import * as types from "constants/action_types";
import lbry from "lbry";
import {
  selectUpdateUrl,
  selectUpgradeDownloadPath,
  selectUpgradeDownloadItem,
  selectUpgradeFilename,
  selectPageTitle,
  selectCurrentPage,
  selectCurrentParams,
} from "selectors/app";
import { doSearch } from "actions/search";
import { doFetchDaemonSettings } from "actions/settings";
import { doAuthenticate } from "actions/user";
import { doFileList } from "actions/file_info";

const { remote, ipcRenderer, shell } = require("electron");
const path = require("path");
const app = require("electron").remote.app;
const { download } = remote.require("electron-dl");
const fs = remote.require("fs");

const queryStringFromParams = params => {
  return Object.keys(params).map(key => `${key}=${params[key]}`).join("&");
};

export function doNavigate(path, params = {}) {
  return function(dispatch, getState) {
    let url = path;
    if (params) url = `${url}?${queryStringFromParams(params)}`;

    dispatch(doChangePath(url));

    const state = getState();
    const pageTitle = selectPageTitle(state);
    dispatch(doHistoryPush(params, pageTitle, url));
  };
}

export function doChangePath(path) {
  return function(dispatch, getState) {
    dispatch({
      type: types.CHANGE_PATH,
      data: {
        path,
      },
    });

    const state = getState();
    const pageTitle = selectPageTitle(state);
    window.document.title = pageTitle;
    window.scrollTo(0, 0);

    const currentPage = selectCurrentPage(state);
    if (currentPage === "search") {
      const params = selectCurrentParams(state);
      dispatch(doSearch(params.query));
    }
  };
}

export function doHistoryBack() {
  return function(dispatch, getState) {
    if (!history.state) return;

    history.back();
  };
}

export function doHistoryPush(params, title, relativeUrl) {
  return function(dispatch, getState) {
    title += " - LBRY";
    history.pushState(params, title, `#${relativeUrl}`);
  };
}

export function doOpenModal(modal) {
  return {
    type: types.OPEN_MODAL,
    data: {
      modal,
    },
  };
}

export function doCloseModal() {
  return {
    type: types.CLOSE_MODAL,
  };
}

export function doUpdateDownloadProgress(percent) {
  return {
    type: types.UPGRADE_DOWNLOAD_PROGRESSED,
    data: {
      percent: percent,
    },
  };
}

export function doSkipUpgrade() {
  return {
    type: types.SKIP_UPGRADE,
  };
}

export function doStartUpgrade() {
  return function(dispatch, getState) {
    const state = getState();
    const upgradeDownloadPath = selectUpgradeDownloadPath(state);

    ipcRenderer.send("upgrade", upgradeDownloadPath);
  };
}

export function doDownloadUpgrade() {
  return function(dispatch, getState) {
    const state = getState();
    // Make a new directory within temp directory so the filename is guaranteed to be available
    const dir = fs.mkdtempSync(app.getPath("temp") + require("path").sep);
    const upgradeFilename = selectUpgradeFilename(state);

    let options = {
      onProgress: p => dispatch(doUpdateDownloadProgress(Math.round(p * 100))),
      directory: dir,
    };
    download(
      remote.getCurrentWindow(),
      selectUpdateUrl(state),
      options
    ).then(downloadItem => {
      /**
         * TODO: get the download path directly from the download object. It should just be
         * downloadItem.getSavePath(), but the copy on the main process is being garbage collected
         * too soon.
         */

      dispatch({
        type: types.UPGRADE_DOWNLOAD_COMPLETED,
        data: {
          downloadItem,
          path: path.join(dir, upgradeFilename),
        },
      });
    });

    dispatch({
      type: types.UPGRADE_DOWNLOAD_STARTED,
    });
    dispatch({
      type: types.OPEN_MODAL,
      data: {
        modal: "downloading",
      },
    });
  };
}

export function doCancelUpgrade() {
  return function(dispatch, getState) {
    const state = getState();
    const upgradeDownloadItem = selectUpgradeDownloadItem(state);

    if (upgradeDownloadItem) {
      /*
       * Right now the remote reference to the download item gets garbage collected as soon as the
       * the download is over (maybe even earlier), so trying to cancel a finished download may
       * throw an error.
       */
      try {
        upgradeDownloadItem.cancel();
      } catch (err) {
        console.error(err);
        // Do nothing
      }
    }

    dispatch({ type: types.UPGRADE_CANCELLED });
  };
}

export function doCheckUpgradeAvailable() {
  return function(dispatch, getState) {
    const state = getState();

    lbry.getAppVersionInfo().then(({ remoteVersion, upgradeAvailable }) => {
      if (upgradeAvailable) {
        dispatch({
          type: types.UPDATE_VERSION,
          data: {
            version: remoteVersion,
          },
        });
        dispatch({
          type: types.OPEN_MODAL,
          data: {
            modal: "upgrade",
          },
        });
      }
    });
  };
}

export function doAlertError(errorList) {
  return function(dispatch, getState) {
    const state = getState();
    console.log("do alert error");
    console.log(errorList);
    dispatch({
      type: types.OPEN_MODAL,
      data: {
        modal: "error",
        extraContent: errorList,
      },
    });
  };
}

export function doDaemonReady() {
  return function(dispatch, getState) {
    dispatch(doAuthenticate());
    dispatch({
      type: types.DAEMON_READY,
    });
    dispatch(doFetchDaemonSettings());
    dispatch(doFileList());
  };
}

export function doShowSnackBar(data) {
  return {
    type: types.SHOW_SNACKBAR,
    data,
  };
}

export function doRemoveSnackBarSnack() {
  return {
    type: types.REMOVE_SNACKBAR_SNACK,
  };
}

export function doClearCache() {
  return function(dispatch, getState) {
    window.cacheStore.purge();

    return Promise.resolve();
  };
}