"""
Configuration definition.

Converts per-run (environment) variables and config files into the
"python world" using `pydantic`.

Pydantic models might have convenience methods attached.
"""

from typing import Any

from pydantic import BaseModel, model_validator
from pydantic_settings import BaseSettings, SettingsConfigDict


class DAVSettings(BaseModel):
    """
    Connection to a DAV server.
    """

    protocol: str | None = None
    host: str | None = None
    path: str | None = None

    username: str | None = None
    password: str | None = None

    cache_ttl: int = 60 * 30
    cache_size: int = 1024

    @property
    def url(self) -> str:
        """
        Combined DAV URL.
        """

        return f"{self.protocol}://{self.host}{self.path}"


class WebDAVSettings(DAVSettings):
    """
    Connection to a WebDAV server.
    """

    protocol: str = "https"
    host: str = "example.com"
    path: str = "/remote.php/dav"
    prefix: str = "/ovdashboard"

    username: str = "ovd_user"
    password: str = "password"

    config_filename: str = "config.txt"

    disable_check: bool = False
    retries: int = 20
    retry_delay: int = 30
    prefix: str = "/ovdashboard"

    @property
    def url(self) -> str:
        """
        Combined DAV URL.
        """

        return f"{self.protocol}://{self.host}{self.path}{self.prefix}"


class Settings(BaseSettings):
    """
    Per-run settings.
    """

    model_config = SettingsConfigDict(
        env_file=".env",
        env_file_encoding="utf-8",
        env_nested_delimiter="__",
    )

    #####
    # general settings
    #####

    log_level: str = "INFO"
    production_mode: bool = False
    ui_directory: str = "/usr/local/share/ovdashboard_ui/html"

    # doesn't even have to be reachable
    ping_host: str = "1.0.0.0"
    ping_port: int = 1

    #####
    # openapi settings
    #####

    def __dev_value[T](self, value: T) -> T | None:
        if self.production_mode:
            return None

        return value

    @property
    def openapi_url(self) -> str | None:
        return self.__dev_value("/api/openapi.json")

    @property
    def docs_url(self) -> str | None:
        return self.__dev_value("/api/docs")

    @property
    def redoc_url(self) -> str | None:
        return self.__dev_value("/api/redoc")

    #####
    # webdav settings
    #####

    webdav: WebDAVSettings = WebDAVSettings()

    #####
    # caldav settings
    #####

    caldav: DAVSettings = DAVSettings()

    @model_validator(mode='before')
    @classmethod
    def validate_dav_settings(cls, data) -> dict[str, Any]:
        assert isinstance(data, dict)

        # ensure both settings dicts are created
        for key in ("webdav", "caldav"):
            if key not in data:
                data[key] = {}

        default_dav = DAVSettings(
            protocol="https",
            host="example.com",
            username="ovdashboard",
            password="secret",
        ).model_dump()

        for key in default_dav:
            # if "webdav" value is not specified, use default
            if key not in data["webdav"] or data["webdav"][key] is None:
                data["webdav"][key] = default_dav[key]

            # if "caldav" value is not specified, use "webdav" value
            if key not in data["caldav"] or data["caldav"][key] is None:
                data["caldav"][key] = data["webdav"][key]

        # add default "path"s if None
        if data["webdav"]["path"] is None:
            data["webdav"]["path"] = "/remote.php/webdav"

        if data["caldav"]["path"] is None:
            data["caldav"]["path"] = "/remote.php/dav"

        return data


SETTINGS = Settings()