"""中心化配置模块 —— 读取项目根目录 env.yaml，Pydantic 校验导出强类型配置对象。"""

from pathlib import Path
from typing import Literal

import yaml
from pydantic import BaseModel, Field


class DbConfig(BaseModel):
    """TimescaleDB / PostgreSQL 连接参数"""

    host: str = "localhost"
    port: int = Field(default=5432, ge=1, le=65535)
    name: str
    user: str
    password: str


class RedisConfig(BaseModel):
    """Redis 连接配置"""

    url: str = "redis://localhost:6379"
    publish_enabled: bool = True


class LoggingConfig(BaseModel):
    """日志配置"""

    level: Literal["trace", "debug", "info", "warn", "error", "fatal"] = "info"
    node_env: Literal["development", "production"] = "development"


class EnvConfig(BaseModel):
    """env.yaml 顶层结构"""

    db: DbConfig
    redis: RedisConfig
    logging: LoggingConfig


def _get_project_root() -> Path:
    return Path(__file__).resolve().parent.parent.parent


def _load_yaml_config() -> dict:
    root = _get_project_root()
    yaml_path = root / "env.yaml"

    if not yaml_path.exists():
        raise FileNotFoundError(
            f"[config] 无法读取配置文件: {yaml_path}\n"
            f"请确保项目根目录存在 env.yaml。"
        )

    with open(yaml_path, "r", encoding="utf-8") as f:
        data = yaml.safe_load(f)

    if data is None:
        raise ValueError(f"[config] env.yaml 解析结果为空: {yaml_path}")

    return data


_raw = _load_yaml_config()
_config = EnvConfig.model_validate(_raw)

db = _config.db
redis = _config.redis
logging = _config.logging

DB_DSN = f"postgresql://{db.user}:{db.password}@{db.host}:{db.port}/{db.name}"


def print_config_summary() -> None:
    """打印脱敏后的配置概要（不含密码明文）"""
    print(f"[config] TimescaleDB: {db.user}@{db.host}:{db.port}/{db.name}")
    print(
        f"[config] Redis: {redis.url.replace('//', '//***@') if '@' in redis.url else redis.url}"
    )
    print(f"[config] Logging: level={logging.level}, env={logging.node_env}")