#!/bin/bash
set -euo pipefail
IFS=$'nt'

# -e: immediately exit if any command has a non-zero exit status
# -o: prevents errors in a pipeline from being masked
# IFS new value is less likely to cause confusing bugs when looping arrays or arguments (e.g. $@)

usage() { echo "Usage: $0 -i <subscriptionId> -g <resourceGroupName> -n <deploymentName> -l <resourceGroupLocation>" 1>&2; exit 1; }

declare subscriptionId=""
declare resourceGroupName=""
declare deploymentName=""
declare resourceGroupLocation=""

declare kvResourceGroupName=""

# Initialize parameters specified from command line
while getopts ":i:g:n:l:" arg; do
    case "${arg}" in
        i)
            subscriptionId=${OPTARG}
            ;;
        g)
            resourceGroupName=${OPTARG}
            ;;
        n)
            deploymentName=${OPTARG}
            ;;
        l)
            resourceGroupLocation=${OPTARG}
            ;;
        esac
done
shift $((OPTIND-1))

#Prompt for parameters is some required parameters are missing
if [[ -z "$subscriptionId" ]]; then
    echo "Subscription Id:"
    read subscriptionId
    [[ "${subscriptionId:?}" ]]
fi

if [[ -z "$resourceGroupName" ]]; then
    echo "ResourceGroupName:"
    read resourceGroupName
    [[ "${resourceGroupName:?}" ]]
fi

if [[ -z "$deploymentName" ]]; then
    echo "DeploymentName:"
    read deploymentName
fi

if [[ -z "$resourceGroupLocation" ]]; then
    echo "Enter a location below to create a new resource group else skip this"
    echo "ResourceGroupLocation:"
    read resourceGroupLocation
fi

templateURI="https://raw.githubusercontent.com/CalCof/azure-quickstart-templates/master/glassfish-on-suse/"

templateFile="${templateURI}azuredeploy.json"

if [ ! -f "$templateFile" ]; then
    echo "$templateFile not found"
    exit 1
fi

#parameter file path
parametersFile="azuredeploy.parameters.json"

if [ ! -f "$parametersFile" ]; then
    echo "$parametersFile not found"
    exit 1
fi

if [ -z "$subscriptionId" ] || [ -z "$resourceGroupName" ] || [ -z "$deploymentName" ]; then
    echo "Either one of subscriptionId, resourceGroupName, deploymentName is empty"
    usage
fi

#login to azure using your credentials
az account show 1> /dev/null

if [ $? != 0 ];
then
    az login
fi

#set the default subscription id
az account set --subscription $subscriptionId

set +e

#Check for existing RG
az group show $resourceGroupName 1> /dev/null

if [ $? != 0 ]; then
    echo "Resource group with name" $resourceGroupName "could not be found. Creating new resource group.."
    set -e
    (
        set -x
        az group create --name $resourceGroupName --location $resourceGroupLocation 1> /dev/null
    )
    else
    echo "Using existing resource group..."
fi

#Start deployment
echo "Starting deployment..."
(
    set -x
    az group deployment create --name $deploymentName --resource-group $resourceGroupName --template-uri $templateFile --parameters $parametersFile
)

if [ $?  == 0 ];
 then
    echo "Template has been successfully deployed"
fi