import { Pattern, silence, register, pure, createParams } from '@strudel/core';

import { getDrawContext } from './draw.mjs';

let clearColor = '#22222210';

Pattern.prototype.animate = function ({ callback, sync = false, smear = 0.5 } = {}) {

  window.frame && cancelAnimationFrame(window.frame);

  const ctx = getDrawContext();

  let { clientWidth: ww, clientHeight: wh } = ctx.canvas;

  ww *= window.devicePixelRatio;

  wh *= window.devicePixelRatio;

  let smearPart = smear === 0 ? '99' : Number((1 - smear) * 100).toFixed(0);

  smearPart = smearPart.length === 1 ? `0${smearPart}` : smearPart;

  clearColor = `#200010${smearPart}`;

  const render = (t) => {

    let frame;

    /*     if (sync) {

      t = scheduler.now();

      frame = this.queryArc(t, t);

    } else { */

    t = Math.round(t);

    frame = this.slow(1000).queryArc(t, t);

    // }

    ctx.fillStyle = clearColor;

    ctx.fillRect(0, 0, ww, wh);

    frame.forEach((f) => {

      let { x, y, w, h, s, r, angle = 0, fill = 'darkseagreen' } = f.value;

      w *= ww;

      h *= wh;

      if (r !== undefined && angle !== undefined) {

        const radians = angle * 2 * Math.PI;

        const [cx, cy] = [(ww - w) / 2, (wh - h) / 2];

        x = cx + Math.cos(radians) * r * cx;

        y = cy + Math.sin(radians) * r * cy;

      } else {

        x *= ww - w;

        y *= wh - h;

      }

      const val = { ...f.value, x, y, w, h };

      ctx.fillStyle = fill;

      if (s === 'rect') {

        ctx.fillRect(x, y, w, h);

      } else if (s === 'ellipse') {

        ctx.beginPath();

        ctx.ellipse(x + w / 2, y + h / 2, w / 2, h / 2, 0, 0, 2 * Math.PI);

        ctx.fill();

      }

      callback && callback(ctx, val, f);

    });

    window.frame = requestAnimationFrame(render);

  };

  window.frame = requestAnimationFrame(render);

  return silence;

};

export const { x, y, w, h, angle, r, fill, smear } = createParams('x', 'y', 'w', 'h', 'angle', 'r', 'fill', 'smear');

export const rescale = register('rescale', function (f, pat) {

  return pat.mul(x(f).w(f).y(f).h(f));

});

export const moveXY = register('moveXY', function (dx, dy, pat) {

  return pat.add(x(dx).y(dy));

});

export const zoomIn = register('zoomIn', function (f, pat) {

  const d = pure(1).sub(f).div(2);

  return pat.rescale(f).move(d, d);

});