impress/src/app/WardrobePage/Item.js

import React from "react";
import { css, cx } from "emotion";
import {
  Box,
  Flex,
  IconButton,
  Skeleton,
  Tooltip,
  useColorModeValue,
  useTheme,
} from "@chakra-ui/core";
import { EditIcon, DeleteIcon, InfoIcon } from "@chakra-ui/icons";
import { Link } from "react-router-dom";
import loadable from "@loadable/component";

import {
  ItemCardContent,
  ItemBadgeList,
  MaybeAnimatedBadge,
  NcBadge,
  NpBadge,
  YouOwnThisBadge,
  YouWantThisBadge,
  getZoneBadges,
} from "../components/ItemCard";
import SupportOnly from "./support/SupportOnly";
import useSupport from "./support/useSupport";

const LoadableItemPageDrawer = loadable(() => import("../ItemPageDrawer"));
const LoadableItemSupportDrawer = loadable(() =>
  import("./support/ItemSupportDrawer")
);

/**
 * Item show a basic summary of an item, in the context of the current outfit!
 *
 * It also responds to the focus state of an `input` as its previous sibling.
 * This will be an invisible radio/checkbox that controls the actual wear
 * state.
 *
 * In fact, this component can't trigger wear or unwear events! When you click
 * it in the app, you're actually clicking a <label> that wraps the radio or
 * checkbox. Similarly, the parent provides the `onRemove` callback for the
 * Remove button.
 *
 * NOTE: This component is memoized with React.memo. It's surpisingly expensive
 *       to re-render, because Chakra components are a lil bit expensive from
 *       their internal complexity, and we have a lot of them here. And it can
 *       add up when there's a lot of Items in the list. This contributes to
 *       wearing/unwearing items being noticeably slower on lower-power
 *       devices.
 */
function Item({
  item,
  itemNameId,
  isWorn,
  isInOutfit,
  onRemove,
  isDisabled = false,
}) {
  const [infoDrawerIsOpen, setInfoDrawerIsOpen] = React.useState(false);
  const [supportDrawerIsOpen, setSupportDrawerIsOpen] = React.useState(false);

  return (
    <>
      <ItemContainer isDisabled={isDisabled}>
        <Box flex="1 1 0" minWidth="0">
          <ItemCardContent
            item={item}
            badges={<ItemBadges item={item} />}
            itemNameId={itemNameId}
            isWorn={isWorn}
            isDiabled={isDisabled}
            focusSelector={containerHasFocus}
          />
        </Box>
        <Box flex="0 0 auto" marginTop="5px">
          {isInOutfit && (
            <ItemActionButton
              icon={<DeleteIcon />}
              label="Remove"
              onClick={(e) => {
                onRemove(item.id);
                e.preventDefault();
              }}
            />
          )}
          <SupportOnly>
            <ItemActionButton
              icon={<EditIcon />}
              label="Support"
              onClick={(e) => {
                setSupportDrawerIsOpen(true);
                e.preventDefault();
              }}
            />
          </SupportOnly>
          <ItemActionButton
            icon={<InfoIcon />}
            label="More info"
            to={`/items/${item.id}`}
            onClick={(e) => {
              const willProbablyOpenInNewTab =
                e.metaKey || e.shiftKey || e.altKey || e.ctrlKey;
              if (willProbablyOpenInNewTab) {
                return;
              }

              setInfoDrawerIsOpen(true);
              e.preventDefault();
            }}
          />
        </Box>
      </ItemContainer>
      <LoadableItemPageDrawer
        item={item}
        isOpen={infoDrawerIsOpen}
        onClose={() => setInfoDrawerIsOpen(false)}
      />
      <SupportOnly>
        <LoadableItemSupportDrawer
          item={item}
          isOpen={supportDrawerIsOpen}
          onClose={() => setSupportDrawerIsOpen(false)}
        />
      </SupportOnly>
    </>
  );
}

/**
 * ItemSkeleton is a placeholder for when an Item is loading.
 */
function ItemSkeleton() {
  return (
    <ItemContainer isDisabled>
      <Skeleton width="50px" height="50px" />
      <Box width="3" />
      <Skeleton height="1.5rem" width="12rem" alignSelf="center" />
    </ItemContainer>
  );
}

/**
 * ItemContainer is the outermost element of an `Item`.
 *
 * It provides spacing, but also is responsible for a number of hover/focus/etc
 * styles - including for its children, who sometimes reference it as an
 * .item-container parent!
 */
function ItemContainer({ children, isDisabled = false }) {
  const theme = useTheme();

  const focusBackgroundColor = useColorModeValue(
    theme.colors.gray["100"],
    theme.colors.gray["700"]
  );

  const activeBorderColor = useColorModeValue(
    theme.colors.green["400"],
    theme.colors.green["500"]
  );

  const focusCheckedBorderColor = useColorModeValue(
    theme.colors.green["800"],
    theme.colors.green["300"]
  );

  return (
    <Box
      p="1"
      my="1"
      borderRadius="lg"
      d="flex"
      cursor={isDisabled ? undefined : "pointer"}
      border="1px"
      borderColor="transparent"
      className={cx([
        "item-container",
        !isDisabled &&
          css`
            &:hover,
            input:focus + & {
              background-color: ${focusBackgroundColor};
            }

            input:active + & {
              border-color: ${activeBorderColor};
            }

            input:checked:focus + & {
              border-color: ${focusCheckedBorderColor};
            }
          `,
      ])}
    >
      {children}
    </Box>
  );
}

function ItemBadges({ item }) {
  const { isSupportUser } = useSupport();
  const occupiedZones = item.appearanceOn.layers.map((l) => l.zone);
  const restrictedZones = item.appearanceOn.restrictedZones.filter(
    (z) => z.isCommonlyUsedByItems
  );
  const isMaybeAnimated = item.appearanceOn.layers.some(
    (l) => l.canvasMovieLibraryUrl
  );

  return (
    <ItemBadgeList>
      {item.isNc ? (
        <NcBadge />
      ) : (
        // The main purpose of the NP badge is alignment: if there are
        // zone badges, we want them to start at the same rough position,
        // even if there's an NC badge at the start. But if this view
        // generally avoids zone badges, we'd rather have the NC badge be
        // a little extra that might pop up and hide the NP case, rather
        // than try to line things up like a table.
        <NpBadge />
      )}
      {
        // This badge is unreliable, but it's helpful for looking for animated
        // items to test, so we show it only to support. We use this form
        // instead of <SupportOnly />, to avoid adding extra badge list spacing
        // on the additional empty child.
        isMaybeAnimated && isSupportUser && <MaybeAnimatedBadge />
      }
      {item.currentUserOwnsThis && <YouOwnThisBadge variant="short" />}
      {item.currentUserWantsThis && <YouWantThisBadge variant="short" />}
      {getZoneBadges(occupiedZones, { variant: "occupies" })}
      {getZoneBadges(restrictedZones, { variant: "restricts" })}
    </ItemBadgeList>
  );
}

/**
 * ItemActionButton is one of a list of actions a user can take for this item.
 */
function ItemActionButton({ icon, label, to, onClick }) {
  const theme = useTheme();

  const focusBackgroundColor = useColorModeValue(
    theme.colors.gray["300"],
    theme.colors.gray["800"]
  );
  const focusColor = useColorModeValue(
    theme.colors.gray["700"],
    theme.colors.gray["200"]
  );

  return (
    <Tooltip label={label} placement="top">
      <IconButton
        as={to ? Link : "button"}
        icon={icon}
        aria-label={label}
        variant="ghost"
        color="gray.400"
        to={to}
        onClick={onClick}
        className={css`
          opacity: 0;
          transition: all 0.2s;

          ${containerHasFocus} {
            opacity: 1;
          }

          &:focus,
          &:hover {
            opacity: 1;
            background-color: ${focusBackgroundColor};
            color: ${focusColor};
          }

          /* On touch devices, always show the buttons! This avoids having to
           * tap to reveal them (which toggles the item), or worse,
           * accidentally tapping a hidden button without realizing! */
          @media (hover: none) {
            opacity: 1;
          }
        `}
      />
    </Tooltip>
  );
}

/**
 * ItemListContainer is a container for Item components! Wrap your Item
 * components in this to ensure a consistent list layout.
 */
export function ItemListContainer({ children }) {
  return <Flex direction="column">{children}</Flex>;
}

/**
 * ItemListSkeleton is a placeholder for when an ItemListContainer and its
 * Items are loading.
 */
export function ItemListSkeleton({ count }) {
  return (
    <ItemListContainer>
      {Array.from({ length: count }).map((_, i) => (
        <ItemSkeleton key={i} />
      ))}
    </ItemListContainer>
  );
}

/**
 * containerHasFocus is a common CSS selector, for the case where our parent
 * .item-container is hovered or the adjacent hidden radio/checkbox is
 * focused.
 */
const containerHasFocus =
  ".item-container:hover &, input:focus + .item-container &";

export default React.memo(Item);