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

import { KeycloakAngularModule, KeycloakEventType, 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, ModuleOptions } 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 { MatTooltipModule } from '@angular/material/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';
import { TranslateModule } from '@ngx-translate/core';
import { TenantContext, TenantContextHolder } from '../tenants';
import { filter, firstValueFrom, of, switchMap } from 'rxjs';
import { KeycloakStatus, KeycloakStatusService } from './services/keycloak-status.service';
import { map, tap } from 'rxjs/operators';

function getKeycloakOptions(baseUrl: string, tenantContextHolder: TenantContextHolder, configService: IqserConfigService): KeycloakOptions {
    console.log('keycloak config for: ', tenantContextHolder.currentTenant);
    return {
        config: {
            url: configService.values.OAUTH_URL,
            realm: tenantContextHolder.currentTenant,
            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, keycloakStatusService: KeycloakStatusService) {
    keyCloakService.getKeycloakInstance().onAuthRefreshError = () => {
        keycloakStatusService.createLoginUrlAndExecute();
    };
}

export function keycloakInitializer(
    keycloakService: KeycloakService,
    configService: IqserConfigService,
    baseUrl: string,
    keycloakStatusService: KeycloakStatusService,
    tenantContext: TenantContext,
    tenantContextHolder: TenantContextHolder,
): () => Promise<boolean> {
    const tenantsReady = tenantContext.tenantsReady$.pipe(
        filter(t => t),
        switchMap(() => {
            if (tenantContextHolder.currentTenant) {
                const x = keycloakService.init(getKeycloakOptions(baseUrl, tenantContextHolder, configService));
                configureAutomaticRedirectToLoginScreen(keycloakService, keycloakStatusService);
                keycloakStatusService.updateStatus(KeycloakStatus.PENDING);
                return x;
            } else {
                keycloakStatusService.updateStatus(KeycloakStatus.NOT_ACTIVE);
                return of(true);
            }
        }),
    );

    return () => firstValueFrom(tenantsReady);
}

export function keycloakStatusInitializer(keycloakService: KeycloakService, keycloakStatusService: KeycloakStatusService) {
    const pipe = keycloakStatusService.keycloakStatus$.pipe(
        filter(status => status === KeycloakStatus.PENDING || status === KeycloakStatus.NOT_ACTIVE),
        switchMap(status => {
            if (status === KeycloakStatus.NOT_ACTIVE) {
                return of(true);
            } else {
                return keycloakService.keycloakEvents$.pipe(
                    filter(event => event.type === KeycloakEventType.OnReady),
                    tap(() => keycloakStatusService.updateStatus(KeycloakStatus.READY)),
                    map(() => true),
                );
            }
        }),
    );
    return () => firstValueFrom(pipe);
}

const components = [NamePipe, InitialsAvatarComponent, UserButtonComponent];

@NgModule({
    imports: [KeycloakAngularModule, MatTooltipModule, CommonModule, MatIconModule, MatButtonModule, TranslateModule],
    declarations: [...components],
    exports: [...components],
})
export class IqserUsersModule {
    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 = ModuleOptions.getService(IqserUserService, DefaultUserService, options.existingUserService);
        const roleGuard = ModuleOptions.getService(IqserRoleGuard, IqserRoleGuard, options.existingRoleGuard);

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