import os
import json
from pathlib import Path
from utils.device_id import get_device_id


# 基础配置
class Settings:
    def __init__(self):
        # 1. 检测环境
        self.is_development = Path(".env.development").exists()
        self.env = "development" if self.is_development else "production"
        print(f"🎯 当前环境: {self.env}")

        # 2. 加载配置文件
        self._load_env_file()

        # API配置
        self.DEEPSEEK_API_KEY = self._get_api_key()
        self.DEEPSEEK_BASE_URL = os.getenv(
            "DEEPSEEK_BASE_URL", "https://api.deepseek.com/v1"
        )

        # KMS配置
        self.KMS_LIST_URL = os.getenv(
            "KMS_LIST_URL", "http://kms.longjoe.com:82/KMS/api/common/DocListAi"
        )
        self.KMS_VIEW_URL = os.getenv(
            "KMS_VIEW_URL", "http://kms.longjoe.com:82/KMS/api/common/DocViewAi"
        )

        # 其他配置
        self.LLM_MODEL = "deepseek-chat"
        self.LLM_TEMPERATURE = 0.7
        self.LLM_MAX_TOKENS = 2048

    def _load_env_file(self):
        """加载对应的.env文件"""
        from dotenv import load_dotenv

        env_file = ".env.development" if self.is_development else ".env"

        if Path(env_file).exists():
            load_dotenv(env_file, override=True)
            print(f"📁 加载配置文件: {env_file}")
        else:
            print(f"⚠️  配置文件 {env_file} 不存在")

    def _get_api_key(self) -> str:
        """根据环境获取API Key"""
        if self.is_development:
            # 开发环境：使用明文
            key = os.getenv("DEEPSEEK_API_KEY")
            if not key:
                print("\n⚠️  开发环境提示:")
                print("   请在 .env.development 中添加:")
                print("   DEEPSEEK_API_KEY=sk-your-key-here")
                print("=" * 40)
            return key or ""
        else:
            # 生产环境：必须使用加密
            encrypted_key = os.getenv("ENCRYPTED_DEEPSEEK_KEY")
            if not encrypted_key:
                raise ValueError("生产环境需要 ENCRYPTED_DEEPSEEK_KEY")

            master_key = "ialwayslovelongjoe"

            return self._decrypt_key(encrypted_key, master_key)

    def _decrypt_key(self, encrypted_key: str, master_key: str) -> str:
        """解密API Key"""
        # 简单版AES解密
        from Crypto.Cipher import AES
        from Crypto.Util.Padding import unpad
        import base64
        import hashlib

        try:
            # 生成密钥
            aes_key = hashlib.sha256(master_key.encode()).digest()
            iv = hashlib.md5(master_key.encode()).digest()

            # 解密
            cipher = AES.new(aes_key, AES.MODE_CBC, iv)
            ct = base64.b64decode(encrypted_key)
            pt = unpad(cipher.decrypt(ct), AES.block_size)

            data = json.loads(pt.decode("utf-8"))

            # 验证设备ID
            if data.get("device_code", "") != get_device_id():
                raise ValueError("设备ID不匹配,APIKEY无效,请联系软件公司")

            return data.get("api_key", "")
        except Exception as e:
            raise ValueError(f"解密失败: {e}")


# 创建全局实例
settings = Settings()