Partially render the boxes

[rbdr/canvas] / src / lib / stores / widgets.js

import { derived, writable } from 'svelte/store';
import { createClient } from '@supabase/supabase-js';
import { supabase } from '$lib/config';
import { maxSize } from '$lib/config';

const boxParser = /\(([0-9]+),([0-9]+)\),\(([0-9]+),([0-9]+)\)/
const client = createClient(supabase.url, supabase.key);

export const sensor = writable({left: 0, top: 0, right: 0, bottom: 0});

const getBoxes = function getBoxes ({left, top, right, bottom}) {
  const results = [
    `box.ov."((${left},${top}),(${right},${bottom}))"`,
    `box.ov."((${left+maxSize},${top+maxSize}),(${right+maxSize},${bottom+maxSize}))"`,
    `box.ov."((${left+maxSize},${top}),(${right+maxSize},${bottom}))"`,
    `box.ov."((${left},${top+maxSize}),(${right},${bottom+maxSize}))"`
  ];

  if (right > maxSize  || bottom > maxSize) {
    return [...results,
      `box.ov."((${left-maxSize},${top-maxSize}),(${right-maxSize},${bottom-maxSize}))"`,
      `box.ov."((${left-maxSize},${top}),(${right-maxSize},${bottom}))"`,
      `box.ov."((${left},${top-maxSize}),(${right},${bottom-maxSize}))"`
    ];
  }

  return results
};

const serialize = function serialize(widget) {

  const boxComponents = widget.box
    .match(boxParser)
    .slice(1,5)
    .map(Number);
  const box = {
    left: Math.min(boxComponents[0], boxComponents[2]),
    right: Math.max(boxComponents[0], boxComponents[2]),
    top: Math.min(boxComponents[1], boxComponents[3]),
    bottom: Math.max(boxComponents[1], boxComponents[3])
  };

  return {...widget, box }
};

let ac = null;
export const widgets = derived(sensor, async function ($sensor, set) {

  const boxes = getBoxes($sensor);
  ac && ac.abort()
  ac = new AbortController();
  const { data } = await client
    .from('widgets')
    .select()
    .or(boxes.join(','))
    .abortSignal(ac.signal)
  if (data) {
    return set(data.map(serialize));
  }
});