// Copyright 2022 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import { randomUUID } from 'crypto';
import * as vscode from 'vscode';

import * as metric_properties from './metric_properties';

const ENABLED_PROPERTY = 'analytics-status';
const UUID_PROPERTY = 'uuid';

export class PersistentStatus {
  private readonly launchedProperty;

  constructor(toolName: string) {
    this.launchedProperty = `${toolName}-launched`;
  }

  async enable(): Promise<void> {
    await metric_properties.setBoolean(ENABLED_PROPERTY, true);
    await metric_properties.set(UUID_PROPERTY, randomUUID());
  }

  async disable(): Promise<void> {
    await metric_properties.setBoolean(ENABLED_PROPERTY, false);
    await metric_properties.deleteProperty(UUID_PROPERTY);
  }

  async isEnabled(): Promise<boolean> {
    // Treat undefined as false
    return (await metric_properties.getBoolean(ENABLED_PROPERTY)) === true;
  }

  async getUuid(): Promise<string | undefined> {
    return await metric_properties.get(UUID_PROPERTY);
  }

  async isFirstLaunchOfFirstTool(): Promise<boolean> {
    return !(await metric_properties.exists(ENABLED_PROPERTY));
  }

  async markAsDirectlyLaunched() {
    await metric_properties.set(this.launchedProperty, '');
  }
  async isFirstDirectLaunch(): Promise<boolean> {
    return !(await metric_properties.exists(this.launchedProperty));
  }

  onDidChangeEnabled(watcher: EnabledPropertyWatcher, listener: (enabled: boolean) => any) {
    return watcher.onDidChange(async (e) => {
      listener(await this.isEnabled());
    });
  }
}

export class EnabledPropertyWatcher {
  private readonly watcher: vscode.FileSystemWatcher;

  constructor() {
    const pattern =
      new vscode.RelativePattern(metric_properties.getMetricDirectory(), ENABLED_PROPERTY);
    this.watcher = vscode.workspace.createFileSystemWatcher(pattern);
  }

  onDidChange(listener: (e: vscode.Uri) => any) {
    return this.watcher.onDidChange(listener);
  }

  dispose() {
    this.watcher.dispose();
  }
}