#!/usr/bin/env bash
# Build the clawhdf5-wasm package the viewer loads, into examples/wasm-viewer/pkg/.
#
# Needs the wasm32-unknown-unknown target and the wasm-bindgen CLI at the
# exact version cargo resolves for the wasm-bindgen crate:
#   rustup target add wasm32-unknown-unknown
#   cargo install wasm-bindgen-cli --version <that version>
#
# Then serve this directory over HTTP (browsers do not load wasm modules from
# file://) and open it:
#   python3 -m http.server -d examples/wasm-viewer 8000
set -euo pipefail

HERE="$(cd "$(dirname "$0")" && pwd)"
ROOT="$(cd "$HERE/../.." && pwd)"
cd "$ROOT"

# The resolved crate version (Cargo.lock is not committed, so ask cargo).
want=$(cargo pkgid wasm-bindgen | sed 's/.*[@#]//')
if ! command -v wasm-bindgen >/dev/null; then
    echo "wasm-bindgen CLI not found: cargo install wasm-bindgen-cli --version $want" >&2
    exit 1
fi
have=$(wasm-bindgen --version | awk '{print $2}')
if [ "$want" != "$have" ]; then
    echo "wasm-bindgen CLI is $have but the crate is $want:" >&2
    echo "  cargo install wasm-bindgen-cli --version $want" >&2
    exit 1
fi

cargo build -p clawhdf5-wasm --target wasm32-unknown-unknown --profile wasm-release

target_dir=$(cargo metadata --format-version 1 --no-deps \
    | sed -n 's/.*"target_directory":"\([^"]*\)".*/\1/p')
wasm="$target_dir/wasm32-unknown-unknown/wasm-release/clawhdf5_wasm.wasm"

rm -rf "$HERE/pkg"
wasm-bindgen --target web --out-dir "$HERE/pkg" "$wasm"
echo "built $HERE/pkg ($(wc -c < "$HERE/pkg/clawhdf5_wasm_bg.wasm") bytes of wasm)"