#!/usr/bin/env bash
#
# Copyright 2022-2024 Gauthier Dandele
#
# Licensed under the MIT License,
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://opensource.org/licenses/MIT.
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

usage() {
  cat << EOL
Usage: $0 [options]

Options:
  --help              display this help and exit
  --flow-file         the file containing the flows, default: 'flows.json'
  --user-dir          the user directory containing the flows, default: '~/.node-red'
  --no-remove-backup  do not remove the backup file after migration
  --only-breaking     only resolve breaking changes
EOL
}

REMOVE_BACKUP=true

USER_DIR="~/.node-red"
FLOW_FILE="flows.json"

if [ $# -gt 0 ]; then
  # Parsing parameters
  while [ "$#" -gt 0 ]; do
    case "$1" in
      --help)
        usage && exit 0
        shift
        ;;
      --flow-file) # the file containing the flows
        if [ -n "$2" ] && [ ${2:0:1} != "-" ]; then
          FLOW_FILE=$2
          shift 2
        else
          echo "Error: Argument for $1 is missing" >&2
          exit 1
        fi
        ;;
      --user-dir) # the user directory containing the flows
        if [ -n "$2" ] && [ ${2:0:1} != "-" ]; then
          USER_DIR=$2
          shift 2
        else
          echo "Error: Argument for $1 is missing" >&2
          exit 1
        fi
        ;;
      --no-remove-backup) # do not remove the backup file after migration
        REMOVE_BACKUP=false
        shift
        ;;
      --only-breaking) # only resolve breaking changes
        ONLY_BREAKING="y"
        shift
        ;;
      --) # end argument parsing
        shift
        break
        ;;
      -y) # automatic yes to prompts
        CONFIRM_INSTALL="y"
        shift
        ;;
      -*|--*=) # unsupported flags
        echo "Error: Unsupported flag $1" >&2
        exit 1
        ;;
    esac
  done
fi

# helper function to test for existance of node and npm
function HAS_NODE {
  if [ -x "$(command -v node)" ]; then return 0; else return 1; fi
}

echo "Welcome to the Migration Wizard!"
echo " "
echo "This script will help you to resolve the 'missing type' error."
echo " "
echo "It will start by backing up your current flow file to a file called 'migration.flows.json.backup'."
echo "Then it will analyze your flow file and attempt to resolve missing type errors."
echo "May be optional, it will resolve non-breaking changes."
echo "Finally, it will delete the backup of your flow file if the migration was successful."
echo " "
echo "You can ignore the backup deletion by using the --no-remove-backup option"
echo " "
echo "You can also specify the flow file to analyze using the --flow-file option, default: 'flows.json'"
echo " "
echo "And you can also specify the user directory containing the flows using the --user-dir option, default: '~/.node-red'"
echo " "
echo "See the optional parameters by re-running this command with --help"
echo " "
echo " "

if HAS_NODE; then
  : # Node.js is installed
else
  echo "Node.js is not installed!"
  echo -e "Please install Node.js and run the script again to continue.\r\n\r\n"
  exit 2
fi

echo "The flow file that the script will analyze is: '$FLOW_FILE' in the user directory: '$USER_DIR'"
echo " "

yn="${CONFIRM_INSTALL}"
[ ! "${yn}" ] && read -p "Are you really sure you want to do this ? [y/N] ? " yn
case $yn in
  [Yy]* )
  ;;
  * )
    echo "Operation aborted."
    exit 1
  ;;
esac

response="${ONLY_BREAKING:-${CONFIRM_INSTALL:+no}}"
[ ! "${response}" ] && read -p "Do you want to ONLY resolve breaking changes ? [y/N] ? " response
case $response in
  [Yy]* )
    ONLY_BREAKING=true
  ;;
  * )
    ONLY_BREAKING=false
  ;;
esac

FLOW_FILE=$FLOW_FILE USER_DIR=$USER_DIR REMOVE_BACKUP=$REMOVE_BACKUP ONLY_BREAKING=$ONLY_BREAKING node ./scripts/migration-wizard.js

exit 0