#!/usr/bin/env bash

set -e

source ./lib/util.sh

function show_usage {
  echo
  echo "Usage: $0 <src> <dist> <image>"
  echo
  echo "Paramètres: "
  echo
  echo "  - <src> Chemin vers le répertoire des sources du projet à empaqueter"
  echo "  - <dist>  Chemin vers le répertoire de destination du paquet à créer"
  echo "  - <image> Nom de l'image Docker à utiliser comme base pourl'environnement de build. Exemple: debian:jessie"
  echo
}

# Create a build container based on the $BASE_IMAGE argument
function create_container {

  # Escape image name
  escaped_basename=$(echo "$BASE_IMAGE" | sed 's/[^a-z0-9\-\_\.]/\_/gi')
  # Generate container tag
  container_tag="bricklayer:${escaped_basename}_$(date +%s)"
  # Create temporary dir for the Dockerfile
  temp_dir="$(mktemp -d)"

  # Link lib folder
  ln -s $(readlink -f ./lib) "$temp_dir/lib"

  # Create Dockerfile
  cat << EOF > "$temp_dir/Dockerfile"
    FROM $BASE_IMAGE

    ENV DEBIAN_FRONTEND noninteractive

    RUN apt-get update &&\
        apt-get install jq

    ADD ./lib /bricklayer
    RUN chmod +x /bricklayer/build.sh

    VOLUME /src
    VOLUME /dist

    CMD /bricklayer/build.sh
EOF

  # Build image
  tar -C "$temp_dir" -czh . | docker build -t "$container_tag" - 1>&2

  # Delete temporary folder
  rm -rf "$temp_dir"

  # Return newly created container's tag
  echo $container_tag

}

# Main function
function main {

  info "Building container from $BASE_IMAGE..."
  container_tag="$(create_container)"

  info "Launching container..."
  docker run -e "DISTRIB=$BASE_IMAGE" --rm -v="$PROJECT_PATH:/src" -v="$PROJECT_DIST:/dist" "$container_tag"

  info "Cleaning container data..."

  info "Done"
}

# Test for arguments
if [ -z "$1" ] || [ -z "$2" ] || [ -z "$3" ]; then
  show_usage
  exit 1
fi

PROJECT_PATH="$(readlink -f $1)"
PROJECT_DIST="$(readlink -f $2)"
BASE_IMAGE="$3"

main