#!/usr/bin/env bash
# bin/compile <build-dir> <cache-dir>

set -e
set -o pipefail

BIN_DIR=$(cd $(dirname $0); pwd) # absolute path
BUILD_DIR=$1
CACHE_DIR=$2

NAME=$($BIN_DIR/detect $BUILD_DIR)
PIP_DOWNLOAD_CACHE=${PIP_DOWNLOAD_CACHE:-$CACHE_DIR/pip_downloads}
VIRTUALENV_DIRS="bin include lib"

function sed() {
  # prefer GNU sed over BSD sed on OS X
  $(which gsed || which sed) "$@"
}

cd $BUILD_DIR

# COMPILE HOOK: export build environment if specified
(make environment 2> /dev/null) && eval $(make environment)

# copy artifacts out of cache if exists
mkdir -p $CACHE_DIR
for dir in $VIRTUALENV_DIRS; do
  cp -R $CACHE_DIR/$dir . &> /dev/null || true
done

echo "-----> Preparing virtualenv version $(virtualenv --version)"
virtualenv --no-site-packages . | sed -u 's/^/       /'

echo "-----> Byte-compiling code"
find . -name "*.py" | xargs bin/python -m py_compile

# if Django, inject psycopg and append settings
if [ "$NAME" = "Python/Django" ]; then
  echo "-----> Django settings injection"

  SETTINGS_FILE=$(ls **/settings.py | head -1)
  echo "       Injecting code into $SETTINGS_FILE to read from DATABASE_URL"

  $BIN_DIR/../opt/inject_dbs $SETTINGS_FILE _settings.py
  mv _settings.py $SETTINGS_FILE
fi

echo "-----> Installing dependencies using pip version $(pip --version | awk '{print $2}')"
PIP_DOWNLOAD_CACHE=$PIP_DOWNLOAD_CACHE bin/pip install -r requirements.txt ${PIP_OPTS} | sed -u 's/^/       /'

# store new artifacts in cache
for dir in $VIRTUALENV_DIRS; do
  rm -rf $CACHE_DIR/$dir
  cp -R $dir $CACHE_DIR/
done