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// Events returns the application's event channel.
98func (app *App) Events() <-chan tea.Msg {
99 return app.events
100}
101
102// Config returns the application configuration.
103func (app *App) Config() *config.Config {
104 return app.config
105}
106
107// RunNonInteractive handles the execution flow when a prompt is provided via
108// CLI flag.
109func (app *App) RunNonInteractive(ctx context.Context, prompt string, quiet bool) error {
110 slog.Info("Running in non-interactive mode")
111
112 ctx, cancel := context.WithCancel(ctx)
113 defer cancel()
114
115 // Start spinner if not in quiet mode.
116 var spinner *format.Spinner
117 if !quiet {
118 spinner = format.NewSpinner(ctx, cancel, "Generating")
119 spinner.Start()
120 }
121
122 // Helper function to stop spinner once.
123 stopSpinner := func() {
124 if !quiet && spinner != nil {
125 spinner.Stop()
126 spinner = nil
127 }
128 }
129 defer stopSpinner()
130
131 const maxPromptLengthForTitle = 100
132 titlePrefix := "Non-interactive: "
133 var titleSuffix string
134
135 if len(prompt) > maxPromptLengthForTitle {
136 titleSuffix = prompt[:maxPromptLengthForTitle] + "..."
137 } else {
138 titleSuffix = prompt
139 }
140 title := titlePrefix + titleSuffix
141
142 sess, err := app.Sessions.Create(ctx, title)
143 if err != nil {
144 return fmt.Errorf("failed to create session for non-interactive mode: %w", err)
145 }
146 slog.Info("Created session for non-interactive run", "session_id", sess.ID)
147
148 // Automatically approve all permission requests for this non-interactive session
149 app.Permissions.AutoApproveSession(sess.ID)
150
151 done, err := app.CoderAgent.Run(ctx, sess.ID, prompt)
152 if err != nil {
153 return fmt.Errorf("failed to start agent processing stream: %w", err)
154 }
155
156 messageEvents := app.Messages.Subscribe(ctx)
157 messageReadBytes := make(map[string]int)
158
159 for {
160 select {
161 case result := <-done:
162 stopSpinner()
163
164 if result.Error != nil {
165 if errors.Is(result.Error, context.Canceled) || errors.Is(result.Error, agent.ErrRequestCancelled) {
166 slog.Info("Non-interactive: agent processing cancelled", "session_id", sess.ID)
167 return nil
168 }
169 return fmt.Errorf("agent processing failed: %w", result.Error)
170 }
171
172 msgContent := result.Message.Content().String()
173 readBts := messageReadBytes[result.Message.ID]
174
175 if len(msgContent) < readBts {
176 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(msgContent), "read_bytes", readBts)
177 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(msgContent), readBts)
178 }
179 fmt.Println(msgContent[readBts:])
180 messageReadBytes[result.Message.ID] = len(msgContent)
181
182 slog.Info("Non-interactive: run completed", "session_id", sess.ID)
183 return nil
184
185 case event := <-messageEvents:
186 msg := event.Payload
187 if msg.SessionID == sess.ID && msg.Role == message.Assistant && len(msg.Parts) > 0 {
188 stopSpinner()
189
190 content := msg.Content().String()
191 readBytes := messageReadBytes[msg.ID]
192
193 if len(content) < readBytes {
194 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(content), "read_bytes", readBytes)
195 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(content), readBytes)
196 }
197
198 part := content[readBytes:]
199 fmt.Print(part)
200 messageReadBytes[msg.ID] = len(content)
201 }
202
203 case <-ctx.Done():
204 stopSpinner()
205 return ctx.Err()
206 }
207 }
208}
209
210func (app *App) UpdateAgentModel() error {
211 return app.CoderAgent.UpdateModel()
212}
213
214func (app *App) setupEvents() {
215 ctx, cancel := context.WithCancel(app.globalCtx)
216 app.eventsCtx = ctx
217 setupSubscriber(ctx, app.serviceEventsWG, "sessions", app.Sessions.Subscribe, app.events)
218 setupSubscriber(ctx, app.serviceEventsWG, "messages", app.Messages.Subscribe, app.events)
219 setupSubscriber(ctx, app.serviceEventsWG, "permissions", app.Permissions.Subscribe, app.events)
220 setupSubscriber(ctx, app.serviceEventsWG, "permissions-notifications", app.Permissions.SubscribeNotifications, app.events)
221 setupSubscriber(ctx, app.serviceEventsWG, "history", app.History.Subscribe, app.events)
222 setupSubscriber(ctx, app.serviceEventsWG, "mcp", agent.SubscribeMCPEvents, app.events)
223 setupSubscriber(ctx, app.serviceEventsWG, "lsp", SubscribeLSPEvents, app.events)
224 cleanupFunc := func() error {
225 cancel()
226 app.serviceEventsWG.Wait()
227 return nil
228 }
229 app.cleanupFuncs = append(app.cleanupFuncs, cleanupFunc)
230}
231
232func setupSubscriber[T any](
233 ctx context.Context,
234 wg *sync.WaitGroup,
235 name string,
236 subscriber func(context.Context) <-chan pubsub.Event[T],
237 outputCh chan<- tea.Msg,
238) {
239 wg.Go(func() {
240 subCh := subscriber(ctx)
241 for {
242 select {
243 case event, ok := <-subCh:
244 if !ok {
245 slog.Debug("subscription channel closed", "name", name)
246 return
247 }
248 var msg tea.Msg = event
249 select {
250 case outputCh <- msg:
251 case <-time.After(2 * time.Second):
252 slog.Warn("message dropped due to slow consumer", "name", name)
253 case <-ctx.Done():
254 slog.Debug("subscription cancelled", "name", name)
255 return
256 }
257 case <-ctx.Done():
258 slog.Debug("subscription cancelled", "name", name)
259 return
260 }
261 }
262 })
263}
264
265func (app *App) InitCoderAgent() error {
266 coderAgentCfg := app.config.Agents["coder"]
267 if coderAgentCfg.ID == "" {
268 return fmt.Errorf("coder agent configuration is missing")
269 }
270 var err error
271 app.CoderAgent, err = agent.NewAgent(
272 app.globalCtx,
273 coderAgentCfg,
274 app.Permissions,
275 app.Sessions,
276 app.Messages,
277 app.History,
278 app.LSPClients,
279 )
280 if err != nil {
281 slog.Error("Failed to create coder agent", "err", err)
282 return err
283 }
284
285 // Add MCP client cleanup to shutdown process
286 app.cleanupFuncs = append(app.cleanupFuncs, agent.CloseMCPClients)
287
288 setupSubscriber(app.eventsCtx, app.serviceEventsWG, "coderAgent", app.CoderAgent.Subscribe, app.events)
289 return nil
290}
291
292// Subscribe sends events to the TUI as tea.Msgs.
293func (app *App) Subscribe(program *tea.Program) {
294 defer log.RecoverPanic("app.Subscribe", func() {
295 slog.Info("TUI subscription panic: attempting graceful shutdown")
296 program.Quit()
297 })
298
299 app.tuiWG.Add(1)
300 tuiCtx, tuiCancel := context.WithCancel(app.globalCtx)
301 app.cleanupFuncs = append(app.cleanupFuncs, func() error {
302 slog.Debug("Cancelling TUI message handler")
303 tuiCancel()
304 app.tuiWG.Wait()
305 return nil
306 })
307 defer app.tuiWG.Done()
308
309 for {
310 select {
311 case <-tuiCtx.Done():
312 slog.Debug("TUI message handler shutting down")
313 return
314 case msg, ok := <-app.events:
315 if !ok {
316 slog.Debug("TUI message channel closed")
317 return
318 }
319 program.Send(msg)
320 }
321 }
322}
323
324// Shutdown performs a graceful shutdown of the application.
325func (app *App) Shutdown() {
326 if app.CoderAgent != nil {
327 app.CoderAgent.CancelAll()
328 }
329
330 // Shutdown all LSP clients.
331 for name, client := range app.LSPClients.Seq2() {
332 shutdownCtx, cancel := context.WithTimeout(app.globalCtx, 5*time.Second)
333 if err := client.Close(shutdownCtx); err != nil {
334 slog.Error("Failed to shutdown LSP client", "name", name, "error", err)
335 }
336 cancel()
337 }
338
339 // Call call cleanup functions.
340 for _, cleanup := range app.cleanupFuncs {
341 if cleanup != nil {
342 if err := cleanup(); err != nil {
343 slog.Error("Failed to cleanup app properly on shutdown", "error", err)
344 }
345 }
346 }
347}