#!/bin/bash

# hitler.rip
# script to build my website using pandoc
# © 2025 hitler.rip <git@hitler.rip>
# licensed under AGPLv3-or-later; see licenses/code.md for more information

filterfile=$( realpath ./con/links.lua )
convert () {
	pandoc "$1" -o "$2" \
		-f gfm -t html5 \
		--lua-filter="$filterfile"
}

echo "[build] starting to build webpage..."

rm -rf ./tmp/
rm -rf ./web
mkdir -p ./con/
mkdir -p ./src/articles/
mkdir -p ./tmp/articles/
mkdir -p ./web/articles/
mkdir -p ./web/licenses/
mkdir -p ./web/links/
mkdir -p ./dir/

touch ./con/header.html
touch ./con/footer.html
touch ./con/style.css
touch ./con/rss-header.xml
touch ./con/rss-footer.xml
touch ./con/contact.md
touch ./src/index.md
touch ./src/articles/index.md

echo "[build] writing index..."
cd ./src/

for i in *.md; do

	echo "[build] converting: $i"

	filename=$( echo "$i" | rev | cut -c4- | rev )
	convert "$i" "../tmp/$filename.html"

	if [ "$filename" == "index" ]; then 

		convert "../con/contact.md" "../tmp/con-contact-tmp-file.html"

		echo "[build] skipping index file for later..."

	else

		mkdir -p ../web/"$filename"/

		cat ../con/header.html \
			../tmp/"$filename".html \
			../con/footer.html \
			> ../web/"$filename"/index.html

		cp "$i" ../web/"$filename"/index.md

	fi

done

echo "[build] writing articles..."
cd ./articles/

declare -A articlearr
declare -a workingarr
declare -a thebestarr

for i in *.md; do

	echo "[build] converting: $i"

	filename=$( echo "$i" | rev | cut -c4- | rev )
	convert "$i" "../../tmp/articles/$filename.html"

	if [ "$filename" == "index" ]; then
		echo "[build] skipping index file for later..."
	else

		mkdir -p ../../web/articles/"$filename"/

		cat ../../con/header.html \
			../../tmp/articles/"$filename".html \
			../../con/footer.html \
			> ../../web/articles/"$filename"/index.html

		cp "$i" ../../web/articles/"$filename"/index.md

		export WEBMETA_DATE=""

		if [ -e "$filename".meta ]; then
			echo "[build] running script: $filename.meta"
			source ./"$filename".meta
			# `.meta` is a simple shell script that uses `export` to
			# set some variables, notably:
			# WEBMETA_TITLE (title string)
			# WEBMETA_DATE (date string YYYY-MM-DD)
			# WEBMETA_AUTH (author string)
			# WEBMETA_SUMMARY (summary string)
			# please note that you have to actually check if this data is correct
			# and you should not just import random `.meta` files as they can arbitrarily
			# execute code on your system and are directly injected into the HTML.
			#
			# NOTE:
			# I do not expect to have multiple articles written on the same day
			# as I am a lazy fuck. The generator below does not expect multiple
			# articles to have the exact same date.
			# If I were you, I would maybe add hours and minutes to the timestamps
			# and maybe change this script accordingly.
		fi

		if [ "$WEBMETA_DATE" == "" ]; then
			export WEBMETA_DATE="2001-09-11*"
		fi

		articlearr["$filename"]="$WEBMETA_DATE"

	fi

done

echo "[build] sorting articles..."

workingarr=($( sort -nr < <(printf '%s\n' "${articlearr[@]}") ))

for date in "${workingarr[@]}"; do
	for key in "${!articlearr[@]}"; do
		if [ "${articlearr[$key]}" == "$date" ]; then
			thebestarr+=("$key")
		fi
	done
done

for i in "${thebestarr[@]}"; do

	export WEBMETA_TITLE=""
	export WEBMETA_DATE=""
	export WEBMETA_AUTH=""
	export WEBMETA_SUMMARY=""
	if [ -e "$i".meta ]; then
		echo "[build] re-running script: $i.meta"
		source ./"$i".meta
		# see above
	fi

	if [ "$WEBMETA_DATE" == "" ]; then
		export WEBMETA_DATE="2001-09-11*"
	fi
	if [ "$WEBMETA_AUTH" == "" ]; then
		export WEBMETA_AUTH="Anonymous"
	fi
	if [ "$WEBMETA_SUMMARY" == "" ]; then
		export WEBMETA_SUMMARY="redacted"
	fi
	if [ "$WEBMETA_TITLE" == "" ]; then
		export WEBMETA_TITLE="$i"
	fi

	if [ "$i" == "${thebestarr[0]}" ]; then
		tee ../../tmp/articles/gen-first-article-tmp.html > /dev/null << EOF
			<section class="latest-post">
				<h2>Latest Post:</h2>
				<article>
					<a href="/articles/$i"><h3>$WEBMETA_TITLE</h3></a>
					<h6><code>$WEBMETA_DATE</code> by $WEBMETA_AUTH</h6>
					<p>$WEBMETA_SUMMARY</p>
				</article>
				<a href="/articles/"><h5>See more Articles →</h5></a>
			</section>
EOF
		tee ../../tmp/articles/gen-first-article-tmp.md > /dev/null << EOF

## Latest Post:

## [$WEBMETA_TITLE](/articles/$i)
###### \`$WEBMETA_DATE\` by $WEBMETA_AUTH
$WEBMETA_SUMMARY
EOF
	fi

	touch ../../tmp/articles/gen-articles-tmp-list.html
	tee -a ../../tmp/articles/gen-articles-tmp-list.html > /dev/null << EOF
		<article>
			<a href="$i"><h2>$WEBMETA_TITLE</h2></a>
			<h6><code>$WEBMETA_DATE</code> by $WEBMETA_AUTH</h6>
			<p>$WEBMETA_SUMMARY</p>
		</article>
EOF

	touch ../../tmp/articles/gen-articles-tmp-list.md
	tee -a ../../tmp/articles/gen-articles-tmp-list.md > /dev/null << EOF

## [$WEBMETA_TITLE]($i)
###### \`$WEBMETA_DATE\` by $WEBMETA_AUTH
$WEBMETA_SUMMARY
EOF

	touch ../../tmp/articles/gen-articles-tmp-rss.xml
	tee -a ../../tmp/articles/gen-articles-tmp-rss.xml > /dev/null <<EOF
		<item>
			<title>$WEBMETA_TITLE</title>
			<pubDate>$(date -d "${WEBMETA_DATE:0:10}" +"%a, %d %b %Y %H:%M:%S +0000")</pubDate>
			<author>$WEBMETA_AUTH</author>
			<description>$WEBMETA_SUMMARY</description>
			<link>/articles/$i</link>
			<guid>/articles/$i</guid>
		</item>
EOF

done

echo "[build] generating feed..."
cd ../..

cat ./con/header.html \
	./tmp/index.html \
	./tmp/articles/gen-first-article-tmp.html \
	./tmp/con-contact-tmp-file.html \
	./con/footer.html \
	> ./web/index.html

cat ./src/index.md \
	./tmp/articles/gen-first-article-tmp.md \
	./con/contact.md \
	> ./web/index.md

cat ./con/header.html \
	./tmp/articles/index.html \
	./tmp/articles/gen-articles-tmp-list.html \
	./con/footer.html \
	> ./web/articles/index.html

cat ./src/articles/index.md \
	./tmp/articles/gen-articles-tmp-list.md \
	> ./web/articles/index.md

cat ./con/rss-header.xml \
	./tmp/articles/gen-articles-tmp-rss.xml \
	./con/rss-footer.xml \
	> ./web/articles/feed.xml

echo "[build] creating links..."

tee ./tmp/temp-content-links-site.html > /dev/null << EOF
	<h1>Links</h1>
	<span>Dynamic Link generation is currently not possible.</span>
EOF
cat ./con/header.html \
	./tmp/temp-content-links-site.html \
	./con/footer.html \
	> ./web/links/index.html

cd ./lnk/
for i in *.meta; do

	echo "[build] linking to: $i"
	filename=$( echo "$i" | rev | cut -c6- | rev )
	content=$( cat "$i" )

	mkdir -p ../web/links/"$filename"/
	tee ../web/links/"$filename"/index.html > /dev/null << EOF
	<html>
		<head>
			<meta charset="UTF-8">
			<meta name="viewport" content="width=device-width, initial-scale=1.0">
			<link rel="stylesheet" href="/style.css">
			<link rel="icon" type="image/x-icon" href="/icon.png">
			<title>$filename</title>
			<meta http-equiv="refresh" content="0; url=$content">
		</head>
		<body>
			<span><a href="$content">redirect...</a></span>
		</body>
	</html>
EOF

done
cd ..

echo "[build] creating 404 page..."
tee ./tmp/temp-404-page.html > /dev/null << EOF
	<h1>not found :(</h1>
	<span>This page does not exist on this server. <a href="/">Return home</a>.</span>
EOF
cat ./con/header.html \
	./tmp/temp-404-page.html \
	./con/footer.html \
	> ./web/404.html

echo "[build] copying static files..."
cp ./con/style.css ./web/style.css
cp ./con/icon.png ./web/icon.png
cp ./con/banner.png ./web/banner.png
cp ./licenses/* ./web/licenses/
cp -r ./dir/* ./web/

echo "[build] removing temporary build files..."
rm -rf ./tmp

echo "[build] done!"