#!/usr/bin/env bash
set -euo pipefail

# Build gplan.so for the Onefinity Pi (armv7l, Python 3.5, GCC 6.3)
#
# Uses a Raspbian Stretch Docker image that exactly matches the Pi's
# toolchain. No cross-compile, no relink hacks, no GLIBC mismatches.
#
# First run:   ~30min  (builds Docker image with cbang + camotics)
# After that:  ~1sec   (copies pre-built gplan.so from image)

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
PROJECT_DIR="$(dirname "$SCRIPT_DIR")"
IMAGE="onefin-gplan"
OUTPUT="$PROJECT_DIR/src/py/camotics/gplan.so"

# Build image if needed (one-time)
if ! docker image inspect "$IMAGE" >/dev/null 2>&1; then
    echo "Building $IMAGE Docker image (one-time, ~30min under QEMU)..."
    docker build -t "$IMAGE" -f "$SCRIPT_DIR/Dockerfile.gplan" "$SCRIPT_DIR"
fi

# Copy gplan.so out of the image
echo "Extracting gplan.so..."
docker run --rm -v "$PROJECT_DIR:/workspace" "$IMAGE" \
    bash -c 'cp /opt/camotics/gplan.so /workspace/src/py/camotics/gplan.so && \
             file /workspace/src/py/camotics/gplan.so && \
             readelf -d /workspace/src/py/camotics/gplan.so | grep -E "NEEDED|python"'

echo "✓ Built: $OUTPUT"