# spider_config.py 修改后
import os
from urllib.parse import urljoin
import yaml
from core.utils.path_utils import spiders_config_path
from core.models.spiders_config_models import PlatformConfig


class SpiderConfig:
    _config = None
    _config_path = spiders_config_path

    @classmethod
    def _load_yaml(cls):
        if not os.path.exists(cls._config_path):
            raise FileNotFoundError(f"[配置错误] 找不到配置文件: {cls._config_path}")

        with open(cls._config_path, "r", encoding="utf-8") as f:
            cls._config = yaml.safe_load(f)

    @classmethod
    def get_platform_config(cls, classname: str) -> PlatformConfig:
        if cls._config is None:
            cls._load_yaml()

        if classname not in cls._config:
            raise ValueError(f"[配置错误] 未找到平台配置: {classname}")

        platform_config = cls._config.get(classname, {})
        base_config = cls._config.get("default", {})

        # 合并配置
        merged = {**base_config, **platform_config}

        # 自动拼接完整 url
        if "url" not in merged and "base_url" in merged and "path" in merged:
            merged["url"] = urljoin(merged["base_url"], merged["path"])

        try:
            # Pydantic 2.x 直接实例化
            return PlatformConfig(**merged)
        except Exception as e:
            raise ValueError(f"[配置错误] 平台 {classname} 的配置验证失败: {e}")

    @classmethod
    def reload_config(cls):
        cls._config = None
        cls._load_yaml()

    @classmethod
    def list_all_platforms(cls):
        if cls._config is None:
            cls._load_yaml()
        return [key for key in cls._config.keys() if key != "default"]

    @classmethod
    def get_config_stats(cls):
        if cls._config is None:
            cls._load_yaml()
        return {
            "total_platforms": len(cls.list_all_platforms()),
            "last_modified": os.path.getmtime(cls._config_path) if os.path.exists(cls._config_path) else 0,
            "config_file": cls._config_path
        }