from sqlalchemy import Column, String, Integer, DateTime, ForeignKey, Enum
from sqlalchemy.dialects.mysql import DECIMAL
from sqlalchemy.sql import func
from pydantic import BaseModel, Field
from typing import Optional
from datetime import datetime
from .database import Base
import random
import time
import enum

class MerchantOrderStatus(str, enum.Enum):
    CREATED = "CREATED"       # 已下单
    UNVERIFIED = "UNVERIFIED" # 未核销
    VERIFIED = "VERIFIED"     # 已核销
    REFUNDING = "REFUNDING"   # 退款中
    REFUNDED = "REFUNDED"     # 已退款

class MerchantOrderDB(Base):
    __tablename__ = "merchant_orders"

    id = Column(Integer, primary_key=True, autoincrement=True)
    order_id = Column(String(15), unique=True, nullable=False)
    user_id = Column(Integer, ForeignKey("users.userid"), nullable=False)
    merchant_product_id = Column(Integer, ForeignKey("merchant_products.id"), nullable=False)
    order_amount = Column(DECIMAL(10,2), nullable=False)
    status = Column(Enum(MerchantOrderStatus), nullable=False, default=MerchantOrderStatus.CREATED)
    order_verify_code = Column(String(21), unique=True, nullable=False)
    verify_time = Column(DateTime(timezone=True), nullable=True)
    verify_user_id = Column(Integer, ForeignKey("users.userid"), nullable=True)
    create_time = Column(DateTime(timezone=True), server_default=func.now())
    update_time = Column(DateTime(timezone=True), onupdate=func.now())

class MerchantOrderCreate(BaseModel):
    merchant_product_id: int
    order_amount: float = Field(..., gt=0)

class MerchantOrderInfo(BaseModel):
    id: int
    order_id: str
    user_id: int
    merchant_product_id: int
    order_amount: float
    status: MerchantOrderStatus
    order_verify_code: str
    verify_time: Optional[datetime]
    verify_user_id: Optional[int]
    create_time: datetime
    update_time: Optional[datetime]
    product_name: Optional[str] = None
    product_image: Optional[str] = None
    product_price: Optional[float] = None
    merchant_name: Optional[str] = None
    merchant_logo: Optional[str] = None
    merchant_address: Optional[str] = None
    
    class Config:
        from_attributes = True

def generate_order_id() -> str:
    """生成订单号：8位日期 + 7位时间戳"""
    now = datetime.now()
    date_str = now.strftime('%Y%m%d')
    # 取时间戳后7位
    timestamp = str(int(time.time() * 1000))[-7:]
    return f"{date_str}{timestamp}"

def generate_verify_code() -> str:
    """生成21位数字核销码"""
    return ''.join(random.choices('0123456789', k=21))