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