import { LanguageClient, StatusBarItem, workspace } from "coc.nvim";
import { Disposable } from "vscode-jsonrpc";
import { cclsChan } from './globalContext';
import { dedent, unwrap } from './utils';

const window = workspace;

interface CclsInfoResponse {
  db: {
    files: number;
    funcs: number;
    types: number;
    vars: number;
  };
  pipeline: {
    pendingIndexRequests: number;
  };
  project: {
    entries: number;
  };
}

export class StatusBarIconProvider implements Disposable {
  private icon: StatusBarItem;
  private timer: NodeJS.Timer;
  private wasError = false;

  public constructor(private client: LanguageClient, private updateInterval: number) {
    this.icon = window.createStatusBarItem();
    this.icon.text = "ccls: loading";
    // this.icon.tooltip = "ccls is starting / loading project metadata";
    this.icon.show();

    this.timer = setInterval(this.updateStatus.bind(this), updateInterval);
  }

  public dispose() {
    clearInterval(this.timer);
    this.icon.dispose();
  }

  private async updateStatus() {
    let info: CclsInfoResponse;
    try {
      info = await this.client.sendRequest<CclsInfoResponse>("$ccls/info");
      this.wasError = false;
    } catch (e) {
      if (this.wasError)
        return;
      this.wasError = true;
      this.icon.text = "ccls: error";
      // this.icon.color = "red";
      // this.icon.tooltip = "Failed to perform info request: " + (e as Error).message;
      unwrap(cclsChan).show();
      return;
    }
    // this.icon.color = "";
    this.icon.text = `ccls: ${info.pipeline.pendingIndexRequests || 0} jobs`;
    // this.icon.tooltip = dedent`${info.db.files} files,
    //   ${info.db.funcs} functions,
    //   ${info.db.types} types,
    //   ${info.db.vars} variables,
    //   ${info.project.entries} entries in project.
    //
    //   ${info.pipeline.pendingIndexRequests} pending index requests`;
  }
}