syntax = "proto3";

package appks.im.v1;

import "google/protobuf/timestamp.proto";

// Channel management service for the IM microservice.
// Provides CRUD for channels and categories, plus channel statistics.

// ── Enums ──────────────────────────────────────────────────────────────

enum ChannelType {
  CHANNEL_TYPE_UNSPECIFIED = 0;
  CHANNEL_TYPE_PUBLIC = 1;
  CHANNEL_TYPE_PRIVATE = 2;
  CHANNEL_TYPE_DIRECT = 3;
  CHANNEL_TYPE_GROUP = 4;
  CHANNEL_TYPE_REPO = 5;
  CHANNEL_TYPE_SYSTEM = 6;
}

enum ChannelKind {
  CHANNEL_KIND_UNSPECIFIED = 0;
  CHANNEL_KIND_TEXT = 1;
  CHANNEL_KIND_VOICE = 2;
  CHANNEL_KIND_STAGE = 3;
  CHANNEL_KIND_FORUM = 4;
  CHANNEL_KIND_ANNOUNCEMENT = 5;
}

enum Visibility {
  VISIBILITY_UNSPECIFIED = 0;
  VISIBILITY_PUBLIC = 1;
  VISIBILITY_PRIVATE = 2;
  VISIBILITY_INTERNAL = 3;
  VISIBILITY_WORKSPACE = 4;
  VISIBILITY_PROTECTED = 5;
  VISIBILITY_HIDDEN = 6;
  VISIBILITY_SECRET = 7;
}

// ── Messages ───────────────────────────────────────────────────────────

message Channel {
  string id = 1;
  string workspace_id = 2;
  optional string category_id = 3;
  optional string parent_channel_id = 4;
  string name = 5;
  optional string topic = 6;
  optional string description = 7;
  ChannelType channel_type = 8;
  ChannelKind channel_kind = 9;
  Visibility visibility = 10;
  int32 position = 11;
  bool nsfw = 12;
  bool read_only = 13;
  bool archived = 14;
  optional string created_by = 15;
  optional int32 rate_limit_per_user = 16;
  optional google.protobuf.Timestamp archived_at = 17;
  optional string last_message_id = 18;
  optional google.protobuf.Timestamp last_message_at = 19;
  google.protobuf.Timestamp created_at = 20;
  google.protobuf.Timestamp updated_at = 21;
}

message ChannelStats {
  string channel_id = 1;
  int32 members_count = 2;
  int32 messages_count = 3;
  int32 threads_count = 4;
  int32 reactions_count = 5;
  int32 mentions_count = 6;
  int32 files_count = 7;
  optional google.protobuf.Timestamp last_activity_at = 8;
  google.protobuf.Timestamp updated_at = 9;
}

message ChannelCategory {
  string id = 1;
  string workspace_id = 2;
  string name = 3;
  int32 position = 4;
  bool collapsed = 5;
  google.protobuf.Timestamp created_at = 6;
  google.protobuf.Timestamp updated_at = 7;
}

// ── Requests / Responses ──────────────────────────────────────────────

message GetChannelRequest {
  string channel_id = 1;
}

message GetChannelResponse {
  Channel channel = 1;
}

message ListChannelsRequest {
  string workspace_name = 1;
  optional string category_id = 2;
  optional ChannelType channel_type = 3;
  optional ChannelKind channel_kind = 4;
  int32 limit = 5;
  int32 offset = 6;
}

message ListChannelsResponse {
  repeated Channel channels = 1;
  int32 total = 2;
}

message CreateChannelRequest {
  string workspace_name = 1;
  string name = 2;
  optional string topic = 3;
  optional string description = 4;
  optional string channel_type = 5;
  optional string channel_kind = 6;
  optional string visibility = 7;
  optional string category_id = 8;
  optional string parent_channel_id = 9;
  optional string created_by = 10;
  optional int32 rate_limit_per_user = 11;
}

message CreateChannelResponse {
  Channel channel = 1;
}

message UpdateChannelRequest {
  string channel_id = 1;
  optional string name = 2;
  optional string topic = 3;
  optional string description = 4;
  optional string visibility = 5;
  optional int32 position = 6;
  optional bool nsfw = 7;
  optional bool read_only = 8;
  optional bool archived = 9;
  optional string category_id = 10;
  optional int32 rate_limit_per_user = 11;
}

message UpdateChannelResponse {
  Channel channel = 1;
}

message DeleteChannelRequest {
  string channel_id = 1;
}

message DeleteChannelResponse {}

message GetChannelStatsRequest {
  string channel_id = 1;
}

message GetChannelStatsResponse {
  ChannelStats stats = 1;
}

message ListCategoriesRequest {
  string workspace_name = 1;
}

message ListCategoriesResponse {
  repeated ChannelCategory categories = 1;
}

message CreateCategoryRequest {
  string workspace_name = 1;
  string name = 2;
  optional int32 position = 3;
}

message CreateCategoryResponse {
  ChannelCategory category = 1;
}

message UpdateCategoryRequest {
  string category_id = 1;
  optional string name = 2;
  optional int32 position = 3;
  optional bool collapsed = 4;
}

message UpdateCategoryResponse {
  ChannelCategory category = 1;
}

message DeleteCategoryRequest {
  string category_id = 1;
}

message DeleteCategoryResponse {}

// ── Service ───────────────────────────────────────────────────────────

service ChannelService {
  rpc GetChannel(GetChannelRequest) returns (GetChannelResponse);
  rpc ListChannels(ListChannelsRequest) returns (ListChannelsResponse);
  rpc CreateChannel(CreateChannelRequest) returns (CreateChannelResponse);
  rpc UpdateChannel(UpdateChannelRequest) returns (UpdateChannelResponse);
  rpc DeleteChannel(DeleteChannelRequest) returns (DeleteChannelResponse);
  rpc GetChannelStats(GetChannelStatsRequest) returns (GetChannelStatsResponse);
  rpc ListCategories(ListCategoriesRequest) returns (ListCategoriesResponse);
  rpc CreateCategory(CreateCategoryRequest) returns (CreateCategoryResponse);
  rpc UpdateCategory(UpdateCategoryRequest) returns (UpdateCategoryResponse);
  rpc DeleteCategory(DeleteCategoryRequest) returns (DeleteCategoryResponse);
}