editor/src/components/PropertyGroup.tsx

import React from "react";

import FieldFunction from "./FieldFunction";
import type {LayerSpecification} from "maplibre-gl";
import { type MappedLayerErrors } from "../libs/definitions";

const iconProperties = ["background-pattern", "fill-pattern", "line-pattern", "fill-extrusion-pattern", "icon-image"];

/** Extract field spec by {@fieldName} from the {@layerType} in the
 * style specification from either the paint or layout group */
function getFieldSpec(spec: any, layerType: LayerSpecification["type"], fieldName: string) {
  const groupName = getGroupName(spec, layerType, fieldName);
  const group = spec[groupName + "_" + layerType];
  const fieldSpec = group[fieldName];
  if(iconProperties.indexOf(fieldName) >= 0) {
    return {
      ...fieldSpec,
      values: spec.$root.sprite.values
    };
  }
  if(fieldName === "text-font") {
    return {
      ...fieldSpec,
      values: spec.$root.glyphs.values
    };
  }
  return fieldSpec;
}

function getGroupName(spec: any, layerType: LayerSpecification["type"], fieldName: string): "paint" | "layout" {
  const paint = spec["paint_" + layerType] || {};
  return (fieldName in paint) ? "paint" : "layout";
}

type PropertyGroupProps = {
  layer: LayerSpecification
  groupFields: string[]
  onChange(...args: unknown[]): unknown
  spec: any
  errors?: MappedLayerErrors
};

export default class PropertyGroup extends React.Component<PropertyGroupProps> {
  onPropertyChange = (property: string, newValue: any) => {
    const group = getGroupName(this.props.spec, this.props.layer.type, property);
    this.props.onChange(group ,property, newValue);
  };

  render() {
    const {errors} = this.props;
    const fields = this.props.groupFields.map(fieldName => {
      const fieldSpec = getFieldSpec(this.props.spec, this.props.layer.type, fieldName);

      const paint = this.props.layer.paint || {};
      const layout = this.props.layer.layout || {};
      const fieldValue = fieldName in paint
        ? paint[fieldName as keyof typeof paint]
        : layout[fieldName as keyof typeof layout];
      const fieldType = fieldName in paint ? "paint" : "layout";

      return <FieldFunction
        errors={errors}
        onChange={this.onPropertyChange}
        key={fieldName}
        fieldName={fieldName}
        value={fieldValue}
        fieldType={fieldType}
        fieldSpec={fieldSpec}
      />;
    });

    return <div className="maputnik-property-group">
      {fields}
    </div>;
  }
}