/**
 * @author Martin Karkowski
 * @email m.karkowski@zema.de
 * @create date 2020-03-09 12:17:36
 * @modify date 2020-09-09 15:59:10
 * @desc [description]
 */

import { mapLimit } from "async";
import { StaticPool } from "node-worker-threads-pool";
import { cpus } from "os";
import * as TJS from "typescript-json-schema";
import { SystemLogger } from "../../mod-Logger/src/Unique.Logger";
import { FOLDER_SEPERATOR } from "./config-generator";

/**
 * Helper Function, that will use multiple Threads to create the JSON-Schemas.
 *
 * @export
 * @param {string[]} extensionPathes
 * @param {string[]} files
 * @param {string} schemaDir
 */
export async function generateJSONSchemas(
  extensionPathes: string[],
  files: string[],
  schemaDir: string
) {
  const pool = new StaticPool({
    size: Math.max(cpus().length - 1, 1),
    workerData: {
      level: SystemLogger.logger.level
    },
    task: async (params: { name: string; schemaDir: string; file: string }) => {
      const path = require("path");
      const fs = require("fs");
      const util = require("util");
      const TJS = require("typescript-json-schema");
      const { workerData } = require("worker_threads");

      const SystemLogger = require(path.join(
        workerData.currentDir,
        "../../mod-Logger/src/Unique.Logger"
      )).SystemLogger.logger;

      SystemLogger.level = this.workerData.level;
      const logger = SystemLogger.getLogger("module-loader");

      // Promisified Version of Write File.
      const _writeFile = util.promisify(fs.writeFile);

      /** Get the JSON Schema, make Parameters Required*/
      const _settings: TJS.PartialArgs = {
        required: true
      };

      const compilerOptions: TJS.CompilerOptions = {
        strictNullChecks: true,
        skipLibCheck: true
      };

      const _program = TJS.getProgramFromFiles(
        [params.file],
        compilerOptions
      );

      // We can either get the schema for one file and one type...
      const _schema = TJS.generateSchema(_program, "*", _settings);

      await _writeFile(
        path.join(params.schemaDir, params.name + ".json"),
        JSON.stringify(_schema, undefined, 4)
      );

      logger.info("Generating JSON-Schema for " + params.name);
    },
    workerData: {
      currentDir: __dirname
    }
  });

  const _modsToGenerate: {
    name: string;
    schemaDir: string;
    file: string;
  }[] = [];

  for (const _mod of extensionPathes) {
    const _name = _mod.split(FOLDER_SEPERATOR)[
      _mod.split(FOLDER_SEPERATOR).length - 1
    ];
    let _typeName = _name.slice(0, _name.length - ".js".length) + "-Types.ts";
    let _typeFile: string | undefined = undefined;

    /** Search for the Type-Defintion File */
    for (const _foundTypeFile of files) {
      if (_foundTypeFile.endsWith(_typeName)) {
        _typeFile = _foundTypeFile;
        break;
      }
    }

    /** Adapt the Name */
    _typeName = _typeName.split("-Module-Types.ts")[0];

    /** Only if a type File is provided => Get the JSON-Schema */
    if (_typeFile) {
      _modsToGenerate.push({ name: _typeName, file: _typeFile, schemaDir });
    }
  }

  await mapLimit(_modsToGenerate, cpus().length, async (data) => {
    return pool.exec(data);
  });

  pool.destroy();
}