plugin

type API interface {
	// LoadPluginConfiguration loads the plugin's configuration. dest should be a pointer to a
	// struct that the configuration JSON can be unmarshalled to.
	LoadPluginConfiguration(dest interface{}) error

	// RegisterCommand registers a custom slash command. When the command is triggered, your plugin
	// can fulfill it via the ExecuteCommand hook.
	RegisterCommand(command *model.Command) error

	// UnregisterCommand unregisters a command previously registered via RegisterCommand.
	UnregisterCommand(teamId, trigger string) error

	// CreateUser creates a user.
	CreateUser(user *model.User) (*model.User, *model.AppError)

	// DeleteUser deletes a user.
	DeleteUser(userId string) *model.AppError

	// GetUser gets a user.
	GetUser(userId string) (*model.User, *model.AppError)

	// GetUserByEmail gets a user by their email address.
	GetUserByEmail(email string) (*model.User, *model.AppError)

	// GetUserByUsername gets a user by their username.
	GetUserByUsername(name string) (*model.User, *model.AppError)

	// UpdateUser updates a user.
	UpdateUser(user *model.User) (*model.User, *model.AppError)

	// CreateTeam creates a team.
	CreateTeam(team *model.Team) (*model.Team, *model.AppError)

	// DeleteTeam deletes a team.
	DeleteTeam(teamId string) *model.AppError

	// GetTeam gets a team.
	GetTeam(teamId string) (*model.Team, *model.AppError)

	// GetTeamByName gets a team by its name.
	GetTeamByName(name string) (*model.Team, *model.AppError)

	// UpdateTeam updates a team.
	UpdateTeam(team *model.Team) (*model.Team, *model.AppError)

	// CreateChannel creates a channel.
	CreateChannel(channel *model.Channel) (*model.Channel, *model.AppError)

	// DeleteChannel deletes a channel.
	DeleteChannel(channelId string) *model.AppError

	// GetChannel gets a channel.
	GetChannel(channelId string) (*model.Channel, *model.AppError)

	// GetChannelByName gets a channel by its name.
	GetChannelByName(name, teamId string) (*model.Channel, *model.AppError)

	// GetDirectChannel gets a direct message channel.
	GetDirectChannel(userId1, userId2 string) (*model.Channel, *model.AppError)

	// GetGroupChannel gets a group message channel.
	GetGroupChannel(userIds []string) (*model.Channel, *model.AppError)

	// UpdateChannel updates a channel.
	UpdateChannel(channel *model.Channel) (*model.Channel, *model.AppError)

	// AddChannelMember creates a channel membership for a user.
	AddChannelMember(channelId, userId string) (*model.ChannelMember, *model.AppError)

	// GetChannelMember gets a channel membership for a user.
	GetChannelMember(channelId, userId string) (*model.ChannelMember, *model.AppError)

	// UpdateChannelMemberRoles updates a user's roles for a channel.
	UpdateChannelMemberRoles(channelId, userId, newRoles string) (*model.ChannelMember, *model.AppError)

	// UpdateChannelMemberNotifications updates a user's notification properties for a channel.
	UpdateChannelMemberNotifications(channelId, userId string, notifications map[string]string) (*model.ChannelMember, *model.AppError)

	// DeleteChannelMember deletes a channel membership for a user.
	DeleteChannelMember(channelId, userId string) *model.AppError

	// CreatePost creates a post.
	CreatePost(post *model.Post) (*model.Post, *model.AppError)

	// DeletePost deletes a post.
	DeletePost(postId string) *model.AppError

	// GetPost gets a post.
	GetPost(postId string) (*model.Post, *model.AppError)

	// UpdatePost updates a post.
	UpdatePost(post *model.Post) (*model.Post, *model.AppError)

	// KeyValueStore returns an object for accessing the persistent key value storage.
	KeyValueStore() KeyValueStore
}

type Hooks interface {
	// OnActivate is invoked when the plugin is activated. Implementations will usually want to save
	// the api argument for later use. Loading configuration for the first time is also a commonly
	// done here.
	OnActivate(API) error

	// OnDeactivate is invoked when the plugin is deactivated. This is the plugin's last chance to
	// use the API, and the plugin will be terminated shortly after this invocation.
	OnDeactivate() error

	// OnConfigurationChange is invoked when configuration changes may have been made.
	OnConfigurationChange() error

	// ServeHTTP allows the plugin to implement the http.Handler interface. Requests destined for
	// the /plugins/{id} path will be routed to the plugin.
	//
	// The Mattermost-User-Id header will be present if (and only if) the request is by an
	// authenticated user.
	ServeHTTP(http.ResponseWriter, *http.Request)

	// ExecuteCommand executes a command that has been previously registered via the RegisterCommand
	// API.
	ExecuteCommand(args *model.CommandArgs) (*model.CommandResponse, *model.AppError)

	// MessageWillBePosted is invoked when a message is posted by a user before it is commited
	// to the database. If you also want to act on edited posts, see MessageWillBeUpdated.
	// Return values should be the modified post or nil if rejected and an explanation for the user.
	//
	// If you don't need to modify or reject posts, use MessageHasBeenPosted instead.
	//
	// Note that this method will be called for posts created by plugins, including the plugin that
	// created the post.
	MessageWillBePosted(post *model.Post) (*model.Post, string)

	// MessageWillBeUpdated is invoked when a message is updated by a user before it is commited
	// to the database. If you also want to act on new posts, see MessageWillBePosted.
	// Return values should be the modified post or nil if rejected and an explanation for the user.
	// On rejection, the post will be kept in its previous state.
	//
	// If you don't need to modify or rejected updated posts, use MessageHasBeenUpdated instead.
	//
	// Note that this method will be called for posts updated by plugins, including the plugin that
	// updated the post.
	MessageWillBeUpdated(newPost, oldPost *model.Post) (*model.Post, string)

	// MessageHasBeenPosted is invoked after the message has been commited to the databse.
	// If you need to modify or reject the post, see MessageWillBePosted
	// Note that this method will be called for posts created by plugins, including the plugin that
	// created the post.
	MessageHasBeenPosted(post *model.Post)

	// MessageHasBeenUpdated is invoked after a message is updated and has been updated in the databse.
	// If you need to modify or reject the post, see MessageWillBeUpdated
	// Note that this method will be called for posts created by plugins, including the plugin that
	// created the post.
	MessageHasBeenUpdated(newPost, oldPost *model.Post)
}

type KeyValueStore interface {
	// Set will store a key-value pair, unique per plugin.
	Set(key string, value []byte) *model.AppError

	// Get will retrieve a value based on the key. Returns nil for non-existent keys.
	Get(key string) ([]byte, *model.AppError)

	// Delete will remove a key-value pair. Returns nil for non-existent keys.
	Delete(key string) *model.AppError
}

type Supervisor interface {
	Start(API) error
	Wait() error
	Stop() error
	Hooks() Hooks
}