#!/bin/bash

PARENT_DIR=$(dirname $PWD)
YEAR=${PARENT_DIR##*/}
DAY_RAW=${PWD##*/}
DAY=$((10#${DAY_RAW//[^0-9]/}))

SESSION_KEY=$(cat ~/.aocrc)

echo "Fetching ${YEAR} ${DAY}"
echo $SESSION_KEY

URL_DAY="https://adventofcode.com/${YEAR}/day/${DAY}"
URL_INPUT="$URL_DAY/input"

mkdir -p input

echo -e "$URL_DAY\n" > README.md

curl -b session=$SESSION_KEY $URL_DAY | sed -n '/<article class="day-desc">/,/<\/article>/p' | html2markdown --mark-code >> README.md
curl -b session=$SESSION_KEY $URL_INPUT > input/input

cat README.md

echo "Extracting example code blocks..."
# extract example code blocks
cat README.md |
  sed -n '/\[code\]/,/\[\/code\]/p' | # extract code blocks
  sed '/\[code\]/{n;d}' | # remove (blank) lines after opening bracket
  tac | # reverse line order
  sed '/\[\/code\]/{n;d}' | # remove (blank) lines after closing brackets (preceding blank lines in normal order)
  tac | # reverse line order again
  sed '/^\[\/code\]/d' | # remove closing brackets
  sed 's/^    //' | # remove indentation
  csplit - --suppress-matched --elide-empty-files --prefix='input/example' --suffix='%d' '/\[code\]/' '{*}'
echo "done."

echo
echo "Visit: $URL_DAY"