#!/usr/bin/env bash
# Claude Code — UserPromptSubmit hook
#
# Logs each new user prompt to .claude/request-log.jsonl (git-tracked).
# Runs async so it never blocks Claude's response.
#
# Input (stdin): JSON with fields: session_id, cwd, prompt, is_continuation

set -euo pipefail

INPUT=$(cat)

PROMPT=$(echo "$INPUT" | jq -r '.prompt // ""')
SESSION_ID=$(echo "$INPUT" | jq -r '.session_id // ""')
CWD=$(echo "$INPUT" | jq -r '.cwd // "$PWD"')
IS_CONTINUATION=$(echo "$INPUT" | jq -r '.is_continuation // false')

LOG_FILE="${CWD}/.claude/request-log.jsonl"

# Skip: continuation turns, trivially short prompts, no log file dir
if [ "$IS_CONTINUATION" = "true" ]; then
  exit 0
fi

if [ "${#PROMPT}" -lt 5 ]; then
  exit 0
fi

if [ ! -d "${CWD}/.claude" ]; then
  exit 0
fi

TIMESTAMP=$(date -u +"%Y-%m-%dT%H:%M:%SZ")
REQ_ID="req_$(date +%Y%m%d_%H%M%S)_$(LC_ALL=C tr -dc 'a-z0-9' < /dev/urandom | head -c 5)"
BRANCH=$(git -C "$CWD" rev-parse --abbrev-ref HEAD 2>/dev/null || echo "unknown")

jq -n \
  --arg id       "$REQ_ID" \
  --arg ts       "$TIMESTAMP" \
  --arg prompt   "$PROMPT" \
  --arg session  "$SESSION_ID" \
  --arg branch   "$BRANCH" \
  '{
    id:         $id,
    timestamp:  $ts,
    prompt:     $prompt,
    session:    $session,
    branch:     $branch,
    pr_number:  null,
    pr_url:     null,
    status:     "pending"
  }' >> "$LOG_FILE"

exit 0