import { useCallback, useRef, useState } from "react";
import { observer } from "mobx-react-lite";
import { Search, Plus, Briefcase, X, ListFilter } from "lucide-react";
import { TProjectFilters } from "@plane/types";
// hooks
// components
// ui
import { Breadcrumbs, Button } from "@plane/ui";
import { BreadcrumbLink } from "@/components/common";
// helpers
// constants
import { FiltersDropdown } from "@/components/issues";
import { ProjectFiltersSelection, ProjectOrderByDropdown } from "@/components/project";
import { EUserWorkspaceRoles } from "@/constants/workspace";
import { cn } from "@/helpers/common.helper";
import { useApplication, useEventTracker, useMember, useProject, useProjectFilter, useUser } from "@/hooks/store";
import useOutsideClickDetector from "@/hooks/use-outside-click-detector";

export const ProjectsHeader = observer(() => {
  // states
  const [isSearchOpen, setIsSearchOpen] = useState(false);
  // refs
  const inputRef = useRef<HTMLInputElement>(null);
  // store hooks
  const {
    commandPalette: commandPaletteStore,
    router: { workspaceSlug },
  } = useApplication();
  const { setTrackElement } = useEventTracker();
  const {
    membership: { currentWorkspaceRole },
  } = useUser();
  const { workspaceProjectIds } = useProject();
  const {
    currentWorkspaceDisplayFilters: displayFilters,
    currentWorkspaceFilters: filters,
    updateFilters,
    updateDisplayFilters,
    searchQuery,
    updateSearchQuery,
  } = useProjectFilter();
  const {
    workspace: { workspaceMemberIds },
  } = useMember();
  // outside click detector hook
  useOutsideClickDetector(inputRef, () => {
    if (isSearchOpen && searchQuery.trim() === "") setIsSearchOpen(false);
  });
  // auth
  const isAuthorizedUser = !!currentWorkspaceRole && currentWorkspaceRole >= EUserWorkspaceRoles.MEMBER;

  const handleFilters = useCallback(
    (key: keyof TProjectFilters, value: string | string[]) => {
      if (!workspaceSlug) return;
      const newValues = filters?.[key] ?? [];

      if (Array.isArray(value))
        value.forEach((val) => {
          if (!newValues.includes(val)) newValues.push(val);
          else newValues.splice(newValues.indexOf(val), 1);
        });
      else {
        if (filters?.[key]?.includes(value)) newValues.splice(newValues.indexOf(value), 1);
        else newValues.push(value);
      }

      updateFilters(workspaceSlug, { [key]: newValues });
    },
    [filters, updateFilters, workspaceSlug]
  );

  const handleInputKeyDown = (e: React.KeyboardEvent<HTMLInputElement>) => {
    if (e.key === "Escape") {
      if (searchQuery && searchQuery.trim() !== "") updateSearchQuery("");
      else setIsSearchOpen(false);
    }
  };

  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 flex-grow items-center gap-2 overflow-ellipsis whitespace-nowrap">
        <div>
          <Breadcrumbs>
            <Breadcrumbs.BreadcrumbItem
              type="text"
              link={<BreadcrumbLink label="Projects" icon={<Briefcase className="h-4 w-4 text-custom-text-300" />} />}
            />
          </Breadcrumbs>
        </div>
      </div>
      <div className="w-full flex items-center justify-end gap-3">
        {workspaceProjectIds && workspaceProjectIds?.length > 0 && (
          <div className="flex items-center">
            {!isSearchOpen && (
              <button
                type="button"
                className="-mr-1 p-2 hover:bg-custom-background-80 rounded text-custom-text-400 grid place-items-center"
                onClick={() => {
                  setIsSearchOpen(true);
                  inputRef.current?.focus();
                }}
              >
                <Search className="h-3.5 w-3.5" />
              </button>
            )}
            <div
              className={cn(
                "ml-auto flex items-center justify-start gap-1 rounded-md border border-transparent bg-custom-background-100 text-custom-text-400 w-0 transition-[width] ease-linear overflow-hidden opacity-0",
                {
                  "w-64 px-2.5 py-1.5 border-custom-border-200 opacity-100": isSearchOpen,
                }
              )}
            >
              <Search className="h-3.5 w-3.5" />
              <input
                ref={inputRef}
                className="w-full max-w-[234px] border-none bg-transparent text-sm text-custom-text-100 focus:outline-none"
                placeholder="Search"
                value={searchQuery}
                onChange={(e) => updateSearchQuery(e.target.value)}
                onKeyDown={handleInputKeyDown}
              />
              {isSearchOpen && (
                <button
                  type="button"
                  className="grid place-items-center"
                  onClick={() => {
                    updateSearchQuery("");
                    setIsSearchOpen(false);
                  }}
                >
                  <X className="h-3 w-3" />
                </button>
              )}
            </div>
          </div>
        )}
        <ProjectOrderByDropdown
          value={displayFilters?.order_by}
          onChange={(val) => {
            if (!workspaceSlug || val === displayFilters?.order_by) return;
            updateDisplayFilters(workspaceSlug, {
              order_by: val,
            });
          }}
        />
        <FiltersDropdown icon={<ListFilter className="h-3 w-3" />} title="Filters" placement="bottom-end">
          <ProjectFiltersSelection
            displayFilters={displayFilters ?? {}}
            filters={filters ?? {}}
            handleFiltersUpdate={handleFilters}
            handleDisplayFiltersUpdate={(val) => {
              if (!workspaceSlug) return;
              updateDisplayFilters(workspaceSlug, val);
            }}
            memberIds={workspaceMemberIds ?? undefined}
          />
        </FiltersDropdown>
        {isAuthorizedUser && (
          <Button
            prependIcon={<Plus />}
            size="sm"
            onClick={() => {
              setTrackElement("Projects page");
              commandPaletteStore.toggleCreateProjectModal(true);
            }}
            className="items-center gap-1"
          >
            <span className="hidden sm:inline-block">Add</span> Project
          </Button>
        )}
      </div>
    </div>
  );
});