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package federation
//
// GangGo Federation Library
// Copyright (C) 2017-2018 Lukas Matt <lukas@zauberstuhl.de>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
//

import "crypto/rsa"

// MessageType defines what kind of message we are dealing with
type MessageType struct {
  Proto Protocol
  Entity EntityType
}

// Message is the main interface for handling requests. It will be returned
// by all [...]Parse(...) functions e.g. DiasporaParse() or ActivityPubParse()
type Message interface {
  ValidSignature(*rsa.PublicKey) bool
  Type() MessageType
  Entity() MessageBase
}

// MessageBase is the minimum what a entity has to support/implement
type MessageBase interface {
  Author() string
  SetAuthor(string)
  Unmarshal([]byte) error
  Type() MessageType
  Marshal(*rsa.PrivateKey, *rsa.PublicKey) ([]byte, error)
  Send(string, *rsa.PrivateKey, *rsa.PublicKey) error
}

// NewMessagePost will return a MessagePost interface depending on the specified Protocol
func NewMessagePost(proto Protocol) (MessagePost, error) {
  switch proto {
  case DiasporaProtocol:
    return &DiasporaStatusMessage{}, nil
  case ActivityPubProtocol:
    return &ActivityPubCreatePost{}, nil
  default:
    return nil, ERR_NOT_IMPLEMENTED
  }
}

// NewMessageReshare will return a MessageReshare interface depending on the specified Protocol
func NewMessageReshare(proto Protocol) (MessageReshare, error) {
  switch proto {
  case DiasporaProtocol:
    return &DiasporaReshare{}, nil
  default:
    return nil, ERR_NOT_IMPLEMENTED
  }
}

// NewMessageComment will return a MessageComment interface depending on the specified Protocol
func NewMessageComment(proto Protocol) (MessageComment, error) {
  switch proto {
  case DiasporaProtocol:
    return &DiasporaComment{}, nil
  case ActivityPubProtocol:
    return &ActivityPubCreateComment{}, nil
  default:
    return nil, ERR_NOT_IMPLEMENTED
  }
}

// NewMessageLike will return a MessageLike interface depending on the specified Protocol
func NewMessageLike(proto Protocol) (MessageLike, error) {
  switch proto {
  case DiasporaProtocol:
    return &DiasporaLike{}, nil
  case ActivityPubProtocol:
    return &ActivityPubLike{}, nil
  default:
    return nil, ERR_NOT_IMPLEMENTED
  }
}

// NewMessageContact will return a MessageContact interface depending on the specified Protocol
func NewMessageContact(proto Protocol) (MessageContact, error) {
  switch proto {
  case DiasporaProtocol:
    return &DiasporaContact{}, nil
  case ActivityPubProtocol:
    return &ActivityPubFollow{}, nil
  default:
    return nil, ERR_NOT_IMPLEMENTED
  }
}

// NewMessageRetract will return a MessageRetract interface depending on the specified Protocol
func NewMessageRetract(proto Protocol) (MessageRetract, error) {
  switch proto {
  case DiasporaProtocol:
    return &DiasporaRetraction{}, nil
  case ActivityPubProtocol:
    return &ActivityPubRetract{}, nil
  default:
    return nil, ERR_NOT_IMPLEMENTED
  }
}