#!/usr/bin/env bash
# Copyright 2018 The Go Cloud Development Kit 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
#
#     https://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.

# This script runs all checks for Go CDK, including go test suites,
# compatibility checks, consistency checks, Wire, etc.

# https://coderwall.com/p/fkfaqq/safer-bash-scripts-with-set-euxo-pipefail
# Change to -euxo if debugging.
set -euo pipefail

if [[ $# -gt 0 ]]; then
  echo "usage: runchecks.sh" 1>&2
  exit 64
fi

# start_local_deps.sh requires that Docker is installed,
# which is only supported on Linux.
# Tests that depend on them should check the RUNNER_OS environment before running.
# Don't do this when running locally, as it's slow; user should do it.
if [[ "${RUNNER_OS:-}" == "Linux" ]]; then
  echo
  echo "Starting local dependencies..."
  ./internal/testing/start_local_deps.sh
else
  echo "Not starting local dependencies for ${RUNNER_OS:-}."
fi

result=0
rootdir="$(pwd)"

# Update the regexp below when upgrading to a
# new Go version. Some checks below we only run
# for the latest Go version.
latest_go_version=0
if [[ $(go version) == *go1\.19* ]]; then
  latest_go_version=1
fi

# Build the test-summary app, which is used inside the loop to summarize results
# from Go tests.
(cd internal/testing/test-summary && go build)
while read -r path || [[ -n "$path" ]]; do
  echo
  echo "******************************"
  echo "* Running Go tests for module: $path"
  echo "******************************"
  echo

  # TODO(rvangent): Special case modules to skip for Windows. Perhaps
  # this should be data-driven by allmodules?
  # (https://github.com/google/go-cloud/issues/2111).
  if [[ "${RUNNER_OS:-}" == "Windows" ]] && [[ "$path" == "internal/website" ]]; then
    echo "  Skipping on Windows"
    continue
  fi

  gotestflags=("-json" "-race")
  testsummaryflags=("-progress")

  if [[ $latest_go_version -eq 1 ]]; then
    # Only do coverage for the latest Linux build because it is slow, and
    # codecov will only save the last one anyway.
    if [[ "${RUNNER_OS:-}" == "Linux" ]]; then
      gotestflags+=("-coverpkg=./..." "-coverprofile=$rootdir/modcoverage.out")
    fi
    # Previous versions of the "go" command may have
    # different opinions about what go.mod should look
    # like.
    gotestflags+=("-mod=readonly")
  fi

  # Run the tests.
  (cd "$path" && go test "${gotestflags[@]}" ./...) | ./internal/testing/test-summary/test-summary "${testsummaryflags[@]}" || result=1
  if [ -f modcoverage.out ] && [ $result -eq 0 ]; then
    cat modcoverage.out >> coverage.out
    rm modcoverage.out
  fi
done < <( sed -e '/^#/d' -e '/^$/d' allmodules | awk '{print $1}' )
# The above filters out comments and empty lines from allmodules and only takes
# the first (whitespace-separated) field from each line.

# Upload cumulative coverage data if we generated it.
if [ -f coverage.out ] && [ $result -eq 0 ]; then
  # Filter out test packages.
  grep -v test coverage.out > coverage2.out
  mv coverage2.out coverage.out
  bash <(curl -s https://codecov.io/bash)
  rm coverage.out
fi

# The rest of these checks are not OS-specific, so we only run them for the
# Linux build, or when running locally.
if [[ "${RUNNER_OS:-linux}" != "Linux" ]]; then
  exit $result
fi

if [[ ${latest_go_version} -eq 1 ]]; then
  echo
  echo "************************"
  echo "* Checking go mod tidy"
  echo "************************"
  echo
  while read -r path || [[ -n "$path" ]]; do
    echo "Module: $path"
    ( cd "$path" && "$rootdir"/internal/testing/check_mod_tidy.sh && echo "  OK" ) || { echo "FAIL: please run ./internal/testing/gomodcleanup.sh" && result=1; }
  done < <( sed -e '/^#/d' -e '/^$/d' allmodules | awk '{print $1}' )
  # The above filters out comments and empty lines from allmodules and only takes
  # the first (whitespace-separated) field from each line.
fi


if [[ ${latest_go_version} -eq 1 ]]; then
  echo
  echo "**********************"
  echo "* Checking wire diff"
  echo "**********************"
  echo
  echo "Installing Wire..."
  go install github.com/google/wire/cmd/wire@latest
  echo
  while read -r path || [[ -n "$path" ]]; do
    echo "Module: $path"
    ( cd "$path" && wire diff ./... && echo "  OK" ) || { echo "FAIL: wire diff found diffs!" && result=1; }
  done < <( sed -e '/^#/d' -e '/^$/d' allmodules | awk '{print $1}' )
  # The above filters out comments and empty lines from allmodules and only takes
  # the first (whitespace-separated) field from each line.
fi;

if [[ ${latest_go_version} -eq 1 ]]; then
  echo
  echo "******************************"
  echo "* Doing non-module checks"
  echo "******************************"
  echo
  echo "Ensuring .go files are formatted with gofmt -s..."
  DIFF="$(gofmt -s -d .)"
  if [ -n "$DIFF" ]; then
    echo "FAIL: please run 'gofmt -s -w .' and commit the result"
    echo "$DIFF";
    exit 1;
  else
    echo "  OK"
  fi;
fi;

if [[ ${latest_go_version} -eq 1 ]]; then
  echo
  echo "Ensuring that there are no dependencies not listed in ./internal/testing/alldeps..."
  ( ./internal/testing/listdeps.sh | diff -u ./internal/testing/alldeps - && echo "  OK" ) || {
    echo "FAIL: dependencies changed; run: internal/testing/listdeps.sh > internal/testing/alldeps" && result=1
    # Module behavior may differ across versions.
    echo "using the most recent go version."
  }
fi


if [[ ${latest_go_version} -eq 1 ]]; then
  echo
  echo "Ensuring that any new packages have the corresponding entries in Hugo..."
  missing_packages="$(internal/website/listnewpkgs.sh)"
  if ! [[ -z "$missing_packages" ]]; then
    echo "FAIL: missing package meta tags for:" 1>&2
    echo "$missing_packages" 1>&2
    result=1
  else
    echo "  OK"
  fi

  echo
  echo "Ensuring that all examples used in Hugo match what's in source..."
  (internal/website/gatherexamples/run.sh | diff -u internal/website/data/examples.json - > /dev/null && echo "  OK") || {
    echo "FAIL: examples changed; run: internal/website/gatherexamples/run.sh > internal/website/data/examples.json"
    result=1
  }
fi;


# For pull requests, check if there are undeclared incompatible API changes.
# Skip this if we're already going to fail since it is expensive.
# CURRENTLY BROKEN
# if [[ ${latest_go_version} -eq 1 ]] && [[ ${result} -eq 0 ]] && [[ ! -z "${GITHUB_HEAD_REF:-}" ]]; then
  # echo
  # ./internal/testing/check_api_change.sh || result=1;
# fi


echo
if [[ ${result} -eq 0 ]]; then
  echo "SUCCESS!"
else
  echo "FAILED; see above for more info."
fi

exit $result