from flask import current_app as app, jsonify
from flask_sqlalchemy import Pagination
from marshmallow import Schema as MarshmallowSchema
from marshmallow.fields import Float, Integer, Nested, Str
from marshmallow.validate import Range
from sqlalchemy import Column
from teal.query import Between, FullTextSearch, ILike, Join, Or, Query, Sort, SortField
from teal.resource import Resource, View

from ereuse_devicehub.resources.device.models import Device
from ereuse_devicehub.resources.event.models import Rate
from ereuse_devicehub.resources.lot.models import Lot
from ereuse_devicehub.resources.schemas import Thing
from ereuse_devicehub.resources.tag import Tag


class Inventory(Thing):
    pass


class RateQ(Query):
    rating = Between(Rate.rating, Float())
    appearance = Between(Rate.appearance, Float())
    functionality = Between(Rate.functionality, Float())


class TagQ(Query):
    id = Or(ILike(Tag.id), required=True)
    org = ILike(Tag.org)


class OfType(Str):
    def __init__(self, column: Column, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.column = column

    def _deserialize(self, value, attr, data):
        v = super()._deserialize(value, attr, data)
        return self.column.in_(app.resources[v].subresources_types)


class Filters(Query):
    type = Or(OfType(Device.type))
    model = ILike(Device.model)
    manufacturer = ILike(Device.manufacturer)
    serialNumber = ILike(Device.serial_number)
    rating = Join(Device.id == Rate.device_id, RateQ)
    tag = Join(Device.id == Tag.id, TagQ)


class Sorting(Sort):
    created = SortField(Device.created)


class InventoryView(View):
    class FindArgs(MarshmallowSchema):
        search = FullTextSearch()  # todo Develop this. See more at docs/inventory.
        filter = Nested(Filters, missing=[])
        sort = Nested(Sorting, missing=[Device.created.desc()])
        page = Integer(validate=Range(min=1), missing=1)

    def get(self, id):
        """Inventory view
        ---
        description: Supports the inventory view of ``devicehub-client``; returns
                     all the devices, groups and widgets of this Devicehub instance.
        responses:
          200:
            description: The inventory.
            schema:
              type: object
              properties:
                devices:
                  type: array
                  items:
                    $ref: '#/definitions/Device'
                pagination:
                  type: object
                  properties:
                    page:
                      type: integer
                      minimum: 0
                    perPage:
                      type: integer
                      minimum: 0
                    total:
                      type: integer
                      minimum: 0
        """
        # todo .format(yaml.load(schema2parameters(self.FindArgs, default_in='path', name='path')))
        return super().get(id)

    def find(self, args: dict):
        """See :meth:`.get` above."""
        devices = Device.query \
            .filter(*args['filter']) \
            .order_by(*args['sort']) \
            .paginate(page=args['page'], per_page=30)  # type: Pagination
        inventory = {
            'devices': app.resources[Device.t].schema.dump(devices.items, many=True, nested=1),
            'lots': app.resources[Lot.t].schema.dump(Lot.roots(), many=True, nested=1),
            'widgets': {},
            'pagination': {
                'page': devices.page,
                'perPage': devices.per_page,
                'total': devices.total,
            }
        }
        return jsonify(inventory)


class InventoryDef(Resource):
    SCHEMA = Inventory
    VIEW = InventoryView
    AUTH = True