/*
	Copyright © 2015 Gluzskiy Alexandr (sss)

    This file is part of Unknown Download Manager (UDM).

    UDM 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 2 of the License, or
    (at your option) any later version.

    UDM 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 UDM.  If not, see <http://www.gnu.org/licenses/>.

*/


//TODO: write readable proto description

//ui common proto part begin

enum MODULE_UI_ELEMENT_TYPE {
	UI_EMPTY = 0; //helper type to set empty element
	UI_STR = 1; //ui elements containing strings
	UI_INTEGER = 2; //numeric only ui elements (use strings instead ?)
	UI_PROGRESS_BAR = 3; //generic progress bar
	UI_WINDOW = 4; //ui window ...
	UI_GROUP = 5; //empty ui element to group children together in ui (tabs can be implemented using this type)
}

message module_download_ui_element_info {
	optional MODULE_UI_ELEMENT_TYPE type = 1 [default = UI_EMPTY];
	required int32 id = 2; //internal element id used to get element value (should be unique for every loaded module)
	optional string name = 3 [default = "not set"]; //can be non unique
	optional string description = 4;
	repeated module_download_ui_element_info children = 5;
}

message module_download_menu_element_info {
	required int32 id = 1;
	required string name = 2;
	optional string description = 3;
	optional bool data_required = 4 [default = false];
	repeated module_download_menu_element_info children = 5; //element with children cannot be executed, it's just container
}


message module_download_ui_element_data {
	required int32 ui_id = 1; //should be unique for every loaded module
	required string data = 2;
}

message module_download_ui_data {
	repeated module_download_ui_element_data data = 1;
	required string download_id = 2;
}

message server_download_ui_data_reply {
	required string module_name = 1;
	required module_download_ui_data data = 2;
}

message client_download_ui_data_request {
	required string module_name = 1;
	required string download_id = 2;
	repeated int32 ui_id = 3; //should be unique for for every loaded module
}


//ui common proto part end

//TOOD: extended ui updates subscriptions proto part (ui data messages on timer, e.t.c.)

//ui subscriptions begin

message download_ui_subscription_info {
	optional client_download_ui_data_request download_ui_data = 1;
	optional bool one_shot = 3 [default = false];
	required int64 interval = 4;
}


message download_ui_unsubscription_info {
	required int32 id = 1; //unsubscript from all updates for given id's
}

//ui subscriptions end

//TODO: downloads related proto part

//dowloads proto part begin

message client_download_add_request {
	repeated string_pair params = 1;
}

message client_download_start_request {
	required int32 download_id = 1;
}

message client_download_stop_request {
	required int32 download_id = 1;
}

message client_download_delete_request {
	required int32 download_id = 1;
	optional bool with_data = 2 [default = false];
}

message client_download_action_request {
	required int32 download_id = 1;
	required int32 action_id = 2;
}

message int_string_pair {
	required int32 id = 1;
	required string value = 2;
}
message client_downloads_request {
	repeated int_string_pair params = 1;
}

message client_download_request {
	required int32 download_id = 1;
	repeated int_string_pair params = 2;
}


enum DOWNLOAD_CONTENT_ENTRY_TYPE {
	DOWNLOAD_CONTENT_ENTRY_TYPE_FILE = 0;
	DOWNLOAD_CONTENT_ENTRY_TYPE_DIRECTORY = 1;
}

message download_content_entry {
	required string name = 1;
	optional DOWNLOAD_CONTENT_ENTRY_TYPE type = 2 [default = DOWNLOAD_CONTENT_ENTRY_TYPE_FILE];
	repeated download_content_entry children = 3;
	optional int64 size = 4 [default = 0];
	optional int64 downloaded = 5 [default = 0];
}


message download {
	required int32 id = 1;
	required string name = 2;
	required string module_name = 3;
	optional download_content_entry content = 4;
	required int64 size = 5;
	required int64 downloaded = 6;
}

message server_download_reply {
	required download download = 1;
}


//downloads proto part end

// event subscription part begin
enum SUBSCRIPTION_TYPE {
	SUBSCRIPTION_UI_CHANGE = 0;
	SUBSCRIPTION_SETTING_CHANGE = 1;
}

message client_event_subscription_request {
	required SUBSCRIPTION_TYPE type = 1;
	required string module_name = 2;
	optional download_ui_subscription_info download_ui_info = 3;
}

message client_event_unsubscription_request {
	required SUBSCRIPTION_TYPE type = 1;
	required string module_name = 2;
	optional download_ui_unsubscription_info ui_info = 3;
}

message server_event_subscription_reply {
	required SUBSCRIPTION_TYPE type = 1;
	required string module_name = 2;
	optional download_ui_subscription_info ui_info = 3;

	required bool status = 10;
	optional string status_description = 11;
}

message server_event_unsubscription_reply {
	required SUBSCRIPTION_TYPE type = 1;
	required string module_name = 2;
	optional download_ui_unsubscription_info ui_info = 3;

	required bool status = 10;
	optional string status_description = 11;
}
//event subscription part end


//TODO: settings:
// children ?
// groups ?

//settings common proto part begin

message setting_info {
	optional string default_value = 1 [default = "empty"];
	optional string minimal_value = 2 [default = "not set"];
	optional string maximal_value = 3 [default = "not set"];
	optional string description = 4;
	repeated string dependencies = 5; //list containing all settings which must be turned on for this setting
	repeated string blockers = 6; //list of settings which must be turned of for this setting
}

message setting {
	required string name = 1 [default = "not set"]; //should be unique for every loaded module
	optional setting_info info = 2;
	optional string value = 3 [default = "empty"];
}


//settings common proto part end


//module related messages begin

enum SERVER_MODULE_TYPE {
	SERVER_MODULE_DOWNLOADER = 0;
	SERVER_MODULE_METADATA_STORAGE = 1;
}

message string_pair
{
	required string name = 1;
	required string value = 2;
}


message module_info //general module info for client including settings, download info ui and module specific menus
{
	required SERVER_MODULE_TYPE type = 1;
	required string name = 2; //unique (used as module id)
	required string version = 3;
	optional string description = 4 [default = "no description specified"];
	repeated setting settings = 5;
	repeated module_download_ui_element_info download_info_ui = 6; //always complete here
	repeated module_download_ui_element_info download_creation_ui = 7;
	repeated module_download_menu_element_info download_menu = 8;
	repeated module_download_menu_element_info download_children_menu = 9; //menu for files and folders inside download root, may not present
	repeated string_pair get_downloads_parameters_info = 10;
}

//module related messages end

//core related messages begin

message core_info //core info for client currently for editable server settings, server version and proto version only
{
	optional int32 proto_version = 1 [default = 1];
	required int32 version = 2;
	repeated setting settings = 3;
}

//core related messages end


//auth proto part begin

enum PASSWD_HASH_TYPE {
	HASH_NONE = 0;
	HASH_MD5 = 1;
	HASH_SHA2 = 2;
	HASH_SHA512 = 3;
}

message client_auth_request {
	required bytes password = 1;
	optional PASSWD_HASH_TYPE hash_type = 2 [default = HASH_NONE];
}

message server_auth_reply {
	required bool status = 1; //true == success, false == error
	optional string auth_token = 2; //must be set if no error
	optional string error_description = 3; //readable description must be set on error
}

//auth proto part end

//TODO: large datatransfer proto part
// it should be in separate connection
// it should be very simple
// it should have as small overhead as possible, better none at all
//vaviant 1: client: > request peace of data
//			server: < reply "peace of data" size or error
//			client:  if no error and data size is sane start reading "data size"
//			done, server can handle more commands now

//message client_data_transfer_request {
//}

//message server_data_transfer_reply {
//}

//top level messages begin


enum CLIENT_MSG_TYPE {
    CLIENT_AUTH_REQUEST = 0;
    CLIENT_DATA_TRANSFER_REQUEST = 1;
    CLIENT_UI_DATA_REQUEST = 2;
    CLIENT_MODULES_REQUEST = 3;
    CLIENT_CORE_INFO_REQUEST = 4;
    CLIENT_SUBSCRIPTIONS_REQUEST = 5;
    CLIENT_UNSUBSCRIPTIONS_REQUEST = 6;
    CLIENT_DOWNLOADS_LIST_REQUEST = 7;
    CLIENT_DOWNLOAD_ADD = 8;
    CLIENT_DOWNLOAD_START = 9;
    CLIENT_DOWNLOAD_STOP = 10;
    CLIENT_DOWNLOAD_DELETE = 11;
    CLIENT_DOWNLOAD_EXECUTE_ACTION = 12;
    CLIENT_DOWNLOAD_INFO_REQUEST = 13;
}

message client_msg {
	required CLIENT_MSG_TYPE type = 1;
	optional string auth_token = 2; //this must be set in all message type's except CLIENT_AUTH_REQUEST
	optional client_auth_request auth_request = 3;
	repeated client_download_ui_data_request download_ui_data_request = 4;
	repeated client_event_subscription_request subscription_request = 5;
	repeated client_event_unsubscription_request unsubscription_request = 6;
	repeated client_download_request downloads_request = 7;
	optional client_download_add_request download_add_request = 8;
	optional client_download_start_request download_start_request = 9;
	optional client_download_stop_request download_stop_request = 10;
	optional client_download_delete_request download_delete_request = 11;
	optional client_download_action_request download_action_request = 12;
	optional client_downloads_request download_list_request = 13;
}



enum SERVER_MSG_TYPE {
	SERVER_AUTH_REPLY = 0;
	SERVER_UI_DATA_REPLY = 1;
	SERVER_MODULES_REPLY = 2;
	SERVER_CORE_INFO_REPLY = 3;
	SERVER_SUBSCRIPTIONS_REPLY = 4;
	SERVER_UNSUBSCRIPTIONS_REPLY = 5;
	SERVER_DOWNLOADS_LIST_REPLY = 6;
	SERVER_DOWNLOAD_INFO_REPLY = 7;
}



message server_msg {
	required SERVER_MSG_TYPE type = 1;
	optional server_download_ui_data_reply download_ui_data_reply = 2;
	optional server_auth_reply auth_reply = 3;
	repeated module_info server_modules_reply = 4;
	optional core_info server_core_info_reply = 5;
	repeated server_event_subscription_reply subscription_reply = 6;
	repeated server_event_unsubscription_reply unsubscription_reply = 7;
	optional server_download_reply download = 8;
	repeated server_download_reply downloads = 9;
}

//top level messages end