"""Sanity test for proper import exception handling."""
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type

import os

from .. import types as t

from ..sanity import (
    SanityMultipleVersion,
    SanityMessage,
    SanityFailure,
    SanitySuccess,
    SANITY_ROOT,
)

from ..target import (
    TestTarget,
)

from ..util import (
    SubprocessError,
    remove_tree,
    display,
    find_python,
    parse_to_list_of_dict,
    make_dirs,
    is_subdir,
    ANSIBLE_LIB_ROOT,
)

from ..util_common import (
    intercept_command,
    run_command,
)

from ..ansible_util import (
    ansible_environment,
)

from ..executor import (
    generate_pip_install,
)

from ..config import (
    SanityConfig,
)

from ..coverage_util import (
    coverage_context,
)

from ..data import (
    data_context,
)


class ImportTest(SanityMultipleVersion):
    """Sanity test for proper import exception handling."""
    def filter_targets(self, targets):  # type: (t.List[TestTarget]) -> t.List[TestTarget]
        """Return the given list of test targets, filtered to include only those relevant for the test."""
        return [target for target in targets if os.path.splitext(target.path)[1] == '.py' and
                (is_subdir(target.path, data_context().content.module_path) or is_subdir(target.path, data_context().content.module_utils_path))]

    def test(self, args, targets, python_version):
        """
        :type args: SanityConfig
        :type targets: SanityTargets
        :type python_version: str
        :rtype: TestResult
        """
        settings = self.load_processor(args, python_version)

        paths = [target.path for target in targets.include]

        env = ansible_environment(args, color=False)

        # create a clean virtual environment to minimize the available imports beyond the python standard library
        virtual_environment_path = os.path.abspath('test/runner/.tox/minimal-py%s' % python_version.replace('.', ''))
        virtual_environment_bin = os.path.join(virtual_environment_path, 'bin')

        remove_tree(virtual_environment_path)

        python = find_python(python_version)

        cmd = [python, '-m', 'virtualenv', virtual_environment_path, '--python', python, '--no-setuptools', '--no-wheel']

        if not args.coverage:
            cmd.append('--no-pip')

        run_command(args, cmd, capture=True)

        # add the importer to our virtual environment so it can be accessed through the coverage injector
        importer_path = os.path.join(virtual_environment_bin, 'importer.py')
        if not args.explain:
            os.symlink(os.path.abspath(os.path.join(SANITY_ROOT, 'import', 'importer.py')), importer_path)

        # create a minimal python library
        python_path = os.path.abspath('test/runner/.tox/import/lib')
        ansible_path = os.path.join(python_path, 'ansible')
        ansible_init = os.path.join(ansible_path, '__init__.py')
        ansible_link = os.path.join(ansible_path, 'module_utils')

        if not args.explain:
            remove_tree(ansible_path)

            make_dirs(ansible_path)

            with open(ansible_init, 'w'):
                pass

            os.symlink(os.path.join(ANSIBLE_LIB_ROOT, 'module_utils'), ansible_link)

            if data_context().content.collection:
                # inject just enough Ansible code for the collections loader to work on all supported Python versions
                # the __init__.py files are needed only for Python 2.x
                # the empty modules directory is required for the collection loader to generate the synthetic packages list

                make_dirs(os.path.join(ansible_path, 'utils'))
                with open(os.path.join(ansible_path, 'utils/__init__.py'), 'w'):
                    pass

                os.symlink(os.path.join(ANSIBLE_LIB_ROOT, 'utils', 'collection_loader.py'), os.path.join(ansible_path, 'utils', 'collection_loader.py'))
                os.symlink(os.path.join(ANSIBLE_LIB_ROOT, 'utils', 'singleton.py'), os.path.join(ansible_path, 'utils', 'singleton.py'))

                make_dirs(os.path.join(ansible_path, 'modules'))
                with open(os.path.join(ansible_path, 'modules/__init__.py'), 'w'):
                    pass

        # activate the virtual environment
        env['PATH'] = '%s:%s' % (virtual_environment_bin, env['PATH'])
        env['PYTHONPATH'] = python_path

        # make sure coverage is available in the virtual environment if needed
        if args.coverage:
            run_command(args, generate_pip_install(['pip'], 'sanity.import', packages=['setuptools']), env=env)
            run_command(args, generate_pip_install(['pip'], 'sanity.import', packages=['coverage']), env=env)
            run_command(args, ['pip', 'uninstall', '--disable-pip-version-check', '-y', 'setuptools'], env=env)
            run_command(args, ['pip', 'uninstall', '--disable-pip-version-check', '-y', 'pip'], env=env)

        cmd = ['importer.py']

        data = '\n'.join(paths)

        display.info(data, verbosity=4)

        results = []

        virtualenv_python = os.path.join(virtual_environment_bin, 'python')

        try:
            with coverage_context(args):
                stdout, stderr = intercept_command(args, cmd, self.name, env, capture=True, data=data, python_version=python_version,
                                                   virtualenv=virtualenv_python)

            if stdout or stderr:
                raise SubprocessError(cmd, stdout=stdout, stderr=stderr)
        except SubprocessError as ex:
            if ex.status != 10 or ex.stderr or not ex.stdout:
                raise

            pattern = r'^(?P<path>[^:]*):(?P<line>[0-9]+):(?P<column>[0-9]+): (?P<message>.*)$'

            results = parse_to_list_of_dict(pattern, ex.stdout)

            results = [SanityMessage(
                message=r['message'],
                path=r['path'],
                line=int(r['line']),
                column=int(r['column']),
            ) for r in results]

        results = settings.process_errors(results, paths)

        if results:
            return SanityFailure(self.name, messages=results, python_version=python_version)

        return SanitySuccess(self.name, python_version=python_version)