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 // TODO: (kujtim) remove this when fully implemented
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 // cleanup database upon app shutdown
85 app.cleanupFuncs = append(app.cleanupFuncs, conn.Close)
86
87 // TODO: remove the concept of agent config, most likely.
88 if cfg.IsConfigured() {
89 if err := app.InitCoderAgent(); err != nil {
90 return nil, fmt.Errorf("failed to initialize coder agent: %w", err)
91 }
92 } else {
93 slog.Warn("No agent configuration found")
94 }
95 return app, nil
96}
97
98// Config returns the application configuration.
99func (app *App) Config() *config.Config {
100 return app.config
101}
102
103// RunNonInteractive handles the execution flow when a prompt is provided via
104// CLI flag.
105func (app *App) RunNonInteractive(ctx context.Context, prompt string, quiet bool) error {
106 slog.Info("Running in non-interactive mode")
107
108 ctx, cancel := context.WithCancel(ctx)
109 defer cancel()
110
111 // Start spinner if not in quiet mode.
112 var spinner *format.Spinner
113 if !quiet {
114 spinner = format.NewSpinner(ctx, cancel, "Generating")
115 spinner.Start()
116 }
117
118 // Helper function to stop spinner once.
119 stopSpinner := func() {
120 if !quiet && spinner != nil {
121 spinner.Stop()
122 spinner = nil
123 }
124 }
125 defer stopSpinner()
126
127 const maxPromptLengthForTitle = 100
128 titlePrefix := "Non-interactive: "
129 var titleSuffix string
130
131 if len(prompt) > maxPromptLengthForTitle {
132 titleSuffix = prompt[:maxPromptLengthForTitle] + "..."
133 } else {
134 titleSuffix = prompt
135 }
136 title := titlePrefix + titleSuffix
137
138 sess, err := app.Sessions.Create(ctx, title)
139 if err != nil {
140 return fmt.Errorf("failed to create session for non-interactive mode: %w", err)
141 }
142 slog.Info("Created session for non-interactive run", "session_id", sess.ID)
143
144 // Automatically approve all permission requests for this non-interactive session
145 app.Permissions.AutoApproveSession(sess.ID)
146
147 done, err := app.CoderAgent.Run(ctx, sess.ID, prompt)
148 if err != nil {
149 return fmt.Errorf("failed to start agent processing stream: %w", err)
150 }
151
152 messageEvents := app.Messages.Subscribe(ctx)
153 messageReadBytes := make(map[string]int)
154
155 for {
156 select {
157 case result := <-done:
158 stopSpinner()
159
160 if result.Error != nil {
161 if errors.Is(result.Error, context.Canceled) || errors.Is(result.Error, agent.ErrRequestCancelled) {
162 slog.Info("Non-interactive: agent processing cancelled", "session_id", sess.ID)
163 return nil
164 }
165 return fmt.Errorf("agent processing failed: %w", result.Error)
166 }
167
168 msgContent := result.Message.Content().String()
169 readBts := messageReadBytes[result.Message.ID]
170
171 if len(msgContent) < readBts {
172 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(msgContent), "read_bytes", readBts)
173 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(msgContent), readBts)
174 }
175 fmt.Println(msgContent[readBts:])
176 messageReadBytes[result.Message.ID] = len(msgContent)
177
178 slog.Info("Non-interactive: run completed", "session_id", sess.ID)
179 return nil
180
181 case event := <-messageEvents:
182 msg := event.Payload
183 if msg.SessionID == sess.ID && msg.Role == message.Assistant && len(msg.Parts) > 0 {
184 stopSpinner()
185
186 content := msg.Content().String()
187 readBytes := messageReadBytes[msg.ID]
188
189 if len(content) < readBytes {
190 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(content), "read_bytes", readBytes)
191 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(content), readBytes)
192 }
193
194 part := content[readBytes:]
195 fmt.Print(part)
196 messageReadBytes[msg.ID] = len(content)
197 }
198
199 case <-ctx.Done():
200 stopSpinner()
201 return ctx.Err()
202 }
203 }
204}
205
206func (app *App) UpdateAgentModel() error {
207 return app.CoderAgent.UpdateModel()
208}
209
210func (app *App) setupEvents() {
211 ctx, cancel := context.WithCancel(app.globalCtx)
212 app.eventsCtx = ctx
213 setupSubscriber(ctx, app.serviceEventsWG, "sessions", app.Sessions.Subscribe, app.events)
214 setupSubscriber(ctx, app.serviceEventsWG, "messages", app.Messages.Subscribe, app.events)
215 setupSubscriber(ctx, app.serviceEventsWG, "permissions", app.Permissions.Subscribe, app.events)
216 setupSubscriber(ctx, app.serviceEventsWG, "permissions-notifications", app.Permissions.SubscribeNotifications, app.events)
217 setupSubscriber(ctx, app.serviceEventsWG, "history", app.History.Subscribe, app.events)
218 setupSubscriber(ctx, app.serviceEventsWG, "mcp", agent.SubscribeMCPEvents, app.events)
219 setupSubscriber(ctx, app.serviceEventsWG, "lsp", SubscribeLSPEvents, app.events)
220 cleanupFunc := func() error {
221 cancel()
222 app.serviceEventsWG.Wait()
223 return nil
224 }
225 app.cleanupFuncs = append(app.cleanupFuncs, cleanupFunc)
226}
227
228func setupSubscriber[T any](
229 ctx context.Context,
230 wg *sync.WaitGroup,
231 name string,
232 subscriber func(context.Context) <-chan pubsub.Event[T],
233 outputCh chan<- tea.Msg,
234) {
235 wg.Go(func() {
236 subCh := subscriber(ctx)
237 for {
238 select {
239 case event, ok := <-subCh:
240 if !ok {
241 slog.Debug("subscription channel closed", "name", name)
242 return
243 }
244 var msg tea.Msg = event
245 select {
246 case outputCh <- msg:
247 case <-time.After(2 * time.Second):
248 slog.Warn("message dropped due to slow consumer", "name", name)
249 case <-ctx.Done():
250 slog.Debug("subscription cancelled", "name", name)
251 return
252 }
253 case <-ctx.Done():
254 slog.Debug("subscription cancelled", "name", name)
255 return
256 }
257 }
258 })
259}
260
261func (app *App) InitCoderAgent() error {
262 coderAgentCfg := app.config.Agents["coder"]
263 if coderAgentCfg.ID == "" {
264 return fmt.Errorf("coder agent configuration is missing")
265 }
266 var err error
267 app.CoderAgent, err = agent.NewAgent(
268 app.globalCtx,
269 coderAgentCfg,
270 app.Permissions,
271 app.Sessions,
272 app.Messages,
273 app.History,
274 app.LSPClients,
275 )
276 if err != nil {
277 slog.Error("Failed to create coder agent", "err", err)
278 return err
279 }
280
281 // Add MCP client cleanup to shutdown process
282 app.cleanupFuncs = append(app.cleanupFuncs, agent.CloseMCPClients)
283
284 setupSubscriber(app.eventsCtx, app.serviceEventsWG, "coderAgent", app.CoderAgent.Subscribe, app.events)
285 return nil
286}
287
288// Subscribe sends events to the TUI as tea.Msgs.
289func (app *App) Subscribe(program *tea.Program) {
290 defer log.RecoverPanic("app.Subscribe", func() {
291 slog.Info("TUI subscription panic: attempting graceful shutdown")
292 program.Quit()
293 })
294
295 app.tuiWG.Add(1)
296 tuiCtx, tuiCancel := context.WithCancel(app.globalCtx)
297 app.cleanupFuncs = append(app.cleanupFuncs, func() error {
298 slog.Debug("Cancelling TUI message handler")
299 tuiCancel()
300 app.tuiWG.Wait()
301 return nil
302 })
303 defer app.tuiWG.Done()
304
305 for {
306 select {
307 case <-tuiCtx.Done():
308 slog.Debug("TUI message handler shutting down")
309 return
310 case msg, ok := <-app.events:
311 if !ok {
312 slog.Debug("TUI message channel closed")
313 return
314 }
315 program.Send(msg)
316 }
317 }
318}
319
320// Shutdown performs a graceful shutdown of the application.
321func (app *App) Shutdown() {
322 if app.CoderAgent != nil {
323 app.CoderAgent.CancelAll()
324 }
325
326 // Shutdown all LSP clients.
327 for name, client := range app.LSPClients.Seq2() {
328 shutdownCtx, cancel := context.WithTimeout(app.globalCtx, 5*time.Second)
329 if err := client.Close(shutdownCtx); err != nil {
330 slog.Error("Failed to shutdown LSP client", "name", name, "error", err)
331 }
332 cancel()
333 }
334
335 // Call call cleanup functions.
336 for _, cleanup := range app.cleanupFuncs {
337 if cleanup != nil {
338 if err := cleanup(); err != nil {
339 slog.Error("Failed to cleanup app properly on shutdown", "error", err)
340 }
341 }
342 }
343}