#!/usr/bin/env bash
# Build pinned third-party deps for Windows x86_64 (mingw-w64, UCRT) into
# third_party/prefix-mingw, plus busybox-w32 into third_party/busybox.
#   nix-shell shell-win.nix --run 'scripts/build_third_party_mingw.sh [all|curl|pdcurses|ncurses|busybox-w32]'
# Works the same from an MSYS2 UCRT64 shell (MINGW_HOST= uses unprefixed tools).
set -euo pipefail
ROOT="$(cd "$(dirname "$0")/.." && pwd)"
TP="$ROOT/third_party"
PREFIX="$TP/prefix-mingw"
HOST="${MINGW_HOST-x86_64-w64-mingw32}"
T="${HOST:+$HOST-}"
JOBS="${JOBS:-$(nproc 2>/dev/null || echo 4)}"

CURL_TAG=curl-8_22_0
PDCURSES_TAG=3.9
NCURSES_VER=6.6
BUSYBOX_W32_REV=9b50a1e

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

checkout() { # url dir rev
  local url="$1" dir="$2" rev="$3"
  [[ -d "$dir/.git" ]] || git clone -q --filter=blob:none "$url" "$dir"
  if ! git -C "$dir" rev-parse -q --verify "$rev^{commit}" >/dev/null; then
    git -C "$dir" fetch -q --tags origin
  fi
  git -C "$dir" checkout -q --detach "$rev"
}

build_curl() {
  checkout https://github.com/curl/curl.git "$TP/curl" "$CURL_TAG"
  rm -rf "$TP/curl/build-mingw"
  local tc=()
  [[ -n "$HOST" ]] && tc=(-DCMAKE_SYSTEM_NAME=Windows -DCMAKE_C_COMPILER="${T}gcc" -DCMAKE_RC_COMPILER="${T}windres")
  cmake -S "$TP/curl" -B "$TP/curl/build-mingw" -G Ninja "${tc[@]}" \
    -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_INSTALL_PREFIX="$PREFIX" \
    -DBUILD_SHARED_LIBS=OFF -DBUILD_STATIC_LIBS=ON \
    -DCURL_USE_SCHANNEL=ON -DCURL_USE_OPENSSL=OFF \
    -DCURL_WINDOWS_SSPI=ON -DENABLE_UNICODE=ON \
    -DCURL_DISABLE_LDAP=ON -DCURL_USE_LIBPSL=OFF -DCURL_USE_LIBSSH2=OFF \
    -DUSE_LIBIDN2=OFF -DUSE_NGHTTP2=OFF \
    -DCURL_ZLIB=OFF -DCURL_BROTLI=OFF -DCURL_ZSTD=OFF \
    -DBUILD_CURL_EXE=OFF -DBUILD_TESTING=OFF -DBUILD_EXAMPLES=OFF \
    -DBUILD_LIBCURL_DOCS=OFF -DBUILD_MISC_DOCS=OFF -DENABLE_CURL_MANUAL=OFF
  cmake --build "$TP/curl/build-mingw" -j"$JOBS"
  cmake --install "$TP/curl/build-mingw"
  echo "curl $CURL_TAG -> $PREFIX"
}

build_pdcurses() {
  checkout https://github.com/wmcbrine/PDCurses.git "$TP/PDCurses" "$PDCURSES_TAG"
  cd "$TP/PDCurses/wincon"
  make clean >/dev/null 2>&1 || true
  make -j"$JOBS" CC="${T}gcc" AR="${T}ar" STRIP="${T}strip" WIDE=Y UTF8=Y pdcurses.a
  mkdir -p "$PREFIX/include/pdcurses" "$PREFIX/lib"
  cp -f ../curses.h ../panel.h "$PREFIX/include/pdcurses/"
  cp -f pdcurses.a "$PREFIX/lib/libpdcurses.a"
  echo "PDCurses $PDCURSES_TAG -> $PREFIX"
}

build_ncurses() {
  local src="$TP/ncurses-$NCURSES_VER" tgz="$TP/ncurses-$NCURSES_VER.tar.gz"
  [[ -f "$tgz" ]] || curl -fL -o "$tgz" \
    "https://invisible-island.net/archives/ncurses/ncurses-$NCURSES_VER.tar.gz"
  [[ -d "$src" ]] || tar -C "$TP" -xzf "$tgz"
  local pf
  for pf in "$ROOT"/scripts/patches/ncurses-"$NCURSES_VER"-*.patch; do
    [[ -e "$pf" ]] || continue
    patch -d "$src" -p1 -R --dry-run -s -f <"$pf" >/dev/null 2>&1 && continue
    if ! patch -d "$src" -p1 --dry-run -s -f <"$pf" >/dev/null 2>&1; then
      echo "ncurses: $src has another version of $(basename "$pf"); re-extracting"
      rm -rf "$src"
      tar -C "$TP" -xzf "$tgz"
    fi
    patch -d "$src" -p1 -s <"$pf"
  done
  rm -rf "$src/build-mingw"
  mkdir -p "$src/build-mingw"
  cd "$src/build-mingw"
  ../configure --host="${HOST:-x86_64-w64-mingw32}" --prefix="$PREFIX" \
    --without-ada --without-cxx --without-cxx-binding --without-manpages \
    --without-progs --without-tests --without-debug --without-shared \
    --enable-widec --enable-sp-funcs --enable-term-driver \
    --enable-interop --disable-home-terminfo --disable-db-install \
    --with-fallbacks=ms-terminal,xterm-256color --without-pkg-config \
    --disable-pc-files --with-build-cc="${BUILD_CC:-cc}" >/dev/null
  make -j"$JOBS" libs >/dev/null
  make install.libs >/dev/null
  echo "ncurses $NCURSES_VER -> $PREFIX"
}

build_busybox_w32() {
  checkout https://github.com/rmyorston/busybox-w32.git "$TP/busybox-w32" "$BUSYBOX_W32_REV"
  cd "$TP/busybox-w32"
  make -s mingw64u_defconfig >/dev/null
  make -s -j"$JOBS" CROSS_COMPILE="$T" </dev/null
  mkdir -p "$TP/busybox"
  cp -f busybox.exe "$TP/busybox/busybox.exe"
  cat >"$TP/busybox/LICENSE.busybox" <<EOF
BusyBox is GPLv2. This busybox.exe is busybox-w32 ($BUSYBOX_W32_REV, Unicode build):
https://github.com/rmyorston/busybox-w32
Upstream BusyBox: https://busybox.net/
EOF
  ls -la "$TP/busybox/busybox.exe"
}

case "${1:-all}" in
curl) build_curl ;;
pdcurses) build_pdcurses ;;
ncurses) build_ncurses ;;
busybox-w32) build_busybox_w32 ;;
all)
  build_curl
  build_ncurses
  build_busybox_w32
  ;;
*)
  echo "usage: $0 [all|curl|pdcurses|ncurses|busybox-w32]"
  exit 1
  ;;
esac
echo "DONE"