#!/bin/bash
# Build ARM64-only image for Raspberry Pi 4
# Faster build when you only need ARM64

set -e

IMAGE_NAME="${IMAGE_NAME:-easylinux/web-gateway}"
IMAGE_TAG="${IMAGE_TAG:-latest}"

echo "============================================"
echo "Building ARM64 Image for Raspberry Pi 4"
echo "============================================"
echo "Image: ${IMAGE_NAME}:${IMAGE_TAG}"
echo "Platform: linux/arm64"
echo "============================================"

# Check if buildx is available
if ! docker buildx version >/dev/null 2>&1; then
    echo "Error: docker buildx not found. Please install Docker Buildx."
    exit 1
fi

# Create builder if needed
if ! docker buildx ls | grep -q arm64-builder; then
    echo "Creating arm64-builder..."
    docker buildx create --name arm64-builder --use --bootstrap
else
    echo "Using existing arm64-builder..."
    docker buildx use arm64-builder
fi

# Build ARM64 image
echo "Building for ARM64..."
docker buildx build \
    --platform linux/arm64 \
    --tag "${IMAGE_NAME}:${IMAGE_TAG}" \
    --load \
    .

echo "============================================"
echo "✅ ARM64 image built successfully!"
echo "============================================"
echo "Image: ${IMAGE_NAME}:${IMAGE_TAG}"
echo ""
echo "Push to registry:"
echo "  docker push ${IMAGE_NAME}:${IMAGE_TAG}"
echo ""
echo "Or save as tar:"
echo "  docker save ${IMAGE_NAME}:${IMAGE_TAG} | gzip > web-gateway-arm64.tar.gz"