#!/bin/bash
# CKB Pre-commit Hook
# Blocks commits with critical risk changes
#
# Installation:
#   cp examples/hooks/pre-commit .git/hooks/pre-commit
#   chmod +x .git/hooks/pre-commit

set -e

# Check if CKB is installed
if ! command -v ckb &> /dev/null; then
    echo "CKB not installed, skipping impact analysis"
    exit 0
fi

# Check if we have staged changes
if git diff --cached --quiet; then
    exit 0
fi

echo "Running CKB impact analysis..."

# Run impact analysis on staged changes
RESULT=$(ckb impact diff --staged --format=json 2>/dev/null || echo '{"summary":{}}')

RISK=$(echo "$RESULT" | jq -r '.summary.estimatedRisk // "unknown"')
SYMBOLS=$(echo "$RESULT" | jq '.summary.symbolsChanged // 0')
AFFECTED=$(echo "$RESULT" | jq '.summary.transitivelyAffected // 0')
MODULES=$(echo "$RESULT" | jq '.blastRadius.moduleCount // 0')

# Critical risk: block commit
if [ "$RISK" = "critical" ]; then
    echo ""
    echo "⛔ CRITICAL RISK DETECTED"
    echo ""
    echo "   Symbols changed:        $SYMBOLS"
    echo "   Transitively affected:  $AFFECTED"
    echo "   Modules in blast radius: $MODULES"
    echo ""
    echo "   Review the impact before committing:"
    echo "   $ ckb impact diff --staged"
    echo ""
    echo "   To bypass this check:"
    echo "   $ git commit --no-verify"
    echo ""
    exit 1
fi

# High risk: warn but allow
if [ "$RISK" = "high" ]; then
    echo ""
    echo "⚠️  HIGH RISK CHANGE"
    echo ""
    echo "   Symbols changed:        $SYMBOLS"
    echo "   Transitively affected:  $AFFECTED"
    echo "   Modules in blast radius: $MODULES"
    echo ""
    echo "   Consider running full test suite before pushing."
    echo ""
fi

# Medium risk: info only
if [ "$RISK" = "medium" ]; then
    echo "ℹ️  Medium risk: $SYMBOLS symbols changed, $AFFECTED affected"
fi

exit 0