#!/usr/bin/env bash

# Copyright 2021 The Kubernetes 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 -o errexit
set -o nounset
set -o pipefail

KUBE_ROOT=$(dirname "${BASH_SOURCE[0]}")/../..
source "${KUBE_ROOT}/hack/lib/init.sh"
source "${KUBE_ROOT}/hack/lib/util.sh"

stability_check_setup() {
  kube::golang::verify_go_version
  kube::util::ensure-temp-dir
  cd "${KUBE_ROOT}"
  kube::golang::setup_env
}

function find_files_to_check() {
    # Similar to find but faster and easier to understand.  We want to include
    # modified and untracked files because this might be running against code
    # which is not tracked by git yet.
    git ls-files -cmo --exclude-standard \
        ':!:vendor/*'        `# catches vendor/...` \
        ':!:*/vendor/*'      `# catches any subdir/vendor/...` \
        ':!:third_party/*'   `# catches third_party/...` \
        ':!:*/third_party/*' `# catches third_party/...` \
        ':!:hack/*'          `# catches hack/...` \
        ':!:*/hack/*'        `# catches any subdir/hack/...` \
        ':!:*/*_test.go' \
        ':!:test/instrumentation' \
        ':(glob)**/*.go' \
        "$@"
}

function find_test_files() {
  git ls-files -cmo --exclude-standard \
      './test/instrumentation' \
      "$@"
}

red=$(tput setaf 1)
green=$(tput setaf 2)
reset=$(tput sgr0)

function kube::validate::stablemetrics() {
  stability_check_setup
  temp_file=$(mktemp)
  doValidate=$(find_files_to_check -z \
      | sort -z \
      | KUBE_ROOT=${KUBE_ROOT} xargs -0 -L 200 \
        go run \
            "test/instrumentation/main.go" \
            "test/instrumentation/decode_metric.go" \
            "test/instrumentation/find_stable_metric.go" \
            "test/instrumentation/error.go" \
            "test/instrumentation/metric.go" \
            -- \
            1>"${temp_file}")

  if $doValidate; then
    echo -e "${green}Diffing test/instrumentation/testdata/stable-metrics-list.yaml\n${reset}"
    if diff -u "$KUBE_ROOT/test/instrumentation/testdata/stable-metrics-list.yaml" "$temp_file"; then
      echo -e "${green}\nPASS metrics stability verification ${reset}"
      return 0
    fi
  fi

  echo "${red}!!! Metrics Stability static analysis has failed!${reset}" >&2
  echo "${red}!!! Please run ./hack/update-generated-stable-metrics.sh to update the golden list.${reset}" >&2
  exit 1
}

function kube::validate::test::stablemetrics() {
  stability_check_setup
  temp_file=$(mktemp)
  doValidate=$(find_test_files -z \
      | sort -z \
      | KUBE_ROOT=${KUBE_ROOT} xargs -0 -L 200 \
        go run \
            "test/instrumentation/main.go" \
            "test/instrumentation/decode_metric.go" \
            "test/instrumentation/find_stable_metric.go" \
            "test/instrumentation/error.go" \
            "test/instrumentation/metric.go" \
            -- \
            1>"${temp_file}")

  if $doValidate; then
    echo -e "${green}Diffing test/instrumentation/testdata/test-stable-metrics-list.yaml\n${reset}"
    if diff -u "$KUBE_ROOT/test/instrumentation/testdata/test-stable-metrics-list.yaml" "$temp_file"; then
      echo -e "${green}\nPASS metrics stability verification ${reset}"
      return 0
    fi
  fi

  echo "${red}!!! Metrics stability static analysis test has failed!${reset}" >&2
  echo "${red}!!! Please run './test/instrumentation/test-update.sh' to update the golden list.${reset}" >&2
  exit 1
}

function kube::update::stablemetrics() {
  stability_check_setup
  temp_file=$(mktemp)

  doCheckStability=$(find_files_to_check -z \
      | sort -z \
      | KUBE_ROOT=${KUBE_ROOT} xargs -0 -L 200 \
        go run \
            "test/instrumentation/main.go" \
            "test/instrumentation/decode_metric.go" \
            "test/instrumentation/find_stable_metric.go" \
            "test/instrumentation/error.go" \
            "test/instrumentation/metric.go" \
            -- \
            1>"${temp_file}")

  if ! $doCheckStability; then
    echo "${red}!!! updating golden list of metrics has failed! ${reset}" >&2
    exit 1
  fi
  mv -f "$temp_file" "${KUBE_ROOT}/test/instrumentation/testdata/stable-metrics-list.yaml"
  echo "${green}Updated golden list of stable metrics.${reset}"
}

function kube::update::documentation::list() {
  stability_check_setup
  temp_file=$(mktemp)
  doCheckStability=$(find_files_to_check -z \
      | sort -z \
      | KUBE_ROOT=${KUBE_ROOT} xargs -0 -L 200 \
        go run \
            "test/instrumentation/main.go" \
            "test/instrumentation/decode_metric.go" \
            "test/instrumentation/find_stable_metric.go" \
            "test/instrumentation/error.go" \
            "test/instrumentation/metric.go" \
            --allstabilityclasses \
            -- \
            1>"${temp_file}")

  if ! $doCheckStability; then
    echo "${red}!!! updating golden list of metrics has failed! ${reset}" >&2
    exit 1
  fi
  mv -f "$temp_file" "${KUBE_ROOT}/test/instrumentation/documentation/documentation-list.yaml"
  echo "${green}Updated list of metrics for documentation ${reset}"
}

function kube::update::documentation() {
  stability_check_setup
  temp_file=$(mktemp)
  arg1=$1
  arg2=$2
  doUpdateDocs=$(go run "test/instrumentation/documentation/main.go" --major "$arg1" --minor "$arg2" -- 1>"${temp_file}")
  if ! $doUpdateDocs; then
    echo "${red}!!! updating documentation has failed! ${reset}" >&2
    exit 1
  fi
  mv -f "$temp_file" "${KUBE_ROOT}/test/instrumentation/documentation/documentation.md"
  echo "${green}Updated documentation of metrics.${reset}"
}

function kube::update::test::stablemetrics() {
  stability_check_setup
  temp_file=$(mktemp)
  doCheckStability=$(find_test_files -z \
      | sort -z \
      | KUBE_ROOT=${KUBE_ROOT} xargs -0 -L 200 \
        go run \
            "test/instrumentation/main.go" \
            "test/instrumentation/decode_metric.go" \
            "test/instrumentation/find_stable_metric.go" \
            "test/instrumentation/error.go" \
            "test/instrumentation/metric.go" \
            -- \
            1>"${temp_file}")

  if ! $doCheckStability; then
    echo "${red}!!! updating golden list of test metrics has failed! ${reset}" >&2
    exit 1
  fi
  mv -f "$temp_file" "${KUBE_ROOT}/test/instrumentation/testdata/test-stable-metrics-list.yaml"
  echo "${green}Updated test list of stable metrics.${reset}"
}