 }
261 var err error
262 app.CoderAgent, err = agent.NewAgent(
263 app.globalCtx,
264 coderAgentCfg,
265 app.Permissions,
266 app.Sessions,
267 app.Messages,
268 app.History,
269 app.LSPClients,
270 )
271 if err != nil {
272 slog.Error("Failed to create coder agent", "err", err)
273 return err
274 }
275
276 // Add MCP client cleanup to shutdown process
277 app.cleanupFuncs = append(app.cleanupFuncs, agent.CloseMCPClients)
278
279 setupSubscriber(app.eventsCtx, app.serviceEventsWG, "coderAgent", app.CoderAgent.Subscribe, app.events)
280 return nil
281}
282
283// Subscribe sends events to the TUI as tea.Msgs.
284func (app *App) Subscribe(program *tea.Program) {
285 defer log.RecoverPanic("app.Subscribe", func() {
286 slog.Info("TUI subscription panic: attempting graceful shutdown")
287 program.Quit()
288 })
289
290 app.tuiWG.Add(1)
291 tuiCtx, tuiCancel := context.WithCancel(app.globalCtx)
292 app.cleanupFuncs = append(app.cleanupFuncs, func() {
293 slog.Debug("Cancelling TUI message handler")
294 tuiCancel()
295 app.tuiWG.Wait()
296 })
297 defer app.tuiWG.Done()
298
299 for {
300 select {
301 case <-tuiCtx.Done():
302 slog.Debug("TUI message handler shutting down")
303 return
304 case msg, ok := <-app.events:
305 if !ok {
306 slog.Debug("TUI message channel closed")
307 return
308 }
309 program.Send(msg)
310 }
311 }
312}
313
314// Shutdown performs a graceful shutdown of the application.
315func (app *App) Shutdown() {
316 if app.CoderAgent != nil {
317 app.CoderAgent.CancelAll()
318 }
319
320 for cancel := range app.watcherCancelFuncs.Seq() {
321 cancel()
322 }
323
324 // Wait for all LSP watchers to finish.
325 app.lspWatcherWG.Wait()
326
327 // Get all LSP clients.
328 app.clientsMutex.RLock()
329 clients := make(map[string]*lsp.Client, len(app.LSPClients))
330 maps.Copy(clients, app.LSPClients)
331 app.clientsMutex.RUnlock()
332
333 // Shutdown all LSP clients.
334 for name, client := range clients {
335 shutdownCtx, cancel := context.WithTimeout(app.globalCtx, 5*time.Second)
336 if err := client.Shutdown(shutdownCtx); err != nil {
337 slog.Error("Failed to shutdown LSP client", "name", name, "error", err)
338 }
339 cancel()
340 }
341
342 // Call call cleanup functions.
343 for _, cleanup := range app.cleanupFuncs {
344 if cleanup != nil {
345 cleanup()
346 }
347 }
348}
349
350// checkForUpdates checks for available updates in the background.
351func (app *App) checkForUpdates(ctx context.Context) {
352 // Use a timeout to avoid hanging indefinitely.
353 checkCtx, cancel := context.WithTimeout(ctx, 5*time.Second)
354 defer cancel()
355
356 // Check for updates asynchronously.
357 updateCh := update.CheckForUpdateAsync(checkCtx, app.config.Options.DataDirectory)
358
359 select {
360 case info := <-updateCh:
361 if info != nil && info.Available {
362 // Send update notification through the event system.
363 app.events <- pubsub.UpdateAvailableMsg{
364 CurrentVersion: info.CurrentVersion,
365 LatestVersion: info.LatestVersion,
366 }
367 }
368 case <-checkCtx.Done():
369 // Timeout or context cancelled.
370 return
371 }
372}