"""A setuptools based setup module.

"""
from __future__ import print_function

import os
import fnmatch
import re
import subprocess
import yaml

# Always prefer setuptools over distutils
from setuptools import setup, Command
from setuptools_lint.setuptools_command import PylintCommand
from six import string_types
from yamllint.config import YamlLintConfig
from yamllint.cli import Format
from yamllint import linter


def find_files(base_dir, exclude_dirs, include_dirs, file_regex):
    ''' find files matching file_regex '''
    found = []
    exclude_regex = ''
    include_regex = ''

    if exclude_dirs is not None:
        exclude_regex = r'|'.join([fnmatch.translate(x) for x in exclude_dirs]) or r'$.'

    # Don't use include_dirs, it is broken
    if include_dirs is not None:
        include_regex = r'|'.join([fnmatch.translate(x) for x in include_dirs]) or r'$.'

    for root, dirs, files in os.walk(base_dir):
        if exclude_dirs is not None:
            # filter out excludes for dirs
            dirs[:] = [d for d in dirs if not re.match(exclude_regex, d)]

        if include_dirs is not None:
            # filter for includes for dirs
            dirs[:] = [d for d in dirs if re.match(include_regex, d)]

        matches = [os.path.join(root, f) for f in files if re.search(file_regex, f) is not None]
        found.extend(matches)

    return found


def recursive_search(search_list, field):
    """
    Takes a list with nested dicts, and searches all dicts for a key of the
    field provided.  If the items in the list are not dicts, the items are not
    processed.
    """
    fields_found = []

    for item in search_list:
        if isinstance(item, dict):
            for key, value in item.items():
                if key == field:
                    fields_found.append(value)
                elif isinstance(value, list):
                    results = recursive_search(value, field)
                    for result in results:
                        fields_found.append(result)

    return fields_found


def find_playbooks():
    ''' find Ansible playbooks'''
    playbooks = set()

    exclude_dirs = ('adhoc', 'roles', '.tox', '.git', 'tests')
    for yaml_file in find_files(os.getcwd(), exclude_dirs, None, r'^[^\.].*\.ya?ml$'):
        with open(yaml_file, 'r') as contents:
            for task in yaml.safe_load(contents) or {}:
                if not isinstance(task, dict):
                    # Skip yaml files which are not a dictionary of tasks
                    continue
                if 'hosts' in task:
                    playbooks.add(yaml_file)
    return playbooks


class TEPInstallerCoreYamlLint(Command):
    ''' Command to run yamllint '''
    description = "Run yamllint tests"
    user_options = [
        ('excludes=', 'e', 'directories to exclude'),
        ('config-file=', 'c', 'config file to use'),
        ('format=', 'f', 'format to use (standard, parsable)'),
    ]

    def initialize_options(self):
        ''' initialize_options '''
        # Reason: Defining these attributes as a part of initialize_options is
        # consistent with upstream usage
        self.excludes = None
        self.config_file = None
        self.format = None

    def finalize_options(self):
        ''' finalize_options '''
        # Reason: These attributes are defined in initialize_options and this
        # usage is consistant with upstream usage
        if isinstance(self.excludes, string_types):
            self.excludes = self.excludes.split(',')
        if self.format is None:
            self.format = 'standard'
        assert (self.format in ['standard', 'parsable']), (
            'unknown format {0}.'.format(self.format))
        if self.config_file is None:
            self.config_file = '.yamllint'
        assert os.path.isfile(self.config_file), (
            'yamllint config file {0} does not exist.'.format(self.config_file))

    def run(self):
        ''' run command '''
        if self.excludes is not None:
            print("Excludes:\n{0}".format(yaml.dump(self.excludes, default_flow_style=False)))

        config = YamlLintConfig(file=self.config_file)

        has_errors = False
        has_warnings = False

        if self.format == 'parsable':
            format_method = Format.parsable
        else:
            format_method = Format.standard_color

        for yaml_file in find_files(os.getcwd(), self.excludes, None, r'^[^\.].*\.ya?ml$'):
            first = True
            with open(yaml_file, 'r') as contents:
                for problem in linter.run(contents, config):
                    if first and self.format != 'parsable':
                        print('\n{0}:'.format(os.path.relpath(yaml_file)))
                        first = False

                    print(format_method(problem, yaml_file))
                    if problem.level == linter.PROBLEM_LEVELS[2]:
                        has_errors = True
                    elif problem.level == linter.PROBLEM_LEVELS[1]:
                        has_warnings = True

        if has_errors or has_warnings:
            print('yamllint issues found')
            raise SystemExit(1)


class TEPInstallerCorePylint(PylintCommand):
    ''' Class to override the default behavior of PylintCommand '''

    # Reason: This method needs to be an instance method to conform to the
    # overridden method's signature
    def find_all_modules(self):
        ''' find all python files to test '''
        exclude_files = ('setup', 'kube', 'kvm_ipaddress_facts')
        exclude_dirs = ('.tox', 'test', 'tests', '.git')
        modules = []
        for match in find_files(os.getcwd(), exclude_dirs, None, r'\.py$'):
            package = os.path.basename(match).replace('.py', '')
            if package in exclude_files:
                continue
            modules.append(('tep_installer_core', package, match))
        return modules

    def get_finalized_command(self, cmd):
        ''' override get_finalized_command to ensure we use our
        find_all_modules method '''
        # see https://github.com/johnnoone/setuptools-pylint/blob/master/src/setuptools_lint/setuptools_command.py#L133
        if cmd == 'build_py':
            return self

    # Reason: This method needs to be an instance method to conform to the
    # overridden method's signature
    def with_project_on_sys_path(self, func, func_args, func_kwargs):
        ''' override behavior, since we don't need to build '''
        return func(*func_args, **func_kwargs)


class TEPInstallerCoreSyntaxCheck(Command):
    ''' Command to run Ansible syntax check'''
    description = "Run Ansible syntax check"
    user_options = []

    # Colors
    FAIL = '\033[31m'  # Red
    ENDC = '\033[0m'  # Reset

    def initialize_options(self):
        ''' initialize_options '''
        pass

    def finalize_options(self):
        ''' finalize_options '''
        pass

    def deprecate_jinja2_in_when(self, yaml_contents, yaml_file):
        ''' Check for Jinja2 templating delimiters in when conditions '''
        test_result = False
        failed_items = []

        search_results = recursive_search(yaml_contents, 'when')
        search_results.append(recursive_search(yaml_contents, 'failed_when'))
        for item in search_results:
            if isinstance(item, str):
                if '{{' in item or '{%' in item:
                    failed_items.append(item)
            else:
                for sub_item in item:
                    if isinstance(sub_item, bool):
                        continue
                    if '{{' in sub_item or '{%' in sub_item:
                        failed_items.append(sub_item)

        if len(failed_items) > 0:
            print('{}Error: Usage of Jinja2 templating delimiters in when '
                  'conditions is deprecated in Ansible 2.3.\n'
                  '  File: {}'.format(self.FAIL, yaml_file))
            for item in failed_items:
                print('  Found: "{}"'.format(item))
            print(self.ENDC)
            test_result = True

        return test_result

    def deprecate_include(self, yaml_contents, yaml_file):
        ''' Check for usage of include directive '''
        test_result = False

        search_results = recursive_search(yaml_contents, 'include')

        if len(search_results) > 0:
            print('{}Error: The `include` directive is deprecated in Ansible 2.4.\n'
                  'https://github.com/ansible/ansible/blob/devel/CHANGELOG.md\n'
                  '  File: {}'.format(self.FAIL, yaml_file))
            for item in search_results:
                print('  Found: "include: {}"'.format(item))
            print(self.ENDC)
            test_result = True

        return test_result

    def run(self):
        ''' run command '''

        has_errors = False

        print('#' * 60)
        print('Ansible Deprecation Checks')
        exclude_dirs = ('adhoc', 'files', 'meta', 'vars', 'defaults', '.tox', '.git')
        for yaml_file in find_files(
                os.getcwd(), exclude_dirs, None, r'^[^\.].*\.ya?ml$'):
            with open(yaml_file, 'r') as contents:
                yaml_contents = yaml.safe_load(contents)
                if not isinstance(yaml_contents, list):
                    continue

                # Check for Jinja2 templating delimiters in when conditions
                result = self.deprecate_jinja2_in_when(yaml_contents, yaml_file)
                has_errors = result or has_errors

                # Check for usage of include: directive
                result = self.deprecate_include(yaml_contents, yaml_file)
                has_errors = result or has_errors

        if not has_errors:
            print('...PASSED')

        entrypoint_playbooks = find_playbooks()

        print('#' * 60)
        print('Ansible Playbook Entry Point Syntax Checks')
        print('Entry point playbook count: {}'.format(len(entrypoint_playbooks)))
        for playbook in entrypoint_playbooks:
            print('-' * 60)
            print('Syntax checking playbook: {}'.format(playbook))

            # --syntax-check each entry point playbook
            try:
                # Create a host group list to avoid WARNING on unmatched host patterns
                tox_ansible_inv = os.environ['TOX_ANSIBLE_INV_PATH']
                subprocess.check_output(
                    ['ansible-playbook', '-i', tox_ansible_inv,
                     '--syntax-check', playbook, '-e', '@{}_extras'.format(tox_ansible_inv)]
                )
            except subprocess.CalledProcessError as cpe:
                print('{}Execution failed: {}{}'.format(
                    self.FAIL, cpe, self.ENDC))
                has_errors = True

        if has_errors:
            raise SystemExit(1)


class UnsupportedCommand(Command):
    ''' Basic Command to override unsupported commands '''
    user_options = []

    # Reason: This method needs to be an instance method to conform to the
    # overridden method's signature
    def initialize_options(self):
        ''' initialize_options '''
        pass

    # Reason: This method needs to be an instance method to conform to the
    # overridden method's signature
    def finalize_options(self):
        ''' initialize_options '''
        pass

    # Reason: This method needs to be an instance method to conform to the
    # overridden method's signature
    def run(self):
        ''' run command '''
        print("Unsupported command for tep-installer-core")


setup(
    name='tep-installer-core',
    license="Apache 2.0",
    cmdclass={
        'install': UnsupportedCommand,
        'develop': UnsupportedCommand,
        'build': UnsupportedCommand,
        'build_py': UnsupportedCommand,
        'build_ext': UnsupportedCommand,
        'egg_info': UnsupportedCommand,
        'sdist': UnsupportedCommand,
        'lint': TEPInstallerCorePylint,
        'yamllint': TEPInstallerCoreYamlLint,
        'ansible_syntax': TEPInstallerCoreSyntaxCheck,
    },
    packages=[],
)