#!/bin/sh
# Exosite configuration helper script

# Copyright (c) 2017 Exosite
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of this
# software and associated documentation files (the "Software"), to deal in the
# Software without restriction, including without limitation the rights to use, copy,
# modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so, subject to the
# following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
# INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
# PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
# CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
# OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

PROG=$(basename $0)

function usage() #{{{
{
  echo "$PROG - Environment helper script for exosite-cli."
  echo ""
  echo "usage:"
  echo "  $PROG ENV_LABEL"
  echo ""
  echo "ENV_LABEL = An exosite-cli environment label that will become a symlink"
  echo "            to a configuration file for the specified environment."
  echo ""
  echo "            Example:"
  echo "              ENV_LABEL=dev"
  echo "            Creates a symlink:"
  echo "              .Solutionfile.secret -> .Solutionfile.secret.dev"
  echo ""
}
#}}}

if [ -z "$1" ]; then
  usage
  exit 1
fi

ENV_LABEL="$1"

BASE_FILE=".Solutionfile.secret"
NEW_FILE="${BASE_FILE}.${ENV_LABEL}"
if [ ! -r "$BASE_FILE" -a ! -h "$BASE_FILE" -a ! -r "$NEW_FILE" ]; then
  if [ ! -r "$NEW_FILE" ]; then
    echo "$NEW_FILE does NOT exist."
    if [ ! -r "$BASE_FILE" ]; then
      echo "Missing: $BASE_FILE"
      echo "Execute:"
      echo "  exosite --init"
    fi
  else
    echo "Missing: $BASE_FILE"
    echo "Execute:"
    echo "  exosite --init"
  fi
  echo "Aborting..."
  exit 1
fi

if [ ! -r "$NEW_FILE" ]; then
  if [ -h "$BASE_FILE" ]; then
    echo "$NEW_FILE does NOT exist."  # and $BASE_FILE is already symlinked."
    OLD_FILE=$(readlink $BASE_FILE)
    if [ "$OLD_FILE" == "$NEW_FILE" ]; then
      echo "$BASE_FILE is symlinked to non-existent file $NEW_FILE"
      # rm $BASE_FILE
      # echo "Removed unresolved symlink $BASE_FILE"
    fi
    echo "Aborting..."
    exit 1
  elif [ ! -r "$BASE_FILE" ]; then
    echo "$BASE_FILE and $NEW_FILE do NOT exist."
    echo "Aborting..."
    exit 1
  fi
  echo "Moving $BASE_FILE to $NEW_FILE ..."
  mv $BASE_FILE $NEW_FILE
  echo "Creating $ENV_LABEL symlink for $NEW_FILE ..."
  ln -sf $NEW_FILE $BASE_FILE
  echo "Changed exosite-cli environment to $ENV_LABEL"
else
  if [ -h "$BASE_FILE" ]; then
    OLD_FILE=$(readlink $BASE_FILE)
    if [ "$OLD_FILE" == "$NEW_FILE" ]; then
      echo "exosite-cli environment is already $ENV_LABEL"
      exit 0
    fi
    echo "Replacing existing symlink to file $OLD_FILE with $NEW_FILE"
  elif [ -r "$BASE_FILE" ]; then
    echo "Moving existing file $BASE_FILE to ${BASE_FILE}.old"
    mv $BASE_FILE ${BASE_FILE}.old
    if [ $? -ne 0 ]; then
      echo "Environment change aborted: Failed to save backup configuration."
      exit 1
    fi
  fi
  ln -sf $NEW_FILE $BASE_FILE
  echo "Changed exosite-cli environment to $ENV_LABEL"
fi

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