import {Logger} from '../logger';
import {LegacyImporter} from './importer';
import {LegacyFunction} from './function';

/**
 * Options for [[render]] and [[renderSync]] that are shared between
 * [[LegacyFileOptions]] and [[LegacyStringOptions]].
 *
 * @typeParam sync - This lets the TypeScript checker verify that
 * [[LegacyAsyncImporter]]s and [[LegacyAsyncFunction]]s aren't passed to
 * [[renderSync]].
 *
 * @category Legacy
 * @deprecated This only works with the legacy [[render]] and [[renderSync]]
 * APIs. Use [[Options]] with [[compile]], [[compileString]], [[compileAsync]],
 * and [[compileStringAsync]] instead.
 */
export interface LegacySharedOptions<sync extends 'sync' | 'async'> {
  /**
   * This array of strings option provides [load
   * paths](https://sass-lang.com/documentation/at-rules/import#load-paths) for
   * Sass to look for stylesheets. Earlier load paths will take precedence over
   * later ones.
   *
   * ```js
   * sass.renderSync({
   *   file: "style.scss",
   *   includePaths: ["node_modules/bootstrap/dist/css"]
   * });
   * ```
   *
   * Load paths are also loaded from the `SASS_PATH` environment variable, if
   * it’s set. This variable should be a list of paths separated by `;` (on
   * Windows) or `:` (on other operating systems). Load paths from the
   * `includePaths` option take precedence over load paths from `SASS_PATH`.
   *
   * ```sh
   * $ SASS_PATH=node_modules/bootstrap/dist/css sass style.scss style.css
   * ```
   *
   * @category Input
   * @compatibility feature: "SASS_PATH", dart: "1.15.0", node: "3.9.0"
   *
   * Earlier versions of Dart Sass and Node Sass didn’t support the `SASS_PATH`
   * environment variable.
   */
  includePaths?: string[];

  /**
   * Whether the generated CSS should use spaces or tabs for indentation.
   *
   * ```js
   * const result = sass.renderSync({
   *   file: "style.scss",
   *   indentType: "tab",
   *   indentWidth: 1
   * });
   *
   * result.css.toString();
   * // "h1 {\n\tfont-size: 40px;\n}\n"
   * ```
   *
   * @defaultValue `'space'`
   * @category Output
   * @compatibility dart: true, node: "3.0.0"
   */
  indentType?: 'space' | 'tab';

  /**
   * How many spaces or tabs (depending on [[indentType]]) should be used per
   * indentation level in the generated CSS. It must be between 0 and 10
   * (inclusive).
   *
   * @defaultValue `2`
   * @category Output
   * @compatibility dart: true, node: "3.0.0"
   */
  indentWidth?: number;

  /**
   * Which character sequence to use at the end of each line in the generated
   * CSS. It can have the following values:
   *
   * * `'lf'` uses U+000A LINE FEED.
   * * `'lfcr'` uses U+000A LINE FEED followed by U+000D CARRIAGE RETURN.
   * * `'cr'` uses U+000D CARRIAGE RETURN.
   * * `'crlf'` uses U+000D CARRIAGE RETURN followed by U+000A LINE FEED.
   *
   * @defaultValue `'lf'`
   * @category Output
   * @compatibility dart: true, node: "3.0.0"
   */
  linefeed?: 'cr' | 'crlf' | 'lf' | 'lfcr';

  /**
   * If `true`, Sass won't add a link from the generated CSS to the source map.
   *
   * ```js
   * const result = sass.renderSync({
   *   file: "style.scss",
   *   sourceMap: "out.map",
   *   omitSourceMapUrl: true
   * })
   * console.log(result.css.toString());
   * // h1 {
   * //   font-size: 40px;
   * // }
   * ```
   *
   * @defaultValue `false`
   * @category Source Maps
   */
  omitSourceMapUrl?: boolean;

  /**
   * The location that Sass expects the generated CSS to be saved to. It’s used
   * to determine the URL used to link from the generated CSS to the source map,
   * and from the source map to the Sass source files.
   *
   * **Heads up!** Despite the name, Sass does *not* write the CSS output to
   * this file. The caller must do that themselves.
   *
   * ```js
   * result = sass.renderSync({
   *   file: "style.scss",
   *   sourceMap: true,
   *   outFile: "out.css"
   * })
   * console.log(result.css.toString());
   * // h1 {
   * //   font-size: 40px;
   * // }
   * // /*# sourceMappingURL=out.css.map * /
   * ```
   *
   * @category Source Maps
   */
  outFile?: string;

  /**
   * The output style of the compiled CSS. There are four possible output styles:
   *
   * * `"expanded"` (the default for Dart Sass) writes each selector and
   *   declaration on its own line.
   *
   * * `"compressed"` removes as many extra characters as possible, and writes
   *   the entire stylesheet on a single line.
   *
   * * `"nested"` (the default for Node Sass, not supported by Dart Sass)
   *   indents CSS rules to match the nesting of the Sass source.
   *
   * * `"compact"` (not supported by Dart Sass) puts each CSS rule on its own single line.
   *
   * @example
   *
   * ```js
   * const source = `
   * h1 {
   *   font-size: 40px;
   *   code {
   *     font-face: Roboto Mono;
   *   }
   * }`;
   *
   * let result = sass.renderSync({
   *   data: source,
   *   outputStyle: "expanded"
   * });
   * console.log(result.css.toString());
   * // h1 {
   * //   font-size: 40px;
   * // }
   * // h1 code {
   * //   font-face: Roboto Mono;
   * // }
   *
   * result = sass.renderSync({
   *   data: source,
   *   outputStyle: "compressed"
   * });
   * console.log(result.css.toString());
   * // h1{font-size:40px}h1 code{font-face:Roboto Mono}
   *
   * result = sass.renderSync({
   *   data: source,
   *   outputStyle: "nested"
   * });
   * console.log(result.css.toString());
   * // h1 {
   * //   font-size: 40px; }
   * //   h1 code {
   * //     font-face: Roboto Mono; }
   *
   * result = sass.renderSync({
   *   data: source,
   *   outputStyle: "compact"
   * });
   * console.log(result.css.toString());
   * // h1 { font-size: 40px; }
   * // h1 code { font-face: Roboto Mono; }
   * ```
   *
   * @category Output
   */
  outputStyle?: 'compressed' | 'expanded' | 'nested' | 'compact';

  /**
   * Whether or not Sass should generate a source map. If it does, the source
   * map will be available as [[LegacyResult.map]] (unless [[sourceMapEmbed]] is
   * `true`).
   *
   * If this option is a string, it’s the path that the source map is expected
   * to be written to, which is used to link to the source map from the
   * generated CSS and to link *from* the source map to the Sass source files.
   * Note that if `sourceMap` is a string and [[outFile]] isn’t passed, Sass
   * assumes that the CSS will be written to the same directory as the file
   * option if it’s passed.
   *
   * If this option is `true`, the path is assumed to be [[outFile]] with `.map`
   * added to the end. If it’s `true` and [[outFile]] isn’t passed, it has no
   * effect.
   *
   * @example
   *
   * ```js
   * let result = sass.renderSync({
   *   file: "style.scss",
   *   sourceMap: "out.map"
   * })
   * console.log(result.css.toString());
   * // h1 {
   * //   font-size: 40px;
   * // }
   * // /*# sourceMappingURL=out.map * /
   *
   * result = sass.renderSync({
   *   file: "style.scss",
   *   sourceMap: true,
   *   outFile: "out.css"
   * })
   * console.log(result.css.toString());
   * // h1 {
   * //   font-size: 40px;
   * // }
   * // /*# sourceMappingURL=out.css.map * /
   * ```
   *
   * @defaultValue `false`
   * @category Source Maps
   */
  sourceMap?: boolean | string;

  /**
   * Whether to embed the entire contents of the Sass files that contributed to
   * the generated CSS in the source map. This may produce very large source
   * maps, but it guarantees that the source will be available on any computer
   * no matter how the CSS is served.
   *
   * @example
   *
   * ```js
   * sass.renderSync({
   *   file: "style.scss",
   *   sourceMap: "out.map",
   *   sourceMapContents: true
   * })
   * ```
   *
   * @defaultValue `false`
   * @category Source Maps
   */
  sourceMapContents?: boolean;

  /**
   * Whether to embed the contents of the source map file in the generated CSS,
   * rather than creating a separate file and linking to it from the CSS.
   *
   * @example
   *
   * ```js
   * sass.renderSync({
   *   file: "style.scss",
   *   sourceMap: "out.map",
   *   sourceMapEmbed: true
   * });
   * ```
   *
   * @defaultValue `false`
   * @category Source Maps
   */
  sourceMapEmbed?: boolean;

  /**
   * If this is passed, it's prepended to all the links from the source map to
   * the Sass source files.
   *
   * @category Source Maps
   */
  sourceMapRoot?: string;

  /**
   * Additional handler(s) for loading files when a [`@use`
   * rule](https://sass-lang.com/documentation/at-rules/use) or an [`@import`
   * rule](https://sass-lang.com/documentation/at-rules/import) is encountered.
   * It can either be a single [[LegacyImporter]] function, or an array of
   * [[LegacyImporter]]s.
   *
   * Importers take the URL of the `@import` or `@use` rule and return a
   * [[LegacyImporterResult]] indicating how to handle that rule. For more
   * details, see [[LegacySyncImporter]] and [[LegacyAsyncImporter]].
   *
   * Loads are resolved by trying, in order:
   *
   * * Loading a file from disk relative to the file in which the `@use` or
   *   `@import` appeared.
   *
   * * Each custom importer.
   *
   * * Loading a file relative to the current working directory.
   *
   * * Each load path in [[includePaths]].
   *
   * * Each load path specified in the `SASS_PATH` environment variable, which
   *   should be semicolon-separated on Windows and colon-separated elsewhere.
   *
   * @example
   *
   * ```js
   * sass.render({
   *   file: "style.scss",
   *   importer: [
   *     // This importer uses the synchronous API, and can be passed to either
   *     // renderSync() or render().
   *     function(url, prev) {
   *       // This generates a stylesheet from scratch for `@use "big-headers"`.
   *       if (url != "big-headers") return null;
   *
   *       return {
   *         contents: `
   * h1 {
   *   font-size: 40px;
   * }`
   *       };
   *     },
   *
   *     // This importer uses the asynchronous API, and can only be passed to
   *     // render().
   *     function(url, prev, done) {
   *       // Convert `@use "foo/bar"` to "node_modules/foo/sass/bar".
   *       const components = url.split('/');
   *       const innerPath = components.slice(1).join('/');
   *       done({
   *         file: `node_modules/${components.first}/sass/${innerPath}`
   *       });
   *     }
   *   ]
   * }, function(err, result) {
   *   // ...
   * });
   * ```
   *
   * @category Plugins
   * @compatibility dart: true, node: "3.0.0"
   *
   * Versions of Node Sass before 3.0.0 don’t support arrays of importers, nor
   * do they support importers that return `Error` objects.
   *
   * Versions of Node Sass before 2.0.0 don’t support the `importer` option at
   * all.
   *
   * @compatibility feature: "Import order", dart: "1.20.2", node: false
   *
   * Versions of Dart Sass before 1.20.2 preferred resolving imports using
   * [[includePaths]] before resolving them using custom importers.
   *
   * All versions of Node Sass currently pass imports to importers before
   * loading them relative to the file in which the `@import` appears. This
   * behavior is considered incorrect and should not be relied on because it
   * violates the principle of *locality*, which says that it should be possible
   * to reason about a stylesheet without knowing everything about how the
   * entire system is set up. If a user tries to import a stylesheet relative to
   * another stylesheet, that import should *always* work. It shouldn’t be
   * possible for some configuration somewhere else to break it.
   */
  importer?: LegacyImporter<sync> | LegacyImporter<sync>[];

  /**
   * Additional built-in Sass functions that are available in all stylesheets.
   * This option takes an object whose keys are Sass function signatures and
   * whose values are [[LegacyFunction]]s. Each function should take the same
   * arguments as its signature.
   *
   * Functions are passed JavaScript representations of [Sass value
   * types](https://sass-lang.com/documentation/js-api#value-types), and must
   * return the same.
   *
   * **Heads up!** When writing custom functions, it’s important to ensure that
   * all the arguments are the types you expect. Otherwise, users’ stylesheets
   * could crash in hard-to-debug ways or, worse, compile to meaningless CSS.
   *
   * @example
   *
   * ```js
   * sass.render({
   *   data: `
   * h1 {
   *   font-size: pow(2, 5) * 1px;
   * }`,
   *   functions: {
   *     // This function uses the synchronous API, and can be passed to either
   *     // renderSync() or render().
   *     'pow($base, $exponent)': function(base, exponent) {
   *       if (!(base instanceof sass.types.Number)) {
   *         throw "$base: Expected a number.";
   *       } else if (base.getUnit()) {
   *         throw "$base: Expected a unitless number.";
   *       }
   *
   *       if (!(exponent instanceof sass.types.Number)) {
   *         throw "$exponent: Expected a number.";
   *       } else if (exponent.getUnit()) {
   *         throw "$exponent: Expected a unitless number.";
   *       }
   *
   *       return new sass.types.Number(
   *           Math.pow(base.getValue(), exponent.getValue()));
   *     },
   *
   *     // This function uses the asynchronous API, and can only be passed to
   *     // render().
   *     'sqrt($number)': function(number, done) {
   *       if (!(number instanceof sass.types.Number)) {
   *         throw "$number: Expected a number.";
   *       } else if (number.getUnit()) {
   *         throw "$number: Expected a unitless number.";
   *       }
   *
   *       done(new sass.types.Number(Math.sqrt(number.getValue())));
   *     }
   *   }
   * }, function(err, result) {
   *   console.log(result.css.toString());
   *   // h1 {
   *   //   font-size: 32px;
   *   // }
   * });
   * ```
   *
   * @category Plugins
   */
  functions?: {[key: string]: LegacyFunction<sync>};

  /**
   * By default, if the CSS document contains non-ASCII characters, Sass adds a
   * `@charset` declaration (in expanded output mode) or a byte-order mark (in
   * compressed mode) to indicate its encoding to browsers or other consumers.
   * If `charset` is `false`, these annotations are omitted.
   *
   * @category Output
   * @compatibility dart: "1.39.0", node: false
   */
  charset?: boolean;

  /**
   * If this option is set to `true`, Sass won’t print warnings that are caused
   * by dependencies. A “dependency” is defined as any file that’s loaded
   * through [[loadPaths]] or [[importer]]. Stylesheets that are imported
   * relative to the entrypoint are not considered dependencies.
   *
   * This is useful for silencing deprecation warnings that you can’t fix on
   * your own. However, please <em>also</em> notify your dependencies of the deprecations
   * so that they can get fixed as soon as possible!
   *
   * **Heads up!** If [[render]] or [[renderSync]] is called without
   * [[LegacyFileOptions.file]] or [[LegacyStringOptions.file]], <em>all</em>
   * stylesheets it loads will be considered dependencies. Since it doesn’t have
   * a path of its own, everything it loads is coming from a load path rather
   * than a relative import.
   *
   * @defaultValue `false`
   * @category Messages
   * @compatibility dart: "1.35.0", node: false
   */
  quietDeps?: boolean;

  /**
   * By default, Dart Sass will print only five instances of the same
   * deprecation warning per compilation to avoid deluging users in console
   * noise. If you set `verbose` to `true`, it will instead print every
   * deprecation warning it encounters.
   *
   * @defaultValue `false`
   * @category Messages
   * @compatibility dart: "1.35.0", node: false
   */
  verbose?: boolean;

  /**
   * An object to use to handle warnings and/or debug messages from Sass.
   *
   * By default, Sass emits warnings and debug messages to standard error, but
   * if [[Logger.warn]] or [[Logger.debug]] is set, this will invoke them
   * instead.
   *
   * The special value [[Logger.silent]] can be used to easily silence all
   * messages.
   *
   * @category Messages
   * @compatibility dart: "1.43.0", node: false
   */
  logger?: Logger;
}

/**
 * If [[file]] is passed without [[data]], Sass will load the stylesheet at
 * [[file]] and compile it to CSS.
 *
 * @typeParam sync - This lets the TypeScript checker verify that
 * [[LegacyAsyncImporter]]s and [[LegacyAsyncFunction]]s aren't passed to
 * [[renderSync]].
 */
export interface LegacyFileOptions<sync extends 'sync' | 'async'>
  extends LegacySharedOptions<sync> {
  /**
   * The path to the file for Sass to load and compile. If the file’s extension
   * is `.scss`, it will be parsed as SCSS; if it’s `.sass`, it will be parsed
   * as the indented syntax; and if it’s `.css`, it will be parsed as plain CSS.
   * If it has no extension, it will be parsed as SCSS.
   *
   * @example
   *
   * ```js
   * sass.renderSync({file: "style.scss"});
   * ```
   *
   * @category Input
   * @compatibility feature: "Plain CSS files", dart: "1.11.0", node: "partial"
   *
   * Node Sass and older versions of Dart Sass support loading files with the
   * extension `.css`, but contrary to the specification they’re treated as SCSS
   * files rather than being parsed as CSS. This behavior has been deprecated
   * and should not be relied on. Any files that use Sass features should use
   * the `.scss` extension.
   *
   * All versions of Node Sass and Dart Sass otherwise support the file option
   * as described below.
   */
  file: string;

  /**
   * See [[LegacyStringOptions.file]] for documentation of passing [[file]] along
   * with [[data]].
   *
   * @category Input
   */
  data?: never;
}

/**
 * If [[data]] is passed, Sass will use it as the contents of the stylesheet to
 * compile.
 *
 * @typeParam sync - This lets the TypeScript checker verify that
 * [[LegacyAsyncImporter]]s and [[LegacyAsyncFunction]]s aren't passed to
 * [[renderSync]].
 *
 * @category Legacy
 * @deprecated This only works with the legacy [[render]] and [[renderSync]]
 * APIs. Use [[StringOptions]] with [[compile]], [[compileString]],
 * [[compileAsync]], and [[compileStringAsync]] instead.
 */
export interface LegacyStringOptions<sync extends 'sync' | 'async'>
  extends LegacySharedOptions<sync> {
  /**
   * The contents of the stylesheet to compile. Unless [[file]] is passed as
   * well, the stylesheet’s URL is set to `"stdin"`.
   *
   * By default, this stylesheet is parsed as SCSS. This can be controlled using
   * [[indentedSyntax]].
   *
   * @example
   *
   * ```js
   * sass.renderSync({
   *   data: `
   * h1 {
   *   font-size: 40px;
   * }`
   * });
   * ```
   *
   * @category Input
   */
  data: string;

  /**
   * If `file` and [[data]] are both passed, `file` is used as the path of the
   * stylesheet for error reporting, but [[data]] is used as the contents of the
   * stylesheet. In this case, `file`’s extension is not used to determine the
   * syntax of the stylesheet.
   *
   * @category Input
   */
  file?: string;

  /**
   * This flag controls whether [[data]] is parsed as the indented syntax or
   * not.
   *
   * @example
   *
   * ```js
   * sass.renderSync({
   *   data: `
   * h1
   *   font-size: 40px`,
   *   indentedSyntax: true
   * });
   * ```
   *
   * @defaultValue `false`
   * @category Input
   */
  indentedSyntax?: boolean;
}

/**
 * Options for [[render]] and [[renderSync]]. This can either be
 * [[LegacyFileOptions]] to load a file from disk, or [[LegacyStringOptions]] to
 * compile a string of Sass code.
 *
 * See [[LegacySharedOptions]] for options that are shared across both file and
 * string inputs.
 *
 * @category Legacy
 * @deprecated This only works with the legacy [[render]] and [[renderSync]]
 * APIs. Use [[Options]] with [[compile]], [[compileString]], [[compileAsync]],
 * and [[compileStringAsync]] instead.
 */
export type LegacyOptions<sync extends 'sync' | 'async'> =
  | LegacyFileOptions<sync>
  | LegacyStringOptions<sync>;
