import Konva from 'konva';

import { DEFAULT_STANDARD_FONT_SIZE } from '../../constants/pdf';
import type { TRadioFieldMeta } from '../../types/field-meta';
import { upsertFieldGroup, upsertFieldRect } from './field-generic-items';
import { calculateFieldPosition, calculateMultiItemPosition } from './field-renderer';
import type { FieldToRender, RenderFieldElementOptions } from './field-renderer';

// Do not change any of these values without consulting with the team.
const radioFieldPadding = 8;
const radioSize = 16;
const spacingBetweenRadioAndText = 8;

export const renderRadioFieldElement = (
  field: FieldToRender,
  options: RenderFieldElementOptions,
) => {
  const { pageWidth, pageHeight, pageLayer, mode } = options;

  const isFirstRender = !pageLayer.findOne(`#${field.renderId}`);

  const fieldGroup = upsertFieldGroup(field, options);

  // Clear previous children to re-render fresh
  fieldGroup.removeChildren();

  fieldGroup.add(upsertFieldRect(field, options));

  if (isFirstRender) {
    pageLayer.add(fieldGroup);

    // Handle rescaling items during transforms.
    fieldGroup.on('transform', () => {
      const groupScaleX = fieldGroup.scaleX();
      const groupScaleY = fieldGroup.scaleY();

      const fieldRect = fieldGroup.findOne('.field-rect');

      if (!fieldRect) {
        return;
      }

      const rectWidth = fieldRect.width() * groupScaleX;
      const rectHeight = fieldRect.height() * groupScaleY;

      const circles = fieldGroup.find('.radio-circle').sort((a, b) => a.id().localeCompare(b.id()));
      const checkmarks = fieldGroup.find('.radio-dot').sort((a, b) => a.id().localeCompare(b.id()));
      const text = fieldGroup.find('.radio-text').sort((a, b) => a.id().localeCompare(b.id()));

      const groupedItems = circles.map((circle, i) => ({
        circleElement: circle,
        checkmarkElement: checkmarks[i],
        textElement: text[i],
      }));

      groupedItems.forEach((item, i) => {
        const { circleElement, checkmarkElement, textElement } = item;

        const { itemInputX, itemInputY, textX, textY, textWidth, textHeight } =
          calculateMultiItemPosition({
            fieldWidth: rectWidth,
            fieldHeight: rectHeight,
            itemCount: radioValues.length,
            itemIndex: i,
            itemSize: radioSize,
            spacingBetweenItemAndText: spacingBetweenRadioAndText,
            fieldPadding: radioFieldPadding,
            type: 'radio',
          });

        circleElement.setAttrs({
          x: itemInputX,
          y: itemInputY,
          scaleX: 1,
          scaleY: 1,
        });

        checkmarkElement.setAttrs({
          x: itemInputX,
          y: itemInputY,
          scaleX: 1,
          scaleY: 1,
        });

        textElement.setAttrs({
          x: textX,
          y: textY,
          scaleX: 1,
          scaleY: 1,
          width: textWidth,
          height: textHeight,
        });
      });

      fieldRect.width(rectWidth);
      fieldRect.height(rectHeight);

      fieldGroup.scale({
        x: 1,
        y: 1,
      });

      pageLayer.batchDraw();
    });
  }

  const radioMeta: TRadioFieldMeta | null = (field.fieldMeta as TRadioFieldMeta) || null;
  const radioValues = radioMeta?.values || [];

  const { fieldWidth, fieldHeight } = calculateFieldPosition(field, pageWidth, pageHeight);

  radioValues.forEach(({ value, checked }, index) => {
    const { itemInputX, itemInputY, textX, textY, textWidth, textHeight } =
      calculateMultiItemPosition({
        fieldWidth,
        fieldHeight,
        itemCount: radioValues.length,
        itemIndex: index,
        itemSize: radioSize,
        spacingBetweenItemAndText: spacingBetweenRadioAndText,
        fieldPadding: radioFieldPadding,
        type: 'radio',
      });

    // Circle which represents the radio button.
    const circle = new Konva.Circle({
      internalRadioValue: value,
      id: `radio-circle-${index}`,
      name: 'radio-circle',
      x: itemInputX,
      y: itemInputY,
      radius: radioSize / 2,
      stroke: '#374151',
      strokeWidth: 2,
      fill: 'white',
    });

    // Dot which represents the selected state.
    const dot = new Konva.Circle({
      internalRadioValue: value,
      id: `radio-dot-${index}`,
      name: 'radio-dot',
      x: itemInputX,
      y: itemInputY,
      radius: radioSize / 4,
      fill: '#111827',
      // Todo: Envelopes
      visible: value === field.customText,
      // visible: checked,
    });

    const text = new Konva.Text({
      internalRadioValue: value,
      id: `radio-text-${index}`,
      name: 'radio-text',
      x: textX,
      y: textY,
      text: value,
      width: textWidth,
      height: textHeight,
      fontSize: DEFAULT_STANDARD_FONT_SIZE,
      fontFamily: 'Inter, system-ui, sans-serif',
      verticalAlign: 'middle',
      fill: '#111827', // Todo: Envelopes - Sort colours
    });

    fieldGroup.add(circle);
    fieldGroup.add(dot);
    fieldGroup.add(text);
  });

  return {
    fieldGroup,
    isFirstRender,
  };
};