import React from "react";
import { css } from "emotion";
import {
  AspectRatio,
  Badge,
  Button,
  Box,
  Skeleton,
  SkeletonText,
  Tooltip,
  VisuallyHidden,
  VStack,
  useBreakpointValue,
  useColorModeValue,
  useTheme,
  useToast,
} from "@chakra-ui/core";
import {
  CheckIcon,
  ExternalLinkIcon,
  ChevronRightIcon,
  StarIcon,
} from "@chakra-ui/icons";
import gql from "graphql-tag";
import { useQuery } from "@apollo/client";
import { useParams } from "react-router-dom";

import {
  ItemBadgeList,
  ItemThumbnail,
  NcBadge,
  NpBadge,
} from "./components/ItemCard";
import { Delay, Heading1, usePageTitle } from "./util";
import OutfitPreview from "./components/OutfitPreview";

function ItemPage() {
  const { itemId } = useParams();
  return <ItemPageContent itemId={itemId} />;
}

/**
 * ItemPageContent is the content of ItemPage, but we also use it as the
 * entry point for ItemPageDrawer! When embedded in ItemPageDrawer, the
 * `isEmbedded` prop is true, so we know not to e.g. set the page title.
 */
export function ItemPageContent({ itemId, isEmbedded }) {
  return (
    <VStack spacing="8">
      <ItemPageHeader itemId={itemId} isEmbedded={isEmbedded} />
      <ItemPageOwnWantButtons itemId={itemId} />
      <ItemPageOutfitPreview itemId={itemId} />
    </VStack>
  );
}

function ItemPageHeader({ itemId, isEmbedded }) {
  const { error, data } = useQuery(
    gql`
      query ItemPage($itemId: ID!) {
        item(id: $itemId) {
          id
          name
          isNc
          thumbnailUrl
          description
          createdAt
        }
      }
    `,
    { variables: { itemId }, returnPartialData: true }
  );

  usePageTitle(data?.item?.name, { skip: isEmbedded });

  // Show 2 lines of description text placeholder on small screens, or when
  // embedded in the wardrobe page's narrow drawer. In larger contexts, show
  // just 1 line.
  const viewportNumDescriptionLines = useBreakpointValue({ base: 2, md: 1 });
  const numDescriptionLines = isEmbedded ? 2 : viewportNumDescriptionLines;

  if (error) {
    return <Box color="red.400">{error.message}</Box>;
  }

  const item = data?.item;

  return (
    <>
      <Box
        display="flex"
        alignItems="center"
        justifyContent="flex-start"
        width="100%"
      >
        <Skeleton isLoaded={item?.thumbnailUrl} marginRight="4">
          <ItemThumbnail item={item} size="lg" isActive flex="0 0 auto" />
        </Skeleton>
        <Box>
          <Skeleton isLoaded={item?.name}>
            <Heading1
              lineHeight="1.1"
              // Nudge down the size a bit in the embed case, to better fit the
              // tighter layout!
              size={isEmbedded ? "xl" : "2xl"}
            >
              {item?.name || "Item name here"}
            </Heading1>
          </Skeleton>
          <ItemPageBadges item={item} isEmbedded={isEmbedded} />
        </Box>
      </Box>
      <Box width="100%" alignSelf="flex-start">
        {item?.description || (
          <Box
            maxWidth="40em"
            minHeight={numDescriptionLines * 1.5 + "em"}
            display="flex"
            flexDirection="column"
            alignItems="stretch"
            justifyContent="center"
          >
            <Delay ms={2000}>
              <SkeletonText noOfLines={numDescriptionLines} spacing="4" />
            </Delay>
          </Box>
        )}
      </Box>
    </>
  );
}

function ItemPageBadges({ item, isEmbedded }) {
  const searchBadgesAreLoaded = item?.name != null && item?.isNc != null;

  return (
    <ItemBadgeList>
      <Skeleton isLoaded={item?.isNc != null}>
        {item?.isNc ? <NcBadge /> : <NpBadge />}
      </Skeleton>
      {
        // If the createdAt date is null (loaded and empty), hide the badge.
        item.createdAt !== null && (
          <Skeleton
            // Distinguish between undefined (still loading) and null (loaded and
            // empty).
            isLoaded={item.createdAt !== undefined}
          >
            <Badge
              display="block"
              minWidth="5.25em"
              boxSizing="content-box"
              textAlign="center"
            >
              {item.createdAt && <ShortTimestamp when={item.createdAt} />}
            </Badge>
          </Skeleton>
        )
      }
      <Skeleton isLoaded={searchBadgesAreLoaded}>
        <LinkBadge
          href={`https://impress.openneo.net/items/${item.id}`}
          isEmbedded={isEmbedded}
        >
          Old DTI
        </LinkBadge>
      </Skeleton>
      <Skeleton isLoaded={searchBadgesAreLoaded}>
        <LinkBadge
          href={
            "https://items.jellyneo.net/search/?name=" +
            encodeURIComponent(item.name) +
            "&name_type=3"
          }
          isEmbedded={isEmbedded}
        >
          Jellyneo
        </LinkBadge>
      </Skeleton>
      <Skeleton isLoaded={searchBadgesAreLoaded}>
        {!item?.isNc && (
          <LinkBadge
            href={
              "http://www.neopets.com/market.phtml?type=wizard&string=" +
              encodeURIComponent(item.name)
            }
            isEmbedded={isEmbedded}
          >
            Shop Wiz
          </LinkBadge>
        )}
      </Skeleton>
      <Skeleton isLoaded={searchBadgesAreLoaded}>
        {!item?.isNc && (
          <LinkBadge
            href={
              "http://www.neopets.com/portal/supershopwiz.phtml?string=" +
              encodeURIComponent(item.name)
            }
            isEmbedded={isEmbedded}
          >
            Super Wiz
          </LinkBadge>
        )}
      </Skeleton>
      <Skeleton isLoaded={searchBadgesAreLoaded}>
        {!item?.isNc && (
          <LinkBadge
            href={
              "http://www.neopets.com/island/tradingpost.phtml?type=browse&criteria=item_exact&search_string=" +
              encodeURIComponent(item.name)
            }
            isEmbedded={isEmbedded}
          >
            Trade Post
          </LinkBadge>
        )}
      </Skeleton>
      <Skeleton isLoaded={searchBadgesAreLoaded}>
        {!item?.isNc && (
          <LinkBadge
            href={
              "http://www.neopets.com/genie.phtml?type=process_genie&criteria=exact&auctiongenie=" +
              encodeURIComponent(item.name)
            }
            isEmbedded={isEmbedded}
          >
            Auctions
          </LinkBadge>
        )}
      </Skeleton>
    </ItemBadgeList>
  );
}

function LinkBadge({ children, href, isEmbedded }) {
  return (
    <Badge
      as="a"
      href={href}
      display="flex"
      alignItems="center"
      // Normally we want to act like a normal webpage, and treat links as
      // normal. But when we're on the wardrobe page, we want to avoid
      // disrupting the outfit, and open in a new window instead.
      target={isEmbedded ? "_blank" : undefined}
    >
      {children}
      {
        // We also change the icon to signal whether this will launch in a new
        // window or not!
        isEmbedded ? <ExternalLinkIcon marginLeft="1" /> : <ChevronRightIcon />
      }
    </Badge>
  );
}

const fullDateFormatter = new Intl.DateTimeFormat("en-US", {
  dateStyle: "long",
});
const monthYearFormatter = new Intl.DateTimeFormat("en-US", {
  month: "short",
  year: "numeric",
});
const monthDayYearFormatter = new Intl.DateTimeFormat("en-US", {
  month: "short",
  day: "numeric",
  year: "numeric",
});
function ShortTimestamp({ when }) {
  const date = new Date(when);

  // To find the start of last month, take today, then set its date to the 1st
  // and its time to midnight (the start of this month), and subtract one
  // month. (JS handles negative months and rolls them over correctly.)
  const startOfLastMonth = new Date();
  startOfLastMonth.setDate(1);
  startOfLastMonth.setHours(0);
  startOfLastMonth.setMinutes(0);
  startOfLastMonth.setSeconds(0);
  startOfLastMonth.setMilliseconds(0);
  startOfLastMonth.setMonth(startOfLastMonth.getMonth() - 1);

  const dateIsOlderThanLastMonth = date < startOfLastMonth;

  return (
    <Tooltip
      label={`First seen on ${fullDateFormatter.format(date)}`}
      placement="top"
      openDelay={400}
    >
      {dateIsOlderThanLastMonth
        ? monthYearFormatter.format(date)
        : monthDayYearFormatter.format(date)}
    </Tooltip>
  );
}

function ItemPageOwnWantButtons({ itemId }) {
  const theme = useTheme();
  const toast = useToast();

  const [currentUserOwnsThis, setCurrentUserOwnsThis] = React.useState(false);
  const [currentUserWantsThis, setCurrentUserWantsThis] = React.useState(false);

  const { loading, error } = useQuery(
    gql`
      query ItemPageOwnWantButtons($itemId: ID!) {
        item(id: $itemId) {
          id
          currentUserOwnsThis
          currentUserWantsThis
        }
      }
    `,
    {
      variables: { itemId },
      onCompleted: (data) => {
        setCurrentUserOwnsThis(data?.item?.currentUserOwnsThis || false);
        setCurrentUserWantsThis(data?.item?.currentUserWantsThis || false);
      },
    }
  );

  if (error) {
    return <Box color="red.400">{error.message}</Box>;
  }

  return (
    <Box display="flex">
      <Skeleton isLoaded={!loading} marginRight="4">
        <Box as="label">
          <VisuallyHidden
            as="input"
            type="checkbox"
            checked={currentUserOwnsThis}
            onChange={(e) => {
              setCurrentUserOwnsThis(e.target.checked);
              toast({
                title: "Todo: This doesn't actually work yet!",
                status: "info",
                duration: 1500,
              });
            }}
          />
          <Button
            as="div"
            colorScheme={currentUserOwnsThis ? "green" : "gray"}
            size="lg"
            cursor="pointer"
            transitionDuration="0.4s"
            className={css`
              input:focus + & {
                box-shadow: ${theme.shadows.outline};
              }
            `}
          >
            <IconCheckbox
              icon={<CheckIcon />}
              isChecked={currentUserOwnsThis}
              marginRight="0.5em"
            />
            I own this
          </Button>
        </Box>
      </Skeleton>

      <Skeleton isLoaded={!loading}>
        <Box as="label">
          <VisuallyHidden
            as="input"
            type="checkbox"
            isChecked={currentUserWantsThis}
            onChange={(e) => {
              setCurrentUserWantsThis(e.target.checked);
              toast({
                title: "Todo: This doesn't actually work yet!",
                status: "info",
                duration: 1500,
              });
            }}
          />
          <Button
            as="div"
            colorScheme={currentUserWantsThis ? "blue" : "gray"}
            size="lg"
            cursor="pointer"
            transitionDuration="0.4s"
            className={css`
              input:focus + & {
                box-shadow: ${theme.shadows.outline};
              }
            `}
          >
            <IconCheckbox
              icon={<StarIcon />}
              isChecked={currentUserWantsThis}
              marginRight="0.5em"
            />
            I want this
          </Button>
        </Box>
      </Skeleton>
    </Box>
  );
}

function IconCheckbox({ icon, isChecked, ...props }) {
  return (
    <Box display="grid" gridTemplateAreas="the-same-area" {...props}>
      <Box
        gridArea="the-same-area"
        width="1em"
        height="1em"
        border="2px solid currentColor"
        borderRadius="md"
        opacity={isChecked ? "0" : "0.75"}
        transform={isChecked ? "scale(0.75)" : "none"}
        transition="all 0.4s"
      />
      <Box
        gridArea="the-same-area"
        display="flex"
        opacity={isChecked ? "1" : "0"}
        transform={isChecked ? "none" : "scale(0.1)"}
        transition="all 0.4s"
      >
        {icon}
      </Box>
    </Box>
  );
}

function ItemPageOutfitPreview({ itemId }) {
  const borderColor = useColorModeValue("green.700", "green.400");

  return (
    <AspectRatio
      width="100%"
      maxWidth="300px"
      ratio="1"
      border="1px"
      borderColor={borderColor}
      borderRadius="lg"
      boxShadow="lg"
      overflow="hidden"
    >
      <Box>
        <OutfitPreview
          speciesId="1"
          colorId="8"
          pose="HAPPY_FEM"
          wornItemIds={[itemId]}
          spinnerVariant="corner"
          loadingDelayMs={2000}
        />
      </Box>
    </AspectRatio>
  );
}

export default ItemPage;