# 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.

import fnmatch
import gzip
import os
from pathlib import Path

import click

from .command import Bash, Command, default_bin
from ..compat import _get_module
from .cmake import CMake
from .git import git
from .logger import logger
from ..lang.cpp import CppCMakeDefinition, CppConfiguration
from ..lang.python import Autopep8, Flake8, CythonLint, NumpyDoc, PythonCommand
from .rat import Rat, exclusion_from_globs
from .tmpdir import tmpdir


_archery_install_msg = (
    "Please install archery using: `pip install -e dev/archery[lint]`. "
)


class LintValidationException(Exception):
    pass


class LintResult:
    def __init__(self, success, reason=None):
        self.success = success

    def ok(self):
        if not self.success:
            raise LintValidationException

    @staticmethod
    def from_cmd(command_result):
        return LintResult(command_result.returncode == 0)


def cpp_linter(src, build_dir, clang_format=True, cpplint=True,
               clang_tidy=False, iwyu=False, iwyu_all=False,
               fix=False):
    """ Run clang-format, cpplint and clang-tidy on cpp/ codebase. """
    logger.info("Running C++ linters")

    cmake = CMake()
    if not cmake.available:
        logger.error("cpp linter requested but cmake binary not found.")
        return

    # A cmake build directory is required to populate `compile_commands.json`
    # which in turn is required by clang-tidy. It also provides a convenient
    # way to hide clang-format/clang-tidy invocation via the Generate
    # (ninja/make) targets.

    # ARROW_LINT_ONLY exits early but ignore building compile_command.json
    lint_only = not (iwyu or clang_tidy)
    cmake_args = {"with_python": False, "with_lint_only": lint_only}
    cmake_def = CppCMakeDefinition(src.cpp, CppConfiguration(**cmake_args))

    build = cmake_def.build(build_dir)
    if clang_format:
        target = "format" if fix else "check-format"
        yield LintResult.from_cmd(build.run(target, check=False))

    if cpplint:
        yield LintResult.from_cmd(build.run("lint", check=False))
        yield LintResult.from_cmd(build.run("lint_cpp_cli", check=False))

    if clang_tidy:
        yield LintResult.from_cmd(build.run("check-clang-tidy", check=False))

    if iwyu:
        if iwyu_all:
            iwyu_cmd = "iwyu-all"
        else:
            iwyu_cmd = "iwyu"
        yield LintResult.from_cmd(build.run(iwyu_cmd, check=False))


class CMakeFormat(Command):

    def __init__(self, paths, cmake_format_bin=None):
        self.check_version()
        self.bin = default_bin(cmake_format_bin, "cmake-format")
        self.paths = paths

    @classmethod
    def from_patterns(cls, base_path, include_patterns, exclude_patterns):
        paths = {
            str(path.as_posix())
            for pattern in include_patterns
            for path in base_path.glob(pattern)
        }
        for pattern in exclude_patterns:
            pattern = (base_path / pattern).as_posix()
            paths -= set(fnmatch.filter(paths, str(pattern)))
        return cls(paths)

    @staticmethod
    def check_version():
        try:
            # cmake_format is part of the cmakelang package
            import cmakelang
        except ImportError:
            raise ImportError(

            )
        # pin a specific version of cmake_format, must be updated in setup.py
        if cmakelang.__version__ != "0.6.13":
            raise LintValidationException(
                f"Wrong version of cmake_format is detected. "
                f"{_archery_install_msg}"
            )

    def check(self):
        return self.run("-l", "error", "--check", *self.paths, check=False)

    def fix(self):
        return self.run("--in-place", *self.paths, check=False)


def cmake_linter(src, fix=False):
    """
    Run cmake-format on all CMakeFiles.txt
    """
    logger.info("Running cmake-format linters")

    cmake_format = CMakeFormat.from_patterns(
        src.path,
        include_patterns=[
            'ci/**/*.cmake',
            'cpp/CMakeLists.txt',
            'cpp/src/**/*.cmake.in',
            'cpp/src/**/CMakeLists.txt',
            'cpp/examples/**/CMakeLists.txt',
            'cpp/cmake_modules/*.cmake',
            'go/**/CMakeLists.txt',
            'java/**/CMakeLists.txt',
            'matlab/**/CMakeLists.txt',
            'python/CMakeLists.txt',
        ],
        exclude_patterns=[
            'cpp/cmake_modules/FindNumPy.cmake',
            'cpp/cmake_modules/FindPythonLibsNew.cmake',
            'cpp/cmake_modules/UseCython.cmake',
            'cpp/src/arrow/util/config.h.cmake',
        ]
    )
    method = cmake_format.fix if fix else cmake_format.check

    yield LintResult.from_cmd(method())


def python_linter(src, fix=False):
    """Run Python linters on python/pyarrow, python/examples, setup.py
    and dev/. """
    setup_py = os.path.join(src.python, "setup.py")
    setup_cfg = os.path.join(src.python, "setup.cfg")

    logger.info("Running Python formatter (autopep8)")

    autopep8 = Autopep8()
    if not autopep8.available:
        logger.error(
            "Python formatter requested but autopep8 binary not found. "
            f"{_archery_install_msg}")
        return

    # Gather files for autopep8
    patterns = ["python/pyarrow/**/*.py",
                "python/pyarrow/**/*.pyx",
                "python/pyarrow/**/*.pxd",
                "python/pyarrow/**/*.pxi",
                "python/examples/**/*.py",
                "dev/*.py",
                "dev/archery/**/*.py",
                "dev/release/**/*.py"]
    files = [setup_py]
    for pattern in patterns:
        files += list(map(str, Path(src.path).glob(pattern)))

    args = ['--global-config', setup_cfg, '--ignore-local-config']
    if fix:
        args += ['-j0', '--in-place']
        args += sorted(files)
        yield LintResult.from_cmd(autopep8(*args))
    else:
        # XXX `-j0` doesn't work well with `--exit-code`, so instead
        # we capture the diff and check whether it's empty
        # (https://github.com/hhatto/autopep8/issues/543)
        args += ['-j0', '--diff']
        args += sorted(files)
        diff = autopep8.run_captured(*args)
        if diff:
            print(diff.decode('utf8'))
            yield LintResult(success=False)
        else:
            yield LintResult(success=True)

    # Run flake8 after autopep8 (the latter may have modified some files)
    logger.info("Running Python linter (flake8)")

    flake8 = Flake8()
    if not flake8.available:
        logger.error(
            "Python linter requested but flake8 binary not found. "
            f"{_archery_install_msg}")
        return

    flake8_exclude = ['.venv*', 'vendored']

    yield LintResult.from_cmd(
        flake8("--extend-exclude=" + ','.join(flake8_exclude),
               "--config=" + os.path.join(src.python, "setup.cfg"),
               setup_py, src.pyarrow, os.path.join(src.python, "examples"),
               src.dev, check=False))

    logger.info("Running Cython linter (cython-lint)")

    cython_lint = CythonLint()
    if not cython_lint.available:
        logger.error(
            "Cython linter requested but cython-lint binary not found. "
            f"{_archery_install_msg}")
        return

    # Gather files for cython-lint
    patterns = ["python/pyarrow/**/*.pyx",
                "python/pyarrow/**/*.pxd",
                "python/pyarrow/**/*.pxi",
                "python/examples/**/*.pyx",
                "python/examples/**/*.pxd",
                "python/examples/**/*.pxi",
                ]
    files = []
    for pattern in patterns:
        files += list(map(str, Path(src.path).glob(pattern)))
    args = ['--no-pycodestyle']
    args += sorted(files)
    yield LintResult.from_cmd(cython_lint(*args))


def python_cpp_linter(src, clang_format=True, fix=False):
    """Run C++ linters on python/pyarrow/src/arrow/python."""
    cpp_src = os.path.join(src.python, "pyarrow", "src", "arrow", "python")

    python = PythonCommand()

    if clang_format:
        logger.info("Running clang-format for python/pyarrow/src/arrow/python")

        if "CLANG_TOOLS_PATH" in os.environ:
            clang_format_binary = os.path.join(
                os.environ["CLANG_TOOLS_PATH"], "clang-format")
        else:
            clang_format_binary = "clang-format-14"

        run_clang_format = os.path.join(src.cpp, "build-support",
                                        "run_clang_format.py")
        args = [run_clang_format, "--source_dir", cpp_src,
                "--clang_format_binary", clang_format_binary]
        if fix:
            args += ["--fix"]

        yield LintResult.from_cmd(python.run(*args))


def python_numpydoc(symbols=None, allow_rules=None, disallow_rules=None):
    """Run numpydoc linter on python.

    Pyarrow must be available for import.
    """
    logger.info("Running Python docstring linters")
    # by default try to run on all pyarrow package
    symbols = symbols or {
        'pyarrow',
        'pyarrow.compute',
        'pyarrow.csv',
        'pyarrow.dataset',
        'pyarrow.feather',
        # 'pyarrow.flight',
        'pyarrow.fs',
        'pyarrow.gandiva',
        'pyarrow.ipc',
        'pyarrow.json',
        'pyarrow.orc',
        'pyarrow.parquet',
        'pyarrow.types',
    }
    try:
        numpydoc = NumpyDoc(symbols)
    except RuntimeError as e:
        logger.error(str(e))
        yield LintResult(success=False)
        return

    results = numpydoc.validate(
        # limit the validation scope to the pyarrow package
        from_package='pyarrow',
        allow_rules=allow_rules,
        disallow_rules=disallow_rules
    )

    if len(results) == 0:
        yield LintResult(success=True)
        return

    number_of_violations = 0
    for obj, result in results:
        errors = result['errors']

        # inspect doesn't play nice with cython generated source code,
        # to use a hacky way to represent a proper __qualname__
        doc = getattr(obj, '__doc__', '')
        name = getattr(obj, '__name__', '')
        qualname = getattr(obj, '__qualname__', '')
        module = _get_module(obj, default='')
        instance = getattr(obj, '__self__', '')
        if instance:
            klass = instance.__class__.__name__
        else:
            klass = ''

        try:
            cython_signature = doc.splitlines()[0]
        except Exception:
            cython_signature = ''

        desc = '.'.join(filter(None, [module, klass, qualname or name]))

        click.echo()
        click.echo(click.style(desc, bold=True, fg='yellow'))
        if cython_signature:
            qualname_with_signature = '.'.join([module, cython_signature])
            click.echo(
                click.style(
                    '-> {}'.format(qualname_with_signature),
                    fg='yellow'
                )
            )

        for error in errors:
            number_of_violations += 1
            click.echo('{}: {}'.format(*error))

    msg = 'Total number of docstring violations: {}'.format(
        number_of_violations
    )
    click.echo()
    click.echo(click.style(msg, fg='red'))

    yield LintResult(success=False)


def rat_linter(src, root):
    """Run apache-rat license linter."""
    logger.info("Running apache-rat linter")

    if src.git_dirty:
        logger.warn("Due to the usage of git-archive, uncommitted files will"
                    " not be checked for rat violations. ")

    exclusion = exclusion_from_globs(
        os.path.join(src.dev, "release", "rat_exclude_files.txt"))

    # Creates a git-archive of ArrowSources, apache-rat expects a gzip
    # compressed tar archive.
    archive_path = os.path.join(root, "apache-arrow.tar.gz")
    src.archive(archive_path, compressor=gzip.compress)
    report = Rat().report(archive_path)

    violations = list(report.validate(exclusion=exclusion))
    for violation in violations:
        print("apache-rat license violation: {}".format(violation))

    yield LintResult(len(violations) == 0)


def r_linter(src):
    """Run R linter."""
    logger.info("Running R linter")
    r_lint_sh = os.path.join(src.r, "lint.sh")
    yield LintResult.from_cmd(Bash().run(r_lint_sh, check=False))


class Hadolint(Command):
    def __init__(self, hadolint_bin=None):
        self.bin = default_bin(hadolint_bin, "hadolint")


def is_docker_image(path):
    dirname = os.path.dirname(path)
    filename = os.path.basename(path)

    excluded = dirname.startswith(
        "dev") or dirname.startswith("python/manylinux")

    return filename.startswith("Dockerfile") and not excluded


def docker_linter(src):
    """Run Hadolint docker linter."""
    logger.info("Running Docker linter")

    hadolint = Hadolint()

    if not hadolint.available:
        logger.error(
            "hadolint linter requested but hadolint binary not found.")
        return

    for path in git.ls_files(git_dir=src.path):
        if is_docker_image(path):
            yield LintResult.from_cmd(hadolint.run(path, check=False,
                                                   cwd=src.path))


def linter(src, fix=False, *, clang_format=False, cpplint=False,
           clang_tidy=False, iwyu=False, iwyu_all=False,
           python=False, numpydoc=False, cmake_format=False, rat=False,
           r=False, docker=False):
    """Run all linters."""
    with tmpdir(prefix="arrow-lint-") as root:
        build_dir = os.path.join(root, "cpp-build")

        # Linters yield LintResult without raising exceptions on failure.
        # This allows running all linters in one pass and exposing all
        # errors to the user.
        results = []

        if clang_format or cpplint or clang_tidy or iwyu:
            results.extend(cpp_linter(src, build_dir,
                                      clang_format=clang_format,
                                      cpplint=cpplint,
                                      clang_tidy=clang_tidy,
                                      iwyu=iwyu,
                                      iwyu_all=iwyu_all,
                                      fix=fix))

        if python:
            results.extend(python_linter(src, fix=fix))

        if python and clang_format:
            results.extend(python_cpp_linter(src,
                                             clang_format=clang_format,
                                             fix=fix))

        if numpydoc:
            results.extend(python_numpydoc())

        if cmake_format:
            results.extend(cmake_linter(src, fix=fix))

        if rat:
            results.extend(rat_linter(src, root))

        if r:
            results.extend(r_linter(src))

        if docker:
            results.extend(docker_linter(src))

        # Raise error if one linter failed, ensuring calling code can exit with
        # non-zero.
        for result in results:
            result.ok()
