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

const { remote, ipcRenderer, shell } = require("electron");
const path = require("path");
const { download } = remote.require("electron-dl");
const fs = remote.require("fs");
const { lbrySettings: config } = require("../../../app/package.json");

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

    dispatch(doChangePath(url));

    const state = getState();
    const pageTitle = selectPageTitle(state);
    const historyState = history.state;

    dispatch(
      doHistoryPush({ params, page: historyState.page + 1 }, pageTitle, url)
    );
  };
}

export function doAuthNavigate(pathAfterAuth = null, params = {}) {
  return function(dispatch, getState) {
    if (pathAfterAuth) {
      dispatch({
        type: types.CHANGE_AFTER_AUTH_PATH,
        data: {
          path: `${pathAfterAuth}?${toQueryString(params)}`,
        },
      });
    }
    dispatch(doNavigate("/auth"));
  };
}

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

    const state = getState();
    const pageTitle = selectPageTitle(state);
    const scrollY = options.scrollY;

    window.document.title = pageTitle;

    if (scrollY) window.scrollTo(0, scrollY);
    else 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) {
    // Get back history from stack
    const back = selectHistoryBack(getState());

    if (back) {
      // Set location
      dispatch(doChangePath(back.location));

      dispatch({
        type: types.HISTORY_NAVIGATE,
        data: { page: back },
      });
    }
  };
}

export function doHistoryForward() {
  return function(dispatch, getState) {
    // Get forward history from stack
    const forward = selectHistoryForward(getState());

    if (forward) {
      // Set location
      dispatch(doChangePath(forward.location));

      dispatch({
        type: types.HISTORY_NAVIGATE,
        data: { page: forward },
      });
    }
  };
}

export function doHistoryPush(currentState, title, relativeUrl) {
  return function(dispatch, getState) {
    title += " - LBRY";
    history.pushState(currentState, title, `#${relativeUrl}`);
    dispatch({
      type: types.HISTORY_NAVIGATE,
      data: {
        location: relativeUrl,
      },
    });
  };
}

export function doRecordScroll(scroll) {
  return function(dispatch, getState) {
    const state = getState();
    const historyState = history.state;

    if (!historyState) return;

    historyState.scrollY = scroll;
    history.replaceState(
      historyState,
      document.title,
      `#${state.app.currentPath}`
    );
  };
}

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(
      remote.app.getPath("temp") + require("path").sep
    ),
      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 doCheckDaemonVersion() {
  return function(dispatch, getState) {
    lbry.version().then(({ lbrynet_version }) => {
      dispatch({
        type: config.lbrynetDaemonVersion == lbrynet_version
          ? types.DAEMON_VERSION_MATCH
          : types.DAEMON_VERSION_MISMATCH,
      });
    });
  };
}

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

export function doDaemonReady() {
  return function(dispatch, getState) {
    const path = window.location.hash || "#/discover";
    const params = parseQueryParams(path.split("?")[1] || "");

    // Get first page
    const page = {
      index: 0,
      location: path.replace(/^#/, ""),
    };

    history.replaceState(
      { params, is_first_page: true, page: 1 },
      document.title,
      `${path}`
    );
    dispatch(doAuthenticate());
    dispatch({
      type: types.DAEMON_READY,
      data: { page },
    });
    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();
  };
}

export function doQuit() {
  return function(dispatch, getState) {
    remote.app.quit();
  };
}

export function doGetThemes() {
  const dir = `${remote.app.getAppPath()}/dist/themes`;

  // Get all .css files
  const files = fs
    .readdirSync(dir)
    .filter(file => path.extname(file) === ".css");

  return function(dispatch, getState) {
    // Find themes
    const themes = files.map(file => ({
      name: file.replace(".css", ""),
      path: `./themes/${file}`,
    }));

    dispatch(doSetClientSetting("themes", themes));
  };
}