"""All configuration via environment.

Take note of the environment variable prefixes required for each
settings class, except `AppSettings`.
"""
from typing import Literal, Optional, Union

__all__ = [
    "APISettings",
    "AppSettings",
    "DatabaseSettings",
    "EmailSettings",
    "OpenAPISettings",
    "ServerSettings",
]

from pydantic import Extra
from pydantic_settings import BaseSettings


class BaseEnvSettings(BaseSettings):
    class Config:
        env_file = ".env"
        env_file_encoding = "utf-8"
        extra = Extra.ignore


class AppSettings(BaseEnvSettings):
    class Config:
        case_sensitive = True

    BUILD_NUMBER: str = "0"
    DEBUG: bool = False
    ENVIRONMENT: str = "local"
    LOG_LEVEL: str = "INFO"
    NAME: str = "addressbook"

    @property
    def slug(self) -> str:
        return "-".join(s.lower() for s in self.NAME.split())


class APISettings(BaseEnvSettings):
    class Config:
        env_prefix = "API_"
        case_sensitive = True

    CACHE_EXPIRATION: int = 60
    DB_SESSION_DEPENDENCY_KEY: str = "db_session"
    DEFAULT_PAGINATION_LIMIT: int = 100
    DEFAULT_USER_NAME: str = "__default_user__"
    HEALTH_PATH: str = "/health"
    SECRET_KEY: str = "abc123"
    USER_DEPENDENCY_KEY: str = "user"


class OpenAPISettings(BaseEnvSettings):
    class Config:
        env_prefix = "OPENAPI_"
        case_sensitive = True

    TITLE: Optional[str] = "My Litestar App"
    VERSION: str = "0.1.0"
    CONTACT_NAME: str = "My Name"
    CONTACT_EMAIL: str = "some_human@some_domain.com"


class DatabaseSettings(BaseEnvSettings):
    class Config:
        env_prefix = "DB_"
        case_sensitive = True

    ECHO: bool = False
    ECHO_POOL: Union[bool, Literal["debug"]] = False
    POOL_DISABLE: bool = False
    POOL_MAX_OVERFLOW: int = 10
    POOL_SIZE: int = 5
    POOL_TIMEOUT: int = 30
    HOST: str = "localhost"
    PORT: int = 5432
    NAME: str = "db-name"
    USER: str = "db-user"
    PASSWORD: str = "db-password"
    FLYWAY_PATH: str = "/usr/local/bin/flyway"


class TestingSettings(BaseEnvSettings):
    class Config:
        env_prefix = "TESTS_"
        case_sensitive = True

    DB_HOST: str = "localhost"
    DB_PORT: int = 5432
    DB_NAME: str = "test_db-name"
    DB_USER: str = "db-user"
    DB_PASSWORD: str = "db-password"
    DROP_DATABASE_BEFORE_TESTS = True
    DROP_DATABASE_AFTER_TESTS = True


class ServerSettings(BaseEnvSettings):
    class Config:
        env_prefix = "UVICORN_"
        case_sensitive = True

    HOST: str = "localhost"
    LOG_LEVEL: str = "info"
    PORT: int = 8000
    RELOAD: bool = True
    KEEPALIVE: int = 65


class EmailSettings(BaseEnvSettings):
    class Config:
        env_prefix = "EMAIL_"
        case_sensitive = True


# `.parse_obj()` thing is a workaround for pyright and pydantic interplay, see:
# https://github.com/pydantic/pydantic/issues/3753#issuecomment-1087417884
api = APISettings.parse_obj({})
app = AppSettings.parse_obj({})
db = DatabaseSettings.parse_obj({})
openapi = OpenAPISettings.parse_obj({})
server = ServerSettings.parse_obj({})
testing = TestingSettings.parse_obj({})