#!/bin/sh
help() {
    echo "Usage: $0 [-d] [-r] [-t VISIBILITY] [-h] URL"
    echo ""
    echo "    Downloads the RSS feed of the URL and checks the latest post."
    echo "    It provides a simple way to copy/paste the Title and Link of the post."
    echo "    If toot is installed, it can post the status with custom visibility."
    echo "    There is also set of funny(?) random variants of the message."
    echo "    Arguments:"
    echo "    -d        Checks if the Publication Date of the post is Today."
    echo "              If not, it exits."
    echo "    -r        Uses a random expression."
    echo "    -t        Post the link with toot. A prompt will ask confirmation."
    echo "              Accepted value: direct, unlisted, public, private"
    echo "    -h        Displays this message."
    echo ""
}

while getopts ":drt:h" opt; do
  case $opt in
    d)
        TODAY=$(date +'%d %b %Y')
        CHECK_TODAY=1
        ;;
    r)
        RANDOMIZE=1
        ;;
    t)
        TOOT=1
        case "${OPTARG}" in
        direct|unlisted|public|private)
            VISIBILITY=${OPTARG}
            ;;
        *)
            echo "Invalid visibility option: --${OPTARG}"
            exit 1
            ;;
        esac
        ;;
    h)
        # Help
        help
        exit 1
        ;;
    \?)
      echo "Invalid option: -$OPTARG" >&2
      ;;
  esac
done
shift $(($OPTIND - 1))

if [[ "$*" == "" ]]; then
    help
    exit 1
fi


echo_msg () {
    echo "\n+++++"
    echo "$EXPRESSION \"$TITLE\"\n\n$LINK"
    echo "+++++\n"
}

today() {
    # Checks if pubDate is $TODAY
    echo "Checking if the post pubblication days is ${TODAY}…"
    echo $PUB_DATE | grep -q "$TODAY"
    if [[ "$?" == "0" ]]; then # pubDate is $TODAY
        echo "Published Date is today - good!"
    else
        echo "ERROR. Published Date is different than today. Exiting."
        cleanup 1
    fi
}

random() {
    EXPRESSIONS=("Latest article on my blog:"
    "Latest rant on my blog:"
    "Check out my latest post!"
    "New. Blog. Post. NOW!"
    "Just wrote a new blog post:"
    "Just hit some random keys on the keyboard and pressed \"Publish\":"
    "Just hit some random keys on my keyboard:"
    "New thoughts:"
    "New wordvomit:"
    "I could have used some cool app to publish this post. Instead I used a script. 🤖"
    "100 PRINT \"NEW BLOG POST\"\n200 PRINT"
    "Yet another article on my blog."
    "🤖 This is a random sentence chosen by a Bash script.\nSorry if it doesn't make much sense.\nAnd this is my new blog post:"
    "Roses are red. Violets are blue. Here is a new blog post:"
    "Sit down, grab a cup of tea, and click here for a new article on my blog:"
    "🧠 -> 🧑‍💻 ->"
    "$ cat new_blog_post.md\n"
    "🤖 Beep. Boop. I'm a script to share my new blog post:")
    EXPRESSION=${EXPRESSIONS[ $RANDOM % ${#EXPRESSIONS[@]} ]}
}

yes_or_no() {
    while true; do
        read -p "$* [Y]es/[N]o/[R]andom: " ynr
        case $ynr in
            [Yy]*) echo "$EXPRESSION \"$TITLE\"\n\n$LINK" | \
            /opt/homebrew/bin/toot post -v $VISIBILITY ; return 0 ;;  
            [Nn]*) echo "Exiting." ; cleanup 0 ;;
            [Rr]*) echo "\nPicking up a new expression:"; random; echo_msg ;;
        esac
    done
}

cleanup () {
    rm -f feed.xml
    rm -f feed_old.xml
    rm -f status.txt
    exit $1
}

echo "Downloading latest XML feed…"
wget -q -O feed.xml $*
if ! [[ $? == "0" ]]; then echo "Error."; cleanup 1; else echo "Done."; fi

# Check if downloaded file has <rss> tag
grep -q '<rss' feed.xml
if ! [[ $? == "0" ]]; then echo "This is not a RSS feed. Exiting."; cleanup 1; fi

# Clean up RSS from tabs
mv feed.xml feed_old.xml; cat feed_old.xml | tr -d '	' > feed.xml 

# Find 2nd clean title (1st post) and replaces / with \/
TITLE=$(awk '/<title>/{++n; if (n==2) {print; exit}}' feed.xml | sed -e 's/<title>\(.*\)<\/title>/\1/' | xargs)
#echo "TITLE: $TITLE"

# Find the link of the article
LINK=$(grep -A1 "<title>$TITLE" feed.xml | tail -n 1 | sed 's/<link>\(.*\)<\/link>/\1/' | xargs)
#echo "LINK: $LINK"

# Replace / with \/ in the link
LINK_FIXED=$(echo $LINK | sed 's./.\\/.g')

# Print whole post until pubDate tag, saves the PUB_DATE
PUB_DATE=$(sed -n "/<link>$LINK_FIXED/,/pubDate/p" feed.xml | tail -n 1 | sed 's/<pubDate>//g; s/<\/pubDate>//g')

if [[ "$CHECK_TODAY" == "1" ]]; then today; fi

EXPRESSION="Latest article on my blog:"
if [[ "$RANDOMIZE" == "1" ]]; then random; fi

echo "\nCopy and Paste this:"
echo_msg

if [[ "$TOOT" == "1" ]]; then
    which toot > /dev/null # Check if toot is installed
    if ! [[ $? == "0" ]]; then echo "ERROR. Toot is not installed. Exiting."; cleanup 1; fi
    ACCOUNT=$(toot auth | grep ACTIVE | awk '{print $2}')
    yes_or_no "Post it on Mastodon (as $ACCOUNT)?"
fi 

cleanup 0