import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';

import { EnvConfig } from '@app/models/envconfig.model';
import { DEFAULT_PROTOCOL } from '@app/util/constants';

const ENV_CONFIG_JSON_URL = './assets/config/envconfig.json';

export function envConfigFactory(envConfig: EnvconfigService) {
    return () => envConfig.loadEnvConfig();
}

@Injectable({
    providedIn: 'root'
})
export class EnvconfigService {
    private envConfig: EnvConfig;
    private uiHostname: string;

    constructor(private httpClient: HttpClient) {
        this.uiHostname = window.location.hostname;
    }

    loadEnvConfig(): Promise<void> {
        return new Promise(resolve => {
            this.httpClient.get<EnvConfig>(ENV_CONFIG_JSON_URL).subscribe(data => {
                this.envConfig = data;
                resolve();
            });
        });
    }

    getUschedulerWebAddress() {
        const protocol = this.envConfig.protocol || DEFAULT_PROTOCOL;
        const proxyWebAddress = this.envConfig.corsproxyWebAddress;
        let uschedulerWebAddress = this.envConfig.ushedulerWebAddress;
        const uschedulerHostname = uschedulerWebAddress.split(':')[0];
        const uschedulerPort = uschedulerWebAddress.split(':')[1];
        if (uschedulerHostname === '') {
            uschedulerWebAddress = `${this.uiHostname}:${uschedulerPort}`;
        }
        if (proxyWebAddress) {
            return `${protocol}//${proxyWebAddress}/${uschedulerWebAddress}`;
        }
        return `${protocol}//${uschedulerWebAddress}`;
    }

    getPrometheusWebAddress() {
        const protocol = this.envConfig.protocol || DEFAULT_PROTOCOL;
        const proxyWebAddress = this.envConfig.corsproxyWebAddress;
        let prometheusWebAddress = this.envConfig.prometheusWebAddress;
        const prometheusHostname = prometheusWebAddress.split(':')[0];
        const prometheusPort = prometheusWebAddress.split(':')[1];
        if (prometheusHostname === '') {
            prometheusWebAddress = `${this.uiHostname}:${prometheusPort}`;
        }
        if (proxyWebAddress) {
            return `${protocol}//${proxyWebAddress}/${prometheusWebAddress}`;
        }
        return `${protocol}//${prometheusWebAddress}`;
    }
}