plane/apps/app/components/core/board-view/board-header.tsx

import React from "react";

// icons
import { ArrowsPointingInIcon, ArrowsPointingOutIcon, PlusIcon } from "@heroicons/react/24/outline";
// helpers
import { addSpaceIfCamelCase } from "helpers/string.helper";
// types
import { IIssue, IProjectMember, IState, NestedKeyOf } from "types";
import { getStateGroupIcon } from "components/icons";
type Props = {
  groupedByIssues: {
    [key: string]: IIssue[];
  };
  currentState?: IState | null;
  selectedGroup: NestedKeyOf<IIssue> | null;
  groupTitle: string;
  bgColor?: string;
  addIssueToState: () => void;
  members: IProjectMember[] | undefined;
  isCollapsed: boolean;
  setIsCollapsed: React.Dispatch<React.SetStateAction<boolean>>;
};

export const BoardHeader: React.FC<Props> = ({
  groupedByIssues,
  currentState,
  selectedGroup,
  groupTitle,
  bgColor,
  addIssueToState,
  isCollapsed,
  setIsCollapsed,
  members,
}) => {
  const createdBy =
    selectedGroup === "created_by"
      ? members?.find((m) => m.member.id === groupTitle)?.member.first_name ?? "loading..."
      : null;

  let assignees: any;
  if (selectedGroup === "assignees") {
    assignees = groupTitle && groupTitle !== "" ? groupTitle.split(",") : [];
    assignees =
      assignees.length > 0
        ? assignees
            .map((a: string) => members?.find((m) => m.member.id === a)?.member.first_name)
            .join(", ")
        : "No assignee";
  }

  return (
    <div
      className={`flex justify-between px-1 ${
        !isCollapsed ? "flex-col rounded-md border bg-gray-50" : ""
      }`}
    >
      <div className={`flex items-center ${!isCollapsed ? "flex-col gap-2" : "gap-1"}`}>
        <div
          className={`flex cursor-pointer items-center gap-x-3.5 ${
            !isCollapsed ? "mb-2 flex-col gap-y-2 py-2" : ""
          }`}
        >
          {currentState && getStateGroupIcon(currentState.group, "20", "20", bgColor)}
          <h2
            className={`text-xl font-semibold capitalize`}
            style={{
              writingMode: !isCollapsed ? "vertical-rl" : "horizontal-tb",
            }}
          >
            {selectedGroup === "created_by"
              ? createdBy
              : selectedGroup === "assignees"
              ? assignees
              : addSpaceIfCamelCase(groupTitle)}
          </h2>
          <span className="ml-0.5 text-sm bg-gray-100 py-1 px-3 rounded-full">
            {groupedByIssues[groupTitle].length}
          </span>
        </div>
      </div>

      <div className={`flex items-center ${!isCollapsed ? "flex-col pb-2" : ""}`}>
        <button
          type="button"
          className="grid h-7 w-7 place-items-center rounded p-1 text-gray-700 outline-none duration-300 hover:bg-gray-100"
          onClick={() => {
            setIsCollapsed((prevData) => !prevData);
          }}
        >
          {isCollapsed ? (
            <ArrowsPointingInIcon className="h-4 w-4" />
          ) : (
            <ArrowsPointingOutIcon className="h-4 w-4" />
          )}
        </button>
        <button
          type="button"
          className="grid h-7 w-7 place-items-center rounded p-1 text-gray-700 outline-none duration-300 hover:bg-gray-100"
          onClick={addIssueToState}
        >
          <PlusIcon className="h-4 w-4" />
        </button>
      </div>
    </div>
  );
};