#!/usr/bin/env bash
# Copyright 2026 @quantus/crypto authors & contributors
# SPDX-License-Identifier: Apache-2.0

# Builds packages/quantus-crypto. Deliberately NOT part of build-wasm.sh: that
# script drives the nightly-2022-06-24 + xargo build that `wasm-crypto` needs,
# and this crate needs a modern compiler (inline `const {}` blocks, Rust >= 1.79).
# Keeping the two builds separate is what lets wasm-crypto stay byte-identical to
# upstream. See quantus/wasm#1.
#
# There is no asm.js step here. wasm2js over ML-DSA would be enormous and slow,
# and every context we ship into sets 'wasm-unsafe-eval', so wasm is always
# available where this runs.

set -e

# Which package to build. Two now — quantus-crypto and quantus-codec — built
# the same way from the same toolchain, so the script takes the name rather than
# being copied. `quantus_codec` is the crate name for `quantus-codec`: cargo
# wants underscores, npm wants hyphens.
PKG=${1:-quantus-crypto}
CRATE=$(echo "$PKG" | tr '-' '_')
BINDGEN_VER=0.2.128

WASM=packages/$PKG/build-wasm/${CRATE}_bg.wasm
OPT=packages/$PKG/build-wasm/${CRATE}_opt.wasm

echo "*** Building Rust sources"
# The toolchain comes from packages/quantus-crypto/rust-toolchain.toml, which
# pins the same channel the chain builds its runtime with.
(cd packages/$PKG && cargo build --target wasm32-unknown-unknown --release --locked)

echo "*** Converting to WASM"
./bindgen-quantus/wasm-bindgen \
  packages/$PKG/target/wasm32-unknown-unknown/release/$CRATE.wasm \
  --out-dir packages/$PKG/build-wasm \
  --target web

# The glue is a build artifact but is checked in, so the package can be built
# without a Rust toolchain — the same reasoning as upstream checking in an empty
# bytes.js. Copy it back so the two never drift.
# Must run before the glue is copied into src/generated — see the script's own
# comment for why the fetch path cannot ship.
node ./scripts/strip-wasm-fetch-init.mjs packages/$PKG/build-wasm/$CRATE.js

echo "*** Updating checked-in bindings"
cp packages/$PKG/build-wasm/$CRATE.js packages/$PKG/src/generated/$CRATE.js
cp packages/$PKG/build-wasm/$CRATE.d.ts packages/$PKG/src/generated/$CRATE.d.ts

# binaryen-quantus, not binaryen. Upstream pins version_105 (2021), which predates
# the externref tables wasm-bindgen 0.2.128 emits: it "optimises" the table into
# something that fails at instantiation with
# `WebAssembly.Table.grow(): failed to grow table by 4`. The wasm is valid before
# wasm-opt and broken after, and nothing in the build says so — it only surfaces
# when a consumer tries to init. Same shape of problem as the two bindgens.
echo "*** Optimising WASM output"
./binaryen-quantus/bin/wasm-opt $WASM -Oz -o $OPT

# Must come before packing: tsc clears build/, which is where bytes.js lands.
./scripts/build-quantus-js.sh "$PKG"

echo "*** Packing WASM into baseX"
PKG_NAME=$PKG CRATE_NAME=$CRATE node ./scripts/pack-quantus-base.mjs