#!/usr/bin/env bash
# CI helper: build the pinned TinyCC used for the verification job.
# Distro tcc packages are too old (no <stdatomic.h>), so this builds the same
# mob snapshot nixpkgs ships. Installs to $CST_TCC_PREFIX (default ~/.local/tcc)
# and, under Actions, puts its bin/ on $GITHUB_PATH.
set -euo pipefail

COMMIT="${CST_TCC_COMMIT:-f6385c05308f715bdd2c06336801193a21d69b50}"
PREFIX="${CST_TCC_PREFIX:-$HOME/.local/tcc}"
WORK="${TMPDIR:-/tmp}/tcc-build"

if [[ -x "$PREFIX/bin/tcc" ]]; then
  echo "==> tcc already at $PREFIX"
else
  rm -rf "$WORK"
  mkdir -p "$WORK"
  TGZ="$WORK/tinycc.tar.gz"
  # repo.or.cz is upstream but often unreachable from CN runners; the GitHub
  # mirror carries the same commits.
  urls=(
    "https://ghfast.top/https://github.com/TinyCC/tinycc/archive/${COMMIT}.tar.gz"
    "https://ghproxy.net/https://github.com/TinyCC/tinycc/archive/${COMMIT}.tar.gz"
    "https://github.com/TinyCC/tinycc/archive/${COMMIT}.tar.gz"
    "https://repo.or.cz/tinycc.git/snapshot/${COMMIT}.tar.gz"
  )
  ok=0
  for u in "${urls[@]}"; do
    echo "  try $u"
    if curl -fsSL --retry 2 --connect-timeout 15 --max-time 300 -o "$TGZ" "$u" &&
        tar -tzf "$TGZ" 2>/dev/null | sed -n 1p | grep -q "${COMMIT:0:7}"; then
      ok=1
      break
    fi
  done
  [[ $ok -eq 1 ]] || { echo "failed to download tinycc $COMMIT" >&2; exit 1; }
  tar -C "$WORK" -xzf "$TGZ"
  src=$(find "$WORK" -mindepth 1 -maxdepth 1 -type d -name 'tinycc*' | head -1)
  cd "$src"
  ./configure --prefix="$PREFIX" --cc="${BUILD_CC:-cc}"
  make -j"$(nproc)"
  make install
fi

"$PREFIX/bin/tcc" -v
if [[ -n "${GITHUB_PATH:-}" ]]; then
  echo "$PREFIX/bin" >>"$GITHUB_PATH"
fi