#!/bin/bash
#
# The 'run' performs a simple test that verifies that S2I image.
# The main focus here is to excersise the S2I scripts.
#
# IMAGE_NAME specifies a name of the candidate image used for testing.
# The image has to be available before this script is executed.
#
IMAGE_NAME=${IMAGE_NAME:-rhscl/nginx-18-rhel7}

# TODO: Make command compatible for Mac users
test_dir="$(readlink -zf $(dirname "${BASH_SOURCE[0]}"))"
image_dir=$(readlink -zf ${test_dir}/..)

# TODO: This should be part of the image metadata
test_port=8080

info() {
  echo -e "\n\e[1m[INFO] $@...\e[0m\n"
}

image_exists() {
  docker inspect $1 &>/dev/null
}

container_exists() {
  image_exists $(cat $cid_file)
}

container_ip() {
  docker inspect --format="{{ .NetworkSettings.IPAddress }}" $(cat $cid_file)
}

run_s2i_build() {
  s2i build ${s2i_args} file://${test_dir}/test-app ${IMAGE_NAME} ${IMAGE_NAME}-testapp
}

prepare() {
  if ! image_exists ${IMAGE_NAME}; then
    echo "ERROR: The image ${IMAGE_NAME} must exist before this script is executed."
    exit 1
  fi
  # TODO: S2I build require the application is a valid 'GIT' repository, we
  # should remove this restriction in the future when a file:// is used.
  info "Build the test application image"
  pushd ${test_dir}/test-app >/dev/null
  git init
  git config user.email "build@localhost" && git config user.name "builder"
  git add -A && git commit -m "Sample commit"
  popd >/dev/null
}

run_test_application() {
  run_args=${CONTAINER_ARGS:-}
  docker run --user=100001 ${run_args} --cidfile=${cid_file} ${IMAGE_NAME}-testapp
}

cleanup_test_app() {
  info "Cleaning up the test application"
  if [ -f $cid_file ]; then
    if container_exists; then
      docker stop $(cat $cid_file)
      docker rm $(cat $cid_file)
    fi
    rm $cid_file
  fi
}

cleanup() {
  info "Cleaning up the test application image"
  if image_exists ${IMAGE_NAME}-testapp; then
    docker rmi -f ${IMAGE_NAME}-testapp
  fi
  rm -rf ${test_dir}/test-app/.git
}

check_result() {
  local result="$1"
  if [[ "$result" != "0" ]]; then
    info "TEST FAILED (${result})"
    cleanup
    exit $result
  fi
}

wait_for_cid() {
  local max_attempts=10
  local sleep_time=1
  local attempt=1
  local result=1
  info "Waiting for application container to start"
  while [ $attempt -le $max_attempts ]; do
    [ -f $cid_file ] && [ -s $cid_file ] && break
    attempt=$(( $attempt + 1 ))
    sleep $sleep_time
  done
}

test_s2i_usage() {
  info "Testing 's2i usage'"
  s2i usage ${s2i_args} ${IMAGE_NAME} &>/dev/null
}

test_docker_run_usage() {
  info "Testing 'docker run' usage"
  docker run ${IMAGE_NAME} &>/dev/null
}

test_scl_usage() {
  local run_cmd="$1"
  local expected="$2"

  info "Testing the image SCL enable"
  out=$(docker run --rm ${IMAGE_NAME} /bin/bash -c "${run_cmd} 2>&1")
  if ! echo "${out}" | grep -q "${expected}"; then
    echo "ERROR[/bin/bash -c "${run_cmd}"] Expected '${expected}', got '${out}'"
    return 1
  fi
  out=$(docker exec $(cat ${cid_file}) /bin/bash -c "${run_cmd}" 2>&1)
  if ! echo "${out}" | grep -q "${expected}"; then
    echo "ERROR[exec /bin/bash -c "${run_cmd}"] Expected '${expected}', got '${out}'"
    return 1
  fi
  out=$(docker exec $(cat ${cid_file}) /bin/sh -ic "${run_cmd}" 2>&1)
  if ! echo "${out}" | grep -q "${expected}"; then
    echo "ERROR[exec /bin/sh -ic "${run_cmd}"] Expected '${expected}', got '${out}'"
    return 1
  fi
}

test_for_output()
{
  local url="$1"
  local expect="$2"
  local host="${3-localhost}"
  local max_attempts=5
  local sleep_time=1
  local attempt=1
  local result=1

  info "Testing URL $url with HTTP hostname ${host} produces output $expect"

  while [ $attempt -le $max_attempts ]; do
    response=$(curl -s -H "Host: ${host}" ${url})
    echo "${response}"
    status=$?
    if [ $status -eq 0 ]; then
      if echo "${response}" | grep -q "${expect}"; then
        info "Success!"
        result=0
        break
      else
        echo "Response: ${response}"
      fi
    fi
    attempt=$(( $attempt + 1 ))
    sleep $sleep_time
  done

  return $result
}

test_connection() {
  cat $cid_file
  info "Testing the HTTP connection (http://$(container_ip):${test_port})"

  if test_for_output "http://$(container_ip):${test_port}/" "NGINX is working" &&
     test_for_output "http://$(container_ip):${test_port}/" "NGINX2 is working" localhost2 &&
     test_for_output "http://$(container_ip):${test_port}/aliased/index2.html" "NGINX2 is working"  &&
     test_for_output "http://$(container_ip):${test_port}/nginx-cfg/default.conf" "404"; then
     return 0
  fi

  return 1
}

test_application() {
  # Verify that the HTTP connection can be established to test application container
  run_test_application &

  # Wait for the container to write it's CID file
  wait_for_cid

  test_scl_usage "nginx -v" "nginx version: nginx/1.10."
  check_result $?

  test_connection
  check_result $?
  cleanup_test_app
}

cid_file=$(mktemp -u --suffix=.cid)

# Since we built the candidate image locally, we don't want S2I attempt to pull
# it from Docker hub
s2i_args="--force-pull=false"

prepare
run_s2i_build
check_result $?

# Verify the 'usage' script is working properly when running the base image with 's2i usage ...'
test_s2i_usage
check_result $?

# Verify the 'usage' script is working properly when running the base image with 'docker run ...'
test_docker_run_usage
check_result $?

# Test application with default uid
test_application

# Test application with random uid
CONTAINER_ARGS="-u 12345" test_application
cleanup

info "All tests finished successfully."