#!/usr/bin/env bash
# Copyright 2021 gRPC authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

set -ex -o igncr || set -ex

# Constants
readonly GITHUB_REPOSITORY_NAME="grpc"
# GKE Cluster
readonly GKE_CLUSTER_NAME="interop-test-psm-sec-v2-us-central1-a"
readonly GKE_CLUSTER_ZONE="us-central1-a"
## xDS test client Docker images
readonly CLIENT_IMAGE_NAME="gcr.io/grpc-testing/xds-interop/cpp-client"
readonly FORCE_IMAGE_BUILD="${FORCE_IMAGE_BUILD:-0}"
readonly BUILD_APP_PATH="interop-testing/build/install/grpc-interop-testing"

#######################################
# Builds test app Docker images and pushes them to GCR
# Globals:
#   BUILD_APP_PATH
#   CLIENT_IMAGE_NAME: Test client Docker image name
#   GIT_COMMIT: SHA-1 of git commit being built
# Arguments:
#   None
# Outputs:
#   Writes the output of `gcloud builds submit` to stdout, stderr
#######################################
build_test_app_docker_images() {
  echo "Building C++ xDS interop test app Docker images"
  docker build -f "${SRC_DIR}/tools/dockerfile/interoptest/grpc_interop_cxx_xds/Dockerfile.xds_client" -t "${CLIENT_IMAGE_NAME}:${GIT_COMMIT}" "${SRC_DIR}"
  gcloud -q auth configure-docker
  docker push "${CLIENT_IMAGE_NAME}:${GIT_COMMIT}"
}

#######################################
# Builds test app and its docker images unless they already exist
# Globals:
#   CLIENT_IMAGE_NAME: Test client Docker image name
#   GIT_COMMIT: SHA-1 of git commit being built
#   FORCE_IMAGE_BUILD
# Arguments:
#   None
# Outputs:
#   Writes the output to stdout, stderr
#######################################
build_docker_images_if_needed() {
  # Check if images already exist
  client_tags="$(gcloud_gcr_list_image_tags "${CLIENT_IMAGE_NAME}" "${GIT_COMMIT}")"
  printf "Client image: %s:%s\n" "${CLIENT_IMAGE_NAME}" "${GIT_COMMIT}"
  echo "${client_tags:-Client image not found}"

  # Build if any of the images are missing, or FORCE_IMAGE_BUILD=1
  if [[ "${FORCE_IMAGE_BUILD}" == "1" || -z "${client_tags}" ]]; then
    build_test_app_docker_images
  else
    echo "Skipping C++ test app build"
  fi
}

#######################################
# Executes the test case
# Globals:
#   TEST_DRIVER_FLAGFILE: Relative path to test driver flagfile
#   KUBE_CONTEXT: The name of kubectl context with GKE cluster access
#   TEST_XML_OUTPUT_DIR: Output directory for the test xUnit XML report
#   CLIENT_IMAGE_NAME: Test client Docker image name
#   GIT_COMMIT: SHA-1 of git commit being built
# Arguments:
#   Test case name
# Outputs:
#   Writes the output of test execution to stdout, stderr
#   Test xUnit report to ${TEST_XML_OUTPUT_DIR}/${test_name}/sponge_log.xml
#######################################
run_test() {
  # Test driver usage:
  # https://github.com/grpc/grpc/tree/master/tools/run_tests/xds_k8s_test_driver#basic-usage
  local test_name="${1:?Usage: run_test test_name}"
  set -x
  python -m "tests.${test_name}" \
    --flagfile="${TEST_DRIVER_FLAGFILE}" \
    --kube_context="${KUBE_CONTEXT}" \
    --client_image="${CLIENT_IMAGE_NAME}:${GIT_COMMIT}" \
    --xml_output_file="${TEST_XML_OUTPUT_DIR}/${test_name}/sponge_log.xml" \
    --flagfile="config/url-map.cfg"
  set +x
}

#######################################
# Main function: provision software necessary to execute tests, and run them
# Globals:
#   KOKORO_ARTIFACTS_DIR
#   GITHUB_REPOSITORY_NAME
#   SRC_DIR: Populated with absolute path to the source repo
#   TEST_DRIVER_REPO_DIR: Populated with the path to the repo containing
#                         the test driver
#   TEST_DRIVER_FULL_DIR: Populated with the path to the test driver source code
#   TEST_DRIVER_FLAGFILE: Populated with relative path to test driver flagfile
#   TEST_XML_OUTPUT_DIR: Populated with the path to test xUnit XML report
#   GIT_ORIGIN_URL: Populated with the origin URL of git repo used for the build
#   GIT_COMMIT: Populated with the SHA-1 of git commit being built
#   GIT_COMMIT_SHORT: Populated with the short SHA-1 of git commit being built
#   KUBE_CONTEXT: Populated with name of kubectl context with GKE cluster access
# Arguments:
#   None
# Outputs:
#   Writes the output of test execution to stdout, stderr
#######################################
main() {
  local script_dir
  script_dir="$(dirname "$0")"
  # shellcheck source=tools/internal_ci/linux/grpc_xds_k8s_install_test_driver.sh
  source "${script_dir}/grpc_xds_k8s_install_test_driver.sh"
  set -x
  if [[ -n "${KOKORO_ARTIFACTS_DIR}" ]]; then
    kokoro_setup_test_driver "${GITHUB_REPOSITORY_NAME}"
  else
    local_setup_test_driver "${script_dir}"
  fi
  build_docker_images_if_needed
  # Run tests
  cd "${TEST_DRIVER_FULL_DIR}"
  run_test url_map
}

main "$@"