#! /bin/bash

#
#  Basic configuration
#

declare -A conf

# Behavior
conf[GINT_STARTUP_LOG]=
conf[GINT_NO_SYSCALLS]=
conf[GINT_EXTENDED_LIBC]=
conf[GINT_STATIC_GRAY]=

# Size limits
conf[ATEXIT_MAX]=16
conf[TIMER_SLOTS]=16
conf[EVENTS_QUEUE_SIZE]=64

# Output files
output_gcc="gcc.cfg"
output_make="Makefile.cfg"

#
#  Help screen and output util
#

error="\e[31;1merror:\e[0m"
Cg="$(tput setaf 8)$(tput bold)"
Cr="$(tput setaf 1)$(tput bold)"
Cy="$(tput setaf 2)$(tput bold)"
Cp="$(tput setaf 5)$(tput setaf 62)$(tput bold)"
C0="$(tput setaf 0)$(tput sgr 0)"

help()
{
	cat << EOF
Configuration script for the gint library.

Options that affect the behavior of the library:
  $Cr--startup-log $Cg[default:$Cp false$Cg]$C0
    Enable a on-screen log at startup if a key is kept pressed while launching
    the add-in, allowing easy debug and crash diagnoses.
  $Cr--no-syscalls $Cg[default:$Cp false$Cg]$C0
    Never use syscalls. Expect trouble with malloc() and the gray engine. Do
    not trigger this switch unless you know what you are doing.
  $Cr--extended-libc $Cg[default:$Cp false$Cg]$C0
    Enable specific C99 headers/features that are normally not required by
    calculator programs. This may allow porting programs from other platforms.
  $Cr--static-gray-engine $Cg[default:$Cp false$Cg]$C0
    Place the gray engine vram in static ram instead of using the heap. Always
    use this option when using both the gray engine and --no-syscalls.

Options that customize size limits:
  $Cr--atexit-max=$Cy<integer>$Cg [default:$Cp 16$Cg]$C0
    Number of exit handlers that can be registered by atexit().
  $Cr--timer-slots=$Cy<integer>$Cg [default:$Cp 16$Cg]$C0
    Number of virtual timers that may be registered at the same time.
  $Cr--events-queue-size=$Cy<integer>$Cg [default:$Cp 64$Cg]$C0
    Number of events simultaneously stored in the event queue.
EOF

	exit 0
}

#
#  Parsing arguments
#

fail=false
for arg; do case "$arg" in
	-h | --help) help;;
	--startup-log)		conf[GINT_STARTUP_LOG]=true;;
	--no-syscalls)		conf[GINT_NO_SYSCALLS]=true;;
	--extended-libc)	conf[GINT_EXTENDED_LIBC]=true;;
	--static-gray-engine)	conf[GINT_STATIC_GRAY]=true;;

	--atexit-max=*)
		size=${arg#*=}
		if [[ $size == +([0-9]) ]]; then
			conf[ATEXIT_MAX]=$size
		else echo -e "$error --atexit-max expects an integer value"
			fail=true; fi;;
	--timer-slots=*)
		size=${arg#*=}
		if [[ $size == +([0-9]) ]]; then
			conf[TIMER_SLOTS]=$size
		else echo -e "$error --timer-slots expects an integer value"
			fail=true; fi;;
	--events-queue-size=*)
		size=${arg#*=}
		if [[ $size == +([0-9]) ]]; then
			conf[EVENTS_QUEUE_SIZE]=$size
		else echo -e "$error --events-queue-size expects an integer"\
			"value"
			fail=true; fi;;

	--atexit-max | --timer-slots | --events-queue-size)
		echo -e "$error syntax for $arg is $arg=<integer-value>";;

	*)
		echo -e "$error unrecognized argument '$arg'"; fail=true;;
esac; done

#
#  Output config routines
#

output_config_gcc()
{
	[ "${conf[GINT_STARTUP_LOG]}"   != "" ] && echo "-D GINT_STARTUP_LOG"
	[ "${conf[GINT_NO_SYSCALLS]}"   != "" ] && echo "-D GINT_NO_SYSCALLS"
	[ "${conf[GINT_EXTENDED_LIBC]}" != "" ] && echo "-D GINT_EXTENDED_LIBC"
	[ "${conf[GINT_STATIC_GRAY]}"   != "" ] && echo "-D GINT_STATIC_GRAY"

	echo "-D ATEXIT_MAX=${conf[ATEXIT_MAX]}"
	echo "-D TIMER_SLOTS=${conf[TIMER_SLOTS]}"
	echo "-D EVENTS_QUEUE_SIZE=${conf[EVENTS_QUEUE_SIZE]}"
}

output_config_make()
{
	[ "${conf[GINT_EXTENDED_LIBC]}" != "" ] && echo "config_ext=true"
}

#
#  Output config
#

if $fail; then
	echo "Configuration has not been modified."
else
	output_config_gcc > $output_gcc
	output_config_make > $output_make
	echo "Configuration saved in $output_gcc and $output_make."
fi