#!/usr/bin/env bash
# Copyright (C) 2023 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

# This script will build and install FFmpeg static libs
set -ex
os="$1"
build_type="$2"

if [ ! -n "$build_type" ] && [ "$build_type" != "static" ] && [ "$build_type" != "shared" ]; then
  >&2 echo "Invalid build_type: $build_type. The shared build type will be used."
  build_type="shared"
fi

# shellcheck source=../unix/InstallFromCompressedFileFromURL.sh
source "${BASH_SOURCE%/*}/../unix/InstallFromCompressedFileFromURL.sh"
# shellcheck source=../unix/SetEnvVar.sh
source "${BASH_SOURCE%/*}/../unix/SetEnvVar.sh"

version="n7.1"
url_public="https://github.com/FFmpeg/FFmpeg/archive/refs/tags/$version.tar.gz"
sha1="f008a93710a7577e3f85a90f4b632cc615164712"
url_cached="http://ci-files01-hki.ci.qt.io/input/ffmpeg/$version.tar.gz"
ffmpeg_name="FFmpeg-$version"

target_dir="$HOME"
app_prefix=""
ffmpeg_source_dir="$target_dir/$ffmpeg_name"

if [ ! -d "$ffmpeg_source_dir" ]
then
   InstallFromCompressedFileFromURL "$url_cached" "$url_public" "$sha1" "$target_dir" "$app_prefix"
fi

ffmpeg_config_options=$(cat "${BASH_SOURCE%/*}/../shared/ffmpeg_config_options.txt")
if [ "$build_type" != "static" ]; then
  ffmpeg_config_options+=" --enable-shared --disable-static"
fi

install_ff_nvcodec_headers() {
  nv_codec_version="11.1" # use 11.1 to ensure compatibility with 470 nvidia drivers; might be upated to 12.0
  nv_codec_url_public="https://github.com/FFmpeg/nv-codec-headers/archive/refs/heads/sdk/$nv_codec_version.zip"
  nv_codec_url_cached="http://ci-files01-hki.ci.qt.io/input/ffmpeg/nv-codec-headers/nv-codec-headers-sdk-$nv_codec_version.zip"
  nv_codec_sha1="ceb4966ab01b2e41f02074675a8ac5b331bf603e"
  #nv_codec_sha1="4f30539f8dd31945da4c3da32e66022f9ca59c08" // 12.0
  nv_codec_dir="$target_dir/nv-codec-headers-sdk-$nv_codec_version"
  if [ ! -d  "$nv_codec_dir" ]
  then
    InstallFromCompressedFileFromURL "$nv_codec_url_cached" "$nv_codec_url_public" "$nv_codec_sha1" "$target_dir" ""
  fi

  sudo make -C "$nv_codec_dir" install -j

  # Might be not detected by default on RHEL
  export PKG_CONFIG_PATH="$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig"
}

fix_openssl3_pc_files() {
  # On RHEL 8, openssl3 pc files are libopenssl3.pc, libssl3.pc, libcrypto3.pc,
  # and FFmpeg cannot find them. Instead, it finds FFmpeg 1.x.x if it's installed.
  # The function fixes the files with copying them to a custom directory

  local openssl3_pcfiledir=$(pkg-config --variable=pcfiledir openssl3)
  if [ ! -n  "$openssl3_pcfiledir" ]; then
    return
  fi

  local pcfiles=("libssl" "libcrypto" "openssl")

  for pcfile in ${pcfiles[@]}; do
    if [ ! -f "$openssl3_pcfiledir/${pcfile}3.pc" ]; then
      echo "pkgconfig has found openssl3 but the file $openssl3_pcfiledir/${pcfile}3.pc does't exist"
      return
    fi
  done

  local new_pkgconfig_dir="$ffmpeg_source_dir/openssl3_pkgconfig"
  mkdir -p $new_pkgconfig_dir

  for pcfile in ${pcfiles[@]}; do
    sed -E '/^Requires(\.private)?:/s/ (libssl|libcrypto)3/ \1/g;' "$openssl3_pcfiledir/${pcfile}3.pc" > "$new_pkgconfig_dir/${pcfile}.pc"
  done

  export PKG_CONFIG_PATH="$new_pkgconfig_dir:$PKG_CONFIG_PATH"
}

build_ffmpeg() {
  local arch="$1"
  local prefix="$2"
  local build_dir="$ffmpeg_source_dir/build/$arch"
  mkdir -p "$build_dir"
  pushd "$build_dir"

  if [ -z  "$prefix" ]
  then prefix="/usr/local/$ffmpeg_name"
  fi

  if [ -n "$arch" ]
  then cc="clang -arch $arch"
  fi

  # shellcheck disable=SC2086
  if [ -n "$arch" ]
  then "$ffmpeg_source_dir/configure" $ffmpeg_config_options --prefix="$prefix" --enable-cross-compile --arch="$arch" --cc="$cc"
  else "$ffmpeg_source_dir/configure" $ffmpeg_config_options --prefix="$prefix"
  fi
  make install DESTDIR="$build_dir/installed" -j4
  popd
}

if [ "$os" == "linux" ]; then
  install_ff_nvcodec_headers

  ffmpeg_config_options+=" --enable-openssl"
  fix_openssl3_pc_files
  echo "pkg-config openssl version: $(pkg-config --modversion openssl)"

  build_ffmpeg

  output_dir="$ffmpeg_source_dir/build/installed/usr/local/$ffmpeg_name"

  if [ "$build_type" != "static" ]; then
    fix_dependencies="${BASH_SOURCE%/*}/../shared/fix_ffmpeg_dependencies.sh"
    "$fix_dependencies" "$output_dir"
  fi

  sudo mv "$output_dir" "/usr/local"
  SetEnvVar "FFMPEG_DIR" "/usr/local/$ffmpeg_name"

elif [ "$os" == "macos" ] || [ "$os" == "macos-universal" ]; then
  brew install yasm
  export MACOSX_DEPLOYMENT_TARGET=12
  fix_relative_dependencies="${BASH_SOURCE%/*}/../macos/fix_relative_dependencies.sh"

  xcode_major_version=$(xcodebuild -version | awk 'NR==1 {split($2, a, "."); print a[1]}')
  if [ "$xcode_major_version" -ge 15 ]; then
    # fix the error: duplicate symbol '_av_ac3_parse_header'
    ffmpeg_config_options+=" --extra-ldflags=-Wl,-ld_classic"
  fi

  if [ "$os" == "macos"  ]; then
    build_ffmpeg
    install_dir="$ffmpeg_source_dir/build/installed"
    "$fix_relative_dependencies" "$install_dir/usr/local/$ffmpeg_name/lib"
    sudo mv "$install_dir/usr/local/$ffmpeg_name" "/usr/local"
  else
    build_ffmpeg "arm64"
    build_ffmpeg "x86_64"

    arm64_install_dir="$ffmpeg_source_dir/build/arm64/installed"
    x86_64_install_dir="$ffmpeg_source_dir/build/x86_64/installed"

    "$fix_relative_dependencies" "$arm64_install_dir/usr/local/$ffmpeg_name/lib"
    "$fix_relative_dependencies" "$x86_64_install_dir/usr/local/$ffmpeg_name/lib"

    sudo "${BASH_SOURCE%/*}/../macos/makeuniversal.sh" "$arm64_install_dir" "$x86_64_install_dir"
  fi

  SetEnvVar "FFMPEG_DIR" "/usr/local/$ffmpeg_name"
fi