#!/bin/bash

# An interactive xpath query tool

touch .prev-xpath.tmp

GREEN='\033[0;32m'
NC='\033[0m' # no color

clear
read -p "Choose a canto: [i,r,p][1-34]" CANTO
CANTICLE="$(echo $CANTO | tr -d -c a-z)"
CANTO_NUM="$(echo $CANTO | tr -d -c 0-9)"

file="-${CANTO_NUM}.xml"

if [[ "$CANTICLE" == 'i' ]]; then
	CANTICLE='Inferno'
	file="inferno${file}"
elif [[ "$CANTICLE" == 'r' ]]; then
	CANTICLE='Purgatorio'
	file="purgatorio${file}"
elif [[ "$CANTICLE" == 'p' ]]; then
	CANTICLE='Paradiso'
	file="paradiso${file}"
else
	echo "Not a valid canto file: $file"
fi

if [[ -e "$file" ]]; then
	clear && echo -e "You are searching ${CANTICLE^} ${CANTO_NUM}.\nAdd a trailing slash ${GREEN}\`/\`${NC} to your search before submitting it. The default first two search choices are ${GREEN}\`canto\`${NC} and then ${GREEN}\`terzine\`${NC}. Press ${GREEN}<enter>${NC} for those defaults and type something else to search that.\n"
	i='0'
	read -p "Load previous: (Y)/n " PREV
	case "$PREV" in
		N|n)
			search=''
			;;
		Y|y|*)
			search="$(cat .prev-xpath.tmp)"
			;;
	esac
	while true; do
		read -e -i "$search" -p "$(echo -e "\nSearch: \n  "${GREEN}"===> "${NC})" nsearch
		if [[ "${nsearch: -1}" == '/' ]]; then			# if last char trailing slash then search
			path="${nsearch::-1}"
			echo "$path" > .prev-xpath.tmp			# remove trailing slash
			xmllint --xpath "$path" $file | batcat -l 'xml'
			exit
		elif [[ "$i" == '0' ]] && [[ "$nsearch" == '' ]]; then
			search="/canto"
		elif [[ "$nsearch" == '/canto' ]]; then
			search="/canto/terzine"
		else
			search="${nsearch}"
		fi
		i=$[$i+1]
	done	
else
	echo "Canto file not found. What directory are you in?"
fi