#!/usr/bin/env bash
#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You 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.
#
# define test binaries + versions
FLAKE8_BUILD="flake8"
MINIMUM_FLAKE8="3.9.0"
MINIMUM_MYPY="1.8.0"
MYPY_BUILD="mypy"
PYTEST_BUILD="pytest"

PYTHON_EXECUTABLE="${PYTHON_EXECUTABLE:-python3}"

BLACK_BUILD="$PYTHON_EXECUTABLE -m black"

function exit_with_usage {
  set +x
  echo "lint-python - linter for Python"
  echo ""
  echo "usage:"
  cl_options="[--compile] [--black] [--custom-pyspark-error] [--flake8] [--mypy] [--mypy-examples] [--mypy-data]"
  echo "lint-python $cl_options"
  echo ""
  exit 1
}

# Parse arguments
while (( "$#" )); do
  case $1 in
    --compile)
      COMPILE_TEST=true
      ;;
    --black)
      BLACK_TEST=true
      ;;
    --custom-pyspark-error)
      PYSPARK_CUSTOM_ERRORS_CHECK_TEST=true
      ;;
    --flake8)
      FLAKE8_TEST=true
      ;;
    --mypy)
      MYPY_TEST=true
      ;;
    --mypy-examples)
      MYPY_EXAMPLES_TEST=true
      ;;
    --mypy-data)
      MYPY_DATA_TEST=true
      ;;
    *)
      echo "Error: $1 is not supported"
      exit_with_usage
      ;;
  esac
  shift
done

if [[ -z "$COMPILE_TEST$BLACK_TEST$PYSPARK_CUSTOM_ERRORS_CHECK_TEST$FLAKE8_TEST$MYPY_TEST$MYPY_EXAMPLES_TEST$MYPY_DATA_TEST" ]]; then
  COMPILE_TEST=true
  BLACK_TEST=true
  PYSPARK_CUSTOM_ERRORS_CHECK_TEST=true
  FLAKE8_TEST=true
  MYPY_TEST=true
  MYPY_EXAMPLES_TEST=true
  MYPY_DATA_TEST=true
fi

function satisfies_min_version {
    local provided_version="$1"
    local expected_version="$2"
    echo "$(
        "$PYTHON_EXECUTABLE" << EOM
try:
    from setuptools.extern.packaging import version
except ModuleNotFoundError:
    from packaging import version
print(version.parse('$provided_version') >= version.parse('$expected_version'))
EOM
    )"
}

function compile_python_test {
    local COMPILE_STATUS=
    local COMPILE_REPORT=

    if [[ ! "$1" ]]; then
        echo "No python files found!  Something is very wrong -- exiting."
        exit 1;
    fi

    # compileall: https://docs.python.org/3/library/compileall.html
    echo "starting python compilation test..."
    COMPILE_REPORT=$( ("$PYTHON_EXECUTABLE" -B -mcompileall -q -l -x "[/\\\\][.]git" $1) 2>&1)
    COMPILE_STATUS=$?

    if [ $COMPILE_STATUS -ne 0 ]; then
        echo "Python compilation failed with the following errors:"
        echo "$COMPILE_REPORT"
        echo "$COMPILE_STATUS"
        exit "$COMPILE_STATUS"
    else
        echo "python compilation succeeded."
        echo
    fi
}


function mypy_annotation_test {
    local MYPY_REPORT=
    local MYPY_STATUS=

    echo "starting mypy annotations test..."
    MYPY_REPORT=$( ($MYPY_BUILD \
      --python-executable $PYTHON_EXECUTABLE \
      --namespace-packages \
      --config-file python/mypy.ini \
      --cache-dir /tmp/.mypy_cache/ \
      python/pyspark) 2>&1)
    MYPY_STATUS=$?

    if [ "$MYPY_STATUS" -ne 0 ]; then
        echo "annotations failed mypy checks:"
        echo "$MYPY_REPORT"
        echo "$MYPY_STATUS"
        exit "$MYPY_STATUS"
    else
        echo "annotations passed mypy checks."
        echo
    fi
}


function mypy_data_test {
    local PYTEST_REPORT=
    local PYTEST_STATUS=

    echo "starting mypy data test..."

    $PYTHON_EXECUTABLE -c "import importlib.util; import sys; \
               sys.exit(0 if importlib.util.find_spec('pytest_mypy_plugins') else 1)"

    if [ $? -ne 0 ]; then
      echo "pytest-mypy-plugins missing. Skipping for now."
      return
    fi

    PYTEST_REPORT=$( (MYPYPATH=python $PYTEST_BUILD \
      -c dev/pyproject.toml \
      --rootdir python \
      --mypy-only-local-stub \
      --mypy-ini-file python/mypy.ini \
      python/pyspark ) 2>&1)

    PYTEST_STATUS=$?

    if [ "$PYTEST_STATUS" -ne 0 ]; then
        echo "annotations failed data checks:"
        echo "$PYTEST_REPORT"
        echo "$PYTEST_STATUS"
        exit "$PYTEST_STATUS"
    else
      echo "annotations passed data checks."
      echo
    fi
}

function mypy_examples_test {
    local MYPY_REPORT=
    local MYPY_STATUS=

    echo "starting mypy examples test..."

    MYPY_REPORT=$( (MYPYPATH=python $MYPY_BUILD \
      --python-executable $PYTHON_EXECUTABLE \
      --namespace-packages \
      --config-file python/mypy.ini \
      --exclude "mllib/*" \
      examples/src/main/python/) 2>&1)

    MYPY_STATUS=$?

    if [ "$MYPY_STATUS" -ne 0 ]; then
        echo "examples failed mypy checks:"
        echo "$MYPY_REPORT"
        echo "$MYPY_STATUS"
        exit "$MYPY_STATUS"
    else
      echo "examples passed mypy checks."
      echo
    fi
}


function mypy_test {
    if ! hash "$MYPY_BUILD" 2> /dev/null; then
        echo "The $MYPY_BUILD command was not found. Skipping for now."
        return
    fi

    _MYPY_VERSION=($($MYPY_BUILD --version))
    MYPY_VERSION="${_MYPY_VERSION[1]}"
    EXPECTED_MYPY="$(satisfies_min_version $MYPY_VERSION $MINIMUM_MYPY)"

    if [[ "$EXPECTED_MYPY" == "False" ]]; then
        echo "The minimum mypy version needs to be $MINIMUM_MYPY. Your current version is $MYPY_VERSION. Skipping for now."
        return
    fi

    if [[ "$MYPY_TEST" == "true" ]]; then
        mypy_annotation_test
    fi
    if [[ "$MYPY_EXAMPLES_TEST" == "true" ]]; then
        mypy_examples_test
    fi
    if [[ "$MYPY_DATA_TEST" == "true" ]]; then
        mypy_data_test
    fi
}


function flake8_test {
    local FLAKE8_VERSION=
    local EXPECTED_FLAKE8=
    local FLAKE8_REPORT=
    local FLAKE8_STATUS=

    if ! hash "$FLAKE8_BUILD" 2> /dev/null; then
        echo "The flake8 command was not found. Skipping for now."
        return
    fi

    _FLAKE8_VERSION=($($FLAKE8_BUILD --version))
    FLAKE8_VERSION="${_FLAKE8_VERSION[0]}"
    EXPECTED_FLAKE8="$(satisfies_min_version $FLAKE8_VERSION $MINIMUM_FLAKE8)"

    if [[ "$EXPECTED_FLAKE8" == "False" ]]; then
        echo "\
The minimum flake8 version needs to be $MINIMUM_FLAKE8. Your current version is $FLAKE8_VERSION

flake8 checks failed."
        exit 1
    fi

    echo "starting $FLAKE8_BUILD test..."
    FLAKE8_REPORT=$( ($FLAKE8_BUILD --append-config dev/tox.ini --count --show-source --statistics .) 2>&1)
    FLAKE8_STATUS=$?

    if [ "$FLAKE8_STATUS" -ne 0 ]; then
        echo "flake8 checks failed:"
        echo "$FLAKE8_REPORT"
        echo "$FLAKE8_STATUS"
        exit "$FLAKE8_STATUS"
    else
        echo "flake8 checks passed."
        echo
    fi
}

function black_test {
    local BLACK_REPORT=
    local BLACK_STATUS=

    # Skip check if black is not installed.
    $PYTHON_EXECUTABLE -c 'import black' &> /dev/null
    if [ $? -ne 0 ]; then
        echo "The Python library providing 'black' module was not found. Skipping black checks for now."
        echo
        return
    fi

    echo "starting black test..."
    BLACK_REPORT=$( ($BLACK_BUILD  --config dev/pyproject.toml --check python/pyspark dev python/packaging) 2>&1)
    BLACK_STATUS=$?

    if [ "$BLACK_STATUS" -ne 0 ]; then
        echo "black checks failed:"
        echo "$BLACK_REPORT"
        echo "Please run 'dev/reformat-python' script."
        echo "$BLACK_STATUS"
        exit "$BLACK_STATUS"
    else
        echo "black checks passed."
        echo
    fi
}

function pyspark_custom_errors_check_test {
    local PYSPARK_CUSTOM_ERRORS_CHECK_REPORT=
    local PYSPARK_CUSTOM_ERRORS_CHECK_STATUS=

    echo "starting PySpark custom errors check..."
    PYSPARK_CUSTOM_ERRORS_CHECK_REPORT=$( "$PYTHON_EXECUTABLE" dev/check_pyspark_custom_errors.py 2>&1 )
    PYSPARK_CUSTOM_ERRORS_CHECK_STATUS=$?

    if [ "$PYSPARK_CUSTOM_ERRORS_CHECK_STATUS" -ne 0 ]; then
        echo "PySpark custom errors check failed!"
        echo "$PYSPARK_CUSTOM_ERRORS_CHECK_REPORT"
        exit "$PYSPARK_CUSTOM_ERRORS_CHECK_STATUS"
    else
        echo "PySpark custom errors check passed."
        echo
    fi
}

SCRIPT_DIR="$( cd "$( dirname "$0" )" && pwd )"
SPARK_ROOT_DIR="$(dirname "${SCRIPT_DIR}")"

pushd "$SPARK_ROOT_DIR" &> /dev/null

PYTHON_SOURCE="$(git ls-files '*.py')"

if [[ "$COMPILE_TEST" == "true" ]]; then
    compile_python_test "$PYTHON_SOURCE"
fi
if [[ "$BLACK_TEST" == "true" ]]; then
    black_test
fi
if [[ "$PYSPARK_CUSTOM_ERRORS_CHECK_TEST" == "true" ]]; then
    pyspark_custom_errors_check_test
fi
if [[ "$FLAKE8_TEST" == "true" ]]; then
    flake8_test
fi
if [[ "$MYPY_TEST" == "true" ]] || [[ "$MYPY_EXAMPLES_TEST" == "true" ]] || [[ "$MYPY_DATA_TEST" == "true" ]]; then
    mypy_test
fi

echo
echo "all lint-python tests passed!"

popd &> /dev/null