/**
 * @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 { DOCUMENT, ɵgetDOM as getDOM } from '@angular/common';
import { Inject, Injectable, ɵɵinject } from '@angular/core';
import * as i0 from "@angular/core";
/**
 * Factory to create a `Meta` service instance for the current DOM document.
 */
export function createMeta() {
    return new Meta(ɵɵinject(DOCUMENT));
}
/**
 * A service for managing HTML `<meta>` tags.
 *
 * Properties of the `MetaDefinition` object match the attributes of the
 * HTML `<meta>` tag. These tags define document metadata that is important for
 * things like configuring a Content Security Policy, defining browser compatibility
 * and security settings, setting HTTP Headers, defining rich content for social sharing,
 * and Search Engine Optimization (SEO).
 *
 * To identify specific `<meta>` tags in a document, use an attribute selection
 * string in the format `"tag_attribute='value string'"`.
 * For example, an `attrSelector` value of `"name='description'"` matches a tag
 * whose `name` attribute has the value `"description"`.
 * Selectors are used with the `querySelector()` Document method,
 * in the format `meta[{attrSelector}]`.
 *
 * @see [HTML meta tag](https://developer.mozilla.org/docs/Web/HTML/Element/meta)
 * @see [Document.querySelector()](https://developer.mozilla.org/docs/Web/API/Document/querySelector)
 *
 *
 * @publicApi
 */
export class Meta {
    constructor(_doc) {
        this._doc = _doc;
        this._dom = getDOM();
    }
    /**
     * Retrieves or creates a specific `<meta>` tag element in the current HTML document.
     * In searching for an existing tag, Angular attempts to match the `name` or `property` attribute
     * values in the provided tag definition, and verifies that all other attribute values are equal.
     * If an existing element is found, it is returned and is not modified in any way.
     * @param tag The definition of a `<meta>` element to match or create.
     * @param forceCreation True to create a new element without checking whether one already exists.
     * @returns The existing element with the same attributes and values if found,
     * the new element if no match is found, or `null` if the tag parameter is not defined.
     */
    addTag(tag, forceCreation = false) {
        if (!tag)
            return null;
        return this._getOrCreateElement(tag, forceCreation);
    }
    /**
     * Retrieves or creates a set of `<meta>` tag elements in the current HTML document.
     * In searching for an existing tag, Angular attempts to match the `name` or `property` attribute
     * values in the provided tag definition, and verifies that all other attribute values are equal.
     * @param tags An array of tag definitions to match or create.
     * @param forceCreation True to create new elements without checking whether they already exist.
     * @returns The matching elements if found, or the new elements.
     */
    addTags(tags, forceCreation = false) {
        if (!tags)
            return [];
        return tags.reduce((result, tag) => {
            if (tag) {
                result.push(this._getOrCreateElement(tag, forceCreation));
            }
            return result;
        }, []);
    }
    /**
     * Retrieves a `<meta>` tag element in the current HTML document.
     * @param attrSelector The tag attribute and value to match against, in the format
     * `"tag_attribute='value string'"`.
     * @returns The matching element, if any.
     */
    getTag(attrSelector) {
        if (!attrSelector)
            return null;
        return this._doc.querySelector(`meta[${attrSelector}]`) || null;
    }
    /**
     * Retrieves a set of `<meta>` tag elements in the current HTML document.
     * @param attrSelector The tag attribute and value to match against, in the format
     * `"tag_attribute='value string'"`.
     * @returns The matching elements, if any.
     */
    getTags(attrSelector) {
        if (!attrSelector)
            return [];
        const list /*NodeList*/ = this._doc.querySelectorAll(`meta[${attrSelector}]`);
        return list ? [].slice.call(list) : [];
    }
    /**
     * Modifies an existing `<meta>` tag element in the current HTML document.
     * @param tag The tag description with which to replace the existing tag content.
     * @param selector A tag attribute and value to match against, to identify
     * an existing tag. A string in the format `"tag_attribute=`value string`"`.
     * If not supplied, matches a tag with the same `name` or `property` attribute value as the
     * replacement tag.
     * @return The modified element.
     */
    updateTag(tag, selector) {
        if (!tag)
            return null;
        selector = selector || this._parseSelector(tag);
        const meta = this.getTag(selector);
        if (meta) {
            return this._setMetaElementAttributes(tag, meta);
        }
        return this._getOrCreateElement(tag, true);
    }
    /**
     * Removes an existing `<meta>` tag element from the current HTML document.
     * @param attrSelector A tag attribute and value to match against, to identify
     * an existing tag. A string in the format `"tag_attribute=`value string`"`.
     */
    removeTag(attrSelector) {
        this.removeTagElement(this.getTag(attrSelector));
    }
    /**
     * Removes an existing `<meta>` tag element from the current HTML document.
     * @param meta The tag definition to match against to identify an existing tag.
     */
    removeTagElement(meta) {
        if (meta) {
            this._dom.remove(meta);
        }
    }
    _getOrCreateElement(meta, forceCreation = false) {
        if (!forceCreation) {
            const selector = this._parseSelector(meta);
            // It's allowed to have multiple elements with the same name so it's not enough to
            // just check that element with the same name already present on the page. We also need to
            // check if element has tag attributes
            const elem = this.getTags(selector).filter(elem => this._containsAttributes(meta, elem))[0];
            if (elem !== undefined)
                return elem;
        }
        const element = this._dom.createElement('meta');
        this._setMetaElementAttributes(meta, element);
        const head = this._doc.getElementsByTagName('head')[0];
        head.appendChild(element);
        return element;
    }
    _setMetaElementAttributes(tag, el) {
        Object.keys(tag).forEach((prop) => el.setAttribute(this._getMetaKeyMap(prop), tag[prop]));
        return el;
    }
    _parseSelector(tag) {
        const attr = tag.name ? 'name' : 'property';
        return `${attr}="${tag[attr]}"`;
    }
    _containsAttributes(tag, elem) {
        return Object.keys(tag).every((key) => elem.getAttribute(this._getMetaKeyMap(key)) === tag[key]);
    }
    _getMetaKeyMap(prop) {
        return META_KEYS_MAP[prop] || prop;
    }
    static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.2.12", ngImport: i0, type: Meta, deps: [{ token: DOCUMENT }], target: i0.ɵɵFactoryTarget.Injectable }); }
    static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.2.12", ngImport: i0, type: Meta, providedIn: 'root', useFactory: createMeta, deps: [] }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.2.12", ngImport: i0, type: Meta, decorators: [{
            type: Injectable,
            args: [{ providedIn: 'root', useFactory: createMeta, deps: [] }]
        }], ctorParameters: function () { return [{ type: undefined, decorators: [{
                    type: Inject,
                    args: [DOCUMENT]
                }] }]; } });
/**
 * Mapping for MetaDefinition properties with their correct meta attribute names
 */
const META_KEYS_MAP = {
    httpEquiv: 'http-equiv'
};
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The element itself is\n * represented by the internal `HTMLMetaElement`.\n *\n * @see [HTML meta tag](https://developer.mozilla.org/docs/Web/HTML/Element/meta)\n * @see {@link Meta}\n *\n * @publicApi\n */\nexport type MetaDefinition = {\n  charset?: string;\n  content?: string;\n  httpEquiv?: string;\n  id?: string;\n  itemprop?: string;\n  name?: string;\n  property?: string;\n  scheme?: string;\n  url?: string;\n}&{\n  // TODO(IgorMinar): this type looks wrong\n  [prop: string]: string;\n};\n\n/**\n * Factory to create a `Meta` service instance for the current DOM document.\n */\nexport function createMeta() {\n  return new Meta(ɵɵinject(DOCUMENT));\n}\n\n/**\n * A service for managing HTML `<meta>` tags.\n *\n * Properties of the `MetaDefinition` object match the attributes of the\n * HTML `<meta>` tag. These tags define document metadata that is important for\n * things like configuring a Content Security Policy, defining browser compatibility\n * and security settings, setting HTTP Headers, defining rich content for social sharing,\n * and Search Engine Optimization (SEO).\n *\n * To identify specific `<meta>` tags in a document, use an attribute selection\n * string in the format `\"tag_attribute='value string'\"`.\n * For example, an `attrSelector` value of `\"name='description'\"` matches a tag\n * whose `name` attribute has the value `\"description\"`.\n * Selectors are used with the `querySelector()` Document method,\n * in the format `meta[{attrSelector}]`.\n *\n * @see [HTML meta tag](https://developer.mozilla.org/docs/Web/HTML/Element/meta)\n * @see [Document.querySelector()](https://developer.mozilla.org/docs/Web/API/Document/querySelector)\n *\n *\n * @publicApi\n */\n@Injectable({providedIn: 'root', useFactory: createMeta, deps: []})\nexport class Meta {\n  private _dom: DomAdapter;\n  constructor(@Inject(DOCUMENT) private _doc: any) {\n    this._dom = getDOM();\n  }\n  /**\n   * Retrieves or creates a specific `<meta>` tag element in the current HTML document.\n   * In searching for an existing tag, Angular attempts to match the `name` or `property` attribute\n   * values in the provided tag definition, and verifies that all other attribute values are equal.\n   * If an existing element is found, it is returned and is not modified in any way.\n   * @param tag The definition of a `<meta>` element to match or create.\n   * @param forceCreation True to create a new element without checking whether one already exists.\n   * @returns The existing element with the same attributes and values if found,\n   * the new element if no match is found, or `null` if the tag parameter is not defined.\n   */\n  addTag(tag: MetaDefinition, forceCreation: boolean = false): HTMLMetaElement|null {\n    if (!tag) return null;\n    return this._getOrCreateElement(tag, forceCreation);\n  }\n\n  /**\n   * Retrieves or creates a set of `<meta>` tag elements in the current HTML document.\n   * In searching for an existing tag, Angular attempts to match the `name` or `property` attribute\n   * values in the provided tag definition, and verifies that all other attribute values are equal.\n   * @param tags An array of tag definitions to match or create.\n   * @param forceCreation True to create new elements without checking whether they already exist.\n   * @returns The matching elements if found, or the new elements.\n   */\n  addTags(tags: MetaDefinition[], forceCreation: boolean = false): HTMLMetaElement[] {\n    if (!tags) return [];\n    return tags.reduce((result: HTMLMetaElement[], tag: MetaDefinition) => {\n      if (tag) {\n        result.push(this._getOrCreateElement(tag, forceCreation));\n      }\n      return result;\n    }, []);\n  }\n\n  /**\n   * Retrieves a `<meta>` tag element in the current HTML document.\n   * @param attrSelector The tag attribute and value to match against, in the format\n   * `\"tag_attribute='value string'\"`.\n   * @returns The matching element, if any.\n   */\n  getTag(attrSelector: string): HTMLMetaElement|null {\n    if (!attrSelector) return null;\n    return this._doc.querySelector(`meta[${attrSelector}]`) || null;\n  }\n\n  /**\n   * Retrieves a set of `<meta>` tag elements in the current HTML document.\n   * @param attrSelector The tag attribute and value to match against, in the format\n   * `\"tag_attribute='value string'\"`.\n   * @returns The matching elements, if any.\n   */\n  getTags(attrSelector: string): HTMLMetaElement[] {\n    if (!attrSelector) return [];\n    const list /*NodeList*/ = this._doc.querySelectorAll(`meta[${attrSelector}]`);\n    return list ? [].slice.call(list) : [];\n  }\n\n  /**\n   * Modifies an existing `<meta>` tag element in the current HTML document.\n   * @param tag The tag description with which to replace the existing tag content.\n   * @param selector A tag attribute and value to match against, to identify\n   * an existing tag. A string in the format `\"tag_attribute=`value string`\"`.\n   * If not supplied, matches a tag with the same `name` or `property` attribute value as the\n   * replacement tag.\n   * @return The modified element.\n   */\n  updateTag(tag: MetaDefinition, selector?: string): HTMLMetaElement|null {\n    if (!tag) return null;\n    selector = selector || this._parseSelector(tag);\n    const meta: HTMLMetaElement = this.getTag(selector)!;\n    if (meta) {\n      return this._setMetaElementAttributes(tag, meta);\n    }\n    return this._getOrCreateElement(tag, true);\n  }\n\n  /**\n   * Removes an existing `<meta>` tag element from the current HTML document.\n   * @param attrSelector A tag attribute and value to match against, to identify\n   * an existing tag. A string in the format `\"tag_attribute=`value string`\"`.\n   */\n  removeTag(attrSelector: string): void {\n    this.removeTagElement(this.getTag(attrSelector)!);\n  }\n\n  /**\n   * Removes an existing `<meta>` tag element from the current HTML document.\n   * @param meta The tag definition to match against to identify an existing tag.\n   */\n  removeTagElement(meta: HTMLMetaElement): void {\n    if (meta) {\n      this._dom.remove(meta);\n    }\n  }\n\n  private _getOrCreateElement(meta: MetaDefinition, forceCreation: boolean = false):\n      HTMLMetaElement {\n    if (!forceCreation) {\n      const selector: string = this._parseSelector(meta);\n      // It's allowed to have multiple elements with the same name so it's not enough to\n      // just check that element with the same name already present on the page. We also need to\n      // check if element has tag attributes\n      const elem = this.getTags(selector).filter(elem => this._containsAttributes(meta, elem))[0];\n      if (elem !== undefined) return elem;\n    }\n    const element: HTMLMetaElement = this._dom.createElement('meta') as HTMLMetaElement;\n    this._setMetaElementAttributes(meta, element);\n    const head = this._doc.getElementsByTagName('head')[0];\n    head.appendChild(element);\n    return element;\n  }\n\n  private _setMetaElementAttributes(tag: MetaDefinition, el: HTMLMetaElement): HTMLMetaElement {\n    Object.keys(tag).forEach(\n        (prop: string) => el.setAttribute(this._getMetaKeyMap(prop), tag[prop]));\n    return el;\n  }\n\n  private _parseSelector(tag: MetaDefinition): string {\n    const attr: string = tag.name ? 'name' : 'property';\n    return `${attr}=\"${tag[attr]}\"`;\n  }\n\n  private _containsAttributes(tag: MetaDefinition, elem: HTMLMetaElement): boolean {\n    return Object.keys(tag).every(\n        (key: string) => elem.getAttribute(this._getMetaKeyMap(key)) === tag[key]);\n  }\n\n  private _getMetaKeyMap(prop: string): string {\n    return META_KEYS_MAP[prop] || prop;\n  }\n}\n\n/**\n * Mapping for MetaDefinition properties with their correct meta attribute names\n */\nconst META_KEYS_MAP: {[prop: string]: string;} = {\n  httpEquiv: 'http-equiv'\n};\n"]}