#!/bin/sh
# Anticonf (tm) script by Jeroen Ooms (2025)
# This script will query 'pkg-config' for the required cflags and ldflags.
# If pkg-config is unavailable or does not find the library, try setting
# INCLUDE_DIR and LIB_DIR manually via e.g:
# R CMD INSTALL --configure-vars='INCLUDE_DIR=/.../include LIB_DIR=/.../lib'

# Library settings
PKG_CONFIG_NAME="libcurl"
PKG_DEB_NAME="libcurl4-openssl-dev"
PKG_RPM_NAME="libcurl-devel"
PKG_APK_NAME="curl-dev"
PKG_TEST_HEADER="<curl/curl.h>"
PKG_LIBS="-lcurl"
PKG_CFLAGS=""

#export PKG_CONFIG_PATH="/opt/homebrew/opt/curl/lib/pkgconfig"

# (Jan 2025) MacOS ships a very buggy libcurl 8.7.1 so we avoid this until apple updates it
# See: https://github.com/jeroen/curl/issues/376
if [ `uname` = "Darwin" ]; then
MINVERSION="--atleast-version=8.8.0"
fi

# Use pkg-config if available
pkg-config ${PKG_CONFIG_NAME} ${MINVERSION} 2>/dev/null
if [ $? -eq 0 ]; then
  PKGCONFIG_CFLAGS=`pkg-config --cflags ${PKG_CONFIG_NAME}`
  case "$PKGCONFIG_CFLAGS" in
    *CURL_STATICLIB*) PKGCONFIG_LIBS=`pkg-config --libs --static ${PKG_CONFIG_NAME}`;;
    *) PKGCONFIG_LIBS=`pkg-config --libs ${PKG_CONFIG_NAME}`;;
  esac
fi

# Note that cflags may be empty in case of success
if [ "$CURL_CFLAGS" ] || [ "$CURL_LIBS" ]; then
  echo "Found CURL_CFLAGS and/or CURL_LIBS!"
  PKG_CFLAGS="$CURL_CFLAGS"
  PKG_LIBS="$CURL_LIBS"
elif [ "$INCLUDE_DIR" ] || [ "$LIB_DIR" ]; then
  echo "Found INCLUDE_DIR and/or LIB_DIR!"
  PKG_CFLAGS="-I$INCLUDE_DIR $PKG_CFLAGS"
  PKG_LIBS="-L$LIB_DIR $PKG_LIBS"
elif [ "$PKGCONFIG_CFLAGS" ] || [ "$PKGCONFIG_LIBS" ]; then
  echo "Found pkg-config cflags and libs!"
  PKG_CFLAGS=${PKGCONFIG_CFLAGS}
  PKG_LIBS=${PKGCONFIG_LIBS}
elif [ `uname` = "Darwin" ]; then
  # Temporary fix for: https://github.com/jeroen/curl/issues/376
  curl -sfL "https://autobrew.github.io/scripts/libcurl-macos" > autobrew
  . ./autobrew
fi

# Find compiler
CC=`${R_HOME}/bin/R CMD config CC`
CFLAGS=`${R_HOME}/bin/R CMD config CFLAGS`
CPPFLAGS=`${R_HOME}/bin/R CMD config CPPFLAGS`

# For debugging
echo "Using PKG_CFLAGS=$PKG_CFLAGS"
echo "Using PKG_LIBS=$PKG_LIBS"

# Test configuration
echo "#include $PKG_TEST_HEADER" | ${CC} ${CPPFLAGS} ${PKG_CFLAGS} ${CFLAGS} -E -xc - >/dev/null 2>configure.log

# Customize the error
if [ $? -ne 0 ]; then
  echo "--------------------------- [ANTICONF] --------------------------------"
  echo "Configuration failed because $PKG_CONFIG_NAME was not found. Try installing:"
  echo " * deb: $PKG_DEB_NAME (Debian, Ubuntu, etc)"
  echo " * rpm: $PKG_RPM_NAME (Fedora, CentOS, RHEL)"
  echo " * apk: $PKG_APK_NAME (Alpine)"
  echo "If $PKG_CONFIG_NAME is already installed, check that 'pkg-config' is in your"
  echo "PATH and PKG_CONFIG_PATH contains a $PKG_CONFIG_NAME.pc file. If pkg-config"
  echo "is unavailable you can set INCLUDE_DIR and LIB_DIR manually via:"
  echo "R CMD INSTALL --configure-vars='INCLUDE_DIR=... LIB_DIR=...'"
  echo "-------------------------- [ERROR MESSAGE] ---------------------------"
  cat configure.log
  echo "--------------------------------------------------------------------"
  exit 1
fi

# Test minimum version
${CC} -E ${CPPFLAGS} ${PKG_CFLAGS} ${CFLAGS} tools/version.c >/dev/null 2>&1
if [ $? -ne 0 ]; then

# On curl < 7.73 (RHEL-8 / Ubuntu 20.04) enable the static library
if [ `uname` = "Linux" ]; then
  echo "Local libcurl is too old. Downloading a static libcurl for legacy Linux..."
  echo "For alternative solutions see: https://github.com/jeroen/curl/issues/416"
  curl -sOL "https://github.com/jeroen/curl/releases/download/libcurl-8.14.1/get-curl-linux.sh" && . ./get-curl-linux.sh
fi

# MacOS 13 CRAN builder has MacOS 11.3 SDK
# Also for people compiling from source on MacOS 11
if [ `uname` = "Darwin" ] && [ -z "$BREWDIR" ] && ${R_HOME}/bin/Rscript --vanilla tools/testversion.R "7.80"; then
  PKG_CFLAGS="$PKG_CFLAGS -DENABLE_MACOS_POLYFILL"
fi
fi

# Write to Makevars
sed -e "s|@cflags@|$PKG_CFLAGS|" -e "s|@libs@|$PKG_LIBS|" src/Makevars.in > src/Makevars

# Success
exit 0
