from pathlib import Path

from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    app_base_url: str = Field(default="http://localhost:8080", alias="APP_BASE_URL")
    livekit_url: str = Field(default="ws://livekit:7880", alias="LIVEKIT_URL")
    livekit_public_url: str = Field(default="ws://localhost:7880", alias="LIVEKIT_PUBLIC_URL")
    livekit_api_key: str = Field(default="devkey", alias="LIVEKIT_API_KEY")
    livekit_api_secret: str = Field(default="secret", alias="LIVEKIT_API_SECRET")
    call_token_ttl_hours: int = Field(default=2, alias="CALL_TOKEN_TTL_HOURS")
    room_empty_timeout_seconds: int = Field(default=600, alias="ROOM_EMPTY_TIMEOUT_SECONDS")
    max_attachment_size_mb: int = Field(default=100, alias="MAX_ATTACHMENT_SIZE_MB")
    uploads_dir: str = Field(default="uploads", alias="UPLOADS_DIR")
    block_probe_paths: bool = Field(default=True, alias="BLOCK_PROBE_PATHS")
    cors_allow_origins: str = Field(default="", alias="CORS_ALLOW_ORIGINS")
    turn_urls: str = Field(default="", alias="TURN_URLS")
    turn_username: str = Field(default="", alias="TURN_USERNAME")
    turn_credential: str = Field(default="", alias="TURN_CREDENTIAL")

    model_config = SettingsConfigDict(case_sensitive=False, extra="ignore")

    @property
    def max_attachment_size_bytes(self) -> int:
        return self.max_attachment_size_mb * 1024 * 1024

    @property
    def uploads_path(self) -> Path:
        return Path(self.uploads_dir)

    @property
    def cors_origins(self) -> list[str]:
        raw = getattr(self, 'cors_allow_origins', '')
        return [origin.strip() for origin in raw.split(',') if origin.strip()]

    @property
    def turn_ice_servers(self) -> list[dict[str, str | list[str]]]:
        urls = [url.strip() for url in self.turn_urls.split(',') if url.strip()]
        if not urls or not self.turn_username.strip() or not self.turn_credential.strip():
            return []
        return [
            {
                'urls': urls,
                'username': self.turn_username.strip(),
                'credential': self.turn_credential.strip(),
            }
        ]


settings = Settings()