from fastapi import APIRouter, Depends, Query, HTTPException
from sqlalchemy.orm import Session
from pydantic import BaseModel
from typing import Optional
from datetime import datetime, date
from app.core.database import get_db
from app.core.auth import get_current_user
from app.models.deal_info import DealInfo

router = APIRouter(prefix="/api/deal", tags=["成交行情"])

# ============ Schema ============
class DealInfoCreate(BaseModel):
    title: str
    content: Optional[str] = None
    deal_price: Optional[float] = None
    deal_date: Optional[str] = None  # YYYY-MM-DD
    packaging: Optional[str] = None
    category: Optional[str] = None
    is_graded: Optional[bool] = False
    grading_company: Optional[str] = None
    grading_score: Optional[str] = None
    tail_number: Optional[str] = None
    size_type: Optional[str] = None
    version: Optional[str] = None
    platform: Optional[str] = None
    seller: Optional[str] = None
    buyer: Optional[str] = None

class DealInfoUpdate(BaseModel):
    title: Optional[str] = None
    content: Optional[str] = None
    deal_price: Optional[float] = None
    deal_date: Optional[str] = None
    packaging: Optional[str] = None
    category: Optional[str] = None
    is_graded: Optional[bool] = None
    grading_company: Optional[str] = None
    grading_score: Optional[str] = None
    tail_number: Optional[str] = None
    size_type: Optional[str] = None
    version: Optional[str] = None
    platform: Optional[str] = None
    seller: Optional[str] = None
    buyer: Optional[str] = None
    status: Optional[str] = None

class DealInfoResponse(BaseModel):
    id: str
    user_id: Optional[str]
    title: str
    content: Optional[str]
    deal_price: Optional[float]
    deal_date: Optional[date]
    deal_no: Optional[str]
    packaging: Optional[str]
    category: Optional[str]
    is_graded: Optional[bool]
    grading_company: Optional[str]
    grading_score: Optional[str]
    tail_number: Optional[str]
    size_type: Optional[str]
    version: Optional[str]
    platform: Optional[str]
    seller: Optional[str]
    buyer: Optional[str]
    status: str
    view_count: int
    contact_count: int
    created_at: Optional[datetime]
    updated_at: Optional[datetime]

    class Config:
        from_attributes = True

# 生成行情编号
def generate_deal_no(db: Session):
    """生成行情编号，从A000001开始递增"""
    last = db.query(DealInfo).order_by(DealInfo.deal_no.desc()).first()
    if last and last.deal_no:
        # 例如 A000001 -> 2 -> A000002
        num = int(last.deal_no[1:]) + 1
        return f"A{num:06d}"
    return "A000001"

# ============ API ============
@router.get("/list", response_model=list[DealInfoResponse])
def get_deal_list(
    status: str = Query("active"),
    deal_date: Optional[str] = Query(None),
    page: int = Query(1, ge=1),
    page_size: int = Query(20, ge=1, le=1000),
    user_only: bool = Query(False),  # 是否只查看自己的
    current_user: Optional = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """获取成交行情列表"""
    query = db.query(DealInfo).filter(DealInfo.status == status)
    
    # 我的行情：只查看自己的（管理员也只看自己的）
    if user_only and current_user:
        query = query.filter(DealInfo.user_id == current_user.f99_90_id)
    
    # 成交日期过滤
    if deal_date:
        query = query.filter(DealInfo.deal_date == deal_date)
    
    # 排序：优先成交日期倒序，同日按编号倒序
    query = query.order_by(DealInfo.deal_date.desc().nullslast(), DealInfo.deal_no.desc().nullslast())
    
    # 分页
    offset = (page - 1) * page_size
    items = query.offset(offset).limit(page_size).all()
    
    return items

@router.get("/stats")
def get_deal_stats(
    db: Session = Depends(get_db)
):
    """获取成交行情统计"""
    total = db.query(DealInfo).filter(DealInfo.status == "active").count()
    
    # 按日期统计
    from sqlalchemy import func
    date_stats = db.query(
        DealInfo.deal_date,
        func.count(DealInfo.id).label('count')
    ).filter(
        DealInfo.status == "active",
        DealInfo.deal_date.isnot(None)
    ).group_by(DealInfo.deal_date).order_by(DealInfo.deal_date.desc()).limit(10).all()
    
    return {
        "total": total,
        "by_date": [{"date": str(d.deal_date), "count": d.count} for d in date_stats]
    }

@router.post("", response_model=DealInfoResponse)
def create_deal(
    data: DealInfoCreate,
    current_user = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """创建成交行情"""
    if not current_user:
        raise HTTPException(status_code=401, detail="请先登录")
    
    # 生成行情编号
    deal_no = generate_deal_no(db)
    
    # 解析日期
    deal_date = None
    if data.deal_date:
        try:
            deal_date = datetime.strptime(data.deal_date, "%Y-%m-%d").date()
        except:
            pass
    
    deal = DealInfo(
        user_id=current_user.f99_90_id if current_user else None,
        title=data.title,
        content=data.content,
        deal_price=data.deal_price,
        deal_date=deal_date,
        deal_no=deal_no,
        packaging=data.packaging,
        category=data.category,
        is_graded=data.is_graded or False,
        grading_company=data.grading_company,
        grading_score=data.grading_score,
        tail_number=data.tail_number,
        size_type=data.size_type,
        version=data.version,
        platform=data.platform,
        seller=data.seller,
        buyer=data.buyer,
        status="active"
    )
    db.add(deal)
    db.commit()
    db.refresh(deal)
    return deal

@router.get("/category-stats")
def get_deal_category_stats(
    version: str = Query("龙钞", description="版本筛选：龙钞、马钞、蛇钞、其他"),
    db: Session = Depends(get_db)
):
    """获取成交行情分类汇总统计数据 - 后端计算优化版"""
    from collections import defaultdict
    
    # 定义版本前缀映射
    version_prefix_map = {"龙钞": "J0", "马钞": "J1", "蛇钞": "J3"}
    packagings = ["标百", "标十", "单张"]
    category_map = {"通货": "带4号", "无4": "带7号", "永恒": "永恒号", "钻石": "钻石号"}
    
    # 构建查询
    query = db.query(DealInfo).filter(
        DealInfo.status == "active", DealInfo.deal_price.isnot(None), DealInfo.deal_price > 0
    )
    if version != "其他" and version in version_prefix_map:
        query = query.filter(DealInfo.title.startswith(version_prefix_map[version]))
    
    deals = query.all()
    stats = defaultdict(lambda: defaultdict(lambda: {"count": 0, "total": 0}))
    
    for deal in deals:
        content = deal.content or ""
        packaging = deal.packaging
        if not packaging and "包装:" in content:
            packaging = content.split("包装:")[1].split("\n")[0].strip()
        category = deal.category
        if not category and "分类:" in content:
            category = content.split("分类:")[1].split("\n")[0].strip()
        if category in category_map:
            category = category_map[category]
        packaging = packaging or "单张"
        category = category or "带4号"
        stats[packaging][category]["count"] += 1
        stats[packaging][category]["total"] += deal.deal_price
    
    result = []
    category_order = ['带4号', '带7号', '永恒号', '天马号', '天马王', '金山号', '金山王', '钻石号', '朦胧号', '朦胧王', '金马号', '金马王', '倒置号', '圆圆号']
    for cat in category_order:
        row = {"category": cat}
        has_data = False
        for pkg in packagings:
            data = stats[pkg][cat]
            if data["count"] > 0:
                row[pkg] = {"avg": round(data["total"] / data["count"]), "count": data["count"]}
                has_data = True
            else:
                row[pkg] = None
        if has_data:
            result.append(row)
    return {"version": version, "data": result}

@router.get("/{deal_id}", response_model=DealInfoResponse)
def get_deal(
    deal_id: str,
    current_user = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """获取成交行情详情"""
    deal = db.query(DealInfo).filter(DealInfo.id == deal_id).first()
    if not deal:
        raise HTTPException(status_code=404, detail="成交行情不存在")
    
    # 增加浏览数
    deal.view_count += 1
    db.commit()
    
    return deal

@router.put("/{deal_id}", response_model=DealInfoResponse)
def update_deal(
    deal_id: str,
    data: DealInfoUpdate,
    current_user = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """更新成交行情"""
    if not current_user:
        raise HTTPException(status_code=401, detail="请先登录")
    
    deal = db.query(DealInfo).filter(DealInfo.id == deal_id).first()
    if not deal:
        raise HTTPException(status_code=404, detail="成交行情不存在")
    
    # 处理日期
    if data.deal_date:
        try:
            data.deal_date = datetime.strptime(data.deal_date, "%Y-%m-%d").date()
        except:
            data.deal_date = None
    
    for key, value in data.model_dump(exclude_unset=True).items():
        setattr(deal, key, value)
    
    db.commit()
    db.refresh(deal)
    return deal

@router.delete("/{deal_id}")
def delete_deal(
    deal_id: str,
    current_user = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    """删除成交行情"""
    if not current_user:
        raise HTTPException(status_code=401, detail="请先登录")
    
    deal = db.query(DealInfo).filter(DealInfo.id == deal_id).first()
    if not deal:
        raise HTTPException(status_code=404, detail="成交行情不存在")
    
    deal.status = "deleted"
    db.commit()
    
    return {"message": "删除成功"}