import argparse

from osc_lib.command import command

from mistralclient.commands.v2 import base
from mistralclient import utils


class ActionFormatter(base.MistralFormatter):
    COLUMNS = [
        ('id', 'ID'),
        ('name', 'Name'),
        ('is_system', 'Is system'),
        ('input', 'Input'),
        ('description', 'Description'),
        ('tags', 'Tags'),
        ('created_at', 'Created at'),
        ('updated_at', 'Updated at'),
    ]

    @staticmethod
    def format(action=None, lister=False):
        if action:
            tags = getattr(action, 'tags', None) or []
            input_ = action.input if not lister else base.cut(action.input)
            desc = (action.description if not lister
                    else base.cut(action.description))

            data = (
                action.id,
                action.name,
                action.is_system,
                input_,
                desc,
                base.wrap(', '.join(tags)) or '<none>',
                action.created_at,
            )
            if hasattr(action, 'updated_at'):
                data += (action.updated_at,)
            else:
                data += (None,)

        else:
            data = (tuple('' for _ in range(len(ActionFormatter.COLUMNS))),)

        return ActionFormatter.headings(), data


class List(base.MistralLister):
    """List all actions."""

    def _get_format_function(self):
        return ActionFormatter.format_list

    def get_parser(self, prog_name):
        parser = super(List, self).get_parser(prog_name)

        parser.add_argument(
            '--namespace',
            nargs='?',
            default='',
            help="Namespace of the actions.",
        )

        return parser

    def _get_resources(self, parsed_args):
        mistral_client = self.app.client_manager.workflow_engine

        return mistral_client.actions.list(
            marker=parsed_args.marker,
            limit=parsed_args.limit,
            sort_keys=parsed_args.sort_keys,
            sort_dirs=parsed_args.sort_dirs,
            fields=ActionFormatter.fields(),
            namespace=parsed_args.namespace,
            **base.get_filters(parsed_args)
        )


class Get(command.ShowOne):
    """Show specific action."""

    def get_parser(self, prog_name):
        parser = super(Get, self).get_parser(prog_name)

        parser.add_argument('action', help='Action (name or ID)')
        parser.add_argument(
            '--namespace',
            nargs='?',
            default='',
            help="Namespace to create the action within.",
        )

        return parser

    def take_action(self, parsed_args):
        mistral_client = self.app.client_manager.workflow_engine

        action = mistral_client.actions.get(
            parsed_args.action,
            parsed_args.namespace
        )

        return ActionFormatter.format(action)


class Create(base.MistralLister):
    """Create new action."""

    def get_parser(self, prog_name):
        parser = super(Create, self).get_parser(prog_name)

        parser.add_argument(
            'definition',
            type=argparse.FileType('r'),
            help='Action definition file'
        )
        parser.add_argument(
            '--public',
            action='store_true',
            help='With this flag action will be marked as "public".'
        )
        parser.add_argument(
            '--namespace',
            nargs='?',
            default='',
            help="Namespace to create the action within.",
        )

        return parser

    def _validate_parsed_args(self, parsed_args):
        if not parsed_args.definition:
            raise RuntimeError("Provide action definition file.")

    def _get_format_function(self):
        return ActionFormatter.format_list

    def _get_resources(self, parsed_args):
        scope = 'public' if parsed_args.public else 'private'

        mistral_client = self.app.client_manager.workflow_engine

        return mistral_client.actions.create(
            parsed_args.definition.read(),
            namespace=parsed_args.namespace,
            scope=scope
        )


class Delete(command.Command):
    """Delete action."""

    def get_parser(self, prog_name):
        parser = super(Delete, self).get_parser(prog_name)

        parser.add_argument(
            'action',
            nargs='+',
            help='Name or ID of action(s).'
        )
        parser.add_argument(
            '--namespace',
            nargs='?',
            default='',
            help="Namespace of the action(s).",
        )

        return parser

    def take_action(self, parsed_args):
        mistral_client = self.app.client_manager.workflow_engine

        utils.do_action_on_many(
            lambda s: mistral_client.actions.delete(
                s,
                namespace=parsed_args.namespace),
            parsed_args.action,
            "Request to delete action %s has been accepted.",
            "Unable to delete the specified action(s)."
        )


class Update(base.MistralLister):
    """Update action."""

    def get_parser(self, prog_name):
        parser = super(Update, self).get_parser(prog_name)

        parser.add_argument(
            'definition',
            type=argparse.FileType('r'),
            help='Action definition file'
        )
        parser.add_argument('--id', help='Action ID.')
        parser.add_argument(
            '--public',
            action='store_true',
            help='With this flag action will be marked as "public".'
        )
        parser.add_argument(
            '--namespace',
            nargs='?',
            default='',
            help="Namespace of the action.",
        )

        return parser

    def _get_format_function(self):
        return ActionFormatter.format_list

    def _get_resources(self, parsed_args):
        scope = 'public' if parsed_args.public else 'private'

        mistral_client = self.app.client_manager.workflow_engine

        return mistral_client.actions.update(
            parsed_args.definition.read(),
            scope=scope,
            id=parsed_args.id
        )


class GetDefinition(command.Command):
    """Show action definition."""

    def get_parser(self, prog_name):
        parser = super(GetDefinition, self).get_parser(prog_name)

        parser.add_argument('name', help='Action name')
        parser.add_argument(
            '--namespace',
            nargs='?',
            default='',
            help="Namespace of the action.",
        )

        return parser

    def take_action(self, parsed_args):
        mistral_client = self.app.client_manager.workflow_engine
        definition = mistral_client.actions.get(
            parsed_args.name,
            namespace=parsed_args.namespace).definition

        self.app.stdout.write(definition or "\n")


class Validate(command.ShowOne):
    """Validate action."""

    @staticmethod
    def _format(result=None):
        columns = ('Valid', 'Error')

        if result:
            data = (result.get('valid'), result.get('error'))
        else:
            data = (tuple('<none>' for _ in range(len(columns))),)

        return columns, data

    def get_parser(self, prog_name):
        parser = super(Validate, self).get_parser(prog_name)

        parser.add_argument(
            'definition',
            type=argparse.FileType('r'),
            help='action definition file'
        )

        return parser

    def take_action(self, parsed_args):
        mistral_client = self.app.client_manager.workflow_engine

        result = mistral_client.actions.validate(
            parsed_args.definition.read()
        )

        return self._format(result)
