import { OpenAssistantTool } from '@openassistant/utils';
import { z } from 'zod';
import { SpatialToolContext } from '../types';
export type LengthFunctionArgs = z.ZodObject<{
    geojson: z.ZodOptional<z.ZodString>;
    datasetName: z.ZodOptional<z.ZodString>;
    distanceUnit: z.ZodDefault<z.ZodEnum<['KM', 'Mile']>>;
}>;
export type LengthLlmResult = {
    success: boolean;
    result: string;
    lengths: number[];
    distanceUnit: 'KM' | 'Mile';
};
export type LengthAdditionalData = {
    datasetName?: string;
    geojson?: string;
    lengths: number[];
    distanceUnit: 'KM' | 'Mile';
};
/**
 * ## length Tool
 *
 * This tool calculates the length of geometries in a GeoJSON dataset.
 * It supports both direct GeoJSON input and dataset names, and can calculate lengths in either kilometers or miles.
 *
 * ### Length Calculation
 *
 * The tool calculates lengths for various geometry types:
 * - **LineStrings**: Calculates the total length of line features
 * - **MultiLineStrings**: Calculates the total length of multiline features
 * - **Polygons**: Calculates the perimeter length of polygon boundaries
 * - **FeatureCollections**: Calculates lengths for all line features in the collection
 *
 * ### Parameters
 * - `datasetName`: Name of the dataset with geometries to calculate length for (optional)
 * - `geojson`: GeoJSON string of geometries to calculate length for (optional)
 * - `distanceUnit`: Unit for length calculation - 'KM' for kilometers or 'Mile' for miles
 *
 * **Example user prompts:**
 * - "Calculate the length of these roads in kilometers"
 * - "What is the total length of the river network in miles?"
 * - "Measure the length of these boundaries"
 *
 * ### Example
 * ```typescript
 * import { length } from "@openassistant/geoda";
 * import { convertToVercelAiTool } from "@openassistant/utils";
 *
 * const lengthTool = {
 *   ...length,
 *   context: {
 *     getGeometries: async (datasetName: string) => {
 *       // Implementation to retrieve geometries from your data source
 *       return geometries;
 *     },
 *   },
 * };
 *
 * const result = await generateText({
 *   model: openai('gpt-4.1', { apiKey: key }),
 *   prompt: 'Calculate the length of these roads in kilometers',
 *   tools: { length: convertToVercelAiTool(lengthTool) },
 * });
 * ```
 */
export declare const length: OpenAssistantTool<LengthFunctionArgs, LengthLlmResult, LengthAdditionalData, SpatialToolContext>;