# -----------------------------------------------------------------------------
# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License. See License.txt in the project root for
# license information.
# -----------------------------------------------------------------------------

from glob import glob
import multiprocessing
import os
import sys

from knack.log import get_logger
from knack.util import CLIError, CommandResultItem

from azdev.utilities import (
    display, heading, py_cmd, get_path_table, EXTENSION_PREFIX,
    get_azdev_config, get_azdev_config_dir, require_azure_cli, filter_by_git_diff)


logger = get_logger(__name__)


# pylint: disable=too-many-statements
def check_style(modules=None, pylint=False, pep8=False, git_source=None, git_target=None, git_repo=None):

    heading('Style Check')

    # allow user to run only on CLI or extensions
    cli_only = modules == ['CLI']
    ext_only = modules == ['EXT']
    if cli_only or ext_only:
        modules = None

    selected_modules = get_path_table(include_only=modules)

    # remove these two non-modules
    selected_modules['core'].pop('azure-cli-nspkg', None)
    selected_modules['core'].pop('azure-cli-command_modules-nspkg', None)

    pep8_result = None
    pylint_result = None

    if pylint:
        try:
            require_azure_cli()
        except CLIError:
            raise CLIError('usage error: --pylint requires Azure CLI to be installed.')

    if cli_only:
        ext_names = None
        selected_modules['ext'] = {}
    if ext_only:
        mod_names = None
        selected_modules['mod'] = {}
        selected_modules['core'] = {}

    # filter down to only modules that have changed based on git diff
    selected_modules = filter_by_git_diff(selected_modules, git_source, git_target, git_repo)

    if not any(selected_modules.values()):
        raise CLIError('No modules selected.')

    mod_names = list(selected_modules['mod'].keys()) + list(selected_modules['core'].keys())
    ext_names = list(selected_modules['ext'].keys())

    if mod_names:
        display('Modules: {}\n'.format(', '.join(mod_names)))
    if ext_names:
        display('Extensions: {}\n'.format(', '.join(ext_names)))

    # if neither flag provided, same as if both were provided
    if not any([pylint, pep8]):
        pep8 = True
        pylint = True

    exit_code_sum = 0

    if pylint:
        pylint_result = run_pylint(selected_modules)
        exit_code_sum += pylint_result.exit_code

        if pylint_result.error:
            display('Pylint: PASSED')
            logger.error(pylint_result.error.output.decode('utf-8'))
            logger.error('Pylint: FAILED\n')
        else:
            display('Pylint: PASSED\n')

    if pep8:
        pep8_result = _run_pep8(selected_modules)
        exit_code_sum += pep8_result.exit_code

        if pep8_result.error:
            logger.error(pep8_result.error.output.decode('utf-8'))
            logger.error('Flake8: FAILED\n')
        else:
            display('Flake8: PASSED\n')

    sys.exit(exit_code_sum)


def _combine_command_result(cli_result, ext_result):

    final_result = CommandResultItem(None)

    def apply_result(item):
        if item:
            final_result.exit_code += item.exit_code
            if item.error:
                if final_result.error:
                    try:
                        final_result.error.message += item.error.message
                    except AttributeError:
                        final_result.error.message += str(item.error)
                else:
                    final_result.error = item.error
                    setattr(final_result.error, 'message', '')
            if item.result:
                if final_result.result:
                    final_result.result += item.result
                else:
                    final_result.result = item.result

    apply_result(cli_result)
    apply_result(ext_result)
    return final_result


def run_pylint(modules, checkers=None, env=None, disable_all=False, enable=None):
    def get_core_module_paths(modules):
        core_paths = []
        for p in modules["core"].values():
            _, tail = os.path.split(p)
            for x in str(tail).split("-"):
                p = os.path.join(p, x)
            core_paths.append(p)
        return core_paths

    cli_paths = get_core_module_paths(modules) + list(modules["mod"].values())

    ext_paths = []
    for path in list(modules["ext"].values()):
        glob_pattern = os.path.normcase(os.path.join("{}*".format(EXTENSION_PREFIX)))
        ext_paths.append(glob(os.path.join(path, glob_pattern))[0])

    def run(paths, rcfile, desc, checkers=None, env=None, disable_all=False, enable=None):
        if not paths:
            return None
        logger.debug("Using rcfile file: %s", rcfile)
        logger.debug("Running on %s: %s", desc, "\n".join(paths))
        command = "pylint {} --rcfile={} --jobs {}".format(
            " ".join(paths), rcfile, multiprocessing.cpu_count()
        )
        if checkers is not None:
            command += ' --load-plugins {}'.format(",".join(checkers))
        if disable_all:
            command += ' --disable=all'
        if enable is not None:
            command += ' --enable {}'.format(",".join(enable))

        return py_cmd(command, message="Running pylint on {}...".format(desc), env=env)

    cli_pylintrc, ext_pylintrc = _config_file_path("pylint")

    cli_result = run(cli_paths, cli_pylintrc, "modules",
                     checkers=checkers, env=env, disable_all=disable_all, enable=enable)
    ext_result = run(ext_paths, ext_pylintrc, "extensions",
                     checkers=checkers, env=env, disable_all=disable_all, enable=enable)
    return _combine_command_result(cli_result, ext_result)


def _run_pep8(modules):

    cli_paths = list(modules["core"].values()) + list(modules["mod"].values())
    ext_paths = list(modules["ext"].values())

    def run(paths, rcfile, desc):
        if not paths:
            return None
        logger.debug("Using config file: %s", rcfile)
        logger.debug("Running on %s:\n%s", desc, "\n".join(paths))
        command = "flake8 --statistics --append-config={} {}".format(
            rcfile, " ".join(paths)
        )
        return py_cmd(command, message="Running flake8 on {}...".format(desc))

    cli_config, ext_config = _config_file_path("flake8")

    cli_result = run(cli_paths, cli_config, "modules")
    ext_result = run(ext_paths, ext_config, "extensions")
    return _combine_command_result(cli_result, ext_result)


def _config_file_path(style_type="pylint"):
    from configparser import NoSectionError
    try:
        cli_repo_path = get_azdev_config().get("cli", "repo_path")
    except NoSectionError:
        cli_repo_path = None
    try:
        ext_repo_path = get_azdev_config().get("ext", "repo_paths").split(',')[0]
    except NoSectionError:
        ext_repo_path = None

    if style_type not in ["pylint", "flake8"]:
        raise ValueError("style_tyle value allows only: pylint, flake8.")

    config_file_mapping = {
        "pylint": "pylintrc",
        "flake8": ".flake8",
    }
    default_config_file_mapping = {
        "cli": {
            "pylint": "cli_pylintrc",
            "flake8": "cli.flake8"
        },
        "ext": {
            "pylint": "ext_pylintrc",
            "flake8": "ext.flake8"
        }
    }

    if cli_repo_path:
        cli_config_path = os.path.join(cli_repo_path, config_file_mapping[style_type])
        if not os.path.exists(cli_config_path):
            cli_config_path = os.path.join(
                get_azdev_config_dir(),
                "config_files",
                default_config_file_mapping["cli"][style_type],
            )
    else:
        cli_config_path = os.path.join(
            get_azdev_config_dir(),
            "config_files",
            default_config_file_mapping["cli"][style_type],
        )

    if ext_repo_path:
        ext_config_path = os.path.join(ext_repo_path, config_file_mapping[style_type])
        if not os.path.exists(ext_config_path):
            ext_config_path = os.path.join(
                get_azdev_config_dir(),
                "config_files",
                default_config_file_mapping["ext"][style_type],
            )
    else:
        ext_config_path = os.path.join(
            get_azdev_config_dir(),
            "config_files",
            default_config_file_mapping["ext"][style_type],
        )

    return cli_config_path, ext_config_path