#!/usr/bin/env bash
# Anticonf script by Jeroen Ooms (2020)
# The script will try 'mariadb_config' and 'mysql_config' to find required
# cflags and ldflags. Make sure this executable is in PATH when installing
# the package. Alternatively, you can set INCLUDE_DIR and LIB_DIR manually:
# R CMD INSTALL --configure-vars='INCLUDE_DIR=/.../include LIB_DIR=/.../lib'

# Library settings
PKG_DEB_NAME="libmariadbclient-dev | libmariadb-client-lgpl-dev"
PKG_RPM_NAME="mariadb-connector-c-devel | mariadb-devel | mysql-devel"
PKG_CSW_NAME="mysql56_dev"
PKG_BREW_NAME="mariadb-connector-c"
PKG_TEST_HEADER="<mysql.h>"
PKG_LIBS="-lmysqlclient"

# Use mysql_config (on Solaris /opt/csw/bin must be in PATH)
if [ $(command -v mariadb_config) ]; then
  PKGCONFIG_CFLAGS=$(mariadb_config --cflags)
  PKGCONFIG_LIBS=$(mariadb_config --libs)
elif [ $(command -v mysql_config) ]; then
  PKGCONFIG_CFLAGS=$(mysql_config --cflags)
  PKGCONFIG_LIBS=$(mysql_config --libs)
fi

# Note that cflags may be empty in case of success
if [ "$INCLUDE_DIR" ] || [ "$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" ] || [ "$PKGCONFIG_LIBS" ]; then
  echo "Found mysql_config cflags and libs!"
  PKG_CFLAGS=${PKGCONFIG_CFLAGS}
  PKG_LIBS=${PKGCONFIG_LIBS}
  # Workaround for homebrew linkin bug
  if [[ "$OSTYPE" == "darwin"* ]]; then
    PKG_LIBS="-L/usr/local/opt/openssl/lib $PKG_LIBS"
  fi
elif [[ "$OSTYPE" == "darwin"* ]]; then
  if [ $(command -v brew) ]; then
    BREWDIR=$(brew --prefix)
  else
    curl -sfL "https://jeroen.github.io/autobrew/$PKG_BREW_NAME" > autobrew
    source autobrew
  fi
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 "Configure could not find suitable mysql/mariadb client library. Try installing:"
  echo " * deb: $PKG_DEB_NAME (Debian, Ubuntu)"
  echo " * rpm: $PKG_RPM_NAME (Fedora, CentOS, RHEL)"
  echo " * csw: $PKG_CSW_NAME (Solaris)"
  echo " * brew: $PKG_BREW_NAME (OSX)"
  echo "If you already have a mysql client library installed, verify that either"
  echo "mariadb_config or mysql_config is on your PATH. If these are unavailable"
  echo "you can also 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

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

# Success
exit 0