import * as React from "react";
import { FunctionComponent } from "react";
import { PitHighlight } from "@mancala/core";
import Stones from "./Stones";

export type PitMarks = {
  highlight?: PitHighlight;
  // Stones a hovered move would drop here.
  preview?: number;
  // The hovered move's last stone lands here, or the shown move's did.
  land?: boolean;
  // The last move was played from here.
  last?: boolean;
};

export function getMarkClasses(marks: PitMarks): string {
  const highlight = marks.highlight === "capture" ? " cap" : marks.highlight === "selected" ? " sel"
    : marks.highlight ? " drop" : "";
  return highlight + (marks.preview ? " pv" : "") + (marks.land ? " land" : "") + (marks.last ? " last" : "");
}

// A pit in the top or bottom row. Position is its column from the left, 0-5. The viewer's pits are buttons.
const PitView: FunctionComponent<{
  index: number;
  stoneCount: number;
  top: boolean;
  position: number;
  themeId: string;
  label: string;
  marks: PitMarks;
  // The viewer can play this pit now.
  playable?: boolean;
  // Set for pits the viewer can click.
  onClick?: () => void;
  // Called with true when a playable pit is hovered or focused, with false when that ends.
  onPreview?: (active: boolean) => void;
}> = ({ index, stoneCount, top, position, themeId, label, marks, playable, onClick, onPreview }) => {
  const className = "pit" + (playable ? " mine" : "") + getMarkClasses(marks);
  const style = {
    "--hr": top ? "1" : "2",
    "--hc": String(position + 2),
    "--vr": String(position + 2),
    "--vc": top ? "2" : "1",
  } as React.CSSProperties;
  const content = (
    <>
      <Stones count={stoneCount} seed={index * 5.3 + 1} themeId={themeId} />
      <span className={top ? "badge t" : "badge b"}>{stoneCount}</span>
      {!!marks.preview && <span className="pvchip">{`+${marks.preview}`}</span>}
    </>
  );
  if (!onClick) {
    return <div className={className} style={style} role="img" aria-label={label}>{content}</div>;
  }
  return (
    <button
      className={className}
      style={style}
      aria-label={label}
      aria-disabled={!playable}
      onClick={onClick}
      onMouseEnter={() => playable && onPreview?.(true)}
      onMouseLeave={() => onPreview?.(false)}
      onFocus={() => playable && onPreview?.(true)}
      onBlur={() => onPreview?.(false)}>
      {content}
    </button>
  );
};

export default PitView;