/**
 * @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 { inject, Inject, Injectable } from '@angular/core';
import { BreakpointObserver } from '@angular/cdk/layout';
import { Platform } from '@angular/cdk/platform';
import { DOCUMENT } from '@angular/common';
import * as i0 from "@angular/core";
import * as i1 from "@angular/cdk/platform";
/** CSS class applied to the document body when in black-on-white high-contrast mode. */
export const BLACK_ON_WHITE_CSS_CLASS = 'cdk-high-contrast-black-on-white';
/** CSS class applied to the document body when in white-on-black high-contrast mode. */
export const WHITE_ON_BLACK_CSS_CLASS = 'cdk-high-contrast-white-on-black';
/** CSS class applied to the document body when in high-contrast mode. */
export const HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS = 'cdk-high-contrast-active';
/**
 * Service to determine whether the browser is currently in a high-contrast-mode environment.
 *
 * Microsoft Windows supports an accessibility feature called "High Contrast Mode". This mode
 * changes the appearance of all applications, including web applications, to dramatically increase
 * contrast.
 *
 * IE, Edge, and Firefox currently support this mode. Chrome does not support Windows High Contrast
 * Mode. This service does not detect high-contrast mode as added by the Chrome "High Contrast"
 * browser extension.
 */
export class HighContrastModeDetector {
    constructor(_platform, document) {
        this._platform = _platform;
        this._document = document;
        this._breakpointSubscription = inject(BreakpointObserver)
            .observe('(forced-colors: active)')
            .subscribe(() => {
            if (this._hasCheckedHighContrastMode) {
                this._hasCheckedHighContrastMode = false;
                this._applyBodyHighContrastModeCssClasses();
            }
        });
    }
    /** Gets the current high-contrast-mode for the page. */
    getHighContrastMode() {
        if (!this._platform.isBrowser) {
            return 0 /* HighContrastMode.NONE */;
        }
        // Create a test element with an arbitrary background-color that is neither black nor
        // white; high-contrast mode will coerce the color to either black or white. Also ensure that
        // appending the test element to the DOM does not affect layout by absolutely positioning it
        const testElement = this._document.createElement('div');
        testElement.style.backgroundColor = 'rgb(1,2,3)';
        testElement.style.position = 'absolute';
        this._document.body.appendChild(testElement);
        // Get the computed style for the background color, collapsing spaces to normalize between
        // browsers. Once we get this color, we no longer need the test element. Access the `window`
        // via the document so we can fake it in tests. Note that we have extra null checks, because
        // this logic will likely run during app bootstrap and throwing can break the entire app.
        const documentWindow = this._document.defaultView || window;
        const computedStyle = documentWindow && documentWindow.getComputedStyle
            ? documentWindow.getComputedStyle(testElement)
            : null;
        const computedColor = ((computedStyle && computedStyle.backgroundColor) || '').replace(/ /g, '');
        testElement.remove();
        switch (computedColor) {
            // Pre Windows 11 dark theme.
            case 'rgb(0,0,0)':
            // Windows 11 dark themes.
            case 'rgb(45,50,54)':
            case 'rgb(32,32,32)':
                return 2 /* HighContrastMode.WHITE_ON_BLACK */;
            // Pre Windows 11 light theme.
            case 'rgb(255,255,255)':
            // Windows 11 light theme.
            case 'rgb(255,250,239)':
                return 1 /* HighContrastMode.BLACK_ON_WHITE */;
        }
        return 0 /* HighContrastMode.NONE */;
    }
    ngOnDestroy() {
        this._breakpointSubscription.unsubscribe();
    }
    /** Applies CSS classes indicating high-contrast mode to document body (browser-only). */
    _applyBodyHighContrastModeCssClasses() {
        if (!this._hasCheckedHighContrastMode && this._platform.isBrowser && this._document.body) {
            const bodyClasses = this._document.body.classList;
            bodyClasses.remove(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS, BLACK_ON_WHITE_CSS_CLASS, WHITE_ON_BLACK_CSS_CLASS);
            this._hasCheckedHighContrastMode = true;
            const mode = this.getHighContrastMode();
            if (mode === 1 /* HighContrastMode.BLACK_ON_WHITE */) {
                bodyClasses.add(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS, BLACK_ON_WHITE_CSS_CLASS);
            }
            else if (mode === 2 /* HighContrastMode.WHITE_ON_BLACK */) {
                bodyClasses.add(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS, WHITE_ON_BLACK_CSS_CLASS);
            }
        }
    }
    static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: HighContrastModeDetector, deps: [{ token: i1.Platform }, { token: DOCUMENT }], target: i0.ɵɵFactoryTarget.Injectable }); }
    static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: HighContrastModeDetector, providedIn: 'root' }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: HighContrastModeDetector, decorators: [{
            type: Injectable,
            args: [{ providedIn: 'root' }]
        }], ctorParameters: function () { return [{ type: i1.Platform }, { type: undefined, decorators: [{
                    type: Inject,
                    args: [DOCUMENT]
                }] }]; } });
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This mode\n * changes the appearance of all applications, including web applications, to dramatically increase\n * contrast.\n *\n * IE, Edge, and Firefox currently support this mode. Chrome does not support Windows High Contrast\n * Mode. This service does not detect high-contrast mode as added by the Chrome \"High Contrast\"\n * browser extension.\n */\n@Injectable({providedIn: 'root'})\nexport class HighContrastModeDetector implements OnDestroy {\n  /**\n   * Figuring out the high contrast mode and adding the body classes can cause\n   * some expensive layouts. This flag is used to ensure that we only do it once.\n   */\n  private _hasCheckedHighContrastMode: boolean;\n  private _document: Document;\n  private _breakpointSubscription: Subscription;\n\n  constructor(private _platform: Platform, @Inject(DOCUMENT) document: any) {\n    this._document = document;\n\n    this._breakpointSubscription = inject(BreakpointObserver)\n      .observe('(forced-colors: active)')\n      .subscribe(() => {\n        if (this._hasCheckedHighContrastMode) {\n          this._hasCheckedHighContrastMode = false;\n          this._applyBodyHighContrastModeCssClasses();\n        }\n      });\n  }\n\n  /** Gets the current high-contrast-mode for the page. */\n  getHighContrastMode(): HighContrastMode {\n    if (!this._platform.isBrowser) {\n      return HighContrastMode.NONE;\n    }\n\n    // Create a test element with an arbitrary background-color that is neither black nor\n    // white; high-contrast mode will coerce the color to either black or white. Also ensure that\n    // appending the test element to the DOM does not affect layout by absolutely positioning it\n    const testElement = this._document.createElement('div');\n    testElement.style.backgroundColor = 'rgb(1,2,3)';\n    testElement.style.position = 'absolute';\n    this._document.body.appendChild(testElement);\n\n    // Get the computed style for the background color, collapsing spaces to normalize between\n    // browsers. Once we get this color, we no longer need the test element. Access the `window`\n    // via the document so we can fake it in tests. Note that we have extra null checks, because\n    // this logic will likely run during app bootstrap and throwing can break the entire app.\n    const documentWindow = this._document.defaultView || window;\n    const computedStyle =\n      documentWindow && documentWindow.getComputedStyle\n        ? documentWindow.getComputedStyle(testElement)\n        : null;\n    const computedColor = ((computedStyle && computedStyle.backgroundColor) || '').replace(\n      / /g,\n      '',\n    );\n    testElement.remove();\n\n    switch (computedColor) {\n      // Pre Windows 11 dark theme.\n      case 'rgb(0,0,0)':\n      // Windows 11 dark themes.\n      case 'rgb(45,50,54)':\n      case 'rgb(32,32,32)':\n        return HighContrastMode.WHITE_ON_BLACK;\n      // Pre Windows 11 light theme.\n      case 'rgb(255,255,255)':\n      // Windows 11 light theme.\n      case 'rgb(255,250,239)':\n        return HighContrastMode.BLACK_ON_WHITE;\n    }\n    return HighContrastMode.NONE;\n  }\n\n  ngOnDestroy(): void {\n    this._breakpointSubscription.unsubscribe();\n  }\n\n  /** Applies CSS classes indicating high-contrast mode to document body (browser-only). */\n  _applyBodyHighContrastModeCssClasses(): void {\n    if (!this._hasCheckedHighContrastMode && this._platform.isBrowser && this._document.body) {\n      const bodyClasses = this._document.body.classList;\n      bodyClasses.remove(\n        HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS,\n        BLACK_ON_WHITE_CSS_CLASS,\n        WHITE_ON_BLACK_CSS_CLASS,\n      );\n      this._hasCheckedHighContrastMode = true;\n\n      const mode = this.getHighContrastMode();\n      if (mode === HighContrastMode.BLACK_ON_WHITE) {\n        bodyClasses.add(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS, BLACK_ON_WHITE_CSS_CLASS);\n      } else if (mode === HighContrastMode.WHITE_ON_BLACK) {\n        bodyClasses.add(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS, WHITE_ON_BLACK_CSS_CLASS);\n      }\n    }\n  }\n}\n"]}