#!/usr/bin/env bash

set -e

TAMARIN_DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )


BASE_DIR="$TAMARIN_DIR" source "$TAMARIN_DIR/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   Optionel - Nom de l'image Docker à utiliser comme base pourl'environnement de build. Défaut: debian:jessie"
  echo
}

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

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

  # Link lib & hooks folders
  ln -s $(readlink -f "$TAMARIN_DIR/lib") "$temp_dir/lib"
  ln -s $(readlink -f "$TAMARIN_DIR/hooks") "$temp_dir/hooks"

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

    ENV DEBIAN_FRONTEND noninteractive

    RUN apt-get update &&\
        apt-get install --yes build-essential devscripts

    RUN mkdir /root/.tamarin
    RUN mkdir /project

    ADD ./lib /root/.tamarin/lib
    ADD ./hooks /hooks
    RUN chmod +x /root/.tamarin/lib/build.sh

    VOLUME /src
    VOLUME /dist

    CMD /root/.tamarin/lib/build.sh

EOF

  exec_hooks "containerbuild" "$temp_dir"

  # Build image
  tar -C "$temp_dir" -czh . | docker build -t "$container_tag" - 2> >(error) 1> >(info)

  # Delete temporary folder
  rm -rf "$temp_dir"

}

# Main function
function main {

  info "Building container from $BASE_IMAGE..."

  # Create container & "$container_tag" variable
  create_container

  local project_name="$(basename "${PROJECT_PATH}")"

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

  info "Done"

}

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

PROJECT_PATH="$(readlink -f $1)"
PROJECT_DIST="$(readlink -f $2)"
BASE_IMAGE="${3:-debian:jessie}"

main