13. Monitoring & Regression Prevention

#!/bin/bash
# scripts/check-build-time-regression.sh
# Jalankan di CI sebagai pre-merge check

SCHEME="${1:-MyApp}"
THRESHOLD_SECONDS="${2:-300}"  # Alert jika > 5 menit
CSV_FILE="build-times.csv"

echo "Building $SCHEME..."
START=$(date +%s)

xcodebuild build \
  -scheme "$SCHEME" \
  -destination 'platform=iOS Simulator,name=iPhone 16' \
  -configuration Debug \
  CODE_SIGNING_ALLOWED=NO \
  > /dev/null 2>&1

END=$(date +%s)
ELAPSED=$((END - START))

# Simpan hasil
echo "$(date +%Y-%m-%d %H:%M),${SCHEME},${ELAPSED},${GITHUB_SHA:-local}" >> "$CSV_FILE"

echo "Build time: ${ELAPSED}s (threshold: ${THRESHOLD_SECONDS}s)"

# Hitung rata-rata 5 build terakhir
if [ -f "$CSV_FILE" ]; then
  RECENT_AVG=$(tail -5 "$CSV_FILE" | awk -F',' '{sum += $3; count++} END {print sum/count}')
  echo "Recent average (5 builds): ${RECENT_AVG}s"

  # Regresi jika lebih dari 20% di atas rata-rata
  REGRESSION_LIMIT=$(echo "$RECENT_AVG * 1.20" | bc)
  if (( $(echo "$ELAPSED > $REGRESSION_LIMIT" | bc -l) )); then
    echo "⚠️  BUILD TIME REGRESSION DETECTED!"
    echo "Current: ${ELAPSED}s, Limit: ${REGRESSION_LIMIT}s"
    exit 1
  fi
fi

if [ "$ELAPSED" -gt "$THRESHOLD_SECONDS" ]; then
  echo "⚠️  Build time exceeds threshold!"
  exit 1
fi

echo "✓ Build time OK"

# Makefile — perintah build yang konsisten di semua mesin

.PHONY: build test clean measure setup

SCHEME = MyApp
WORKSPACE = MyApp.xcworkspace
DESTINATION = platform=iOS Simulator,name=iPhone 16