from functools import lru_cache
from pathlib import Path

from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    # 配置统一来自环境变量，保证本地和服务器使用同一套启动路径。
    app_name: str = "SignalScout"
    env: str = "dev"
    database_url: str = Field(
        default="mysql+pymysql://signalscout:signalscout@127.0.0.1:3306/signalscout?charset=utf8mb4"
    )
    llm_base_url: str = "https://api.zayuapi.com/v1"
    llm_api_key: str = ""
    llm_model: str = "grok-4.3"
    llm_timeout_seconds: int = 180
    llm_max_tokens: int = 8000
    news_recent_days: int = 3
    news_max_items: int = 60
    news_search_max_records: int = 100
    github_recent_days: int = 30
    github_min_stars: int = 20
    github_max_projects: int = 40
    agent_timezone: str = "Asia/Shanghai"
    agent_interval_minutes: int = 30
    report_dir: Path = Path("reports")
    log_file: Path = Path("logs/app.log")
    log_tail_lines: int = 200

    model_config = SettingsConfigDict(
        env_file=".env",
        env_prefix="SIGNALSCOUT_",
        extra="ignore",
    )


@lru_cache
def get_settings() -> Settings:
    # Caching prevents repeated env parsing while tests can still clear it if needed.
    return Settings()