#!/usr/bin/env bash
# Build pinned static deps for a Linux release into third_party/prefix-linux-ARCH:
# mbedTLS, libcurl (HTTP(S) only, mbedTLS) and wide ncurses.
#   scripts/build_third_party_linux.sh x86_64|x86|aarch64 [all|mbedtls|curl|ncurses]
# Uses LINUX_HOST-gcc from PATH, else fetches it via ci_linux_toolchain.sh.
# Host tools: cmake ninja make perl, and tic/infocmp with the fallback
# terminal entries (Debian: ncurses-bin ncurses-term).
set -euo pipefail
ROOT="$(cd "$(dirname "$0")/.." && pwd)"
ARCH="${1:?usage: $0 x86_64|x86|aarch64 [all|mbedtls|curl|ncurses]}"
TP="$ROOT/third_party"
PREFIX="$TP/prefix-linux-$ARCH"
SRC="$TP/src"
WORK="$TP/build-linux-$ARCH"
JOBS="${JOBS:-$(nproc 2>/dev/null || echo 4)}"

MBEDTLS_VER=3.6.7
MBEDTLS_SHA=a7e8bcbec0e6f761b4af24f25677626b35f762f68eef79c08677a363212d11f6
CURL_VER=8.22.0
CURL_SHA=f7ef3ae8a22e521f289803fe93543eb64c329b58aa73a9e224dfd915a2a5f4f7
NCURSES_VER=6.6
NCURSES_SHA=355b4cbbed880b0381a04c46617b7656e362585d52e9cf84a67e2009b749ff11
# Compiled in, so the TUI starts even where no terminfo database is found.
NCURSES_FALLBACKS=xterm-256color,xterm,screen-256color,tmux-256color,linux,vt100

if [[ -z "${LINUX_HOST:-}" ]] || ! command -v "$LINUX_HOST-gcc" >/dev/null; then
  read -r LINUX_HOST bindir < <(bash "$ROOT/scripts/ci_linux_toolchain.sh" "$ARCH")
  export PATH="$bindir:$PATH"
fi
T="$LINUX_HOST-"
need() { command -v "$1" >/dev/null || { echo "missing: $1" >&2; exit 1; }; }
need "${T}gcc"
need cmake
need ninja
need make
need tic
need infocmp
mkdir -p "$PREFIX" "$SRC" "$WORK"

fetch() { # file sha url...
  local file="$1" sha="$2" u
  shift 2
  if [[ -f "$SRC/$file" ]] && echo "$sha  $SRC/$file" | sha256sum -c --quiet - 2>/dev/null; then
    return 0
  fi
  for u in "$@"; do
    echo "  try $u"
    if curl -fsSL --retry 2 --connect-timeout 15 --max-time 600 -o "$SRC/$file.part" "$u" &&
        echo "$sha  $SRC/$file.part" | sha256sum -c --quiet -; then
      mv "$SRC/$file.part" "$SRC/$file"
      return 0
    fi
  done
  rm -f "$SRC/$file.part"
  echo "download failed: $file" >&2
  exit 1
}

unpack() { # file dir
  rm -rf "${WORK:?}/$2"
  tar -C "$WORK" -xf "$SRC/$1"
}

gh() { # path -> GitHub URL candidates (CN proxies first)
  printf '%s\n' "https://ghfast.top/https://github.com/$1" \
    "https://ghproxy.net/https://github.com/$1" "https://github.com/$1"
}

cmake_cross() { # src build args...
  local s="$1" b="$2"
  shift 2
  cmake -S "$s" -B "$b" -G Ninja \
    -DCMAKE_SYSTEM_NAME=Linux \
    -DCMAKE_C_COMPILER="${T}gcc" -DCMAKE_AR="$(command -v "${T}ar")" \
    -DCMAKE_RANLIB="$(command -v "${T}ranlib")" \
    -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX="$PREFIX" \
    -DCMAKE_INSTALL_LIBDIR=lib -DCMAKE_PREFIX_PATH="$PREFIX" \
    -DCMAKE_FIND_ROOT_PATH="$PREFIX" \
    -DCMAKE_FIND_ROOT_PATH_MODE_PROGRAM=NEVER \
    -DCMAKE_FIND_ROOT_PATH_MODE_LIBRARY=ONLY \
    -DCMAKE_FIND_ROOT_PATH_MODE_INCLUDE=ONLY \
    -DCMAKE_POSITION_INDEPENDENT_CODE=OFF \
    "$@"
  cmake --build "$b" -j"$JOBS"
  cmake --install "$b"
}

build_mbedtls() {
  local f="mbedtls-$MBEDTLS_VER.tar.bz2"
  mapfile -t urls < <(gh "Mbed-TLS/mbedtls/releases/download/mbedtls-$MBEDTLS_VER/$f")
  fetch "$f" "$MBEDTLS_SHA" "${urls[@]}"
  unpack "$f" "mbedtls-$MBEDTLS_VER"
  cmake_cross "$WORK/mbedtls-$MBEDTLS_VER" "$WORK/mbedtls-$MBEDTLS_VER/build" \
    -DENABLE_TESTING=OFF -DENABLE_PROGRAMS=OFF -DGEN_FILES=OFF \
    -DUSE_STATIC_MBEDTLS_LIBRARY=ON -DUSE_SHARED_MBEDTLS_LIBRARY=OFF \
    -DMBEDTLS_FATAL_WARNINGS=OFF
  echo "mbedTLS $MBEDTLS_VER -> $PREFIX"
}

build_curl() {
  local f="curl-$CURL_VER.tar.xz"
  mapfile -t urls < <(gh "curl/curl/releases/download/curl-${CURL_VER//./_}/$f")
  fetch "$f" "$CURL_SHA" "https://curl.se/download/$f" "${urls[@]}"
  unpack "$f" "curl-$CURL_VER"
  # Cross builds skip CA detection; this is only libcurl's default, the
  # program probes the usual distro paths when it is missing.
  cmake_cross "$WORK/curl-$CURL_VER" "$WORK/curl-$CURL_VER/build" \
    -DBUILD_SHARED_LIBS=OFF -DBUILD_STATIC_LIBS=ON \
    -DCURL_USE_MBEDTLS=ON -DCURL_USE_OPENSSL=OFF \
    -DMBEDTLS_INCLUDE_DIR="$PREFIX/include" \
    -DMBEDTLS_LIBRARY="$PREFIX/lib/libmbedtls.a" \
    -DMBEDX509_LIBRARY="$PREFIX/lib/libmbedx509.a" \
    -DMBEDCRYPTO_LIBRARY="$PREFIX/lib/libmbedcrypto.a" \
    -DCURL_CA_BUNDLE=/etc/ssl/certs/ca-certificates.crt -DCURL_CA_PATH=none \
    -DHTTP_ONLY=ON -DCURL_DISABLE_LDAP=ON -DCURL_USE_LIBPSL=OFF \
    -DCURL_USE_LIBSSH2=OFF -DCURL_USE_LIBSSH=OFF -DUSE_LIBIDN2=OFF \
    -DUSE_NGHTTP2=OFF -DCURL_ZLIB=OFF -DCURL_BROTLI=OFF -DCURL_ZSTD=OFF \
    -DCURL_USE_GSSAPI=OFF -DENABLE_THREADED_RESOLVER=ON \
    -DBUILD_CURL_EXE=OFF -DBUILD_TESTING=OFF -DBUILD_EXAMPLES=OFF \
    -DBUILD_LIBCURL_DOCS=OFF -DBUILD_MISC_DOCS=OFF -DENABLE_CURL_MANUAL=OFF
  echo "curl $CURL_VER -> $PREFIX"
}

build_ncurses() {
  local f="ncurses-$NCURSES_VER.tar.gz"
  fetch "$f" "$NCURSES_SHA" \
    "https://invisible-island.net/archives/ncurses/$f" \
    "https://mirrors.tuna.tsinghua.edu.cn/gnu/ncurses/$f" \
    "https://ftp.gnu.org/gnu/ncurses/$f"
  unpack "$f" "ncurses-$NCURSES_VER"
  local b="$WORK/ncurses-$NCURSES_VER/build"
  mkdir -p "$b"
  cd "$b"
  CC="${T}gcc" AR="${T}ar" RANLIB="${T}ranlib" STRIP="${T}strip" \
    ../configure --host="$LINUX_HOST" --prefix="$PREFIX" \
    --without-ada --without-cxx --without-cxx-binding --without-manpages \
    --without-progs --without-tests --without-debug --without-shared \
    --with-normal --enable-widec --disable-db-install \
    --with-default-terminfo-dir=/usr/share/terminfo \
    --with-terminfo-dirs=/etc/terminfo:/lib/terminfo:/usr/share/terminfo:/usr/lib/terminfo \
    --with-fallbacks="$NCURSES_FALLBACKS" \
    --with-tic-path="$(command -v tic)" --with-infocmp-path="$(command -v infocmp)" \
    --enable-pc-files --with-pkg-config-libdir="$PREFIX/lib/pkgconfig" \
    --with-build-cc="${BUILD_CC:-cc}" >/dev/null
  make -j"$JOBS" libs >/dev/null
  make install.libs >/dev/null
  echo "ncurses $NCURSES_VER -> $PREFIX"
}

case "${2:-all}" in
mbedtls) build_mbedtls ;;
curl) build_curl ;;
ncurses) build_ncurses ;;
all)
  build_mbedtls
  build_curl
  build_ncurses
  ;;
*)
  echo "usage: $0 ARCH [all|mbedtls|curl|ncurses]" >&2
  exit 1
  ;;
esac
echo "DONE $ARCH"