from fastapi import HTTPException, status
from sqlalchemy.orm import Session
from models.product import Product
from models.user import User
from utils.r2_uploader import get_r2_uploader, R2Config, get_cached_config, set_cached_config
from models.company_r2_config import CompanyR2Config
from typing import Optional
from dotenv import load_dotenv
from pathlib import Path
import os

# 加载.env文件
BASE_DIR = Path(__file__).parent.parent
load_dotenv(BASE_DIR / ".env")


def get_r2_config_from_env() -> Optional[R2Config]:
    """从.env文件获取R2配置"""
    r2_account_id = os.getenv('R2_ACCOUNT_ID', '')
    r2_access_key_id = os.getenv('R2_ACCESS_KEY_ID', '')
    r2_secret_access_key = os.getenv('R2_SECRET_ACCESS_KEY', '')
    r2_bucket_name = os.getenv('R2_BUCKET_NAME', 'yomaton')
    r2_public_url = os.getenv('R2_PUBLIC_URL', '')
    r2_enabled = os.getenv('R2_ENABLED', 'true').lower() == 'true'
    
    if r2_enabled and r2_account_id and r2_access_key_id and r2_secret_access_key:
        return R2Config({
            'r2_account_id': r2_account_id,
            'r2_access_key_id': r2_access_key_id,
            'r2_secret_access_key': r2_secret_access_key,
            'r2_bucket_name': r2_bucket_name,
            'r2_public_url': r2_public_url,
            'r2_enabled': 1 if r2_enabled else 0
        })
    
    return None


def validate_product_exists(
    product_number: str, 
    current_user: User, 
    db: Session
) -> Product:
    """
    验证产品是否存在并返回产品对象
    
    Args:
        product_number: 产品货号
        current_user: 当前用户
        db: 数据库会话
    
    Returns:
        产品对象
    
    Raises:
        HTTPException: 当产品不存在时抛出404错误
    """
    from routers.auth import is_admin_user
    
    query = db.query(Product).filter(Product.product_number == product_number)
    
    if not is_admin_user(current_user):
        query = query.filter(Product.company_code == current_user.company_code)
    
    product = query.first()
    
    if product is None:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Product not found"
        )
    
    return product


def get_company_r2_config(company_code: str, db: Session) -> Optional[R2Config]:
    """
    获取公司的 R2 配置
    
    优先从缓存获取，没有则从数据库获取，最后从.env获取并缓存
    
    Args:
        company_code: 公司代码
        db: 数据库会话
    
    Returns:
        R2配置对象，如果不存在则返回None
    """
    cached_config = get_cached_config(company_code)
    if cached_config:
        return cached_config
    
    # 先从当前公司的数据库配置获取
    db_config = db.query(CompanyR2Config).filter(
        CompanyR2Config.company_code == company_code
    ).first()
    
    # 如果没有，尝试从默认公司(0000)获取
    if not db_config:
        db_config = db.query(CompanyR2Config).filter(
            CompanyR2Config.company_code == "0000"
        ).first()
    
    if db_config and db_config.r2_enabled:
        r2_config = R2Config({
            'r2_account_id': db_config.r2_account_id,
            'r2_access_key_id': db_config.r2_access_key_id,
            'r2_secret_access_key': db_config.r2_secret_access_key,
            'r2_bucket_name': db_config.r2_bucket_name,
            'r2_public_url': db_config.r2_public_url,
            'r2_enabled': db_config.r2_enabled
        })
        set_cached_config(company_code, r2_config)
        return r2_config
    
    # 最后从.env获取
    env_config = get_r2_config_from_env()
    if env_config:
        set_cached_config(company_code, env_config)
        return env_config
    
    return None


def delete_r2_and_local_files(
    r2_key: Optional[str],
    thumbnail_r2_key: Optional[str],
    file_path: Optional[str],
    company_code: str,
    db: Session
) -> None:
    """
    删除R2文件（不再删除本地文件）
    
    Args:
        r2_key: R2文件键
        thumbnail_r2_key: R2缩略图文件键
        file_path: 本地文件路径（已不再使用）
        company_code: 公司代码
        db: 数据库会话
    """
    r2_config = get_company_r2_config(company_code, db)
    
    if r2_config:
        r2_uploader = get_r2_uploader()
        if r2_uploader.is_available(r2_config):
            if r2_key:
                r2_uploader.delete_file(r2_key, r2_config)
            if thumbnail_r2_key:
                r2_uploader.delete_file(thumbnail_r2_key, r2_config)