package service

import (
	"context"

	"github.com/cloudprint/cloudprint-backend/internal/model"
	"github.com/cloudprint/cloudprint-backend/internal/repository"
	"github.com/cloudprint/cloudprint-backend/internal/service"
	pb "github.com/cloudprint/cloudprint-backend/proto/generated"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
	"google.golang.org/protobuf/types/known/timestamppb"
)

type AdminServiceServer struct {
	pb.UnimplementedAdminServiceServer
	authService *service.AuthService
	orderRepo   *repository.OrderRepository
	printerRepo *repository.PrinterRepository
}

func NewAdminServiceServer(
	authService *service.AuthService,
	orderRepo *repository.OrderRepository,
	printerRepo *repository.PrinterRepository,
) *AdminServiceServer {
	return &AdminServiceServer{
		authService: authService,
		orderRepo:   orderRepo,
		printerRepo: printerRepo,
	}
}

func (s *AdminServiceServer) Login(ctx context.Context, req *pb.AdminLoginRequest) (*pb.AdminLoginResponse, error) {
	result, err := s.authService.AdminLogin(ctx, req.Username, req.Password)
	if err != nil {
		return nil, status.Errorf(codes.Unauthenticated, "login failed: %v", err)
	}

	return &pb.AdminLoginResponse{
		AccessToken: result.AccessToken,
		Admin: &pb.Admin{
			Id:       result.Admin.ID,
			Username: result.Admin.Username,
			Nickname: result.Admin.Nickname,
			Role:     int32(result.Admin.Role),
		},
	}, nil
}

func (s *AdminServiceServer) GetStatistics(ctx context.Context, req *pb.GetStatisticsRequest) (*pb.Statistics, error) {
	totalUsers, totalOrders, todayOrders, todayRevenue, pendingOrders, err := s.orderRepo.GetStatistics(ctx)
	if err != nil {
		return nil, status.Errorf(codes.Internal, "get statistics failed: %v", err)
	}

	activePrinters, err := s.printerRepo.CountActive(ctx)
	if err != nil {
		return nil, status.Errorf(codes.Internal, "get printer count failed: %v", err)
	}

	return &pb.Statistics{
		TotalUsers:     int32(totalUsers),
		TotalOrders:    int32(totalOrders),
		TodayOrders:    int32(todayOrders),
		TodayRevenue:   todayRevenue,
		PendingOrders:  int32(pendingOrders),
		ActivePrinters: int32(activePrinters),
	}, nil
}

func (s *AdminServiceServer) CreateAdmin(ctx context.Context, req *pb.CreateAdminRequest) (*pb.CreateAdminResponse, error) {
	admin, err := s.authService.CreateAdmin(ctx, req.Username, req.Password, req.Nickname, int8(req.Role))
	if err != nil {
		return nil, status.Errorf(codes.Internal, "create admin failed: %v", err)
	}

	return &pb.CreateAdminResponse{
		Admin: convertAdminToProto(admin),
	}, nil
}

func (s *AdminServiceServer) GetAdminList(ctx context.Context, req *pb.GetAdminListRequest) (*pb.AdminListResponse, error) {
	page := req.Page
	if page <= 0 {
		page = 1
	}
	pageSize := req.PageSize
	if pageSize <= 0 {
		pageSize = 10
	}

	admins, total, err := s.authService.GetAdminList(ctx, int(page), int(pageSize))
	if err != nil {
		return nil, status.Errorf(codes.Internal, "get admin list failed: %v", err)
	}

	pbAdmins := make([]*pb.Admin, len(admins))
	for i, admin := range admins {
		pbAdmins[i] = convertAdminToProto(&admin)
	}

	return &pb.AdminListResponse{
		Admins: pbAdmins,
		Total:  int32(total),
	}, nil
}

func (s *AdminServiceServer) UpdateAdmin(ctx context.Context, req *pb.UpdateAdminRequest) (*pb.Admin, error) {
	admin, err := s.authService.UpdateAdmin(ctx, req.Id, req.Nickname, int8(req.Role))
	if err != nil {
		return nil, status.Errorf(codes.Internal, "update admin failed: %v", err)
	}

	return convertAdminToProto(admin), nil
}

func (s *AdminServiceServer) DeleteAdmin(ctx context.Context, req *pb.DeleteAdminRequest) (*pb.Empty, error) {
	if err := s.authService.DeleteAdmin(ctx, req.Id); err != nil {
		return nil, status.Errorf(codes.Internal, "delete admin failed: %v", err)
	}

	return &pb.Empty{}, nil
}

// convertAdminToProto 将model.Admin转换为pb.Admin
func convertAdminToProto(admin *model.Admin) *pb.Admin {
	return &pb.Admin{
		Id:        admin.ID,
		Username:  admin.Username,
		Nickname:  admin.Nickname,
		Role:      int32(admin.Role),
		CreatedAt: timestamppb.New(admin.CreatedAt),
	}
}