import { Fragment } from 'react';
import type { FlooringPiece, SkirtingPiece } from '../lib/types';
import { cutMm, degree } from '../lib/format';
import {
  dimensionedOutline,
  flooringTemplate,
  fullPreviewBox,
  skirtingEndBoxes,
  skirtingTemplate,
  viewBox,
} from '../lib/cut-preview';
import type { EdgeDimension } from '../lib/cut-preview';

function Dimensions({ dimensions, font }: { dimensions: EdgeDimension[]; font: number }) {
  return (
    <g className="cut-dimensions">
      {dimensions.map((dimension) => {
        const { start, end, lineStart, lineEnd, normal, label } = dimension;
        const center = { x: (lineStart.x + lineEnd.x) / 2, y: (lineStart.y + lineEnd.y) / 2 };
        const staggered =
          Math.abs((label.x - center.x) * -normal.y + (label.y - center.y) * normal.x) > font * 0.1;
        return (
          <g
            key={dimension.edge}
            className="dimension-lines"
            stroke="#637185"
            strokeWidth="0.8"
            fill="none"
          >
            {[
              [start, lineStart],
              [end, lineEnd],
            ].map(([point, projected], i) => (
              <line
                key={i}
                className="dimension-extension"
                x1={point.x + normal.x * font * 0.12}
                y1={point.y + normal.y * font * 0.12}
                x2={projected.x + normal.x * font * 0.12}
                y2={projected.y + normal.y * font * 0.12}
                vectorEffect="non-scaling-stroke"
              />
            ))}
            <line
              className="dimension-line"
              x1={lineStart.x}
              y1={lineStart.y}
              x2={lineEnd.x}
              y2={lineEnd.y}
              vectorEffect="non-scaling-stroke"
            />
            {[lineStart, lineEnd].map((point, i) => (
              <line
                key={i}
                className="dimension-tick"
                x1={point.x - (normal.x - normal.y) * font * 0.075}
                y1={point.y - (normal.y + normal.x) * font * 0.075}
                x2={point.x + (normal.x - normal.y) * font * 0.075}
                y2={point.y + (normal.y + normal.x) * font * 0.075}
                vectorEffect="non-scaling-stroke"
              />
            ))}
            {staggered && (
              <line
                className="dimension-leader"
                x1={center.x}
                y1={center.y}
                x2={label.x}
                y2={label.y}
                vectorEffect="non-scaling-stroke"
              />
            )}
          </g>
        );
      })}
      {dimensions.map((dimension) => (
        <g key={dimension.edge} className="dimension-caption" data-edge={dimension.edge}>
          <rect {...dimension.labelBox} fill="white" />
          <text
            className="dimension-label"
            x={dimension.label.x}
            y={dimension.label.y}
            textAnchor="middle"
            dominantBaseline="central"
            fontSize={font}
            fill="#17263f"
          >
            {dimension.angle === undefined ? (
              dimension.text
            ) : (
              <>
                <tspan x={dimension.label.x} dy={-font * 0.6}>
                  {dimension.text}
                </tspan>{' '}
                <tspan x={dimension.label.x} dy={font * 1.2}>
                  {degree(dimension.angle)}
                </tspan>
              </>
            )}
          </text>
        </g>
      ))}
    </g>
  );
}

export function FlooringPreview({
  piece,
  compact = false,
}: {
  piece: FlooringPiece;
  compact?: boolean;
}) {
  const template = flooringTemplate(piece);
  const dimensions = compact
    ? undefined
    : dimensionedOutline(template, piece.shaped ? undefined : [0, 1]);
  const Wrapper = compact ? 'span' : 'figure';
  return (
    <Wrapper className={`flooring-preview-figure ${compact ? 'compact-preview' : 'exact-preview'}`}>
      <svg
        className="flooring-preview"
        viewBox={viewBox(dimensions?.box ?? fullPreviewBox(piece.length, piece.width))}
        preserveAspectRatio="xMidYMid meet"
        aria-hidden={compact || undefined}
        role={compact ? undefined : 'img'}
        aria-label={compact ? undefined : `Flooring shape ${piece.id}`}
      >
        <polygon
          points={template.map((point) => `${point.x},${point.y}`).join(' ')}
          fill="#dbeafe"
          stroke="#2563eb"
          strokeWidth={compact ? 1 : 1.5}
          vectorEffect="non-scaling-stroke"
        />
        {dimensions && <Dimensions dimensions={dimensions.dimensions} font={dimensions.font} />}
      </svg>
      {!compact && (
        <figcaption>
          {cutMm(piece.length)} × {cutMm(piece.width)} mm
          {dimensions?.dimensions.some((dimension) => dimension.angle !== undefined) &&
            ' · angles from horizontal'}
        </figcaption>
      )}
    </Wrapper>
  );
}

export function SkirtingPreview({
  piece,
  thickness,
  compact = false,
}: {
  piece: SkirtingPiece;
  thickness: number;
  compact?: boolean;
}) {
  const template = skirtingTemplate(piece, thickness);
  const Wrapper = compact ? 'span' : 'div';
  const EndWrapper = compact ? 'span' : 'figure';
  const Grid = compact ? 'span' : 'div';
  if (template.length !== 4) return <span className="helper">Shape template unavailable</span>;
  const boxes = skirtingEndBoxes(template, thickness);
  const dimensions = compact
    ? undefined
    : dimensionedOutline(
        [template[0], template[1], { x: piece.length, y: thickness }, { x: 0, y: thickness }],
        [0, 2],
      );
  // The lower dimension measures the overall blank, between its actual longest points.
  const overall = dimensions?.dimensions.find((dimension) => dimension.edge === 2);
  if (overall) {
    overall.start = template.reduce((a, b) => (a.x > b.x ? a : b));
    overall.end = template.reduce((a, b) => (a.x < b.x ? a : b));
  }
  const points = template.map((point) => `${point.x},${point.y}`).join(' ');
  const ends = [
    { side: 'left', back: template[0], front: template[3], box: boxes.left },
    { side: 'right', back: template[1], front: template[2], box: boxes.right },
  ] as const;
  return (
    <Wrapper className={`skirting-preview ${compact ? 'compact-preview' : 'exact-preview'}`}>
      {!compact && (
        <figure className="skirting-full-preview">
          <svg
            viewBox={viewBox(dimensions!.box)}
            preserveAspectRatio="xMidYMid meet"
            role="img"
            aria-label={`Full skirting shape ${piece.id}`}
          >
            <polygon
              points={points}
              fill="#ffedd5"
              stroke="#c2410c"
              strokeWidth={1}
              vectorEffect="non-scaling-stroke"
            />
            <Dimensions dimensions={dimensions!.dimensions} font={dimensions!.font} />
          </svg>
          <figcaption>
            {cutMm(piece.length)} × {cutMm(thickness)} mm · wall side above
          </figcaption>
        </figure>
      )}
      <Grid className="skirting-end-grid">
        {ends.map((end, index) => (
          <Fragment key={end.side}>
            <EndWrapper className={`skirting-end ${end.side}-end`}>
              <svg
                className="skirting-end-preview"
                data-end={end.side}
                viewBox={viewBox(end.box)}
                preserveAspectRatio="xMidYMid meet"
                overflow="hidden"
                aria-hidden={compact || undefined}
                role={compact ? undefined : 'img'}
                aria-label={
                  compact
                    ? undefined
                    : `${end.side === 'left' ? 'Left' : 'Right'} mitre close-up ${piece.id}`
                }
              >
                <polygon
                  points={points}
                  fill="#ffedd5"
                  stroke="#c2410c"
                  strokeWidth={1}
                  vectorEffect="non-scaling-stroke"
                />
                <line
                  className="skirting-cut-edge"
                  data-end={end.side}
                  x1={end.back.x}
                  y1={end.back.y}
                  x2={end.front.x}
                  y2={end.front.y}
                  stroke="#9a3412"
                  strokeWidth={compact ? 1.5 : 2.5}
                  vectorEffect="non-scaling-stroke"
                />
              </svg>
              {!compact && (
                <figcaption>
                  {index === 0 ? 'Left' : 'Right'} ·{' '}
                  {degree(index === 0 ? piece.leftMitre : piece.rightMitre)}{' '}
                  {index === 0 ? piece.leftType : piece.rightType}
                </figcaption>
              )}
            </EndWrapper>
            {index === 0 && (
              <span className="board-break" aria-hidden="true">
                //
              </span>
            )}
          </Fragment>
        ))}
      </Grid>
    </Wrapper>
  );
}