Harden conversation replies and prioritize newest candidates

src/services/conversation-boundaries.ts

@@ -0,0 +1,70 @@
+export interface BoundaryMessage {
+  text: string;
+  isSelf: boolean;
+}
+
+const MEDIA_NOUN = String.raw`(?:pic|pics|picture|pictures|photo|photos|selfie|selfies|snap|snaps|image|images|video|videos|nude|nudes|content)`;
+const MEDIA_VERB = String.raw`(?:send(?:ing)?|shar(?:e|ing)|show(?:ing)?|giv(?:e|ing)|drop(?:ping)?|swap(?:ping)?|trad(?:e|ing))`;
+
+const EXPLICIT_MEDIA_REFUSAL_PATTERNS = [
+  new RegExp(String.raw`\b(?:no|not|never|won't|wouldn't|don't|do not|can't|cannot)\b[^.\n]{0,60}\b${MEDIA_NOUN}\b`, 'i'),
+  new RegExp(String.raw`\b(?:won't|wouldn't|don't|do not|not going to|never)\b[^.\n]{0,40}\b${MEDIA_VERB}\b`, 'i'),
+  new RegExp(String.raw`\b(?:zero|no) interest\b[^.\n]{0,60}\b(?:${MEDIA_VERB}|${MEDIA_NOUN}|anything|something)\b`, 'i'),
+  new RegExp(String.raw`\b(?:rather not|not comfortable)\b[^.\n]{0,60}\b(?:${MEDIA_VERB}|${MEDIA_NOUN})\b`, 'i'),
+];
+
+const CONTEXTUAL_MEDIA_REFUSAL_PATTERNS = [
+  /^(?:no|nope|nah|no thanks|not really|rather not|pass)(?:,? thanks)?[.!\s]*$/i,
+  /^(?:i(?:'m| am)|im|we(?:'re| are)|we're) good(?: thanks)?[.!\s]*$/i,
+  /\b(?:zero interest|not interested|no interest)\b/i,
+  /\b(?:not sending|won't send|wouldn't send|don't send|do not send)\b/i,
+];
+
+const FULL_STOP_PATTERNS = [
+  /\bstop\b/i,
+  /\bleave me alone\b/i,
+  /\b(?:do not|don't) message\b/i,
+  /\bback off\b/i,
+  /^(?:(?:i'm|i am|im)\s+)?not interested[.!\s]*$/i,
+  /\b(?:creepy|uncomfortable|weirdest (?:reddit )?approach)\b/i,
+];
+
+export function containsMediaRequest(text: string): boolean {
+  return new RegExp(String.raw`\b${MEDIA_VERB}\b[^.!?\n]{0,60}\b${MEDIA_NOUN}\b`, 'i').test(text)
+    || new RegExp(String.raw`\b(?:can|could|would|will) you\b[^.!?\n]{0,60}\b(?:${MEDIA_VERB}\b[^.!?\n]{0,30})?\b${MEDIA_NOUN}\b`, 'i').test(text)
+    || new RegExp(String.raw`\bgot any (?:more )?${MEDIA_NOUN}\b`, 'i').test(text);
+}
+
+export function isFullConversationStop(text: string): boolean {
+  return FULL_STOP_PATTERNS.some((pattern) => pattern.test(text));
+}
+
+export function isMediaRefusal(text: string, mediaWasRequested: boolean): boolean {
+  const normalized = text.replaceAll('’', "'");
+  if (EXPLICIT_MEDIA_REFUSAL_PATTERNS.some((pattern) => pattern.test(normalized))) return true;
+  return mediaWasRequested && CONTEXTUAL_MEDIA_REFUSAL_PATTERNS.some((pattern) => pattern.test(normalized.trim()));
+}
+
+/**
+ * Detect recipient limits in sequence so short phrases such as "I'm good"
+ * only become a media boundary when they directly follow a media request.
+ */
+export function detectConversationBoundaries(messages: readonly BoundaryMessage[]): string[] {
+  const boundaries: string[] = [];
+  let lastSelfRequestedMedia = false;
+
+  for (const message of messages) {
+    if (message.isSelf) {
+      lastSelfRequestedMedia = containsMediaRequest(message.text);
+      continue;
+    }
+    if (isMediaRefusal(message.text, lastSelfRequestedMedia)) {
+      boundaries.push('does not want to send photos or videos');
+    }
+    if (isFullConversationStop(message.text)) {
+      boundaries.push('does not want further sexual escalation');
+    }
+  }
+
+  return [...new Set(boundaries)];
+}