import { FC, useCallback } from "react";
import { observer } from "mobx-react";
import { useRouter } from "next/router";
// types
import { IIssueDisplayFilterOptions, IIssueDisplayProperties, IIssueFilterOptions, TIssueLayouts } from "@plane/types";
// ui
import { Breadcrumbs, LayersIcon, Tooltip } from "@plane/ui";
// components
import { BreadcrumbLink, Logo } from "@/components/common";
import { DisplayFiltersSelection, FiltersDropdown, FilterSelection, LayoutSelection } from "@/components/issues";
// constants
import { EIssueFilterType, EIssuesStoreType, ISSUE_DISPLAY_FILTERS_BY_LAYOUT } from "@/constants/issue";
// helpers
import { calculateTotalFilters } from "@/helpers/filter.helper";
// hooks
import { useIssues, useLabel, useMember, useProject, useProjectState } from "@/hooks/store";
import { usePlatformOS } from "@/hooks/use-platform-os";

export const ProjectDraftIssueHeader: FC = observer(() => {
  // router
  const router = useRouter();
  const { workspaceSlug, projectId } = router.query as { workspaceSlug: string; projectId: string };
  // store hooks
  const {
    issuesFilter: { issueFilters, updateFilters },
  } = useIssues(EIssuesStoreType.DRAFT);
  const { currentProjectDetails } = useProject();
  const { projectStates } = useProjectState();
  const { projectLabels } = useLabel();
  const {
    project: { projectMemberIds },
  } = useMember();
  const { isMobile } = usePlatformOS();
  const activeLayout = issueFilters?.displayFilters?.layout;

  const handleFiltersUpdate = useCallback(
    (key: keyof IIssueFilterOptions, value: string | string[]) => {
      if (!workspaceSlug || !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(workspaceSlug, projectId, EIssueFilterType.FILTERS, { [key]: newValues });
    },
    [workspaceSlug, projectId, issueFilters, updateFilters]
  );

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

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

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

  const issueCount = currentProjectDetails
    ? !issueFilters?.displayFilters?.sub_issue && currentProjectDetails.draft_sub_issues
      ? currentProjectDetails.draft_issues - currentProjectDetails.draft_sub_issues
      : currentProjectDetails.draft_issues
    : undefined;

  const isFiltersApplied = calculateTotalFilters(issueFilters?.filters ?? {}) !== 0;

  return (
    <div className="relative z-10 flex h-[3.75rem] w-full flex-shrink-0 flex-row items-center justify-between gap-x-2 gap-y-4 bg-custom-sidebar-background-100 p-4">
      <div className="flex w-full flex-grow items-center gap-2 overflow-ellipsis whitespace-nowrap">
        <div className="flex items-center gap-2.5">
          <Breadcrumbs>
            <Breadcrumbs.BreadcrumbItem
              type="text"
              link={
                <BreadcrumbLink
                  href={`/${workspaceSlug}/projects`}
                  label={currentProjectDetails?.name ?? "Project"}
                  icon={
                    currentProjectDetails && (
                      <span className="grid place-items-center flex-shrink-0 h-4 w-4">
                        <Logo logo={currentProjectDetails?.logo_props} size={16} />
                      </span>
                    )
                  }
                />
              }
            />

            <Breadcrumbs.BreadcrumbItem
              type="text"
              link={
                <BreadcrumbLink label="Draft Issues" icon={<LayersIcon className="h-4 w-4 text-custom-text-300" />} />
              }
            />
          </Breadcrumbs>
          {issueCount && issueCount > 0 ? (
            <Tooltip
              isMobile={isMobile}
              tooltipContent={`There are ${issueCount} ${issueCount > 1 ? "issues" : "issue"} in project's draft`}
              position="bottom"
            >
              <span className="cursor-default flex items-center text-center justify-center px-2.5 py-0.5 flex-shrink-0 bg-custom-primary-100/20 text-custom-primary-100 text-xs font-semibold rounded-xl">
                {issueCount}
              </span>
            </Tooltip>
          ) : null}
        </div>

        <div className="ml-auto flex items-center gap-2">
          <LayoutSelection
            layouts={["list", "kanban"]}
            onChange={(layout) => handleLayoutChange(layout)}
            selectedLayout={activeLayout}
          />
          <FiltersDropdown title="Filters" placement="bottom-end" isFiltersApplied={isFiltersApplied}>
            <FilterSelection
              filters={issueFilters?.filters ?? {}}
              handleFiltersUpdate={handleFiltersUpdate}
              displayFilters={issueFilters?.displayFilters ?? {}}
              handleDisplayFiltersUpdate={handleDisplayFilters}
              layoutDisplayFiltersOptions={
                activeLayout ? ISSUE_DISPLAY_FILTERS_BY_LAYOUT.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_LAYOUT.issues[activeLayout] : undefined
              }
              displayFilters={issueFilters?.displayFilters ?? {}}
              handleDisplayFiltersUpdate={handleDisplayFilters}
              displayProperties={issueFilters?.displayProperties ?? {}}
              handleDisplayPropertiesUpdate={handleDisplayProperties}
              cycleViewDisabled={!currentProjectDetails?.cycle_view}
              moduleViewDisabled={!currentProjectDetails?.module_view}
            />
          </FiltersDropdown>
        </div>
      </div>
    </div>
  );
});
