#! /usr/bin/env bash

source ./gmirator.conf

COMMAND=$1
PARAM=$2

make_gemlogs_index() {

	rm articles.gmi.temp

	echo "generating articles.gmi.temp"
	ls $LGMI/gemlog | grep -v 'index' | sort -r \
	| while read fname; do
    	local date=$(echo "$fname" | sed "s/_.*//")
    	local title=$(head -1 $LGMI/gemlog/$fname | sed "s/# //")
    	echo "=> /gemlog/$fname $date - $title" >> $WORKDIR/articles.gmi.temp
	done
	head $WORKDIR/articles.gmi.temp > $WORKDIR/head-articles.gmi.temp

	echo "generating gemlog/index.gmi"
	sed -i -e "/^## logs/,//{
    	/^#/!d
	}" -e "/^## logs/{
		a
    	r $WORKDIR/articles.gmi.temp
	}" $LGMI/gemlog/index.gmi

	echo "generating index.gmi"
	sed -i -e "/^## logs/,//{
    	/^#/!d
	}" -e "/^## logs/{
		a => tinylog.gmi tinylogs go here
		a => gemlog/index.gmi full gemlogs here
    	a
    	r $WORKDIR/head-articles.gmi.temp
    	a
	}" $LGMI/index.gmi
	
	echo "generate footer for every .gmi"
	while read -r file; do
		sed -i -e "/^---/,//{
			d
		}" $file
		cat $WORKDIR/footer.gmi >> $file
	done < <(find $LGMI -type f -name \*.gmi)
	echo "DONE :)"
}

inline_parsing() {
	sed -E 's|\*([^\*]+)\*|<em>\1</em>|g' |
		sed -E 's|~~(.*)~~|<s>\1</s>|g'
}

gmi2html() {
	local in_list=no
	local in_preformated=no

	while read -r line; do
		if [[ $line == "---" ]]; then
			break
		fi

		if [[ "$in_list" == yes ]]; then
			if [[ "$line" == '* '* ]]; then
				printf "<li>%s</li>\n" "${line/\* /}" | inline_parsing
				continue
			else
				in_list=no
				printf "</ul>\n"
			fi
		elif [[ "$in_preformated" == yes ]]; then
			if [[ "$line" == '```'* ]]; then
				in_preformated=no
				printf "</pre>\n"
			else
				printf "%s\n" "$line"
			fi
			continue
		fi

		case "$line" in
			'')
				;;
			'* '*)
				in_list=yes
				printf "<ul>\n<li>%s</li>\n" "${line/\* }" | inline_parsing
				;;
			'# '*)
				printf "<h1>%s</h1>\n" "$line"
				;;
			'## '*)
				printf "<h2>%s</h2>\n" "$line"
				;;
			'### '*)
				printf "<h3>%s</h3>\n" "$line"
				;;
			'=> '*)
				fname=$(echo "$line" | sed 's/=> \([^ ]*\).*/\1/')
				fname=${fname/.gmi/.html}
				desc=$(echo "$line" | sed 's/=> [^ ]* \(.*\)/=> \1/')
				printf "<a href=\"%s\">%s</a><br>\n" "$fname" "$desc"
				;;
			'```'*)
				in_preformated=yes
				printf "<pre>\n"
				;;
			*)
				printf "<p>%s</p>\n" "$line" | inline_parsing
				;;
		esac
	done
}

make_html() {
	while read -r file; do
		local dest=${file/.gmi/.html}
		dest=${dest/\/content\//\/html-output\/}

		printf "... %s\n" $dest
		cat $HTML_HEADER > $dest
		gmi2html < "$file" >> $dest
		cat $HTML_FOOTER >> $dest
	done < <(find $LGMI -type f -name \*.gmi)
	echo "Done generating HTML"
	echo "Copying statis assets"
	cp $ASSETS/* $LHTML
}

synchronise() {
	if [[ $PARAM == "html" ]]; then
		echo "Synchronising HTML content with remote"
		rsync -aP -e "ssh -p 1312" $LHTML $RHTML
	elif [[ $PARAM == "gmi" ]]; then
		echo "Synchtonising GMI content with remote"
		rsync -aP -e "ssh -p 1312" $LGMI $RGMI
	else
		echo "Synchtonising GMI and HTML content with remote"
		rsync -aP -e "ssh -p 1312" $LHTML $RHTML
		rsync -aP -e "ssh -p 1312" $LGMI $RGMI
	fi
}

generate() {
	case $1 in
		gmi)
			make_gemlogs_index
			;;
		html)
			make_html
			;;
	esac
}

usage() {
    echo "\
Usage: $0 <COMMAND>

Commands:
	gen			generates output
	sync		synchronises files with server with rsync
"
}

main() {
	case $COMMAND in
		gen)
			generate $PARAM
			;;
		sync)
			synchronise
			;;
		*)
			usage
			;;
	esac
}

main