"""
积分系统 API 路由
=================

提供积分查询、充值、消费、流水查询等功能。
"""

import logging
from datetime import UTC, datetime

import httpx
from fastapi import APIRouter, Depends, HTTPException, Request
from fastapi.responses import JSONResponse
from sqlalchemy.ext.asyncio import AsyncSession

from app.api.deps import get_current_user, get_db
from app.crud.point_recharge_order import point_recharge_order
from app.crud.point_transaction import point_transaction
from app.models.user import User
from app.schemas.common import ApiResponse, PaginationParams, success_response
from app.schemas.point import (
    ConsumeRequest,
    PointBalanceResponse,
    PointTransactionItem,
    PointTransactionListResponse,
    RechargeOrderItem,
    RechargeOrderListResponse,
    RechargeRequest,
    RechargeResponse,
)
from app.services import point_service
from app.services.wxpay_service import WechatPayError, get_wxpay_service

logger = logging.getLogger(__name__)
router = APIRouter(prefix="/points", tags=["Points"])


# ── 余额查询 ──────────────────────────────────────────

@router.get("/balance", response_model=ApiResponse[PointBalanceResponse])
async def get_balance(
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """获取当前用户积分余额"""
    balance = await point_service.get_user_balance(db, user_id=current_user.id)
    return success_response(data=PointBalanceResponse(**balance))


# ── 流水查询 ──────────────────────────────────────────

@router.get("/transactions", response_model=ApiResponse[PointTransactionListResponse])
async def list_transactions(
    pagination: PaginationParams = Depends(),
    tx_type: str | None = None,
    category: str | None = None,
    source_type: str | None = None,
    start_time: str | None = None,
    end_time: str | None = None,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """
    获取当前用户积分流水记录（支持筛选）

    - tx_type: consume / recharge / expire
    - category: 脚本生成 / 配音合成 / 视频生成 / 压制成片 / 字幕烧录 / 封面设计 / 充值
    - source_type: script / polish / title / tts / voice_clone / video / compose / subtitle_burn / cover_design / wxpay
    - start_time / end_time: ISO 8601 格式，时间范围最多 30 天
    """
    from datetime import UTC, datetime, timedelta

    # 解析时间范围
    parsed_start: datetime | None = None
    parsed_end: datetime | None = None

    if start_time:
        try:
            parsed_start = datetime.fromisoformat(start_time.replace("Z", "+00:00"))
        except ValueError:
            raise HTTPException(status_code=400, detail="start_time 格式错误，应为 ISO 8601")

    if end_time:
        try:
            parsed_end = datetime.fromisoformat(end_time.replace("Z", "+00:00"))
        except ValueError:
            raise HTTPException(status_code=400, detail="end_time 格式错误，应为 ISO 8601")

    # 限制时间范围最多 30 天
    if parsed_start and parsed_end:
        if (parsed_end - parsed_start) > timedelta(days=30):
            raise HTTPException(status_code=400, detail="时间范围最多 30 天")
    elif parsed_start and not parsed_end:
        parsed_end = parsed_start + timedelta(days=30)
    elif parsed_end and not parsed_start:
        parsed_start = parsed_end - timedelta(days=30)

    items = await point_transaction.get_by_user_id(
        db,
        user_id=current_user.id,
        skip=pagination.offset,
        limit=pagination.page_size,
        tx_type=tx_type,
        category=category,
        source_type=source_type,
        start_time=parsed_start,
        end_time=parsed_end,
    )

    total = await point_transaction.count_by_user_id(
        db,
        user_id=current_user.id,
        tx_type=tx_type,
        category=category,
        source_type=source_type,
        start_time=parsed_start,
        end_time=parsed_end,
    )

    return success_response(
        data=PointTransactionListResponse(
            items=[PointTransactionItem.model_validate(t) for t in items],
            total=total,
            skip=pagination.offset,
            limit=pagination.page_size,
        )
    )


# ── 充值 ──────────────────────────────────────────────

@router.post("/recharge", response_model=ApiResponse[RechargeResponse])
async def create_recharge_order(
    request: RechargeRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),

):
    """
    创建积分充值订单（微信支付 Native 扫码）

    1. 创建本地订单记录
    2. 调用微信统一下单获取二维码链接 code_url
    3. 前端用 code_url 生成二维码，用户微信扫码支付
    4. 支付成功后微信异步通知 /recharge/notify
    """
    logger.info(
        f"[Points] 用户 {current_user.id} 发起充值: {request.points} 积分, "
        f"金额: {request.amount_rmb} 分"
    )

    # 创建待支付订单
    from app.models.point_recharge_order import PointRechargeOrder

    order = PointRechargeOrder(
        user_id=current_user.id,
        points=request.points,
        amount_rmb=request.amount_rmb,
        status="pending",
        trade_type="NATIVE",
    )
    db.add(order)
    await db.flush()

    # 生成商户订单号
    out_trade_no = f"MJZ{order.id:012d}"
    order.out_trade_no = out_trade_no

    # 二维码有效期 2 分钟（与前端轮询对齐）
    from datetime import datetime, timedelta, timezone

    # 前端倒计时用 UTC ISO 格式，不受服务器时区影响
    expire_at = datetime.now(timezone.utc) + timedelta(minutes=2)
    # 微信 time_expire 要求北京时间（UTC+8），格式 yyyyMMddHHmmss
    beijing_tz = timezone(timedelta(hours=8))
    time_expire = expire_at.astimezone(beijing_tz).strftime("%Y%m%d%H%M%S")

    # 调用微信支付统一下单
    try:
        from app.services.wxpay_service import WechatPayError, get_wxpay_service

        wxpay = get_wxpay_service()

        # 从 request 获取 http_client（FastAPI 依赖注入方式获取不了，改用直接引用）
        # 这里用默认的 httpx client
        async with httpx.AsyncClient(timeout=httpx.Timeout(30.0, connect=10.0)) as client:
            wx_result = await wxpay.native_order(
                client,
                description=f"积分充值 {request.points} 积分",
                out_trade_no=out_trade_no,
                amount=request.amount_rmb,
                attach=str(current_user.id),
                time_expire=time_expire,
            )

        # 记录微信返回
        order.request_response = str(wx_result)
        code_url = wx_result.get("code_url")

        if not code_url:
            logger.error(f"[Points] 微信统一下单未返回 code_url: {wx_result}")
            order.status = "failed"
            order.error_msg = "微信未返回二维码链接"
            raise HTTPException(status_code=500, detail="微信支付下单失败")

        order.prepay_id = wx_result.get("prepay_id")
        await db.commit()

        return success_response(
            data=RechargeResponse(
                order_id=order.id,
                points=request.points,
                amount_rmb=request.amount_rmb,
                code_url=code_url,
                expire_at=expire_at.isoformat(),
            ),
            message="充值订单已创建，请扫描微信二维码完成支付",
        )

    except WechatPayError as e:
        logger.error(f"[Points] 微信统一下单失败: {e}")
        order.status = "failed"
        order.error_code = e.code
        order.error_msg = str(e)
        await db.commit()
        raise HTTPException(status_code=500, detail=f"微信支付下单失败: {e}")

    except HTTPException:
        raise
    except Exception as e:
        logger.exception(f"[Points] 创建充值订单异常: {e}")
        order.status = "failed"
        order.error_msg = str(e)
        await db.commit()
        raise HTTPException(status_code=500, detail="创建充值订单失败")


@router.post("/recharge/notify")
async def handle_wxpay_notify(
    request: Request,
    db: AsyncSession = Depends(get_db),
):
    """
    微信支付回调通知

    微信服务器在支付成功后推送通知到此端点。
    验证签名 → 更新订单 → 给用户充值积分。
    必须返回 200 且 body 为 {"code": "SUCCESS"}，否则微信会重试。

    注意：此接口不设置 response_model，直接返回原始 JSON，
          避免 FastAPI 用 ApiResponse 包装导致微信无法识别。
    """

    def _wx_response() -> JSONResponse:
        """构造微信要求的回调响应"""
        return JSONResponse(content={"code": "SUCCESS", "message": "OK"})

    # 读取回调原始 body（APIv2 为 XML 格式）
    body_bytes = await request.body()
    body_str = body_bytes.decode("utf-8")

    logger.info(f"[WechatPay] 收到回调通知: body={body_str[:200]}")

    wxpay = get_wxpay_service()

    # 解析 XML
    try:
        notify_data = wxpay._xml_to_dict(body_str)
    except Exception as e:
        logger.error(f"[WechatPay] XML 解析失败: {e}, body={body_str[:200]}")
        return _wx_response()

    # 验签（APIv2：从 XML 中的 sign 字段验 MD5 签名）
    try:
        verified = wxpay.verify_notify(notify_data)
    except WechatPayError as e:
        logger.error(f"[WechatPay] 回调验签失败: {e}")
        return _wx_response()

    if not verified:
        logger.error("[WechatPay] 回调签名验证未通过")
        return _wx_response()

    # APIv2 回调不加密，直接提取字段
    out_trade_no = notify_data.get("out_trade_no")
    wx_order_no = notify_data.get("transaction_id")
    trade_state = notify_data.get("result_code", "")

    if not out_trade_no:
        logger.error("[WechatPay] 回调缺少 out_trade_no")
        return _wx_response()

    # 查找订单
    order = await point_recharge_order.get_by_out_trade_no(
        db, out_trade_no=out_trade_no
    )
    if not order:
        logger.error(f"[WechatPay] 回调订单不存在: {out_trade_no}")
        return _wx_response()

    # 记录回调原始内容
    order.notify_raw = body_str
    order.notify_verified = True
    order.wx_order_no = wx_order_no

    # 只处理支付成功状态
    if trade_state != "SUCCESS":
        logger.info(f"[WechatPay] 订单 {out_trade_no} 状态: {trade_state}，暂不处理")
        if trade_state in ("CLOSED", "REVOKED"):
            order.status = "closed"
            await db.commit()
        return _wx_response()

    # 幂等：已处理过的订单不再重复充值
    if order.status == "paid":
        logger.info(f"[WechatPay] 订单 {out_trade_no} 已处理，跳过")
        await db.commit()  # 提交 notify_raw 等记录
        return _wx_response()

    # 更新订单状态并充值积分（同一事务）
    try:
        order.status = "paid"
        order.paid_at = datetime.now(UTC)

        # 给用户充值积分
        await point_service.recharge(
            db,
            user_id=order.user_id,
            points=order.points,
            source="wxpay",
            description=f"微信支付充值 {order.points} 积分",
            order_id=order.id,
        )

        await db.commit()

        logger.info(
            f"[WechatPay] 订单 {out_trade_no} 处理完成，"
            f"用户 {order.user_id} 充值 {order.points} 积分"
        )

    except Exception as e:
        await db.rollback()
        logger.exception(f"[WechatPay] 订单 {out_trade_no} 充值积分失败: {e}")
        # 记录错误但不抛出，返回 SUCCESS 避免微信重试
        order.error_msg = f"充值积分失败: {e}"
        await db.commit()

    return _wx_response()


@router.get("/recharge/query/{order_id}", response_model=ApiResponse[dict])
async def query_recharge_status(
    order_id: int,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """
    查询充值订单支付状态（前端轮询用）

    如果订单仍在 pending 状态，会主动查询微信支付确认最新状态。
    """

    order = await point_recharge_order.get(db, id=order_id)
    if not order or order.user_id != current_user.id:
        raise HTTPException(status_code=404, detail="订单不存在")

    # 如果是 pending，主动查询微信支付
    if order.status == "pending" and order.out_trade_no:
        try:
            from app.services.wxpay_service import WechatPayError, get_wxpay_service

            wxpay = get_wxpay_service()
            async with httpx.AsyncClient(timeout=httpx.Timeout(30.0, connect=10.0)) as client:
                wx_result = await wxpay.query_order(
                    client, out_trade_no=order.out_trade_no
                )

            order.query_result = str(wx_result)
            trade_state = wx_result.get("trade_state", "")

            if trade_state == "SUCCESS" and order.status != "paid":
                # 支付成功但本地未处理，补发积分
                order.status = "paid"
                order.paid_at = datetime.now(UTC)
                order.wx_order_no = wx_result.get("transaction_id")

                await point_service.recharge(
                    db,
                    user_id=order.user_id,
                    points=order.points,
                    source="wxpay",
                    description=f"微信支付充值 {order.points} 积分（主动查询补单）",
                    order_id=order.id,
                )
                logger.info(
                    f"[Points] 订单 {order.out_trade_no} 通过主动查询确认支付成功，"
                    f"补发 {order.points} 积分"
                )

            elif trade_state in ("CLOSED", "REVOKED"):
                order.status = "closed"

            await db.commit()

        except WechatPayError as e:
            logger.warning(f"[Points] 主动查询订单 {order.out_trade_no} 失败: {e}")
        except Exception as e:
            logger.exception(f"[Points] 主动查询订单异常: {e}")

    return success_response(
        data={
            "order_id": order.id,
            "status": order.status,
            "points": order.points,
            "amount_rmb": order.amount_rmb,
            "paid_at": order.paid_at.isoformat() if order.paid_at else None,
            "wx_order_no": order.wx_order_no,
        }
    )


# ── 充值档位查询 ──────────────────────────────────────

@router.get("/recharge-options", response_model=ApiResponse[list[dict]])
async def get_recharge_options(
    current_user: User = Depends(get_current_user),
):
    """
    获取充值档位配置（由后端控制，支持积分赠送）。

    前端充值弹窗调用此接口展示可选档位，无需硬编码。
    """
    options = point_service.get_recharge_options()
    return success_response(data=options, message="获取充值档位成功")


# ── 扣费业务类型查询 ──────────────────────────────────

@router.get("/chargeable-types", response_model=ApiResponse[list[str]])
async def get_chargeable_types(
    current_user: User = Depends(get_current_user),
):
    """
    获取所有需要扣费的业务类型列表。

    用于前端积分明细页面的类型筛选下拉框，只展示会产生积分消耗的业务。
    免费业务（如字幕生成 caption）不包含在返回列表中。
    """
    types = point_service.get_chargeable_source_types()
    return success_response(data=types, message="获取扣费业务类型成功")


# ── 积分规则查询 ──────────────────────────────────────

@router.get("/rules", response_model=ApiResponse[list[dict]])
async def get_points_rules(
    current_user: User = Depends(get_current_user),
):
    """
    获取积分计费规则列表。

    返回所有业务的积分消耗规则，供前端在操作按钮上展示积分提示。
    """
    rules = []
    for source_type, cfg in point_service.POINTS_CONFIG.items():
        if source_type.startswith("_"):
            continue
        rule = {
            "source_type": source_type,
            "mode": cfg["mode"],
        }
        if cfg["mode"] == "fixed":
            rule["points"] = cfg["points"]
        elif cfg["mode"] == "duration":
            rule["min_points"] = cfg.get("min_points", 1)
            if "divisor" in cfg:
                rule["unit"] = f"每 {cfg['divisor']} 秒"
                rule["points_per_unit"] = 1
            if "multiplier" in cfg:
                rule["unit"] = "每秒"
                rule["points_per_unit"] = cfg["multiplier"]
        rules.append(rule)
    return success_response(data=rules, message="获取积分规则成功")


# ── 积分预估查询 ──────────────────────────────────────

@router.get("/cost")
async def get_cost(
    source_type: str,
    seconds: int = 0,
    char_count: int = 0,
    total_seconds: int = 0,
    input_seconds: int = 0,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """
    查询某操作所需积分（预估上限和实际计费规则），并附带余额检查。

    用于前端在执行业务前预估所需积分，做余额检查。
    """
    try:
        # 构建预估参数
        estimate_param = {}
        if source_type == "tts":
            estimate_param["char_count"] = char_count
        elif source_type in ("video", "caption"):
            estimate_param["input_seconds"] = input_seconds
        elif source_type == "compose":
            estimate_param["total_seconds"] = total_seconds

        estimated = point_service._estimate_max_cost(source_type, estimate_param)

        # 实际计费（按传入秒数计算）
        actual_param = {"seconds": seconds}
        actual = point_service._calculate_cost(source_type, actual_param)

        # 余额检查
        balance_info = await point_service.check_balance(
            db, current_user.id, required_points=estimated
        )

        return success_response(
            data={
                "source_type": source_type,
                "estimated_points": estimated,
                "actual_points": actual,
                "sufficient": balance_info["sufficient"],
                "balance": balance_info["balance"],
                "required": balance_info["required"],
            },
            message="积分预估查询成功",
        )
    except ValueError as e:
        raise HTTPException(status_code=400, detail=str(e))


# ── 直接消费扣费（前端/Rust 层调用）───────────────────

@router.post("/consume", response_model=ApiResponse[dict])
async def consume_points(
    request: ConsumeRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """
    直接消费积分（不经过冻结）

    用于 Rust/前端层业务在执行本地操作前扣费：
    - compose（压制成片）
    - subtitle_burn（字幕烧录）
    - cover_design（封面设计）

    余额不足时返回 402，前端应拦截并引导充值。
    """
    try:
        tx = await point_service.consume(
            db,
            user_id=current_user.id,
            points=request.points,
            source_type=request.source_type,
            source_id=request.source_id,
            description=f"【{request.description or request.source_type}】",
            allow_negative=False,
        )
    except ValueError as e:
        # 余额不足（在同一事务内判断，避免竞态）
        if "积分不足" in str(e):
            raise HTTPException(status_code=402, detail=str(e))
        raise HTTPException(status_code=400, detail=str(e))
    await db.commit()

    return success_response(
        data={
            "transaction_id": tx.id,
            "consumed_points": tx.amount,
            "balance_after": tx.balance_after,
            "source_type": tx.source_type,
        },
        message="消费成功",
    )


# ── 充值订单查询 ──────────────────────────────────────

@router.get("/orders", response_model=ApiResponse[RechargeOrderListResponse])
async def list_recharge_orders(
    pagination: PaginationParams = Depends(),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """获取当前用户充值订单列表"""
    items = await point_recharge_order.get_by_user_id(
        db,
        user_id=current_user.id,
        skip=pagination.offset,
        limit=pagination.page_size,
    )

    total = len(items)

    return success_response(
        data=RechargeOrderListResponse(
            items=[RechargeOrderItem.model_validate(o) for o in items],
            total=total,
            skip=pagination.offset,
            limit=pagination.page_size,
        )
    )