#!/usr/bin/env bash

# CONFIG

## Default
PROGRAM=`basename $0`
docker_cmd=`which docker`
CURRENT_DIR=$(pwd)
GIT_URL="git@github.com:eost/gissmo.git"
GIT_BRANCH="dev"  # Default Git Branch
GIT_DIR_NAME="gissmo"
DOCKERFILE_NAME="Dockerfile"
DB_DIR="/dbdata"
POSTGRES_VERSION="9.5"
GISSMO_DOCKER_NAME="gissmo"

## User
. config || exit 1

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

## Miscellaneous
COMMAND="$1"
shift 1; ARGS="$@"

red=`tput setaf 9`
green=`tput setaf 2`
yellow=`tput setaf 3`
blue=`tput setaf 4`
violet=`tput setaf 5`
cyan=`tput setaf 6`
white=`tput setaf 7`
reset=`tput sgr0` # No Color



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

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

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

not_implemented() {
  error_and_quit "Not implemented"
}

show_help() {
  echo    "$PROGRAM [COMMAND]"
  echo -e "  Where ${green}COMMAND${reset} is one of:"
  echo -e "   - create       Create postgreSQL database volume and postgreSQL Docker container"
  echo -e "   - init         Create project directory as python virtual environment, fetch git repository and install Python dependancies"
  echo -e "   - migrate      Launch migration command: python manage.py migrate"
  echo -e "   - restore dump Restore the given dump"
  echo -e "   - start args   Launch Gissmo Docker container (created by 'create' command) with a name given in GISSMO_DOCKER_NAME variable"
  echo -e "   - stop         Stop Gissmo Docker container which name is GISSMO_DOCKER_NAME variable content"
  # TODO: Add clean() command to STOP and DELETE Gissmo Docker container
  # TODO: Add clean_db() command to STOP and DELETE postgreSQL Docker container
  # TODO: Add clean_all() command that makes clean() and clean_db()
}

check_command() {
  if test $1 == "create"; then
    return 0
  elif test $1 == "init"; then
    return 0
  elif test $1 == "migrate"; 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
}

test_docker_cmd() {
  if test -z "$docker_cmd"; then
    error_and_quit "Docker command not found. Install docker or fill in the PATH."
  fi
  return 0
}

test_postgresql_exists() {
  PSQL_RUNNING=$($docker_cmd inspect --format="{{ .State.Running }}" ${POSTGRES_DOCKER_NAME} 2> /dev/null)
  if [ $? -eq 1 ]; then
    error_and_quit "postgreSQL Docker container not found: ${POSTGRES_DOCKER_NAME}. Please launch '$PROGRAM create' first."
  fi
}

test_postgresql_launched() {
  PSQL_RUNNING=$($docker_cmd inspect --format="{{ .State.Running }}" ${POSTGRES_DOCKER_NAME} 2> /dev/null)
  if test $PSQL_RUNNING == "false"; then
    return 1
  fi
  return 0
}

test_create() {
  test_docker_cmd
  if test -z "$DB_DIR"; then
    error_and_quit "No database directory given (DB_DIR in config file)."
  fi
  if test -z "$DB_VOLUME_NAME"; then
    error_and_quit "No database volume name given (DB_VOLUME_NAME in config file)."
  fi
  if test -z "$POSTGRES_VERSION"; then
    error_and_quit "No postgres version given (POSTGRES_VERSION in config file)."
  fi
  if test -z "$POSTGRES_DOCKER_NAME"; then
    error_and_quit "You need a name for your Docker database container (POSTGRES_DOCKER_NAME in config file)."
  fi
}

create() {
  test_create
  init
  $docker_cmd create -v "${DB_DIR}:/var/lib/postgresql/data" --name "${DB_VOLUME_NAME}" "postgres:${POSTGRES_VERSION}" || error_and_quit "Initial database 'docker create' failed."
  $docker_cmd run -d --volumes-from "${DB_VOLUME_NAME}" --name "${POSTGRES_DOCKER_NAME}" "postgres:${POSTGRES_VERSION}" || error_and_quit "Launching database docker container failed."
}

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 -b "$GIT_BRANCH" "$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."
}

test_migrate() {
  test_start
}

migrate() {
  test_migrate
  $docker_cmd run -it --rm --link ${POSTGRES_DOCKER_NAME}:db gissmo:${GISSMO_VERSION} python manage.py migrate || error_and_quit "Failed to launch Gissmo migration."
}

test_restore() {
  if test -z $ARGS; then
    error_and_quit "Missing database dump file"
  fi
  if ! test -f "$ARGS"; then
    error_and_quit "File '${ARGS}' not found."
  fi
  DUMP_FILE=`basename $ARGS`
  info "Dump file found: ${DUMP_FILE}"
  DUMP_DIR="${ARGS%/*}"
}

restore() {
  test_create
  test_restore
  $docker_cmd stop ${POSTGRES_DOCKER_NAME} && $docker_cmd rm ${POSTGRES_DOCKER_NAME} || error_and_quit "Failed to stop and delete postgreSQL Docker container: ${POSTGRES_DOCKER_NAME}"
  sudo rm -rf ${DB_DIR} || error_and_quit "Failed to delete this directory: ${DB_DIR}"
  $docker_cmd run -d --volumes-from "${DB_VOLUME_NAME}" --name "${POSTGRES_DOCKER_NAME}" "postgres:${POSTGRES_VERSION}" || error_and_quit "Launching database docker container failed."
  sleep 6 # to wait about docker container runs totally
  RESTORE_COMMAND="$docker_cmd run -it --rm --link ${POSTGRES_DOCKER_NAME}:db -v ${DUMP_DIR}:/backup -e PGHOST=`$docker_cmd inspect -f \"{{ .NetworkSettings.IPAddress }}\" ${POSTGRES_DOCKER_NAME}` -e PGUSER=postgres postgres:${POSTGRES_VERSION} pg_restore -d postgres /backup/${DUMP_FILE}"
  exec $RESTORE_COMMAND || error_and_quit "Failed to launch this command: ${CMD}"
}

test_start() {
  if test -z "$GISSMO_VERSION"; then
    error_and_quit "No Gissmo version given (GISSMO_VERSION in config file)."
  fi
  if test -z "$GISSMO_DOCKER_PORT"; then
    error_and_quit "No Gissmo Docker container port given (GISSMO_DOCKER_PORT in config file)."
  fi
  test_postgresql_exists
}

start() {
  test_start
  # Build Gissmo Docker images if missing
  if [[ "$($docker_cmd images -q gissmo:${GISSMO_VERSION} 2> /dev/null)" == "" ]]; then
    cd $GISSMO_DIR
    $docker_cmd build -t gissmo:${GISSMO_VERSION} . || error_and_quit "Failed to build Gissmo Docker container."
    cd $CURRENT_DIR
  fi
  # Check postgreSQL Docker container exists and is launched.
  test_postgresql_launched
  if [ $? -eq 1 ]; then
    $docker_cmd start ${POSTGRES_DOCKER_NAME}
  fi
  # Run existing Docker container, otherwise create a new one
  GISSMO_RUNNING=$($docker_cmd inspect --format="{{ .State.Running }}" ${GISSMO_DOCKER_NAME} 2> /dev/null)
  if [ $? -eq 1 ]; then
    $docker_cmd run -it --rm --link ${POSTGRES_DOCKER_NAME}:db -p ${GISSMO_DOCKER_PORT}:8000 --name ${GISSMO_DOCKER_NAME} gissmo:${GISSMO_VERSION} $ARGS || error_and_quit "Failed to create and launch ${GISSMO_DOCKER_NAME} container."
  else
    error_and_quit "${GISSMO_DOCKER_NAME} is already launched!"
  fi
}

test_stop(){
  GISSMO_RUNNING=$($docker_cmd inspect --format="{{ .State.Running }}" ${GISSMO_DOCKER_NAME})
  if [ $? -eq 1 ]; then
    error_and_quit "Gissmo Docker container not found: ${GISSMO_DOCKER_NAME}. Please launch '$PROGRAM launch' first."
  fi
}

stop() {
  $docker_cmd stop $GISSMO_DOCKER_NAME || error_and_quit "Failed to stop $GISSMO_DOCKER_NAME Docker container."
  info "${GISSMO_DOCKER_NAME} Docker container stopped successfully."
}



# 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