import pytest
from pydantic import BaseModel, ValidationError
from pydantic import Field as PField
from sqlmodel import Field, SQLModel

"""
Alias tests for SQLModel and Pydantic compatibility
"""


class PydanticUser(BaseModel):
    full_name: str = PField(alias="fullName")


class SQLModelUser(SQLModel):
    full_name: str = Field(alias="fullName")


# Models with config (validate_by_name=True)
class PydanticUserWithConfig(PydanticUser):
    model_config = {"validate_by_name": True}


class SQLModelUserWithConfig(SQLModelUser):
    model_config = {"validate_by_name": True}


@pytest.mark.parametrize("model", [PydanticUser, SQLModelUser])
def test_create_with_field_name(model: type[PydanticUser] | type[SQLModelUser]):
    with pytest.raises(ValidationError):
        model(full_name="Alice")


@pytest.mark.parametrize("model", [PydanticUserWithConfig, SQLModelUserWithConfig])
def test_create_with_field_name_with_config(
    model: type[PydanticUserWithConfig] | type[SQLModelUserWithConfig],
):
    user = model(full_name="Alice")
    assert user.full_name == "Alice"


@pytest.mark.parametrize(
    "model",
    [PydanticUser, SQLModelUser, PydanticUserWithConfig, SQLModelUserWithConfig],
)
def test_create_with_alias(
    model: type[PydanticUser]
    | type[SQLModelUser]
    | type[PydanticUserWithConfig]
    | type[SQLModelUserWithConfig],
):
    user = model(fullName="Bob")  # using alias
    assert user.full_name == "Bob"


@pytest.mark.parametrize("model", [PydanticUserWithConfig, SQLModelUserWithConfig])
def test_create_with_both_prefers_alias(
    model: type[PydanticUserWithConfig] | type[SQLModelUserWithConfig],
):
    user = model(full_name="IGNORED", fullName="Charlie")
    assert user.full_name == "Charlie"  # alias should take precedence


@pytest.mark.parametrize("model", [PydanticUser, SQLModelUser])
def test_dict_default_uses_field_names(
    model: type[PydanticUser] | type[SQLModelUser],
):
    user = model(fullName="Dana")
    data = user.model_dump()
    assert "full_name" in data
    assert "fullName" not in data
    assert data["full_name"] == "Dana"


@pytest.mark.parametrize("model", [PydanticUser, SQLModelUser])
def test_dict_by_alias_uses_aliases(
    model: type[PydanticUser] | type[SQLModelUser],
):
    user = model(fullName="Dana")
    data = user.model_dump(by_alias=True)
    assert "fullName" in data
    assert "full_name" not in data
    assert data["fullName"] == "Dana"


@pytest.mark.parametrize("model", [PydanticUser, SQLModelUser])
def test_json_by_alias(
    model: type[PydanticUser] | type[SQLModelUser],
):
    user = model(fullName="Frank")
    json_data = user.model_dump_json(by_alias=True)
    assert ('"fullName":"Frank"' in json_data) or ('"fullName": "Frank"' in json_data)
    assert "full_name" not in json_data


class PydanticUserV2(BaseModel):
    first_name: str = PField(validation_alias="firstName", serialization_alias="f_name")


class SQLModelUserV2(SQLModel):
    first_name: str = Field(validation_alias="firstName", serialization_alias="f_name")


@pytest.mark.parametrize("model", [PydanticUserV2, SQLModelUserV2])
def test_create_with_validation_alias(
    model: type[PydanticUserV2] | type[SQLModelUserV2],
):
    user = model(firstName="John")
    assert user.first_name == "John"


@pytest.mark.parametrize("model", [PydanticUserV2, SQLModelUserV2])
def test_serialize_with_serialization_alias(
    model: type[PydanticUserV2] | type[SQLModelUserV2],
):
    user = model(firstName="Jane")
    data = user.model_dump(by_alias=True)
    assert "f_name" in data
    assert "firstName" not in data
    assert "first_name" not in data
    assert data["f_name"] == "Jane"


def test_schema_extra_validation_alias_sqlmodel_v2():
    class M(SQLModel):
        f: str = Field(schema_extra={"validation_alias": "f_alias"})

    m = M.model_validate({"f_alias": "asd"})
    assert m.f == "asd"


def test_schema_extra_serialization_alias_sqlmodel_v2():
    class M(SQLModel):
        f: str = Field(schema_extra={"serialization_alias": "f_out"})

    m = M(f="x")
    data = m.model_dump(by_alias=True)
    assert "f_out" in data
    assert "f" not in data
    assert data["f_out"] == "x"


def test_alias_plus_validation_alias_prefers_validation_alias_sqlmodel_v2():
    class M(SQLModel):
        first_name: str = Field(alias="fullName", validation_alias="v_name")

    m = M.model_validate({"fullName": "A", "v_name": "B"})
    assert m.first_name == "B"


def test_alias_plus_serialization_alias_prefers_serialization_alias_sqlmodel_v2():
    class M(SQLModel):
        first_name: str = Field(alias="fullName", serialization_alias="f_name")

    m = M(fullName="Z")
    data = m.model_dump(by_alias=True)
    assert "f_name" in data
    assert "fullName" not in data
    assert data["f_name"] == "Z"


def test_alias_generator_works_sqlmodel_v2():
    class M(SQLModel):
        model_config = {"alias_generator": lambda s: "gen_" + s}
        f: str = Field()

    m = M.model_validate({"gen_f": "ok"})
    assert m.f == "ok"
    data = m.model_dump(by_alias=True)
    assert "gen_f" in data and data["gen_f"] == "ok"


def test_alias_generator_with_explicit_alias_prefers_field_alias_sqlmodel_v2():
    class M(SQLModel):
        model_config = {"alias_generator": lambda s: "gen_" + s}
        f: str = Field(alias="custom")

    m = M.model_validate({"custom": "ok"})
    assert m.f == "ok"
    data = m.model_dump(by_alias=True)
    assert "custom" in data and "gen_f" not in data