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

WORKDIR=$(dirname "$0")
WORKDIR=$(readlink -f "${WORKDIR}")
DIR_NAME=$(basename "$WORKDIR")
cd "$WORKDIR"

# Do not deploy the lambda to AWS
DRY_RUN=${DRY_RUN:-}
# Python runtime to install dependencies
PY_VERSION=${PY_VERSION:-3.10}
PY_EXEC="python${PY_VERSION}"
# Image to build the lambda zip package
DOCKER_IMAGE="public.ecr.aws/lambda/python:${PY_VERSION}"
# Rename the_lambda_name directory to the-lambda-name lambda in AWS
LAMBDA_NAME=${DIR_NAME//_/-}
# The name of directory with lambda code
PACKAGE=lambda-package

# Do not rebuild and deploy the archive if it's newer than sources
if [ -e "$PACKAGE.zip" ] && [ -z "$FORCE" ]; then
  REBUILD=""
  for src in app.py build_and_deploy_archive.sh requirements.txt lambda_shared/*; do
    if [ "$src" -nt "$PACKAGE.zip" ]; then
      REBUILD=1
    fi
  done
  [ -n "$REBUILD" ] || exit 0
fi

docker_cmd=(
  docker run -i --net=host --rm --user="${UID}" -e HOME=/tmp --entrypoint=/bin/bash
  --volume="${WORKDIR}/..:/ci" --workdir="/ci/${DIR_NAME}" "${DOCKER_IMAGE}"
)
rm -rf "$PACKAGE" "$PACKAGE".zip
mkdir "$PACKAGE"
cp app.py "$PACKAGE"
if [ -f requirements.txt ]; then
  VENV=lambda-venv
  rm -rf "$VENV"
  "${docker_cmd[@]}" -ex <<EOF
    '$PY_EXEC' -m venv '$VENV' &&
    source '$VENV/bin/activate' &&
    pip install -r requirements.txt &&
    # To have consistent pyc files
    find '$VENV/lib' -name '*.pyc' -delete
    cp -rT '$VENV/lib/$PY_EXEC/site-packages/' '$PACKAGE'
    rm -r '$PACKAGE'/{pip,pip-*,setuptools,setuptools-*}
    chmod 0777 -R '$PACKAGE'
EOF
fi
# Create zip archive via python zipfile to have it cross-platform
"${docker_cmd[@]}" -ex <<EOF
cd '$PACKAGE'
find ! -type d -exec touch -t 201212121212 {} +

python <<'EOP'
import zipfile
import os
files_path = []
for root, _, files in os.walk('.'):
    files_path.extend(os.path.join(root, file) for file in files)
# persistent file order
files_path.sort()
with zipfile.ZipFile('../$PACKAGE.zip', 'w') as zf:
    for file in files_path:
        zf.write(file)
EOP
EOF

ECHO=()
if [ -n "$DRY_RUN" ]; then
  ECHO=(echo Run the following command to push the changes:)
fi
"${ECHO[@]}" aws lambda update-function-code --function-name "$LAMBDA_NAME" --zip-file fileb://"$WORKDIR/$PACKAGE".zip