import { ChangeDetectionStrategy, Component, inject, Input } from '@angular/core';
import { FormBuilder, Validators } from '@angular/forms';
import { TenantsService } from '../services';
import { LoadingService } from '../../loading';
import { Title } from '@angular/platform-browser';
import { getConfig } from '../../services';
import { KeycloakService } from 'keycloak-angular';
import { BASE_HREF } from '../../utils';
import { getKeycloakOptions } from '../keycloak-initializer';
import { KeycloakStatusService } from '../services/keycloak-status.service';

@Component({
    templateUrl: './tenant-select.component.html',
    styleUrls: ['./tenant-select.component.scss'],
    changeDetection: ChangeDetectionStrategy.OnPush,
})
export class TenantSelectComponent {
    protected readonly baseHref = inject(BASE_HREF);
    protected readonly storedTenants = inject(TenantsService)
        .getStoredTenants()
        .sort((a, b) => a.tenantId.localeCompare(b.tenantId));
    protected readonly titleService = inject(Title);
    protected readonly config = getConfig();
    protected readonly loadingService = inject(LoadingService);
    protected readonly keycloakService = inject(KeycloakService);
    protected readonly keycloakStatusService = inject(KeycloakStatusService);
    protected readonly form = inject(FormBuilder).group({
        // eslint-disable-next-line @typescript-eslint/unbound-method
        tenantId: ['', Validators.required],
    });
    @Input() isLoggedOut = false;

    updateTenantSelection() {
        const tenantId = this.form.controls.tenantId.value;
        if (!tenantId) {
            throw new Error('No tenant selected!');
        }

        this.loadingService.start();

        const email = this.#getEmail(tenantId);
        return this.select(tenantId, email);
    }

    async select(tenantId: string, email?: string) {
        try {
            await this.keycloakService.init(getKeycloakOptions(this.baseHref, this.config, tenantId));
        } catch (e) {
            return this.keycloakService.logout();
        }
        const url = this.keycloakService.getKeycloakInstance().createLoginUrl({
            redirectUri: this.keycloakStatusService.createLoginUrl(tenantId),
            idpHint: this.config.OAUTH_IDP_HINT,
            loginHint: email ?? undefined,
        });
        return this.keycloakService.logout(url);
    }

    #getEmail(tenantId: string) {
        const existingStored = this.storedTenants.filter(s => s.tenantId === tenantId);
        return existingStored.length === 1 ? existingStored[0].email : undefined;
    }
}