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import { DataFactory, type RDF } from "../rdf.ts";import xsd from "../namespaces/xsd.ts";
import { stringify } from "./stringify.ts";
export type SparqlValue =  | RDF.Term  | string  | number  | boolean  | Date  | Iterable<SparqlValue>  | null  | undefined;
export const sparql = (  strings: TemplateStringsArray,  ...values: SparqlValue[]) => {  let counter = 0;  let result = "";
  for (const value of values) {    result += strings[counter++];
    result += valueToString(value);  }
  result += strings[counter];
  return result;};
const isIterable = (obj: unknown): obj is Iterable<unknown> => {  return Symbol.iterator in Object(obj);};
const df = new DataFactory();
const valueToString = (value: SparqlValue): string => {  if (typeof value === "undefined" || value === null) {    return "";  }
  if (typeof value === "string") {    return value;  }
  if (typeof value === "number") {    const numberDataType = Number.isInteger(value) ? xsd.integer : xsd.decimal;    return stringify(      df.literal(value.toString(), df.namedNode(numberDataType)),    );  }  if (typeof value === "boolean") {    return stringify(df.literal(value.toString(), df.namedNode(xsd.boolean)));  }  if (value instanceof Date) {    return stringify(      df.literal(value.toISOString(), df.namedNode(xsd.dateTime)),    );  }
  if (isIterable(value)) {    const [first, ...rest] = value;    let result = valueToString(first);
    for (const part of rest) {      result += `\n${valueToString(part)}`;    }    return result;  }
  if (value.termType) {    return stringify(value);  }
  throw new Error("Not supported input type detected.");};