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import path from 'path';
import util from 'util';

import glob from 'glob';

import type {LoaderContext, StyleResourcesLoaderNormalizedOptions} from '../types';

import {isStyleFile} from './type-guards';

/* eslint-disable-next-line @typescript-eslint/no-unsafe-member-access */
const isLegacyWebpack = (ctx: any): ctx is {options: {context: string}} => !!ctx.options;

const getRootContext = (ctx: LoaderContext) => {
    /* istanbul ignore if: will be deprecated soon */
    if (isLegacyWebpack(ctx)) {
        return ctx.options.context;
    }

    return ctx.rootContext;
};

const flatten = <T>(items: T[][]) => {
    const emptyItems: T[] = [];

    return emptyItems.concat(...items);
};

export const matchFiles = async (ctx: LoaderContext, options: StyleResourcesLoaderNormalizedOptions) => {
    const {patterns, globOptions} = options;

    const files = await Promise.all(
        patterns.map(async pattern => {
            const rootContext = getRootContext(ctx);
            const absolutePattern = path.isAbsolute(pattern) ? pattern : path.resolve(rootContext, pattern);
            const partialFiles = await util.promisify(glob)(absolutePattern, globOptions);

            return partialFiles.filter(isStyleFile);
        }),
    );

    /**
     * Glob always returns Unix-style file paths which would have cache invalidation problems on Windows.
     * Use `path.resolve()` to convert Unix-style file paths to system-compatible ones.
     *
     * @see {@link https://github.com/yenshih/style-resources-loader/issues/17}
     */
    return [...new Set(flatten(files))].map(file => path.resolve(file));
};