#!/usr/bin/env bash

BUILD=.build/

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

function mktemp_file() {
    name=$1
    var=$(mktemp -p $BUILD "${name}_XXXXXX")
    echo "${var}"
    return 0
}

function generate_index() {
    base_dir=$1
    echo "Generating index for $base_dir"
    page_file=$(mktemp_file "index_page")    
    content_file=$(mktemp_file "index_content")
    title=$(basename ${base_dir})
    echo "<article>
    	 <h1>${title} index</h1>
    	 <ul>" > $content_file
    find $base_dir -type f -iname "*.html" \
	 -exec echo "<li><a href=\"{}\">{}</a></li>" \; >> $content_file
    echo "</ul>
    	 </article>" >> $content_file
    sed -i "s,${base_dir},.,g" $content_file

    generate_page "index" $content_file $page_file

    # strip out the footer
    sed -i '1,/<\/footer>/{/<footer>/,$d}' $page_file
    echo "Copying $page_file to $base_dir/index.html"
    cp $page_file $base_dir/index.html
    echo "Searching for more directories to index"
    for dir in $base_dir/*; do
	if [ ! -d $dir ]; then
	    continue;
	fi
	generate_index $dir
    done
}
# generates the base page structure
# any "special" functions can go in their various code_paths
function generate_page() {
    type=$1
    content_file=$2
    page_file=$3
    echo "Using $page_file for file"
    cat _templates/page.html > $page_file
    
    echo "Using $content_file for content"
    sed -i "/^--/d" $content_file

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

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

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

    return 0
}

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=$(mktemp_file "post")
    content_file=$(mktemp_file "content")
    updated_html_file=$(mktemp_file "updated_html")
    tags_html_file=$(mktemp_file "tags_html")

    echo "Copying $post data into $content_file"
    cp $post $content_file

    generate_page $type $content_file $post_file
    
    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


    echo "Copying temp_file to www/"
    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"
dir="www/blog"
generate_index "$dir"

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