#!/bin/bash -e
#
# Copyright 2018-present The Material Components for iOS Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# 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() {
  echo "Usage: $0 <ComponentName> <path_to_.template_file> <destination>"
  echo
  echo "Copies the template into the component directory and replaces all of the symbols defined"
  echo "in the component's .vars file."
  echo
  echo ".vars files should be placed in the root of the component's directory."
  echo "Example: components/ActivityIndicator/.vars"
  echo
  echo "Each line of the .vars file should be of the form symbol=replacement."
  echo "Example:"
  echo "component=ActivityIndicator"
  echo "component_name=Activity Indicator"
  echo
  echo "This script will replace all instances of <#symbol#> in the .template with the given"
  echo "replacement."
  echo
  echo "Example usage: $0 scripts/templates/component/docs/color-theming.md.template components/ActivityIndicator/docs/color-theming.md"
}

if [ "$#" -ne 3 ]; then
  usage
  exit 1
fi

COMPONENT="$1"
TEMPLATE_PATH="$2"
DESTINATION_PATH="$3"

if [ ! -f "$TEMPLATE_PATH" ]; then
  echo "$TEMPLATE_PATH is not a file."
  echo
  usage
  exit 1
fi

mkdir -p $(dirname "$DESTINATION_PATH")

COMPONENT_VARS="components/$COMPONENT/.vars"

cp "$TEMPLATE_PATH" "$DESTINATION_PATH"

cat $COMPONENT_VARS | grep -v "^#" | while read line; do
  variable=$(echo "$line" | cut -d'=' -f1)
  replacement=$(echo "$line" | cut -d'=' -f2-)

  echo "Replacing <#$variable#> with $replacement..."

  perl -pi -e "s|<#$variable#>|$replacement|g" "$DESTINATION_PATH"
done