syntax = "proto3";

package yaze.proto;

// ============================================================================
// Canvas Automation Service
// ============================================================================
// Provides remote control of canvas operations for:
// - AI agents via tool calls
// - ImGuiTestHarness automation
// - Remote GUI testing and validation
// - Batch scripting workflows
// - Coordinate conversion independent of zoom/scroll
//
// All operations use logical tile coordinates, not pixel coordinates.
// This ensures commands work consistently regardless of UI zoom level.

service CanvasAutomation {
  // Tile Operations
  rpc SetTile(SetTileRequest) returns (SetTileResponse);
  rpc GetTile(GetTileRequest) returns (GetTileResponse);
  rpc SetTiles(SetTilesRequest) returns (SetTilesResponse);
  
  // Selection Operations
  rpc SelectTile(SelectTileRequest) returns (SelectTileResponse);
  rpc SelectTileRect(SelectTileRectRequest) returns (SelectTileRectResponse);
  rpc GetSelection(GetSelectionRequest) returns (GetSelectionResponse);
  rpc ClearSelection(ClearSelectionRequest) returns (ClearSelectionResponse);
  
  // View Operations
  rpc ScrollToTile(ScrollToTileRequest) returns (ScrollToTileResponse);
  rpc CenterOn(CenterOnRequest) returns (CenterOnResponse);
  rpc SetZoom(SetZoomRequest) returns (SetZoomResponse);
  rpc GetZoom(GetZoomRequest) returns (GetZoomResponse);
  
  // Query Operations
  rpc GetDimensions(GetDimensionsRequest) returns (GetDimensionsResponse);
  rpc GetVisibleRegion(GetVisibleRegionRequest) returns (GetVisibleRegionResponse);
  rpc IsTileVisible(IsTileVisibleRequest) returns (IsTileVisibleResponse);
}

// ============================================================================
// Common Types
// ============================================================================

message TileCoord {
  int32 x = 1;
  int32 y = 2;
}

message TileData {
  int32 x = 1;
  int32 y = 2;
  int32 tile_id = 3;
}

message Rect {
  int32 x1 = 1;
  int32 y1 = 2;
  int32 x2 = 3;
  int32 y2 = 4;
}

message Dimensions {
  int32 width_tiles = 1;
  int32 height_tiles = 2;
  int32 tile_size = 3;
}

message VisibleRegion {
  int32 min_x = 1;
  int32 min_y = 2;
  int32 max_x = 3;
  int32 max_y = 4;
}

// ============================================================================
// Tile Operations
// ============================================================================

message SetTileRequest {
  string canvas_id = 1;
  int32 x = 2;
  int32 y = 3;
  int32 tile_id = 4;
}

message SetTileResponse {
  bool success = 1;
  string error = 2;
}

message GetTileRequest {
  string canvas_id = 1;
  int32 x = 2;
  int32 y = 3;
}

message GetTileResponse {
  int32 tile_id = 1;
  bool success = 2;
  string error = 3;
}

message SetTilesRequest {
  string canvas_id = 1;
  repeated TileData tiles = 2;
}

message SetTilesResponse {
  bool success = 1;
  int32 tiles_painted = 2;
  string error = 3;
}

// ============================================================================
// Selection Operations
// ============================================================================

message SelectTileRequest {
  string canvas_id = 1;
  int32 x = 2;
  int32 y = 3;
}

message SelectTileResponse {
  bool success = 1;
  string error = 2;
}

message SelectTileRectRequest {
  string canvas_id = 1;
  Rect rect = 2;
}

message SelectTileRectResponse {
  bool success = 1;
  int32 tiles_selected = 2;
  string error = 3;
}

message GetSelectionRequest {
  string canvas_id = 1;
}

message GetSelectionResponse {
  bool has_selection = 1;
  repeated TileCoord selected_tiles = 2;
  TileCoord selection_start = 3;
  TileCoord selection_end = 4;
}

message ClearSelectionRequest {
  string canvas_id = 1;
}

message ClearSelectionResponse {
  bool success = 1;
}

// ============================================================================
// View Operations
// ============================================================================

message ScrollToTileRequest {
  string canvas_id = 1;
  int32 x = 2;
  int32 y = 3;
  bool center = 4;
}

message ScrollToTileResponse {
  bool success = 1;
  string error = 2;
}

message CenterOnRequest {
  string canvas_id = 1;
  int32 x = 2;
  int32 y = 3;
}

message CenterOnResponse {
  bool success = 1;
  string error = 2;
}

message SetZoomRequest {
  string canvas_id = 1;
  float zoom = 2;
}

message SetZoomResponse {
  bool success = 1;
  float actual_zoom = 2;  // May be clamped
  string error = 3;
}

message GetZoomRequest {
  string canvas_id = 1;
}

message GetZoomResponse {
  float zoom = 1;
}

// ============================================================================
// Query Operations
// ============================================================================

message GetDimensionsRequest {
  string canvas_id = 1;
}

message GetDimensionsResponse {
  Dimensions dimensions = 1;
}

message GetVisibleRegionRequest {
  string canvas_id = 1;
}

message GetVisibleRegionResponse {
  VisibleRegion region = 1;
}

message IsTileVisibleRequest {
  string canvas_id = 1;
  int32 x = 2;
  int32 y = 3;
}

message IsTileVisibleResponse {
  bool is_visible = 1;
}