// import khroma from 'khroma';
import * as khroma from 'khroma';

/** Returns the styles given options */
export interface FlowChartStyleOptions {
  arrowheadColor: string;
  border2: string;
  clusterBkg: string;
  clusterBorder: string;
  edgeLabelBackground: string;
  fontFamily: string;
  lineColor: string;
  mainBkg: string;
  nodeBorder: string;
  nodeTextColor: string;
  tertiaryColor: string;
  textColor: string;
  titleColor: string;
}

const fade = (color: string, opacity: number) => {
  // @ts-ignore TODO: incorrect types from khroma
  const channel = khroma.channel;

  const r = channel(color, 'r');
  const g = channel(color, 'g');
  const b = channel(color, 'b');

  // @ts-ignore incorrect types from khroma
  return khroma.rgba(r, g, b, opacity);
};

const getStyles = (options: FlowChartStyleOptions) =>
  `.label {
    font-family: ${options.fontFamily};
    color: ${options.nodeTextColor || options.textColor};
  }
  .cluster-label text {
    fill: ${options.titleColor};
  }
  .cluster-label span {
    color: ${options.titleColor};
  }
  .cluster-label span p {
    background-color: transparent;
  }

  .label text,span {
    fill: ${options.nodeTextColor || options.textColor};
    color: ${options.nodeTextColor || options.textColor};
  }

  .node rect,
  .node circle,
  .node ellipse,
  .node polygon,
  .node path {
    fill: ${options.mainBkg};
    stroke: ${options.nodeBorder};
    stroke-width: 1px;
  }
  .node .label text {
    text-anchor: middle;
  }
  // .flowchart-label .text-outer-tspan {
  //   text-anchor: middle;
  // }
  // .flowchart-label .text-inner-tspan {
  //   text-anchor: start;
  // }

  .node .katex path {
    fill: #000;
    stroke: #000;
    stroke-width: 1px;
  }

  .node .label {
    text-align: center;
  }
  .node.clickable {
    cursor: pointer;
  }

  .arrowheadPath {
    fill: ${options.arrowheadColor};
  }

  .edgePath .path {
    stroke: ${options.lineColor};
    stroke-width: 2.0px;
  }

  .flowchart-link {
    stroke: ${options.lineColor};
    fill: none;
  }

  .edgeLabel {
    background-color: ${options.edgeLabelBackground};
    p {
      background-color: ${options.edgeLabelBackground};
    }
    rect {
      opacity: 0.5;
      background-color: ${options.edgeLabelBackground};
      fill: ${options.edgeLabelBackground};
    }
    text-align: center;
  }

  /* For html labels only */
  .labelBkg {
    background-color: ${fade(options.edgeLabelBackground, 0.5)};
    // background-color:
  }

  .cluster rect {
    fill: ${options.clusterBkg};
    stroke: ${options.clusterBorder};
    stroke-width: 1px;
  }

  .cluster text {
    fill: ${options.titleColor};
  }

  .cluster span {
    color: ${options.titleColor};
  }
  /* .cluster div {
    color: ${options.titleColor};
  } */

  div.mermaidTooltip {
    position: absolute;
    text-align: center;
    max-width: 200px;
    padding: 2px;
    font-family: ${options.fontFamily};
    font-size: 12px;
    background: ${options.tertiaryColor};
    border: 1px solid ${options.border2};
    border-radius: 2px;
    pointer-events: none;
    z-index: 100;
  }

  .flowchartTitleText {
    text-anchor: middle;
    font-size: 18px;
    fill: ${options.textColor};
  }
`;

export default getStyles;
