import { log } from '@bixi/core/utils';
import { NzSafeAny } from 'ng-zorro-antd/core/types';
import tinycolor from 'tinycolor2';
import { IColorMode } from './color-picker.type';

const COLOR_FUN_MAP: NzSafeAny = {
  'hex': 'toHexString',
  'rgb': 'toRgb',
  'rgbString': 'toRgbString',
  'hsl': 'toHsl',
  'hslString': 'toHslString',
  'hsv': 'toHsv',
  'hsvString': 'toHsvString'
};

export function convertColor(color: NzSafeAny) {
  const colorInstance = tinycolor(color);
  const hsl = colorInstance.toHsl();
  const hsv = colorInstance.toHsv();
  const rgb = colorInstance.toRgb();
  const hex = colorInstance.toHex();
  const transparent = hex === '000000' && rgb.a === 0;
  return {
    hsl,
    hex: transparent ? 'transparent' : `#${hex}`,
    rgb,
    hsv
  };
}

export function mapColor(color: NzSafeAny, target: IColorMode) {
  const colorInstance = tinycolor(color) as NzSafeAny;
  if (!COLOR_FUN_MAP[target]) {
    log('color-picker', `mode '${target}' not defined`);
    return colorInstance.toHexString();
  }
  return colorInstance[COLOR_FUN_MAP[target]]();
}

const checkboardCache: { [key: string]: string } = {};

function render(c1: string, c2: string, size: number) {
  if (typeof document === 'undefined') {
    return null;
  }
  const canvas = document.createElement('canvas');
  canvas.width = size * 2;
  canvas.height = size * 2;
  const ctx = canvas.getContext('2d');
  if (!ctx) {
    return null;
  }
  ctx.fillStyle = c1;
  ctx.fillRect(0, 0, canvas.width, canvas.height);
  ctx.fillStyle = c2;
  ctx.fillRect(0, 0, size, size);
  ctx.translate(size, size);
  ctx.fillRect(0, 0, size, size);
  return canvas.toDataURL();
}

export function getCheckboard(c1: string, c2: string, size: number) {
  const key = `${c1}-${c2}-${size}`;
  if (checkboardCache[key]) {
    return checkboardCache[key];
  }
  const checkboard = render(c1, c2, size);
  if (!checkboard) {
    return null;
  }
  checkboardCache[key] = checkboard;
  return checkboard;
}