#!/usr/bin/env bash
BUILD=.build/

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

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

function extract_title() {
   sed -n -E "1,/<\/h1>/s/.*<h1>(.+)<\/h1>.*/\1/p1" $1
}

function generate_index() {
    local base_dir=$1
    echo "Generating index for $base_dir"
    local page_file=$(mktemp_file "index_page")    
    local content_file=$(mktemp_file "index_content")
    local indexed_files=$(mktemp_file "indexed_files")
    local title=$(basename ${base_dir})
    echo "<article>
    	 <h1>${title} index</h1>
    	 <ul>" > $content_file
    find $base_dir -type f -iname "*.html" | sort -hr > $indexed_files
    while read post; do
	post_date=$(sed -n -E "1,/datetime=/s/Posted:.*datetime=.([0-9-]+).*/\1/p1" $post)
	post_title=$(extract_title $post)
	if [ -z "${post_date}" ]; then
	    echo "<li><a href=\"${post}\">${post_title}</a></li>" >> $content_file
	else
	    echo "<li><a href=\"${post}\">${post_date} — ${post_title}</a></li>" >> $content_file
	fi
	
	    
    done <$indexed_files

    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

    #tidy
    tidy_file $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() {
    local type=$1
    local content_file=$2
    local 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
}

function set_tags() {
    local tags=$1
    local post_file=$2
    if [ -z "$tags" ]; then
	sed -i -E "s/[{]TAGS[}]//" $post_file
    else
	local tags_html_file=$(mktemp_file "tags_html")
	echo "Using tags file $tags_html_file"
	echo "<li>Tags: [ ${tags} ]</li>" > $tags_html_file
	sed -i -e "/TAGS/ {
	    r $tags_html_file
	    d}" $post_file
    fi

}

function set_post_date () {
    local post_date=$1
    local post_file=$2
    match=$(echo $post_date | sed -n -E "s/^([0-9-]+)$/\1/p")
    if [ -z "$match" ]; then
	sed -i -E "s/[{]POST_DATE[}]//" $post_file
    else
	local post_date_html=$(mktemp_file "post_date")
	display_date=$(date -d "${post_date}" +"%B %d, %Y")
	echo "<li>
		Posted: <time datetime=\"${post_date}\">${display_date}</time>
	     </li>" > $post_date_html
	sed -i -e "/POST_DATE/ {
	    r $post_date_html
	    d}" $post_file
      
    fi
}

function set_updated_at() {
    local updated_at=$1
    local post_file=$2
    if [ -z "$updated_at" ]; then
	sed -i -E "s/[{]UPDATED[}]//" $post_file
    else
	updated_html_file=$(mktemp_file "updated_html")
	updated_disp=$(date -d "${updated_at}" +"%B %d, %Y")
	echo "<li>
	     Updated on: <time datetime=\"${updated_at}\">${updated_disp}</time>
	     </li>" > $updated_html_file
	sed -i -e "/UPDATED/ {
	       r ${updated_html_file}
	    d}" $post_file
    fi
}

function push_pin() {
    local post_date=$1
    local post_url=$2
    local post_title=$3
    local pin_file=$4
    local pin_text="<li><a href=\"${post_url}\">"
    matched=$(echo "${post_date}" | sed -n -E "s/^([0-9-]+)$/\1/p")
    if [ ! -z "${matched}" ]; then
	pin_text="${pin_text}${post_date} — "
    fi
    pin_text="${pin_text}${post_title}</a></li>"
    echo $pin_text >> $pin_file
}

function add_to_rss() {
    local post_date=$1
    local post_url=$2
    local post_title=$3
    local content_file=$4
    local rss_data=$5
    local pub_date=$(date -d "${post_date}" -R)
    sed -E -e "{
    	s/[{]TITLE[}]/${post_title/\//\\/}/1;
	s,[{]LINK[}],${post_url},g;
	s/[{]PUBDATE[}]/${pub_date}/1;
	/CONTENT/ {
	r ${content_file}
	d}
    }" templates/rss-item.xml >> ${rss_data}
}

function tidy_file() {
    local file=$1
    tidy -mq -config tidy.conf $file
}

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"
pinned_html=$(mktemp_file "pinned")
rss_data=$(mktemp_file "rss_data")
echo "Using pinned file: $pinned_html"
for post in posts/*.*; do
    echo "Processing $post"
    post_date=$(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

    echo "Extracting metadata"
    updated_at=$(extract_metadata "updated-at" $post)
    tags=$(extract_metadata "tags" $post)
    type=$(extract_metadata "type" $post)
    pinned=$(extract_metadata "pinned" $post)
    notidy=$(extract_metadata "notidy" $post)
    post_file=$(mktemp_file "post")
    content_file=$(mktemp_file "content")

    # Check if gmi or HTML
    extension="${post##*.}"

    if [ "${extension}" == "gmi" ]; then
	echo "Converting gemtext 2 html"
	gmihtml="$BUILD/$(basename ${post%.*}).html"
	# todo - make gmi2html post as an article
	echo "<article>" > $gmihtml
	./modules/gmi2html/gmi2html.sh <(sed "/^--.*$/d" $post) >> $gmihtml
	echo "</article>" >> $gmihtml
	post=$gmihtml # set post file to be the temporary HTML file
    fi
    
    echo "Copying $post data into $content_file"
    cp $post $content_file

    generate_page $type $content_file $post_file
    
    echo "Setting post date"
    set_post_date "$post_date" $post_file
    echo "Setting updated at"
    set_updated_at "$updated_at" $post_file
    echo "Setting tags"
    set_tags "$tags" $post_file

    # tidy
    if [-z "$notidy" ]; then
	echo "Tidying post"
	tidy_file $post_file
    else
	echo "Skipping tidy for $post_file"
    fi
    	
    echo "Copying temp_file to www/"
    filename=$(basename $post)
    url=""
    if [ "$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/$filename
	title="$(extract_title $post_file)"
	if [ ! -z "$pinned" ]; then
	    push_pin "$post_date" \
		     "/blog/$year/$month/$day/$filename" \
		     "${title}" \
		     $pinned_html
	fi
	add_to_rss "$post_date" \
		   "/blog/$year/$month/$day/$filename" \
		   "${title}" \
		   ${content_file} \
		   ${rss_data}
    else
	path=$(extract_metadata "path" $post)
	mkdir -p www/$path
        cp $post_file www/$path/$filename
	dest=$(echo "/$path/$filename" | sed -E "s,/+,/,g")
	if [ ! -z "$pinned" ]; then
	    push_pin "$post_date" \
		     "$dest" \
		     "$(extract_title $post_file)" \
		     $pinned_html
	fi	
    fi
done

function set_pinned() {
    local pinned_html=$1
    local file=$2
    if [ -z "$pinned_html" ]; then
	sed -i -E "s/[{]PINNED[}]//" $file
    else
	sort -r -o $pinned_html $pinned_html
	sed -i -e "/PINNED/ {
	    r $pinned_html
	    d}" $file
    fi
}



echo "Generate homepage"
homepage=$(mktemp_file "homepage")
generate_page "home" posts/index.html $homepage
# clear extra tag content
set_post_date "" $homepage
set_updated_at "$(date --iso)" $homepage
set_tags "" $homepage
set_pinned "${pinned_html}" $homepage
cp $homepage www/index.html

echo "Copying static-html"
cp -r static-html/* www/

echo "Copying res to www"
cp -r res/ www/media/

echo "Building http rss"
feed=$(mktemp_file "rss_feed")
year="$(date +%Y)"
build_date="$(date -R)"
sed -E -e "{
  s/[{]YEAR[}]/$year/1;
  s/[{]BUILDDATE[}]/$build_date/g;
  /ITEMS/ {
  r ${rss_data}
  d}
}" templates/feed.rss > $feed
cp $feed www/blog/feed.rss

echo "Generating index files"
generate_index "www/blog"
generate_index "www/music"

echo "Granting permissions"
chmod -R 755 www

echo "Done generating HTML"

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