import logging

from fastapi import APIRouter, Depends, HTTPException, Request
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

logger = logging.getLogger("payment")

from app.dependencies import get_db, get_current_user
from app.models.user import User
from app.models.payment_order import PaymentOrder
from app.models.recharge_package import RechargePackage
from app.schemas.payment import RechargeRequest, PaymentOrderOut
from app.services.payment import (
    create_recharge_order,
    verify_wechat_callback,
    verify_alipay_callback,
    process_payment_success_by_order_no,
)

router = APIRouter(prefix="/payments", tags=["payments"])


@router.get("/methods")
async def get_payment_methods(db: AsyncSession = Depends(get_db)):
    """Return which payment methods are enabled (from admin config)."""
    from app.services.payment import _get_payment_configs
    configs = await _get_payment_configs(db)
    return {
        "alipay": configs.get("payment_alipay_enabled", "").lower() == "true",
        "wechat": configs.get("payment_wechat_enabled", "").lower() == "true",
    }


@router.post("/recharge", response_model=PaymentOrderOut)
async def recharge(
    req: RechargeRequest,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    if req.method not in ("wechat", "alipay"):
        raise HTTPException(status_code=400, detail="不支持的支付方式")

    # Check if the selected payment method is enabled in admin config
    from app.services.payment import _get_payment_configs, _is_mock_mode
    configs = await _get_payment_configs(db)
    if not _is_mock_mode(configs):
        enabled_key = f"payment_{req.method}_enabled"
        if configs.get(enabled_key, "").lower() != "true":
            raise HTTPException(status_code=400, detail="该支付方式未启用")

    result = await db.execute(
        select(RechargePackage).where(
            RechargePackage.id == req.plan,
            RechargePackage.is_active == True,
        )
        .limit(1)
    )
    pkg = result.scalar_one_or_none()
    if not pkg:
        raise HTTPException(status_code=400, detail="无效的套餐")
    try:
        order = await create_recharge_order(
            db,
            current_user.id,
            credits=pkg.credits,
            price=pkg.price,
            label=pkg.name,
            bonus_credits=pkg.bonus_credits,
            method=req.method,
        )
    except ValueError as e:
        raise HTTPException(status_code=400, detail=str(e))
    return order


@router.post("/wechat/callback")
async def wechat_callback(request: Request, db: AsyncSession = Depends(get_db)):
    data = await request.json()
    if not await verify_wechat_callback(data, db):
        raise HTTPException(status_code=400, detail="签名验证失败")
    order_no = data.get("out_trade_no")
    if order_no:
        await process_payment_success_by_order_no(db, order_no)
    return {"code": "SUCCESS", "message": "OK"}


@router.post("/alipay/callback")
async def alipay_callback(request: Request, db: AsyncSession = Depends(get_db)):
    form_data = await request.form()
    data = dict(form_data)
    logger.info(
        f"ALIPAY_CALLBACK order_no={data.get('out_trade_no')} "
        f"data={data}"
    )

    # Verify signature first
    if not await verify_alipay_callback(data, db):
        raise HTTPException(status_code=400, detail="签名验证失败")

    # Check trade_status – only "TRADE_SUCCESS" and "TRADE_FINISHED" mean paid
    trade_status = data.get("trade_status", "")
    if trade_status not in ("TRADE_SUCCESS", "TRADE_FINISHED"):
        logger.info(f"Alipay callback trade_status={trade_status}, ignoring")
        return "success"

    order_no = data.get("out_trade_no")
    trade_no = data.get("trade_no", "")
    if order_no:
        await process_payment_success_by_order_no(db, order_no, trade_no)

    return "success"


@router.get("/orders", response_model=list[PaymentOrderOut])
async def list_orders(
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    # Auto-expire stale pending orders before returning
    from app.services.payment import _check_and_expire_order
    result = await db.execute(
        select(PaymentOrder)
        .where(PaymentOrder.user_id == current_user.id)
        .order_by(PaymentOrder.created_at.desc())
    )
    orders = result.scalars().all()
    for o in orders:
        await _check_and_expire_order(db, o)
    return orders


@router.post("/orders/{order_no}/cancel")
async def cancel_order(
    order_no: str,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    """Cancel a pending order. Only the order owner can cancel, only if still pending."""
    result = await db.execute(
        select(PaymentOrder).where(
            PaymentOrder.order_no == order_no,
            PaymentOrder.user_id == current_user.id,
        ).limit(1)
    )
    order = result.scalar_one_or_none()
    if not order:
        raise HTTPException(status_code=404, detail="订单不存在")
    if order.status != "pending":
        raise HTTPException(status_code=400, detail=f"订单状态为{order.status}，无法取消")
    order.status = "cancelled"
    await db.flush()
    logger.info(
        f"ORDER_CANCELLED order_no={order_no} user={current_user.id} amount={order.amount}"
    )
    return {"ok": True}