package logic

import (
	"context"

	"muyu-apiserver/pkg/metrics"
	"muyu-apiserver/pkg/tenantctx"
	"muyu-apiserver/rpc/inventory/internal/svc"
	"muyu-apiserver/rpc/inventory/pb"

	"github.com/zeromicro/go-zero/core/logx"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
)

type ApproveStockAdjustLogic struct {
	ctx    context.Context
	svcCtx *svc.ServiceContext
	logx.Logger
}

func NewApproveStockAdjustLogic(ctx context.Context, svcCtx *svc.ServiceContext) *ApproveStockAdjustLogic {
	return &ApproveStockAdjustLogic{
		ctx:    ctx,
		svcCtx: svcCtx,
		Logger: logx.WithContext(ctx),
	}
}

func (l *ApproveStockAdjustLogic) ApproveStockAdjust(in *pb.ApproveStockAdjustReq) (*pb.Empty, error) {
	adjust, err := l.svcCtx.StockAdjustModel.FindOneByAdjustId(l.ctx, in.AdjustId)
	if err != nil {
		return nil, status.Error(codes.NotFound, "stock adjust not found")
	}

	if adjust.Status != 0 {
		return nil, status.Error(codes.FailedPrecondition, "stock adjust is not in pending status")
	}

	adjust.Approver = in.Approver

	switch in.Action {
	case 1: // approve
		// In the three-layer model, actual stock adjustments are done via
		// SaveBolts/SavePans. Approving records the approval decision only.
		adjust.Status = 1
	case 2: // reject
		adjust.Status = 2
	default:
		return nil, status.Errorf(codes.InvalidArgument, "unsupported action: %d", in.Action)
	}

	err = l.svcCtx.StockAdjustModel.Update(l.ctx, adjust)
	if err != nil {
		return nil, status.Error(codes.Internal, err.Error())
	}

	tenantId := tenantctx.ExtractTenantId(l.ctx)
	actionLabel := "approve"
	if in.Action == 2 {
		actionLabel = "reject"
	}
	metrics.StockAdjustApprovedTotal.WithLabelValues(tenantId, actionLabel).Inc()

	return &pb.Empty{}, nil
}