#!/usr/bin/env bash
# Rebuild frontend/loudness-wasm.js (base64-embedded WebAssembly loudness core)
# from frontend/wasm/loudness.c. Uses clang (wasm32 + wasm-ld) when present,
# else Zig's bundled clang: `uv pip install ziglang` into a venv and set
# ZIG="<venv>/bin/python -m ziglang" (default: ~/.local/share/ytp-zig).
set -euo pipefail
cd "$(dirname "$0")/.."
tmp=$(mktemp -d); trap 'rm -rf "$tmp"' EXIT
FLAGS=(-O3 -nostdlib -fno-builtin -ffreestanding
  -Wl,--no-entry -Wl,--export=inbuf -Wl,--export=steps -Wl,--export=count -Wl,--export=setup -Wl,--export=feed
  -Wl,--export-memory -Wl,--initial-memory=4325376 -Wl,-z,stack-size=8192 -Wl,--strip-all)
if command -v clang >/dev/null && clang --print-targets 2>/dev/null | grep -q wasm32; then
  clang --target=wasm32 "${FLAGS[@]}" frontend/wasm/loudness.c -o "$tmp/l.wasm"
else
  ZIG=${ZIG:-"$HOME/.local/share/ytp-zig/bin/python -m ziglang"}
  $ZIG cc -target wasm32-freestanding "${FLAGS[@]}" frontend/wasm/loudness.c -o "$tmp/l.wasm"
fi
b64=$(base64 -w0 "$tmp/l.wasm")
cat > frontend/loudness-wasm.js <<JS
/* GENERATED by scripts/build-loudness-wasm.sh from frontend/wasm/loudness.c — do not edit.
 * WebAssembly K-weighting + 100 ms energy steps for EBU R128 loudness (see loudness.js). */
(function (root) {
  root.LOUDNESS_WASM_B64 = '$b64';
  if (typeof module !== 'undefined' && module.exports) module.exports = root.LOUDNESS_WASM_B64;
})(typeof globalThis !== 'undefined' ? globalThis : this);
JS
echo "wasm: $(wc -c < "$tmp/l.wasm") bytes"