import { Tool } from '../tool.js';
import { 
  ZOOM_IN_FACTOR,
  ZOOM_OUT_FACTOR,
} from '../config.js';

export class Zoom extends Tool {
  constructor(toolbar) {
    super(toolbar);

    const zoomOut = document.createElement('button');
    const zoomIn = document.createElement('button');
    const zoomAll = document.createElement('button');

    this.div.appendChild(zoomOut);
    this.div.appendChild(zoomIn);
    this.div.appendChild(document.createElement('br'));
    this.div.appendChild(zoomAll);
    this.div.appendChild(document.createElement('br'));

    zoomAll.classList.add('wide');

    zoomOut.innerHTML = '<h2>Zoom<br>Out</h2>';
    zoomIn.innerHTML = '<h2>Zoom<br>In</h2>';
    zoomAll.innerHTML = '<h2>Zoom to Fit</h2>';

    zoomOut.addEventListener('click', () => {
      // Aim at center of view
      const x = this.sim.display.width * this.sim.display.scale / 2;
      const y = this.sim.display.height * this.sim.display.scale / 2;
      this.sim.scheduleZoom(this.sim.screenToSim(x, y), ZOOM_OUT_FACTOR);
    });

    zoomIn.addEventListener('click', () => {
      // Aim at center of view
      const x = this.sim.display.width * this.sim.display.scale / 2;
      const y = this.sim.display.height * this.sim.display.scale / 2;
      this.sim.scheduleZoom(this.sim.screenToSim(x, y), ZOOM_IN_FACTOR);
    });

    zoomAll.addEventListener('click', () => {
      // Determine bounding box
      const box = this.sim.objects.boundingBox;
      const x = (box.start.x + box.end.x) / 2;
      const y = (box.start.y + box.end.y) / 2;
      if (box.start.x !== box.end.x && box.start.y !== box.end.y) {
        const widthRatio = Math.abs(box.start.x - box.end.x) / this.sim.display.width;
        const heightRatio = Math.abs(box.start.y - box.end.y) / this.sim.display.height;
        const biggerRatio = Math.max(widthRatio, heightRatio);
        const base2factor = Math.log(1/biggerRatio) / Math.log(2);
        const factor = Math.floor(base2factor) - 1;
        console.log({biggerRatio, base2factor, factor});
        this.sim.scheduleZoom({x, y}, factor);
      }
    });
  }
}