from fastapi import APIRouter, Depends, HTTPException, Query
from sqlalchemy.orm import Session
from sqlalchemy import and_, desc, asc
from pydantic import BaseModel, Field
from typing import Optional
import uuid
from datetime import datetime, date

from ..database import get_db
from ..models import (
    User, MembershipPlan, Order, Coupon, ValueAddedService,
    CustomServiceOrder, CustomServiceRequest, MembershipSubscription,
    gen_uuid
)
from ..auth import get_current_user
from ..middleware.log_service import LogService

router = APIRouter()


class CreateOrderRequest(BaseModel):
    item_id: str
    coupon_id: Optional[str] = None
    order_type: str = "membership"
    amount: Optional[float] = None


class UseCouponRequest(BaseModel):
    code: str
    order_id: Optional[str] = None


class CustomServiceOrderRequest(BaseModel):
    service_id: str
    description: Optional[str] = None
    budget: Optional[float] = None
    contact_info: Optional[str] = None


class ServiceRequestModel(BaseModel):
    """增值服务工单请求模型（数据定制/私有化/平台代理）"""
    service_id: str
    title: str
    description: Optional[str] = None
    requirements: Optional[dict] = None  # 需求详情


@router.get("/plans")
def list_plans(db: Session = Depends(get_db)):
    plans = db.query(MembershipPlan).filter(MembershipPlan.is_active == True).order_by(asc(MembershipPlan.level)).all()

    result = []
    for p in plans:
        result.append({
            "id": p.id,
            "name": p.name,
            "level": p.level,
            "duration_type": p.duration_type,
            "price": float(p.price) if p.price else 0,
            "daily_free_tokens": p.daily_free_tokens or 0,
            "features": p.features or [],
            "is_active": p.is_active,
        })

    return {"code": 0, "data": result, "message": "ok"}


@router.post("/orders")
def create_order(
    req: CreateOrderRequest,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    plan = db.query(MembershipPlan).filter(
        and_(MembershipPlan.id == req.item_id, MembershipPlan.is_active == True)
    ).first()
    if not plan:
        raise HTTPException(status_code=404, detail="会员计划不存在或已下线")

    amount = req.amount or float(plan.price or 0)

    order = Order(
        id=gen_uuid(),
        user_id=current_user.id,
        order_type=req.order_type if hasattr(req, 'order_type') and req.order_type else "membership",
        item_id=req.item_id,
        item_name=plan.name,
        amount=amount,
        status="pending",
        coupon_id=req.coupon_id if hasattr(req, 'coupon_id') and req.coupon_id else None,
        created_at=datetime.now(),
        updated_at=datetime.now(),
    )
    db.add(order)
    db.commit()
    db.refresh(order)

    LogService.log_operation(
        user_id=current_user.id, username=current_user.username, action="create_order",
        target="payment_order", target_id=order.id,
        detail=f"创建订单 #{order.id}，金额 {amount}",
    )

    return {
        "code": 0,
        "data": {
            "id": order.id,
            "item_id": order.item_id,
            "plan_name": plan.name,
            "amount": float(order.amount),
            "status": order.status,
            "created_at": str(order.created_at),
        },
        "message": "订单创建成功",
    }


@router.get("/orders")
def list_orders(
    status: Optional[str] = Query(None),
    page: int = Query(default=1, ge=1),
    page_size: int = Query(default=20, ge=1, le=100),
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    query = db.query(Order).filter(Order.user_id == current_user.id)
    if status:
        query = query.filter(Order.status == status)

    total = query.count()
    orders = query.order_by(desc(Order.created_at)).offset((page - 1) * page_size).limit(page_size).all()

    result = []
    for o in orders:
        plan = db.query(MembershipPlan).filter(MembershipPlan.id == o.item_id).first()
        result.append({
            "id": o.id,
            "item_id": o.item_id,
            "plan_name": plan.name if plan else "unknown",
            "amount": float(o.amount),
            "status": o.status,
            "coupon_id": o.coupon_id,
            
            "paid_at": str(o.paid_at) if o.paid_at else None,
            "created_at": str(o.created_at),
        })

    return {
        "code": 0,
        "data": {"total": total, "page": page, "page_size": page_size, "items": result},
        "message": "ok",
    }


@router.get("/orders/{order_id}")
def get_order(
    order_id: str,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    order = db.query(Order).filter(
        and_(Order.id == order_id, Order.user_id == current_user.id)
    ).first()
    if not order:
        raise HTTPException(status_code=404, detail="订单不存在")

    plan = db.query(MembershipPlan).filter(MembershipPlan.id == order.item_id).first()

    return {
        "code": 0,
        "data": {
            "id": order.id,
            "item_id": order.item_id,
            "plan_name": plan.name if plan else "unknown",
            "amount": float(order.amount),
            "status": order.status,
            "coupon_id": order.coupon_id,
            
            "paid_at": str(order.paid_at) if order.paid_at else None,
            "created_at": str(order.created_at),
            "updated_at": str(order.updated_at),
        },
        "message": "ok",
    }


@router.post("/orders/{order_id}/pay")
def pay_order(
    order_id: str,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    order = db.query(Order).filter(
        and_(Order.id == order_id, Order.user_id == current_user.id)
    ).first()
    if not order:
        raise HTTPException(status_code=404, detail="订单不存在")

    if order.status != "pending":
        raise HTTPException(status_code=400, detail="订单状态不允许支付")

    # 模拟支付成功
    order.status = "paid"
    order.paid_at = datetime.now()
    order.updated_at = datetime.now()

    # 激活会员
    plan = db.query(MembershipPlan).filter(MembershipPlan.id == order.item_id).first()
    if plan:
        # 查找或创建会员记录
        membership = db.query(MembershipSubscription).filter(
            MembershipSubscription.user_id == current_user.id
        ).first()

        if membership:
            # 如果已有会员，延长有效期
            if membership.end_at and membership.end_at > datetime.now():
                # 从当前到期日开始延长
                membership.end_at = membership.end_at + __import__("datetime").timedelta(days=30)
            else:
                # 已过期，从现在开始
                membership.end_at = datetime.now() + __import__("datetime").timedelta(days=30)
            membership.plan_id = plan.id
            membership.status = "active"
            membership.updated_at = datetime.now()
        else:
            membership = MembershipSubscription(
                id=gen_uuid(),
                user_id=current_user.id,
                plan_id=plan.id,
                status="active",
                start_at=datetime.now(),
                end_at=datetime.now() + __import__("datetime").timedelta(days=30),
                created_at=datetime.now(),
                updated_at=datetime.now(),
            )
            db.add(membership)

    LogService.log_operation(
        user_id=current_user.id, username=current_user.username, action="pay_order",
        target="payment_order", target_id=order.id,
        detail=f"支付订单 #{order.id}，金额 {order.amount}",
    )

    db.commit()

    return {
        "code": 0,
        "data": {
            "order_id": order.id,
            "status": order.status,
            "paid_at": str(order.paid_at),
        },
        "message": "支付成功",
    }


@router.get("/coupons")
def list_coupons(
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    from ..models import UserCoupon
    now = datetime.now()
    # 先获取用户的user_coupons
    user_coupons = db.query(UserCoupon).filter(
        and_(
            UserCoupon.user_id == current_user.id,
            UserCoupon.status == "unused",
        )
    ).all()

    result = []
    coupon_ids = [uc.coupon_id for uc in user_coupons]
    if coupon_ids:
        coupons = db.query(Coupon).filter(
            and_(
                Coupon.id.in_(coupon_ids),
                Coupon.status == "active",
                Coupon.valid_to > now,
            )
        ).order_by(asc(Coupon.valid_to)).all()

        for c in coupons:
            result.append({
                "id": c.id,
                "code": c.code,
                "type": c.type,
                "value": float(c.value) if c.value else 0,
                "min_amount": float(c.min_amount) if c.min_amount else 0,
                "expire_at": str(c.valid_to) if c.valid_to else None,
                "status": c.status,
            })

    return {"code": 0, "data": result, "message": "ok"}


@router.post("/coupons/use")
def use_coupon(
    req: UseCouponRequest,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    from ..models import UserCoupon
    coupon = db.query(Coupon).filter(
        and_(
            Coupon.code == req.code,
            Coupon.status == "active",
        )
    ).first()
    if not coupon:
        raise HTTPException(status_code=404, detail="优惠券不存在或已失效")

    # 检查用户是否持有该优惠券
    user_coupon = db.query(UserCoupon).filter(
        and_(
            UserCoupon.coupon_id == coupon.id,
            UserCoupon.user_id == current_user.id,
            UserCoupon.status == "unused",
        )
    ).first()
    if not user_coupon:
        raise HTTPException(status_code=404, detail="优惠券不存在或已使用")

    if coupon.valid_to and coupon.valid_to < datetime.now():
        user_coupon.status = "expired"
        db.commit()
        raise HTTPException(status_code=400, detail="优惠券已过期")

    # 标记为已使用
    user_coupon.status = "used"
    user_coupon.used_at = datetime.now()

    if req.order_id:
        order = db.query(Order).filter(
            and_(Order.id == req.order_id, Order.user_id == current_user.id)
        ).first()
        if order and order.status == "pending":
            # 应用优惠券折扣
            discount = 0
            if coupon.type == "fixed":
                discount = float(coupon.value or 0)
            elif coupon.type == "percent":
                discount = float(order.amount) * float(coupon.value or 0) / 100

            order.amount = max(0, float(order.amount) - discount)
            order.coupon_id = coupon.id
            order.discount_amount = discount

    db.commit()

    return {"code": 0, "data": {"code": coupon.code, "status": user_coupon.status}, "message": "优惠券使用成功"}


@router.get("/services")
def list_services(db: Session = Depends(get_db)):
    services = db.query(ValueAddedService).filter(
        ValueAddedService.status == "active"
    ).order_by(asc(ValueAddedService.created_at)).all()

    result = []
    for s in services:
        result.append({
            "id": s.id,
            "name": s.name,
            "description": s.description,
            "type": s.type,
            "price": float(s.price) if s.price else 0,
            "features": s.features or [],
            "assigned_agent_id": s.assigned_agent_id,
        })

    return {"code": 0, "data": result, "message": "ok"}


@router.post("/custom-services")
def create_custom_service_order(
    req: CustomServiceOrderRequest,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    service = db.query(ValueAddedService).filter(
        and_(ValueAddedService.id == req.service_id, ValueAddedService.status == "active")
    ).first()
    if not service:
        raise HTTPException(status_code=404, detail="服务不存在或已下线")

    order = CustomServiceOrder(
        id=gen_uuid(),
        user_id=current_user.id,
        service_id=req.service_id,
        service_type=service.type,
        description=req.description,
        price=req.budget or float(service.price or 0),
        status="pending",
        created_at=datetime.now(),
        updated_at=datetime.now(),
    )
    db.add(order)
    db.commit()
    db.refresh(order)

    LogService.log_operation(
        user_id=current_user.id, username=current_user.username, action="create_custom_service",
        target="custom_service_order", target_id=order.id,
        detail=f"创建定制服务订单 #{order.id}，服务: {service.name}",
    )

    return {
        "code": 0,
        "data": {
            "id": order.id,
            "service_id": order.service_id,
            "service_name": service.name,
            "price": float(order.price) if order.price else 0,
            "status": order.status,
            "created_at": str(order.created_at),
        },
        "message": "定制服务订单已提交",
    }


@router.post("/service-requests")
def create_service_request(
    req: ServiceRequestModel,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """创建增值服务工单（平台代理/数据定制/私有化项目）"""
    service = db.query(ValueAddedService).filter(
        and_(ValueAddedService.id == req.service_id, ValueAddedService.status == "active")
    ).first()
    if not service:
        raise HTTPException(status_code=404, detail="服务不存在或已下线")

    # 验证服务类型是否为工单性质
    if service.type not in ("platform_proxy", "data_custom", "private_project"):
        raise HTTPException(status_code=400, detail="此服务不支持工单提交")

    request_obj = CustomServiceRequest(
        id=gen_uuid(),
        user_id=current_user.id,
        service_id=req.service_id,
        request_type=service.type,
        title=req.title,
        description=req.description,
        requirements=req.requirements,
        status="pending",
        created_at=datetime.now(),
        updated_at=datetime.now(),
    )
    db.add(request_obj)
    db.commit()
    db.refresh(request_obj)

    LogService.log_operation(
        user_id=current_user.id, username=current_user.username,
        action="create_service_request",
        target="custom_service_request", target_id=request_obj.id,
        detail=f"创建服务工单 #{request_obj.id}，类型: {service.type}, 标题: {req.title}",
    )

    return {
        "code": 0,
        "data": {
            "id": request_obj.id,
            "service_id": request_obj.service_id,
            "service_name": service.name,
            "request_type": service.type,
            "title": request_obj.title,
            "status": request_obj.status,
            "created_at": str(request_obj.created_at),
        },
        "message": "服务工单已提交",
    }


# ============================================================
# 电子凭证开具 API
# ============================================================

class ReceiptRequest(BaseModel):
    receipt_type: str = Field(default="electronic")  # electronic / invoice
    title: Optional[str] = None  # 发票抬头（公司名称或个人姓名）
    tax_number: Optional[str] = None  # 税号


@router.post("/orders/{order_id}/receipt")
def generate_receipt(
    order_id: str,
    req: ReceiptRequest = Depends(),
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """为已支付订单开具电子凭证"""
    order = db.query(Order).filter(
        and_(Order.id == order_id, Order.user_id == current_user.id)
    ).first()
    if not order:
        raise HTTPException(status_code=404, detail="订单不存在")

    if order.status != "paid":
        raise HTTPException(status_code=400, detail="仅已支付订单可开具电子凭证")

    # 检查是否已开过凭证
    if order.receipt_number:
        return {
            "code": 0,
            "data": {
                "receipt_number": order.receipt_number,
                "receipt_type": order.receipt_type or "electronic",
                "title": order.receipt_title or current_user.username,
                "amount": float(order.amount),
                "issued_at": order.receipt_issued_at.strftime("%Y-%m-%d %H:%M:%S") if order.receipt_issued_at else "",
                "status": "issued",
                "message": "该订单已开具电子凭证",
            },
            "message": "电子凭证已存在",
        }

    # 生成凭证编号：RCT + 年月日 + 随机6位
    now = datetime.now()
    receipt_number = f"RCT{now.strftime('%Y%m%d')}{uuid.uuid4().hex[:6].upper()}"

    # 保存凭证信息到订单
    order.receipt_number = receipt_number
    order.receipt_type = req.receipt_type
    order.receipt_title = req.title or current_user.username
    order.receipt_tax_number = req.tax_number
    order.receipt_issued_at = now
    order.updated_at = now

    # 记录日志
    LogService.log_operation(
        user_id=current_user.id, username=current_user.username, action="generate_receipt",
        target="payment_order", target_id=order.id,
        detail=f"为订单 #{order.id} 开具电子凭证 {receipt_number}",
    )

    db.commit()

    # 构建凭证详情
    receipt_data = {
        "receipt_number": receipt_number,
        "receipt_type": req.receipt_type,
        "title": req.title or current_user.username,
        "tax_number": req.tax_number,
        "order_id": order.id,
        "amount": float(order.amount),
        "order_type": order.order_type or "membership",
        "item_name": order.item_name or "会员订阅",
        "payment_method": order.payment_method or "微信支付",
        "payment_id": order.payment_id or f"PAY{now.strftime('%Y%m%d%H%M%S')}",
        "paid_at": order.paid_at.strftime("%Y-%m-%d %H:%M:%S") if hasattr(order, 'paid_at') and order.paid_at else now.strftime("%Y-%m-%d %H:%M:%S"),
        "issued_at": now.strftime("%Y-%m-%d %H:%M:%S"),
        "customer_name": current_user.username,
        "customer_email": current_user.email or "",
        "customer_phone": current_user.phone or "",
        "status": "issued",
        "platform_name": "AIFlow智能自动化PaaS平台",
        "remarks": "此电子凭证由AIFlow平台自动生成，与纸质凭证具有同等效力。如需帮助，请联系客服。",
    }

    return {
        "code": 0,
        "data": receipt_data,
        "message": "电子凭证开具成功",
    }


@router.get("/orders/{order_id}/receipt")
def get_receipt(
    order_id: str,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """获取订单已有的电子凭证"""
    order = db.query(Order).filter(
        and_(Order.id == order_id, Order.user_id == current_user.id)
    ).first()
    if not order:
        raise HTTPException(status_code=404, detail="订单不存在")

    if not order.receipt_number:
        return {
            "code": 0,
            "data": None,
            "message": "该订单尚未开具电子凭证",
        }

    return {
        "code": 0,
        "data": {
            "receipt_number": order.receipt_number,
            "receipt_type": order.receipt_type or "electronic",
            "title": order.receipt_title or current_user.username,
            "tax_number": order.receipt_tax_number,
            "order_id": order.id,
            "amount": float(order.amount),
            "order_type": order.order_type or "membership",
            "item_name": order.item_name or "会员订阅",
            "payment_method": order.payment_method or "微信支付",
            "issued_at": order.receipt_issued_at.strftime("%Y-%m-%d %H:%M:%S") if order.receipt_issued_at else "",
            "status": "issued" if order.receipt_number else "not_issued",
            "platform_name": "AIFlow智能自动化PaaS平台",
        },
        "message": "ok",
    }