syntax = "proto3";

package threads;

option go_package = "./proto;threads";

service Threads {
	// Create a thread
	rpc CreateThread(CreateThreadRequest) returns (CreateThreadResponse);
	// Read a thread using its ID, can filter using group ID if provided
	rpc ReadThread(ReadThreadRequest) returns (ReadThreadResponse);
	// Update a threads topic
	rpc UpdateThread(UpdateThreadRequest) returns (UpdateThreadResponse);
	// Delete a thread and all the messages within
	rpc DeleteThread(DeleteThreadRequest) returns (DeleteThreadResponse);
	// List all the threads for a group
	rpc ListThreads(ListThreadsRequest) returns (ListThreadsResponse);
	// Create a message within a thread
	rpc CreateMessage(CreateMessageRequest) returns (CreateMessageResponse);
	// List the messages within a thread in reverse chronological order, using sent_before to
	// offset as older messages need to be loaded
	rpc ListMessages(ListMessagesRequest) returns (ListMessagesResponse);
	// RecentMessages returns the most recent messages in a group of threads. By default the 
	// most messages retrieved per thread is 25, however this can be overriden using the 
	// limit_per_thread option
	rpc RecentMessages(RecentMessagesRequest) returns (RecentMessagesResponse);
}

message Thread {
	string id = 1;
	string group_id = 2;
	string topic = 3;
	string created_at = 4;
}

message Message {
	string id = 1;
	string author_id = 2;
	string thread_id = 3;
	string text = 4;
	string sent_at = 5;
}

message CreateThreadRequest {
	string group_id = 1;
	string topic = 2;
}

message CreateThreadResponse {
	Thread thread = 1;
}

message ReadThreadRequest {
	string id = 1;
	string group_id = 2;
}

message ReadThreadResponse {
	Thread thread = 1;
}

message ListThreadsRequest {
	string group_id = 1;
}

message ListThreadsResponse {
	repeated Thread threads = 1;
}

message UpdateThreadRequest {
	string id = 1;
	string topic = 2;
}

message UpdateThreadResponse {
	Thread thread = 1;
}

message DeleteThreadRequest {
	string id = 1;
}

message DeleteThreadResponse {}

message CreateMessageRequest {
	string id = 1;
	string thread_id = 2;
	string author_id = 3;
	string text = 4;
}

message CreateMessageResponse {
	Message message = 1;
}

message ListMessagesRequest {
	string thread_id = 1;
	int64 limit = 2;
	int64 offset = 3;
	string order = 4;
}

message ListMessagesResponse {
	repeated Message messages = 1;
}

message RecentMessagesRequest {
	repeated string thread_ids = 1;
	int64 limit_per_thread = 2;
}

message RecentMessagesResponse {
	repeated Message messages = 1;
}