#!/bin/bash

COVER_URL=https://www.cl.cam.ac.uk/~rja14/Papers/SEv3-cover.pdf
FINAL_PDF=security-engineering-3rd-edition.pdf
INPUT_FILE="urls.txt"

function assert_installed() {
    for var in "$@"; do
        if ! which $var &> /dev/null; then
            echo "Install $var!"
            exit 1
        fi
    done
}

assert_installed wget

if [[ $@ == *'--download-cover-image'* ]]; then
  echo "Downloading cover image"
  assert_installed convert
  wget --timeout=10 --timestamping "$COVER_URL" --output-document cover.pdf
  echo "Cover Image downloaded"
fi

declare -a FILES_LIST

while IFS= read -r line
do
    FILENAME=$(basename "$line")
    FILES_LIST+=("$FILENAME")
done < "$INPUT_FILE"

echo "Starting PDF download"
wget --timeout=10 --timestamping --input-file "urls.txt"
echo "All PDFs downloaded"

pystitcher book.md