import { handleNetworkError } from "../shared/errors.js";
import { instanciateData } from "../shared/instanciateData.js";
import { authService, AuthService } from "./AuthService.js";
import { AppData, AppDataAndChanges } from "./DataStore.js";

export class RemoteStore {
  #authService: AuthService;

  constructor(authService: AuthService) {
    this.#authService = authService;
  }

  async getAppData(): Promise<AppData> {
    const result = await fetch("/api/user-data", {
      headers: { Authorization: `Bearer ${this.#authService.getToken()}` },
    });
    await handleNetworkError(result);
    const data: AppData = await result.json();
    return instanciateData(data);
  }

  async sendChanges({ appData, changes }: AppDataAndChanges): Promise<AppData> {
    const result = await fetch("/api/user-data", {
      method: "PUT",
      body: JSON.stringify({ userData: appData, changes }),
      headers: {
        "Content-Type": "application/json",
        Authorization: `Bearer ${this.#authService.getToken()}`,
      },
    });
    await handleNetworkError(result);
    const data: AppData = await result.json();
    return instanciateData(data);
  }

  async import(file: File) {
    const result = await fetch("/api/import", {
      method: "POST",
      headers: { Authorization: `Bearer ${this.#authService.getToken()}` },
      body: file,
    });
    await handleNetworkError(result);
  }

  async exportJson() {
    const result = await fetch("/api/export", {
      headers: { Authorization: `Bearer ${this.#authService.getToken()}` },
    });
    await handleNetworkError(result);
    this.#download(
      await result.text(),
      `flip-flip-flip-${Temporal.Now.plainDateISO()}.json`,
      "application/json",
    );
  }

  async exportCsv() {
    const result = await fetch("/api/export", {
      headers: {
        Authorization: `Bearer ${this.#authService.getToken()}`,
        Accept: "text/csv",
      },
    });
    await handleNetworkError(result);
    this.#download(
      await result.text(),
      `flip-flip-flip-${Temporal.Now.plainDateISO()}.csv`,
      "text/csv",
    );
  }

  #download(content: string, filename: string, mimeType: string) {
    const blob = new Blob([content], { type: mimeType });
    const link = document.createElement("a");
    const url = URL.createObjectURL(blob);
    link.href = url;
    link.download = filename;
    link.click();
    URL.revokeObjectURL(url);
  }
}

export const remoteStore = new RemoteStore(authService);