#!/usr/bin/env bash
set -e

usage() {
    echo "Usage: vantiq-setup -u <docker hub username> -p <docker hub password> [-o <overrides directory>]"
}

abspath() {
    [[ $1 = /* ]] && echo "$1" || echo "$PWD/${1#./}"
}

#
# Do initial bootstrapping of a Dockerized Vantiq K8s deployment client.  We need the following:
#
#   -u -- the docker hub username to use when pulling Vantiq images
#   -p -- the docker hub password to use when pulling Vantiq images
#   -o -- the directory in which deployment override files will live.  Optional -- defaults to cwd.

# OS specific support (must be 'true' or 'false').
msys=false
darwin=false
case "`uname`" in
  CYGWIN* )
    echo "Cygwin is not currently supported.  Please install a MINGW based shell (e.g. Git Bash)"
    exit 1
    ;;
  Darwin* )
    darwin=true
    ;;
  MINGW* )
    msys=true
    ;;
esac

username=""
password=""
overrides=$(pwd)

while getopts ":u:p:o:" opt; do
  case ${opt} in
    u ) # process user option
      username=$OPTARG
      ;;
    p ) # process password option
      password=$OPTARG
      ;;
    o ) # process overrides option
      overrides=$OPTARG
      ;;
    \? )
      echo "Unrecognized option: $OPTARG"
      usage
      exit 1
      ;;
    : )
      echo "Invalid option: $OPTARG requires an argument" 1>&2
      exit 1
      ;;
  esac
done

# Get rid of the options processed by getopts
shift $((OPTIND -1))

# Confirm we have what we want

if [ -z $username ]; then
    echo "Missing mandatory option -u to specify Docker Hub user name." 1>&2
    usage
    exit 1
fi

if [ -z $password ]; then
    echo "Missing mandatory option -p to specify Docker Hub password." 1>&2
    usage
    exit 1
fi

# If the given directory doesn't exist, create (unless it's a file, then bitch)
if [ ! -d $overrides ]; then
    # Could be a file
    if [ -f $overrides ]; then
        echo "Specified overrides directory '$overrides' exists, but isn't a directory." 1>&2
        usage
        exit 1
    fi

    # Create
    mkdir -p $overrides
fi

# Use username and password to log in to docker hub and pull the Vantiq K8s deploy image
echo $password | docker login --username $username --password-stdin
docker pull vantiq/k8sdeploy

# Construct gradle properties file in the overrides dir (this gets moved to the k8sdeploy volume during bootstrap
# On Linux we can access DiD via the UD
dockerHost=""
if $msys; then
    dockerHost="tcp://docker.for.win.localhost:2375"
fi
cat <<-EOF > $overrides/gradle.properties
    dockerHost=$dockerHost
    dockerHubUser=$username
    dockerHubPassword=$password
EOF

# Run K8s deploy bootstrapping command to set things up for future deployments.
echo "Configuring Vantiq K8s deployment using overrides directory $overrides."
echo "This will create the script 'vantiq-deploy.' in this directory."
overridesMount=$(abspath $overrides)
if $msys; then
    # Add additional slash to avoid shell conversion to Windows style paths
    overridesMount="/$overridesMount"
fi
docker run --rm -it -v vantiq_gradle:/home/vantiq/.gradle -v vantiq_k8sDeploy:/home/vantiq/k8sdeploy \
    -v ${overridesMount}:/home/vantiq/overrides vantiq/k8sdeploy

# Generic Vantiq deploy script and make executable
socketMount="-v /var/run/docker.sock:/var/run/docker.sock"
if $msys; then
    socketMount=""
fi
cat <<-EOF > $overrides/vantiq-deploy
    docker run --rm -it -v vantiq_gradle:/home/vantiq/.gradle -v vantiq_k8sDeploy:/home/vantiq/k8sdeploy \
        -v ${overridesMount}:/home/vantiq/overrides $socketMount vantiq/k8sdeploy "\$@"
EOF
chmod +x $overrides/vantiq-deploy