/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { EventEmitter, Inject, Injectable, Optional } from '@angular/core';
import { DIR_DOCUMENT } from './dir-document-token';
import * as i0 from "@angular/core";
/** Regex that matches locales with an RTL script. Taken from `goog.i18n.bidi.isRtlLanguage`. */
const RTL_LOCALE_PATTERN = /^(ar|ckb|dv|he|iw|fa|nqo|ps|sd|ug|ur|yi|.*[-_](Adlm|Arab|Hebr|Nkoo|Rohg|Thaa))(?!.*[-_](Latn|Cyrl)($|-|_))($|-|_)/i;
/** Resolves a string value to a specific direction. */
export function _resolveDirectionality(rawValue) {
    const value = rawValue?.toLowerCase() || '';
    if (value === 'auto' && typeof navigator !== 'undefined' && navigator?.language) {
        return RTL_LOCALE_PATTERN.test(navigator.language) ? 'rtl' : 'ltr';
    }
    return value === 'rtl' ? 'rtl' : 'ltr';
}
/**
 * The directionality (LTR / RTL) context for the application (or a subtree of it).
 * Exposes the current direction and a stream of direction changes.
 */
export class Directionality {
    constructor(_document) {
        /** The current 'ltr' or 'rtl' value. */
        this.value = 'ltr';
        /** Stream that emits whenever the 'ltr' / 'rtl' state changes. */
        this.change = new EventEmitter();
        if (_document) {
            const bodyDir = _document.body ? _document.body.dir : null;
            const htmlDir = _document.documentElement ? _document.documentElement.dir : null;
            this.value = _resolveDirectionality(bodyDir || htmlDir || 'ltr');
        }
    }
    ngOnDestroy() {
        this.change.complete();
    }
    static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: Directionality, deps: [{ token: DIR_DOCUMENT, optional: true }], target: i0.ɵɵFactoryTarget.Injectable }); }
    static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: Directionality, providedIn: 'root' }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: Directionality, decorators: [{
            type: Injectable,
            args: [{ providedIn: 'root' }]
        }], ctorParameters: function () { return [{ type: undefined, decorators: [{
                    type: Optional
                }, {
                    type: Inject,
                    args: [DIR_DOCUMENT]
                }] }]; } });
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