#!/usr/bin/env bash

set -ex

. $(dirname $0)/osx_helpers.sh

DEPLOYMENT_TARGET=${DEPLOYMENT_TARGET:-"$(macos_version)"}
SDK_FETCH=
if ! [ ${DEPLOYMENT_TARGET} == "$(macos_version)" ]; then
  SDK_FETCH=1
  # SDK URL from https://github.com/docker/golang-cross/blob/master/osx-cross.sh
  SDK_URL=https://s3.dockerproject.org/darwin/v2/MacOSX${DEPLOYMENT_TARGET}.sdk.tar.xz
  SDK_SHA1=dd228a335194e3392f1904ce49aff1b1da26ca62
fi

OPENSSL_VERSION=1.1.1c
OPENSSL_URL=https://www.openssl.org/source/openssl-${OPENSSL_VERSION}.tar.gz
OPENSSL_SHA1=71b830a077276cbeccc994369538617a21bee808

PYTHON_VERSION=3.7.4
PYTHON_URL=https://www.python.org/ftp/python/${PYTHON_VERSION}/Python-${PYTHON_VERSION}.tgz
PYTHON_SHA1=fb1d764be8a9dcd40f2f152a610a0ab04e0d0ed3

#
# Install prerequisites.
#
if ! [ -x "$(command -v brew)" ]; then
  ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
fi
if ! [ -x "$(command -v grealpath)" ]; then
  brew update > /dev/null
  brew install coreutils
fi
if ! [ -x "$(command -v python3)" ]; then
  brew update > /dev/null
  brew install python3
fi
if ! [ -x "$(command -v virtualenv)" ]; then
  pip install virtualenv==16.2.0
fi

#
# Create toolchain directory.
#
BUILD_PATH="$(grealpath $(dirname $0)/../../build)"
mkdir -p ${BUILD_PATH}
TOOLCHAIN_PATH="${BUILD_PATH}/toolchain"
mkdir -p ${TOOLCHAIN_PATH}

#
# Set macOS SDK.
#
if [[ ${SDK_FETCH} && ! -f ${TOOLCHAIN_PATH}/MacOSX${DEPLOYMENT_TARGET}.sdk/SDKSettings.plist ]]; then
  SDK_PATH=${TOOLCHAIN_PATH}/MacOSX${DEPLOYMENT_TARGET}.sdk
  fetch_tarball ${SDK_URL} ${SDK_PATH} ${SDK_SHA1}
else
  SDK_PATH="$(xcode-select --print-path)/Platforms/MacOSX.platform/Developer/SDKs/MacOSX${DEPLOYMENT_TARGET}.sdk"
fi

#
# Build OpenSSL.
#
OPENSSL_SRC_PATH=${TOOLCHAIN_PATH}/openssl-${OPENSSL_VERSION}
if ! [[ $(${TOOLCHAIN_PATH}/bin/openssl version) == *"${OPENSSL_VERSION}"* ]]; then
  rm -rf ${OPENSSL_SRC_PATH}
  fetch_tarball ${OPENSSL_URL} ${OPENSSL_SRC_PATH} ${OPENSSL_SHA1}
  (
    cd ${OPENSSL_SRC_PATH}
    export MACOSX_DEPLOYMENT_TARGET=${DEPLOYMENT_TARGET}
    export SDKROOT=${SDK_PATH}
    ./Configure darwin64-x86_64-cc --prefix=${TOOLCHAIN_PATH}
    make install_sw install_dev
  )
fi

#
# Build Python.
#
PYTHON_SRC_PATH=${TOOLCHAIN_PATH}/Python-${PYTHON_VERSION}
if ! [[ $(${TOOLCHAIN_PATH}/bin/python3 --version) == *"${PYTHON_VERSION}"* ]]; then
  rm -rf ${PYTHON_SRC_PATH}
  fetch_tarball ${PYTHON_URL} ${PYTHON_SRC_PATH} ${PYTHON_SHA1}
  (
    cd ${PYTHON_SRC_PATH}
    ./configure --prefix=${TOOLCHAIN_PATH} \
      --enable-ipv6 --without-ensurepip --with-dtrace --without-gcc \
      --datarootdir=${TOOLCHAIN_PATH}/share \
      --datadir=${TOOLCHAIN_PATH}/share \
      --enable-framework=${TOOLCHAIN_PATH}/Frameworks \
      --with-openssl=${TOOLCHAIN_PATH} \
      MACOSX_DEPLOYMENT_TARGET=${DEPLOYMENT_TARGET} \
      CFLAGS="-isysroot ${SDK_PATH} -I${TOOLCHAIN_PATH}/include" \
      CPPFLAGS="-I${SDK_PATH}/usr/include -I${TOOLCHAIN_PATH}/include" \
      LDFLAGS="-isysroot ${SDK_PATH} -L ${TOOLCHAIN_PATH}/lib"
    make -j 4
    make install PYTHONAPPSDIR=${TOOLCHAIN_PATH}
    make frameworkinstallextras PYTHONAPPSDIR=${TOOLCHAIN_PATH}/share
  )
fi

#
# Smoke test built Python.
#
openssl_version ${TOOLCHAIN_PATH}

echo ""
echo "*** Targeting macOS: ${DEPLOYMENT_TARGET}"
echo "*** Using SDK ${SDK_PATH}"
echo "*** Using $(python3_version ${TOOLCHAIN_PATH})"
echo "*** Using $(openssl_version ${TOOLCHAIN_PATH})"