#!/bin/bash
# Der Standard RSS helper - fetches via internal fivefilters
set -e

FIVEFILTERS_URL="https://fivefilters.cloonar.com"
RSS_SOURCE="https://www.derstandard.at/rss"

CURL="curl -sk"

usage() {
  cat <<EOF
Usage: derstandard <command> [args]

Commands:
  items [max]              Title + URL pairs for selection (default: 50)
  article <url>            Fetch single article content
  articles <url1,url2,...> Fetch multiple articles (comma-separated)
  urls [max]               Article URLs only
  titles [max]             Article titles only
  raw [max]                Full RSS XML
EOF
}

fetch_feed() {
  local max="${1:-50}"
  local encoded_url=$(printf '%s' "$RSS_SOURCE" | sed 's/:/%3A/g; s/\//%2F/g')
  $CURL "${FIVEFILTERS_URL}/makefulltextfeed.php?url=${encoded_url}&max=${max}&links=preserve&exc="
}

fetch_single_article() {
  local url="$1"
  local encoded_url=$(printf '%s' "$url" | sed 's/:/%3A/g; s/\//%2F/g; s/\?/%3F/g; s/&/%26/g; s/=/%3D/g')
  $CURL "${FIVEFILTERS_URL}/makefulltextfeed.php?url=${encoded_url}&max=1&links=preserve&exc=" | \
    perl -0777 -ne 'print $1 if /<item>.*?<description>(.*?)<\/description>.*?<\/item>/s' | \
    sed 's/&lt;/</g; s/&gt;/>/g; s/&quot;/"/g; s/&amp;/\&/g' | \
    sed 's/<[^>]*>//g' | \
    tr '\n' ' ' | sed 's/  */ /g'
}

decode_entities() {
  sed 's/&amp;amp;/\&/g; s/&amp;/\&/g; s/&lt;/</g; s/&gt;/>/g; s/&quot;/"/g; s/&#39;/'"'"'/g'
}

case "${1:-}" in
  items)
    feed=$(fetch_feed "${2:-50}")
    titles=$(echo "$feed" | grep -oP '<title>\K[^<]+' | tail -n +2 | decode_entities)
    urls=$(echo "$feed" | grep -oP '<link>\K[^<]+' | grep "derstandard.at/story")
    paste <(echo "$titles") <(echo "$urls") 2>/dev/null | head -"${2:-50}"
    ;;
  article)
    [ -z "${2:-}" ] && { echo "Usage: derstandard article <url>"; exit 1; }
    fetch_single_article "$2"
    ;;
  articles)
    [ -z "${2:-}" ] && { echo "Usage: derstandard articles <url1,url2,...>"; exit 1; }
    IFS=',' read -ra URLS <<< "$2"
    for url in "${URLS[@]}"; do
      # Extract title from URL slug
      title=$(echo "$url" | grep -oP '/\d+/\K[^?]+' | tr '-' ' ' | sed 's/.*/\u&/')
      echo "=== ${title} ==="
      fetch_single_article "$url"
      echo ""
      echo ""
    done
    ;;
  urls)
    fetch_feed "${2:-50}" | grep -oP '<link>\K[^<]+' | grep "derstandard.at/story"
    ;;
  titles)
    fetch_feed "${2:-50}" | grep -oP '<title>\K[^<]+' | tail -n +2 | decode_entities
    ;;
  raw)
    fetch_feed "${2:-50}"
    ;;
  *)
    usage
    ;;
esac