import {RawSourceMap} from 'source-map-js';

import {Options, StringOptions} from './options';

/**
 * The result of compiling Sass to CSS. Returned by [[compile]],
 * [[compileAsync]], [[compileString]], and [[compileStringAsync]].
 *
 * @category Compile
 */
export interface CompileResult {
  /**
   * The generated CSS.
   *
   * Note that this *never* includes a `sourceMapUrl` comment—it's up to the
   * caller to determine where to save the source map and how to link to it from
   * the stylesheet.
   */
  css: string;

  /**
   * The canonical URLs of all the stylesheets that were loaded during the
   * Sass compilation. The order of these URLs is not guaranteed.
   */
  loadedUrls: URL[];

  /**
   * The object representation of the source map that maps locations in the
   * generated CSS back to locations in the Sass source code.
   *
   * This typically uses absolute `file:` URLs to refer to Sass files, although
   * this can be controlled by having a custom [[Importer]] return
   * [[ImporterResult.sourceMapUrl]].
   *
   * This is set if and only if [[Options.sourceMap]] is `true`.
   */
  sourceMap?: RawSourceMap;
}

/**
 * Synchronously compiles the Sass file at `path` to CSS. If it succeeds it
 * returns a [[CompileResult]], and if it fails it throws an [[Exception]].
 *
 * This only allows synchronous [[Importer]]s and [[CustomFunction]]s.
 *
 * @example
 *
 * ```js
 * const sass = require('sass');
 *
 * const result = sass.compile("style.scss");
 * console.log(result.css);
 * ```
 *
 * @category Compile
 * @compatibility dart: "1.45.0", node: false
 */
export function compile(path: string, options?: Options<'sync'>): CompileResult;

/**
 * Asynchronously compiles the Sass file at `path` to CSS. Returns a promise
 * that resolves with a [[CompileResult]] if it succeeds and rejects with an
 * [[Exception]] if it fails.
 *
 * This only allows synchronous or asynchronous [[Importer]]s and
 * [[CustomFunction]]s.
 *
 * **Heads up!** When using Dart Sass, **[[compile]] is almost twice as fast as
 * [[compileAsync]]**, due to the overhead of making the entire evaluation
 * process asynchronous.
 *
 * @example
 *
 * ```js
 * const sass = require('sass');
 *
 * const result = await sass.compileAsync("style.scss");
 * console.log(result.css);
 * ```
 *
 * @category Compile
 * @compatibility dart: "1.45.0", node: false
 */
export function compileAsync(
  path: string,
  options?: Options<'async'>
): Promise<CompileResult>;

/**
 * Synchronously compiles a stylesheet whose contents is `source` to CSS. If it
 * succeeds it returns a [[CompileResult]], and if it fails it throws an
 * [[Exception]].
 *
 * This only allows synchronous [[Importer]]s and [[CustomFunction]]s.
 *
 * @example
 *
 * ```js
 * const sass = require('sass');
 *
 * const result = sass.compileString(`
 * h1 {
 *   font-size: 40px;
 *   code {
 *     font-face: Roboto Mono;
 *   }
 * }`);
 * console.log(result.css);
 * ```
 *
 * @category Compile
 * @compatibility dart: "1.45.0", node: false
 */
export function compileString(
  source: string,
  options?: StringOptions<'sync'>
): CompileResult;

/**
 * Asynchronously compiles a stylesheet whose contents is `source` to CSS.
 * Returns a promise that resolves with a [[CompileResult]] if it succeeds and
 * rejects with an [[Exception]] if it fails.
 *
 * This only allows synchronous or asynchronous [[Importer]]s and
 * [[CustomFunction]]s.
 *
 * **Heads up!** When using Dart Sass, **[[compile]] is almost twice as fast as
 * [[compileAsync]]**, due to the overhead of making the entire evaluation
 * process asynchronous.
 *
 * @example
 *
 * ```js
 * const sass = require('sass');
 *
 * const result = await sass.compileStringAsync(`
 * h1 {
 *   font-size: 40px;
 *   code {
 *     font-face: Roboto Mono;
 *   }
 * }`);
 * console.log(result.css);
 * ```
 *
 * @category Compile
 * @compatibility dart: "1.45.0", node: false
 */
export function compileStringAsync(
  source: string,
  options?: StringOptions<'async'>
): Promise<CompileResult>;