#!/usr/bin/env bash

BUILD=.build/

function extract_metadata() {
    name=$1
    file=$2
   # val=$(grep -oE "^--${name}: .+$" $file | sed -E "s/^--${name}: (.+)$/\1/")
    val=$(sed -nE "/^--${name}: .+$/s/^--${name}: (.+)$/\1/p" $file)
    if [ -z "$val" ]; then
	echo ""
	return 1
    else
	echo "$val"
	return 0
    fi
}

function generate_index() {
    base_dir=$1
    index_tmp=$(mktemp -p $BUILD "index_${base_dir}_XXXXXX.html")
    echo "<ul>" > $index_tmp
    find -type f -iname "*.html" -exec echo "<li><a href=\"{}\">{}\</a></li>" \; >> $index_tmp
    echo "</ul>" >> $index_tmp
    page_tmp=$(mktemp -p $BUILD "index_page_XXXXXX.html")
    cat _templates/page.html > $page_tmp
    sed -i -e "/CONTENT/ {
    	\<ul\>
    	r $index_tmp
	\<\/ul\>
	d}" $page_tmp
}

echo "Clearing build-cache"
rm -rf $BUILD
mkdir $BUILD

echo "Cleaning up prod folders"
echo "Deleting www"
rm -rf www
mkdir www

echo "Deleting gemini"
rm -rf gemini
mkdir gemini

echo "Building html"
# TODO
for post in _posts/*.html; do
    post_date=$(extract_metadata "post-date" $post)
    if [ -z "$post_date" ]; then
	# post is not ready to be posted
	# requires a post date
	echo "No data"
	continue;
    fi
    updated_at=$(extract_metadata "updated-at" $post)
    tags=$(extract_metadata "tags" $post)
    type=$(extract_metadata "type" $post)
    
    post_file=$(mktemp -p $BUILD "post_XXXXXXX.html")
    content_file=$(mktemp -p $BUILD "content_XXXXXX.html")
    updated_html_file=$(mktemp -p $BUILD "updated_html_XXXXXX.html")
    tags_html_file=$(mktemp -p $BUILD "tags_html_XXXXXX.html")

    echo "Using $post_file for file"
    cat _templates/page.html > $post_file
    
    echo "Using $content_file for content"
    grep -vE "^--.+: .+$" $post > $content_file

    echo "Injecting content from $content_file into $post_file"
    sed -i -e "/CONTENT/ {
    	r ${content_file}
	d}" $post_file

    echo "Injecting CSS into $post_file"
    sed -i -e "/STYLE/ {
    	r _templates/index.css
	d}" $post_file
 
    echo "Extracting page title"
    page_title=$(grep -oE -m 1 "<h1>.+</h1>" $content_file | sed -E "s,<h1>(.+)</h1>,\1,")
    sed -i -E "s/[{]PAGE_TITLE[}]/$page_title/1" $post_file

    echo "Setting type"
    if [ -z "$type" ]; then
	sed -i -E "s/[{]TYPE[}]//" $post_file
    else
	sed -i -E "s,[{]TYPE[}],/${type}," $post_file
    fi

    echo "Setting post date"
    sed -i -E "s/[{]POST_DATE_ISO[}]/${post_date}/" $post_file
    display_date=$(date -d "${post_date}" +"%B %d, %Y")
    sed -i -E "s/[{]POST_DATE_DISP[}]/${display_date}/" $post_file

    echo "Setting updated at"
    if [ -z "$updated_at" ]; then
	sed -i -E "s/[{]UPDATED[}]//" $post_file
    else
	updated_disp=$(date -d "${updated_at}" +"%B %d, %Y")
	echo "&emsp;Updated at: <time datetime=\"${updated_at}\">${updated_disp}</time>" \
	     > updated_html_file
	sed -i -e "/UPDATED/{ r ${updated_html_file} d}" $post_file
    fi
    echo "Setting tags"
    if [ -z "$tags" ]; then
	sed -i -E "s/[{]TAGS[}]//" $post_file
    else
	echo "Using tags file $tags_html_file"
	echo "&emsp; Tags: [ ${tags} ]" > $tags_html_file
	sed -i -e "/TAGS/ {
	    r $tags_html_file
	    d}" $post_file
    fi

    filename=$(basename $post)
    if [ "$type" == "blog" ]; then
	year=$(date -d "$post_date" +%Y)
	month=$(date -d "$post_date" +%m)
	day=$(date -d "$post_date" +%d)
    	mkdir -p www/blog/$year/$month/$day
	cp $post_file www/blog/$year/$month/$day/$filename
    else
	cp $post_file www/$filename
    fi
done

echo "Copying static-html"
cp -r static-html/* www/
echo "Copying res to www"
cp -r res/ www/media/
echo "Building http rss"
# TODO
./tidy.sh

echo "Generating index files"
for [ obj in www/blog/* ]; do
    if [! -d $obj ]; then
	continue;
    fi
    generate_index "$obj"
	

echo "Building gmi"
# TODO
echo "Copying static-gemini"
cp -r static-gemini/ gemini/
echo "Copying res to gemini"
cp -r res/ gemini/media/
echo "Building gemini atom"
# TODO