// Copyright (C) 2026 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import type {Trace} from '../../public/trace';
import {type ArrowConnection, ArrowVisualiser} from './arrow_visualiser';
import type {Overlay, TrackBounds} from '../../public/track';
import type {TimeScale} from '../../base/time_scale';
import type {Size2D} from '../../base/geom';

export class RelatedEventsOverlay implements Overlay {
  private readonly visualiser: ArrowVisualiser;

  constructor(
    trace: Trace,
    private readonly getConnections: () => ArrowConnection[],
  ) {
    this.visualiser = new ArrowVisualiser(trace);
  }

  render(
    ctx: CanvasRenderingContext2D,
    ts: TimeScale,
    _size: Size2D,
    tracks: ReadonlyArray<TrackBounds>,
  ): void {
    const connections = this.getConnections();
    if (connections.length > 0) {
      this.visualiser.draw(ctx, ts, tracks, connections);
    }
  }
}
