#!/bin/bash

help () {

printf "Script: 09-swap_table.sh \n"
printf "Usage: 09-swap_table.sh [ -s ] [ -r ] [ -h ] \n"
printf " -- \nWhere: \n"
printf "   -s  The inital AWS Stack name which is to create the vpc, subnet, and Aurora cluster. \n"
printf "       Whatever value is set when running script 01-install_prereq.sh is what should be retained\n"
printf "       for the rest of the demo scripts. This flag can be avoided if AURORA_DB_CFSTACK_NAME is \n"
printf "       set as an environment variable. \n"
printf "   -r  The AWS Region we're running this demo in. This setting needs to stay the same across all scripts run.\n"
printf "       Using this flag can be avoided if AWS_DEFAULT_REGION is set as an environment variable where running this script\n"
printf "   -h  show help page.\n"

}

while getopts 's:r:ch' flag; do
  case "${flag}" in
    s) AURORA_DB_CFSTACK_NAME="${OPTARG}" ;;
    r) AWS_DEFAULT_REGION="${OPTARG}" ;;
    h) show_help='true' ;;
    *) error "Unexpected option ${flag}" ;;
  esac
done

if [[  $show_help == "true" ]]
then
    help
    exit 0
fi

if [ -z $AURORA_DB_CFSTACK_NAME ]
then
    printf "The AWS stack var isn't set. Please use -s to set this stack, and ensure it's already completed sucessfully.\n"
    help
    exit 1
else
    printf "The AWS Stack is set, continuing.\n"
fi

if [ -z $AWS_DEFAULT_REGION ]
then
    printf "The AWS default region var isn't set. Please use -r to set this stack.\n"
    help
    exit 1
else
    printf "The AWS default region is set, continuing.\n"
fi

## Mainline

echo "DB stack name is:" $AURORA_DB_CFSTACK_NAME
SrcRDSEndPoint=$(aws cloudformation describe-stacks --stack-name $AURORA_DB_CFSTACK_NAME | jq -r '.Stacks[].Outputs[] | select(.OutputKey=="RDSEndPoint") | .OutputValue')
TgtRDSEndPoint=$(aws cloudformation describe-stacks --stack-name $AURORA_DB_CFSTACK_NAME | jq -r '.Stacks[].Outputs[] | select(.OutputKey=="RDSEndPoint") | .OutputValue')

echo "RDS Source endpoint:" $SrcRDSEndPoint
echo "RDS Destination endpoint" $TgtRDSEndPoint

export SrcDBUsername="pgadmin"
export SrcDBPassword="auradmin"
export TgtDBUsername="pgadmin"
export TgtDBPassword="auradmin"

#create helper function to move child table
psql postgres://$SrcDBUsername:$SrcDBPassword@$SrcRDSEndPoint -f swap_table_function.sql
psql postgres://$SrcDBUsername:$SrcDBPassword@$SrcRDSEndPoint -f swap_table.sql