// Type definitions for csso 5.0
// Project: https://github.com/css/csso
// Definitions by: Christian Rackerseder <https://github.com/screendriver>
//                 Erik Källén <https://github.com/erik-kallen>
//                 Piotr Błażejewicz <https://github.com/peterblazejewicz>
// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
import * as csstree from 'css-tree';

export as namespace csso;
export const version: string;
/**
 * Minify source CSS passed as String
 * @param source
 * @param options
 */
export function minify(source: string, options?: MinifyOptions & CompressOptions): Result;

/**
 * The same as minify() but for list of declarations. Usually it's a style attribute value.
 * @param source
 * @param options
 */
export function minifyBlock(source: string, options?: MinifyOptions & CompressOptions): Result;

export const syntax: typeof csstree & {
    /**
     * Does the main task – compress an AST.
     */
    compress(ast: csstree.CssNode, options?: CompressOptions): { ast: csstree.CssNode };
};

export interface Result {
    /**
     * Resulting CSS.
     */
    css: string;
    /**
     * Instance of SourceMapGenerator or null.
     */
    map: object | null;
}

export interface Usage {
    tags?: string[] | undefined;
    ids?: string[] | undefined;
    classes?: string[] | undefined;
    scopes?: string[][] | undefined;
    blacklist?:
        | {
              tags?: string[] | undefined;
              ids?: string[] | undefined;
              classes?: string[] | undefined;
          }
        | undefined;
}

export interface CompressOptions {
    /**
     * Disable or enable a structure optimisations.
     * @default true
     */
    restructure?: boolean | undefined;
    /**
     * Enables merging of @media rules with the same media query by splitted by other rules.
     * The optimisation is unsafe in general, but should work fine in most cases. Use it on your own risk.
     * @default false
     */
    forceMediaMerge?: boolean | undefined;
    /**
     * Transform a copy of input AST if true. Useful in case of AST reuse.
     * @default false
     */
    clone?: boolean | undefined;
    /**
     * Specify what comments to leave:
     * - 'exclamation' or true – leave all exclamation comments
     * - 'first-exclamation' – remove every comment except first one
     * - false – remove all comments
     * @default true
     */
    comments?: string | boolean | undefined;
    /**
     * Usage data for advanced optimisations.
     */
    usage?: Usage | undefined;
    /**
     * Function to track every step of transformation.
     */
    logger?: (() => void) | undefined;
}

export interface MinifyOptions {
    /**
     * Generate a source map when true.
     * @default false
     */
    sourceMap?: boolean | undefined;
    /**
     * Filename of input CSS, uses for source map generation.
     * @default '<unknown>'
     */
    filename?: string | undefined;
    /**
     * Output debug information to stderr.
     * @default false
     */
    debug?: boolean | undefined;
    /**
     * Called right after parse is run.
     */
    beforeCompress?: BeforeCompressFn | BeforeCompressFn[] | undefined;
    /**
     * Called right after compress() is run.
     */
    afterCompress?: AfterCompressFn | AfterCompressFn[] | undefined;
    restructure?: boolean | undefined;
}

export type BeforeCompressFn = (ast: object, options: CompressOptions) => void;
export type AfterCompressFn = (compressResult: string, options: CompressOptions) => void;