#!/bin/bash
# Emit the canonical session-log "## User" attribution block.
#
# ATTRIBUTION IS NEVER INFERRED. The only sources of truth are:
#   .claude/identity.json  (per-machine, gitignored — who sits at this keyboard)
#   .claude/users.json     (role lookup by user key)
# Do NOT derive the user from the hostname, the `# userEmail` context hint, or
# from memory. /save calls this script and pastes its output verbatim as the
# session log's first section, so every log is stamped identically and correctly.
set -e

REPO_ROOT=$(git rev-parse --show-toplevel 2>/dev/null || pwd)
ID="$REPO_ROOT/.claude/identity.json"
USERS="$REPO_ROOT/.claude/users.json"

if [ ! -f "$ID" ]; then
    echo "## User"
    echo "- **User:** UNKNOWN — no .claude/identity.json on this machine."
    echo "- **Action:** run the first-machine onboarding flow in CLAUDE.md before saving."
    exit 0
fi

PYTHON=""
for c in py python3 python; do
    if command -v "$c" >/dev/null 2>&1 && "$c" -c "import sys" >/dev/null 2>&1; then PYTHON="$c"; break; fi
done
if [ -z "$PYTHON" ]; then
    echo "## User"
    echo "- **User:** (could not render — no Python interpreter found)"
    exit 0
fi

"$PYTHON" - "$ID" "$USERS" <<'PYEOF'
import json, sys, socket, re
idp, usersp = sys.argv[1], sys.argv[2]
try:
    d = json.load(open(idp))
except Exception as e:
    print("## User")
    print(f"- **User:** UNREADABLE — .claude/identity.json failed to parse ({e}).")
    print("- **Action:** repair identity.json before saving; do not infer the user.")
    sys.exit(0)
full    = d.get("full_name") or d.get("user", "unknown")
user    = d.get("user", "unknown")
machine = d.get("machine", "unknown")
role    = d.get("role", "")

if not role:
    try:
        role = json.load(open(usersp))["users"].get(user, {}).get("role", "")
    except Exception:
        pass

def norm(x): return re.sub(r'\.local$', '', (x or '').lower())
host = socket.gethostname()
stale = machine and host and norm(machine) != norm(host)

print("## User")
print(f"- **User:** {full} ({user})")
print(f"- **Machine:** {machine}")
if role:
    print(f"- **Role:** {role}")
if stale:
    print(f"- **[WARNING]** identity.json machine '{machine}' != hostname '{host}'. "
          f"identity.json may be stale on this box — verify before trusting this attribution.")
PYEOF