from pydantic import BaseSettings, Field, validator, BaseModel
from typing import Dict, Any, Optional, List


class DatabaseConfig(BaseSettings):
    """数据库配置"""
    host: str = Field(..., env="DB_HOST")
    port: int = Field(..., env="DB_PORT")
    user: str = Field(..., env="DB_USER")
    password: str = Field(..., env="DB_PASSWORD")
    db: str = Field(..., env="DB_NAME")
    charset: str = Field("utf8mb4", env="DB_CHARSET")

    class Config:
        env_file = ".env"
        env_file_encoding = "utf-8"


class RocketMQConfig(BaseSettings):
    """阿里云 RocketMQ 配置"""
    endpoint: str = Field(..., env="ROCKETMQ_ENDPOINT")
    access_key_id: str = Field(..., env="ROCKETMQ_ACCESS_KEY_ID")
    access_key_secret: str = Field(..., env="ROCKETMQ_ACCESS_KEY_SECRET")
    instance_id: str = Field(..., env="ROCKETMQ_INSTANCE_ID")
    wait_seconds: int = Field(10, env="ROCKETMQ_WAIT_SECONDS")
    batch: int = Field(1, env="ROCKETMQ_BATCH")

    class Config:
        env_file = ".env"


class GlobalConfig(BaseSettings):
    """全局配置"""
    env: str = Field("prod", env="ENV")
    base_url: str = Field("https://api.production.com", env="BASE_URL")
    request_timeout: int = Field(30, env="REQUEST_TIMEOUT")
    log_level: str = Field("INFO", env="LOG_LEVEL")
    enable_aliyun_log: bool = Field(True, env="ENABLE_ALIYUN_LOG")

    class Config:
        env_file = ".env"


class ResponseParse(BaseModel):
    """数据解析配置"""
    next_cursor: str = Field(..., description="下一页游标路径")
    data_path: str = Field(..., description="数据主体路径")
    fields: Dict[str, str] = Field(..., description="字段映射规则")


class PlatformConfig(BaseModel):
    """平台配置"""
    platform: str
    mode: str
    path: str
    method: str = "POST"
    request_body: Dict[str, Any] = {}
    loop_times: int = 1
    loop_interval: int = 0
    response_parse: ResponseParse
    etl_hook: Optional[str] = None
    post_actions: Optional[List[PostAction]] = None

    @validator("etl_hook", pre=True)
    def resolve_etl_hook(cls, v):
        """动态加载钩子函数"""
        if not v:
            return None
        module_name, func_name = v.rsplit(".", 1)
        return getattr(importlib.import_module(module_name), func_name)


class SpiderConfig(BaseModel):
    """全局配置容器"""
    default: dict = Field(...)  # 全局默认配置
    platforms: Dict[str, PlatformConfig] = {}

    @classmethod
    def load(cls):
        """从 YAML 加载配置"""
        with open("config/config.yaml") as f:
            raw_config = yaml.safe_load(f)
        return cls(
            default=raw_config["default"],
            platforms=raw_config["platforms"]
        )


class SpiderConfig(BaseSettings):
    """全局配置容器"""
    default: GlobalConfig
    database: DatabaseConfig
    mq: RocketMQConfig

    class Config:
        env_file = ".env"
        env_prefix = "SPIDER_"  # 环境变量前缀
        case_sensitive = False  # 环境变量不区分大小写