#!/usr/bin/env bash

# CONFIG

## Default
PROGRAM=`basename $0`
GIT_URL="git@github.com:eost/gissmo.git"
GIT_BRANCH="dev"  # Default Git Branch
GIT_DIR_NAME="gissmo"
DOCKERFILE_NAME="Dockerfile"

## User
. config || exit 1

## Composed
GISSMO_DIR="${PROJECT_DIR}/${GIT_DIR_NAME}"
DOCKERFILE="${GISSMO_DIR}/${DOCKERFILE_NAME}"

COMMAND="$1"


# METHODS
error_and_continue() {
  echo "ERROR: $1"
}

error_and_quit() {
  error_and_continue "$1"
  exit 0
}

info() {
  echo "INFO: $1"
}

not_implemented() {
  error_and_quit "Not implemented"
}

show_help() {
  echo    "$PROGRAM [COMMAND]"
  echo -e "  Where COMMAND is one of:"
  echo -e "   - create  "
  echo -e "   - init    "
  echo -e "   - restore "
  echo -e "   - start   "
  echo -e "   - stop    "
}

check_command() {
  if test $1 == "create"; then
    return 0
  elif test $1 == "init"; then
    return 0
  elif test $1 == "restore"; then
    return 0
  elif test $1 == "start"; then
    return 0
  elif test $1 == "stop"; then
    return 0
  fi
  error_and_continue "Unknown command."
  show_help
  exit 1
}

create() {
  init
  not_implemented
}

init() {
  # check directory existence
  if ! test -d "$PROJECT_DIR"; then
    mkdir -p "$PROJECT_DIR" || error_and_quit "Create ${PROJECT_DIR} failed."
    info "$PROJECT_DIR created."
    echo "${PROJECT_DIR} created."
    virtualenv -p python3 $PROJECT_DIR || error_and_quit "Create ${PROJECT_DIR} python virtual environment failed."
    info "Python virtual environment initialized."
  fi
  cd $PROJECT_DIR
  sudo apt-get install -qq libpq-dev python3-dev python-virtualenv git-core python3-pip || error_and_quit "Dependancies installation failed."
  info "Dependancies via apt-get checked/installed."
  if ! test -d "$GISSMO_DIR/.git/"; then
    git clone -q $GIT_URL $GISSMO_DIR || error_and_quit "Fetch Git repository failed."
  else
    GIT_WORK_TREE="${GISSMO_DIR}/" GIT_DIR="${GISSMO_DIR}/.git/" git pull -q origin master || error_and_quit "Pull command on Git repository failed."
  fi
  info "Git repository checked."
  . bin/activate || error_and_quit "Failed entering python virtual environment"
  cd $GISSMO_DIR
  pip install -q -r requirements.txt || error_and_quit "Python dependancies installation failed."
  info "Python dependancies checked."
  deactivate || error_and_quit "Failed exiting python virtual environment."
}

restore() {
  not_implemented
}

start() {
  not_implemented
}

stop() {
  not_implemented
}

generate_database_persistent_volume() {
  not_implemented
}



# CHECK CONFIG
if test -z $PROJECT_DIR; then
  error_and_quit "No project directory given."
fi

if test -z $GIT_BRANCH; then
  error_and_quit "No git branch given."
fi

# Don't check repository if INIT COMMAND is given
if ! test -d $GIT_REPOSITORY && ! test "$COMMAND" == "init"; then
  error_and_quit "Repository don't exists: ${GIT_REPOSITORY}"
fi

if test -z $DOCKERFILE_NAME; then
  error_and_quit "No docker filename given."
fi

if ! test -f $DOCKERFILE && ! test "$COMMAND" == "init"; then
  error_and_quit "Docker file don't exists: ${DOCKERFILE}"
fi

if ! test -z $COMMAND; then
  check_command "$COMMAND"
  $COMMAND
else
  show_help
fi

exit 1