#!/usr/bin/env bash
# Build wai-quantum-serve as a PURE `wasi:http/proxy` component.
#
# Why this exists: a plain `--target wasm32-wasip2` build imports
# `wasi:cli/environment` (Rust's std pulls it in at startup), which the bare
# proxy world does not provide — so it only runs with `wasmtime serve -S cli=y`.
# Building a wasip1 core module and adapting it with the Bytecode Alliance's
# proxy adapter produces a component whose imports all sit inside the proxy
# world, so it runs on ANY wasi:http host with no host flags.
set -euo pipefail

# Keep this in step with the wasmtime you serve with: the adapter is tied to a
# WASI version, and a mismatch shows up as an unresolved-import error.
WASMTIME_VERSION="${WASMTIME_VERSION:-v48.0.1}"
CACHE="${WASI_ADAPTER_CACHE:-$HOME/.cache/wasi-adapters}"
ADAPTER="$CACHE/wasi_snapshot_preview1.proxy.$WASMTIME_VERSION.wasm"
OUT="${1:-target/wai_quantum_serve.proxy.wasm}"

command -v wasm-tools >/dev/null || { echo "need wasm-tools (cargo install wasm-tools)" >&2; exit 1; }
rustup target list --installed | grep -qx wasm32-wasip1 || rustup target add wasm32-wasip1

if [ ! -f "$ADAPTER" ]; then
  mkdir -p "$CACHE"
  url="https://github.com/bytecodealliance/wasmtime/releases/download/$WASMTIME_VERSION/wasi_snapshot_preview1.proxy.wasm"
  echo "fetching proxy adapter $WASMTIME_VERSION"
  node -e '
    const fs=require("fs");
    (async()=>{const r=await fetch(process.argv[1],{redirect:"follow"});
     if(!r.ok){console.error("download failed",r.status);process.exit(1);}
     fs.writeFileSync(process.argv[2],Buffer.from(await r.arrayBuffer()));})();
  ' "$url" "$ADAPTER"
fi

cargo build --release --target wasm32-wasip1
wasm-tools component new target/wasm32-wasip1/release/wai_quantum_serve.wasm \
  --adapt "wasi_snapshot_preview1=$ADAPTER" -o "$OUT"

# Fail loudly if anything outside the proxy world crept back in.
if wasm-tools component wit "$OUT" | grep -q "wasi:cli/environment"; then
  echo "ERROR: component still imports wasi:cli/environment — not a proxy-world component" >&2
  exit 1
fi

echo "built $OUT"
echo "run:  wasmtime serve --addr 127.0.0.1:8080 $OUT      # no -S flags needed"