package dinet

import (
	"errors"
	"io"
	"time"

	"src.dualinventive.com/go/dinet/rpc"
	"src.dualinventive.com/go/lib/dilog"
)

// ErrInvalidTransportType is returned when the callback Transport returns an invalid transport type
var ErrInvalidTransportType = errors.New("invalid transport type")

// VersionCallback is a callback function which returns all device version numbers
type VersionCallback func() (rpc.VersionMap, rpc.ErrorCode)

// ConfigSetCallback is a callback type for config:set operations
type ConfigSetCallback func(rpc.ConfigParam) rpc.ErrorCode

// ConfigResetCallback is a callback type for config:reset operations
type ConfigResetCallback func() rpc.ErrorCode

type deviceConfig struct {
	c     rpc.Config
	get   RPCCallback
	set   ConfigSetCallback
	reset ConfigResetCallback
}

// Device is the most basic dinet device
type Device interface {
	io.Closer
	UID() string
}

// DeviceInfo contains information about the device. This is used for the ChildDevice
type DeviceInfo interface {
	Device
	Versions() (rpc.VersionMap, rpc.ErrorCode)
	TimeoutDuration() time.Duration
	Transport() (interface{}, rpc.ErrorCode)
	Type() rpc.DeviceType
}

// ParentDevice is a dinet devices that can contains children
type ParentDevice interface {
	Device
	// RegisterUID is called when the child device wants to register his UID on the connection. No administration
	// is allowed
	RegisterUID(uid string) error
	// UnregisterUID is called when the child device wants to unregister his UID on the connection. No
	// administration is allowed
	UnregisterUID(uid string) error
	// RegisterDevice is called when the child device wants to register. You can change your administration and
	// call RegisterUID after your administration
	RegisterDevice(device Device) error
	// UnregisterDevice is called when the child device wants to unregister. You can change your administration
	// and call UnregisterUID after your administration
	UnregisterDevice(uid string) error
	// Router returns the router which the child can use to subscribe to events
	Router() *Router
	// Logger returns a logger which the child can use to log data. It is the childs responsibility to rewrite the
	// device:uid and device:type fields
	Logger() dilog.Logger
	// Search searches the uid in the children
	Search(uid string) (Device, error)
}