#!/bin/bash
echo ""

## get basic info
source /home/admin/raspiblitz.info

echo "*** Adding HDD to the System ***"
echo "started from state(${state})"
sleep 5
existsHDD=$(lsblk | grep -c sda)
if [ ${existsHDD} -gt 0 ]; then
  echo "OK - HDD found as sda"
  mountOK=$(df | grep -c /mnt/hdd)
  if [ ${mountOK} -eq 1 ]; then
    echo "FAIL - HDD is already mounted"
    echo "If you want to add HDD freshly to the system, then unmount the HDD first and try again"
  else
    echo ""
    echo "*** Check HDD ***"
    formatExt4OK=$(lsblk -o UUID,NAME,FSTYPE,SIZE,LABEL,MODEL | grep BLOCKCHAIN | grep -c ext4) 
    if [ ${formatExt4OK} -eq 1 ]; then
      echo "OK - HDD is formatted with ext4 and is named BLOCKCHAIN"
      uuid=$(lsblk -o UUID,NAME,FSTYPE,SIZE,LABEL,MODEL | grep BLOCKCHAIN)
      set -- $uuid
      uuid=$1
      fstabOK=$(cat /etc/fstab | grep -c ${uuid})
      if [ ${fstabOK} -eq 0 ]; then
        # see https://github.com/rootzoll/raspiblitz/issues/360#issuecomment-467567572
        fstabAdd="UUID=${uuid} /mnt/hdd ext4 noexec,defaults 0 2"
        echo "Adding line to /etc/fstab ..."
        echo ${fstabAdd}
        # adding the new line after line 3 to the /etc/fstab
        sudo sed "3 a ${fstabAdd}" -i /etc/fstab
      else
        echo "UUID is already in /etc/fstab"
      fi
      fstabOK=$(cat /etc/fstab | grep -c ${uuid})
      if [ ${fstabOK} -eq 1 ]; then
        echo "OK - HDD is listed in /etc/fstab"
        echo ""
        echo "*** Mount HDD ***"
        sudo mkdir /mnt/hdd 2>/dev/null
        sudo mount -a
        mountOK=$(df | grep -c /mnt/hdd)
        if [ ${mountOK} -eq 1 ]; then

          echo "OK - HDD is mounted"
	        echo ""

          # setting fsk check intervall to 1
          # see https://github.com/rootzoll/raspiblitz/issues/360#issuecomment-467567572
          sudo tune2fs -c 1 /dev/sda1

          # init the RASPIBLITZ Config
          configFile="/mnt/hdd/raspiblitz.conf"
          configExists=$(sudo ls ${configFile} 2>/dev/null | grep -c 'raspiblitz.conf')
          if [ ${configExists} -eq 0 ]; then
     
            # create file and use init values from raspiblitz.info
            source /home/admin/_version.info
            sudo touch $configFile
            sudo chmod 777 ${configFile}
            echo "# RASPIBLITZ CONFIG FILE" > $configFile
            echo "raspiBlitzVersion='${codeVersion}'" >> $configFile
            echo "network=${network}" >> $configFile
            echo "chain=${chain}" >> $configFile
            echo "hostname=${hostname}" >> $configFile

            # try to determine publicIP and if not possible use localIP as placeholder 
            # https://github.com/rootzoll/raspiblitz/issues/312#issuecomment-462675101
            freshPublicIP=$(curl -s http://v4.ipv6-test.com/api/myip.php)

            # sanity check on IP data
            # see https://github.com/rootzoll/raspiblitz/issues/371#issuecomment-472416349
            echo "-> sanity check of IP data:"
            if [[ $freshPublicIP =~ ^(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))$ ]]; then
              echo "OK IPv6"
            elif [[ $freshPublicIP =~ ^([0-9]{1,2}|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.([0-9]{1,2}|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.([0-9]{1,2}|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.([0-9]{1,2}|1[0-9][0-9]|2[0-4][0-9]|25[0-5])$ ]]; then
              echo "OK IPv4"
            else
              echo "FAIL - not an IPv4 or IPv6 address"
              freshPublicIP=""
            fi

            if [ ${#freshPublicIP} -eq 0 ]; then
              localIP=$(ip addr | grep 'state UP' -A2 | tail -n1 | awk '{print $2}' | cut -f1 -d'/')
              echo "WARNING: No publicIP information at all yet - working with placeholder : ${localIP}"
              freshPublicIP="${localIP}"
            fi
            echo "publicIP='${freshPublicIP}'" >> $configFile

          fi

          # move SSH pub keys to HDD so that they survive an update
          echo "moving SSH pub keys to HDD"
          sudo cp -r /etc/ssh /mnt/hdd/ssh
          sudo rm -rf /etc/ssh
          sudo ln -s /mnt/hdd/ssh /etc/ssh
          echo "OK"
          echo ""

          # set SetupState
          sudo sed -i "s/^setupStep=.*/setupStep=40/g" /home/admin/raspiblitz.info

          echo "*** Analysing HDD Content ***"
          if [  -d "/mnt/hdd/${network}"  ]; then 
            sudo chown -R bitcoin:bitcoin /mnt/hdd/bitcoin 2>/dev/null
            sudo chown -R bitcoin:bitcoin /mnt/hdd/litecoin 2>/dev/null
            echo "Looks like the HDD is prepared with the Blockchain."

            if [ "${state}" = "recovering" ]; then
              # when HDD got added on update/provisioning
              echo "OK HDD got added ... returning to provisioning"
              exit 1
            else
              # when normal setup
              echo "Continuing with finishing the system setup ..."
              ./60finishHDD.sh
            fi

          else
            # HDD is empty - let setupBlitz - display next options
            echo "HDD empty --> go setup"
            ./10setupBlitz.sh
          fi # END Analysing HDD Content

	      else
           echo "FAIL - was not able to mount"
	      fi # END Mount check

      else
      	echo "FAIL - was not able to edit /etc/fstab"
      fi 

    else
      echo "FAIL - the HDD is not in ext4 format AND named 'BLOCKCHAIN'"
    fi
    
  fi
else
  echo "FAIL - no HDD as device sda found"
  echo "check if HDD is properly connected and has enough power - then try again with reboot"
fi