#!/bin/bash

toolName="ssh"
toolIdentity=~/.ssh/id_rsa

aList=""
aHost=""
# default ssh port
aPort="22"

step_1_info() { echo "Install $toolName"; }
step_1_alias() { ALIAS="install"; }
step_1() {
  exe apt update
  exe apt install ssh
}

step_3_info() { echo "Create $toolName authentication keys"; }
step_3_alias() { ALIAS="create"; }
step_3() {
  exep "ssh-keygen -l -f $toolIdentity 2>>/dev/null"
  if [ $? -eq 0 ]; then
    echo " [I] Using key found at $toolIdentity."
    return 0
  fi
  exe ssh-keygen -b 4096 -t rsa -C "$(hostname)" -N "" -f $(realpath $toolIdentity)
}

step_5_info() {
  shift
  local arg
  local sshOption="[OPTIONS] "
  local userHost="<USER@HOST>"
  local userPort=" [PORT]"
  
  for arg in "$@" ; do
    case "$1" in
      -4)
        sshOption="-o Addressfamily=inet "
        shift
        ;;
      *)
        break
        ;;
    esac
  done
  
  if [ ! -z $1 ] ; then userHost="$1"; userPort=":22"; fi
  if [ ! -z $2 ] ; then userPort=":$2"; fi
  echo "Send key to remote host ${sshOption}${userHost}$userPort"
  echoinfo "[OPTIONS]"
  echoinfo "  -4 : Force Ipv4"
}
step_5_alias() { ALIAS="sendkey"; }
step_5() {
  shift
  local arg
  local sshOption
  local sshHost
  local sshPort=22

  for arg in "$@" ; do
    case "$1" in
      -4)
        sshOption="-o Addressfamily=inet"
        shift
        ;;
      *)
        break
        ;;
    esac
  done

  if [ -z "$1" ] || [ "$1" == "" ] ; then
    echoerr " [E] Host not provided."
    return 1
  else
    sshHost="$1"
  fi

  exep "ssh-keygen -l -f $toolIdentity 2>>/dev/null"
  saveReturn $?
  endReturn -f "Key $(realpath $toolIdentity) not found.\n     Create one first."

  if [ ! -z "$2" ] && [ "$2" != "" ] ; then
    sshPort=$2
  fi

  exe ssh-copy-id -p ${sshPort} ${sshOption} ${sshHost}
}

step_10_info() { echo "Send command(ssh)/file(scp) list to remote(s) <CMDLIST> [USER:HOST]"; }
step_10_alias() { ALIAS="sendlist"; }
step_10() {
  aList=$2
  aHost=$3
  # Set port only if not empty
  if [ ! -z "$4" ] || [ "$4" != "" ]; then
    aPort=$4
  fi
  parseList $aList
  saveReturn $?
  endReturn -f "Parsing error"
}

# parseList [CMDFILE]
# Parse a list to transfer files and/or execute commands on one or different hosts
#
# List format
# <COMMAND h,f,c>|<STRING>|[STRING2]|[OPTIONS]
#   COMMAND   h|H|host    - Change user@host:port for the following ssh/scp commands
#             f|F|file    - Source- and destination file path combination
#             c|C|command - Execute command on the remote host
#
#   STRING    h - user@host
#             f - source file path
#             c - shell command string
#
#   STRING2   h - port
#             f - destination file path
#             c - not used
#   
#   OPTIONS   h - not used
#             f - Options passed to scp
#             c - not used
#
parseList() {
  local errorMsg=""

  if [ -z "$1" ] || [ ! -f "$1" ]; then
    if [ -z "$1" ] || [ "$1" == "" ] ; then
      echoerr " [E] No Command list found"
    else
      echoerr " [E] Command list not found: $1"
    fi
    if [ ! -z "$1" ] && [ $DRY == 0 ] && [ $QUIET == 0 ] ; then
      read -p "     Create template there y/[n]? " answer
      case "$answer" in
        y|Y)
          addConf -s "$listFileTemplate" "$1"
          ;;
        *)
          ;;
      esac
    fi
    return 1
  fi

  echo " [I] Parsing $(realpath $1) ..."
  local line=1
  # Working loop without ssh "stealing standard input" by
  # https://unix.stackexchange.com/questions/24260/reading-lines-from-a-file-with-bash-for-vs-while
  while IFS='|' read -r lcmd lsrc ldst lopt<&3; do
    case "$lcmd" in
      h|H|host)
        if [ -z "$lsrc" ] || [ "$lsrc" == "" ]; then
          errorMsg="No host found"
          #Prevent unwanted actions if parsing is continued
          aHost=""
          saveReturn 1
        else
          aHost="$lsrc"
          if [ ! -z "$ldst" ] || [ "$ldst" != "" ]; then
            aPort=$ldst
          else
            # Set port (back) to default in case no port is given
            # after previous change
            aPort=22
          fi
          echo Target host: ${aHost}:$aPort
        fi
        ;;
      f|F|file)
        if [ -z "$aHost" ] || [ "$aHost" == "" ]; then
          errorMsg="No host found"
          saveReturn 1
        else 
          exe scp $lopt -P $aPort $lsrc ${aHost}:$ldst
          saveReturn $?
          errorMsg="scp to $aHost failed with $?"
        fi
        ;;
      c|C|command)
        if [ -z "$aHost" ] || [ "$aHost" == "" ]; then
          errorMsg="No host found"
          saveReturn 1
        else
          exe ssh -p $aPort $aHost $lsrc
          saveReturn $?
          errorMsg="ssh to $aHost failed with $?"
        fi
        ;;
      *)
        # Making comments possible
        ((line++))
        continue
        ;;
    esac
    getReturn
    if [ $? -ne 0 ] ; then
      echoerr -e " [E] $line:$errorMsg"
      if [ $QUIET -eq 0 ] ; then
        endReturn -f "Stop on first error"
      fi
    fi
    
    ((line++))
  done 3<"$1"
  echo " [I] Parsed $((--line)) lines"
}

listFileTemplate="# following files are send to host given on command line
f|/sourcedir/sourcefile|/destdir/destfile
f|/sourcedir/sourcefile|/destdir/destfile
# host and port are changed for the following lines
h|user@host2|port2
f|/sourcedir/sourcefile|/destdir/destfile
# copy source recursively
f|/sourcedir/sourcefile/dir|/destdir/destfile|-r
c|/destdir/updatescript.sh
# host is changed and port set to default 22 for the following lines
h|user@host
f|/sourcedir/sourcefile|/destdir/destfile
f|/sourcedir/sourcefile|/destdir/destfile
c|/destdir2/update.sh"

VERSION_SEQREV=10
. sequencer.sh