#!/usr/bin/env bash
# Build third-party deps for Windows MinGW cross + optional Unix busybox.
# Sources:
#   busybox-w32: https://github.com/rmyorston/busybox-w32.git
#   busybox:     https://github.com/mirror/busybox.git
#   curl:        https://github.com/curl/curl.git (Windows via Schannel)
#   PDCurses:    https://github.com/wmcbrine/PDCurses.git
set -euo pipefail
ROOT="$(cd "$(dirname "$0")/.." && pwd)"
TP="$ROOT/third_party"
HOST="${MINGW_HOST:-x86_64-w64-mingw32}"
JOBS="${JOBS:-$(nproc 2>/dev/null || echo 4)}"
mkdir -p "$TP"

need_cmd() { command -v "$1" >/dev/null || { echo "missing: $1" >&2; exit 1; }; }
need_cmd git
need_cmd make
need_cmd "${HOST}-gcc"

clone_or_update() {
  local url="$1" dir="$2"
  if [[ -d "$dir/.git" ]]; then
    git -C "$dir" fetch --depth 1 origin 2>/dev/null || true
    git -C "$dir" pull --ff-only 2>/dev/null || true
  else
    git clone --depth 1 "$url" "$dir"
  fi
}

# --- curl (static, Schannel) ---
build_curl_mingw() {
  clone_or_update https://github.com/curl/curl.git "$TP/curl"
  cd "$TP/curl"
  if [[ ! -f configure ]]; then
    autoreconf -fi 2>/dev/null || true
  fi
  # Prefer cmake for curl modern tree
  rm -rf build-mingw
  cmake -B build-mingw -G "Unix Makefiles" \
    -DCMAKE_SYSTEM_NAME=Windows \
    -DCMAKE_C_COMPILER="${HOST}-gcc" \
    -DCMAKE_RC_COMPILER="${HOST}-windres" \
    -DCMAKE_INSTALL_PREFIX="$TP/prefix-mingw" \
    -DBUILD_SHARED_LIBS=OFF \
    -DCURL_USE_SCHANNEL=ON \
    -DCURL_USE_OPENSSL=OFF \
    -DCURL_DISABLE_LDAP=ON \
    -DCURL_USE_LIBPSL=OFF \
    -DCURL_ZLIB=OFF \
    -DCURL_BROTLI=OFF \
    -DCURL_ZSTD=OFF \
    -DUSE_NGHTTP2=OFF \
    -DBUILD_CURL_EXE=OFF \
    -DBUILD_TESTING=OFF \
    -DHTTP_ONLY=OFF
  cmake --build build-mingw -j"$JOBS"
  cmake --install build-mingw
  echo "curl installed -> $TP/prefix-mingw"
}

# --- PDCurses ---
build_pdcurses_mingw() {
  clone_or_update https://github.com/wmcbrine/PDCurses.git "$TP/PDCurses"
  cd "$TP/PDCurses/wincon"
  make -f Makefile clean 2>/dev/null || true
  make -f Makefile \
    CC="${HOST}-gcc" \
    LINK="${HOST}-gcc" \
    CFLAGS="-O2 -I.. -DPDC_WIDE -DPDC_FORCE_UTF8" \
    LIBEXE="${HOST}-ar" \
    LIBFLAGS=rcv \
    pdcurses.a
  mkdir -p "$TP/prefix-mingw/include" "$TP/prefix-mingw/lib"
  cp -f ../curses.h "$TP/prefix-mingw/include/"
  [[ -f ../panel.h ]] && cp -f ../panel.h "$TP/prefix-mingw/include/" || true
  cp -f pdcurses.a "$TP/prefix-mingw/lib/libpdcurses.a"
  # Also install as curses for find_library
  cp -f pdcurses.a "$TP/prefix-mingw/lib/libcurses.a"
  echo "PDCurses -> $TP/prefix-mingw"
}

# --- busybox-w32 ---
build_busybox_w32() {
  clone_or_update https://github.com/rmyorston/busybox-w32.git "$TP/busybox-w32"
  cd "$TP/busybox-w32"
  # configs: try mingw64 defconfig
  if [[ -f configs/mingw64_defconfig ]]; then
    make mingw64_defconfig
  elif [[ -f configs/mingw_defconfig ]]; then
    make mingw_defconfig
  else
    make defconfig
  fi
  # Cross compile
  make -j"$JOBS" CROSS_COMPILE="${HOST}-" \
    CONFIG_EXTRA_CFLAGS="-O2" \
    busybox.exe 2>&1 || make -j"$JOBS" CROSS_COMPILE="${HOST}-"
  mkdir -p "$TP/busybox"
  if [[ -f busybox.exe ]]; then
    cp -f busybox.exe "$TP/busybox/busybox.exe"
  else
    find . -name 'busybox.exe' | head -1 | xargs -I{} cp -f {} "$TP/busybox/busybox.exe"
  fi
  cat > "$TP/busybox/LICENSE.busybox" << 'EOF'
BusyBox is GPLv2. Source: https://github.com/rmyorston/busybox-w32
Upstream BusyBox: https://github.com/mirror/busybox
EOF
  ls -la "$TP/busybox/busybox.exe"
}

# --- Unix busybox (optional, for Linux/Termux side-by-side bundle) ---
build_busybox_unix() {
  clone_or_update https://github.com/mirror/busybox.git "$TP/busybox-src"
  cd "$TP/busybox-src"
  make defconfig
  # Keep applets reasonable; enable ash + diff
  make -j"$JOBS" busybox
  mkdir -p "$TP/busybox"
  cp -f busybox "$TP/busybox/busybox"
  echo "unix busybox -> $TP/busybox/busybox"
}

TARGETS="${1:-all}"
case "$TARGETS" in
  curl) build_curl_mingw ;;
  pdcurses) build_pdcurses_mingw ;;
  busybox-w32) build_busybox_w32 ;;
  busybox-unix) build_busybox_unix ;;
  all)
    build_curl_mingw
    build_pdcurses_mingw
    build_busybox_w32
    ;;
  *)
    echo "usage: $0 [all|curl|pdcurses|busybox-w32|busybox-unix]"
    exit 1
    ;;
esac
echo "DONE"