import * as fs from 'fs';
import * as jsYaml from 'js-yaml';
import * as os from 'os';
import * as path from 'path';

import * as dotenv from 'dotenv';

dotenv.config({path:  path.join(os.homedir(), '.ocp/.env')});

const CREDENTIAL_FILE = 'credentials.json';

const environmentConfig: EnvironmentConfig = {
  rivendell: process.env.RIVENDELL || 'https://rivendell.zaius.com',
  awsRegion: process.env.AWS_REGION || 'us-east-1',
  uploadBucket: process.env.UPLOAD_BUCKET || 'zaius-apps'
};

export interface EnvironmentConfig {
  rivendell: string;
  awsRegion: string;
  uploadBucket: string;
}

export interface Credential {
  apiKey?: string;
}

export interface CredentialConfig {
  [key: string]: Partial<Credential>;
}

export function getEnv() {
  return process.env.OCP_ENV || 'production';
}

export function getDependencyFileUrl(runtime: string) {
  return `http://s3.amazonaws.com/zaius-public/zip/.env/production/${runtime}/dependencies.json`;
}

export function runtimeConfig(): EnvironmentConfig {
  return environmentConfig;
}

let cachedCredential: Credential;
export function getActiveCredential(): Credential {
  if (cachedCredential) {
    return cachedCredential;
  }
  const file = path.join(os.homedir(), `.ocp/${CREDENTIAL_FILE}`);
  if (fs.existsSync(file)) {
    try {
      const creds: CredentialConfig = jsYaml.safeLoad(fs.readFileSync(file, 'utf8')) || {};
      cachedCredential = creds || {};
    } catch (e) {
      console.error(`Unable to parse credential file.`);
      process.exit(1);
    }
  }
  return cachedCredential || {};
}