#!/bin/bash
###############################################################################
# BRLTTY - A background process providing access to the console screen (when in
#          text mode) for a blind person using a refreshable braille display.
#
# Copyright (C) 1995-2023 by The BRLTTY Developers.
#
# BRLTTY comes with ABSOLUTELY NO WARRANTY.
#
# This is free software, placed under the terms of the
# GNU Lesser General Public License, as published by the Free Software
# Foundation; either version 2.1 of the License, or (at your option) any
# later version. Please see the file LICENSE-LGPL for details.
#
# Web Page: http://brltty.app/
#
# This software is maintained by Dave Mielke <dave@mielke.cc>.
###############################################################################

. "`dirname "${0}"`/brltty-prologue.sh"

showProgramUsagePurpose() {
cat <<END_OF_PROGRAM_USAGE_PURPOSE
Configure a BRLTTY build for a specific ABI (application binary interface) of the Android platform.
END_OF_PROGRAM_USAGE_PURPOSE
}

showProgramUsageNotes() {
cat <<END_OF_PROGRAM_USAGE_NOTES
This script is used by cfg-android, and is for internal use only.
END_OF_PROGRAM_USAGE_NOTES
}

# Braille drivers already disabled:
# lb (by --without-libbraille)
# xw (by --disable-x)
readonly configureOptions=(
   --disable-expat
   --disable-gpm
   --disable-iconv
   --disable-icu
   --disable-liblouis
   --disable-polkit
   --disable-x

   --without-libbraille
   --with-braille-driver=-ba,-bg,-tt,-vr,al,at,bm,bn,ce,eu,fs,hm,ht,hw,ic,ir,md,mm,mt,np,pg,pm,sk,vo

   --without-espeak
   --without-espeak-ng
   --without-flite
   --without-mikropuhe
   --without-speechd
   --without-swift
   --without-theta
   --with-speech-driver=an,-all

   --with-screen-driver=an,-all

   --without-pgmpath-package
   --without-pgmprivs-package
   --without-service-package
   --without-params-package
   --without-charset-package
   --without-rgx-package
   --without-hostcmd-package
   --without-mntpt-package
   --without-mntfs-package
   --without-bell-package
   --without-leds-package
   --without-beep-package
   --without-midi-package
   --without-fm-package
   --without-hid-package
   --without-ports-package

   --disable-emacs-bindings
   --disable-lua-bindings
)

setProperties() {
   declare -g -A properties
   local ok=true
   local property

   for property in ARCH -CFLAGS -LDFLAGS NDK PLATFORM SOURCE SYSTEM TOOLCHAIN
   do
      local optional=false

      [ "${property:0:1}" != "-" ] || {
         optional=true
         property="${property:1}"
      }

      local variable="BRLTTY_ANDROID_${property}"
      local value="${!variable}"

      "${optional}" || {
         [ -n "${value}" ] || {
            logError "property not set: ${property}"
            ok=false
         }
      }

      properties["${property}"]="${value}"
   done

   "${ok}" || exit 9
}

makeToolChain() {
   [ -d "${properties[TOOLCHAIN]}" ] || {
      logMessage task "installing tool chain for ABI: ${abiName}"

      VERBOSE=no "${properties[NDK]}/build/tools/make-standalone-toolchain.sh" \
         --platform="${properties[PLATFORM]}" \
         --arch="${properties[ARCH]}" \
         --install-dir="${properties[TOOLCHAIN]}" || exit "${?}"
   }
}

linkMissingHeaders() {
   local buildInclude="/usr/include"
   local hostInclude="${properties[TOOLCHAIN]}/sysroot${buildInclude}"
   local header

   for header in bluetooth
   do
      local hostHeader="${hostInclude}/${header}"
      [ ! -e "${hostHeader}" ] || continue

      local buildHeader="${buildInclude}/${header}"
      [ -e "${buildHeader}" ] || continue

      logNote "adding symbolic link for header: ${abiName}: ${header}"
      ln -s "${buildHeader}" "${hostHeader}" || exit "${?}"
   done
}

findTool() {
   local variable="${1}"
   local name="${2}"

   logDetail "finding tool: ${name}"
   local path="${toolsDirectory}/${properties["SYSTEM"]}-${name}"

   [ -f "${path}" ] || {
      logError "tool not found: ${path}"
      exit 8
   }

   logNote "tool found: ${path}"
   setVariable "${variable}" "${path}"
   export "${variable}"
}

addProgramOption f flag forceReconfigure "force a reconfigure"
addProgramParameter ABI abiName "name of ABI to configure" "the source tree"
parseProgramArguments "${@}"
set -e

abiRoot="${programDirectory}/Android/ABI/${abiName}"
abiPropertiesFile="${abiRoot}/build.properties"
[ -f "${abiPropertiesFile}" ] || syntaxError "unrecognized ABI: ${abiName}"
. "${abiPropertiesFile}"
setProperties

makeToolChain
linkMissingHeaders

buildDirectory="$(pwd)"
buildMakeFile="${buildDirectory}/Makefile"

if [ -f "${buildMakeFile}" ]
then
   if "${forceReconfigure}"
   then
      logWarning "reconfiguring build: ${buildDirectory}"
   else
      logNote "build already configured: ${buildDirectory}"
      exit 0
   fi
else
   logMessage task "configuring build: ${buildDirectory}"
fi

toolsDirectory="${properties[TOOLCHAIN]}/bin"
export PATH="${PATH}:${toolsDirectory}"
findTool CC gcc
findTool LD ld
findTool STRIP strip
findTool RANLIB ranlib

sysrootDirectory="${properties[TOOLCHAIN]}/sysroot"
export PKG_CONFIG_SYSROOT_DIR="${sysrootDirectory}"
export PKG_CONFIG_LIBDIR="${sysrootDirectory}/usr/lib/pkgconfig:${sysrootDirectory}/usr/share/pkgconfig"
export PKG_CONFIG_PATH=""

export CFLAGS="${properties[CFLAGS]}"
export LDFLAGS="${properties[LDFLAGS]}"

"${properties[SOURCE]}/configure" --quiet --host="${properties[SYSTEM]}" "${configureOptions[@]}"
exit 0