// loaders.gl
// SPDX-License-Identifier: MIT
// Copyright (c) vis.gl contributors
/** Array containing all encodings */
const GEOARROW_ENCODINGS = [
    'geoarrow.multipolygon',
    'geoarrow.polygon',
    'geoarrow.multilinestring',
    'geoarrow.linestring',
    'geoarrow.multipoint',
    'geoarrow.point',
    'geoarrow.wkb',
    'geoarrow.wkt'
];
const GEOARROW_COLUMN_METADATA_ENCODING = 'ARROW:extension:name';
const GEOARROW_COLUMN_METADATA_METADATA = 'ARROW:extension:metadata';
/**
 * get geometry columns from arrow table
 */
export function getGeometryColumnsFromSchema(schema) {
    const geometryColumns = {};
    for (const field of schema.fields) {
        const metadata = getGeometryMetadataForField(field);
        if (metadata) {
            geometryColumns[field.name] = metadata;
        }
    }
    return geometryColumns;
}
/**
 * Extracts GeoArrow metadata from a field
 * @param field
 * @returns
 * @see https://github.com/geoarrow/geoarrow/blob/d2f56704414d9ae71e8a5170a8671343ed15eefe/extension-types.md
 */
export function getGeometryMetadataForField(field) {
    let metadata = null;
    // Check for GeoArrow column encoding
    let geoEncoding = field.metadata?.[GEOARROW_COLUMN_METADATA_ENCODING];
    if (geoEncoding) {
        geoEncoding = geoEncoding.toLowerCase();
        // at time of testing, ogr2ogr uses WKB/WKT for encoding.
        if (geoEncoding === 'wkb') {
            geoEncoding = 'geoarrow.wkb';
        }
        if (geoEncoding === 'wkt') {
            geoEncoding = 'geoarrow.wkt';
        }
        if (!GEOARROW_ENCODINGS.includes(geoEncoding)) {
            // eslint-disable-next-line no-console
            console.warn(`Invalid GeoArrow encoding: ${geoEncoding}`);
        }
        else {
            metadata = metadata || {};
            metadata.encoding = geoEncoding;
        }
    }
    // Check for GeoArrow metadata
    const columnMetadata = field.metadata?.[GEOARROW_COLUMN_METADATA_METADATA];
    if (columnMetadata) {
        try {
            metadata = JSON.parse(columnMetadata);
        }
        catch (error) {
            // eslint-disable-next-line no-console
            console.warn('Failed to parse GeoArrow metadata', error);
        }
    }
    return metadata || null;
}