#!/usr/bin/env bash

# This script parses arguments that were passed to ffmpeg-android-maker.sh
# and exports a bunch of varables that are used elsewhere.

# Local variables with default values (except ABIS_TO_BUILD).
# Can be overridden with specific arguments.
# See the end of this file for more description.
ABIS_TO_BUILD=()
API_LEVEL=16
SOURCE_TYPE=TAR
SOURCE_VALUE=4.3.1
BINUTILS=gnu
EXTERNAL_LIBRARIES=()
FFMPEG_GPL_ENABLED=false

# All FREE libraries that are supported
SUPPORTED_LIBRARIES_FREE=(
  "libaom"
  "libdav1d"
  "libmp3lame"
  "libopus"
  "libtwolame"
  "libspeex"
  "libvpx"
  "libfreetype"
  "libfribidi"
)

# All GPL libraries that are supported
SUPPORTED_LIBRARIES_GPL=(
  "libx264"
)

for argument in "$@"; do
  case $argument in
  # Build for only specified ABIs (separated by comma)
  --target-abis=* | -abis=*)
    IFS=',' read -ra ABIS <<<"${argument#*=}"
    for abi in "${ABIS[@]}"; do
      case $abi in
      x86 | x86_64 | armeabi-v7a | arm64-v8a)
        ABIS_TO_BUILD+=("$abi")
        ;;
      arm)
        ABIS_TO_BUILD+=("armeabi-v7a")
        ;;
      arm64)
        ABIS_TO_BUILD+=("arm64-v8a")
        ;;
      *)
        echo "Unknown ABI: $abi"
        ;;
      esac
    done
    ;;
  # Use this value as Android platform version during compilation.
  --android-api-level=* | -android=*)
    API_LEVEL="${argument#*=}"
    ;;
  # Checkout the particular tag in the FFmpeg's git repository
  --source-git-tag=*)
    SOURCE_TYPE=GIT_TAG
    SOURCE_VALUE="${argument#*=}"
    ;;
  # Checkout the particular branch in the FFmpeg's git repository
  --source-git-branch=*)
    SOURCE_TYPE=GIT_BRANCH
    SOURCE_VALUE="${argument#*=}"
    ;;
  # Download the particular tar archive by its version
  --source-tar=*)
    SOURCE_TYPE=TAR
    SOURCE_VALUE="${argument#*=}"
    ;;
  # Which binutils to use (gnu or llvm)
  --binutils=* | -binutils=*)
    binutils_value="${argument#*=}"
    case $binutils_value in
    gnu | llvm)
      BINUTILS=$binutils_value
      ;;
    *)
      echo "Unknown binutils: $binutils_value"
      ;;
    esac
    ;;
  # Arguments below enable certain external libraries to build into FFmpeg
  --enable-libaom | -aom)
    EXTERNAL_LIBRARIES+=("libaom")
    ;;
  --enable-libdav1d | -dav1d)
    EXTERNAL_LIBRARIES+=("libdav1d")
    ;;
  --enable-libmp3lame | -mp3lame | -lame)
    EXTERNAL_LIBRARIES+=("libmp3lame")
    ;;
  --enable-libopus | -opus)
    EXTERNAL_LIBRARIES+=("libopus")
    ;;
  --enable-libwavpack | -wavpack)
    EXTERNAL_LIBRARIES+=("libwavpack")
    ;;
  --enable-libtwolame | -twolame)
    EXTERNAL_LIBRARIES+=("libtwolame")
    ;;
  --enable-libspeex | -speex)
    EXTERNAL_LIBRARIES+=("libspeex")
    ;;
  --enable-libvpx | -vpx)
    EXTERNAL_LIBRARIES+=("libvpx")
    ;;
  --enable-libfreetype | -freetype)
    EXTERNAL_LIBRARIES+=("libfreetype")
    ;;
  --enable-libfribidi | -fribidi)
    EXTERNAL_LIBRARIES+=("libfribidi")
    ;;
  --enable-libx264 | -x264)
    EXTERNAL_LIBRARIES+=("libx264")
    FFMPEG_GPL_ENABLED=true
    ;;
  --enable-all-free | -all-free)
    EXTERNAL_LIBRARIES+=" ${SUPPORTED_LIBRARIES_FREE[@]}"
    ;;
  --enable-all-gpl | -all-gpl)
    EXTERNAL_LIBRARIES+=" ${SUPPORTED_LIBRARIES_GPL[@]}"
    FFMPEG_GPL_ENABLED=true
    ;;
  *)
    echo "Unknown argument $argument"
    ;;
  esac
  shift
done

# if ABIS_TO_BUILD list is empty, then fill it with all supported ABIs
# The x86 is the first, because it is more likely to have Text Relocations.
# In this case the rest ABIs will not be assembled at all.
if [ ${#ABIS_TO_BUILD[@]} -eq 0 ]; then
  ABIS_TO_BUILD=("x86" "x86_64" "armeabi-v7a" "arm64-v8a")
fi
# The FFmpeg will be build for ABIs in this list
export FFMPEG_ABIS_TO_BUILD=${ABIS_TO_BUILD[@]}

# Saving the information FFmpeg's source code downloading
export FFMPEG_SOURCE_TYPE=$SOURCE_TYPE
export FFMPEG_SOURCE_VALUE=$SOURCE_VALUE

# A list of external libraries to build into the FFmpeg
# Elements from this list are used for strings substitution
export FFMPEG_EXTERNAL_LIBRARIES=${EXTERNAL_LIBRARIES[@]}

# Desired Android API level to use during compilation
# Will be replaced with 21 for 64bit ABIs if the value is less than 21
export DESIRED_ANDROID_API_LEVEL=${API_LEVEL}
export DESIRED_BINUTILS=${BINUTILS}