# purchase - 认购群模型
# Version: 0.0.1 (2026-04-24)
# 认购群、成员、藏品管理

from sqlalchemy import Column, String, Text, Integer, DECIMAL, DateTime, ForeignKey
from sqlalchemy.sql import func
from app.core.database import Base
import uuid

def generate_uuid():
    return str(uuid.uuid4())

class PurchaseGroup(Base):
    """认购群表"""
    __tablename__ = "purchase_group"
    
    id = Column(String(36), primary_key=True, default=generate_uuid)
    name = Column(String(100), nullable=False)  # 认购群名称
    description = Column(Text, nullable=True)  # 描述
    creator_id = Column(String(36), nullable=False)  # 创建者ID
    creator_name = Column(String(50), nullable=True)  # 创建者名字
    status = Column(String(20), default="active")  # active/closed
    total_members = Column(Integer, default=0)  # 总参与人数
    total_collections = Column(Integer, default=0)  # 总藏品数
    total_amount = Column(DECIMAL(12,2), default=0)  # 总金额
    avg_price = Column(DECIMAL(10,2), default=0)  # 均价
    created_at = Column(DateTime(timezone=True), server_default=func.now())
    updated_at = Column(DateTime(timezone=True), onupdate=func.now())

class PurchaseMember(Base):
    """认购成员表"""
    __tablename__ = "purchase_member"
    
    id = Column(String(36), primary_key=True, default=generate_uuid)
    group_id = Column(String(36), ForeignKey("purchase_group.id"), nullable=False)
    user_id = Column(String(36), nullable=False)
    user_name = Column(String(50), nullable=True)
    user_avatar = Column(String(255), nullable=True)
    role = Column(String(20), default="member")  # creator/admin/member
    joined_at = Column(DateTime(timezone=True), server_default=func.now())

class PurchaseCollection(Base):
    """认购藏品表"""
    __tablename__ = "purchase_collection"
    
    id = Column(String(36), primary_key=True, default=generate_uuid)
    group_id = Column(String(36), ForeignKey("purchase_group.id"), nullable=False)
    user_id = Column(String(36), nullable=False)
    user_name = Column(String(50), nullable=True)
    collection_name = Column(String(100), nullable=True)  # 藏品名称
    collection_code = Column(String(50), nullable=True)  # 藏品编号
    number = Column(String(50), nullable=True)  # 冠字号
    price = Column(DECIMAL(10,2), nullable=False)  # 认购价格
    status = Column(String(20), default="pending")  # pending/confirmed
    submitted_at = Column(DateTime(timezone=True), server_default=func.now())