#!/bin/bash
#
# Copyright 2016-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.

SHOULD_ECHO_PATH=0

usage() {
  echo "Usage: $0 [-p]"
  echo
  echo "  -p echo path to the objc-diff binary"
}

# Runs git commands in the objc-diff repository directory.
git_objc_diff() {
  pushd $OBJC_DIFF_REPO_PATH >> /dev/null
  git "$@"
  popd >> /dev/null
}

while getopts "p?" opt; do
  case "$opt" in
  h|\?)
      usage
      exit 0
      ;;
  p)  SHOULD_ECHO_PATH=1
      ;;
  esac
done

SCRIPTS_PATH="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

# Where to fetch the objc-diff repo from
OBJC_DIFF_REPO_URL="https://github.com/jverkoey/objc-diff.git"
OBJC_DIFF_REPO_BRANCH="origin/anonymous"

# Where to install the objc-diff repo
OBJC_DIFF_REPO_PATH="$SCRIPTS_PATH/external/objc-diff"
OBJC_DIFF_BINARY_RELATIVE_PATH="build/Release/objc-diff"
OBJC_DIFF_BINARY_PATH=$OBJC_DIFF_REPO_PATH/$OBJC_DIFF_BINARY_RELATIVE_PATH

if [ "$SHOULD_ECHO_PATH" -eq "1" ]; then
  echo "$OBJC_DIFF_BINARY_PATH"
  exit 0
fi

# Clone/update the objc-diff repo
if [ ! -d "$OBJC_DIFF_REPO_PATH" ]; then
  git clone "$OBJC_DIFF_REPO_URL" "$OBJC_DIFF_REPO_PATH" || { echo "Failed to clone."; exit 1; }
else
  git_objc_diff fetch || { echo "Failed to update objc-diff."; exit 1; }
fi

# Check out the desired branch
git_objc_diff checkout "$OBJC_DIFF_REPO_BRANCH"

# Build objc-diff binary
xcodebuild build \
  -project $OBJC_DIFF_REPO_PATH/OCDiff.xcodeproj \
  -target OCDiff \
  -configuration Release

# Verify objc-diff binary existence
if [ ! -f "$OBJC_DIFF_BINARY_PATH" ]; then
  echo "Unable to find objc-diff at $OBJC_DIFF_BINARY_PATH"
  exit 1
fi