import os
from dataclasses import dataclass, field
from pathlib import Path


def secret(name: str) -> str:
    path = os.getenv(name + "_FILE")
    return Path(path).read_text().strip() if path else os.getenv(name, "")


@dataclass
class Settings:
    data_dir: Path = field(default_factory=lambda: Path(os.getenv("DATA_DIR", "/data")))
    config_dir: Path = field(
        default_factory=lambda: Path(os.getenv("CONFIG_DIR", "/config"))
    )
    mock: bool = field(
        default_factory=lambda: os.getenv("KOKONNA_MOCK", "true").lower() == "true"
    )
    write_enabled: bool = field(
        default_factory=lambda: (
            os.getenv("KOKONNA_WRITE_ENABLED", "false").lower() == "true"
        )
    )
    api_key: str = field(default_factory=lambda: secret("KOKONNA_API_KEY"), repr=False)
    api_token: str = field(
        default_factory=lambda: secret("FRAME_FLOW_TOKEN"), repr=False
    )
    additional_secrets: list[str] = field(default_factory=list, repr=False)
    storage_name: str = field(
        default_factory=lambda: (
            os.getenv("FRAME_FLOW_STORAGE_NAME", "NAS").strip() or "NAS"
        )
    )
    device_id: str = "living-room"
    timezone: str = "Asia/Shanghai"
    cors_origins: list[str] = field(
        default_factory=lambda: [
            x.strip()
            for x in os.getenv("CORS_ALLOWED_ORIGINS", "").split(",")
            if x.strip()
        ]
    )
    image_url_hosts: list[str] = field(
        default_factory=lambda: [
            x.strip().lower()
            for x in os.getenv("IMAGE_URL_ALLOWED_HOSTS", "").split(",")
            if x.strip()
        ]
    )
    font_path: str = field(
        default_factory=lambda: os.getenv(
            "FONT_PATH", "/usr/share/fonts/opentype/noto/NotoSansCJK-Regular.ttc"
        )
    )
    photo_root: Path = field(
        default_factory=lambda: Path(os.getenv("PHOTO_ROOT", "/photos"))
    )
    photos_cache_bytes: int = field(
        default_factory=lambda: max(
            1024 * 1024,
            int(os.getenv("SYNOLOGY_PHOTOS_CACHE_BYTES", str(256 * 1024 * 1024))),
        )
    )
    max_bytes: int = 20 * 1024 * 1024
    idempotency_hours: int = 168
    sync_timeout: int = 600

    def sanitize(self, value):
        import json

        encoded = json.dumps(value, ensure_ascii=False)
        for key in (self.api_key, self.api_token, *self.additional_secrets):
            if key:
                encoded = encoded.replace(key, "[REDACTED]")
        return json.loads(encoded)