package usermanager

import (
	"context"
	"errors"
	"math/rand"

	"github.com/getlantern/deepcopy"

	gamelangpb "git.alfi.li/gamelang/protobuf/gamelang"
)

type UserServer struct {
	gamelangpb.UnimplementedUserServiceServer

	usermanager *UserManager
}

func NewUserServer(um *UserManager) *UserServer {
	return &UserServer{usermanager: um}
}

func (us UserServer) CreateUser(ctx context.Context, user *gamelangpb.User) (*gamelangpb.User, error) {
	id := rand.Uint32()
	name := user.GetName()
	password := string(user.GetPassword())
	_, err := us.usermanager.Create(id, name, password)
	if err != nil {
		return &gamelangpb.User{}, err
	}
	return user, nil
}

func (us UserServer) DeleteUser(ctx context.Context, user *gamelangpb.User) (*gamelangpb.User, error) {
	us.usermanager.Remove(user.GetName())
	return user, nil
}

func (us UserServer) GetUser(ctx context.Context, user *gamelangpb.User) (*gamelangpb.User, error) {
	users := us.usermanager.List()
	for _, userB := range users {
		if user.GetName() == userB.GetName() {
			returnUser := &gamelangpb.User{}
			deepcopy.Copy(userB, returnUser)
			returnUser.Password = []byte{}
			return returnUser, nil
		}
	}
	return &gamelangpb.User{}, errors.New("User not found")
}

func (us UserServer) ListUser(user *gamelangpb.User, stream gamelangpb.UserService_ListUserServer) error {
	users := us.usermanager.List()
	for _, user := range users {
		stream.Send(&user)
	}
	return nil
}

func (us UserServer) CheckUser(ctx context.Context, user *gamelangpb.User) (*gamelangpb.User, error) {
	if _, ok := us.usermanager.CheckUser(user.GetName(), string(user.GetPassword())); ok {
		return user, nil
	}
	return &gamelangpb.User{}, errors.New("user not found or password missmatch")
}