#!/bin/sh
# Builds native/build/RNNoise.xcframework: xiph's RNNoise (BSD-3) as a
# static library for Mac, iPhone and the iPhone simulator.
#
# Built rather than committed, as CallsBridge is: the model's weights come
# as a generated C file of 78 MB (rnnoise_data.c), which is no more source
# than a framework binary is. Both the code and the model are pinned — the
# code to a commit, the model to its SHA-256, which is also its name.
set -eu
cd "$(dirname "$0")/.."

commit=70f1d256acd4b34a572f999a05c87bf00b67730d
model=0a8755f8e2d834eff6a54714ecc7d75f9932e845df35f8b59bc52a7cfe6e8b37
out=build/RNNoise.xcframework
stamp="$out/.built-$commit-$model"
if [ -f "$stamp" ]; then exit 0; fi

work=build/rnnoise
mkdir -p "$work"
if [ ! -d "$work/src/.git" ]; then
  rm -rf "$work/src"
  git clone --quiet https://gitlab.xiph.org/xiph/rnnoise.git "$work/src"
fi
git -C "$work/src" -c advice.detachedHead=false checkout --quiet "$commit"

tarball="$work/rnnoise_data-$model.tar.gz"
if [ ! -f "$tarball" ]; then
  curl --fail --silent --show-error --location -o "$tarball.part" \
    "https://media.xiph.org/rnnoise/models/rnnoise_data-$model.tar.gz"
  mv "$tarball.part" "$tarball"
fi
echo "$model  $tarball" | shasum -a 256 -c --status || {
  echo "build-rnnoise: model checksum mismatch; delete $tarball and retry" >&2
  exit 1
}
tar -xzf "$tarball" -C "$work/src" src/rnnoise_data.c src/rnnoise_data.h

sources="denoise.c rnn.c pitch.c kiss_fft.c celt_lpc.c nnet.c nnet_default.c parse_lpcnet_weights.c rnnoise_tables.c rnnoise_data.c"

# One static library per platform, fat across its architectures.
build_slice() { # name sdk "triple triple..."
  name=$1 sdk=$2 triples=$3
  root=$(xcrun --sdk "$sdk" --show-sdk-path)
  libs=""
  for triple in $triples; do
    objdir="$work/obj/$name/$triple"
    mkdir -p "$objdir"
    for f in $sources; do
      clang -c -O3 -target "$triple" -isysroot "$root" -fvisibility=hidden -DRNNOISE_BUILD \
        -I"$work/src/include" -I"$work/src/src" "$work/src/src/$f" -o "$objdir/${f%.c}.o" &
    done
    wait
    libtool -static -o "$objdir/librnnoise.a" "$objdir"/*.o
    libs="$libs $objdir/librnnoise.a"
  done
  mkdir -p "$work/lib/$name"
  # shellcheck disable=SC2086
  lipo -create $libs -output "$work/lib/$name/librnnoise.a"
}
build_slice macos macosx "arm64-apple-macos14.0 x86_64-apple-macos14.0"
build_slice ios iphoneos "arm64-apple-ios17.0"
build_slice simulator iphonesimulator "arm64-apple-ios17.0-simulator x86_64-apple-ios17.0-simulator"

# Headers in a subdirectory of their own: Xcode copies every static
# xcframework's headers into one include directory, and two module maps at
# its root collide.
headers="$work/headers"
rm -rf "$headers"
mkdir -p "$headers/RNNoise"
cp "$work/src/include/rnnoise.h" "$headers/RNNoise/"
cat >"$headers/RNNoise/module.modulemap" <<'EOF'
module RNNoise {
  header "rnnoise.h"
  link "rnnoise"
  export *
}
EOF

rm -rf "$out"
xcodebuild -create-xcframework \
  -library "$work/lib/macos/librnnoise.a" -headers "$headers" \
  -library "$work/lib/ios/librnnoise.a" -headers "$headers" \
  -library "$work/lib/simulator/librnnoise.a" -headers "$headers" \
  -output "$out" >/dev/null
cp "$work/src/COPYING" "$out/COPYING"
touch "$stamp"
printf 'Built %s/%s\n' "$PWD" "$out"