#!/usr/bin/env bash
# Build libvpx for Android ABIs and produce libvpx.a for ANDROIDCAST_LIBVPX_LIB.
#
# Prerequisites:
#   git submodule update --init third-party/libvpx
#   Android NDK (ndk.dir in local.properties)
#
# Usage:
#   ./scripts/build-native-codecs.sh arm64-v8a
#   ANDROIDCAST_LIBVPX_LIB=$PWD/build/native/arm64-v8a/libvpx.a ./gradlew assembleDebug
#
# Note: libvpx Makefiles do not support spaces in paths (SRC_PATH_BARE). If the repo
# path contains spaces, this script builds under /tmp and copies libvpx.a back.
#
#set -euo pipefail

ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
ABI="${1:-arm64-v8a}"
VPX_SRC_REAL="$ROOT/third-party/libvpx"
PROJECT_OUT="$ROOT/build/native/$ABI"
OUT="$PROJECT_OUT"
BUILD_DIR="$OUT/libvpx-build"

if [[ ! -d "$VPX_SRC_REAL" ]]; then
  echo "ERROR: $VPX_SRC_REAL missing. Run:"
  echo "  git submodule update --init third-party/libvpx"
  exit 1
fi

NDK=""
if [[ -f "$ROOT/local.properties" ]]; then
  NDK="$(sed -n 's/^ndk\.dir=//p' "$ROOT/local.properties" | tr -d '\r' | head -1)"
fi
if [[ -z "$NDK" && -n "${ANDROID_NDK_HOME:-}" ]]; then
  NDK="$ANDROID_NDK_HOME"
fi
if [[ -z "$NDK" && -n "${ANDROID_NDK_ROOT:-}" ]]; then
  NDK="$ANDROID_NDK_ROOT"
fi
if [[ -z "$NDK" || ! -d "$NDK" ]]; then
  echo "ERROR: Set ndk.dir in local.properties or ANDROID_NDK_HOME"
  exit 1
fi

case "$ABI" in
  arm64-v8a) VPX_TARGET=arm64-android-gcc ;;
  armeabi-v7a) VPX_TARGET=armv7-android-gcc ;;
  x86_64) VPX_TARGET=x86_64-android-gcc ;;
  x86) VPX_TARGET=x86-android-gcc ;;
  *)
    echo "Unsupported ABI: $ABI"
    exit 1
    ;;
esac

# libvpx: include $(SRC_PATH_BARE)/foo.mk breaks when SRC_PATH_BARE has spaces.
path_has_space() {
  case "$1" in
    *" "*) return 0 ;;
    *) return 1 ;;
  esac
}

VPX_SRC="$VPX_SRC_REAL"
STAGING=""
if path_has_space "$ROOT" || path_has_space "$VPX_SRC_REAL"; then
  STAGING="/tmp/androidcast-libvpx-${USER:-build}"
  VPX_SRC="$STAGING/src"
  BUILD_DIR="$STAGING/build/$ABI"
  OUT="$STAGING/out/$ABI"
  mkdir -p "$STAGING/build" "$STAGING/out"
  ln -sfn "$VPX_SRC_REAL" "$VPX_SRC"
  echo "Repo path contains spaces; using space-free staging under $STAGING"
fi

mkdir -p "$BUILD_DIR" "$OUT" "$PROJECT_OUT"
export ANDROID_NDK_ROOT="$NDK"
export PATH="$NDK/toolchains/llvm/prebuilt/linux-x86_64/bin:$PATH"

echo "Building libvpx for $ABI (target=$VPX_TARGET) ..."
echo "  source: $VPX_SRC"
echo "  build:  $BUILD_DIR"

cd "$BUILD_DIR"
if [[ ! -f Makefile ]]; then
  "$VPX_SRC/configure" \
    --target="$VPX_TARGET" \
    --disable-examples \
    --disable-tools \
    --disable-unit-tests \
    --disable-webm-io \
    --enable-vp8 \
    --enable-vp9 \
    --enable-static \
    --disable-shared \
    --extra-cflags="-fPIC -O2" \
    --enable-multi-res-encoding \
    --enable-vp9-temporal-denoising \
    --enable-onthefly-bitpacking \
    --enable-error-concealment \
    --enable-realtime-only \
    --enable-postproc \
    --enable-vp9-postproc \
    --enable-multithread \
    --enable-spatial-resampling \
    --disable-debug-libs \
    --disable-docs \
    --enable-external-build
fi
make -j"$(nproc)" libvpx.a
cp -f libvpx.a "$OUT/libvpx.a"
cp -f "$OUT/libvpx.a" "$PROJECT_OUT/libvpx.a"

echo ""
echo "Built: $PROJECT_OUT/libvpx.a"
if [[ -n "$STAGING" ]]; then
  echo "(staged under $STAGING because of spaces in repo path)"
fi
echo "Rebuild APK with:"
echo "  export ANDROIDCAST_LIBVPX_LIB=$PROJECT_OUT/libvpx.a"
echo "  ./gradlew assembleDebug"