| 1 | package transcript |
| 2 | |
| 3 | import ( |
| 4 | "fmt" |
| 5 | "reasonix/internal/event" |
| 6 | "reasonix/internal/eventwire" |
| 7 | "reasonix/internal/provider" |
| 8 | "slices" |
| 9 | "strings" |
| 10 | ) |
| 11 | |
| 12 | // displayTextAccumulator retains provider chunks without repeatedly copying |
| 13 | // the complete prefix. A turn only materializes the final string when its |
| 14 | // display-only history is persisted; successful executor turns are discarded |
| 15 | // without ever joining their chunks. |
| 16 | type displayTextAccumulator struct { |
| 17 | parts []string |
| 18 | size int |
| 19 | } |
| 20 | |
| 21 | func (a *displayTextAccumulator) append(text string) { |
| 22 | if text == "" { |
| 23 | return |
| 24 | } |
| 25 | a.parts = append(a.parts, text) |
| 26 | a.size += len(text) |
| 27 | } |
| 28 | |
| 29 | func (a *displayTextAccumulator) replace(text string) { |
| 30 | a.parts = nil |
| 31 | a.size = 0 |
| 32 | a.append(text) |
| 33 | } |
| 34 | |
| 35 | func (a *displayTextAccumulator) hasNonWhitespace() bool { |
| 36 | for _, part := range a.parts { |
| 37 | if strings.TrimSpace(part) != "" { |
| 38 | return true |
| 39 | } |
| 40 | } |
| 41 | return false |
| 42 | } |
| 43 | |
| 44 | func (a *displayTextAccumulator) string() string { |
| 45 | switch len(a.parts) { |
| 46 | case 0: |
| 47 | return "" |
| 48 | case 1: |
| 49 | return a.parts[0] |
| 50 | } |
| 51 | var out strings.Builder |
| 52 | out.Grow(a.size) |
| 53 | for _, part := range a.parts { |
| 54 | out.WriteString(part) |
| 55 | } |
| 56 | return out.String() |
| 57 | } |
| 58 | |
| 59 | type bufferedMessage struct { |
| 60 | message Message |
| 61 | content displayTextAccumulator |
| 62 | reasoning displayTextAccumulator |
| 63 | } |
| 64 | |
| 65 | func (m *bufferedMessage) materialize() Message { |
| 66 | out := m.message |
| 67 | if out.Role == "assistant" { |
| 68 | out.Content = m.content.string() |
| 69 | out.Reasoning = m.reasoning.string() |
| 70 | } |
| 71 | if len(out.MemoryCitations) > 0 { |
| 72 | out.MemoryCitations = append([]provider.MemoryCitation(nil), out.MemoryCitations...) |
| 73 | } |
| 74 | if len(out.ToolCalls) > 0 { |
| 75 | out.ToolCalls = append([]ToolCall(nil), out.ToolCalls...) |
| 76 | } |
| 77 | return out |
| 78 | } |
| 79 | |
| 80 | type Buffer struct { |
| 81 | Format Formatter |
| 82 | messages []*bufferedMessage |
| 83 | byMessageID map[string]*bufferedMessage |
| 84 | tools map[string]string |
| 85 | completion *eventwire.CompletionSummary |
| 86 | userTurns int |
| 87 | } |
| 88 | |
| 89 | func (buffer *Buffer) Reset() { |
| 90 | buffer.messages = nil |
| 91 | buffer.byMessageID = nil |
| 92 | buffer.tools = nil |
| 93 | buffer.completion = nil |
| 94 | buffer.userTurns = 0 |
| 95 | } |
| 96 | |
| 97 | func (buffer *Buffer) ResultMessages() []Message { |
| 98 | var out []Message |
| 99 | for _, m := range buffer.messages { |
| 100 | if m.message.Code == "turn_result" { |
| 101 | out = append(out, m.materialize()) |
| 102 | } |
| 103 | } |
| 104 | return out |
| 105 | } |
| 106 | |
| 107 | func (buffer *Buffer) Messages() []Message { |
| 108 | if len(buffer.messages) == 0 { |
| 109 | return nil |
| 110 | } |
| 111 | out := make([]Message, 0, len(buffer.messages)) |
| 112 | for _, message := range buffer.messages { |
| 113 | out = append(out, message.materialize()) |
| 114 | } |
| 115 | return out |
| 116 | } |
| 117 | |
| 118 | func (buffer *Buffer) attachTurnStats(turnID string, usage *TurnUsage, durationMs, completedAt int64, finalMessageID string) { |
| 119 | for _, row := range slices.Backward(buffer.messages) { |
| 120 | if row.message.TurnID != turnID || row.message.Role != "assistant" { |
| 121 | continue |
| 122 | } |
| 123 | if finalMessageID != "" && row.message.MessageID != finalMessageID { |
| 124 | continue |
| 125 | } |
| 126 | if !row.content.hasNonWhitespace() && !row.reasoning.hasNonWhitespace() { |
| 127 | continue |
| 128 | } |
| 129 | if usage != nil { |
| 130 | copy := *usage |
| 131 | copy.Routes = append([]string(nil), usage.Routes...) |
| 132 | if usage.CacheReadTokens != nil { |
| 133 | value := *usage.CacheReadTokens |
| 134 | copy.CacheReadTokens = &value |
| 135 | } |
| 136 | if usage.ReasoningTokens != nil { |
| 137 | value := *usage.ReasoningTokens |
| 138 | copy.ReasoningTokens = &value |
| 139 | } |
| 140 | row.message.TurnUsage = © |
| 141 | } |
| 142 | row.message.TurnDurationMs = durationMs |
| 143 | if row.message.CreatedAt == 0 { |
| 144 | row.message.CreatedAt = completedAt |
| 145 | } |
| 146 | return |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | func (buffer *Buffer) Apply(e event.Event) { |
| 151 | start := len(buffer.messages) |
| 152 | defer buffer.stampAppliedMessages(e, start) |
| 153 | switch e.Kind { |
| 154 | case event.UserMessage: |
| 155 | buffer.applyUserMessage(e) |
| 156 | case event.StreamAttempt: |
| 157 | buffer.applyStreamAttempt(e) |
| 158 | case event.CompletionSummary: |
| 159 | buffer.completion = eventwire.ToWire(e).Completion |
| 160 | case event.TurnDone: |
| 161 | buffer.applyTurnDone(e) |
| 162 | case event.Phase: |
| 163 | if strings.TrimSpace(e.Text) != "" { |
| 164 | buffer.messages = append(buffer.messages, &bufferedMessage{message: Message{Role: "phase", Content: e.Text}}) |
| 165 | } |
| 166 | case event.Reasoning: |
| 167 | if e.Text != "" { |
| 168 | ensureIdentifiedDisplayAssistant(buffer, e.MessageID, false).reasoning.append(e.Text) |
| 169 | } |
| 170 | case event.Text: |
| 171 | if e.Text != "" { |
| 172 | ensureIdentifiedDisplayAssistant(buffer, e.MessageID, false).content.append(e.Text) |
| 173 | } |
| 174 | case event.Message: |
| 175 | buffer.applyAssistantMessage(e) |
| 176 | case event.ToolDispatch: |
| 177 | recordHistoryToolDispatch(buffer, e) |
| 178 | case event.ToolResult: |
| 179 | buffer.applyToolResult(e) |
| 180 | case event.Notice: |
| 181 | buffer.applyNotice(e) |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | func (buffer *Buffer) stampAppliedMessages(e event.Event, start int) { |
| 186 | for i := start; i < len(buffer.messages); i++ { |
| 187 | m := &buffer.messages[i].message |
| 188 | m.Source, m.TurnID = e.Source, e.TurnID |
| 189 | if m.RecordID == "" { |
| 190 | switch { |
| 191 | case m.Role == "tool" && m.ToolCallID != "": |
| 192 | m.RecordID = "tool:" + m.ToolCallID |
| 193 | case m.MessageID != "": |
| 194 | m.RecordID = "m:" + m.MessageID |
| 195 | case e.Sequence > 0: |
| 196 | m.RecordID = fmt.Sprintf("e:%s:%d:%d", e.TurnID, e.Sequence, i-start) |
| 197 | } |
| 198 | } |
| 199 | } |
| 200 | } |
| 201 | |
| 202 | func (buffer *Buffer) applyUserMessage(e event.Event) { |
| 203 | if e.Source != "" && e.Source != event.UsageSourceExecutor { |
| 204 | return |
| 205 | } |
| 206 | if e.MessageID != "" && buffer.byMessageID[e.MessageID] == nil { |
| 207 | if buffer.byMessageID == nil { |
| 208 | buffer.byMessageID = make(map[string]*bufferedMessage) |
| 209 | } |
| 210 | m := &bufferedMessage{message: Message{Role: "user", MessageID: e.MessageID, Content: e.Text}} |
| 211 | buffer.userTurns++ |
| 212 | m.message.HistoryTurn = buffer.userTurns |
| 213 | buffer.messages = append(buffer.messages, m) |
| 214 | buffer.byMessageID[e.MessageID] = m |
| 215 | } |
| 216 | } |
| 217 | |
| 218 | func (buffer *Buffer) applyStreamAttempt(e event.Event) { |
| 219 | if e.StreamAttempt.Action == event.StreamAttemptDiscard && e.MessageID != "" { |
| 220 | kept := buffer.messages[:0] |
| 221 | for _, message := range buffer.messages { |
| 222 | if message.message.MessageID != e.MessageID { |
| 223 | kept = append(kept, message) |
| 224 | } |
| 225 | } |
| 226 | clear(buffer.messages[len(kept):]) |
| 227 | buffer.messages = kept |
| 228 | delete(buffer.byMessageID, e.MessageID) |
| 229 | } |
| 230 | if e.MessageID != "" && e.StreamAttempt.Action == event.StreamAttemptBegin { |
| 231 | m := ensureIdentifiedDisplayAssistant(buffer, e.MessageID, false) |
| 232 | m.message.AttemptID, m.message.Pending = e.AttemptID, true |
| 233 | } |
| 234 | if e.MessageID != "" && e.StreamAttempt.Action == event.StreamAttemptCommit { |
| 235 | if m := buffer.byMessageID[e.MessageID]; m != nil { |
| 236 | m.message.Pending = false |
| 237 | } |
| 238 | } |
| 239 | } |
| 240 | |
| 241 | func (buffer *Buffer) applyTurnDone(e event.Event) { |
| 242 | for _, m := range buffer.messages { |
| 243 | m.message.Pending = false |
| 244 | if m.message.Role == "user" && m.message.TurnID == e.TurnID { |
| 245 | m.message.CheckpointTurn = e.CheckpointTurn |
| 246 | } |
| 247 | for i := range m.message.ToolCalls { |
| 248 | m.message.ToolCalls[i].Pending = false |
| 249 | } |
| 250 | } |
| 251 | wire := eventwire.ToWire(e) |
| 252 | if wire.Receipt != nil || buffer.completion != nil { |
| 253 | buffer.messages = append(buffer.messages, &bufferedMessage{message: Message{ |
| 254 | Role: "notice", Code: "turn_result", Level: "info", TurnID: e.TurnID, |
| 255 | CompletionReceipt: wire.Receipt, CompletionSummary: buffer.completion, CheckpointTurn: e.CheckpointTurn, |
| 256 | }}) |
| 257 | } |
| 258 | } |
| 259 | |
| 260 | func (buffer *Buffer) applyAssistantMessage(e event.Event) { |
| 261 | if e.Text == "" && e.Reasoning == "" && len(e.MemoryCitations) == 0 { |
| 262 | return |
| 263 | } |
| 264 | hm := ensureIdentifiedDisplayAssistant(buffer, e.MessageID, false) |
| 265 | if e.Text != "" { |
| 266 | hm.content.replace(e.Text) |
| 267 | } |
| 268 | if e.Reasoning != "" { |
| 269 | hm.reasoning.replace(e.Reasoning) |
| 270 | } |
| 271 | if len(e.MemoryCitations) > 0 { |
| 272 | hm.message.MemoryCitations = append([]provider.MemoryCitation(nil), e.MemoryCitations...) |
| 273 | } |
| 274 | } |
| 275 | |
| 276 | func (buffer *Buffer) applyToolResult(e event.Event) { |
| 277 | callID := strings.TrimSpace(e.Tool.ID) |
| 278 | content := firstNonEmpty(e.Tool.Output, e.Tool.Err) |
| 279 | display, errPreview := buffer.Format.result(content, e.Tool.Err != "") |
| 280 | if callID != "" { |
| 281 | updateBufferedToolCallSummary(buffer, callID, content) |
| 282 | for _, row := range buffer.messages { |
| 283 | for i := range row.message.ToolCalls { |
| 284 | if row.message.ToolCalls[i].ID == callID { |
| 285 | row.message.ToolCalls[i].Pending = false |
| 286 | } |
| 287 | } |
| 288 | } |
| 289 | } |
| 290 | toolName := e.Tool.Name |
| 291 | if toolName == "" && buffer.tools != nil { |
| 292 | toolName = buffer.tools[callID] |
| 293 | } |
| 294 | result := Message{ |
| 295 | Role: "tool", |
| 296 | ToolCallID: callID, |
| 297 | ToolName: toolName, |
| 298 | Content: display, |
| 299 | ToolResultError: errPreview, |
| 300 | PresentedFiles: append([]provider.PresentedFile(nil), e.Tool.PresentedFiles...), |
| 301 | } |
| 302 | if callID != "" { |
| 303 | for _, row := range buffer.messages { |
| 304 | if row.message.Role == "tool" && row.message.ToolCallID == callID { |
| 305 | // ToolResult is a completion delta, not a replacement canonical |
| 306 | // message. Preserve formal identity and update only event-owned |
| 307 | // fields; e.MessageID may identify the owning assistant message. |
| 308 | row.message.Content = display |
| 309 | row.message.ToolResultError = errPreview |
| 310 | row.message.Pending = false |
| 311 | if toolName != "" { |
| 312 | row.message.ToolName = toolName |
| 313 | } |
| 314 | if len(e.Tool.PresentedFiles) > 0 { |
| 315 | row.message.PresentedFiles = append([]provider.PresentedFile(nil), e.Tool.PresentedFiles...) |
| 316 | } |
| 317 | return |
| 318 | } |
| 319 | } |
| 320 | } |
| 321 | buffer.messages = append(buffer.messages, &bufferedMessage{message: result}) |
| 322 | } |
| 323 | |
| 324 | func (buffer *Buffer) applyNotice(e event.Event) { |
| 325 | if strings.TrimSpace(e.Text) == "" { |
| 326 | return |
| 327 | } |
| 328 | recordID := "" |
| 329 | if e.Code == event.NoticeCodeUnappliedSteer && e.MessageID != "" { |
| 330 | recordID = unappliedSteerRecordID(e.MessageID) |
| 331 | for _, row := range buffer.messages { |
| 332 | if row.message.RecordID == recordID && row.message.Role == "notice" { |
| 333 | return |
| 334 | } |
| 335 | } |
| 336 | } |
| 337 | level := "info" |
| 338 | if e.Level == event.LevelWarn { |
| 339 | level = "warn" |
| 340 | } |
| 341 | buffer.messages = append(buffer.messages, &bufferedMessage{message: Message{ |
| 342 | Role: "notice", |
| 343 | RecordID: recordID, |
| 344 | MessageID: e.MessageID, |
| 345 | Level: level, |
| 346 | Content: e.Text, |
| 347 | Detail: e.Detail, |
| 348 | Code: e.Code, |
| 349 | DecisionReceipt: cloneDecisionReceipt(e.DecisionReceipt), |
| 350 | }}) |
| 351 | } |
| 352 | |
| 353 | func recordHistoryToolDispatch(buffer *Buffer, e event.Event) { |
| 354 | if strings.TrimSpace(e.Tool.Name) == "" && e.Tool.ID == "" { |
| 355 | return |
| 356 | } |
| 357 | hm := ensureIdentifiedDisplayAssistant(buffer, e.MessageID, true) |
| 358 | resolvedReadOnly := e.Tool.ReadOnly |
| 359 | call := ToolCall{ |
| 360 | Partial: e.Tool.Partial, |
| 361 | ArgChars: e.Tool.ArgChars, |
| 362 | Pending: true, |
| 363 | ParentID: e.Tool.ParentID, |
| 364 | StartedAt: e.Tool.StartedAt, |
| 365 | ID: e.Tool.ID, |
| 366 | Name: e.Tool.Name, |
| 367 | Arguments: e.Tool.Args, |
| 368 | ResolvedName: e.Tool.ResolvedName, |
| 369 | CapabilityID: e.Tool.CapabilityID, |
| 370 | ResolvedReadOnly: &resolvedReadOnly, |
| 371 | Subject: buffer.Format.subject(e.Tool.Name, e.Tool.Args), |
| 372 | Summary: buffer.Format.summary(e.Tool.Name, e.Tool.Args, ""), |
| 373 | Diff: e.Tool.Diff, |
| 374 | Added: e.Tool.Added, |
| 375 | Removed: e.Tool.Removed, |
| 376 | } |
| 377 | replaced := false |
| 378 | if call.ID != "" { |
| 379 | for i := range hm.message.ToolCalls { |
| 380 | if hm.message.ToolCalls[i].ID == call.ID { |
| 381 | if call.Partial { |
| 382 | previous := hm.message.ToolCalls[i] |
| 383 | // A progress update cannot reopen a committed invocation. |
| 384 | if !previous.Partial { |
| 385 | return |
| 386 | } |
| 387 | if call.Name == "" { |
| 388 | call.Name = previous.Name |
| 389 | } |
| 390 | if call.Arguments == "" { |
| 391 | call.Arguments = previous.Arguments |
| 392 | } |
| 393 | } |
| 394 | hm.message.ToolCalls[i] = call |
| 395 | replaced = true |
| 396 | break |
| 397 | } |
| 398 | } |
| 399 | if buffer.tools == nil { |
| 400 | buffer.tools = map[string]string{} |
| 401 | } |
| 402 | buffer.tools[call.ID] = call.Name |
| 403 | } |
| 404 | if !replaced { |
| 405 | hm.message.ToolCalls = append(hm.message.ToolCalls, call) |
| 406 | } |
| 407 | } |
| 408 | |
| 409 | func ensureIdentifiedDisplayAssistant(buffer *Buffer, messageID string, tool bool) *bufferedMessage { |
| 410 | if messageID == "" { |
| 411 | if tool { |
| 412 | return ensureDisplayAssistantForTool(buffer) |
| 413 | } |
| 414 | return ensureDisplayAssistant(buffer) |
| 415 | } |
| 416 | if existing := buffer.byMessageID[messageID]; existing != nil { |
| 417 | return existing |
| 418 | } |
| 419 | if buffer.byMessageID == nil { |
| 420 | buffer.byMessageID = make(map[string]*bufferedMessage) |
| 421 | } |
| 422 | message := &bufferedMessage{message: Message{MessageID: messageID, Role: "assistant"}} |
| 423 | buffer.messages = append(buffer.messages, message) |
| 424 | buffer.byMessageID[messageID] = message |
| 425 | return message |
| 426 | } |
| 427 | func ensureDisplayAssistant(buffer *Buffer) *bufferedMessage { |
| 428 | if n := len(buffer.messages); n > 0 && buffer.messages[n-1].message.Role == "assistant" { |
| 429 | return buffer.messages[n-1] |
| 430 | } |
| 431 | message := &bufferedMessage{message: Message{Role: "assistant"}} |
| 432 | buffer.messages = append(buffer.messages, message) |
| 433 | return message |
| 434 | } |
| 435 | |
| 436 | func ensureDisplayAssistantForTool(buffer *Buffer) *bufferedMessage { |
| 437 | if n := len(buffer.messages); n > 0 && buffer.messages[n-1].message.Role == "assistant" && !buffer.messages[n-1].content.hasNonWhitespace() { |
| 438 | return buffer.messages[n-1] |
| 439 | } |
| 440 | message := &bufferedMessage{message: Message{Role: "assistant"}} |
| 441 | buffer.messages = append(buffer.messages, message) |
| 442 | return message |
| 443 | } |
| 444 | |
| 445 | func updateBufferedToolCallSummary(buffer *Buffer, callID, output string) { |
| 446 | if callID == "" { |
| 447 | return |
| 448 | } |
| 449 | for _, v := range slices.Backward(buffer.messages) { |
| 450 | for j := range v.message.ToolCalls { |
| 451 | call := &v.message.ToolCalls[j] |
| 452 | if call.ID != callID { |
| 453 | continue |
| 454 | } |
| 455 | if call.Summary == "" { |
| 456 | call.Summary = buffer.Format.summary(call.Name, call.Arguments, output) |
| 457 | } |
| 458 | return |
| 459 | } |
| 460 | } |
| 461 | } |
| 462 | |
| 463 | type Formatter struct { |
| 464 | ToolSubject func(name, args string) string |
| 465 | ToolSummary func(name, args, output string) string |
| 466 | ToolResult func(content string, failed bool) (string, string) |
| 467 | } |
| 468 | |
| 469 | func (f Formatter) subject(name, args string) string { |
| 470 | if f.ToolSubject != nil { |
| 471 | return f.ToolSubject(name, args) |
| 472 | } |
| 473 | return "" |
| 474 | } |
| 475 | func (f Formatter) summary(name, args, output string) string { |
| 476 | if f.ToolSummary != nil { |
| 477 | return f.ToolSummary(name, args, output) |
| 478 | } |
| 479 | return "" |
| 480 | } |
| 481 | func (f Formatter) result(content string, failed bool) (string, string) { |
| 482 | if f.ToolResult != nil { |
| 483 | return f.ToolResult(content, failed) |
| 484 | } |
| 485 | if failed { |
| 486 | return content, content |
| 487 | } |
| 488 | return content, "" |
| 489 | } |
| 490 | func (buffer *Buffer) ResetToolsIfEmpty() { |
| 491 | if len(buffer.messages) == 0 { |
| 492 | buffer.tools = nil |
| 493 | } |
| 494 | } |
| 495 | func firstNonEmpty(values ...string) string { |
| 496 | for _, value := range values { |
| 497 | if value != "" { |
| 498 | return value |
| 499 | } |
| 500 | } |
| 501 | return "" |
| 502 | } |
| 503 | func cloneDecisionReceipt(in *provider.DecisionReceipt) *provider.DecisionReceipt { |
| 504 | if in == nil { |
| 505 | return nil |
| 506 | } |
| 507 | out := *in |
| 508 | return &out |
| 509 | } |
| 510 |