//
//  Created by Chen Mingliang on 20/7/16.
//  illuspas[a]msn.com
//  Copyright (c) 2020 Nodemedia. All rights reserved.
//
const Logger = require('./node_core_logger');

const NodeFissionSession = require('./node_fission_session');
const context = require('./node_core_ctx');
const { getFFmpegVersion, getFFmpegUrl } = require('./node_core_utils');
const fs = require('fs');
const _ = require('lodash');
const mkdirp = require('mkdirp');

class NodeFissionServer {
  constructor(config) {
    this.config = config;
    this.fissionSessions = new Map();
  }

  async run() {
    try {
      mkdirp.sync(this.config.http.mediaroot);
      fs.accessSync(this.config.http.mediaroot, fs.constants.W_OK);
    } catch (error) {
      Logger.error(`Node Media Fission Server startup failed. MediaRoot:${this.config.http.mediaroot} cannot be written.`);
      return;
    }

    try {
      fs.accessSync(this.config.fission.ffmpeg, fs.constants.X_OK);
    } catch (error) {
      Logger.error(`Node Media Fission Server startup failed. ffmpeg:${this.config.fission.ffmpeg} cannot be executed.`);
      return;
    }

    let version = await getFFmpegVersion(this.config.fission.ffmpeg);
    if (version === '' || parseInt(version.split('.')[0]) < 4) {
      Logger.error(`Node Media Fission Server startup failed. ffmpeg requires version 4.0.0 above`);
      Logger.error('Download the latest ffmpeg static program:', getFFmpegUrl());
      return;
    }

    context.nodeEvent.on('postPublish', this.onPostPublish.bind(this));
    context.nodeEvent.on('donePublish', this.onDonePublish.bind(this));
    Logger.log(`Node Media Fission Server started, MediaRoot: ${this.config.http.mediaroot}, ffmpeg version: ${version}`);
  }

  onPostPublish(id, streamPath, args) {
    let regRes = /\/(.*)\/(.*)/gi.exec(streamPath);
    let [app, name] = _.slice(regRes, 1);
    for (let task of this.config.fission.tasks) {
      regRes = /(.*)\/(.*)/gi.exec(task.rule);
      let [ruleApp, ruleName] = _.slice(regRes, 1);
      if ((app === ruleApp || ruleApp === "*") && (name === ruleName || ruleName === "*")) {
        let s = context.sessions.get(id);
        if (s.isLocal && name.split('_')[1]) {
          continue;
        }
        let conf = task;
        conf.ffmpeg = this.config.fission.ffmpeg;
        conf.mediaroot = this.config.http.mediaroot;
        conf.rtmpPort = this.config.rtmp.port;
        conf.streamPath = streamPath;
        conf.streamApp = app;
        conf.streamName = name;
        conf.args = args;
        let session = new NodeFissionSession(conf);
        this.fissionSessions.set(id, session);
        session.on('end', () => {
          this.fissionSessions.delete(id);
        });
        session.run();
      }
    }
  }

  onDonePublish(id, streamPath, args) {
    let session = this.fissionSessions.get(id);
    if (session) {
      session.end();
    }
  }
}

module.exports = NodeFissionServer;