#! /bin/bash

# Copyright (c) 2017 Agnibho Mondal
# All rights reserved
#
# This file is part of Mscore.
#
# Mscore is free software: you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the Free Software
# Foundation, either version 3 of the License, or (at your option) any later
# version.
#
# Mscore is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
# PARTICULAR PURPOSE.  See the GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License along with
# Mscore.  If not, see <http://www.gnu.org/licenses/>.
#
# Agnibho Mondal
# contact@agnibho.com
# www.agnibho.com

DIR="/home/agnibho/program/mscore/data/";

INPUT=(0);
GROUP=(0 0);
G=1;
TOT=0;

function invalid {
	echo "Invalid input";
	exit 1;
}

function input {
	if [ -z "$1" ];then
		exit 1;
	else
		line=$1;
	fi
	REG=$(grep -Eo "\[.*?\]" <<< "$line" | sed "s/[][]//g" | sed "s/ //g");
	PR=$(echo "$line" | sed "s/\[.*\]//g")"[$REG] : ";
	read -p "$PR" -u 3 IN;
	if [[ -z "$IN" ]];then
		IN=0;
	fi
	if [[ "$IN" =~ ' ' ]];then
		invalid;
	elif [[ "$REG" =~ - ]];then
		l=$(echo "$REG" | sed "s/-.*//g");
		u=$(echo "$REG" | sed "s/.*-//g");
		if (( "$IN" >= "$l" && "$IN" <= "$u" ));then
			INPUT+=("$IN");
			GROUP[$G]+="+$IN";
		else
			invalid;
		fi
	elif [[ "$REG" =~ , ]];then
		readarray -d , -t n <<< "$REG";
		if [[ "${n[@]}" =~ "$IN" ]];then
			INPUT+=("$IN");
			GROUP[$G]+="+$IN";
		else
			invalid;
		fi
	elif [[ "$REG" =~ [yn] ]];then
		if [[ "${IN,,}" =~ [y1] ]];then
			INPUT+=(1);
			GROUP[$G]+="+1";
		elif [[ "${IN,,}" =~ [n0] ]];then
			INPUT+=(0);
		else
			invalid;
		fi
	else
		echo "Error processing [$REG]";
		exit 1;
	fi
}

function output {
	if [ -z "$1" ];then
		exit 1;
	else
		line=$1;
	fi
	FLAG="";
	readarray -t PATS <<<"$(grep -Po "\[.*?\]" <<< "$line")";
	for P in "${PATS[@]}";do
		I="$(echo "$P" | sed "s/[][]//g" | sed "s/ //g" | sed "s/vt/$TOT/g" | sed -r "s/v([0-9]+)/$\{INPUT\[\1\]\}/g" | sed -r "s/g([0-9]+)/$\{GROUP\[\1\]\}/g" | sed -r "s/([=\<\>])/ \1 /g" | sed -r "s/([\<\>])\s+=/\1=/g" | sed "s/and/ \&\& /g" | sed "s/or/ \|\| /g")";
		if [[ "$I" =~ [=\<\>\&\|] ]];then
			if ! eval "(( $I ))";then
				return;
			fi
			line=${line/"$P"/""};
		elif [[ "$I" == "!" ]];then
			FLAG="stop";
			line=${line/"$P"/""};
		else
			I=$(eval "echo $I" | bc);
			line=${line/"$P"/"$I"};
		fi
	done
	echo "$line";
	if [ "$FLAG" = "stop" ];then
		exit 0;
	fi
}

if [ -f "$DIR$1" ];then
	SECTION="";
	while read line;do
		if [[ "$line" =~ ^# ]];then
			continue;
		elif [[ "$line" =~ ^= ]];then
			if [ "$SECTION" = "input" ];then
				SECTION="output";
				TOT=$(echo ${INPUT[@]} | sed "s/ /+/g" | bc);
				GROUP[$G]=$(echo "${GROUP[$G]}"|bc);
			fi
			echo "$line";
		elif [[ "$line" =~ ^- ]];then
			if [ "$SECTION" = "input" ];then
				GROUP[$G]=$(echo "${GROUP[$G]}"|bc);
				((G++));
				GROUP[$G]="0";
			fi
			echo "$line";
		elif [[ "$line" =~ \[.*?\] ]];then
			if [ "$SECTION" = "input" ];then
				input "$line";
			elif [ "$SECTION" = "output" ];then
				output "$line";
			else
				SECTION="input";
				input "$line";
			fi
		else
			echo "$line";
		fi
	done 3<&0 < "$DIR$1"
else
	echo "Available scores: ";
	ls "$DIR";
fi