/**
 * Copyright (c) 2023-present Plane Software, Inc. and contributors
 * SPDX-License-Identifier: AGPL-3.0-only
 * See the LICENSE file for details.
 */

import { useCallback, useEffect, useRef, useState } from "react";
import { observer } from "mobx-react";
import { useTranslation } from "@plane/i18n";
import { EmptyStateDetailed } from "@plane/propel/empty-state";
import type { TInboxIssueCurrentTab } from "@plane/types";
import { EInboxIssueCurrentTab } from "@plane/types";
import { EHeaderVariant, Header, Loader } from "@plane/ui";
import { cn } from "@plane/utils";
import { InboxSidebarLoader } from "@/components/ui/loader/layouts/project-inbox/inbox-sidebar-loader";
import { useProject } from "@/hooks/store/use-project";
import { useProjectInbox } from "@/hooks/store/use-project-inbox";
import { useAppRouter } from "@/hooks/use-app-router";
import { useIntersectionObserver } from "@/hooks/use-intersection-observer";
import { FiltersRoot } from "@/components/inbox/inbox-filter";
import { InboxIssueAppliedFilters } from "@/components/inbox/inbox-filter/applied-filters/root";
import { ExternalContoursListItem } from "./list-item";

type Props = {
  workspaceSlug: string;
  projectId: string;
  inboxIssueId: string | undefined;
  setIsMobileSidebar: (value: boolean) => void;
};

const tabNavigationOptions: { key: TInboxIssueCurrentTab; i18n_label: string }[] = [
  { key: EInboxIssueCurrentTab.OPEN, i18n_label: "external_contours_page.tabs.open" },
  { key: EInboxIssueCurrentTab.CLOSED, i18n_label: "external_contours_page.tabs.closed" },
];

export const ExternalContoursSidebar = observer(function ExternalContoursSidebar(props: Props) {
  const { workspaceSlug, projectId, inboxIssueId, setIsMobileSidebar } = props;
  const router = useAppRouter();
  const containerRef = useRef<HTMLDivElement>(null);
  const [elementRef, setElementRef] = useState<HTMLDivElement | null>(null);
  const { t } = useTranslation();
  const { currentProjectDetails } = useProject();
  const {
    currentTab,
    handleCurrentTab,
    loader,
    filteredInboxIssueIds,
    inboxIssuePaginationInfo,
    fetchInboxPaginationIssues,
    getAppliedFiltersCount,
  } = useProjectInbox();

  const fetchNextPages = useCallback(() => {
    if (!workspaceSlug || !projectId) return;
    fetchInboxPaginationIssues(workspaceSlug.toString(), projectId.toString());
  }, [workspaceSlug, projectId, fetchInboxPaginationIssues]);

  useIntersectionObserver(containerRef, elementRef, fetchNextPages, "20%");

  useEffect(() => {
    if (workspaceSlug && projectId && currentTab && filteredInboxIssueIds.length > 0 && inboxIssueId === undefined) {
      router.push(
        `/${workspaceSlug}/projects/${projectId}/external-contours?currentTab=${currentTab}&inboxIssueId=${filteredInboxIssueIds[0]}`
      );
    }
  }, [currentTab, filteredInboxIssueIds, inboxIssueId, projectId, router, workspaceSlug]);

  return (
    <div className="h-full w-full flex-shrink-0 border-r border-strong bg-surface-1">
      <div className="relative flex h-full w-full flex-col overflow-hidden">
        <Header variant={EHeaderVariant.SECONDARY}>
          {tabNavigationOptions.map((option) => (
            <div
              key={option.key}
              className={cn(
                "relative flex h-full cursor-pointer items-center gap-1 px-3 text-13 font-medium transition-all",
                currentTab === option.key ? "text-accent-primary" : "hover:text-secondary"
              )}
              onClick={() => {
                if (currentTab !== option.key) {
                  handleCurrentTab(workspaceSlug, projectId, option.key);
                  router.push(`/${workspaceSlug}/projects/${projectId}/external-contours?currentTab=${option.key}`);
                }
              }}
            >
              <div>{t(option.i18n_label)}</div>
              {option.key === EInboxIssueCurrentTab.OPEN && currentTab === option.key && (
                <div className="rounded-full bg-accent-primary/20 px-1.5 py-0.5 text-11 font-semibold text-accent-primary">
                  {inboxIssuePaginationInfo?.total_results || 0}
                </div>
              )}
              <div
                className={cn(
                  "absolute right-0 bottom-0 left-0 rounded-t-md border",
                  currentTab === option.key ? "border-accent-strong" : "border-transparent"
                )}
              />
            </div>
          ))}
          <div className="m-auto mr-0">
            <FiltersRoot />
          </div>
        </Header>

        <InboxIssueAppliedFilters />

        {loader === "filter-loading" && !inboxIssuePaginationInfo?.next_page_results ? (
          <InboxSidebarLoader />
        ) : (
          <div className="vertical-scrollbar scrollbar-md h-full w-full overflow-hidden overflow-y-auto" ref={containerRef}>
            {filteredInboxIssueIds.length > 0 ? (
              filteredInboxIssueIds.map((inboxId) => (
                <ExternalContoursListItem
                  key={inboxId}
                  setIsMobileSidebar={setIsMobileSidebar}
                  workspaceSlug={workspaceSlug}
                  projectId={projectId}
                  projectIdentifier={currentProjectDetails?.identifier}
                  inboxIssueId={inboxId}
                />
              ))
            ) : (
              <div className="flex h-full w-full items-center justify-center">
                {getAppliedFiltersCount > 0 ? (
                  <EmptyStateDetailed
                    assetKey="search"
                    title={t("external_contours_page.empty_state.filtered_title")}
                    description={t("external_contours_page.empty_state.filtered_description")}
                    assetClassName="size-20"
                    rootClassName="px-page-x"
                  />
                ) : currentTab === EInboxIssueCurrentTab.OPEN ? (
                  <EmptyStateDetailed
                    assetKey="inbox"
                    title={t("external_contours_page.empty_state.open_title")}
                    description={t("external_contours_page.empty_state.open_description")}
                    assetClassName="size-20"
                    rootClassName="px-page-x"
                  />
                ) : (
                  <EmptyStateDetailed
                    assetKey="inbox"
                    title={t("external_contours_page.empty_state.closed_title")}
                    description={t("external_contours_page.empty_state.closed_description")}
                    assetClassName="size-20"
                    className="px-10"
                  />
                )}
              </div>
            )}
            <div ref={setElementRef}>
              {inboxIssuePaginationInfo?.next_page_results && (
                <Loader className="mx-auto w-full space-y-4 px-2 py-4">
                  <Loader.Item height="64px" width="w-100" />
                  <Loader.Item height="64px" width="w-100" />
                </Loader>
              )}
            </div>
          </div>
        )}
      </div>
    </div>
  );
});
