#!/bin/bash
# Copyright (c) Meta Platforms, Inc. and affiliates.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.

if [ "$DEBUG" = true ]; then
  BUILD_TYPE="Debug"
else
  BUILD_TYPE="Release"
fi

NUM_CORES=$(sysctl -n hw.ncpu)
IMPORT_HERMESC_PATH=${HERMES_OVERRIDE_HERMESC_PATH:-$PWD/build_host_hermesc/ImportHermesc.cmake}
REACT_NATIVE_PATH=${REACT_NATIVE_PATH:-$PWD/../..}
JSI_PATH="$REACT_NATIVE_PATH/ReactCommon/jsi"

function get_release_version {
  ruby -rcocoapods-core -rjson -e "puts Pod::Specification.from_file('hermes-engine.podspec').version"
}

function get_ios_deployment_target {
  ruby -rcocoapods-core -rjson -e "puts Pod::Specification.from_file('hermes-engine.podspec').deployment_target('ios')"
}

function get_mac_deployment_target {
  ruby -rcocoapods-core -rjson -e "puts Pod::Specification.from_file('hermes-engine.podspec').deployment_target('osx')"
}

# Build host hermes compiler for internal bytecode
function build_host_hermesc {
  cmake -S . -B build_host_hermesc
  cmake --build ./build_host_hermesc --target hermesc -j ${NUM_CORES}
}

# Utility function to configure an Apple framework
function configure_apple_framework {
  local build_cli_tools enable_bitcode xcode_15_flags xcode_major_version

  if [[ $1 == iphoneos || $1 == catalyst ]]; then
    enable_bitcode="true"
  else
    enable_bitcode="false"
  fi
  if [[ $1 == macosx ]]; then
    build_cli_tools="true"
  else
    build_cli_tools="false"
  fi

  xcode_15_flags=""
  xcode_major_version=$(xcodebuild -version | grep -oE '[0-9]*' | head -n 1)
  if [[ $xcode_major_version -ge 15 ]]; then
    xcode_15_flags="LINKER:-ld_classic"
  fi

  cmake -S . -B "build_$1" \
    -DHERMES_EXTRA_LINKER_FLAGS="$xcode_15_flags" \
    -DHERMES_APPLE_TARGET_PLATFORM:STRING="$1" \
    -DCMAKE_OSX_ARCHITECTURES:STRING="$2" \
    -DCMAKE_OSX_DEPLOYMENT_TARGET:STRING="$3" \
    -DHERMES_ENABLE_DEBUGGER:BOOLEAN=true \
    -DHERMES_ENABLE_INTL:BOOLEAN=true \
    -DHERMES_ENABLE_LIBFUZZER:BOOLEAN=false \
    -DHERMES_ENABLE_FUZZILLI:BOOLEAN=false \
    -DHERMES_ENABLE_TEST_SUITE:BOOLEAN=false \
    -DHERMES_ENABLE_BITCODE:BOOLEAN="$enable_bitcode" \
    -DHERMES_BUILD_APPLE_FRAMEWORK:BOOLEAN=true \
    -DHERMES_BUILD_APPLE_DSYM:BOOLEAN=true \
    -DHERMES_ENABLE_TOOLS:BOOLEAN="$build_cli_tools" \
    -DIMPORT_HERMESC:PATH="$IMPORT_HERMESC_PATH" \
    -DJSI_DIR="$JSI_PATH" \
    -DHERMES_RELEASE_VERSION="for RN $(get_release_version)" \
    -DCMAKE_INSTALL_PREFIX:PATH=../destroot \
    -DCMAKE_BUILD_TYPE="$BUILD_TYPE"
}

# Utility function to build an Apple framework
function build_apple_framework {
  echo "Building framework for $1 with architectures: $2"

  # Only build host HermesC if no file found at $IMPORT_HERMESC_PATH
  [ ! -f "$IMPORT_HERMESC_PATH" ] &&
  build_host_hermesc

  # Confirm ImportHermesc.cmake is now available.
  [ ! -f "$IMPORT_HERMESC_PATH" ] &&
  echo "Host hermesc is required to build apple frameworks!"

  configure_apple_framework "$1" "$2" "$3"
  cmake --build "./build_$1" --target install/strip -j ${NUM_CORES}
}

# Accepts an array of frameworks and will place all of
# the architectures into an universal folder and then remove
# the merged frameworks from destroot
function create_universal_framework {
  cd ./destroot/Library/Frameworks || exit 1

  local platforms=("$@")
  local args=""

  echo "Creating universal framework for platforms: ${platforms[*]}"

  for i in "${!platforms[@]}"; do
    args+="-framework ${platforms[$i]}/hermes.framework "
  done

  mkdir universal
  # shellcheck disable=SC2086
  xcodebuild -create-xcframework $args -output "universal/hermes.xcframework"

  for platform in "$@"; do
    rm -r "$platform"
  done

  cd - || exit 1
}