#!/bin/bash

##
# Copyright IBM Corporation 2016,2018
#
# 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.
##

# This script installs the Swift binaries. The following variable
# must be set for this script to work:
#   SWIFT_SNAPSHOT - version of the Swift binaries to install.

# If any commands fail, we want the shell script to exit immediately.
set -e

# Echo commands before executing them.
#set -o verbose

echo ">> Running ${BASH_SOURCE[0]}"

# Suppress prompts of any kind while executing apt-get
export DEBIAN_FRONTEND="noninteractive"

# Find the first numeric value in the swift version string. For example:
# swift-5.0-DEVELOPMENT-SNAPSHOT-1234-56-78-a  -> 5
# 4.0.3 -> 4
swiftMajor=`echo $SWIFT_SNAPSHOT | sed -e's#[^0-9]*\([0-9]\).*#\1#'`

# Get the Ubuntu ID and VERSION_ID from /etc/os-release, stripping quotes
distribution=`grep '^ID=' /etc/os-release | sed -e's#.*="\?\([^"]*\)"\?#\1#'`
version=`grep '^VERSION_ID=' /etc/os-release | sed -e's#.*="\?\([^"]*\)"\?#\1#'`
version_no_dots=`echo $version | awk -F. '{print $1$2}'`
versionMajor=`echo $version | awk -F. '{print $1}'`
export UBUNTU_VERSION="${distribution}${version}"
export UBUNTU_VERSION_NO_DOTS="${distribution}${version_no_dots}"

# Customize package dependencies based on Ubuntu version
case $versionMajor in
14)
  libCurlPackage="libcurl3"
  gccPackageVersion="4.8"
  ;;
15|16|17)
  libCurlPackage="libcurl3"
  gccPackageVersion="5"
  ;;
*)
  libCurlPackage="libcurl4"
  gccPackageVersion="5"
  ;;
esac

# Install prerequisites for this version of Swift
sudo -E apt-get -q update
case $swiftMajor in
3|4)
  sudo -E apt-get -y -q install \
    libcurl4-openssl-dev \
    libssl-dev \
    clang \
    lldb-3.8 \
    libicu-dev \
    libtool \
    libbsd-dev \
    build-essential \
    uuid-dev \
    tzdata \
    libz-dev \
    libblocksruntime-dev
  ;;
*)
  sudo -E apt-get -y -q install \
    libcurl4-openssl-dev \
    libssl-dev \
    libatomic1 \
    libbsd0 \
    ${libCurlPackage} \
    libxml2 \
    libedit2 \
    libsqlite3-0 \
    libc6-dev \
    binutils \
    libgcc-${gccPackageVersion}-dev \
    libstdc++-${gccPackageVersion}-dev \
    libpython2.7 \
    tzdata \
    pkg-config
  ;;
esac

echo ">> Installing '${SWIFT_SNAPSHOT}'..."
# Install Swift compiler
cd $projectFolder
wget --progress=dot:giga https://swift.org/builds/$SNAPSHOT_TYPE/$UBUNTU_VERSION_NO_DOTS/$SWIFT_SNAPSHOT/$SWIFT_SNAPSHOT-$UBUNTU_VERSION.tar.gz
tar xzf $SWIFT_SNAPSHOT-$UBUNTU_VERSION.tar.gz
export PATH=$projectFolder/$SWIFT_SNAPSHOT-$UBUNTU_VERSION/usr/bin:$PATH
rm $SWIFT_SNAPSHOT-$UBUNTU_VERSION.tar.gz