#!/bin/bash

set -eo pipefail

NEWSLETTER=""

function write {
  local content=$@
  NEWSLETTER="${NEWSLETTER}${content}"
}

function writeln {
  write "$@\n"
}

function include_illustration_of_the_week {
  local illustration_of_the_week=$(date +"illustrations/%Y/small/%U.jpg")
  
  if [ ! -f "${illustration_of_the_week}" ]; then
    return
  fi

  writeln
  writeln "![L'illustration de la semaine](https://forge.cadoles.com/wpetit/cazette/raw/branch/master/$illustration_of_the_week)"
}

function include_subreddit_top_of_the_week {
  local title=$1
  local subreddit=$2
  local total=$3
  local top_of_the_week=$(curl -sk --retry 5 "https://www.reddit.com/r/$subreddit/top/.rss?sort=top&t=week" | npx xml2json | jq --arg TOTAL "$total" '.feed.entry[0:($TOTAL|tonumber)]')

  if [ -z "$top_of_the_week" ]; then
    return
  fi

  writeln
  writeln "#### ${title}"

  for index in $(seq 0 $(( $total - 1 ))); do
    local entry=$(echo  $top_of_the_week | jq --arg INDEX $index '.[$INDEX | tonumber]')
    local entry_title=$(echo $entry | jq -r '.title')
    local entry_url=$(echo $entry | jq -r '.link.href')
    local entry_author=$(echo $entry | jq -r '.author? | .name?')

    write "- [${entry_title}]($entry_url)"
    if [ ! -z  "${entry_author}" ]; then
      writeln "  par _ ${entry_author} _"
    else
      writeln
    fi
  done
}

function include_linuxfr_latest {
  local total=5
  local linuxfr_latest=$(curl -sk --retry 5 https://linuxfr.org/news.atom | npx xml2json | jq --arg TOTAL "$total" '.feed.entry[0:($TOTAL|tonumber)]')

  if [ -z "$linuxfr_latest" ]; then
    return
  fi

  writeln
  writeln "#### LinuxFr.org"

  for index in $(seq 0 $(( $total - 1 ))); do
    local entry=$(echo  $linuxfr_latest | jq --arg INDEX $index '.[$INDEX | tonumber]')
    local entry_title=$(echo $entry | jq -r '.title')
    local entry_url=$(echo $entry | jq -r '.link.href')
    local entry_author=$(echo $entry | jq -r '[.author? | .[] | .name?] | join(", ")')

    write "- [${entry_title}]($entry_url)"
    if [ ! -z  "${entry_author}" ]; then
      writeln "  par _ ${entry_author} _"
    else
      writeln
    fi
  done
}

function include_hackernews_top5 {
  local hackernews_top5=$(curl -sk --retry 5 https://hacker-news.firebaseio.com/v0/topstories.json | jq -r '.[0:5] | .[]')

  if [ -z "$hackernews_top5" ]; then
    return
  fi

  writeln
  writeln "#### Hackernews"

  for story_id in ${hackernews_top5}; do
    local hackernews_story=$(curl -sk --retry 5 https://hacker-news.firebaseio.com/v0/item/$story_id.json?print=pretty)
    local story_title=$(echo $hackernews_story | jq -r '.title')
    local story_url=$(echo $hackernews_story | jq -r '.url')
    local story_author=$(echo $hackernews_story | jq -r '.by')

    write "- [${story_title}](${story_url})"
    if [ ! -z  "${story_author}" ]; then
      writeln " par _ ${story_author} _"
    else
      writeln
    fi
  done
}

function main() {
  include_subreddit_top_of_the_week "Généralités" "programmation" 5
  include_subreddit_top_of_the_week "Go" "golang" 5
  include_subreddit_top_of_the_week "Kubernetes" "kubernetes" 5
  include_subreddit_top_of_the_week "Python" "python" 5
  include_subreddit_top_of_the_week "PHP" "php" 5
  include_linuxfr_latest
  include_hackernews_top5
  include_illustration_of_the_week

  if [ ! -z "$NEWSLETTER" ]; then
    echo "### La Cazette N°$(date +%Y-%U)"
    echo "_Chaque semaine, une sélection de nouvelles et d'articles de la communauté du développement logiciel._"
    echo -e $NEWSLETTER
    echo "**Bonne semaine à tous ! :robot:**"
    echo 
    echo "_Generated by [cazette](https://forge.cadoles.com/wpetit/cazette)_"
  fi 
}

main