#!/bin/bash

# This script runs on every start called by boostrap.service
# It makes sure that the system is configured like the
# default values or as in the config.
# For more details see background_raspiblitzSettings.md

# use to detect multiple starts of service
#uid=$(date +%s)
#echo "started" > /home/admin/${uid}.boot

# load codeVersion
source /home/admin/_version.info

################################
# FILES TO WORK WITH
################################

# CONFIGFILE - configuration of RaspiBlitz
# used by fresh SD image to recover configuration
# and delivers basic config info for scripts 
# make raspiblitz.conf if not there
sudo touch /mnt/hdd/raspiblitz.conf
configFile="/mnt/hdd/raspiblitz.conf"

# LOGFILE - store debug logs of bootstrap
# resets on every start
logFile="/home/admin/raspiblitz.log"

# INFOFILE - state data from bootstrap
# used by display and later setup steps
infoFile="/home/admin/raspiblitz.info"

echo "Writing logs to: ${logFile}"
echo "" > $logFile
echo "***********************************************" >> $logFile
echo "Running RaspiBlitz Bootstrap ${codeVersion}" >> $logFile
date >> $logFile
echo "***********************************************" >> $logFile

# set default values for raspiblitz.info
network=""
chain=""
setupStep=0

# try to load old values if available (overwrites defaults)
source ${infoFile} 2>/dev/null

# resetting info file
echo "Resetting the InfoFile: ${infoFile}"
echo "state=starting" > $infoFile
echo "message=" >> $infoFile
echo "network=${network}" >> $infoFile
echo "chain=${chain}" >> $infoFile
echo "setupStep=${setupStep}" >> $infoFile
if [ "${setupStep}" != "100" ]; then
  echo "hostname=${hostname}" >> $infoFile
fi
sudo chmod 777 ${infoFile}

################################
# GENERATE UNIQUE SSH PUB KEYS
# on first boot up
################################

numberOfPubKeys=$(sudo ls /etc/ssh/ | grep -c 'ssh_host_')
if [ ${numberOfPubKeys} -eq 0 ]; then
  echo "*** Generating new SSH PubKeys" >> $logFile
  sudo dpkg-reconfigure openssh-server
  echo "OK" >> $logFile
fi

################################
# AFTER BOOT SCRIPT
# when a process needs to 
# execute stuff after a reboot
# it should in file
# /home/admin/setup.sh
################################

# check for after boot script
afterSetupScriptExists=$(ls /home/admin/setup.sh 2>/dev/null | grep -c setup.sh)
if [ ${afterSetupScriptExists} -eq 1 ]; then
  echo "*** SETUP SCRIPT DETECTED ***"
  # echo out script to journal logs
  sudo cat /home/admin/setup.sh
  # execute the after boot script
  sudo /home/admin/setup.sh
  # delete the after boot script
  sudo rm /home/admin/setup.sh
  # reboot again
  echo "DONE wait 6 secs ... one more reboot needed ... "
  sudo shutdown -r now
  sleep 100
fi

################################
# HDD CHECK & PRE-INIT
################################
 
# waiting for HDD to connect
hddExists=$(lsblk | grep -c sda1)
while [ ${hddExists} -eq 0 ]
  do
    # display will ask user to connect a HDD
    sed -i "s/^state=.*/state=nohdd/g" ${infoFile}
    sed -i "s/^message=.*/message='Connect the Hard Drive'/g" ${infoFile}
    sleep 5
    # retry to find HDD
    hddExists=$(lsblk | grep -c sda1)
  done

# check if the HDD is auto-mounted ( auto-mounted = setup-done)
hddIsAutoMounted=$(sudo cat /etc/fstab | grep -c '/mnt/hdd')
if [ ${hddIsAutoMounted} -eq 0 ]; then

  echo "HDD is there but not AutoMounted yet." >> $logFile
  echo "Analysing the situation ..." >> $logFile

  # detect for correct device name (the biggest partition)
  hddDeviceName="sda1"
  hddSecondPartitionExists=$(lsblk | grep -c sda2)
  if [ ${hddSecondPartitionExists} -eq 1 ]; then
    echo "HDD has a second partition - choosing the bigger one ..." >> $logFile
    # get both with size
    size1=$(lsblk -o NAME,SIZE -b | grep "sda1" | awk '{ print substr( $0, 12, length($0)-2 ) }' | xargs)
    echo "sda1(${size1})" >> $logFile
    size2=$(lsblk -o NAME,SIZE -b | grep "sda2" | awk '{ print substr( $0, 12, length($0)-2 ) }' | xargs)
    echo "sda2(${size2})" >> $logFile
    # chosse to run with the bigger one
    if [ ${size2} -gt ${size1} ]; then
      echo "sda2 is BIGGER - run with this one" >> $logFile
      hddDeviceName="sda2"
    else
      echo "sda1 is BIGGER - run with this one" >> $logFile
      hddDeviceName="sda1"
    fi
  fi

  # check if HDD is formatted EXT4
  hddExt4=$(lsblk -o NAME,FSTYPE -b /dev/${hddDeviceName} | grep -c "ext4")
  if [ ${hddExt4} -eq 0 ]; then
    echo "HDD is NOT formatted in ext4." >> $logFile
    # stop the bootstrap here ...
    # display will ask user to run setup
    sed -i "s/^state=.*/state=waitsetup/g" ${infoFile}
    sed -i "s/^message=.*/message='HDD needs SetUp (1)'/g" ${infoFile}
    exit 0
  fi

  # temp-mount the HDD
  echo "temp-mounting the HDD .." >> $logFile
  sudo mkdir /mnt/hdd
  sudo mount -t ext4 /dev/${hddDeviceName} /mnt/hdd
  mountOK=$(lsblk | grep -c '/mnt/hdd')
  if [ ${mountOK} -eq 0 ]; then
    echo "FAIL - not able to temp-mount HDD" >> $logFile
    sed -i "s/^state=.*/state=waitsetup/g" ${infoFile}
    sed -i "s/^message=.*/message='HDD failed Mounting'/g" ${infoFile}
    # no need to unmount the HDD, it failed mounting
    exit 0
  else 
     echo "OK - HDD available under /mnt/hdd" >> $logFile
  fi

  # UPDATE MIGRATION & CONFIG PROVISIONING 
  # check if HDD contains already a configuration
  echo "Check if HDD contains already a configuration .." >> $logFile
  configExists=$(ls ${configFile} | grep -c '.conf')
  if [ ${configExists} -eq 1 ]; then
    echo "Found existing configuration" >> $logFile
    source ${configFile}
    # check if config files contains basic: version
    if [ ${#raspiBlitzVersion} -eq 0 ]; then
      echo "Invalid Config: missing raspiBlitzVersion in (${configFile})!" >> ${logFile}
      configExists=0
    fi
    # check if config files contains basic: network
    if [ ${#network} -eq 0 ]; then
      echo "Invalid Config: missing network in (${configFile})!" >> ${logFile}
      configExists=0
    fi
    # check if config files contains basic: chain
    if [ ${#chain} -eq 0 ]; then
      echo "Invalid Config: missing chain in (${configFile})!" >> ${logFile}
      configExists=0
    fi
    if [ ${configExists} -eq 0 ]; then
      echo "Moving invalid config to raspiblitz.invalid.conf" >> ${logFile}
      sudo mv ${configFile} /mnt/hdd/raspiblitz.invalid.conf
    fi
  fi
  # if config is still valid ...
  if [ ${configExists} -eq 1 ]; then
    echo "Found valid configuration" >> $logFile
    sed -i "s/^state=.*/state=recovering/g" ${infoFile}
    sed -i "s/^message=.*/message='Starting Recover'/g" ${infoFile}
    echo "Calling Data Migration .." >> $logFile
    sudo /home/admin/_bootstrap.migration.sh
    echo "Calling Provisioning .." >> $logFile
    sudo /home/admin/_bootstrap.provision.sh
    sed -i "s/^state=.*/state=recovered/g" ${infoFile}
    sed -i "s/^message=.*/message='Done Recover'/g" ${infoFile}
    echo "rebooting" >> $logFile
    # set flag that system is freshly recovered and needs setup dialogs
    echo "state=recovered" >> /home/admin/raspiblitz.recover.info
    # save log file for inspection before reboot
    cp $logFile /home/admin/raspiblitz.recover.log
    sudo shutdown -r now
    exit 0
  else 
    echo "OK - No config file found: ${configFile}" >> $logFile
  fi

  # check if HDD cointains existing LND data (old RaspiBlitz Version)
  echo "Check if HDD contains existing LND data .." >> $logFile
  lndDataExists=$(ls /mnt/hdd/lnd/lnd.conf | grep -c '.conf')
  if [ ${lndDataExists} -eq 1 ]; then
    echo "Found existing LND data - old RaspiBlitz?" >> $logFile
    sed -i "s/^state=.*/state=olddata/g" ${infoFile}
    sed -i "s/^message=.*/message='No Auto-Update possible'/g" ${infoFile}
    # keep HDD mounted if user wants to copy data
    exit 0
  else 
    echo "OK - No LND data found" >> $logFile
  fi

  # check if HDD contains pre-loaded blockchain data
  echo "Check if HDD contains pre-loaded blockchain data .." >> $logFile
  litecoinDataExists=$(ls /mnt/hdd/litecoin/blocks/blk00000.dat 2>/dev/null | grep -c '.dat')
  bitcoinDataExists=$(ls /mnt/hdd/bitcoin/blocks/blk00000.dat 2>/dev/null | grep -c '.dat')

  # check if node can go into presync (only for bitcoin)
  if [ ${bitcoinDataExists} -eq 1 ]; then

    # update info file
    sed -i "s/^state=.*/state=presync/g" ${infoFile}
    sed -i "s/^message=.*/message='starting presync'/g" ${infoFile}

    # activating presync
    # so that on a hackathon you can just connect a RaspiBlitz
    # to the network and have it up-to-date for setting up
    echo "Found pre-loaded blockchain" >> $logFile

    # check if pre-sync was already activated on last power-on
    #presyncActive=$(systemctl status bitcoind | grep -c 'could not be found')
    echo "starting pre-sync in background" >> $logFile
    # starting in background, because this scripts is part of systemd
    # so to change systemd needs to happen after delay in seperate process
    sudo chown -R bitcoin:bitcoin /mnt/hdd/bitcoin 2>> $logFile
    sudo -u bitcoin /usr/local/bin/bitcoind -daemon -conf=/home/admin/assets/bitcoin.conf -pid=/mnt/hdd/bitcoin/bitcoind.pid 2>> $logFile
    echo "OK Started bitcoind for presync" >> $logFile
    sudo sed -i "s/^message=.*/message='running presync'/g" ${infoFile}
    # after admin login, presync will be stopped and HDD unmounted
    exit 0
  
  else
    echo "OK - No bitcoin blockchain data found" >> $logFile
  fi

  # if it got until here: HDD is empty ext4
  echo "Waiting for SetUp." >> $logFile
  sed -i "s/^state=.*/state=waitsetup/g" ${infoFile}
  sed -i "s/^message=.*/message='HDD needs SetUp (2)'/g" ${infoFile}
  # unmount HDD to be ready for auto-mount during setup
  sudo umount -l /mnt/hdd
  exit 0

fi # END - no automount

#####################################
# UPDATE HDD CONFIG FILE (if exists)
# needs to be done before starting LND
# so that environment info is fresh
#####################################

echo "Check if HDD contains configuration .." >> $logFile
configExists=$(ls ${configFile} | grep -c '.conf')
if [ ${configExists} -eq 1 ]; then

  # load values
  echo "load and update publicIP" >> $logFile
  source ${configFile}

  # update public IP on boot
  # wait otherwise looking for publicIP fails
  sleep 5
  freshPublicIP=$(curl -s http://v4.ipv6-test.com/api/myip.php)
  if [ ${#freshPublicIP} -eq 0 ]; then
   echo "WARNING: Was not able to determine external IP on startup." >> $logFile
  else
    publicIPValueExists=$( sudo cat ${configFile} | grep -c 'publicIP=' )
    if [ ${publicIPValueExists} -gt 1 ]; then
      # remove one 
      echo "more then one publiIp entry - removing one" >> $logFile
      sed -i "s/^publicIP=.*//g" ${configFile}
      publicIPValueExists=$( sudo cat ${configFile} | grep -c 'publicIP=' )
    fi
    if [ ${publicIPValueExists} -eq 0 ]; then
      echo "create value (${freshPublicIP})" >> $logFile
      echo "publicIP=${freshPublicIP}" >> $configFile
    else
      echo "update value (${freshPublicIP})" >> $logFile
      sed -i "s/^publicIP=.*/publicIP=${freshPublicIP}/g" ${configFile}
    fi
  fi

fi

#################################
# FIX BLOCKCHAINDATA OWNER (just in case)
# https://github.com/rootzoll/raspiblitz/issues/239#issuecomment-450887567
#################################
sudo chown bitcoin:bitcoin -R /mnt/hdd/bitcoin 2>/dev/null

################################
# DETECT FRESHLY RECOVERED SD
################################

recoveredInfoExists=$(ls /home/admin/raspiblitz.recover.info | grep -c '.info')
if [ ${recoveredInfoExists} -eq 1 ]; then
  sed -i "s/^state=.*/state=recovered/g" ${infoFile}
  sed -i "s/^message=.*/message='login to finish'/g" ${infoFile}
  exit 0
fi

################################
# SD INFOFILE BASICS
################################

# state info
sed -i "s/^state=.*/state=ready/g" ${infoFile}
sed -i "s/^message=.*/message='waiting login'/g" ${infoFile}

# determine network and chain from system

# check for BITCOIN
loaded=$(sudo systemctl status bitcoind | grep -c 'loaded')
if [ ${loaded} -gt 0 ]; then
  sed -i "s/^network=.*/network=bitcoin/g" ${infoFile}
  source /mnt/hdd/bitcoin/bitcoin.conf
  if [ ${testnet} -gt 0 ]; then
    sed -i "s/^chain=.*/chain=test/g" ${infoFile}
  else
    sed -i "s/^chain=.*/chain=main/g" ${infoFile}
  fi
fi

# check for LITECOIN
loaded=$(sudo systemctl status litecoind | grep -c 'loaded')
if [ ${loaded} -gt 0 ]; then
  sed -i "s/^network=.*/network=litecoin/g" ${infoFile}
  sed -i "s/^chain=.*/chain=main/g" ${infoFile}
fi

echo "DONE BOOTSTRAP" >> $logFile
exit 0