# purchase - 认购群API路由
# Version: 0.0.5 (2026-04-29)
# 认购群、成员、藏品管理

from fastapi import APIRouter, Depends, HTTPException, Query
from sqlalchemy.orm import Session
from pydantic import BaseModel
from typing import Optional, List
from datetime import datetime
from app.core.database import get_db
from app.core.auth import get_current_user
from app.models.models import User
from app.models.purchase import PurchaseGroup, PurchaseMember, PurchaseCollection

router = APIRouter(prefix="/api/purchase", tags=["认购"])

# ============ Schema ============
class PurchaseGroupCreate(BaseModel):
    name: str
    description: str
    total_members: int
    total_collections: int
    cycle_months: int
    start_date: str

class PurchaseGroupResponse(BaseModel):
    cycle_months: Optional[int] = None
    start_date: Optional[datetime] = None
    id: str
    group_code: str
    name: str
    description: Optional[str]
    creator_id: str
    creator_name: Optional[str]
    status: str
    total_members: int
    total_pending: int
    total_collections: int
    total_confirmed: int
    total_amount: float
    avg_price: Optional[float] = None
    created_at: Optional[datetime]

class PurchaseCollectionCreate(BaseModel):
    collection_name: Optional[str] = None
    collection_code: Optional[str] = None
    number: Optional[str] = None
    collection_code: Optional[str] = None
    grading: Optional[str] = None
    boss_name: Optional[str] = None
    price: Optional[float] = None
    source: Optional[str] = None
    paid: Optional[bool] = False

class PurchaseCollectionUpdate(BaseModel):
    collection_name: Optional[str] = None
    number: Optional[str] = None
    grading: Optional[str] = None
    boss_name: Optional[str] = None
    price: Optional[float] = None
    source: Optional[str] = None
    paid: Optional[bool] = None
    status: Optional[str] = None

class PurchaseCollectionResponse(BaseModel):
    id: str
    group_id: str
    user_id: str
    user_name: Optional[str]
    collection_name: Optional[str]
    collection_code: Optional[str]
    number: Optional[str] = None
    collection_code: Optional[str] = None
    grading: Optional[str] = None
    boss_name: Optional[str] = None
    price: Optional[float] = None
    source: Optional[str] = None
    paid: bool
    status: str
    submit_date: Optional[datetime]
    submitted_at: Optional[datetime]

class MemberResponse(BaseModel):
    id: str
    user_id: str
    user_name: Optional[str]
    user_avatar: Optional[str]
    role: str
    status: str
    joined_at: Optional[datetime]

# ============ 工具函数 ============
def generate_group_code(db: Session) -> str:
    """生成群编码：年+序号，如 26001"""
    year = datetime.now().year % 100  # 26
    # 查找当前年份最大的编号
    last = db.query(PurchaseGroup).filter(
        PurchaseGroup.group_code.like(f"{year}%")
    ).order_by(PurchaseGroup.group_code.desc()).first()
    
    if last and last.group_code:
        try:
            num = int(last.group_code) + 1
        except:
            num = 1
    else:
        num = 1
    
    return f"{year}{num:03d}"  # 26001

# ============ 认购群API ============

@router.get("/groups", response_model=List[PurchaseGroupResponse])
def get_groups(
    status: str = Query("active", description="过滤状态"),
    db: Session = Depends(get_db)
):
    """获取所有认购群列表"""
    query = db.query(PurchaseGroup)
    if status:
        query = query.filter(PurchaseGroup.status == status)
    groups = query.order_by(PurchaseGroup.created_at.desc()).all()
    return groups

@router.get("/my-groups", response_model=List[PurchaseGroupResponse])
def get_my_groups(
    current_user = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """获取我参与的认购群"""
    if not current_user:
        return []
    
    member_groups = db.query(PurchaseMember).filter(
        PurchaseMember.user_id == current_user.f99_90_id,
        PurchaseMember.status == "approved"
    ).all()
    
    group_ids = [m.group_id for m in member_groups]
    if not group_ids:
        return []
    
    groups = db.query(PurchaseGroup).filter(
        PurchaseGroup.id.in_(group_ids)
    ).all()
    
    return groups

@router.get("/groups/{group_id}/pending-members", response_model=List[MemberResponse])
def get_pending_members(
    group_id: str,
    current_user = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """获取待审批成员列表"""
    group = db.query(PurchaseGroup).filter(PurchaseGroup.id == group_id).first()
    if not group:
        raise HTTPException(status_code=404, detail="认购群不存在")
    
    if group.creator_id != current_user.f99_90_id:
        raise HTTPException(status_code=403, detail="只有群主可以查看")
    
    members = db.query(PurchaseMember).filter(
        PurchaseMember.group_id == group_id,
        PurchaseMember.status == "pending"
    ).order_by(PurchaseMember.joined_at.asc()).all()
    
    return members

@router.post("/groups/{group_id}/members/{member_id}/approve")
def approve_member(
    group_id: str,
    member_id: str,
    action: str = Query(..., description="approve/reject"),
    current_user = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """审批或拒绝成员"""
    group = db.query(PurchaseGroup).filter(PurchaseGroup.id == group_id).first()
    if not group:
        raise HTTPException(status_code=404, detail="认购群不存在")
    
    if group.creator_id != current_user.f99_90_id:
        raise HTTPException(status_code=403, detail="只有群主可以审批")
    
    member = db.query(PurchaseMember).filter(
        PurchaseMember.id == member_id,
        PurchaseMember.group_id == group_id
    ).first()
    
    if not member:
        raise HTTPException(status_code=404, detail="成员不存在")
    
    if action == "approve":
        member.status = "approved"
        group.total_members += 1
        group.total_pending -= 1
        db.commit()
        return {"message": "已批准加入"}
    elif action == "reject":
        member.status = "rejected"
        group.total_pending -= 1
        db.commit()
        return {"message": "已拒绝加入"}
    else:
        raise HTTPException(status_code=400, detail="无效操作")

@router.post("/groups", response_model=PurchaseGroupResponse)
def create_group(
    data: PurchaseGroupCreate,
    current_user = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """创建认购群"""
    if not current_user:
        raise HTTPException(status_code=401, detail="请先登录")
    
    # 普通用户最多创建3个认购群
    if current_user.role not in ["admin", "superadmin"]:
        existing_count = db.query(PurchaseGroup).filter(
            PurchaseGroup.creator_id == current_user.f99_90_id
        ).count()
        if existing_count >= 3:
            raise HTTPException(status_code=400, detail="普通用户最多创建3个认购群")
    
    group_code = generate_group_code(db)
    
    # 处理日期
    start_date = None
    if data.start_date:
        try:
            start_date = datetime.fromisoformat(data.start_date.replace('Z', '+08:00'))
        except:
            start_date = datetime.now()
    
    group = PurchaseGroup(
        group_code=group_code,
        name=data.name,
        description=data.description,
        creator_id=current_user.f99_90_id,
        creator_name=current_user.f01_01_name,
        status="active",
        total_members=data.total_members,
        total_collections=data.total_collections,
        cycle_months=data.cycle_months,
        start_date=start_date
    )
    db.add(group)
    db.commit()
    
    member = PurchaseMember(
        group_id=group.id,
        user_id=current_user.f99_90_id,
        user_name=current_user.f01_01_name,
        user_avatar=current_user.avatar,
        role="creator",
        status="approved"
    )
    db.add(member)
    group.total_members = 1
    db.commit()
    db.refresh(group)
    
    return group

@router.get("/groups/{group_id}", response_model=PurchaseGroupResponse)
def get_group(group_id: str, db: Session = Depends(get_db)):
    """获取认购群详情"""
    group = db.query(PurchaseGroup).filter(PurchaseGroup.id == group_id).first()
    if not group:
        raise HTTPException(status_code=404, detail="认购群不存在")
    return group

@router.post("/groups/{group_id}/join")
def join_group(
    group_id: str,
    current_user = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """申请加入认购群"""
    if not current_user:
        raise HTTPException(status_code=401, detail="请先登录")
    
    group = db.query(PurchaseGroup).filter(PurchaseGroup.id == group_id).first()
    if not group:
        raise HTTPException(status_code=404, detail="认购群不存在")
    
    if group.status != "active":
        raise HTTPException(status_code=400, detail="该认购群已结束")
    
    existing = db.query(PurchaseMember).filter(
        PurchaseMember.group_id == group_id,
        PurchaseMember.user_id == current_user.f99_90_id
    ).first()
    
    if existing:
        if existing.status == "approved":
            raise HTTPException(status_code=400, detail="您已加入该认购群")
        elif existing.status == "pending":
            raise HTTPException(status_code=400, detail="您已申请加入，等待审批")
        elif existing.status == "rejected":
            existing.status = "pending"
            existing.joined_at = datetime.now()
            group.total_pending += 1
            db.commit()
            return {"message": "已重新申请，等待审批"}
    
    member = PurchaseMember(
        group_id=group_id,
        user_id=current_user.f99_90_id,
        user_name=current_user.f01_01_name,
        user_avatar=current_user.avatar,
        role="member",
        status="pending"
    )
    db.add(member)
    group.total_pending += 1
    db.commit()
    
    return {"message": "申请成功，等待群主审批"}

@router.get("/groups/{group_id}/members", response_model=List[MemberResponse])
def get_group_members(
    group_id: str,
    current_user = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """获取认购群成员列表"""
    members = db.query(PurchaseMember).filter(
        PurchaseMember.group_id == group_id,
        PurchaseMember.status == "approved"
    ).order_by(PurchaseMember.joined_at.asc()).all()
    
    return [
        {
            "id": m.id,
            "user_id": m.user_id,
            "user_name": m.user_name,
            "user_avatar": m.user_avatar,
            "role": m.role,
            "status": m.status,
            "joined_at": m.joined_at
        }
        for m in members
    ]

@router.get("/groups/{group_id}/collections", response_model=List[PurchaseCollectionResponse])
def get_group_collections(group_id: str, db: Session = Depends(get_db)):
    """获取认购群藏品列表"""
    collections = db.query(PurchaseCollection).filter(
        PurchaseCollection.group_id == group_id
    ).order_by(PurchaseCollection.submitted_at.desc()).all()
    
    return [
        {
            "id": c.id,
            "group_id": c.group_id,
            "user_id": c.user_id,
            "user_name": c.user_name,
            "collection_name": c.collection_name,
            "collection_code": c.collection_code,
            "number": c.number,
            "grading": c.grading,
            "boss_name": c.boss_name,
            "price": float(c.price),
            "source": c.source,
            "paid": c.paid,
            "status": c.status,
            "submit_date": c.submit_date,
            "submitted_at": c.submitted_at
        }
        for c in collections
    ]

@router.post("/groups/{group_id}/collections", response_model=PurchaseCollectionResponse)
def add_collection(
    group_id: str,
    data: PurchaseCollectionCreate,
    current_user = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """提交认购藏品"""
    if not current_user:
        raise HTTPException(status_code=401, detail="请先登录")
    
    # All fields now optional - frontend will send what it has
    # No validation needed as all fields are Optional in schema
    
    group = db.query(PurchaseGroup).filter(PurchaseGroup.id == group_id).first()
    if not group:
        raise HTTPException(status_code=404, detail="认购群不存在")
    
    member = db.query(PurchaseMember).filter(
        PurchaseMember.group_id == group_id,
        PurchaseMember.user_id == current_user.f99_90_id,
        PurchaseMember.status == "approved"
    ).first()
    
    if not member:
        raise HTTPException(status_code=400, detail="请先加入该认购群并通过审批")
    
    max_code = db.query(PurchaseCollection).filter(
        PurchaseCollection.group_id == group_id
    ).order_by(PurchaseCollection.collection_code.desc()).first()
    
    if max_code and max_code.collection_code:
        try:
            next_num = int(max_code.collection_code) + 1
        except:
            next_num = 1
    else:
        next_num = 1
    
    collection_code = f"{next_num:03d}"
    
    collection = PurchaseCollection(
        group_id=group_id,
        user_id=current_user.f99_90_id,
        user_name=current_user.f01_01_name,
        collection_name=data.collection_name,
        collection_code=collection_code,
        number=data.number,
        grading=data.grading,
        boss_name=data.boss_name,
        price=data.price,
        source=data.source,
        paid=data.paid,
        status="pending"
    )
    db.add(collection)
    
    group.total_collections += 1
    from decimal import Decimal
    group.total_amount += Decimal(str(data.price))
    if group.total_collections > 0:
        group.avg_price = group.total_amount / group.total_collections
    
    db.commit()
    db.refresh(collection)
    
    return collection

@router.put("/groups/{group_id}/collections/{collection_id}", response_model=PurchaseCollectionResponse)
def update_collection(
    group_id: str,
    collection_id: str,
    data: PurchaseCollectionUpdate,
    current_user = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """编辑认购藏品 (仅群主可操作)"""
    if not current_user:
        raise HTTPException(status_code=401, detail="请先登录")
    
    group = db.query(PurchaseGroup).filter(PurchaseGroup.id == group_id).first()
    if not group:
        raise HTTPException(status_code=404, detail="认购群不存在")
    
    if group.creator_id != current_user.f99_90_id:
        raise HTTPException(status_code=403, detail="只有群主可以编辑")
    
    collection = db.query(PurchaseCollection).filter(
        PurchaseCollection.id == collection_id,
        PurchaseCollection.group_id == group_id
    ).first()
    
    if not collection:
        raise HTTPException(status_code=404, detail="藏品不存在")
    
    old_price = float(collection.price)
    
    # 更新字段
    if data.collection_name is not None:
        collection.collection_name = data.collection_name
    if data.number is not None:
        collection.number = data.number
    if data.grading is not None:
        collection.grading = data.grading
    if data.boss_name is not None:
        collection.boss_name = data.boss_name
    if data.source is not None:
        collection.source = data.source
    if data.paid is not None:
        collection.paid = data.paid
    
    # 处理状态变化
    new_status = data.status
    if new_status and new_status != collection.status:
        if new_status == "confirmed" and collection.status != "confirmed":
            group.total_confirmed += 1
        elif collection.status == "confirmed" and new_status != "confirmed":
            group.total_confirmed -= 1
        collection.status = new_status
    
    # 处理价格变化
    if data.price is not None and data.price != old_price:
        from decimal import Decimal
        group.total_amount = group.total_amount - Decimal(str(old_price)) + Decimal(str(data.price))
        if group.total_collections > 0:
            group.avg_price = group.total_amount / group.total_collections
    
    db.commit()
    db.refresh(collection)
    
    return collection

@router.post("/groups/{group_id}/close")
def close_group(
    group_id: str,
    current_user = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """结束认购群"""
    if not current_user:
        raise HTTPException(status_code=401, detail="请先登录")
    
    group = db.query(PurchaseGroup).filter(PurchaseGroup.id == group_id).first()
    if not group:
        raise HTTPException(status_code=404, detail="认购群不存在")
    
    if group.creator_id != current_user.f99_90_id:
        raise HTTPException(status_code=403, detail="只有群主可以结束认购群")
    
    group.status = "closed"
    db.commit()
    
    return {"message": "认购群已结束"}
@router.delete("/groups/{group_id}")
def delete_group(
    group_id: str,
    current_user = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """删除认购群 (仅管理员可操作)"""
    if not current_user:
        raise HTTPException(status_code=401, detail="请先登录")
    
    # 管理员权限检查
    if current_user.role not in ["admin", "superadmin"]:
        raise HTTPException(status_code=403, detail="只有管理员可以删除认购群")
    
    group = db.query(PurchaseGroup).filter(PurchaseGroup.id == group_id).first()
    if not group:
        raise HTTPException(status_code=404, detail="认购群不存在")
    
    # 删除相关成员和藏品
    db.query(PurchaseMember).filter(PurchaseMember.group_id == group_id).delete()
    db.query(PurchaseCollection).filter(PurchaseCollection.group_id == group_id).delete()
    db.delete(group)
    db.commit()
    
    return {"message": "认购群已删除"}

class MemberUpdate(BaseModel):
    wechat_name: Optional[str] = None
    contact: Optional[str] = None
    purchase_count: Optional[int] = None
    paid_amount: Optional[float] = None
    notes: Optional[str] = None

class GroupUpdate(BaseModel):
    name: Optional[str] = None
    description: Optional[str] = None
    cycle_months: Optional[int] = None
    start_date: Optional[str] = None

# 更新成员信息
@router.put("/groups/{group_id}/members/{member_id}")
def update_member(
    group_id: str,
    member_id: str,
    data: MemberUpdate,
    current_user = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """更新成员信息 (成员自己或群主可编辑)"""
    if not current_user:
        raise HTTPException(status_code=401, detail="请先登录")
    
    group = db.query(PurchaseGroup).filter(PurchaseGroup.id == group_id).first()
    if not group:
        raise HTTPException(status_code=404, detail="认购群不存在")
    
    member = db.query(PurchaseMember).filter(
        PurchaseMember.id == member_id,
        PurchaseMember.group_id == group_id
    ).first()
    
    if not member:
        raise HTTPException(status_code=404, detail="成员不存在")
    
    # 只有成员自己或群主可以修改
    if member.user_id != current_user.f99_90_id and group.creator_id != current_user.f99_90_id:
        raise HTTPException(status_code=403, detail="无权修改")
    
    if data.wechat_name is not None:
        member.wechat_name = data.wechat_name
    if data.contact is not None:
        member.contact = data.contact
    if data.purchase_count is not None:
        member.purchase_count = data.purchase_count
    if data.paid_amount is not None:
        from decimal import Decimal
        member.paid_amount = Decimal(str(data.paid_amount))
    if data.notes is not None:
        member.notes = data.notes
    
    db.commit()
    db.refresh(member)
    
    return {"message": "更新成功", "member_id": member.id}

# 更新群信息
@router.put("/groups/{group_id}", response_model=PurchaseGroupResponse)
def update_group(
    group_id: str,
    data: GroupUpdate,
    current_user = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """更新群信息 (仅群主可编辑)"""
    if not current_user:
        raise HTTPException(status_code=401, detail="请先登录")
    
    group = db.query(PurchaseGroup).filter(PurchaseGroup.id == group_id).first()
    if not group:
        raise HTTPException(status_code=404, detail="认购群不存在")
    
    if group.creator_id != current_user.f99_90_id:
        raise HTTPException(status_code=403, detail="只有群主可以修改")
    
    if data.name is not None:
        group.name = data.name
    if data.description is not None:
        group.description = data.description
    if data.cycle_months is not None:
        group.cycle_months = data.cycle_months
    if data.start_date is not None:
        try:
            group.start_date = datetime.fromisoformat(data.start_date.replace('Z', '+08:00'))
        except:
            pass
    
    db.commit()
    db.refresh(group)
    
    return group