import { APP_INITIALIZER, ModuleWithProviders, NgModule } from '@angular/core';

import { KeycloakAngularModule, KeycloakOptions, KeycloakService } from 'keycloak-angular';
import { DefaultUserService } from './services/default-user.service';
import { IIqserUser } from './types/user.response';
import { IqserUserService } from './services/iqser-user.service';
import { BASE_HREF, ModuleWithOptions } from '../utils';
import { IqserUsersModuleOptions } from './types/iqser-users-module-options';
import { IqserUser } from './iqser-user.model';
import { IqserRoleGuard } from './guards/iqser-role-guard.service';
import { IqserAuthGuard } from './guards/iqser-auth-guard.service';
import { IqserConfigService } from '../services';
import { NamePipe } from './name.pipe';
import { InitialsAvatarComponent } from './components/initials-avatar/initials-avatar.component';
import { MatLegacyTooltipModule as MatTooltipModule } from '@angular/material/legacy-tooltip';
import { CommonModule } from '@angular/common';
import { UserButtonComponent } from './components/user-button/user-button.component';
import { MatIconModule } from '@angular/material/icon';
import { MatLegacyButtonModule as MatButtonModule } from '@angular/material/legacy-button';

function getKeycloakOptions(baseUrl: string, configService: IqserConfigService): KeycloakOptions {
    let url: string = configService.values.OAUTH_URL;
    url = url.replace(/\/$/, ''); // remove trailing slash
    const realm = url.substring(url.lastIndexOf('/') + 1, url.length);
    url = url.substring(0, url.lastIndexOf('/realms'));
    return {
        config: {
            url: url,
            realm: realm,
            clientId: configService.values.OAUTH_CLIENT_ID,
        },
        initOptions: {
            checkLoginIframe: false,
            onLoad: 'check-sso',
            silentCheckSsoRedirectUri: window.location.origin + baseUrl + '/assets/oauth/silent-refresh.html',
            flow: 'standard',
        },
        enableBearerInterceptor: true,
    };
}

function configureAutomaticRedirectToLoginScreen(keyCloakService: KeycloakService, configService: IqserConfigService) {
    keyCloakService.getKeycloakInstance().onAuthRefreshError = () => {
        window.location.href = keyCloakService.getKeycloakInstance().createLoginUrl({
            redirectUri: window.location.href,
            idpHint: configService.values.OAUTH_IDP_HINT,
        });
    };
}

export function keycloakInitializer(
    keycloakService: KeycloakService,
    configService: IqserConfigService,
    baseUrl: string,
): () => Promise<void> {
    const x = keycloakService.init(getKeycloakOptions(baseUrl, configService));
    return () => x.then(() => configureAutomaticRedirectToLoginScreen(keycloakService, configService));
}

const components = [NamePipe, InitialsAvatarComponent, UserButtonComponent];

@NgModule({
    imports: [KeycloakAngularModule, MatTooltipModule, CommonModule, MatIconModule, MatButtonModule],
    declarations: [...components],
    exports: [...components],
})
export class IqserUsersModule extends ModuleWithOptions {
    static forRoot<
        Interface extends IIqserUser,
        Class extends IqserUser & Interface,
        UserService extends IqserUserService<Interface, Class>,
        RolesGuard extends IqserRoleGuard = IqserRoleGuard,
    >(options: IqserUsersModuleOptions<Interface, Class, UserService, RolesGuard>): ModuleWithProviders<IqserUsersModule> {
        const userService = this._getService(IqserUserService, DefaultUserService, options.existingUserService);
        const roleGuard = this._getService(IqserRoleGuard, IqserRoleGuard, options.existingRoleGuard);

        return {
            ngModule: IqserUsersModule,
            providers: [
                userService,
                roleGuard,
                IqserAuthGuard,
                {
                    provide: APP_INITIALIZER,
                    useFactory: keycloakInitializer,
                    multi: true,
                    deps: [KeycloakService, IqserConfigService, BASE_HREF],
                },
            ],
        };
    }
}