#!/usr/bin/env bash
# Usage: scripts/typecheck-js.sh
# Type-checks the JavaScript track with TypeScript, using js/jsconfig.json and the types in js/src/types.d.ts.
# Two runs, both must be clean:
#   1. the untouched stubs in js/src (a student's starting point must not show errors in the editor);
#   2. a temp copy of the repo whose js/src holds the solutions.
# Nothing is installed in the repo: TypeScript comes from `npx -y -p typescript tsc`, which needs the network the
# first time (npm caches it afterwards). Set TS_PACKAGE to pin a version, e.g. TS_PACKAGE=typescript@5.9.
# Exit: 0 clean, 1 type errors, 2 TypeScript could not be run (no npx, no network).
set -uo pipefail
repo="$(cd "$(dirname "$0")/.." && pwd)"
pkg="${TS_PACKAGE:-typescript}"

if ! command -v npx >/dev/null 2>&1; then
  echo "typecheck-js: npx not found (it comes with Node.js); cannot run TypeScript" >&2; exit 2
fi
if ! version="$(npx -y -p "$pkg" tsc --version 2>&1)"; then
  echo "typecheck-js: could not run 'npx -y -p $pkg tsc' (no network, or npm cannot reach its registry)." >&2
  echo "$version" | tail -5 >&2
  echo "typecheck-js: nothing was checked." >&2
  exit 2
fi
version="$(grep -o 'Version .*' <<<"$version")"

tmp="$(mktemp -d)"
trap 'rm -rf "$tmp"' EXIT
tar -C "$repo" --exclude=.git --exclude=node_modules --exclude=bin --exclude=obj \
    --exclude=.scala-build --exclude=.bsp --exclude=.superpowers -cf - js | tar -C "$tmp" -xf -
mkdir -p "$tmp/stubs" "$tmp/solved"
cp -r "$tmp/js" "$tmp/stubs/js"
mv "$tmp/js" "$tmp/solved/js"
rm -rf "$tmp/solved/js/src"
cp -r "$tmp/solved/js/solutions" "$tmp/solved/js/src"

status=0
for which in stubs solved; do
  label="$([ "$which" = stubs ] && echo "js/src (stubs)" || echo "js/solutions as src")"
  if out="$(cd "$tmp/$which" && npx -y -p "$pkg" tsc -p js/jsconfig.json 2>&1)"; then
    echo "$label: ok ($version)"
  else
    echo "$label: FAIL"
    grep -v '^npm notice' <<<"$out"
    status=1
  fi
done
exit $status