#!/bin/bash

# Given the base URLs of two SAP Sailing servers, obtains their /sailingserver/api/v1/leaderboardgroups
# service output, sorts it, compares them, and if equal, obtains all corresponding leaderboardgroups/*
# documents and compares those in turn.
#
# When used with -a (use REST API) then optionally -b can be used to provide a bearer token to
# authenticate a subject. Furthermore, in -a mode the exit status, if not 0 for OK will be the
# API's HTTP response status code modulo 256, e.g., 153 in case the response status cod ewas 409.
# See https://www.sapsailing.com/sailingserver/webservices/api/v1/compareServers.html for details
# about possible API response codes.
#
# The -c ("continue"), -e ("exit on error"), and -l ("list") options will be ignored when
# the -a option ("use REST API") is used.

options='ab:cevl'
while getopts $options option
do
    case $option in
        a) useRestApi="1";;
        b) BEARER_TOKEN="${OPTARG}";;
        c) continue="1";;
	e) exitOnError="1";;
	v) verbose="1";;
        l) list="1";;
        \?) echo "Invalid option"
            exit 4;;
    esac
done
shift $((OPTIND-1))

if [ "$verbose" = "1" ]; then
  WGET_ERR=/dev/stderr
  WGET_QUIET=""
else
  WGET_ERR=/dev/null
  WGET_QUIET="--quiet"
fi

OLDSERVER=$1
NEWSERVER=$2
OLDGROUPS=leaderboardgroups.old.sed
NEWGROUPS=leaderboardgroups.new.sed
OLDGROUPS_FOR_CONTINUE=${OLDGROUPS}.continue
NEWGROUPS_FOR_CONTINUE=${NEWGROUPS}.continue

# Check old and new server for healthy status; no point in preparing for a switch if any
# of them is unhealthy
if ! curl --fail --silent "${OLDSERVER}/gwt/status" >/dev/null; then
  echo "${OLDSERVER} unhealthy. Aborting."
  exit 1
fi
if ! curl --fail --silent "${NEWSERVER}/gwt/status" >/dev/null; then
  echo "${NEWSERVER} unhealthy. Aborting."
  exit 1
fi

if [ "${useRestApi}" = "1" ]; then
  if [ -n "${BEARER_TOKEN}" ]; then
    AUTH="-H \"Authorization: Bearer ${BEARER_TOKEN}\""
  else
    AUTH=""
  fi
  HEADERS=$( mktemp )
  LEADERBOARD_GROUPS=""
  while [ -n "$3" ]; do
    LEADERBOARD_GROUPS="${LEADERBOARD_GROUPS} -d leaderboardgroupUUID[]=$3"
    shift
  done
  CURL_OUTPUT=$( curl -sL --dump-header "${HEADERS}" -H 'Content-Type: multipart/form-data' "${NEWSERVER}/sailingserver/api/v1/compareservers" -d "server2=${OLDSERVER}" ${AUTH} ${LEADERBOARD_GROUPS} 2>${WGET_ERR} )
  echo "${CURL_OUTPUT}"
  HTTP_STATUS=$( cat "${HEADERS}" | grep "^HTTP\/[0-9.]* [0-9]\{3\}" | tail -1 | sed -e 's/^HTTP\/[0-9.]* \([0-9]\{3\}\).*$/\1/' )
  rm -f "${HEADERS}"
  MESSAGE_SUFFIX=". HTTP_STATUS was ${HTTP_STATUS}."
  if [[ "${HTTP_STATUS}" =~ 2.. ]]; then
    echo "Success${MESSAGE_SUFFIX}" >&2
    exit 0
  else
    echo "Failed${MESSAGE_SUFFIX}" >&2
    exit ${HTTP_STATUS}
  fi
else
  # If we continue, don't download again
  if [ "$continue" != "1" ]; then
    wget --no-cache $WGET_QUIET -O - ${OLDSERVER}/sailingserver/api/v1/leaderboardgroups | jq -r '.[]' | sed -e 's/\//%2F/g' | sort >$OLDGROUPS
    wget --no-cache $WGET_QUIET -O - ${NEWSERVER}/sailingserver/api/v1/leaderboardgroups | jq -r '.[]' | sed -e 's/\//%2F/g' | sort >$NEWGROUPS
  fi

  download_and_fix_boatclasses () {
      wget --no-cache $WGET_QUIET -O - "$1/sailingserver/api/v1/leaderboardgroups/`echo $OLD_LB | sed -e 's/ /%20/g'`" | jq 'del(.leaderboards[].series[].fleets[].races[].raceViewerUrls)' | jq 'del(.displayName)' | grep -v "\"id\": \"[^\"]*\"" | grep -v "\"timepoint\": \"[^\"]*\"" | grep -v "\"timepoint-ms\":" >"$2" 2>$WGET_ERR
      #wget --no-cache $WGET_QUIET -O - "$1/sailingserver/api/v1/leaderboardgroups/`echo $OLD_LB | sed -e 's/ /%20/g'`" | python -m json.tool | grep -v "\"id\": \"[^\"]*\"" | grep -v "\"timepoint\": \"[^\"]*\"" >"$2" 2>$WGET_ERR
  }

  diff leaderboardgroups.old.sed leaderboardgroups.new.sed
  if [ "$?" = "0" ]; then
    cp "$OLDGROUPS" "$OLDGROUPS_FOR_CONTINUE"
    cp "$NEWGROUPS" "$NEWGROUPS_FOR_CONTINUE"
    exec 3<> $OLDGROUPS
    exec 4<> $NEWGROUPS
    read OLD_LB <&3
    read NEW_LB <&4
    while [ "$OLD_LB" != "" ]; do
      if [ "$list" = "1" ]; then
        echo " * $OLD_LB"
      fi
      download_and_fix_boatclasses "${OLDSERVER}" "${OLD_LB}.old.json"
      download_and_fix_boatclasses "${NEWSERVER}" "${NEW_LB}.new.json"
      diff -b -i -B "${OLD_LB}.old.json" "${NEW_LB}.new.json"
      DIFFRESULT=$?
      if [ "$DIFFRESULT" != "0" ]; then
        echo "Difference detected in leaderboard group $OLD_LB vs. $NEW_LB"
        if [ "$exitOnError" = "1" ]; then
          cp "$OLDGROUPS_FOR_CONTINUE" "$OLDGROUPS"
          cp "$NEWGROUPS_FOR_CONTINUE" "$NEWGROUPS"
          echo "Exiting..."
          exit $DIFFRESULT
        fi
      else
        # no diff; remove the leaderboards successfully compared from both leaderboardgroups lists in case a later -c invocation occurs
        sed -i -e '1d' $OLDGROUPS_FOR_CONTINUE
        sed -i -e '1d' $NEWGROUPS_FOR_CONTINUE
      fi
      read OLD_LB <&3
      read NEW_LB <&4
    done
    cp "$OLDGROUPS_FOR_CONTINUE" "$OLDGROUPS"
    cp "$NEWGROUPS_FOR_CONTINUE" "$NEWGROUPS"
  else
    # pass on diff result to caller
    exit $?
  fi
fi