"use client";

import { useCallback, useRef, useState } from "react";
import { observer } from "mobx-react";
import Link from "next/link";
import { useParams } from "next/navigation";
// icons
import { PanelRight } from "lucide-react";
// plane constants
import {
  EIssueLayoutTypes,
  EIssuesStoreType,
  EIssueFilterType,
  ISSUE_DISPLAY_FILTERS_BY_PAGE,
  EUserPermissions,
  EUserPermissionsLevel,
} from "@plane/constants";
// types
import {
  ICustomSearchSelectOption,
  IIssueDisplayFilterOptions,
  IIssueDisplayProperties,
  IIssueFilterOptions,
} from "@plane/types";
// ui
import { Breadcrumbs, Button, DiceIcon, Tooltip, Header, CustomSearchSelect } from "@plane/ui";
// components
import { WorkItemsModal } from "@/components/analytics/work-items/modal";
import { BreadcrumbLink, SwitcherLabel } from "@/components/common";
import { DisplayFiltersSelection, FiltersDropdown, FilterSelection, LayoutSelection } from "@/components/issues";
// helpers
import { ModuleQuickActions } from "@/components/modules";
import { cn } from "@/helpers/common.helper";
import { isIssueFilterActive } from "@/helpers/filter.helper";
// hooks
import {
  useEventTracker,
  useLabel,
  useMember,
  useModule,
  useProject,
  useProjectState,
  useIssues,
  useCommandPalette,
  useUserPermissions,
} from "@/hooks/store";
import { useAppRouter } from "@/hooks/use-app-router";
import { useIssuesActions } from "@/hooks/use-issues-actions";
import useLocalStorage from "@/hooks/use-local-storage";
import { usePlatformOS } from "@/hooks/use-platform-os";
// plane web
import { ProjectBreadcrumb } from "@/plane-web/components/breadcrumbs";

export const ModuleIssuesHeader: React.FC = observer(() => {
  // refs
  const parentRef = useRef<HTMLDivElement>(null);
  // states
  const [analyticsModal, setAnalyticsModal] = useState(false);
  // router
  const router = useAppRouter();
  const { workspaceSlug, projectId, moduleId } = useParams();
  // hooks
  const { isMobile } = usePlatformOS();
  // store hooks
  const {
    issuesFilter: { issueFilters },
    issues: { getGroupIssueCount },
  } = useIssues(EIssuesStoreType.MODULE);
  const { updateFilters } = useIssuesActions(EIssuesStoreType.MODULE);
  const { projectModuleIds, getModuleById } = useModule();
  const { toggleCreateIssueModal } = useCommandPalette();
  const { setTrackElement } = useEventTracker();
  const { allowPermissions } = useUserPermissions();
  const { currentProjectDetails, loader } = useProject();
  const { projectLabels } = useLabel();
  const { projectStates } = useProjectState();
  const {
    project: { projectMemberIds },
  } = useMember();

  const { setValue, storedValue } = useLocalStorage("module_sidebar_collapsed", "false");

  const isSidebarCollapsed = storedValue ? (storedValue === "true" ? true : false) : false;
  const toggleSidebar = () => {
    setValue(`${!isSidebarCollapsed}`);
  };

  const activeLayout = issueFilters?.displayFilters?.layout;

  const handleLayoutChange = useCallback(
    (layout: EIssueLayoutTypes) => {
      if (!projectId) return;
      updateFilters(projectId.toString(), EIssueFilterType.DISPLAY_FILTERS, { layout: layout });
    },
    [projectId, updateFilters]
  );

  const handleFiltersUpdate = useCallback(
    (key: keyof IIssueFilterOptions, value: string | string[]) => {
      if (!projectId) return;
      const newValues = issueFilters?.filters?.[key] ?? [];

      if (Array.isArray(value)) {
        // this validation is majorly for the filter start_date, target_date custom
        value.forEach((val) => {
          if (!newValues.includes(val)) newValues.push(val);
          else newValues.splice(newValues.indexOf(val), 1);
        });
      } else {
        if (issueFilters?.filters?.[key]?.includes(value)) newValues.splice(newValues.indexOf(value), 1);
        else newValues.push(value);
      }

      updateFilters(projectId.toString(), EIssueFilterType.FILTERS, { [key]: newValues });
    },
    [projectId, issueFilters, updateFilters]
  );

  const handleDisplayFilters = useCallback(
    (updatedDisplayFilter: Partial<IIssueDisplayFilterOptions>) => {
      if (!projectId) return;
      updateFilters(projectId.toString(), EIssueFilterType.DISPLAY_FILTERS, updatedDisplayFilter);
    },
    [projectId, updateFilters]
  );

  const handleDisplayProperties = useCallback(
    (property: Partial<IIssueDisplayProperties>) => {
      if (!projectId) return;
      updateFilters(projectId.toString(), EIssueFilterType.DISPLAY_PROPERTIES, property);
    },
    [projectId, updateFilters]
  );

  // derived values
  const moduleDetails = moduleId ? getModuleById(moduleId.toString()) : undefined;
  const canUserCreateIssue = allowPermissions(
    [EUserPermissions.ADMIN, EUserPermissions.MEMBER],
    EUserPermissionsLevel.PROJECT
  );

  const workItemsCount = getGroupIssueCount(undefined, undefined, false);

  const switcherOptions = projectModuleIds
    ?.map((id) => {
      const _module = id === moduleId ? moduleDetails : getModuleById(id);
      if (!_module) return;
      return {
        value: _module.id,
        query: _module.name,
        content: <SwitcherLabel name={_module.name} LabelIcon={DiceIcon} />,
      };
    })
    .filter((option) => option !== undefined) as ICustomSearchSelectOption[];

  return (
    <>
      <WorkItemsModal
        isOpen={analyticsModal}
        onClose={() => setAnalyticsModal(false)}
        moduleDetails={moduleDetails ?? undefined}
        projectDetails={currentProjectDetails}
      />
      <Header>
        <Header.LeftItem>
          <Breadcrumbs onBack={router.back} isLoading={loader === "init-loader"}>
            <Breadcrumbs.BreadcrumbItem
              type="text"
              link={
                <span>
                  <span className="hidden md:block">
                    <ProjectBreadcrumb />
                  </span>
                  <Link
                    href={`/${workspaceSlug}/projects/${currentProjectDetails?.id}/issues`}
                    className="block pl-2 text-custom-text-300 md:hidden"
                  >
                    ...
                  </Link>
                </span>
              }
            />
            <Breadcrumbs.BreadcrumbItem
              type="text"
              link={
                <BreadcrumbLink
                  href={`/${workspaceSlug}/projects/${projectId}/modules`}
                  label="Modules"
                  icon={<DiceIcon className="h-4 w-4 text-custom-text-300" />}
                />
              }
            />
            <Breadcrumbs.BreadcrumbItem
              type="component"
              component={
                <CustomSearchSelect
                  options={switcherOptions}
                  label={
                    <div className="flex items-center gap-1">
                      <SwitcherLabel name={moduleDetails?.name} LabelIcon={DiceIcon} />
                      {workItemsCount && workItemsCount > 0 ? (
                        <Tooltip
                          isMobile={isMobile}
                          tooltipContent={`There are ${workItemsCount} ${
                            workItemsCount > 1 ? "work items" : "work item"
                          } in this module`}
                          position="bottom"
                        >
                          <span className="flex flex-shrink-0 cursor-default items-center justify-center rounded-xl bg-custom-primary-100/20 px-2 text-center text-xs font-semibold text-custom-primary-100">
                            {workItemsCount}
                          </span>
                        </Tooltip>
                      ) : null}
                    </div>
                  }
                  value={moduleId}
                  onChange={(value: string) => {
                    router.push(`/${workspaceSlug}/projects/${projectId}/modules/${value}`);
                  }}
                />
              }
            />
          </Breadcrumbs>
        </Header.LeftItem>
        <Header.RightItem className="items-center">
          <div className="hidden gap-2 md:flex">
            <LayoutSelection
              layouts={[
                EIssueLayoutTypes.LIST,
                EIssueLayoutTypes.KANBAN,
                EIssueLayoutTypes.CALENDAR,
                EIssueLayoutTypes.SPREADSHEET,
                EIssueLayoutTypes.GANTT,
              ]}
              onChange={(layout) => handleLayoutChange(layout)}
              selectedLayout={activeLayout}
            />
            <FiltersDropdown
              title="Filters"
              placement="bottom-end"
              isFiltersApplied={isIssueFilterActive(issueFilters)}
            >
              <FilterSelection
                filters={issueFilters?.filters ?? {}}
                handleFiltersUpdate={handleFiltersUpdate}
                displayFilters={issueFilters?.displayFilters ?? {}}
                handleDisplayFiltersUpdate={handleDisplayFilters}
                layoutDisplayFiltersOptions={
                  activeLayout ? ISSUE_DISPLAY_FILTERS_BY_PAGE.issues[activeLayout] : undefined
                }
                labels={projectLabels}
                memberIds={projectMemberIds ?? undefined}
                states={projectStates}
                cycleViewDisabled={!currentProjectDetails?.cycle_view}
                moduleViewDisabled={!currentProjectDetails?.module_view}
              />
            </FiltersDropdown>
            <FiltersDropdown title="Display" placement="bottom-end">
              <DisplayFiltersSelection
                layoutDisplayFiltersOptions={
                  activeLayout ? ISSUE_DISPLAY_FILTERS_BY_PAGE.issues[activeLayout] : undefined
                }
                displayFilters={issueFilters?.displayFilters ?? {}}
                handleDisplayFiltersUpdate={handleDisplayFilters}
                displayProperties={issueFilters?.displayProperties ?? {}}
                handleDisplayPropertiesUpdate={handleDisplayProperties}
                ignoreGroupedFilters={["module"]}
                cycleViewDisabled={!currentProjectDetails?.cycle_view}
                moduleViewDisabled={!currentProjectDetails?.module_view}
              />
            </FiltersDropdown>
          </div>

          {canUserCreateIssue ? (
            <>
              <Button
                className="hidden md:block"
                onClick={() => setAnalyticsModal(true)}
                variant="neutral-primary"
                size="sm"
              >
                Analytics
              </Button>
              <Button
                className="hidden sm:flex"
                onClick={() => {
                  setTrackElement("Module work items page");
                  toggleCreateIssueModal(true, EIssuesStoreType.MODULE);
                }}
                size="sm"
              >
                Add work item
              </Button>
            </>
          ) : (
            <></>
          )}
          <button
            type="button"
            className="p-1.5 rounded outline-none hover:bg-custom-sidebar-background-80 bg-custom-background-80/70"
            onClick={toggleSidebar}
          >
            <PanelRight className={cn("h-4 w-4", !isSidebarCollapsed ? "text-[#3E63DD]" : "text-custom-text-200")} />
          </button>
          <ModuleQuickActions
            parentRef={parentRef}
            moduleId={moduleId?.toString()}
            projectId={projectId.toString()}
            workspaceSlug={workspaceSlug.toString()}
            customClassName="flex-shrink-0 flex items-center justify-center bg-custom-background-80/70 rounded size-[26px]"
          />
        </Header.RightItem>
      </Header>
    </>
  );
});
