#!/usr/bin/env bash

if [ -z "${BOB_LIB}" ]; then 
    BOB_LIB=/usr/local/lib/bob
else
    BOB_LIB=./lib
fi

usage()
{
    echo
    echo "This script is made for those who want to blog and are also addicted to the command line"
    echo
    echo "Run the initiation for a start. After that, place all your future blog
    posts, written in markdown (.md or .markdown), in the draft folder."
    echo
    echo "Once you publish your blog, all the drafts in the said folder will be
    converted to html, added to the posts folder and append to the index.html"
    echo
    echo "To remove a post, just remove it from the draft folder and republish
    your blog"
    echo
    echo "bob commands :"
    echo "  help                display this help"
    echo "  init                initiate a blog"
    echo "  publish  <post>     publish the post"
    echo "  unpublish <post>    unpublish the post"
}


init()
{
    echo Name of the author of the blog :
    read author
    echo "author=$author" > .blog.conf
    echo Name of the blog :
    read blog
    echo "blog=$blog" >> .blog.conf
    echo "Language of the blog : [en]"
    read lang
    if [ -z $lang ]; then
        lang=en
    fi
    echo "lang=$lang" >> .blog.conf
    echo "Activate dark mode : (y/N)"
    read dark
    if [ -z $dark ]; then
        dark=n
    fi
    echo "dark=$dark" >> .blog.conf
    mkdir drafts
    # mkdir templates
    mkdir posts
    # mkdir css
    # _init_css
    # _index "$blog" "$lang" "$dark"
}

update_index()
{
    # Listing all posts and making an html list (with there link) out of them
    posts=$(ls -t ./posts | awk '
        BEGIN {
            print "<ul>"
        } 
        {
            ref=$0
            gsub(".html","",ref)
            gsub(/[_-]/, " ", ref)
            print "<li><a href=\"./posts/" $0 "\">" ref "</a></li>"
        } 
        END { 
            print "</ul>"
        }')

    # retrieving the template for the index.html
    template="${BOB_LIB}/template/index.html"

    # replacing {{articles}} in the template with the actual list of articles from above
    awk -v content="$posts" '{gsub(/{{articles}}/, content); print}' "$template" > "./index.html"

}

publish()
{ 
    # Storing the path of the post/article to publish 
    article_path=$1 

    # from the relative path, only retrieving the name of the article (without file extension)
    article_name=$(echo $article_path | cut -d '/' -f 2 | cut -d '.' -f 1)

    # Convert the markdown draft into an html article and storing it locally
    post=$(awk -f ${BOB_LIB}/markdown.awk ./$article_path)

    # Retrieving the html article template
    template="${BOB_LIB}/template/post.html"

    # Escaping the & for next step to not confuse awk
    escaped_post=$(echo "$post" | sed 's/&/\\&/g')

    # In the template, replacing the string {{article}} by the actual content parsed above
    awk -v content="$escaped_post" '{gsub(/\{\{article\}\}/, content); print}' "$template" > "./posts/$article_name.html"

    # moving the draft into the "published" folder
    mv ./$article_path ./drafts/published/$article_name.md

    # updating the index.html as a new article shall appear in the list
    update_index
}

publish_one()
{ 
    # Storing the path of the post/article to publish 
    # The path is supposed to have this format "./drafts/published/<article>.*
    article_path=$1 

    # from the relative path, only retrieving the name of the article (without file extension)
    article_name=$(echo $article_path | cut -d '/' -f 4 | cut -d '.' -f 1)

    # Convert the markdown draft into an html article and storing it locally
    post=$(awk -f ${BOB_LIB}/markdown.awk ./$article_path)

    # Retrieving the html article template
    template="${BOB_LIB}/template/post.html"

    # Escaping the & for next step to not confuse awk
    escaped_post=$(echo "$post" | sed 's/&/\\&/g')

    # In the template, replacing the string {{article}} by the actual content parsed above
    awk -v content="$escaped_post" '{gsub(/\{\{article\}\}/, content); print}' "$template" > "./posts/$article_name.html"
}

publish_all()
{
    # List all drafts to be published
    published=$(ls -1 ./drafts/published)

    # turning it into an array
    published_array=($published)
    
    # Remove all html articles in case a previously published one was removed
    rm ./posts/*.html
    
    # Publish them one by one (ie turning md into html)
    for file in "${published_array[@]}"; do
        publish_one ./drafts/published/$file
    done

    # updating the index.html as new articles are supposedly present and some may be removed
    update_index
}

unpublish()
{
    # storing the path of the article
    article_path=$1

    # from the relative path, only retrieving the name of the article (without file extension)
    article_name=$(echo $article_path | cut -d '/' -f 2 | cut -d '.' -f 1)

    # removing the html article
    rm ./$article_path

    # moving the ex-published article into the draft folder
    mv ./drafts/published/$article_name.md ./drafts/$article_name.md

    # updating index as a article is to be removed from the list
    update_index
}

unpublish_all()
{
    rm ./posts/*
    mv ./drafts/published/* ./drafts/
}

deploy()
{
    echo "TODO"
}

if [[ $# -eq 0 ]]; then
    usage
elif [[ "$1" == "help" ]]; then
    usage
elif [[ "$1" == "usage" ]]; then
    usage
elif [[ "$1" == "init" ]]; then
    init
elif [[ "$1" == "publish" ]]; then
    publish_all
elif [[ "$1" == "deploy" ]]; then
    deploy
elif [[ "$1" == "help" ]]; then
    usage
fi