human hand off fix

backend/app/services/handoff_email_templates.py

@@ -1,3 +1,4 @@
+from datetime import datetime
 from html import escape
 
 
@@ -25,13 +26,72 @@ def format_sender_line(sender: dict) -> str:
     name = (sender.get("name") or "").strip()
     address = (sender.get("address") or "").strip()
     if not address:
-        return "unknown sender"
+        return name or "unknown sender"
     local = address.split("@", 1)[0].lower()
     if name and name.lower() not in {local, address.lower()}:
         return f"{name} <{address}>"
     return address
 
 
+def sender_display_name(sender: dict | None) -> str:
+    sender = sender or {}
+    name = (sender.get("name") or "").strip()
+    address = (sender.get("address") or "").strip()
+    if name:
+        return name
+    if address:
+        return address.split("@", 1)[0].replace(".", " ").replace("_", " ").replace("-", " ").title()
+    return "unknown sender"
+
+
+def _attribution_date(value) -> str:
+    if not isinstance(value, datetime):
+        return ""
+    return value.strftime("%a, %b %d, %Y at %I:%M %p").replace(" 0", " ")
+
+
+def build_gmail_quote(
+    *,
+    sender: dict | None,
+    event_at,
+    body_text: str | None,
+    body_html: str | None,
+) -> tuple[str, str]:
+    identity = format_sender_line(sender or {})
+    date = _attribution_date(event_at)
+    attribution = f"On {date} {identity} wrote:" if date else f"{identity} wrote:"
+    text_source = (body_text or "").rstrip()
+    quoted_lines = [f"> {line}" if line else ">" for line in text_source.splitlines()]
+    quoted_text = f"{attribution}\n" + "\n".join(quoted_lines)
+    inner_html = (body_html or "").strip() or (
+        f"<div>{escape(text_source).replace(chr(10), '<br>')}</div>"
+    )
+    quoted_html = (
+        f'<div class="gmail_quote">'
+        f'<div class="gmail_attr">{escape(attribution)}<br></div>'
+        f'<blockquote class="gmail_quote" '
+        f'style="margin:0 0 0 .8ex;border-left:1px solid #ccc;padding-left:1ex">'
+        f"{inner_html}"
+        f"</blockquote></div>"
+    )
+    return quoted_text, quoted_html
+
+
+def attach_quoted_history(
+    *,
+    new_text: str,
+    new_html: str | None,
+    quoted_text: str,
+    quoted_html: str,
+) -> tuple[str, str]:
+    body_text = f"{new_text.rstrip()}\n\n{quoted_text}".strip()
+    visible_html = (new_html or "").strip() or (
+        f"<div>{escape(new_text).replace(chr(10), '<br>')}</div>"
+    )
+    body_html = f"{visible_html}<br>{quoted_html}"
+    return body_text, body_html
+
+
 def _footer_html(agent_email: str) -> str:
     return f"""
 <div class="gentic-handoff-footer" style="background:#F8F7FC;border-top:1px solid #E9E5F2;padding:12px 20px;">