import pytest
from tinydb.storages import MemoryStorage

from grung import examples
from grung.db import GrungDB
from grung.exceptions import PointerReferenceError, UniqueConstraintError


@pytest.fixture
def db():
    _db = GrungDB.with_schema(examples, storage=MemoryStorage)
    yield _db
    print(_db)


def test_crud(db):
    user = examples.User(name="john", number=23, email="john@foo")
    assert user.uid
    assert user._metadata.fields["uid"].unique

    # insert
    john_something = db.save(user)
    last_insert_id = john_something.doc_id

    # read back
    assert db.User.get(doc_id=last_insert_id) == john_something
    assert john_something.name == user.name
    assert john_something.number == 23
    assert john_something.email == user.email
    assert john_something.uid == user.uid

    # update
    john_something.name = "james?"
    before_update = db.User.get(doc_id=john_something.doc_id)
    after_update = db.save(john_something)
    assert after_update == john_something
    assert before_update != after_update

    # delete
    db.delete(john_something)
    assert len(db.User) == 0


def test_pointers(db):
    user = examples.User(name="john", email="john@foo")
    players = examples.Group(name="players", users=[user])

    with pytest.raises(PointerReferenceError):
        players = db.save(players)

    user = db.save(user)

    players.users[0] = user
    players = db.save(players)
    assert players.users[0] == user


def test_unique(db):
    user1 = examples.User(name="john", email="john@foo")
    user2 = examples.User(name="john", email="john@foo")

    user1 = db.save(user1)
    with pytest.raises(UniqueConstraintError):
        user2 = db.save(user2)
    db.save(user1)