# Copyright 2014 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
# http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file 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.
from os import path, chdir, getcwd, makedirs
import zipfile
import datetime
from typing import Optional

from cement.utils.misc import minimal_logger

from ebcli.core import io, hooks, fileoperations
from ebcli.core.abstractcontroller import AbstractBaseController
from ebcli.lib import elasticbeanstalk
from ebcli.objects.environment import Environment
from ebcli.objects.exceptions import InvalidOptionsError, NotInitializedError
from ebcli.operations import commonops, deployops, composeops, statusops
from ebcli.resources.strings import strings, flag_text

LOG = minimal_logger(__name__)


class DeployController(AbstractBaseController):
    class Meta(AbstractBaseController.Meta):
        label = 'deploy'
        description = strings['deploy.info']
        arguments = [
            (['environment_name'], dict(
                action='store', nargs='?', default=[],
                help=flag_text['deploy.env'])),
            (['--modules'], dict(help=flag_text['deploy.modules'], nargs='*')),
            (['-g', '--env-group-suffix'], dict(help=flag_text['deploy.group_suffix'])),
            (['--version'], dict(help=flag_text['deploy.version'])),
            (['-l', '--label'], dict(help=flag_text['deploy.label'])),
            (['-m', '--message'], dict(help=flag_text['deploy.message'])),
            (['-nh', '--nohang'], dict(
                action='store_true', help=flag_text['deploy.nohang'])),
            (['--staged'], dict(
                action='store_true', help=flag_text['deploy.staged'])),
            (['--timeout'], dict(type=int, help=flag_text['general.timeout'])),
            (['--source'], dict(help=flag_text['deploy.source'])),
            (['-p', '--process'], dict(
                action='store_true', help=flag_text['deploy.process'])),
            (['--archive'], dict(help=flag_text['deploy.archive'])),]

        usage = AbstractBaseController.Meta.usage.replace('{cmd}', label)

    def do_command(self):
        self.nohang = self.app.pargs.nohang
        self.timeout = self.app.pargs.timeout
        if self.nohang:
            self.timeout = 0

        if self.app.pargs.modules:
            self.multiple_app_deploy()
            return

        self.message = self.app.pargs.message
        self.staged = self.app.pargs.staged
        self.source = self.app.pargs.source
        self.archive = self.app.pargs.archive
        if self.archive and not self.app.pargs.region:
            raise InvalidOptionsError(strings['deploy.archivewithoutregion'])
        if self.source and self.archive:
            raise InvalidOptionsError(strings['deploy.archivewithsource'])

        self.env_name = self.app.pargs.environment_name
        if self.archive and not self.env_name:
            raise InvalidOptionsError(strings['deploy.archivewithoutenvname'])
        elif not self.archive:
            self.env_name = self.env_name or self.get_env_name()

        if self.archive:
            environment = elasticbeanstalk.get_environment(env_name=self.env_name)
            self.app_name = environment.app_name
        else:
            self.app_name = self.get_app_name()

        self.version = self.app.pargs.version
        if self.version and self.archive:
            raise InvalidOptionsError(strings['deploy.archivewithversion'])

        self.label = self.app.pargs.label
        self.process = self.app.pargs.process
        group_name = self.app.pargs.env_group_suffix

        _check_env_lifecycle_state(self.env_name)

        if self.version and (self.message or self.label):
            raise InvalidOptionsError(strings['deploy.invalidoptions'])

        process_app_versions = fileoperations.env_yaml_exists() or self.process

        source_bundle_zip = None
        if self.archive:
            source_bundle_zip = get_or_create_source_bundle(archive=self.archive, label=self.label)
            self.label = self.label or source_bundle_zip.split(path.sep)[-1]

        deployops.deploy(self.app_name, self.env_name, self.version, self.label,
                         self.message, group_name=group_name, process_app_versions=process_app_versions,
                         staged=self.staged, timeout=self.timeout, source=self.source,
                         source_bundle=source_bundle_zip)

    def multiple_app_deploy(self):
        missing_env_yaml = []
        top_dir = getcwd()

        for module in self.app.pargs.modules:
            if not path.isdir(path.join(top_dir, module)):
                continue

            chdir(path.join(top_dir, module))

            if not fileoperations.env_yaml_exists():
                missing_env_yaml.append(module)

            chdir(top_dir)

        if len(missing_env_yaml) > 0:
            module_list = ''
            for module_name in missing_env_yaml:
                module_list = module_list + module_name + ', '
            io.echo(strings['deploy.modulemissingenvyaml'].replace('{modules}', module_list[:-2]))

            return

        self.compose_deploy()

    def compose_deploy(self):
        app_name = None
        modules = self.app.pargs.modules
        group_name = self.app.pargs.env_group_suffix

        env_names = []
        stages_version_labels = {}
        stages_env_names = {}

        top_dir = getcwd()
        for module in modules:
            if not path.isdir(path.join(top_dir, module)):
                io.log_error(strings['deploy.notadirectory'].replace('{module}', module))
                continue

            chdir(path.join(top_dir, module))

            if not group_name:
                group_name = commonops.get_current_branch_group_suffix()
            if group_name not in stages_version_labels.keys():
                stages_version_labels[group_name] = []
                stages_env_names[group_name] = []

            if not app_name:
                app_name = self.get_app_name()

            io.echo('--- Creating application version for module: {0} ---'.format(module))

            hooks.set_region(None)
            hooks.set_ssl(None)
            hooks.set_profile(None)

            if not app_name:
                app_name = self.get_app_name()

            process_app_version = fileoperations.env_yaml_exists()
            version_label = commonops.create_app_version(app_name, process=process_app_version)

            stages_version_labels[group_name].append(version_label)

            environment_name = fileoperations.get_env_name_from_env_yaml()

            if environment_name is not None:
                commonops.set_environment_for_current_branch(environment_name.
                                                             replace('+', '-{0}'.
                                                                     format(group_name)))

                env_name = commonops.get_current_branch_environment()
                stages_env_names[group_name].append(env_name)
                env_names.append(env_name)
            else:
                io.echo(strings['deploy.noenvname'].replace('{module}', module))

                stages_version_labels[group_name] = [
                    v for v in stages_version_labels[group_name]
                    if v != version_label
                ]

            chdir(top_dir)

        if len(stages_version_labels) > 0:
            for stage in stages_version_labels.keys():
                request_id = composeops.compose_no_events(app_name, stages_version_labels[stage],
                                                          group_name=stage)
                if request_id is None:
                    io.log_error("Unable to compose modules.")
                    return

                commonops.wait_for_compose_events(request_id, app_name, env_names, self.timeout)
        else:
            io.log_warning(strings['compose.novalidmodules'])


def _check_env_lifecycle_state(env_name):
    env = elasticbeanstalk.get_environment(env_name=env_name)
    statusops.alert_environment_status(env)


def get_or_create_source_bundle(archive: str, label: str=None) -> Optional[str]:
    if archive and zipfile.is_zipfile(archive):
        source_bundle_zip = archive
    elif archive and path.isdir(archive):
        upload_target_dir = archive
        utcnow = str(datetime.datetime.now(datetime.UTC).timestamp())
        migrations_path = path.join(path.expanduser('~'), '.ebartifacts')
        if label:
            zip_file_name = f"{label}.zip"
        else:
            zip_file_name = f"archives-{utcnow}.zip"
        source_bundle_zip = path.join(migrations_path, 'archives', zip_file_name)
        makedirs(path.join(migrations_path, 'archives'), exist_ok=True)
        fileoperations.zip_up_folder(
            upload_target_dir,
            source_bundle_zip
        )
    else:
        raise InvalidOptionsError(strings['deploy.archive_must_be_dir_or_zip'])
    return source_bundle_zip