#!/bin/bash
# Session end hook - triggers summarization of the conversation
# Receives JSON via stdin with session_id, transcript_path, reason
#
# Uses Claude CLI with subscription credentials for LLM extraction.
# Heuristic extraction (paths, facts) always runs.
# LLM extraction (decisions, preferences) runs if claude CLI is available.

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
LOG_FILE="${HOME}/.claude/logs/session-end.log"

# Ensure log directory exists
mkdir -p "$(dirname "$LOG_FILE")"

log() {
    echo "[$(date -Iseconds)] $*" >> "$LOG_FILE"
}

# Read JSON input from stdin
INPUT=$(cat)

# Parse JSON fields
SESSION_ID=$(echo "$INPUT" | python3 -c "import sys, json; print(json.load(sys.stdin).get('session_id', ''))" 2>/dev/null || echo "")
TRANSCRIPT_PATH=$(echo "$INPUT" | python3 -c "import sys, json; print(json.load(sys.stdin).get('transcript_path', ''))" 2>/dev/null || echo "")
REASON=$(echo "$INPUT" | python3 -c "import sys, json; print(json.load(sys.stdin).get('reason', ''))" 2>/dev/null || echo "")

log "SessionEnd triggered: session=$SESSION_ID reason=$REASON"

# Clear guardrail session allowlist (confirmations don't persist across sessions)
GUARDRAIL_SESSION="${HOME}/.claude/state/guardrail-session.json"
if [[ -f "$GUARDRAIL_SESSION" ]]; then
    rm -f "$GUARDRAIL_SESSION"
    log "Cleared guardrail session allowlist"
fi

# Validate required fields
if [[ -z "$SESSION_ID" || -z "$TRANSCRIPT_PATH" ]]; then
    log "ERROR: Missing session_id or transcript_path"
    exit 0  # Exit cleanly - don't break session exit
fi

# Check if transcript exists
if [[ ! -f "$TRANSCRIPT_PATH" ]]; then
    log "ERROR: Transcript not found at $TRANSCRIPT_PATH"
    exit 0
fi

# Run summarization script in background to not block session exit
# The script will handle its own error logging
nohup python3 "${SCRIPT_DIR}/summarize-transcript.py" \
    --session-id "$SESSION_ID" \
    --transcript "$TRANSCRIPT_PATH" \
    --reason "$REASON" \
    >> "$LOG_FILE" 2>&1 &

log "Summarization started in background (PID: $!)"

# Return success - don't block session exit
exit 0