from pydantic import field_validator
from pydantic_settings import BaseSettings, SettingsConfigDict
from pathlib import Path
import os


class Config(BaseSettings):
    """Points system configuration."""

    model_config = SettingsConfigDict(
        extra="ignore",
    )

    # 数据库配置
    POINTS_DB_FILE: str = os.getenv("DANDING_POINTS_DB_FILE", "data/danding_points/points.db")
    POINTS_MAX_BALANCE: int = int(os.getenv("DANDING_POINTS_MAX_BALANCE", "0"))
    POINTS_MAX_PER_OPERATION: int = int(os.getenv("DANDING_POINTS_MAX_PER_OPERATION", "0"))
    POINTS_LOG_RETENTION_DAYS: int = int(os.getenv("DANDING_POINTS_LOG_RETENTION_DAYS", "365"))

    @field_validator("POINTS_MAX_BALANCE", "POINTS_MAX_PER_OPERATION", "POINTS_LOG_RETENTION_DAYS")
    @classmethod
    def validate_non_negative(cls, v):
        if v < 0:
            raise ValueError("Value must be non-negative")
        return v

    @field_validator("POINTS_DB_FILE")
    @classmethod
    def validate_db_path(cls, v):
        if not v:
            raise ValueError("Database file path cannot be empty")
        return v