import { IntlMessageFormat } from "intl-messageformat";
import { defineMessages } from "react-intl";

import { List as ImmutableList } from "immutable";

import { compareId } from "flavours/glitch/compare_id";
import { usePendingItems as preferPendingItems } from "flavours/glitch/initial_state";
import { unescapeHTML } from "flavours/glitch/utils/html";
import { requestNotificationPermission } from "flavours/glitch/utils/notifications";

import api, { getLinks } from "../api";

import { fetchFollowRequests, fetchRelationships } from "./accounts";
import {
  importFetchedAccount,
  importFetchedAccounts,
  importFetchedStatus,
  importFetchedStatuses,
} from "./importer";
import { submitMarkers } from "./markers";
import { register as registerPushNotifications } from "./push_notifications";
import { saveSettings } from "./settings";




export const NOTIFICATIONS_UPDATE = "NOTIFICATIONS_UPDATE";
export const NOTIFICATIONS_UPDATE_NOOP = "NOTIFICATIONS_UPDATE_NOOP";

// tracking the notif cleaning request
export const NOTIFICATIONS_DELETE_MARKED_REQUEST = "NOTIFICATIONS_DELETE_MARKED_REQUEST";
export const NOTIFICATIONS_DELETE_MARKED_SUCCESS = "NOTIFICATIONS_DELETE_MARKED_SUCCESS";
export const NOTIFICATIONS_DELETE_MARKED_FAIL = "NOTIFICATIONS_DELETE_MARKED_FAIL";
export const NOTIFICATIONS_MARK_ALL_FOR_DELETE = "NOTIFICATIONS_MARK_ALL_FOR_DELETE";
export const NOTIFICATIONS_ENTER_CLEARING_MODE = "NOTIFICATIONS_ENTER_CLEARING_MODE"; // arg: yes
// Unmark notifications (when the cleaning mode is left)
export const NOTIFICATIONS_UNMARK_ALL_FOR_DELETE = "NOTIFICATIONS_UNMARK_ALL_FOR_DELETE";
// Mark one for delete
export const NOTIFICATION_MARK_FOR_DELETE = "NOTIFICATION_MARK_FOR_DELETE";

export const NOTIFICATIONS_EXPAND_REQUEST = "NOTIFICATIONS_EXPAND_REQUEST";
export const NOTIFICATIONS_EXPAND_SUCCESS = "NOTIFICATIONS_EXPAND_SUCCESS";
export const NOTIFICATIONS_EXPAND_FAIL    = "NOTIFICATIONS_EXPAND_FAIL";

export const NOTIFICATIONS_FILTER_SET = "NOTIFICATIONS_FILTER_SET";

export const NOTIFICATIONS_CLEAR        = "NOTIFICATIONS_CLEAR";
export const NOTIFICATIONS_SCROLL_TOP   = "NOTIFICATIONS_SCROLL_TOP";
export const NOTIFICATIONS_LOAD_PENDING = "NOTIFICATIONS_LOAD_PENDING";

export const NOTIFICATIONS_MOUNT   = "NOTIFICATIONS_MOUNT";
export const NOTIFICATIONS_UNMOUNT = "NOTIFICATIONS_UNMOUNT";

export const NOTIFICATIONS_SET_VISIBILITY = "NOTIFICATIONS_SET_VISIBILITY";

export const NOTIFICATIONS_MARK_AS_READ = "NOTIFICATIONS_MARK_AS_READ";

export const NOTIFICATIONS_SET_BROWSER_SUPPORT    = "NOTIFICATIONS_SET_BROWSER_SUPPORT";
export const NOTIFICATIONS_SET_BROWSER_PERMISSION = "NOTIFICATIONS_SET_BROWSER_PERMISSION";

defineMessages({
  mention: { id: "notification.mention", defaultMessage: "{name} mentioned you" },
});

const fetchRelatedRelationships = (dispatch, notifications) => {
  const accountIds = notifications.filter(item => ["follow", "follow_request", "admin.sign_up"].indexOf(item.type) !== -1).map(item => item.account.id);

  if (accountIds > 0) {
    dispatch(fetchRelationships(accountIds));
  }
};

export const loadPending = () => ({
  type: NOTIFICATIONS_LOAD_PENDING,
});

export function updateNotifications(notification, intlMessages, intlLocale) {
  return (dispatch, getState) => {
    const activeFilter = getState().getIn(["settings", "notifications", "quickFilter", "active"]);
    const showInColumn = activeFilter === "all" ? getState().getIn(["settings", "notifications", "shows", notification.type], true) : activeFilter === notification.type;
    const showAlert    = getState().getIn(["settings", "notifications", "alerts", notification.type], true);
    const playSound    = getState().getIn(["settings", "notifications", "sounds", notification.type], true);

    let filtered = false;

    if (["mention", "status"].includes(notification.type) && notification.status.filtered) {
      const filters = notification.status.filtered.filter(result => result.filter.context.includes("notifications"));

      if (filters.some(result => result.filter.filter_action === "hide")) {
        return;
      }

      filtered = filters.length > 0;
    }

    if (["follow_request"].includes(notification.type)) {
      dispatch(fetchFollowRequests());
    }

    dispatch(submitMarkers());

    if (showInColumn) {
      dispatch(importFetchedAccount(notification.account));

      if (notification.status) {
        dispatch(importFetchedStatus(notification.status));
      }

      if (notification.report) {
        dispatch(importFetchedAccount(notification.report.target_account));
      }

      dispatch({
        type: NOTIFICATIONS_UPDATE,
        notification,
        usePendingItems: preferPendingItems,
        meta: (playSound && !filtered) ? { sound: "boop" } : undefined,
      });

      fetchRelatedRelationships(dispatch, [notification]);
    } else if (playSound && !filtered) {
      dispatch({
        type: NOTIFICATIONS_UPDATE_NOOP,
        meta: { sound: "boop" },
      });
    }

    // Desktop notifications
    if (typeof window.Notification !== "undefined" && showAlert && !filtered) {
      const title = new IntlMessageFormat(intlMessages[`notification.${notification.type}`], intlLocale).format({ name: notification.account.display_name.length > 0 ? notification.account.display_name : notification.account.username });
      const body  = (notification.status && notification.status.spoiler_text.length > 0) ? notification.status.spoiler_text : unescapeHTML(notification.status ? notification.status.content : "");

      const notify = new Notification(title, { body, icon: notification.account.avatar, tag: notification.id });
      notify.addEventListener("click", () => {
        window.focus();
        notify.close();
      });
    }
  };
}

const excludeTypesFromSettings = state => state.getIn(["settings", "notifications", "shows"]).filter(enabled => !enabled).keySeq().toJS();


const excludeTypesFromFilter = filter => {
  const allTypes = ImmutableList([
    "follow",
    "follow_request",
    "favourite",
    "reblog",
    "mention",
    "poll",
    "status",
    "update",
    "admin.sign_up",
    "admin.report",
  ]);

  return allTypes.filterNot(item => item === filter).toJS();
};

const noOp = () => {};

let expandNotificationsController = new AbortController();

export function expandNotifications({ maxId, forceLoad } = {}, done = noOp) {
  return (dispatch, getState) => {
    const activeFilter = getState().getIn(["settings", "notifications", "quickFilter", "active"]);
    const notifications = getState().get("notifications");
    const isLoadingMore = !!maxId;

    if (notifications.get("isLoading")) {
      if (forceLoad) {
        expandNotificationsController.abort();
        expandNotificationsController = new AbortController();
      } else {
        done();
        return;
      }
    }

    const params = {
      max_id: maxId,
      exclude_types: activeFilter === "all"
        ? excludeTypesFromSettings(getState())
        : excludeTypesFromFilter(activeFilter),
    };

    if (!params.max_id && (notifications.get("items", ImmutableList()).size + notifications.get("pendingItems", ImmutableList()).size) > 0) {
      const a = notifications.getIn(["pendingItems", 0, "id"]);
      const b = notifications.getIn(["items", 0, "id"]);

      if (a && b && compareId(a, b) > 0) {
        params.since_id = a;
      } else {
        params.since_id = b || a;
      }
    }

    const isLoadingRecent = !!params.since_id;

    dispatch(expandNotificationsRequest(isLoadingMore));

    api(getState).get("/api/v1/notifications", { params, signal: expandNotificationsController.signal }).then(response => {
      const next = getLinks(response).refs.find(link => link.rel === "next");

      dispatch(importFetchedAccounts(response.data.map(item => item.account)));
      dispatch(importFetchedStatuses(response.data.map(item => item.status).filter(status => !!status)));
      dispatch(importFetchedAccounts(response.data.filter(item => item.report).map(item => item.report.target_account)));

      dispatch(expandNotificationsSuccess(response.data, next ? next.uri : null, isLoadingMore, isLoadingRecent, isLoadingRecent && preferPendingItems));
      fetchRelatedRelationships(dispatch, response.data);
      dispatch(submitMarkers());
    }).catch(error => {
      dispatch(expandNotificationsFail(error, isLoadingMore));
    }).finally(() => {
      done();
    });
  };
}

export function expandNotificationsRequest(isLoadingMore) {
  return {
    type: NOTIFICATIONS_EXPAND_REQUEST,
    skipLoading: !isLoadingMore,
  };
}

export function expandNotificationsSuccess(notifications, next, isLoadingMore, isLoadingRecent, usePendingItems) {
  return {
    type: NOTIFICATIONS_EXPAND_SUCCESS,
    notifications,
    next,
    isLoadingRecent: isLoadingRecent,
    usePendingItems,
    skipLoading: !isLoadingMore,
  };
}

export function expandNotificationsFail(error, isLoadingMore) {
  return {
    type: NOTIFICATIONS_EXPAND_FAIL,
    error,
    skipLoading: !isLoadingMore,
    skipAlert: !isLoadingMore || error.name === "AbortError",
  };
}

export function clearNotifications() {
  return (dispatch, getState) => {
    dispatch({
      type: NOTIFICATIONS_CLEAR,
    });

    api(getState).post("/api/v1/notifications/clear");
  };
}

export function scrollTopNotifications(top) {
  return {
    type: NOTIFICATIONS_SCROLL_TOP,
    top,
  };
}

export function deleteMarkedNotifications() {
  return (dispatch, getState) => {
    dispatch(deleteMarkedNotificationsRequest());

    let ids = [];
    getState().getIn(["notifications", "items"]).forEach((n) => {
      if (n.get("markedForDelete")) {
        ids.push(n.get("id"));
      }
    });

    if (ids.length === 0) {
      return;
    }

    api(getState).delete(`/api/v1/notifications/destroy_multiple?ids[]=${ids.join("&ids[]=")}`).then(() => {
      dispatch(deleteMarkedNotificationsSuccess());
    }).catch(error => {
      console.error(error);
      dispatch(deleteMarkedNotificationsFail(error));
    });
  };
}

export function enterNotificationClearingMode(yes) {
  return {
    type: NOTIFICATIONS_ENTER_CLEARING_MODE,
    yes: yes,
  };
}

export function markAllNotifications(yes) {
  return {
    type: NOTIFICATIONS_MARK_ALL_FOR_DELETE,
    yes: yes, // true, false or null. null = invert
  };
}

export function deleteMarkedNotificationsRequest() {
  return {
    type: NOTIFICATIONS_DELETE_MARKED_REQUEST,
  };
}

export function deleteMarkedNotificationsFail() {
  return {
    type: NOTIFICATIONS_DELETE_MARKED_FAIL,
  };
}

export function markNotificationForDelete(id, yes) {
  return {
    type: NOTIFICATION_MARK_FOR_DELETE,
    id: id,
    yes: yes,
  };
}

export function deleteMarkedNotificationsSuccess() {
  return {
    type: NOTIFICATIONS_DELETE_MARKED_SUCCESS,
  };
}

export function mountNotifications() {
  return {
    type: NOTIFICATIONS_MOUNT,
  };
}

export function unmountNotifications() {
  return {
    type: NOTIFICATIONS_UNMOUNT,
  };
}

export function notificationsSetVisibility(visibility) {
  return {
    type: NOTIFICATIONS_SET_VISIBILITY,
    visibility: visibility,
  };
}

export function setFilter (filterType) {
  return dispatch => {
    dispatch({
      type: NOTIFICATIONS_FILTER_SET,
      path: ["notifications", "quickFilter", "active"],
      value: filterType,
    });
    dispatch(expandNotifications({ forceLoad: true }));
    dispatch(saveSettings());
  };
}

export function markNotificationsAsRead() {
  return {
    type: NOTIFICATIONS_MARK_AS_READ,
  };
}

// Browser support
export function setupBrowserNotifications() {
  return dispatch => {
    dispatch(setBrowserSupport("Notification" in window));
    if ("Notification" in window) {
      dispatch(setBrowserPermission(Notification.permission));
    }

    if ("Notification" in window && "permissions" in navigator) {
      navigator.permissions.query({ name: "notifications" }).then((status) => {
        status.onchange = () => dispatch(setBrowserPermission(Notification.permission));
      }).catch(console.warn);
    }
  };
}

export function requestBrowserPermission(callback = noOp) {
  return dispatch => {
    requestNotificationPermission((permission) => {
      dispatch(setBrowserPermission(permission));
      callback(permission);

      if (permission === "granted") {
        dispatch(registerPushNotifications());
      }
    });
  };
}

export function setBrowserSupport (value) {
  return {
    type: NOTIFICATIONS_SET_BROWSER_SUPPORT,
    value,
  };
}

export function setBrowserPermission (value) {
  return {
    type: NOTIFICATIONS_SET_BROWSER_PERMISSION,
    value,
  };
}