#!/bin/bash

function is_django_installed() {
  python -c "import django" &>/dev/null
}

function should_collectstatic() {
  is_django_installed && [[ -z "$DISABLE_COLLECTSTATIC" ]]
}

function virtualenv_bin() {
  if head "/etc/redhat-release" | grep -q "^Fedora"; then
    virtualenv-${PYTHON_VERSION} $1
  else
    virtualenv $1
  fi
}

# Install pipenv to the separate virtualenv to isolate it
# from system Python packages and packages in the main
# virtualenv. Executable is simlinked into ~/.local/bin
# to be accessible. This approach is inspired by pipsi
# (pip script installer).
function install_pipenv() {
  echo "---> Installing pipenv packaging tool ..."
  VENV_DIR=$HOME/.local/venvs/pipenv
  virtualenv_bin "$VENV_DIR"
  $VENV_DIR/bin/pip --isolated install -U pipenv
  mkdir -p $HOME/.local/bin
  ln -s $VENV_DIR/bin/pipenv $HOME/.local/bin/pipenv
}

set -e

shopt -s dotglob
echo "---> Installing application source ..."
mv /tmp/src/* ./

if [[ ! -z "$UPGRADE_PIP_TO_LATEST" ]]; then
  echo "---> Upgrading pip to latest version ..."
  pip install -U pip setuptools wheel
fi

if [[ ! -z "$ENABLE_PIPENV" ]]; then
  install_pipenv
  echo "---> Installing dependencies via pipenv ..."
  if [[ -f Pipfile ]]; then
    pipenv install --deploy
  elif [[ -f requirements.txt ]]; then
    pipenv install -r requirements.txt
  fi
  # pipenv check
elif [[ -f requirements.txt ]]; then
  echo "---> Installing dependencies ..."
  pip install -r requirements.txt
fi

if [[ -f setup.py && -z "$DISABLE_SETUP_PY_PROCESSING" ]]; then
  echo "---> Installing application ..."
  pip install .
fi

if should_collectstatic; then
  (
    echo "---> Collecting Django static files ..."


    APP_HOME=${APP_HOME:-.}
    # Look for 'manage.py' in the directory specified by APP_HOME, or the current directory
    manage_file=$APP_HOME/manage.py

    if [[ ! -f "$manage_file" ]]; then
      echo "WARNING: seems that you're using Django, but we could not find a 'manage.py' file."
      echo "'manage.py collectstatic' ignored."
      exit
    fi

    if ! python $manage_file collectstatic --dry-run --noinput &> /dev/null; then
      echo "WARNING: could not run 'manage.py collectstatic'. To debug, run:"
      echo "    $ python $manage_file collectstatic --noinput"
      echo "Ignore this warning if you're not serving static files with Django."
      exit
    fi

    python $manage_file collectstatic --noinput
  )
fi

# set permissions for any installed artifacts
fix-permissions /opt/app-root