import * as plugins from './npmextra.plugins';
import * as paths from './npmextra.paths';

import { Task } from '@pushrocks/taskbuffer';

export type TKeyValueStore = 'path' | 'gitProject' | 'custom';

/**
 * kvStore is a simple key vlaue store to store data about projects between runs
 */
export class KeyValueStore {
  private dataObject: any = {};
  private deletedObject: any = {};
  public syncTask = new Task({
    name: 'syncTask',
    buffered: true,
    bufferMax: 1,
    execDelay: 0,
    taskFunction: async () => {
      this.dataObject = {
        ...plugins.smartfile.fs.toObjectSync(this.filePath),
        ...this.dataObject,
      };
      for (const key of Object.keys(this.deletedObject)) {
        delete this.dataObject[key];
      }
      this.deletedObject = {};
      await plugins.smartfile.memory.toFs(JSON.stringify(this.dataObject), this.filePath);
    },
  });
  /**
   * computes the identity
   */
  private initFilePath = () => {
    // determine the right base directory
    let baseDir: string;
    if (this.type === 'custom') {
      baseDir = paths.kvCustomDir;
    } else if (this.type === 'gitProject') {
      baseDir = paths.kvGitDir;
    } else if (this.type === 'path') {
      baseDir = paths.kvPathDir;
    }
    this.filePath = plugins.path.join(baseDir, this.identity + '.json');
    plugins.smartfile.fs.ensureDirSync(paths.kvCustomDir);
    plugins.smartfile.fs.ensureDirSync(paths.kvGitDir);
    plugins.smartfile.fs.ensureDirSync(paths.kvPathDir);
    plugins.smartfile.fs.ensureFileSync(this.filePath, '{}');
  };

  public type: TKeyValueStore; // the type of the kvStore
  public identity: string; // the identity of the kvStore
  public filePath: string; // the filePath of the kvStore

  /**
   * the constructor of keyvalue store
   * @param typeArg
   * @param customStringArg
   */
  constructor(typeArg: TKeyValueStore, customStringArg: string) {
    // set kvStoreType
    this.type = typeArg;
    this.identity = customStringArg;
    this.initFilePath();
  }

  /**
   * reads all keyValue pairs at once and returns them
   */
  public async readAll() {
    await this.syncTask.trigger();
    return this.dataObject;
  }

  /**
   * reads a keyValueFile from disk
   */
  public async readKey(keyArg: string) {
    await this.syncTask.trigger();
    return this.dataObject[keyArg];
  }

  /**
   * writes a specific key to the keyValueStore
   */
  public async writeKey(keyArg: string, valueArg: any) {
    await this.writeAll({
      [keyArg]: valueArg,
    });
  }

  public async deleteKey(keyArg: string) {
    this.deletedObject[keyArg] = this.dataObject[keyArg];
    await this.syncTask.trigger();
  }

  /**
   * writes all keyValue pairs in the object argument
   */
  public async writeAll(keyValueObject) {
    this.dataObject = { ...this.dataObject, ...keyValueObject };
    await this.syncTask.trigger();
  }

  /**
   * wipes a key value store from disk
   */
  public async wipe() {
    this.dataObject = {};
    await plugins.smartfile.fs.remove(this.filePath);
  }
}