#!/usr/bin/env bash
# CI helper: MinGW-w64 UCRT toolchain via llvm-mingw (no Nix / no /nix).
# Downloads a pinned release, puts it on PATH, then runs bootstrap_windows.sh.
set -euo pipefail
ROOT="$(cd "$(dirname "$0")/.." && pwd)"
cd "$ROOT"

VER="${CST_LLVM_MINGW_VER:-20241030}"
NAME="llvm-mingw-${VER}-ucrt-ubuntu-20.04-x86_64"
TGZ="/tmp/${NAME}.tar.xz"
# Prefer /opt when writable (root CI); else unpack under $HOME.
if [[ -w /opt || "$(id -u)" -eq 0 ]]; then
  DIR="/opt/${NAME}"
  PARENT=/opt
else
  DIR="${HOME}/${NAME}"
  PARENT="$HOME"
fi

if [[ ! -x "$DIR/bin/x86_64-w64-mingw32-gcc" ]]; then
  echo "==> download $NAME"
  # Prefer CN-reachable GitHub proxies; raw github.com is often unreachable.
  urls=(
    "https://ghfast.top/https://github.com/mstorsjo/llvm-mingw/releases/download/${VER}/${NAME}.tar.xz"
    "https://ghproxy.net/https://github.com/mstorsjo/llvm-mingw/releases/download/${VER}/${NAME}.tar.xz"
    "https://gitclone.com/github.com/mstorsjo/llvm-mingw/releases/download/${VER}/${NAME}.tar.xz"
    "https://github.com/mstorsjo/llvm-mingw/releases/download/${VER}/${NAME}.tar.xz"
  )
  ok=0
  for u in "${urls[@]}"; do
    echo "  try $u"
    if curl -fL --retry 2 --connect-timeout 15 --max-time 600 \
        --retry-delay 2 -o "$TGZ" "$u"; then
      # Reject tiny error pages that some proxies return with HTTP 200.
      sz=$(wc -c <"$TGZ")
      if [[ "$sz" -gt 10000000 ]]; then
        ok=1
        break
      fi
      echo "  too small ($sz bytes), next mirror"
    fi
  done
  [[ $ok -eq 1 ]] || { echo "failed to download llvm-mingw" >&2; exit 1; }
  rm -rf "$DIR"
  mkdir -p "$PARENT"
  tar -C "$PARENT" -xf "$TGZ"
fi

export PATH="$DIR/bin:$PATH"
export MINGW_HOST=x86_64-w64-mingw32
export BUILD_CC="${BUILD_CC:-cc}"

need() { command -v "$1" >/dev/null || { echo "missing $1" >&2; exit 1; }; }
need x86_64-w64-mingw32-gcc
need x86_64-w64-mingw32-windres
need cmake; need ninja; need perl; need zip; need git; need make

if ! printf '#include <stdio.h>\n' | x86_64-w64-mingw32-gcc -dM -E - | grep -qw _UCRT; then
  echo "toolchain is not UCRT" >&2
  exit 1
fi

# Third-party sources live on GitHub; prefer a CN-friendly rewrite.
git config --global url."https://gitclone.com/github.com/".insteadOf "https://github.com/" || true

echo "==> bootstrap_windows.sh"
exec bash scripts/bootstrap_windows.sh "$ROOT"