plane/web/components/issues/issue-layouts/properties/assignee.tsx

import { FC, useRef, useState } from "react";
import { Combobox } from "@headlessui/react";
import { ChevronDown, Search, X, Check } from "lucide-react";
import { observer } from "mobx-react-lite";
// components
import { Tooltip } from "@plane/ui";
// hooks
import useDynamicDropdownPosition from "hooks/use-dynamic-dropdown";

interface IFiltersOption {
  id: string;
  title: string;
  avatar: string;
}

export interface IIssuePropertyAssignee {
  value?: any;
  onChange?: (id: any, data: any) => void;
  disabled?: boolean;
  list?: any;

  className?: string;
  buttonClassName?: string;
  optionsClassName?: string;
  dropdownArrow?: boolean;
}

export const IssuePropertyAssignee: FC<IIssuePropertyAssignee> = observer((props) => {
  const { value, onChange, disabled, list, className, buttonClassName, optionsClassName, dropdownArrow = true } = props;

  const dropdownBtn = useRef<any>(null);
  const dropdownOptions = useRef<any>(null);

  const [isOpen, setIsOpen] = useState<boolean>(false);
  const [search, setSearch] = useState<string>("");

  const options: IFiltersOption[] | [] =
    (list &&
      list?.length > 0 &&
      list.map((_member: any) => ({
        id: _member?.member?.id,
        title: _member?.member?.display_name,
        avatar: _member?.member?.avatar && _member?.member?.avatar !== "" ? _member?.member?.avatar : null,
      }))) ||
    [];

  useDynamicDropdownPosition(isOpen, () => setIsOpen(false), dropdownBtn, dropdownOptions);

  const selectedOption: IFiltersOption[] =
    (value && value?.length > 0 && options.filter((_member: IFiltersOption) => value.includes(_member.id))) || [];

  const filteredOptions: IFiltersOption[] =
    search === ""
      ? options && options.length > 0
        ? options
        : []
      : options && options.length > 0
      ? options.filter((_member: IFiltersOption) =>
          _member.title.toLowerCase().replace(/\s+/g, "").includes(search.toLowerCase().replace(/\s+/g, ""))
        )
      : [];

  const assigneeRenderLength = 5;

  return (
    <Combobox
      multiple={true}
      as="div"
      className={`${className}`}
      value={selectedOption.map((_member: IFiltersOption) => _member.id) as string[]}
      onChange={(data: string[]) => {
        if (onChange && selectedOption) onChange(data, selectedOption);
      }}
      disabled={disabled}
    >
      {({ open }: { open: boolean }) => {
        if (open) {
          if (!isOpen) setIsOpen(true);
        } else if (isOpen) setIsOpen(false);

        return (
          <>
            <Combobox.Button
              ref={dropdownBtn}
              type="button"
              className={`flex items-center justify-between gap-1 px-1 py-0.5 rounded-sm shadow-sm border border-custom-border-300 duration-300 outline-none ${
                disabled ? "cursor-not-allowed text-custom-text-200" : "cursor-pointer hover:bg-custom-background-80"
              } ${buttonClassName}`}
            >
              {selectedOption && selectedOption?.length > 0 ? (
                <>
                  {selectedOption?.length > 1 ? (
                    <Tooltip
                      tooltipHeading={`Assignees`}
                      tooltipContent={(selectedOption.map((_label: IFiltersOption) => _label.title) || []).join(", ")}
                    >
                      <div className="flex-shrink-0 flex justify-center items-center gap-1 pr-[8px]">
                        {selectedOption.slice(0, assigneeRenderLength).map((_assignee) => (
                          <div
                            key={_assignee?.id}
                            className="flex-shrink-0 w-[16px] h-[16px] rounded-sm bg-gray-700 flex justify-center items-center text-white capitalize relative -mr-[8px] text-xs overflow-hidden border border-custom-border-300"
                          >
                            {_assignee && _assignee.avatar ? (
                              <img
                                src={_assignee.avatar}
                                className="absolute top-0 left-0 h-full w-full object-cover"
                                alt={_assignee.title}
                              />
                            ) : (
                              _assignee.title[0]
                            )}
                          </div>
                        ))}
                        {selectedOption.length > assigneeRenderLength && (
                          <div className="flex-shrink-0 h-[16px] px-0.5 rounded-sm bg-gray-700 flex justify-center items-center text-white capitalize relative -mr-[8px] text-xs overflow-hidden border border-custom-border-300">
                            +{selectedOption?.length - assigneeRenderLength}
                          </div>
                        )}
                      </div>
                    </Tooltip>
                  ) : (
                    <Tooltip
                      tooltipHeading={`Assignees`}
                      tooltipContent={(selectedOption.map((_label: IFiltersOption) => _label.title) || []).join(", ")}
                    >
                      <div className="flex-shrink-0 flex justify-center items-center gap-1 text-xs">
                        <div className="flex-shrink-0 w-4 h-4 rounded-sm flex justify-center items-center text-white capitalize relative overflow-hidden text-xs">
                          {selectedOption[0] && selectedOption[0].avatar ? (
                            <img
                              src={selectedOption[0].avatar}
                              className="absolute top-0 left-0 h-full w-full object-cover"
                              alt={selectedOption[0].title}
                            />
                          ) : (
                            <div className="w-full h-full bg-gray-700 flex justify-center items-center">
                              {selectedOption[0].title[0]}
                            </div>
                          )}
                        </div>
                        <div className="line-clamp-1">{selectedOption[0].title}</div>
                      </div>
                    </Tooltip>
                  )}
                </>
              ) : (
                <Tooltip tooltipHeading={`Assignees`} tooltipContent={``}>
                  <div className="text-xs">Select Assignees</div>
                </Tooltip>
              )}

              {dropdownArrow && !disabled && (
                <div className="flex-shrink-0 w-[14px] h-[14px] flex justify-center items-center">
                  <ChevronDown width={14} strokeWidth={2} />
                </div>
              )}
            </Combobox.Button>

            <div className={`${open ? "fixed z-20 top-0 left-0 h-full w-full cursor-auto" : ""}`}>
              <Combobox.Options
                ref={dropdownOptions}
                className={`absolute z-10 border border-custom-border-300 p-2 rounded bg-custom-background-100 text-xs shadow-lg focus:outline-none whitespace-nowrap mt-1 space-y-1 ${optionsClassName}`}
              >
                {options && options.length > 0 ? (
                  <>
                    <div className="flex w-full items-center justify-start rounded border border-custom-border-200 bg-custom-background-90 px-1">
                      <div className="flex-shrink-0 flex justify-center items-center w-[16px] h-[16px] rounded-sm">
                        <Search width={12} strokeWidth={2} />
                      </div>

                      <div>
                        <Combobox.Input
                          className="w-full bg-transparent p-1 text-xs text-custom-text-200 placeholder:text-custom-text-400 focus:outline-none"
                          value={search}
                          onChange={(e) => setSearch(e.target.value)}
                          placeholder="Search"
                          displayValue={(assigned: any) => assigned?.name}
                        />
                      </div>

                      {search && search.length > 0 && (
                        <div
                          onClick={() => setSearch("")}
                          className="flex-shrink-0 flex justify-center items-center w-[16px] h-[16px] rounded-sm cursor-pointer hover:bg-custom-background-80"
                        >
                          <X width={12} strokeWidth={2} />
                        </div>
                      )}
                    </div>

                    <div className={`space-y-0.5 max-h-48 overflow-y-scroll`}>
                      {filteredOptions ? (
                        filteredOptions.length > 0 ? (
                          filteredOptions.map((option) => (
                            <Combobox.Option
                              key={option.id}
                              value={option.id}
                              className={({ active }) =>
                                `cursor-pointer select-none truncate rounded px-1 py-1.5 ${
                                  active || (value && value.length > 0 && value.includes(option?.id))
                                    ? "bg-custom-background-80"
                                    : ""
                                } ${
                                  value && value.length > 0 && value.includes(option?.id)
                                    ? "text-custom-text-100"
                                    : "text-custom-text-200"
                                }`
                              }
                            >
                              <div className="flex items-center gap-1 w-full px-1">
                                <div className="flex-shrink-0 w-[18px] h-[18px] rounded-sm flex justify-center items-center text-white capitalize relative overflow-hidden">
                                  {option && option.avatar ? (
                                    <img
                                      src={option.avatar}
                                      className="absolute top-0 left-0 h-full w-full object-cover"
                                      alt={option.title}
                                    />
                                  ) : (
                                    <div className="w-full h-full bg-gray-700 flex justify-center items-center">
                                      {option.title[0]}
                                    </div>
                                  )}
                                </div>
                                <div className="line-clamp-1">{option.title}</div>
                                {value && value.length > 0 && value.includes(option?.id) && (
                                  <div className="flex-shrink-0 ml-auto w-[13px] h-[13px] flex justify-center items-center">
                                    <Check width={13} strokeWidth={2} />
                                  </div>
                                )}
                              </div>
                            </Combobox.Option>
                          ))
                        ) : (
                          <span className="flex items-center gap-2 p-1">
                            <p className="text-left text-custom-text-200 ">No matching results</p>
                          </span>
                        )
                      ) : (
                        <p className="text-center text-custom-text-200">Loading...</p>
                      )}
                    </div>
                  </>
                ) : (
                  <p className="text-center text-custom-text-200">No options available.</p>
                )}
              </Combobox.Options>
            </div>
          </>
        );
      }}
    </Combobox>
  );
});