import os
from functools import lru_cache
from typing import Annotated, Any

from pydantic import Field, field_validator
from pydantic_settings import BaseSettings, NoDecode, SettingsConfigDict

from surugaya_common import redis_keys

# 根据 APP_ENV 确定环境配置文件（默认为 dev）
APP_ENV = os.getenv("APP_ENV", "dev").lower()
ENV_FILE = f".env.{APP_ENV}"

class Settings(BaseSettings):
    """
    全局应用配置模型。
    使用 pydantic-settings 校验类型并自动解析复杂数据类型。
    """
    # 运行环境
    app_env: str = Field(default="dev", alias="APP_ENV")

    # 日志配置
    log_level: str = Field(default="INFO", alias="LOG_LEVEL")
    log_dir: str = Field(default="./logs", alias="LOG_DIR")

    # 节点配置
    node_id: str = Field(default="node_1", alias="NODE_ID")

    # Redis 配置
    redis_host: str = Field(default="127.0.0.1", alias="REDIS_HOST")
    redis_port: int = Field(default=6379, alias="REDIS_PORT")
    redis_password: str | None = Field(default=None, alias="REDIS_PASSWORD")
    redis_db: int = Field(default=0, alias="REDIS_DB")
    redis_stream_key: str = Field(default=redis_keys.PURCHASE_TASK_STREAM, alias="REDIS_STREAM_KEY")
    redis_consumer_group: str = Field(default="surugaya_purchase_task_group", alias="REDIS_CONSUMER_GROUP")
    redis_consumer_name: str = Field(default="surugaya_purchase_task_worker", alias="REDIS_CONSUMER_NAME")
    redis_delay_zset_key: str = Field(default=redis_keys.TRADE_DELAY_ZSET, alias="REDIS_DELAY_ZSET_KEY")
    redis_delay_poll_interval: int = Field(default=3600, alias="REDIS_DELAY_POLL_INTERVAL")
    redis_delay_batch_size: int = Field(default=10, alias="REDIS_DELAY_BATCH_SIZE")

 
    # 浏览器控制
    browser_headless: bool = Field(default=True, alias="BROWSER_HEADLESS")
    browser_executable_path: str | None = Field(default=None, alias="BROWSER_EXECUTABLE_PATH")
    browser_keep_open: bool = Field(default=False, alias="BROWSER_KEEP_OPEN")

    # 配置与资源路径
    accounts_config_path: str = Field(default="./accounts.yaml", alias="ACCOUNTS_CONFIG_PATH")
    screenshot_dir: str = Field(default="./archives", alias="SCREENSHOT_DIR")

    # 任务上报配置
    callback_url: str | None = Field(default=None, alias="CALLBACK_URL")
    appid: str | None = Field(default=None, alias="APPID")
    app_secret: str | None = Field(default=None, alias="APP_SECRET")

    # PayPay 配置
    paypay_phone: str | None = Field(default=None, alias="PAYPAY_PHONE")
    paypay_password: str | None = Field(default=None, alias="PAYPAY_PASSWORD")

    # 通知配置
    notify_enabled: bool = Field(default=False, alias="NOTIFY_ENABLED")
    notify_channels: Annotated[list[str], NoDecode] = Field(
        default_factory=lambda: ["email"],
        alias="NOTIFY_CHANNELS",
    )
    notify_on_task_failed: bool = Field(default=True, alias="NOTIFY_ON_TASK_FAILED")

    # 邮件通知配置
    mail_enabled: bool = Field(default=True, alias="MAIL_ENABLED")
    mail_smtp_host: str | None = Field(default=None, alias="MAIL_SMTP_HOST")
    mail_smtp_port: int = Field(default=465, alias="MAIL_SMTP_PORT")
    mail_smtp_use_ssl: bool = Field(default=True, alias="MAIL_SMTP_USE_SSL")
    mail_smtp_starttls: bool = Field(default=False, alias="MAIL_SMTP_STARTTLS")
    mail_username: str | None = Field(default=None, alias="MAIL_USERNAME")
    mail_password: str | None = Field(default=None, alias="MAIL_PASSWORD")
    mail_from_address: str | None = Field(default=None, alias="MAIL_FROM_ADDRESS")
    mail_from_name: str = Field(default="JP Purchase Bot", alias="MAIL_FROM_NAME")
    mail_to_addresses: Annotated[list[str], NoDecode] = Field(
        default_factory=list,
        alias="MAIL_TO_ADDRESSES",
    )
    mail_subject_prefix: str = Field(default="[JP-Purchase]", alias="MAIL_SUBJECT_PREFIX")
    mail_timeout_seconds: int = Field(default=10, alias="MAIL_TIMEOUT_SECONDS")

    @field_validator("notify_channels", "mail_to_addresses", mode="before")
    @classmethod
    def _parse_csv_list(cls, value: Any) -> list[str]:
        if value is None:
            return []

        if isinstance(value, str):
            return [item.strip() for item in value.split(",") if item.strip()]

        if isinstance(value, (list, tuple, set)):
            return [str(item).strip() for item in value if str(item).strip()]

        return [str(value).strip()] if str(value).strip() else []

    # Pydantic Settings 配置项
    model_config = SettingsConfigDict(
        env_file=ENV_FILE,
        env_file_encoding="utf-8",
        extra="ignore"  # 忽略其他系统环境变量
    )

@lru_cache
def get_settings() -> Settings:
    """
    获取缓存的全局配置单例。
    """
    return Settings()