# Copyright 2018 AT&T Intellectual Property.  All other rights reserved.
#
# Licensed 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 functools
import logging
import sys

import click

from pegleg import config
from pegleg import engine

LOG = logging.getLogger(__name__)

LOG_FORMAT = '%(asctime)s %(levelname)-8s %(name)s:%(funcName)s [%(lineno)3d] %(message)s'  # noqa

CONTEXT_SETTINGS = {
    'help_option_names': ['-h', '--help'],
}


def _process_repositories_callback(ctx, param, value):
    """Convenient callback for ``@click.argument(site_name)``.

    Automatically processes repository information for the specified site. This
    entails cloning all requires repositories and checking out specified
    references for each repository.
    """
    engine.repository.process_repositories(value)
    return value


MAIN_REPOSITORY_OPTION = click.option(
    '-r',
    '--site-repository',
    'site_repository',
    required=True,
    help=
    'Path or URL to the primary repository (containing site_definition.yaml) '
    'repo.')

EXTRA_REPOSITORY_OPTION = click.option(
    '-e',
    '--extra-repository',
    'extra_repositories',
    multiple=True,
    help='Path or URL of additional repositories. These should be named per '
    'the site-definition file, e.g. -e global=/opt/global -e '
    'secrets=/opt/secrets. By default, the revision specified in the '
    'site-definition for the site will be leveraged but can be overridden '
    'using -e global=/opt/global@revision.')

REPOSITORY_KEY_OPTION = click.option(
    '-k',
    '--repo-key',
    'repo_key',
    help='The SSH public key to use when cloning remote authenticated '
    'repositories.')

REPOSITORY_USERNAME_OPTION = click.option(
    '-u',
    '--repo-username',
    'repo_username',
    help=
    'The SSH username to use when cloning remote authenticated repositories '
    'specified in the site-definition file. Any occurrences of REPO_USERNAME '
    'will be replaced with this value.')

REPOSITORY_CLONE_PATH_OPTION = click.option(
    '-p',
    '--clone-path',
    'clone_path',
    help='The path where the repo will be cloned. By default the repo will be '
    'cloned to the /tmp path. If this option is included and the repo already '
    'exists, then the repo will not be cloned again and the user must specify '
    'a new clone path or pass in the local copy of the repository as the site '
    'repository. Suppose the repo name is airship-treasuremap and the clone '
    'path is /tmp/mypath then the following directory is created '
    '/tmp/mypath/airship-treasuremap which will contain the contents of the '
    'repo')

ALLOW_MISSING_SUBSTITUTIONS_OPTION = click.option(
    '-f',
    '--fail-on-missing-sub-src',
    required=False,
    type=click.BOOL,
    default=True,
    help=
    "Raise Deckhand exception on missing substition sources. Defaults to True."
)

EXCLUDE_LINT_OPTION = click.option(
    '-x',
    '--exclude',
    'exclude_lint',
    multiple=True,
    help='Excludes specified linting checks. Warnings will still be issued. '
    '-w takes priority over -x.')

WARN_LINT_OPTION = click.option(
    '-w',
    '--warn',
    'warn_lint',
    multiple=True,
    help='Warn if linting check fails. -w takes priority over -x.')

SITE_REPOSITORY_ARGUMENT = click.argument(
    'site_name', callback=_process_repositories_callback)


@click.group(context_settings=CONTEXT_SETTINGS)
@click.option(
    '-v',
    '--verbose',
    is_flag=bool,
    default=False,
    help='Enable debug logging')
def main(*, verbose):
    """Main CLI meta-group, which includes the following groups:

    * site: site-level actions
    * repo: repository-level actions
    * stub (DEPRECATED)

    """

    if verbose:
        log_level = logging.DEBUG
    else:
        log_level = logging.ERROR
    logging.basicConfig(format=LOG_FORMAT, level=log_level)


@main.group(help='Commands related to repositories')
@MAIN_REPOSITORY_OPTION
@REPOSITORY_CLONE_PATH_OPTION
# TODO(felipemonteiro): Support EXTRA_REPOSITORY_OPTION as well to be
# able to lint multiple repos together.
@REPOSITORY_USERNAME_OPTION
@REPOSITORY_KEY_OPTION
def repo(*, site_repository, clone_path, repo_key, repo_username):
    """Group for repo-level actions, which include:

    * lint: lint all sites across the repository

    """

    config.set_site_repo(site_repository)
    config.set_clone_path(clone_path)
    config.set_repo_key(repo_key)
    config.set_repo_username(repo_username)


def _lint_helper(*,
                 fail_on_missing_sub_src,
                 exclude_lint,
                 warn_lint,
                 site_name=None):
    """Helper for executing lint on specific site or all sites in repo."""
    if site_name:
        func = functools.partial(engine.lint.site, site_name=site_name)
    else:
        func = engine.lint.full
    warns = func(
        fail_on_missing_sub_src=fail_on_missing_sub_src,
        exclude_lint=exclude_lint,
        warn_lint=warn_lint)
    if warns:
        click.echo("Linting passed, but produced some warnings.")
        for w in warns:
            click.echo(w)


@repo.command('lint', help='Lint all sites in a repository')
@ALLOW_MISSING_SUBSTITUTIONS_OPTION
@EXCLUDE_LINT_OPTION
@WARN_LINT_OPTION
def lint_repo(*, fail_on_missing_sub_src, exclude_lint, warn_lint):
    """Lint all sites using checks defined in :mod:`pegleg.engine.errorcodes`.
    """
    engine.repository.process_site_repository(update_config=True)
    _lint_helper(
        fail_on_missing_sub_src=fail_on_missing_sub_src,
        exclude_lint=exclude_lint,
        warn_lint=warn_lint)


@main.group(help='Commands related to sites')
@MAIN_REPOSITORY_OPTION
@REPOSITORY_CLONE_PATH_OPTION
@EXTRA_REPOSITORY_OPTION
@REPOSITORY_USERNAME_OPTION
@REPOSITORY_KEY_OPTION
def site(*, site_repository, clone_path, extra_repositories, repo_key,
         repo_username):
    """Group for site-level actions, which include:

    * list: list available sites in a manifests repo
    * lint: lint a site along with all its dependencies
    * render: render a site using Deckhand
    * show: show a sites' files

    """

    config.set_site_repo(site_repository)
    config.set_clone_path(clone_path)
    config.set_extra_repo_overrides(extra_repositories or [])
    config.set_repo_key(repo_key)
    config.set_repo_username(repo_username)


@site.command(help='Output complete config for one site')
@click.option(
    '-s',
    '--save-location',
    'save_location',
    help='Directory to output the complete site definition. Created '
    'automatically if it does not already exist.')
@click.option(
    '--validate',
    'validate',
    is_flag=True,
    # TODO(felipemonteiro): Potentially set this to True in the future. This
    # is currently set to False to skip validation by default for backwards
    # compatibility concerns.
    default=False,
    help='Perform validations on documents prior to collection.')
@click.option(
    '-x',
    '--exclude',
    'exclude_lint',
    multiple=True,
    help='Excludes specified linting checks. Warnings will still be issued. '
    '-w takes priority over -x.')
@click.option(
    '-w',
    '--warn',
    'warn_lint',
    multiple=True,
    help='Warn if linting check fails. -w takes priority over -x.')
@SITE_REPOSITORY_ARGUMENT
def collect(*, save_location, validate, exclude_lint, warn_lint, site_name):
    """Collects documents into a single site-definition.yaml file, which
    defines the entire site definition and contains all documents required
    for ingestion by Airship.

    If ``save_location`` isn't specified, then the output is directed to
    stdout.

    Collect can lint documents prior to collection if the ``--validate``
    flag is optionally included.
    """
    if validate:
        # Lint the primary repo prior to document collection.
        _lint_helper(
            site_name=site_name,
            fail_on_missing_sub_src=True,
            exclude_lint=exclude_lint,
            warn_lint=warn_lint)
    engine.site.collect(site_name, save_location)


@site.command('list', help='List known sites')
@click.option(
    '-o',
    '--output',
    'output_stream',
    type=click.File(mode='w'),
    default=sys.stdout,
    help='Where to output. Defaults to sys.stdout.')
def list_sites(*, output_stream):
    engine.repository.process_site_repository(update_config=True)
    engine.site.list_(output_stream)


@site.command(help='Show details for one site')
@click.option(
    '-o',
    '--output',
    'output_stream',
    type=click.File(mode='w'),
    default=sys.stdout,
    help='Where to output. Defaults to sys.stdout.')
@SITE_REPOSITORY_ARGUMENT
def show(*, output_stream, site_name):
    engine.site.show(site_name, output_stream)


@site.command('render', help='Render a site through the deckhand engine')
@click.option(
    '-o',
    '--output',
    'output_stream',
    type=click.File(mode='w'),
    default=sys.stdout,
    help='Where to output. Defaults to sys.stdout.')
@SITE_REPOSITORY_ARGUMENT
def render(*, output_stream, site_name):
    engine.site.render(site_name, output_stream)


@site.command('lint', help='Lint a given site in a repository')
@ALLOW_MISSING_SUBSTITUTIONS_OPTION
@EXCLUDE_LINT_OPTION
@WARN_LINT_OPTION
@SITE_REPOSITORY_ARGUMENT
def lint_site(*, fail_on_missing_sub_src, exclude_lint, warn_lint, site_name):
    """Lint a given site using checks defined in
    :mod:`pegleg.engine.errorcodes`.
    """
    _lint_helper(
        site_name=site_name,
        fail_on_missing_sub_src=fail_on_missing_sub_src,
        exclude_lint=exclude_lint,
        warn_lint=warn_lint)


@main.group(help='Commands related to types')
@MAIN_REPOSITORY_OPTION
@REPOSITORY_CLONE_PATH_OPTION
@EXTRA_REPOSITORY_OPTION
@REPOSITORY_USERNAME_OPTION
@REPOSITORY_KEY_OPTION
def type(*, site_repository, clone_path, extra_repositories, repo_key,
         repo_username):
    """Group for repo-level actions, which include:

    * list: list all types across the repository

    """
    config.set_site_repo(site_repository)
    config.set_clone_path(clone_path)
    config.set_extra_repo_overrides(extra_repositories or [])
    config.set_repo_key(repo_key)
    config.set_repo_username(repo_username)


@type.command('list', help='List known types')
@click.option(
    '-o',
    '--output',
    'output_stream',
    type=click.File(mode='w'),
    default=sys.stdout,
    help='Where to output. Defaults to sys.stdout.')
def list_types(*, output_stream):
    """List type names for a given repository."""
    engine.repository.process_site_repository(update_config=True)
    engine.type.list_types(output_stream)


@site.group(name='secrets', help='Commands to manage site secrets documents')
def secrets():
    pass


@secrets.command(
    'encrypt',
    help='Command to encrypt and wrap site secrets '
    'documents with metadata.storagePolicy set '
    'to encrypted, in pegleg managed documents.')
@click.option(
    '-s',
    '--save-location',
    'save_location',
    default=None,
    help='Directory to output the encrypted site secrets files. Created '
    'automatically if it does not already exist. '
    'If save_location is not provided, the output encrypted files will '
    'overwrite the original input files (default behavior)')
@click.option(
    '-a',
    '--author',
    'author',
    required=True,
    help='Identifier for the program or person who is encrypting the secrets '
         'documents')
@click.argument('site_name')
def encrypt(*, save_location, author, site_name):
    engine.repository.process_repositories(site_name)
    engine.secrets.encrypt(save_location, author, site_name)


@secrets.command(
    'decrypt',
    help='Command to unwrap and decrypt one site '
    'secrets document and print it to stdout.')
@click.option(
    '-f',
    '--filename',
    'file_name',
    help='The file name to decrypt and print out to stdout')
@click.argument('site_name')
def decrypt(*, file_name, site_name):
    engine.repository.process_repositories(site_name)
    engine.secrets.decrypt(file_name, site_name)