#!/bin/bash
# Blocks ExitPlanMode unless a *-PLAN.md file exists in the current working directory.
# Fired via PreToolUse hook on ExitPlanMode.
# Input: JSON on stdin with session context including "cwd".

INPUT=$(cat)
CWD=$(echo "$INPUT" | python3 -c "import sys, json; print(json.load(sys.stdin).get('cwd', ''))" 2>/dev/null)

if [ -z "$CWD" ]; then
    exit 0  # Can't determine cwd, allow through
fi

# Projects can opt out by placing .claude/skip-plan-file-check in their root.
# Used when the project manages plans via an external system (e.g. a work-items CP).
if [ -f "$CWD/.claude/skip-plan-file-check" ]; then
    exit 0
fi

if ls "$CWD"/*-PLAN.md 2>/dev/null | grep -q .; then
    exit 0  # Plan file exists, allow exit
fi

echo "No PLAN.md file found in $CWD. Before exiting plan mode, write the complete plan to a file named [MILESTONE]-[PURPOSE]-PLAN.md in the project root (e.g. M2-auth-PLAN.md)." >&2
exit 2