#! /bin/sh

MAX_MEMORY_TESTS="67108864"

unset LDFLAGS
unset CFLAGS

if command -v wasm-opt >/dev/null; then
  wasm-opt -O4 -o "${1}.tmp" "$1" && mv -f "${1}.tmp" "$1"
fi

if [ -z "$WASI_RUNTIME" ] || [ "$WASI_RUNTIME" = "wavm" ]; then
  if command -v wavm >/dev/null; then
    wavm run --abi=wasi "$1" && exit 0
  fi
fi

if [ -z "$WASI_RUNTIME" ] || [ "$WASI_RUNTIME" = "wasmtime" ]; then
  if command -v wasmtime >/dev/null; then
    wasmtime run --dir=. "$1" && exit 0
  fi
fi

if [ -z "$WASI_RUNTIME" ] || [ "$WASI_RUNTIME" = "wasmer" ]; then
  if command -v wasmer >/dev/null; then
    wasmer run "$1" "--${WASMER_BACKEND:-cranelift}" --dir=. && exit 0
  fi
fi

if [ -z "$WASI_RUNTIME" ] || [ "$WASI_RUNTIME" = "wasm3" ]; then
  if command -v wasm3 >/dev/null; then
    wasm3 "$1" && exit 0
  fi
fi

if [ -z "$WASI_RUNTIME" ] || [ "$WASI_RUNTIME" = "iwasm" ]; then
  if iwasm | grep -qi wasi >/dev/null 2>&1; then
    iwasm "$1" && exit 0
  fi
fi

if [ -z "$WASI_RUNTIME" ] || [ "$WASI_RUNTIME" = "ssvm" ]; then
  if command -v ssvmc >/dev/null && command -v ssvm >/dev/null; then
    ssvmc "$1" "${1}.so" &&
      ssvm --dir=.:. "${1}.so" &&
      rm -f "${1}.so"
  fi
fi

if [ -z "$WASI_RUNTIME" ] || [ "$WASI_RUNTIME" = "node" ]; then
  if echo | node --experimental-wasi-unstable-preview1 >/dev/null 2>&1; then
    {
      echo "import fs from 'fs'; import { WASI } from 'wasi';"
      echo "const wasi = new WASI({args: process.argv, env: process.env, preopens: {'.':'.'}});"
      echo "const importObject = { wasi_snapshot_preview1: wasi.wasiImport };"
      echo "const wasm = await WebAssembly.compile(fs.readFileSync('${1}'));"
      echo "const instance = await WebAssembly.instantiate(wasm, importObject);"
      echo "wasi.start(instance);"
    } >"${1}.mjs"
    cat "${1}.mjs" >/tmp/a
    node --experimental-wasi-unstable-preview1 "${1}.mjs" 2>/tmp/err &&
      rm -f "${1}.mjs" && exit 0
  fi
fi

if [ -z "$WASI_RUNTIME" ] || [ "$WASI_RUNTIME" = "wasmer-js" ]; then
  if command -v wasmer-js >/dev/null; then
    wasmer-js run "$1" --dir=. && exit 0
  fi
fi

if [ -z "$WASI_RUNTIME" ] || [ "$WASI_RUNTIME" = "lucet" ]; then
  if command -v lucetc-wasi >/dev/null && command -v lucet-wasi >/dev/null; then
    lucetc-wasi \
      --target-cpu native \
      --reserved-size "4GiB" \
      --opt-level speed \
      "$1" -o "${1}.so" &&
      lucet-wasi --dir=.:. --max-heap-size "${MAX_MEMORY_TESTS}" "${1}.so" &&
      rm -f "${1}.so" && exit 0
  fi
fi

echo "WebAssembly runtime failed" >&2
exit 1