syntax = "proto3";

package chatto.api.v1;

import "buf/validate/validate.proto";

// Fit mode used when generating transformed image URLs.
enum ImageFitMode {
  // The fit mode was not specified.
  IMAGE_FIT_MODE_UNSPECIFIED = 0;
  // Preserve the whole source image within the requested bounds.
  IMAGE_FIT_MODE_CONTAIN = 1;
  // Fill the requested bounds, cropping when needed.
  IMAGE_FIT_MODE_COVER = 2;
}

// Policy governing thread creation and reply placement in a channel room.
// Direct-message rooms do not support threads and use UNSPECIFIED.
enum RoomThreadingMode {
  // No mode was supplied. CreateRoom treats this as ENABLED so older stored
  // rooms and omitted request fields preserve Chatto's default behavior.
  ROOM_THREADING_MODE_UNSPECIFIED = 0;
  // Every new root message establishes a thread, and replies to root messages
  // must be posted in that root's thread.
  ROOM_THREADING_MODE_REQUIRED = 1;
  // Clients should steer replies into threads, but the server accepts both
  // threaded and ordinary in-room replies.
  ROOM_THREADING_MODE_ENCOURAGED = 2;
  // Threads are available and clients may freely choose whether to use them.
  ROOM_THREADING_MODE_ENABLED = 3;
  // New threads, thread replies, and channel echoes are rejected. Existing
  // threads and echoes remain readable and ordinary in-room reply attribution
  // remains available.
  ROOM_THREADING_MODE_DISABLED = 4;
}

// Image transform parameters for generated image URLs.
message ImageTransformOptions {
  // Target image width in pixels.
  int32 width = 1 [(buf.validate.field).int32 = {
    gte: 1
    lte: 4096
  }];
  // Target image height in pixels.
  int32 height = 2 [(buf.validate.field).int32 = {
    gte: 1
    lte: 4096
  }];
  // Image crop/fit behavior.
  ImageFitMode fit = 3 [(buf.validate.field).enum.defined_only = true];
}

// Browser-supplied image upload payload.
message ImageUpload {
  // Raw image bytes.
  bytes image = 1;
  // Original browser filename, for diagnostics and future compatibility.
  string filename = 2;
  // Browser-provided content type, for diagnostics and future compatibility.
  string content_type = 3;
}

// Public login/provider metadata shared by discovery and account-linking APIs.
message ProviderMetadata {
  // Stable configured provider ID.
  string id = 1;
  // Provider type, such as "password", "oidc", "github", or "discord".
  string type = 2;
  // Human-readable provider label.
  string label = 3;
  // URL that starts login for this provider.
  string login_url = 4;
  // OIDC issuer URL. Absent for providers that do not use OpenID Connect.
  // Clients can compare this value with their own trusted issuer selection;
  // the server does not select the client's identity provider.
  optional string issuer_url = 5;
  // Whether an unlinked identity may create a new account through this provider.
  optional bool auto_provision = 6;
}