#! /bin/bash

#
#  Basic configuration
#

declare -A conf

# Target platform
conf_target=

# Behavior
conf[GINT_BOOT_LOG]=
conf[GINT_NO_SYSCALLS]=
cong[GINT_LAX]=
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="config/Makefile.cfg"

#
#  Help screen and output util
#

error="\e[31;1merror:\e[0m"
C_="$(echo -e '\e[30;1m')"
Cr="$(echo -e '\e[31;1m')"
Cg="$(echo -e '\e[32;1m')"
Cp="$(echo -e '\e[34;1m')"
C0="$(echo -e '\e[0m')"

help()
{
	cat << EOF
Configuration script for the gint library.
Usage: $0 [options...]

Platform settings (specify exactly one):
  ${Cg}-fx9860g$C0
    Target platform is fx-9860G II: all monochrome models that support add-ins
    or can be flashed to support them.
  ${Cg}-fxcg50$C0
    Target platform is fx-CG 50; there is some compatibility with fx-CG 10/20.

Options that affect the behavior of the library $C_[${Cp}default$C_]$C0:
  $Cr-boot-log $C_[${Cp}disabled$C_]$C0
    Enable an 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 $C_[${Cp}disabled$C_]$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-lax $C_[${Cp}disabled$C_]$C0
    Make more assumptions about functions parameters. This disables coordinate
    checks in drawing functions. Be careful!
  $Cr-extended-libc $C_[${Cp}disabled$C_]$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 $C_[${Cp}disabled$C_]$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 $C_[${Cp}default$C_]$C0:
  $Cr-atexit-max$C0=${Cg}integer$C_ [${Cp}16$C_]$C0
    Number of exit handlers that can be registered by atexit().
  $Cr-timer-slots$C0=${Cg}integer$C_ [${Cp}16$C_]$C0
    Number of virtual timers that may be registered at the same time.
  $Cr-events-queue-size$C0=${Cg}integer$C_ [${Cp}64$C_]$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;;

	-fx9860g)
		conf_target="FX9860G";;
	-fxcg50)
		conf_target="FXCG50";;

	-boot-log)		conf[GINT_BOOT_LOG]=true;;
	-no-syscalls)		conf[GINT_NO_SYSCALLS]=true;;
	-lax)			conf[GINT_LAX]=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

#
#  Checking mandatory arguments
#

if [[ ! $conf_target ]]; then
	echo -e "$error No target specified. See $0 --help."
	fail=true;
fi

#
#  Output config
#

output_config()
{
	[ ${conf_target} == "FX9860G" ] \
	&& echo "cfg_target = fx" \
	|| echo "cfg_target = cg"

	echo -n "cfg_macros ="
	echo -n " -D$conf_target"

	[ "${conf[GINT_BOOT_LOG]}"      ] && echo -n " -DGINT_BOOT_LOG"
	[ "${conf[GINT_NO_SYSCALLS]}"   ] && echo -n " -DGINT_NO_SYSCALLS"
	[ "${conf[GINT_LAX]}"		] && echo -n " -DGINT_LAX"
	[ "${conf[GINT_EXTENDED_LIBC]}" ] && echo -n " -DGINT_EXTENDED_LIBC"
	[ "${conf[GINT_STATIC_GRAY]}"   ] && echo -n " -DGINT_STATIC_GRAY"

	echo -n " -DATEXIT_MAX=${conf[ATEXIT_MAX]}"
	echo -n " -DTIMER_SLOTS=${conf[TIMER_SLOTS]}"
	echo -n " -DEVENTS_QUEUE_SIZE=${conf[EVENTS_QUEUE_SIZE]}"

	echo ""

	[ "${conf[GINT_EXTENDED_LIBC]}" != "" ] && echo "cfg_ext = true"
}

if $fail; then
	echo "Output file $output has not been modified."
else
	mkdir -p config
	output_config > $output
	echo "Configuration saved in $output, ready to make!"
fi