#!/bin/bash
# Purpose: display state of ngcpcfg setup and pending/recommended actions
################################################################################

set -e
set -u

if ! [ -r /usr/share/ngcp-ngcpcfg/functions/main ] ; then
  printf "Error: /usr/share/ngcp-ngcpcfg/functions/main could not be read. Exiting.\n" >&2
  exit 1
fi

. /usr/share/ngcp-ngcpcfg/functions/main

# main script

if ! [ -d "${NGCPCTL_MAIN:-}" ] ; then
  log_error "Directory ${NGCPCTL_MAIN:-} does not exist yet. Execute 'ngcpcfg initialise'."
  exit 1
fi

usage() {
  printf "ngcpcfg status -- supported command line options:

--local-only - do not check state on any remote host(s) (HA/PRO only)\n\n"
}

CHECK_REMOTE=true
REMOTE_INVOKED=false
while [ -n "${1:-}" ] ; do
  case "$1" in
    *--local-only*) CHECK_REMOTE=false ; shift ;;
    *--remote*)     REMOTE_INVOKED=true ; shift ;; # used when invoking ngcpcfg status remotely
    *--help*)   usage ; exit 0 ;;
    *) break ;;
  esac
done

remote_check() {
  if ! "$CHECK_REMOTE" ; then
    log_info "Skipping remote checks as requested via --local-only option."
    return 0
  fi

  if "$REMOTE_INVOKED" ; then
    log_debug "REMOTE_INVOKED is enabled, skipping remote_check"
    return 0
  fi

  if ! [ -r "$NGCPCTL_MAIN/systems.cfg" ] ; then
    log_error "File $NGCPCTL_MAIN/systems.cfg could not be read, can not check foreign servers."
    log_error "Either execute 'ngcpcfg status' without --remote option or configure $NGCPCTL_MAIN/systems.cfg."
    exit 1
  fi

  hostlist="$(cat $NGCPCTL_MAIN/systems.cfg)"
  log_debug "hostlist = $hostlist"

  for host in $hostlist ; do
    log_debug "check $host == $NNAME"
    if [[ "$host" == "$NNAME" ]] ; then
       continue
    fi

    log_info "-----------------------------------------------------------------"
    log_info "Checking state on remote system ${host}:"
    log_debug "timeout 30 ssh $host ngcpcfg status --remote"
    if timeout 30 ssh $host ngcpcfg status --remote ; then
      log_debug "ssh $host ngcpcfg status returned without error"
    else
      log_error "Error while checking state on remote host ${host}."
      exit 1
    fi
    log_info "End of state check on ${host}."
  done
}

log_debug "cd $NGCPCTL_MAIN"
cd "$NGCPCTL_MAIN"

log_info "Checking state of ngcpcfg:"
if ! [ -r /etc/ngcp-config/.git/HEAD ] ; then
  log_warn "ngcpcfg has not been initialised yet. Execute 'ngcpcfg initialise'."
  exit 0
fi

log_info "OK:   has been initialised already"

log_info "Checking state of configuration files:"
log_debug "git status | grep -q 'working directory clean'"
if git status | grep -q 'working directory clean' ; then
  log_info "OK:   nothing to commit"
else
  if git diff-index --name-only HEAD | grep -q . ; then
    log_info "ACTION_NEEDED: configuration files have been modified:"
    log_debug "git diff-index --name-only HEAD | sed \"s;^;${NGCPCTL_MAIN}/;\""
    git diff-index --name-only HEAD | sed "s;^;${NGCPCTL_MAIN}/;"
  fi

  if git ls-files --other --exclude-standard | grep -q . ; then
    log_info "ACTION_NEEDED: configuration files have been added:"
    log_debug "git ls-files --other --exclude-standard | sed \"s;^;${NGCPCTL_MAIN}/;\""
    git ls-files --other --exclude-standard | sed "s;^;${NGCPCTL_MAIN}/;"
  fi

  log_info "-> execute 'ngcpcfg build' and 'ngcpcfg commit'"
fi

if which status_ha &>/dev/null ; then
  log_debug "status_ha function"
  status_ha
fi

log_debug "cd /etc"
cd /etc

log_info "Checking state of /etc files:"
log_debug "git status | grep -q 'working directory clean'"
if git status | grep -q 'working directory clean' ; then
  log_info "OK:   nothing to commit"
else
  log_info "ACTION_NEEDED: configuration files changed (execute 'etckeeper commit [message]')"
fi

log_debug "cd $NGCPCTL_MAIN"
cd "$NGCPCTL_MAIN"

if [ -r /usr/share/ngcp-ngcpcfg/functions/ha_features ] ; then
  log_info "Checking state of shared storage:"
  log_debug "git push --dry 2>&1 | grep -q 'Everything up-to-date'"
  if git push --dry 2>&1 | grep -q 'Everything up-to-date' ; then
    log_info "OK:   nothing to push"
  else
    log_info "ACTION_NEEDED: outstanding changes to push (execute 'ngcpcfg push')"
  fi

  log_debug "git fetch --dry-run 2>&1 | grep -q From"
  if ! git fetch --dry-run 2>&1 | grep -q From ; then
    log_info "OK:   nothing to pull"
  else
    log_info "ACTION_NEEDED: outstanding changes to pull (execute 'ngcpcfg pull')"
  fi

  log_debug "remote_check"
  remote_check
fi

## END OF FILE #################################################################