import {
  ModelManagementService,
  PluginService,
  RegisterExtensionPoint,
  downloadFile,
  deleteFile,
  store,
  EventName,
  events
} from "@janhq/core";
import { parseToModel } from "./helper";

const downloadModel = (product) => {
  downloadFile(product.downloadUrl, product.fileName);
  checkDownloadProgress(product.fileName);
}

async function checkDownloadProgress(fileName: string) {
  if (typeof window !== "undefined" && typeof (window as any).electronAPI === "undefined") {
    const intervalId = setInterval(() => {
      fetchDownloadProgress(fileName, intervalId);
    }, 3000);
  }
}

async function fetchDownloadProgress(fileName: string, intervalId: NodeJS.Timeout): Promise<string> {
  const response = await fetch("/api/v1/downloadProgress", {
    method: 'POST',
    body: JSON.stringify({ fileName: fileName }),
    headers: { 'Content-Type': 'application/json', 'Authorization': '' }
  });

  if (!response.ok) {
    events.emit(EventName.OnDownloadError, null);
    clearInterval(intervalId);
    return;
  }
  const json = await response.json();
  if (isEmptyObject(json)) {
    if (!fileName && intervalId) {
      clearInterval(intervalId);
    }
    return Promise.resolve("");
  }
  if (json.success === true) {
    events.emit(EventName.OnDownloadSuccess, json);
    clearInterval(intervalId);
    return Promise.resolve("");
  } else {
    events.emit(EventName.OnDownloadUpdate, json);
    return Promise.resolve(json.fileName);
  }
}

function isEmptyObject(ojb: any): boolean {
  return Object.keys(ojb).length === 0;
}

const deleteModel = (path) => deleteFile(path);

/**
 * Retrieves a list of configured models from the model catalog URL.
 * @returns A Promise that resolves to an array of configured models.
 */
async function getConfiguredModels(): Promise<any> {
  // Add a timestamp to the URL to prevent caching
  return import(
    /* webpackIgnore: true */ MODEL_CATALOG_URL + `?t=${Date.now()}`
  ).then((module) =>
    module.default.map((e) => {
      return parseToModel(e);
    })
  );
}

/**
 * Store a model in the database when user start downloading it
 *
 * @param model Product
 */
function storeModel(model: any) {
  return store.findOne("models", model._id).then((doc) => {
    if (doc) {
      return store.updateOne("models", model._id, model);
    } else {
      return store.insertOne("models", model);
    }
  });
}

/**
 * Update the finished download time of a model
 *
 * @param model Product
 */
function updateFinishedDownloadAt(_id: string): Promise<any> {
  return store.updateMany(
    "models",
    { _id },
    { time: Date.now(), finishDownloadAt: 1 }
  );
}

/**
 * Retrieves all finished models from the database.
 *
 * @returns A promise that resolves with an array of finished models.
 */
function getFinishedDownloadModels(): Promise<any> {
  return store.findMany("models", { finishDownloadAt: 1 });
}

/**
 * Deletes a model from the database.
 *
 * @param modelId The ID of the model to delete.
 * @returns A promise that resolves when the model is deleted.
 */
function deleteDownloadModel(modelId: string): Promise<any> {
  return store.deleteOne("models", modelId);
}

/**
 * Retrieves a model from the database by ID.
 *
 * @param modelId The ID of the model to retrieve.
 * @returns A promise that resolves with the model.
 */
function getModelById(modelId: string): Promise<any> {
  return store.findOne("models", modelId);
}

function onStart() {
  store.createCollection("models", {});
  fetchDownloadProgress(null, null).then((fileName: string) => fileName && checkDownloadProgress(fileName));
}

// Register all the above functions and objects with the relevant extension points
export function init({ register }: { register: RegisterExtensionPoint }) {
  register(PluginService.OnStart, PLUGIN_NAME, onStart);

  register(
    ModelManagementService.DownloadModel,
    downloadModel.name,
    downloadModel
  );
  register(ModelManagementService.DeleteModel, deleteModel.name, deleteModel);
  register(
    ModelManagementService.GetConfiguredModels,
    getConfiguredModels.name,
    getConfiguredModels
  );

  register(ModelManagementService.StoreModel, storeModel.name, storeModel);
  register(
    ModelManagementService.UpdateFinishedDownloadAt,
    updateFinishedDownloadAt.name,
    updateFinishedDownloadAt
  );

  register(
    ModelManagementService.DeleteDownloadModel,
    deleteDownloadModel.name,
    deleteDownloadModel
  );
  register(
    ModelManagementService.GetModelById,
    getModelById.name,
    getModelById
  );
  register(
    ModelManagementService.GetFinishedDownloadModels,
    getFinishedDownloadModels.name,
    getFinishedDownloadModels
  );
}