import pathlib

import pytest
from pytest import raises
from teal.db import MultipleResourcesFound, ResourceNotFound, UniqueViolation
from teal.marshmallow import ValidationError

from ereuse_devicehub.client import UserClient
from ereuse_devicehub.db import db
from ereuse_devicehub.devicehub import Devicehub
from ereuse_devicehub.resources.agent.models import Organization
from ereuse_devicehub.resources.device.models import Desktop, Device
from ereuse_devicehub.resources.enums import ComputerChassis
from ereuse_devicehub.resources.tag import Tag
from ereuse_devicehub.resources.tag.view import CannotCreateETag, LinkedToAnotherDevice, \
    TagNotLinked
from tests import conftest


@pytest.mark.usefixtures(conftest.app_context.__name__)
def test_create_tag():
    """Creates a tag specifying a custom organization."""
    org = Organization(name='Bar', tax_id='BarTax')
    tag = Tag(id='bar-1', org=org)
    db.session.add(tag)
    db.session.commit()


@pytest.mark.usefixtures(conftest.app_context.__name__)
def test_create_tag_default_org():
    """Creates a tag using the default organization."""
    tag = Tag(id='foo-1')
    assert not tag.org_id, 'org-id is set as default value so it should only load on flush'
    # We don't want the organization to load, or it would make this
    # object, from transient to new (added to session)
    assert 'org' not in vars(tag), 'Organization should not have been loaded'
    db.session.add(tag)
    db.session.commit()
    assert tag.org.name == 'FooOrg'  # as defined in the settings


@pytest.mark.usefixtures(conftest.app_context.__name__)
def test_create_tag_no_slash():
    """Checks that no tags can be created that contain a slash."""
    with raises(ValidationError):
        Tag('/')

    with raises(ValidationError):
        Tag('bar', secondary='/')


@pytest.mark.usefixtures(conftest.app_context.__name__)
def test_create_two_same_tags():
    """Ensures there cannot be two tags with the same ID and organization."""
    db.session.add(Tag(id='foo-bar'))
    db.session.add(Tag(id='foo-bar'))
    with raises(UniqueViolation):
        db.session.commit()
    db.session.rollback()
    # And it works if tags are in different organizations
    db.session.add(Tag(id='foo-bar'))
    org2 = Organization(name='org 2', tax_id='tax id org 2')
    db.session.add(Tag(id='foo-bar', org=org2))
    db.session.commit()


def test_tag_post(app: Devicehub, user: UserClient):
    """Checks the POST method of creating a tag."""
    user.post({'id': 'foo'}, res=Tag)
    with app.app_context():
        assert Tag.query.filter_by(id='foo').one()


def test_tag_post_etag(user: UserClient):
    """
    Ensures users cannot create eReuse.org tags through POST;
    only terminal.
    """
    user.post({'id': 'FO-123456'}, res=Tag, status=CannotCreateETag)
    # Although similar, these are not eTags and should pass
    user.post({'id': 'FO-0123-45'}, res=Tag)
    user.post({'id': 'FOO012345678910'}, res=Tag)
    user.post({'id': 'FO'}, res=Tag)
    user.post({'id': 'FO-'}, res=Tag)
    user.post({'id': 'FO-123'}, res=Tag)
    user.post({'id': 'FOO-123456'}, res=Tag)


def test_tag_get_device_from_tag_endpoint(app: Devicehub, user: UserClient):
    """Checks getting a linked device from a tag endpoint"""
    with app.app_context():
        # Create a pc with a tag
        tag = Tag(id='foo-bar')
        pc = Desktop(serial_number='sn1', chassis=ComputerChassis.Tower)
        pc.tags.add(tag)
        db.session.add(pc)
        db.session.commit()
    computer, _ = user.get(res=Tag, item='foo-bar/device')
    assert computer['serialNumber'] == 'sn1'


def test_tag_get_device_from_tag_endpoint_no_linked(app: Devicehub, user: UserClient):
    """As above, but when the tag is not linked."""
    with app.app_context():
        db.session.add(Tag(id='foo-bar'))
        db.session.commit()
    user.get(res=Tag, item='foo-bar/device', status=TagNotLinked)


def test_tag_get_device_from_tag_endpoint_no_tag(user: UserClient):
    """As above, but when there is no tag with such ID."""
    user.get(res=Tag, item='foo-bar/device', status=ResourceNotFound)


def test_tag_get_device_from_tag_endpoint_multiple_tags(app: Devicehub, user: UserClient):
    """
    As above, but when there are two tags with the same ID, the
    system should not return any of both (to be deterministic) so
    it should raise an exception.
    """
    with app.app_context():
        db.session.add(Tag(id='foo-bar'))
        org2 = Organization(name='org 2', tax_id='tax id org 2')
        db.session.add(Tag(id='foo-bar', org=org2))
        db.session.commit()
    user.get(res=Tag, item='foo-bar/device', status=MultipleResourcesFound)


def test_tag_create_tags_cli(app: Devicehub, user: UserClient):
    """Checks creating tags with the CLI endpoint."""
    runner = app.test_cli_runner()
    runner.invoke(args=['create-tag', 'id1'], catch_exceptions=False)
    with app.app_context():
        tag = Tag.query.one()  # type: Tag
        assert tag.id == 'id1'
        assert tag.org.id == Organization.get_default_org_id()


def test_tag_manual_link(app: Devicehub, user: UserClient):
    """Tests linking manually a tag through PUT /tags/<id>/device/<id>"""
    with app.app_context():
        db.session.add(Tag('foo-bar', secondary='foo-sec'))
        desktop = Desktop(serial_number='foo', chassis=ComputerChassis.AllInOne)
        db.session.add(desktop)
        db.session.commit()
        desktop_id = desktop.id
    user.put({}, res=Tag, item='foo-bar/device/{}'.format(desktop_id), status=204)
    device, _ = user.get(res=Device, item=1)
    assert device['tags'][0]['id'] == 'foo-bar'

    # Device already linked
    # Just returns an OK to conform to PUT as anything changes
    user.put({}, res=Tag, item='foo-sec/device/{}'.format(desktop_id), status=204)

    # cannot link to another device when already linked
    user.put({}, res=Tag, item='foo-bar/device/99', status=LinkedToAnotherDevice)


@pytest.mark.usefixtures(conftest.app_context.__name__)
def test_tag_secondary():
    """Creates and consumes tags with a secondary id."""
    t = Tag('foo', secondary='bar')
    db.session.add(t)
    db.session.flush()
    assert Tag.from_an_id('bar').one() == t
    assert Tag.from_an_id('foo').one() == t
    with pytest.raises(ResourceNotFound):
        Tag.from_an_id('nope').one()


def test_tag_create_tags_cli_csv(app: Devicehub, user: UserClient):
    """Checks creating tags with the CLI endpoint using a CSV."""
    csv = pathlib.Path(__file__).parent / 'files' / 'tags-cli.csv'
    runner = app.test_cli_runner()
    runner.invoke(args=['create-tags-csv', str(csv)],
                  catch_exceptions=False)
    with app.app_context():
        t1 = Tag.from_an_id('id1').one()
        t2 = Tag.from_an_id('sec1').one()
        assert t1 == t2


def test_tag_multiple_secondary_org(user: UserClient):
    """Ensures two secondary ids cannot be part of the same Org."""
    user.post({'id': 'foo', 'secondary': 'bar'}, res=Tag)
    user.post({'id': 'foo1', 'secondary': 'bar'}, res=Tag, status=UniqueViolation)