import { mix } from '../util/common';
import MatrixUtil from '../graphic/util/matrix';
import Vector2 from '../graphic/util/vector2';
var defaultMatrix = [1, 0, 0, 1, 0, 0];

class Base {
  _initDefaultCfg() {}

  constructor(cfg) {
    this._initDefaultCfg();

    mix(this, cfg);
    var start;
    var end;

    if (this.plot) {
      start = this.plot.bl;
      end = this.plot.tr;
      this.start = start;
      this.end = end;
    } else {
      start = this.start;
      end = this.end;
    }

    this.init(start, end);
  }

  _scale(s1, s2) {
    var matrix = this.matrix;
    var center = this.center;
    MatrixUtil.translate(matrix, matrix, [center.x, center.y]);
    MatrixUtil.scale(matrix, matrix, [s1, s2]);
    MatrixUtil.translate(matrix, matrix, [-center.x, -center.y]);
  }

  init(start, end) {
    this.matrix = [].concat(defaultMatrix); // 设置中心点

    this.center = {
      x: (end.x - start.x) / 2 + start.x,
      y: (end.y - start.y) / 2 + start.y
    };

    if (this.scale) {
      this._scale(this.scale[0], this.scale[1]);
    }
  }

  convertPoint(point) {
    var {
      x,
      y
    } = this._convertPoint(point);

    if (!MatrixUtil.isChanged(this.matrix)) {
      return {
        x,
        y
      };
    }

    var vector = [x, y];
    Vector2.transformMat2d(vector, vector, this.matrix);
    return {
      x: vector[0],
      y: vector[1]
    };
  }

  invertPoint(point) {
    return this._invertPoint(point);
  }

  _convertPoint(point) {
    return point;
  }

  _invertPoint(point) {
    return point;
  }

  reset(plot) {
    this.plot = plot;
    var {
      bl,
      tr
    } = plot;
    this.start = bl;
    this.end = tr;
    this.init(bl, tr);
  }

}

export default Base;