# -*- coding: utf-8 -*-

# 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.
"""Cells resource and resource shell wrapper."""
from __future__ import print_function

import argparse
import sys

from cratonclient.common import cliutils
from cratonclient import exceptions as exc

DEFAULT_CELL_FIELDS = [
    'id',
    'name',
    'cloud_id',
    'region_id',
    'created_at',
]

CELL_FIELDS = DEFAULT_CELL_FIELDS + [
    'updated_at',
    'note',
    'variables',
    'project_id',
]


@cliutils.arg('id',
              metavar='<cell>',
              type=int,
              help='ID of the cell.')
def do_cell_show(cc, args):
    """Show detailed information about a cell."""
    cell = cc.cells.get(args.id)
    args.formatter.configure(wrap=72).handle(cell)


@cliutils.arg('-r', '--region',
              metavar='<region>',
              type=int,
              help='ID of the region that the cell belongs to.')
@cliutils.arg('--cloud',
              metavar='<cloud>',
              type=int,
              help='ID of the cloud that the cell belongs to.')
@cliutils.arg('--detail',
              action='store_true',
              default=False,
              help='Show detailed information about the cells.')
@cliutils.arg('--sort-key',
              metavar='<field>',
              help='Cell field that will be used for sorting.')
@cliutils.arg('--sort-dir',
              metavar='<direction>',
              default='asc',
              choices=('asc', 'desc'),
              help='Sort direction: "asc" (default) or "desc".')
@cliutils.arg('--fields',
              nargs='+',
              metavar='<fields>',
              default=DEFAULT_CELL_FIELDS,
              help='Space-separated list of fields to display. '
                   'Only these fields will be fetched from the server. '
                   'Can not be used when "--detail" is specified')
@cliutils.arg('--all',
              action='store_true',
              default=False,
              help='Retrieve and show all cells. This will override '
                   'the provided value for --limit and automatically '
                   'retrieve each page of results.')
@cliutils.arg('--limit',
              metavar='<limit>',
              type=int,
              help='Maximum number of cells to return.')
@cliutils.arg('--marker',
              metavar='<marker>',
              default=None,
              help='ID of the cell to use to resume listing cells.')
@cliutils.arg('--vars',
              metavar='<vars>',
              nargs='+',
              action='append',
              default=[],
              help='Variables to use as filter in the form of '
                   '--vars="key:value" --vars="key2:value2"')
def do_cell_list(cc, args):
    """Print list of cells which are registered with the Craton service."""
    params = {}
    if args.vars:
        query_vars = ",".join([i[0] for i in args.vars])
        params['vars'] = query_vars
    if args.cloud is not None:
        params['cloud_id'] = args.cloud
    if args.limit is not None:
        if args.limit < 0:
            raise exc.CommandError('Invalid limit specified. Expected '
                                   'non-negative limit, got {0}'
                                   .format(args.limit))
        params['limit'] = args.limit
    if args.all is True:
        params['limit'] = 100

    if args.detail:
        if args.fields and args.fields == DEFAULT_CELL_FIELDS:
            args.fields = CELL_FIELDS
        else:
            raise exc.CommandError(
                'Cannot specify both --fields and --detail.'
            )
        params['detail'] = args.detail

    fields = args.fields
    for field in fields:
        if field not in CELL_FIELDS:
            raise exc.CommandError(
                'Invalid field "{}"'.format(field)
            )
    sort_key = args.sort_key and args.sort_key.lower()
    if sort_key is not None:
        if sort_key not in CELL_FIELDS:
            raise exc.CommandError(
                ('"--sort-key" value was "{}" but should '
                 'be one of: {}').format(
                     args.sort_key,
                     ', '.join(CELL_FIELDS)
                )
            )
        params['sort_key'] = sort_key
    if args.region is not None:
        params['region_id'] = args.region

    params['sort_dir'] = args.sort_dir
    params['marker'] = args.marker
    params['autopaginate'] = args.all

    listed_cells = cc.cells.list(**params)
    args.formatter.configure(fields=fields).handle(listed_cells)


@cliutils.arg('-n', '--name',
              metavar='<name>',
              required=True,
              help='Name of the cell.')
@cliutils.arg('-r', '--region',
              dest='region_id',
              metavar='<region>',
              type=int,
              required=True,
              help='ID of the region that the cell belongs to.')
@cliutils.arg('--cloud',
              dest='cloud_id',
              metavar='<cloud>',
              type=int,
              required=True,
              help='ID of the cloud that the cell belongs to.')
@cliutils.arg('--note',
              help='Note about the cell.')
def do_cell_create(cc, args):
    """Register a new cell with the Craton service."""
    fields = {k: v for (k, v) in vars(args).items()
              if k in CELL_FIELDS and not (v is None)}
    cell = cc.cells.create(**fields)
    args.formatter.configure(wrap=72).handle(cell)


@cliutils.arg('id',
              metavar='<cell>',
              type=int,
              help='ID of the cell.')
@cliutils.arg('-n', '--name',
              metavar='<name>',
              help='Name of the cell.')
@cliutils.arg('-r', '--region',
              dest='region_id',
              metavar='<region>',
              type=int,
              help='Desired ID of the region that the cell should change to.')
@cliutils.arg('--cloud',
              dest='cloud_id',
              metavar='<cloud>',
              type=int,
              help='Desired ID of the cloud that the cell should change to.')
@cliutils.arg('--note',
              help='Note about the cell.')
def do_cell_update(cc, args):
    """Update a cell that is registered with the Craton service."""
    fields = {k: v for (k, v) in vars(args).items()
              if k in CELL_FIELDS and not (v is None)}
    cell_id = fields.pop('id')
    if not fields:
        raise exc.CommandError(
            'Nothing to update... Please specify one of --name, --region, '
            '--cloud, or --note'
        )
    cell = cc.cells.update(cell_id, **fields)
    args.formatter.configure(wrap=72).handle(cell)


@cliutils.arg('id',
              metavar='<cell>',
              type=int,
              help='ID of the cell.')
def do_cell_delete(cc, args):
    """Delete a cell that is registered with the Craton service."""
    try:
        response = cc.cells.delete(args.id)
    except exc.ClientException as client_exc:
        raise exc.CommandError(
            'Failed to delete cell {} due to "{}:{}"'.format(
                args.id, client_exc.__class__, str(client_exc)
            )
        )
    else:
        print("Cell {0} was {1} deleted.".
              format(args.id, 'successfully' if response else 'not'))


@cliutils.arg('id',
              metavar='<cell>',
              type=int,
              help='ID or name of the cell.')
@cliutils.handle_shell_exception
def do_cell_vars_get(cc, args):
    """Get variables for a cell."""
    variables = cc.cells.get(args.id).variables.get()
    formatter = args.formatter.configure(dict_property="Variable", wrap=72)
    formatter.handle(variables)


@cliutils.arg('id',
              metavar='<cell>',
              type=int,
              help='ID of the cell.')
@cliutils.arg('variables', nargs=argparse.REMAINDER)
@cliutils.handle_shell_exception
def do_cell_vars_set(cc, args):
    """Set variables for a cell."""
    cell_id = args.id
    if not args.variables and sys.stdin.isatty():
        raise exc.CommandError(
            'Nothing to update... Please specify variables to set in the '
            'following format: "key=value". You may also specify variables to '
            'delete by key using the format: "key="'
        )
    adds, deletes = cliutils.variable_updates(args.variables)
    variables = cc.cells.get(cell_id).variables
    if deletes:
        variables.delete(*deletes)
    variables.update(**adds)
    formatter = args.formatter.configure(wrap=72, dict_property="Variable")
    formatter.handle(variables.get())


@cliutils.arg('id',
              metavar='<cell>',
              type=int,
              help='ID of the cell.')
@cliutils.arg('variables', nargs=argparse.REMAINDER)
@cliutils.handle_shell_exception
def do_cell_vars_delete(cc, args):
    """Delete variables for a cell by key."""
    cell_id = args.id
    if not args.variables and sys.stdin.isatty():
        raise exc.CommandError(
            'Nothing to delete... Please specify variables to delete by '
            'listing the keys you wish to delete separated by spaces.'
        )
    deletes = cliutils.variable_deletes(args.variables)
    variables = cc.cells.get(cell_id).variables
    response = variables.delete(*deletes)
    print("Variables {0} deleted.".
          format('successfully' if response else 'not'))