// tslint:disable-next-line:max-line-length
import {
  Disposable,
  workspace,
  window,
  Uri,
  ViewColumn,
  commands,
  StatusBarItem,
  TextDocument,
  StatusBarAlignment,
  TextDocumentChangeEvent,
  Range,
  WorkspaceConfiguration,
  ExtensionContext
} from "vscode";
import { Pulse } from "./pulse";
import { CodeStatsAPI } from "./code-stats-api";
import { ProfileProvider } from "./profile-provider";

export class XpCounter {
  private combinedDisposable: Disposable;
  private statusBarItem: StatusBarItem;
  private pulse: Pulse;
  private api: CodeStatsAPI;
  private updateTimeout: any;

  //    private languages: Array<string> = ["typescript", "javascript"];

  // wait 10s after each change in the document before sending an update
  private UPDATE_DELAY = 10000;


  constructor(context: ExtensionContext) {
    this.pulse = new Pulse();

    /* // print out supported language names
        let allLanguages = languages.getLanguages().then(
            (result => {
                console.log(JSON.stringify(result));
            })
        );
        */

    this.initAPI();

    let subscriptions: Disposable[] = [];

    if (!this.statusBarItem) {
      this.statusBarItem = window.createStatusBarItem(StatusBarAlignment.Left);
      this.statusBarItem.command = "code-stats.profile";
    }

    subscriptions.push(workspace.registerTextDocumentContentProvider('code-stats', new ProfileProvider(context, this.api)));
 
    subscriptions.push(commands.registerCommand("code-stats.profile", () => {

      let config: WorkspaceConfiguration = workspace.getConfiguration(
        "codestats"
      );

      if (!config) {
        window.showErrorMessage('codestats.username configuration setting is missing');
        return;
      }
  
      if( config.get("username") === '' ){
        window.showErrorMessage('codestats.username configuration setting is missing');
        return;
      }

      commands.executeCommand('vscode.previewHtml',  Uri.parse('code-stats://profile'), ViewColumn.Two, 'Code::Stats Profile');
    }));
    
    workspace.onDidChangeTextDocument(
      this.onTextDocumentChanged,
      this,
      subscriptions
    );
    workspace.onDidChangeConfiguration(this.initAPI, this, subscriptions);
    this.combinedDisposable = Disposable.from(...subscriptions);
  }

  dispose(): void {
    this.combinedDisposable.dispose();
    this.statusBarItem.dispose();
  }

  private onTextDocumentChanged(event: TextDocumentChangeEvent): void {
    this.updateXpCount(event.document, 1);
  }

  public updateXpCount(document: TextDocument, changeCount: number): void {
    let show: boolean;
    if (this.isSupportedLanguage(document.languageId)) {
      this.pulse.addXP(document.languageId, changeCount);
      show = true;
    } else {
      show = false;
    }
    this.updateStatusBar(show, `${this.pulse.getXP(document.languageId)}`);

    // each change resets the timeout so we only send updates when there is a 10s delay in updates to the document
    if (this.updateTimeout !== null) {
      clearTimeout(this.updateTimeout);
    }

    this.updateTimeout = setTimeout(() => {
      const promise = this.api.sendUpdate(this.pulse);

      if (promise !== null) {
        promise.then(() => {
          this.updateStatusBar(
            show,
            `${this.pulse.getXP(document.languageId)}`
          );
        });
      }
    }, this.UPDATE_DELAY);
  }

  private updateStatusBar(show: boolean, changeCount: string): void {
    if (!show) {
      this.statusBarItem.hide();
    } else {
      this.statusBarItem.text = `$(pencil) C::S ${changeCount}`;
      this.statusBarItem.show();
    }
  }

  private isSupportedLanguage(language: string): boolean {
    // todo: check supported languages
    // only update xp if one of supported languages
    return true;
  }

  private initAPI() {
    let config: WorkspaceConfiguration = workspace.getConfiguration(
      "codestats"
    );
    if (!config) {
      return;
    }

    const apiKey: string = config.get("apikey");
    const apiURL: string = config.get("apiurl");
    const userName: string = config.get("username");
    
    console.log(
      `code-stats-vscode setting up:
      API URL: ${apiURL}
      NAME:    ${userName}      
      KEY:     ${apiKey}
      `
    );

    if( this.api != null )
      this.api.updateSettings(apiKey, apiURL, userName);
    else
      this.api = new CodeStatsAPI(apiKey,apiURL,userName);
  }
}