/*!
 * @license
 * Copyright 2016 Alfresco Software, Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { Component, EventEmitter, Output, ViewEncapsulation, OnInit, Input } from '@angular/core';
import { Validators, FormGroup, FormBuilder, AbstractControl, FormControl } from '@angular/forms';
import { AppConfigService, AppConfigValues } from '../app-config/app-config.service';
import { StorageService } from '../services/storage.service';
import { AlfrescoApiService } from '../services/alfresco-api.service';
import { OauthConfigModel } from '../models/oauth-config.model';

@Component({
    selector: 'adf-host-settings',
    templateUrl: 'host-settings.component.html',
    host: {
        'class': 'adf-host-settings'
    },
    styleUrls: ['host-settings.component.scss'],
    encapsulation: ViewEncapsulation.None
})
export class HostSettingsComponent implements OnInit {

    HOST_REGEX: string = '^(http|https):\/\/.*[^/]$';

    /**
     * Tells the component which provider options are available. Possible valid values
     * are "ECM" (Content), "BPM" (Process) , "ALL" (Content and Process), 'OAUTH2' SSO.
     */
    @Input()
    providers: string[] = ['BPM', 'ECM', 'ALL'];

    showSelectProviders = true;

    form: FormGroup;

    /** Emitted when the URL is invalid. */
    @Output()
    error = new EventEmitter<string>();

    /** Emitted when the user cancels the changes. */
    @Output()
    cancel = new EventEmitter<boolean>();

    /** Emitted when the changes are successfully applied. */
    @Output()
    success = new EventEmitter<boolean>();

    constructor(private formBuilder: FormBuilder,
                private storageService: StorageService,
                private alfrescoApiService: AlfrescoApiService,
                private appConfig: AppConfigService) {
    }

    ngOnInit() {
        if (this.providers.length === 1) {
            this.showSelectProviders = false;
        }

        let providerSelected = this.appConfig.get<string>(AppConfigValues.PROVIDERS);

        const authType = this.appConfig.get<string>(AppConfigValues.AUTHTYPE, 'BASIC');

        this.form = this.formBuilder.group({
            providersControl: [providerSelected, Validators.required],
            authType: authType
        });

        this.addFormGroups();

        if (authType === 'OAUTH') {
            this.addOAuthFormGroup();
            this.addIdentityHostFormControl();
        }

        this.form.get('authType').valueChanges.subscribe((value) => {
            if (value === 'BASIC') {
                this.form.removeControl('oauthConfig');
                this.form.removeControl('identityHost');
            } else {
                this.addOAuthFormGroup();
                this.addIdentityHostFormControl();
            }
        });

        this.providersControl.valueChanges.subscribe(() => {
            this.removeFormGroups();
            this.addFormGroups();
        });
    }

    private removeFormGroups() {
        this.form.removeControl('bpmHost');
        this.form.removeControl('ecmHost');
    }

    private addFormGroups() {
        this.addBPMFormControl();
        this.addECMFormControl();
    }

    private addOAuthFormGroup() {
        const oauthFormGroup = this.createOAuthFormGroup();
        this.form.addControl('oauthConfig', oauthFormGroup);
    }

    private addBPMFormControl() {
        if ((this.isBPM() || this.isALL() || this.isOAUTH()) && !this.bpmHost) {
            const bpmFormControl = this.createBPMFormControl();
            this.form.addControl('bpmHost', bpmFormControl);
        }
    }

    private addIdentityHostFormControl() {
        const identityHostFormControl = this.createIdentityFormControl();
        this.form.addControl('identityHost', identityHostFormControl);
    }

    private addECMFormControl() {
        if ((this.isECM() || this.isALL()) && !this.ecmHost) {
            const ecmFormControl = this.createECMFormControl();
            this.form.addControl('ecmHost', ecmFormControl);
        }
    }

    private createOAuthFormGroup(): AbstractControl {
        let oauth = <OauthConfigModel> this.appConfig.get(AppConfigValues.OAUTHCONFIG, {});

        return this.formBuilder.group({
            host: [oauth.host, [Validators.required, Validators.pattern(this.HOST_REGEX)]],
            clientId: [oauth.clientId, Validators.required],
            redirectUri: [oauth.redirectUri, Validators.required],
            redirectUriLogout: [oauth.redirectUriLogout],
            scope: [oauth.scope, Validators.required],
            secret: oauth.secret,
            silentLogin: oauth.silentLogin,
            implicitFlow: oauth.implicitFlow
        });
    }

    private createBPMFormControl(): AbstractControl {
        return new FormControl(this.appConfig.get<string>(AppConfigValues.BPMHOST), [Validators.required, Validators.pattern(this.HOST_REGEX)]);
    }

    private createIdentityFormControl(): AbstractControl {
        return new FormControl(this.appConfig.get<string>(AppConfigValues.IDENTITY_HOST), [Validators.required, Validators.pattern(this.HOST_REGEX)]);
    }

    private createECMFormControl(): AbstractControl {
        return new FormControl(this.appConfig.get<string>(AppConfigValues.ECMHOST), [Validators.required, Validators.pattern(this.HOST_REGEX)]);
    }

    onCancel() {
        this.cancel.emit(true);
    }

    onSubmit(values: any) {
        this.storageService.setItem(AppConfigValues.PROVIDERS, values.providersControl);

        if (this.isBPM()) {
            this.saveBPMValues(values);
        } else if (this.isECM()) {
            this.saveECMValues(values);
        } else if (this.isALL()) {
            this.saveECMValues(values);
            this.saveBPMValues(values);
        }

        if (this.isOAUTH()) {
            this.saveOAuthValues(values);
        }

        this.storageService.setItem(AppConfigValues.AUTHTYPE, values.authType);

        this.alfrescoApiService.reset();
        this.alfrescoApiService.getInstance().invalidateSession();
        this.success.emit(true);
    }

    private saveOAuthValues(values: any) {
        this.storageService.setItem(AppConfigValues.OAUTHCONFIG, JSON.stringify(values.oauthConfig));
        this.storageService.setItem(AppConfigValues.IDENTITY_HOST, values.identityHost);
    }

    private saveBPMValues(values: any) {
        this.storageService.setItem(AppConfigValues.BPMHOST, values.bpmHost);
    }

    private saveECMValues(values: any) {
        this.storageService.setItem(AppConfigValues.ECMHOST, values.ecmHost);
    }

    isBPM(): boolean {
        return this.providersControl.value === 'BPM';
    }

    isECM(): boolean {
        return this.providersControl.value === 'ECM';
    }

    isALL(): boolean {
        return this.providersControl.value === 'ALL';
    }

    isOAUTH(): boolean {
        return this.form.get('authType').value === 'OAUTH';
    }

    get providersControl(): AbstractControl {
        return this.form.get('providersControl');
    }

    get bpmHost(): AbstractControl {
        return this.form.get('bpmHost');
    }

    get ecmHost(): AbstractControl {
        return this.form.get('ecmHost');
    }

    get host(): AbstractControl {
        return this.oauthConfig.get('host');
    }

    get identityHost(): AbstractControl {
        return this.form.get('identityHost');
    }

    get clientId(): AbstractControl {
        return this.oauthConfig.get('clientId');
    }

    get scope(): AbstractControl {
        return this.oauthConfig.get('scope');
    }

    get secretId(): AbstractControl {
        return this.oauthConfig.get('secretId');
    }

    get implicitFlow(): AbstractControl {
        return this.oauthConfig.get('implicitFlow');
    }

    get silentLogin(): AbstractControl {
        return this.oauthConfig.get('silentLogin');
    }

    get redirectUri(): AbstractControl {
        return this.oauthConfig.get('redirectUri');
    }

    get redirectUriLogout(): AbstractControl {
        return this.oauthConfig.get('redirectUriLogout');
    }

    get oauthConfig(): AbstractControl {
        return this.form.get('oauthConfig');
    }

}