from typing import Optional

from pydantic import BaseModel

from openapi_pydantic.compat import PYDANTIC_V2, ConfigDict, Extra

_examples = [
    {"name": "Apache 2.0", "identifier": "Apache-2.0"},
    {
        "name": "Apache 2.0",
        "url": "https://www.apache.org/licenses/LICENSE-2.0.html",
    },
]


class License(BaseModel):
    """
    License information for the exposed API.
    """

    name: str
    """
    **REQUIRED**. The license name used for the API.
    """

    identifier: Optional[str] = None
    """
    An [SPDX](https://spdx.org/spdx-specification-21-web-version#h.jxpfx0ykyb60) 
    license expression for the API. The `identifier` field is mutually exclusive of the 
    `url` field.
    """

    url: Optional[str] = None
    """
    A URL to the license used for the API.
    This MUST be in the form of a URL.
    The `url` field is mutually exclusive of the `identifier` field.
    """

    if PYDANTIC_V2:
        model_config = ConfigDict(
            extra="allow",
            json_schema_extra={"examples": _examples},
        )

    else:

        class Config:
            extra = Extra.allow
            schema_extra = {"examples": _examples}