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/config"
14 "github.com/charmbracelet/crush/internal/csync"
15 "github.com/charmbracelet/crush/internal/db"
16 "github.com/charmbracelet/crush/internal/format"
17 "github.com/charmbracelet/crush/internal/history"
18 "github.com/charmbracelet/crush/internal/llm/agent"
19 "github.com/charmbracelet/crush/internal/log"
20 "github.com/charmbracelet/crush/internal/pubsub"
21
22 "github.com/charmbracelet/crush/internal/lsp"
23 "github.com/charmbracelet/crush/internal/message"
24 "github.com/charmbracelet/crush/internal/permission"
25 "github.com/charmbracelet/crush/internal/session"
26 "github.com/charmbracelet/crush/internal/update"
27)
28
29type App struct {
30 Sessions session.Service
31 Messages message.Service
32 History history.Service
33 Permissions permission.Service
34
35 CoderAgent agent.Service
36
37 LSPClients *csync.Map[string, *lsp.Client]
38
39 config *config.Config
40
41 serviceEventsWG *sync.WaitGroup
42 eventsCtx context.Context
43 events chan tea.Msg
44 tuiWG *sync.WaitGroup
45
46 // global context and cleanup functions
47 globalCtx context.Context
48 cleanupFuncs []func() error
49}
50
51// New initializes a new applcation instance.
52func New(ctx context.Context, conn *sql.DB, cfg *config.Config) (*App, error) {
53 q := db.New(conn)
54 sessions := session.NewService(q)
55 messages := message.NewService(q)
56 files := history.NewService(q, conn)
57 skipPermissionsRequests := cfg.Permissions != nil && cfg.Permissions.SkipRequests
58 allowedTools := []string{}
59 if cfg.Permissions != nil && cfg.Permissions.AllowedTools != nil {
60 allowedTools = cfg.Permissions.AllowedTools
61 }
62
63 app := &App{
64 Sessions: sessions,
65 Messages: messages,
66 History: files,
67 Permissions: permission.NewPermissionService(cfg.WorkingDir(), skipPermissionsRequests, allowedTools),
68 LSPClients: csync.NewMap[string, *lsp.Client](),
69
70 globalCtx: ctx,
71
72 config: cfg,
73
74 events: make(chan tea.Msg, 100),
75 serviceEventsWG: &sync.WaitGroup{},
76 tuiWG: &sync.WaitGroup{},
77 }
78
79 app.setupEvents()
80
81 // Initialize LSP clients in the background.
82 app.initLSPClients(ctx)
83
84 // Check for updates in the background.
85 go app.checkForUpdates(ctx)
86
87 // cleanup database upon app shutdown
88 app.cleanupFuncs = append(app.cleanupFuncs, conn.Close)
89
90 // TODO: remove the concept of agent config, most likely.
91 if cfg.IsConfigured() {
92 if err := app.InitCoderAgent(); err != nil {
93 return nil, fmt.Errorf("failed to initialize coder agent: %w", err)
94 }
95 } else {
96 slog.Warn("No agent configuration found")
97 }
98 return app, nil
99}
100
101// Config returns the application configuration.
102func (app *App) Config() *config.Config {
103 return app.config
104}
105
106// RunNonInteractive handles the execution flow when a prompt is provided via
107// CLI flag.
108func (app *App) RunNonInteractive(ctx context.Context, prompt string, quiet bool) error {
109 slog.Info("Running in non-interactive mode")
110
111 ctx, cancel := context.WithCancel(ctx)
112 defer cancel()
113
114 // Start spinner if not in quiet mode.
115 var spinner *format.Spinner
116 if !quiet {
117 spinner = format.NewSpinner(ctx, cancel, "Generating")
118 spinner.Start()
119 }
120
121 // Helper function to stop spinner once.
122 stopSpinner := func() {
123 if !quiet && spinner != nil {
124 spinner.Stop()
125 spinner = nil
126 }
127 }
128 defer stopSpinner()
129
130 const maxPromptLengthForTitle = 100
131 titlePrefix := "Non-interactive: "
132 var titleSuffix string
133
134 if len(prompt) > maxPromptLengthForTitle {
135 titleSuffix = prompt[:maxPromptLengthForTitle] + "..."
136 } else {
137 titleSuffix = prompt
138 }
139 title := titlePrefix + titleSuffix
140
141 sess, err := app.Sessions.Create(ctx, title)
142 if err != nil {
143 return fmt.Errorf("failed to create session for non-interactive mode: %w", err)
144 }
145 slog.Info("Created session for non-interactive run", "session_id", sess.ID)
146
147 // Automatically approve all permission requests for this non-interactive session
148 app.Permissions.AutoApproveSession(sess.ID)
149
150 done, err := app.CoderAgent.Run(ctx, sess.ID, prompt)
151 if err != nil {
152 return fmt.Errorf("failed to start agent processing stream: %w", err)
153 }
154
155 messageEvents := app.Messages.Subscribe(ctx)
156 messageReadBytes := make(map[string]int)
157
158 for {
159 select {
160 case result := <-done:
161 stopSpinner()
162
163 if result.Error != nil {
164 if errors.Is(result.Error, context.Canceled) || errors.Is(result.Error, agent.ErrRequestCancelled) {
165 slog.Info("Non-interactive: agent processing cancelled", "session_id", sess.ID)
166 return nil
167 }
168 return fmt.Errorf("agent processing failed: %w", result.Error)
169 }
170
171 msgContent := result.Message.Content().String()
172 readBts := messageReadBytes[result.Message.ID]
173
174 if len(msgContent) < readBts {
175 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(msgContent), "read_bytes", readBts)
176 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(msgContent), readBts)
177 }
178 fmt.Println(msgContent[readBts:])
179 messageReadBytes[result.Message.ID] = len(msgContent)
180
181 slog.Info("Non-interactive: run completed", "session_id", sess.ID)
182 return nil
183
184 case event := <-messageEvents:
185 msg := event.Payload
186 if msg.SessionID == sess.ID && msg.Role == message.Assistant && len(msg.Parts) > 0 {
187 stopSpinner()
188
189 content := msg.Content().String()
190 readBytes := messageReadBytes[msg.ID]
191
192 if len(content) < readBytes {
193 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(content), "read_bytes", readBytes)
194 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(content), readBytes)
195 }
196
197 part := content[readBytes:]
198 fmt.Print(part)
199 messageReadBytes[msg.ID] = len(content)
200 }
201
202 case <-ctx.Done():
203 stopSpinner()
204 return ctx.Err()
205 }
206 }
207}
208
209func (app *App) UpdateAgentModel() error {
210 return app.CoderAgent.UpdateModel()
211}
212
213func (app *App) setupEvents() {
214 ctx, cancel := context.WithCancel(app.globalCtx)
215 app.eventsCtx = ctx
216 setupSubscriber(ctx, app.serviceEventsWG, "sessions", app.Sessions.Subscribe, app.events)
217 setupSubscriber(ctx, app.serviceEventsWG, "messages", app.Messages.Subscribe, app.events)
218 setupSubscriber(ctx, app.serviceEventsWG, "permissions", app.Permissions.Subscribe, app.events)
219 setupSubscriber(ctx, app.serviceEventsWG, "permissions-notifications", app.Permissions.SubscribeNotifications, app.events)
220 setupSubscriber(ctx, app.serviceEventsWG, "history", app.History.Subscribe, app.events)
221 setupSubscriber(ctx, app.serviceEventsWG, "mcp", agent.SubscribeMCPEvents, app.events)
222 setupSubscriber(ctx, app.serviceEventsWG, "lsp", SubscribeLSPEvents, app.events)
223 cleanupFunc := func() error {
224 cancel()
225 app.serviceEventsWG.Wait()
226 return nil
227 }
228 app.cleanupFuncs = append(app.cleanupFuncs, cleanupFunc)
229}
230
231func setupSubscriber[T any](
232 ctx context.Context,
233 wg *sync.WaitGroup,
234 name string,
235 subscriber func(context.Context) <-chan pubsub.Event[T],
236 outputCh chan<- tea.Msg,
237) {
238 wg.Go(func() {
239 subCh := subscriber(ctx)
240 for {
241 select {
242 case event, ok := <-subCh:
243 if !ok {
244 slog.Debug("subscription channel closed", "name", name)
245 return
246 }
247 var msg tea.Msg = event
248 select {
249 case outputCh <- msg:
250 case <-time.After(2 * time.Second):
251 slog.Warn("message dropped due to slow consumer", "name", name)
252 case <-ctx.Done():
253 slog.Debug("subscription cancelled", "name", name)
254 return
255 }
256 case <-ctx.Done():
257 slog.Debug("subscription cancelled", "name", name)
258 return
259 }
260 }
261 })
262}
263
264func (app *App) InitCoderAgent() error {
265 coderAgentCfg := app.config.Agents["coder"]
266 if coderAgentCfg.ID == "" {
267 return fmt.Errorf("coder agent configuration is missing")
268 }
269 var err error
270 app.CoderAgent, err = agent.NewAgent(
271 app.globalCtx,
272 coderAgentCfg,
273 app.Permissions,
274 app.Sessions,
275 app.Messages,
276 app.History,
277 app.LSPClients,
278 )
279 if err != nil {
280 slog.Error("Failed to create coder agent", "err", err)
281 return err
282 }
283
284 // Add MCP client cleanup to shutdown process
285 app.cleanupFuncs = append(app.cleanupFuncs, agent.CloseMCPClients)
286
287 setupSubscriber(app.eventsCtx, app.serviceEventsWG, "coderAgent", app.CoderAgent.Subscribe, app.events)
288 return nil
289}
290
291// Subscribe sends events to the TUI as tea.Msgs.
292func (app *App) Subscribe(program *tea.Program) {
293 defer log.RecoverPanic("app.Subscribe", func() {
294 slog.Info("TUI subscription panic: attempting graceful shutdown")
295 program.Quit()
296 })
297
298 app.tuiWG.Add(1)
299 tuiCtx, tuiCancel := context.WithCancel(app.globalCtx)
300 app.cleanupFuncs = append(app.cleanupFuncs, func() error {
301 slog.Debug("Cancelling TUI message handler")
302 tuiCancel()
303 app.tuiWG.Wait()
304 return nil
305 })
306 defer app.tuiWG.Done()
307
308 for {
309 select {
310 case <-tuiCtx.Done():
311 slog.Debug("TUI message handler shutting down")
312 return
313 case msg, ok := <-app.events:
314 if !ok {
315 slog.Debug("TUI message channel closed")
316 return
317 }
318 program.Send(msg)
319 }
320 }
321}
322
323// Shutdown performs a graceful shutdown of the application.
324func (app *App) Shutdown() {
325 if app.CoderAgent != nil {
326 app.CoderAgent.CancelAll()
327 }
328
329 // Shutdown all LSP clients.
330 for name, client := range app.LSPClients.Seq2() {
331 shutdownCtx, cancel := context.WithTimeout(app.globalCtx, 5*time.Second)
332 if err := client.Close(shutdownCtx); err != nil {
333 slog.Error("Failed to shutdown LSP client", "name", name, "error", err)
334 }
335 cancel()
336 }
337
338 // Call call cleanup functions.
339 for _, cleanup := range app.cleanupFuncs {
340 if cleanup != nil {
341 if err := cleanup(); err != nil {
342 slog.Error("Failed to cleanup app properly on shutdown", "error", err)
343 }
344 }
345 }
346}
347
348// checkForUpdates checks for available updates in the background.
349func (app *App) checkForUpdates(ctx context.Context) {
350 // Use a timeout to avoid hanging indefinitely.
351 checkCtx, cancel := context.WithTimeout(ctx, 5*time.Second)
352 defer cancel()
353
354 // Check for updates asynchronously.
355 updateCh := update.CheckForUpdateAsync(checkCtx, app.config.Options.DataDirectory)
356
357 select {
358 case info := <-updateCh:
359 if info != nil && info.Available {
360 // Send update notification through the event system.
361 app.events <- pubsub.UpdateAvailableMsg{
362 CurrentVersion: info.CurrentVersion,
363 LatestVersion: info.LatestVersion,
364 }
365 }
366 case <-checkCtx.Done():
367 // Timeout or context cancelled.
368 return
369 }
370}