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)
27
28type App struct {
29 Sessions session.Service
30 Messages message.Service
31 History history.Service
32 Permissions permission.Service
33
34 CoderAgent agent.Service
35
36 LSPClients *csync.Map[string, *lsp.Client]
37
38 config *config.Config
39
40 serviceEventsWG *sync.WaitGroup
41 eventsCtx context.Context
42 events chan tea.Msg
43 tuiWG *sync.WaitGroup
44
45 // global context and cleanup functions
46 globalCtx context.Context
47 cleanupFuncs []func() error
48}
49
50// New initializes a new applcation instance.
51func New(ctx context.Context, conn *sql.DB, cfg *config.Config) (*App, error) {
52 q := db.New(conn)
53 sessions := session.NewService(q)
54 messages := message.NewService(q)
55 files := history.NewService(q, conn)
56 skipPermissionsRequests := cfg.Permissions != nil && cfg.Permissions.SkipRequests
57 allowedTools := []string{}
58 if cfg.Permissions != nil && cfg.Permissions.AllowedTools != nil {
59 allowedTools = cfg.Permissions.AllowedTools
60 }
61
62 app := &App{
63 Sessions: sessions,
64 Messages: messages,
65 History: files,
66 Permissions: permission.NewPermissionService(cfg.WorkingDir(), skipPermissionsRequests, allowedTools),
67 LSPClients: csync.NewMap[string, *lsp.Client](),
68
69 globalCtx: ctx,
70
71 config: cfg,
72
73 events: make(chan tea.Msg, 100),
74 serviceEventsWG: &sync.WaitGroup{},
75 tuiWG: &sync.WaitGroup{},
76 }
77
78 app.setupEvents()
79
80 // Initialize LSP clients in the background.
81 app.initLSPClients(ctx)
82
83 // cleanup database upon app shutdown
84 app.cleanupFuncs = append(app.cleanupFuncs, conn.Close)
85
86 // TODO: remove the concept of agent config, most likely.
87 if cfg.IsConfigured() {
88 if err := app.InitCoderAgent(); err != nil {
89 return nil, fmt.Errorf("failed to initialize coder agent: %w", err)
90 }
91 } else {
92 slog.Warn("No agent configuration found")
93 }
94 return app, nil
95}
96
97// Config returns the application configuration.
98func (app *App) Config() *config.Config {
99 return app.config
100}
101
102// RunNonInteractive handles the execution flow when a prompt is provided via
103// CLI flag.
104func (app *App) RunNonInteractive(ctx context.Context, prompt string, quiet bool) error {
105 slog.Info("Running in non-interactive mode")
106
107 ctx, cancel := context.WithCancel(ctx)
108 defer cancel()
109
110 // Start spinner if not in quiet mode.
111 var spinner *format.Spinner
112 if !quiet {
113 spinner = format.NewSpinner(ctx, cancel, "Generating")
114 spinner.Start()
115 }
116
117 // Helper function to stop spinner once.
118 stopSpinner := func() {
119 if !quiet && spinner != nil {
120 spinner.Stop()
121 spinner = nil
122 }
123 }
124 defer stopSpinner()
125
126 const maxPromptLengthForTitle = 100
127 titlePrefix := "Non-interactive: "
128 var titleSuffix string
129
130 if len(prompt) > maxPromptLengthForTitle {
131 titleSuffix = prompt[:maxPromptLengthForTitle] + "..."
132 } else {
133 titleSuffix = prompt
134 }
135 title := titlePrefix + titleSuffix
136
137 sess, err := app.Sessions.Create(ctx, title)
138 if err != nil {
139 return fmt.Errorf("failed to create session for non-interactive mode: %w", err)
140 }
141 slog.Info("Created session for non-interactive run", "session_id", sess.ID)
142
143 // Automatically approve all permission requests for this non-interactive session
144 app.Permissions.AutoApproveSession(sess.ID)
145
146 done, err := app.CoderAgent.Run(ctx, sess.ID, prompt)
147 if err != nil {
148 return fmt.Errorf("failed to start agent processing stream: %w", err)
149 }
150
151 messageEvents := app.Messages.Subscribe(ctx)
152 messageReadBytes := make(map[string]int)
153
154 for {
155 select {
156 case result := <-done:
157 stopSpinner()
158
159 if result.Error != nil {
160 if errors.Is(result.Error, context.Canceled) || errors.Is(result.Error, agent.ErrRequestCancelled) {
161 slog.Info("Non-interactive: agent processing cancelled", "session_id", sess.ID)
162 return nil
163 }
164 return fmt.Errorf("agent processing failed: %w", result.Error)
165 }
166
167 msgContent := result.Message.Content().String()
168 readBts := messageReadBytes[result.Message.ID]
169
170 if len(msgContent) < readBts {
171 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(msgContent), "read_bytes", readBts)
172 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(msgContent), readBts)
173 }
174 fmt.Println(msgContent[readBts:])
175 messageReadBytes[result.Message.ID] = len(msgContent)
176
177 slog.Info("Non-interactive: run completed", "session_id", sess.ID)
178 return nil
179
180 case event := <-messageEvents:
181 msg := event.Payload
182 if msg.SessionID == sess.ID && msg.Role == message.Assistant && len(msg.Parts) > 0 {
183 stopSpinner()
184
185 content := msg.Content().String()
186 readBytes := messageReadBytes[msg.ID]
187
188 if len(content) < readBytes {
189 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(content), "read_bytes", readBytes)
190 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(content), readBytes)
191 }
192
193 part := content[readBytes:]
194 fmt.Print(part)
195 messageReadBytes[msg.ID] = len(content)
196 }
197
198 case <-ctx.Done():
199 stopSpinner()
200 return ctx.Err()
201 }
202 }
203}
204
205func (app *App) UpdateAgentModel() error {
206 return app.CoderAgent.UpdateModel()
207}
208
209func (app *App) setupEvents() {
210 ctx, cancel := context.WithCancel(app.globalCtx)
211 app.eventsCtx = ctx
212 setupSubscriber(ctx, app.serviceEventsWG, "sessions", app.Sessions.Subscribe, app.events)
213 setupSubscriber(ctx, app.serviceEventsWG, "messages", app.Messages.Subscribe, app.events)
214 setupSubscriber(ctx, app.serviceEventsWG, "permissions", app.Permissions.Subscribe, app.events)
215 setupSubscriber(ctx, app.serviceEventsWG, "permissions-notifications", app.Permissions.SubscribeNotifications, app.events)
216 setupSubscriber(ctx, app.serviceEventsWG, "history", app.History.Subscribe, app.events)
217 setupSubscriber(ctx, app.serviceEventsWG, "mcp", agent.SubscribeMCPEvents, app.events)
218 setupSubscriber(ctx, app.serviceEventsWG, "lsp", SubscribeLSPEvents, app.events)
219 cleanupFunc := func() error {
220 cancel()
221 app.serviceEventsWG.Wait()
222 return nil
223 }
224 app.cleanupFuncs = append(app.cleanupFuncs, cleanupFunc)
225}
226
227func setupSubscriber[T any](
228 ctx context.Context,
229 wg *sync.WaitGroup,
230 name string,
231 subscriber func(context.Context) <-chan pubsub.Event[T],
232 outputCh chan<- tea.Msg,
233) {
234 wg.Go(func() {
235 subCh := subscriber(ctx)
236 for {
237 select {
238 case event, ok := <-subCh:
239 if !ok {
240 slog.Debug("subscription channel closed", "name", name)
241 return
242 }
243 var msg tea.Msg = event
244 select {
245 case outputCh <- msg:
246 case <-time.After(2 * time.Second):
247 slog.Warn("message dropped due to slow consumer", "name", name)
248 case <-ctx.Done():
249 slog.Debug("subscription cancelled", "name", name)
250 return
251 }
252 case <-ctx.Done():
253 slog.Debug("subscription cancelled", "name", name)
254 return
255 }
256 }
257 })
258}
259
260func (app *App) InitCoderAgent() error {
261 coderAgentCfg := app.config.Agents["coder"]
262 if coderAgentCfg.ID == "" {
263 return fmt.Errorf("coder agent configuration is missing")
264 }
265 var err error
266 app.CoderAgent, err = agent.NewAgent(
267 app.globalCtx,
268 coderAgentCfg,
269 app.Permissions,
270 app.Sessions,
271 app.Messages,
272 app.History,
273 app.LSPClients,
274 )
275 if err != nil {
276 slog.Error("Failed to create coder agent", "err", err)
277 return err
278 }
279
280 // Add MCP client cleanup to shutdown process
281 app.cleanupFuncs = append(app.cleanupFuncs, agent.CloseMCPClients)
282
283 setupSubscriber(app.eventsCtx, app.serviceEventsWG, "coderAgent", app.CoderAgent.Subscribe, app.events)
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.CoderAgent != nil {
322 app.CoderAgent.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}