package summary

import (
	"context"
	"time"

	"bsm/full/module/ec/order/internal/impl"
	"bsm/full/module/ec/order/internal/models"
	pb "bsm/full/module/ec/order/pb"

	"git.apinb.com/bsm-sdk/core/errcode"
	"git.apinb.com/bsm-sdk/core/printer"
	"git.apinb.com/bsm-sdk/core/service"
)

// 确认订单，物流，优惠卷等其它信息
func Confirm(ctx context.Context, in *pb.ConfirmRequest) (reply *pb.ConfirmReply, err error) {
	// parse authorization meta.
	auth, err := service.ParseMetaCtx(ctx, nil)
	if err != nil {
		return nil, err
	}

	var (
		logisFee     int64 = 0
		couponAmount int64 = 0
		summary            = new(models.OrderSummary)
		coupon             = new(models.OrderCoupon)
	)

	err = impl.DBService.Where("order_no = ?", in.OrderNo).First(&summary).Error
	if err != nil {
		printer.Error(err.Error())
		return nil, errcode.ErrDB
	}

	if in.AddressIdentity != "" {
		/*
			err = impl.DBService.Where("id=?", in.AddressId).First(&address).Error
			if err == nil {
				summary.Address = address.Detail
				summary.County = address.Country
				summary.Province = address.Province
				summary.City = address.City
				summary.Area = address.Area
				summary.Contact = address.Contact
				summary.Phone = address.Phone
				logisFee = GetLogisticsFee(summary.TotalPrice, address.Province)
			}
		*/
	}
	if logisFee > 0 {
		summary.TotalPrice = summary.TotalPrice + logisFee
	}

	if in.CouponIdentity != "" {
		err = impl.DBService.Where("identity=?", in.CouponIdentity).First(&coupon).Error
		if err != nil {
			printer.Error(err.Error())
			return nil, errcode.ErrRecordNotFound
		}
		// 校验优惠券归属：passport_id 或 passport_identity 命中调用者才算本人所有。
		if coupon.PassportIdentity != auth.Identity && coupon.PassportID != auth.ID {
			return nil, errcode.ErrPermissionDenied
		}
		// 校验使用状态：仅可用的优惠券（status=2）可使用。
		if coupon.Status != 2 {
			return nil, errcode.ErrUnavailable
		}
		// 校验有效期：started/expired 为字符串，格式可解析时强制校验，无法解析时跳过。
		now := time.Now()
		if started, ok := parseCouponTime(coupon.Started); ok && now.Before(started) {
			return nil, errcode.ErrUnavailable
		}
		if expired, ok := parseCouponTime(coupon.Expired); ok && now.After(expired) {
			return nil, errcode.ErrUnavailable
		}
		// 核销优惠券：带状态条件更新并检查影响行数，避免重复使用同一张券。
		result := impl.DBService.Model(&models.OrderCoupon{}).Where("identity = ? AND status = 2", in.CouponIdentity).Update("status", 3)
		if result.Error != nil {
			printer.Error(result.Error.Error())
			return nil, errcode.ErrDB
		}
		if result.RowsAffected == 0 {
			return nil, errcode.ErrUnavailable
		}
		couponAmount = coupon.Amount
	}

	if couponAmount > 0 {
		// 优惠券为减免项，抵扣后总额不得为负：抵扣额不超过订单金额。
		if couponAmount >= summary.TotalPrice {
			summary.TotalPrice = 0
		} else {
			summary.TotalPrice = summary.TotalPrice - couponAmount
		}
		// 回写所用券与其抵扣额，供取消订单时退券使用。
		summary.CouponIdentity = in.CouponIdentity
		summary.CouponAmount = couponAmount
	}

	summary.Status = 1

	// 显式指定需落库的列，保证总额抵扣为 0 时也能写入。
	err = impl.DBService.Where("order_no = ?", in.OrderNo).
		Select("total_price", "coupon_identity", "coupon_amount", "status").
		Updates(summary).Error
	if err != nil {
		printer.Error(err.Error())
		return nil, errcode.ErrDB
	}

	return &pb.ConfirmReply{
		TotalPrice: summary.TotalPrice,
	}, nil
}

// parseCouponTime 解析优惠券 started/expired 时间字段，兼容"2006-01-02 15:04:05"与"2006-01-02"两种格式；
// 无法解析时返回 ok=false，由调用方跳过该项校验。
func parseCouponTime(v string) (time.Time, bool) {
	if v == "" {
		return time.Time{}, false
	}
	for _, layout := range []string{"2006-01-02 15:04:05", "2006-01-02"} {
		if t, err := time.ParseInLocation(layout, v, time.Local); err == nil {
			return t, true
		}
	}
	return time.Time{}, false
}