#!/bin/bash -e

APP=$1
ENV=$2

if [ -z "$APP" ] || [ -z "$ENV" ]; then
  echo -e "Missing parameters\n\nUsage:\n\tswitch_kubectl [app_name] [environment]"
  exit 0
fi

if [ "$1" == "-h" ] || [ "$1" == "--help" ]; then
  echo -e "Usage:\n\tswitch_kubectl [app_name] [environment]"
  exit 0
fi

RED=`tput setaf 1`
GREEN=`tput setaf 2`
RESET=`tput sgr0`

CONTEXT=`kubectl config view | grep "${APP}-${ENV}" -m 1 | sed -E "s/[[:space:]]+name\:[[:space:]]//"`
echo "Using ${CONTEXT}"

SWITCHED_CONTEXT=`kubectl config use-context ${CONTEXT}`
echo $SWITCHED_CONTEXT

SC=`echo ${SWITCHED_CONTEXT} | grep -o "${CONTEXT}"`
if [ "${SC}" != "${CONTEXT}" ]; then
  echo "Bad kubectl context!"
else
  echo "Successfully switched kubernetes to application [ ${RED}${APP}${RESET} ] on [ ${GREEN}${ENV}${RESET} ]"
fi