1package app
2
3import (
4 "context"
5 "database/sql"
6 "errors"
7 "fmt"
8 "log/slog"
9 "sync"
10 "time"
11
12 "charm.land/fantasy"
13 tea "github.com/charmbracelet/bubbletea/v2"
14 "github.com/charmbracelet/crush/internal/agent"
15 "github.com/charmbracelet/crush/internal/agent/tools"
16 "github.com/charmbracelet/crush/internal/config"
17 "github.com/charmbracelet/crush/internal/csync"
18 "github.com/charmbracelet/crush/internal/db"
19 "github.com/charmbracelet/crush/internal/format"
20 "github.com/charmbracelet/crush/internal/history"
21 "github.com/charmbracelet/crush/internal/log"
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/pubsub"
26 "github.com/charmbracelet/crush/internal/session"
27 "github.com/charmbracelet/x/ansi"
28)
29
30type App struct {
31 Sessions session.Service
32 Messages message.Service
33 History history.Service
34 Permissions permission.Service
35
36 AgentCoordinator agent.Coordinator
37
38 LSPClients *csync.Map[string, *lsp.Client]
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: csync.NewMap[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 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 type response struct {
148 result *fantasy.AgentResult
149 err error
150 }
151 done := make(chan response, 1)
152
153 go func(ctx context.Context, sessionID, prompt string) {
154 result, err := app.AgentCoordinator.Run(ctx, sess.ID, prompt)
155 if err != nil {
156 done <- response{
157 err: fmt.Errorf("failed to start agent processing stream: %w", err),
158 }
159 }
160 done <- response{
161 result: result,
162 }
163 }(ctx, sess.ID, prompt)
164
165 messageEvents := app.Messages.Subscribe(ctx)
166 messageReadBytes := make(map[string]int)
167
168 defer fmt.Printf(ansi.ResetProgressBar)
169 for {
170 // HACK: add it again on every iteration so it doesn't get hidden by
171 // the terminal due to inactivity.
172 fmt.Printf(ansi.SetIndeterminateProgressBar)
173 select {
174 case result := <-done:
175 stopSpinner()
176 if result.err != nil {
177 if errors.Is(result.err, context.Canceled) || errors.Is(result.err, agent.ErrRequestCancelled) {
178 slog.Info("Non-interactive: agent processing cancelled", "session_id", sess.ID)
179 return nil
180 }
181 return fmt.Errorf("agent processing failed: %w", result.err)
182 }
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.AgentCoordinator.UpdateModels()
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", tools.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[config.AgentCoder]
267 if coderAgentCfg.ID == "" {
268 return fmt.Errorf("coder agent configuration is missing")
269 }
270 var err error
271 app.AgentCoordinator, err = agent.NewCoordinator(
272 app.config,
273 app.Sessions,
274 app.Messages,
275 app.Permissions,
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, tools.CloseMCPClients)
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.AgentCoordinator != nil {
324 app.AgentCoordinator.CancelAll()
325 }
326
327 // Shutdown all LSP clients.
328 for name, client := range app.LSPClients.Seq2() {
329 shutdownCtx, cancel := context.WithTimeout(app.globalCtx, 5*time.Second)
330 if err := client.Close(shutdownCtx); err != nil {
331 slog.Error("Failed to shutdown LSP client", "name", name, "error", err)
332 }
333 cancel()
334 }
335
336 // Call call cleanup functions.
337 for _, cleanup := range app.cleanupFuncs {
338 if cleanup != nil {
339 if err := cleanup(); err != nil {
340 slog.Error("Failed to cleanup app properly on shutdown", "error", err)
341 }
342 }
343 }
344}