#!/bin/bash

WhitepaperVersion="v0.1"
DownloadPath="/home/admin/"
WhitepaperFilename="bitcoin.pdf"

# command info
if [ $# -eq 0 ] || [ "$1" = "-h" ] || [ "$1" = "-help" ]; then
  echo "# config script to download the Bitcoin whitepaper to your Raspiblitz directly from the blockchain"
  echo "# on: downloads the Whitepaper to $DownloadPath$WhitepaperFilename"
  echo "# off: deletes the Whitepaper from $DownloadPath$WhitepaperFilename"
  echo "# bonus.whitepaper.sh [on|off|menu]"
  echo "# Whitepaper downloader script $WhitepaperVersion"
  exit 1
fi

source /mnt/hdd/raspiblitz.conf

# add default value to raspi config if needed
if ! grep -Eq "^whitepaper=" /mnt/hdd/raspiblitz.conf; then
  echo "whitepaper=off" >> /mnt/hdd/raspiblitz.conf
fi

# show info menu
if [ "$1" = "menu" ]; then
  dialog --title " Whitepaper Info" --msgbox "
This service downloads Satoshi's Whitepaper directly from the blockchain.
When enabled, the Whitepaper is downloaded to $DownloadPath$WhitepaperFilename
When disabled, the Whitepaper is deleted from $DownloadPath$WhitepaperFilename
Also, use the command 'whitepaper' from the command line to download the whitepaper directly.
" 11 78
  exit 0
fi


# switch on
if [ "$1" = "1" ] || [ "$1" = "on" ]; then

    echo ""
    echo "# ***"
    echo "# Downloading the Whitepaper to $DownloadPath$WhitepaperFilename..."
    echo "# ***"
    echo ""

    sudo -u bitcoin bitcoin-cli getblock 00000000000000ecbbff6bafb7efa2f7df05b227d5c73dca8f2635af32a2e949 0 | tail -c+92167 | for ((o=0;o<946;++o)) ; do read -rN420 x ; echo -n ${x::130}${x:132:130}${x:264:130} ; done | xxd -r -p | tail -c+9 | head -c184292 > $DownloadPath/$WhitepaperFilename
   
   # setting value in raspi blitz config
    sudo sed -i "s/^whitepaper=.*/whitepaper=on/g" /mnt/hdd/raspiblitz.conf
   
    echo "# OK - Whitepaper downloaded to $DownloadPath$WhitepaperFilename"

  exit 0
fi

# switch off
if [ "$1" = "0" ] || [ "$1" = "off" ]; then
  isInstalled=1
  if [ ${isInstalled} -eq 1 ]; then
    
    echo ""
    echo "# ***"
    echo "# Removing the Whitepaper from $DownloadPath$WhitepaperFilename..."
    echo "# ***"
    echo ""
    # setting value in raspi blitz config
    sudo sed -i "s/^whitepaper=.*/whitepaper=off/g" /mnt/hdd/raspiblitz.conf
    
    rm $DownloadPath/$WhitepaperFilename

    echo "# OK - Whitepaper removed."
  else
    echo "# The Whitepaper has not been downloaded yet."
  fi
  exit 0
fi