import * as React from 'react';
import { Shimmer, ShimmerElementsGroup, ShimmerElementType } from 'office-ui-fabric-react/lib/Shimmer';
import { Fabric } from 'office-ui-fabric-react/lib/Fabric';
import { mergeStyles } from 'office-ui-fabric-react/lib/Styling';

const wrapperClass = mergeStyles({
  padding: 2,
  selectors: {
    '& > .ms-Shimmer-container': {
      margin: '10px 0',
    },
  },
});
const wrapperStyle = { display: 'flex' };
const getCustomElementsExampleOne = (): JSX.Element => {
  return (
    <div style={wrapperStyle}>
      <ShimmerElementsGroup
        shimmerElements={[
          { type: ShimmerElementType.line, width: 40, height: 40 },
          { type: ShimmerElementType.gap, width: 10, height: 40 },
        ]}
      />
      <ShimmerElementsGroup
        flexWrap
        shimmerElements={[
          { type: ShimmerElementType.line, width: 300, height: 10 },
          { type: ShimmerElementType.line, width: 200, height: 10 },
          { type: ShimmerElementType.gap, width: 100, height: 20 },
        ]}
      />
    </div>
  );
};

const getCustomElementsExampleTwo = (): JSX.Element => {
  return (
    <div style={wrapperStyle}>
      <ShimmerElementsGroup
        shimmerElements={[
          { type: ShimmerElementType.circle, height: 40 },
          { type: ShimmerElementType.gap, width: 10, height: 40 },
        ]}
      />
      <ShimmerElementsGroup
        flexWrap
        shimmerElements={[
          { type: ShimmerElementType.line, width: 400, height: 10 },
          { type: ShimmerElementType.gap, width: 100, height: 20 },
          { type: ShimmerElementType.line, width: 500, height: 10 },
        ]}
      />
    </div>
  );
};

const getCustomElementsExampleThree = (): JSX.Element => {
  return (
    <div style={wrapperStyle}>
      <ShimmerElementsGroup
        width={'90px'}
        shimmerElements={[
          { type: ShimmerElementType.line, height: 80, width: 80 },
          { type: ShimmerElementType.gap, width: 10, height: 80 },
        ]}
      />
      <div style={{ display: 'flex', flexWrap: 'wrap', width: '100%' }}>
        <ShimmerElementsGroup
          shimmerElements={[
            { type: ShimmerElementType.circle, height: 40 },
            { type: ShimmerElementType.gap, width: 10, height: 40 },
          ]}
        />
        <ShimmerElementsGroup
          flexWrap
          width={'calc(100% - 50px)'}
          shimmerElements={[
            { type: ShimmerElementType.line, width: '90%', height: 10 },
            { type: ShimmerElementType.gap, width: '10%', height: 20 },
            { type: ShimmerElementType.line, width: '100%', height: 10 },
          ]}
        />
        <ShimmerElementsGroup
          flexWrap
          width={'100%'}
          shimmerElements={[
            { type: ShimmerElementType.line, width: '80%', height: 10, verticalAlign: 'bottom' },
            { type: ShimmerElementType.gap, width: '20%', height: 20 },
            { type: ShimmerElementType.line, width: '40%', height: 10, verticalAlign: 'bottom' },
            { type: ShimmerElementType.gap, width: '2%', height: 20 },
            { type: ShimmerElementType.line, width: '58%', height: 10, verticalAlign: 'bottom' },
          ]}
        />
      </div>
    </div>
  );
};

export const ShimmerCustomElementsExample: React.FunctionComponent = () => (
  <Fabric className={wrapperClass}>
    Using ShimmerElementsGroup component to build complex structures of the placeholder you need.
    <Shimmer customElementsGroup={getCustomElementsExampleOne()} width="350" />
    <Shimmer customElementsGroup={getCustomElementsExampleTwo()} width="550" />
    <Shimmer customElementsGroup={getCustomElementsExampleThree()} width="90%" />
  </Fabric>
);