import { Client as ElasticClient } from '@elastic/elasticsearch';
import type { ILogContext, ILogPackage, ILogDestination } from '@push.rocks/smartlog-interfaces';
import { ElasticScheduler } from './els.classes.elasticscheduler.js';
import { ElasticIndex } from './els.classes.elasticindex.js';

export interface IStandardLogParams {
  message: string;
  severity: string;
}

export interface IElasticSearchConstructorOptions {
  indexPrefix: string;
  indexRetention: number;
  node: string;
  auth?: {
    username: string;
    password: string;
  };
}

export class ElsSmartlogDestination<T> {
  public client: ElasticClient;
  public elasticScheduler = new ElasticScheduler(this);
  public elasticIndex: ElasticIndex = new ElasticIndex(this);

  public indexPrefix: string;
  public indexRetention: number;

  constructor(optionsArg: IElasticSearchConstructorOptions) {
    this.client = new ElasticClient({
      node: optionsArg.node,
      ...(optionsArg.auth && { auth: optionsArg.auth }),
    });
    this.indexPrefix = `${optionsArg.indexPrefix}`;
    this.indexRetention = optionsArg.indexRetention;
    this.setupDataStream();
  }

  private async setupDataStream() {
    // Define an index template
    await this.client.indices.putIndexTemplate({
      name: `${this.indexPrefix}_template`,
      index_patterns: [`${this.indexPrefix}-*`],
      data_stream: {},
    });
  }

  public async log(logPackageArg: ILogPackage, scheduleOverwrite = false) {
    const now = new Date();
    const indexToUse = `${this.indexPrefix}-data-stream`; // Use data stream name

    if (this.elasticScheduler.docsScheduled && !scheduleOverwrite) {
      this.elasticScheduler.scheduleDoc(logPackageArg);
      return;
    }

    await this.client.index(
      {
        index: indexToUse,
        body: {
          '@timestamp': new Date(logPackageArg.timestamp).toISOString(),
          ...logPackageArg,
        },
      }
    );
  }

  get logDestination(): ILogDestination {
    return {
      handleLog: async (smartlogPackageArg: ILogPackage) => {
        await this.log(smartlogPackageArg);
      },
    };
  }
}