import { DOCUMENT } from '@angular/common';
import {
    Inject,
    Injectable,
    Optional,
} from '@angular/core';

import {
    SemverInterface,
} from './../../../models/index';

@Injectable()
export class AddIOSVersionClassService {
    constructor(
        @Inject(DOCUMENT)
        private _document: Document,
        @Optional()
        @Inject('currentIOSVersion')
        private _currentIOSVersion: SemverInterface,
    ) {}

    public addIOSVersionClass() {
        if (this._currentIOSVersion) {
            this._document.body.classList.add(
                `u-ios-${this._currentIOSVersion.major}`,
            );
        }
    }
}