#!/bin/env bash

set -e

mkdir -p pub/

rm -f res/diag/*
mkdir -p res/diag

cp index.md pub/index.md
printf "\n\n" >>pub/index.md

export MERMAID_FILTER_FORMAT="svg"
export MERMAID_FILTER_THEME="dark"
export MERMAID_FILTER_BACKGROUND="transparent"
export MERMAID_FILTER_LOC="res/diag"
export MERMAID_FILTER_IMAGE_CLASS="mermaid"

ARGS="-A append.html -A common.html -F mermaid-filter --toc --css style.css -t html -s --citeproc --bibliography=bib.bib --biblatex --csl bib.csl -L ./server-katex/filter.lua"
NHEAD=13

function generate_index() {
	pandoc --css index.css --css style.css -A common.html -t html "$1" -s -L ./server-katex/filter.lua -o "$2" &
}

# public
declare -A all_tags
declare -A all_posts
for file in $(ls -1 md/*.md | sort -r); do
	EXTRA=""
	plot="$(head -n$NHEAD "$file" | grep -m 1 plot | cut -c 7-)"
	[[ "$plot" = "true" ]] && EXTRA="-A plot.html"

	name="$(basename $file | cut -f 1 -d '.')"
	title="$(head -n$NHEAD "$file" | grep -m 1 ^title | cut -c 8-)"
	tags="$(head -n$NHEAD "$file" | grep -m 1 ^tags | cut -c 7-)"
	date="$(echo $name | rev | cut -c 4- | rev)"
	pubdate="$(head -n$NHEAD "$file" | grep -m 1 ^date | cut -c 6-)"
	author="$(head -n$NHEAD "$file" | grep -m 1 ^author | cut -c 8-)"
	count="$(pandoc --lua-filter wordcount.lua "$file")"
	pandoc $ARGS $EXTRA "$file" -o "pub/$name".html &

	post="- [$title]($name.html)"
	post="$post<div>$date - $pubdate · $count words · $author</div><div class=tags>"

	tags="$(echo "$tags" | tr "," "\n")"
	while IFS= read -r tag; do
		all_tags["$tag"]="$name"$'\n'"${all_tags["$tag"]}"
		post="$post<a class=tag href='tag_$tag.html'>$tag</a>"
	done <<<"$tags"

	post="$post</div>"

	all_posts["$name"]="$post"
	echo "$post" >>pub/index.md
	echo "generated $title"
done

for tag in "${!all_tags[@]}"; do
	cp index.md "pub/tag_$tag.md"
	for name in ${all_tags[$tag]}; do
		echo "${all_posts[$name]}" >>"pub/tag_$tag.md"
	done
	generate_index "pub/tag_$tag.md" "pub/tag_$tag.html"
done

generate_index pub/index.md pub/index.html

echo "waiting..."
for job in $(jobs -p); do
	wait "$job" || echo "$job failed"
done

cp *.rss pub/
cp *.css pub/
cp -r res/ pub/

echo "done!"