#!/usr/bin/env bash

###########################################
# Checks for error exit codes from httpie #
# Arguments:                              #
#   $1 Httpie exit code                   #
#   $2 Response returned by Portainer API #
###########################################
check_for_errors () {
  local exit_code=$1
  local response=$2
  if [ $exit_code -ne 0 ]; then
    case $exit_code in
        2) echo 'Request timed out!' ;;
        3) echo 'Unexpected HTTP 3xx Redirection!' ;;
        4) echo 'HTTP 4xx Client Error!' && echo $response ;;
        5) echo 'HTTP 5xx Server Error!' && echo $response ;;
        6) echo 'Exceeded --max-redirects=<n> redirects!' ;;
        *) echo 'Unholy Error!' ;;
    esac
    exit 1
  fi
}

PORTAINER_USER=${PORTAINER_USER:-"user"}
PORTAINER_PASSWORD=${PORTAINER_PASSWORD:-"password"}
PORTAINER_URL=${PORTAINER_URL:-"https://portainer.example.com"}
PORTAINER_PRUNE=${PORTAINER_PRUNE:-"false"}
PORTAINER_ENDPOINT=${PORTAINER_ENDPOINT:-"1"}
HTTPIE_VERIFY_SSL=${HTTPIE_VERIFY_SSL:-"yes"}

if [ -z ${1+x} ]; then
  echo "Error: Parameter #1 missing (stack name)"
  exit 1
fi
STACK_NAME="$1"

echo "Getting auth token..."
AUTH_TOKEN=$(http \
  --ignore-stdin \
  --verify=$HTTPIE_VERIFY_SSL \
  $PORTAINER_URL/api/auth \
  username=$PORTAINER_USER \
  password=$PORTAINER_PASSWORD \
  | jq -r .jwt)

AUTH_TOKEN=$(http \
  --check-status \
  --ignore-stdin \
  --verify=$HTTPIE_VERIFY_SSL \
  $PORTAINER_URL/api/auth \
  username=$PORTAINER_USER \
  password=$PORTAINER_PASSWORD)
check_for_errors $? "$AUTH_TOKEN"
AUTH_TOKEN=$(echo $AUTH_TOKEN | jq -r .jwt)
echo "Done"

echo "Getting stack $STACK_NAME..."
STACKS=$(http \
  --check-status \
  --ignore-stdin \
  --verify=$HTTPIE_VERIFY_SSL \
  "$PORTAINER_URL/api/stacks" \
  "Authorization: Bearer $AUTH_TOKEN")
check_for_errors $? "$STACKS"

STACK=$(echo "$STACKS" \
  | jq --arg STACK_NAME "$STACK_NAME" -jc '.[] | select(.Name == $STACK_NAME)')

if [ -z "$STACK" ]; then
  echo "Result: Stack $STACK_NAME not found."
  exit 1
fi
echo "Result: Stack $STACK_NAME found."

STACK_ID="$(echo "$STACK" | jq -j ".Id")"

echo "Deleting stack $STACK_NAME..."
DELETE=$(http \
  --ignore-stdin \
  --verify=$HTTPIE_VERIFY_SSL \
  DELETE "$PORTAINER_URL/api/stacks/$STACK_ID" \
  "Authorization: Bearer $AUTH_TOKEN")
check_for_errors $? "$DELETE"
echo "Done"