import os
import uuid
from typing import Type

import boltons.urlutils
import click
import click_spinner
import ereuse_utils.cli
from ereuse_utils.session import DevicehubClient
from flask import _app_ctx_stack, g
from flask_login import LoginManager, current_user
from flask_sqlalchemy import SQLAlchemy
from flask_wtf.csrf import CSRFProtect
from teal.db import SchemaSQLAlchemy
from teal.teal import Teal

from ereuse_devicehub.auth import Auth
from ereuse_devicehub.client import Client, UserClient
from ereuse_devicehub.config import DevicehubConfig
from ereuse_devicehub.db import db
from ereuse_devicehub.dummy.dummy import Dummy
from ereuse_devicehub.resources.device.search import DeviceSearch
from ereuse_devicehub.resources.inventory import Inventory, InventoryDef
from ereuse_devicehub.resources.user.models import User
from ereuse_devicehub.templating import Environment


class Devicehub(Teal):
    test_client_class = Client
    Dummy = Dummy
    jinja_environment = Environment

    def __init__(self,
                 inventory: str,
                 config: DevicehubConfig = DevicehubConfig(),
                 db: SQLAlchemy = db,
                 import_name=__name__.split('.')[0],
                 static_url_path=None,
                 static_folder='static',
                 static_host=None,
                 host_matching=False,
                 subdomain_matching=False,
                 template_folder='templates',
                 instance_path=None,
                 instance_relative_config=False,
                 root_path=None,
                 Auth: Type[Auth] = Auth):
        assert inventory
        super().__init__(config, db, inventory, import_name, static_url_path, static_folder,
                         static_host,
                         host_matching, subdomain_matching, template_folder, instance_path,
                         instance_relative_config, root_path, False, Auth)
        self.id = inventory
        """The Inventory ID of this instance. In Teal is the app.schema."""
        self.dummy = Dummy(self)

        @self.cli.group(short_help='Inventory management.',
                        help='Manages the inventory {}.'.format(os.environ.get('dhi')))
        def inv():
            pass

        inv.command('add')(self.init_db)
        inv.command('del')(self.delete_inventory)
        inv.command('search')(self.regenerate_search)
        self.before_request(self._prepare_request)

        self.configure_extensions()

    def configure_extensions(self):
        # configure & enable CSRF of Flask-WTF
        CSRFProtect(self)

        # configure Flask-Login
        login_manager = LoginManager()
        login_manager.init_app(self)

        @login_manager.user_loader
        def load_user(user_id):
            return User.query.get(user_id)

    # noinspection PyMethodOverriding
    @click.option('--name', '-n',
                  default='Test 1',
                  help='The human name of the inventory.')
    @click.option('--org-name', '-on',
                  default='My Organization',
                  help='The name of the default organization that owns this inventory.')
    @click.option('--org-id', '-oi',
                  default='foo-bar',
                  help='The Tax ID of the organization.')
    @click.option('--tag-url', '-tu',
                  type=ereuse_utils.cli.URL(scheme=True, host=True, path=False),
                  default='http://example.com',
                  help='The base url (scheme and host) of the tag provider.')
    @click.option('--tag-token', '-tt',
                  type=click.UUID,
                  default='899c794e-1737-4cea-9232-fdc507ab7106',
                  help='The token provided by the tag provider. It is an UUID.')
    @click.option('--erase/--no-erase',
                  default=False,
                  help='Delete the schema before? '
                       'If --common is set this includes the common database.')
    @click.option('--common/--no-common',
                  default=False,
                  help='Creates common databases. Only execute if the database is empty.')
    def init_db(self, name: str,
                org_name: str,
                org_id: str,
                tag_url: boltons.urlutils.URL,
                tag_token: uuid.UUID,
                erase: bool,
                common: bool):
        """Creates an inventory.

        This creates the database and adds the inventory to the
        inventory tables with the passed-in settings, and does nothing if the
        inventory already exists.

        After you create the inventory you might want to create an user
        executing *dh user add*.
        """
        assert _app_ctx_stack.top, 'Use an app context.'
        print('Initializing database...'.ljust(30), end='')
        with click_spinner.spinner():
            if erase:
                self.db.drop_all(common_schema=common)
            assert not db.has_schema(self.id), 'Schema {} already exists.'.format(self.id)
            exclude_schema = 'common' if not common else None
            self._init_db(exclude_schema=exclude_schema)
            InventoryDef.set_inventory_config(name, org_name, org_id, tag_url, tag_token)
            DeviceSearch.set_all_devices_tokens_if_empty(self.db.session)
            self._init_resources(exclude_schema=exclude_schema)
            self.db.session.commit()
        print('done.')

    def _init_db(self, exclude_schema=None) -> bool:
        if exclude_schema:
            assert isinstance(self.db, SchemaSQLAlchemy)
            self.db.create_all(exclude_schema=exclude_schema)
        else:
            self.db.create_all()

        return True

    @click.confirmation_option(prompt='Are you sure you want to delete the inventory {}?'
                               .format(os.environ.get('dhi')))
    def delete_inventory(self):
        """Erases an inventory.

        This removes its private database and its entry in the common
        inventory.

        This deletes users that have only access to this inventory.
        """
        InventoryDef.delete_inventory()
        self.db.session.commit()
        self.db.drop_all(common_schema=False)

    def regenerate_search(self):
        """Re-creates from 0 all the search tables."""
        DeviceSearch.regenerate_search_table(self.db.session)
        db.session.commit()
        print('Done.')

    def _prepare_request(self):
        """Prepares request stuff."""
        inv = g.inventory = Inventory.current  # type: Inventory
        g.tag_provider = DevicehubClient(base_url=inv.tag_provider,
                                         token=DevicehubClient.encode_token(inv.tag_token))
        # NOTE: models init methods expects that current user is
        #   available on g.user (e.g. to initialize object owner)
        g.user = current_user

    def create_client(self, email='user@dhub.com', password='1234'):
        client = UserClient(self, email, password, response_wrapper=self.response_class)
        client.login()
        return client