"use client";

import { Coins } from "lucide-react";
import { useCallback, useEffect, useState } from "react";

import { TintedSpriteIcon } from "@/components/character/tinted-sprite-icon";
import { Button } from "@/components/ui/button";
import { Card, CardContent } from "@/components/ui/card";
import { useToast } from "@/components/ui/toast-provider";
import { HABIT_PET_DATA_UPDATED_EVENT } from "@/lib/app-events";
import { getAvatarCustomization } from "@/lib/avatar-customization-storage";
import type { AvatarCustomization } from "@/lib/avatar-customization-storage";
import { defaultAvatarCustomization } from "@/lib/avatar-customization-storage";
import { DEFAULT_GRAY_COLOR } from "@/lib/character/presets";
import { getRoomBackground, normalizeRoomBackgroundId } from "@/lib/room-backgrounds";
import {
  equipShopItem,
  getShopInventory,
  purchaseShopItem,
  unequipShopItem,
} from "@/lib/shop-storage";
import {
  getLayerLabel,
  type ShopItemRecord,
  type ShopLayerId,
} from "@/lib/shop-catalog";
import { ShopItemPreviewModal } from "@/components/shop/shop-item-preview-modal";
import { cn } from "@/lib/utils";

function ShopItemPriceBadge({
  price,
  owned,
  equipped,
}: {
  price: number;
  owned: boolean;
  equipped?: boolean;
}) {
  const boxClassName =
    "inline-flex shrink-0 items-center justify-center gap-2.5 border-2 px-5 font-pixel text-[13px] font-normal uppercase tracking-wide leading-none shadow-[var(--retro-shadow-sm)] h-12";

  if (owned) {
    return (
      <div
        className={cn(
          boxClassName,
          "border-border/60 bg-muted/30 text-muted-foreground",
        )}
      >
        {equipped ? "Equipped" : "Owned"}
      </div>
    );
  }

  return (
    <div
      className={cn(
        boxClassName,
        "border-primary/35 bg-primary/10 text-primary",
      )}
    >
      <Coins aria-hidden="true" className="size-5 shrink-0" />
      <span className="tabular-nums">{price}</span>
      <span className="text-primary/80">pts</span>
    </div>
  );
}

const SHOP_LAYER_ORDER: ShopLayerId[] = [
  "head",
  "torso",
  "pants",
  "shoes",
  "eyes",
];

function ShopItemCard({
  item,
  owned,
  equipped,
  canAfford,
  isPending,
  onPurchase,
  onEquipToggle,
  onPreview,
}: {
  item: ShopItemRecord;
  owned: boolean;
  equipped: boolean;
  canAfford: boolean;
  isPending: boolean;
  onPurchase: () => void;
  onEquipToggle: () => void;
  onPreview: () => void;
}) {
  const room = item.type === "room" ? getRoomBackground(item.id) : null;

  const actionLabel = (() => {
    if (isPending) {
      return owned ? "Updating..." : "Processing...";
    }

    if (owned) {
      return equipped ? "Equipped" : "Equip";
    }

    if (!canAfford) {
      return "Need more points";
    }

    return "Buy";
  })();

  return (
    <Card className="flex h-full flex-col overflow-hidden">
      <CardContent className="flex h-full flex-col gap-3 p-3">
        <div className="flex min-w-0 items-start gap-3">
          <div className="flex size-12 shrink-0 items-center justify-center overflow-hidden border-2 border-border bg-zinc-950/80 p-1">
            {room ? (
              // eslint-disable-next-line @next/next/no-img-element
              <img
                src={item.image_path || room.sceneImage}
                alt=""
                className="size-full object-cover image-pixelated"
              />
            ) : (
              <TintedSpriteIcon
                src={item.image_path}
                color={DEFAULT_GRAY_COLOR.hsl}
                size={32}
              />
            )}
          </div>

          <div className="flex min-w-0 flex-1 items-start justify-between gap-2">
            <p className="min-w-0 pt-1 text-sm font-medium leading-snug">
              {item.name}
            </p>
            <ShopItemPriceBadge
              price={item.price}
              owned={owned}
              equipped={equipped}
            />
          </div>
        </div>

        <div className="mt-auto grid grid-cols-2 gap-2">
          <Button
            type="button"
            className="h-auto min-h-9 whitespace-normal px-2 py-2 text-[10px] leading-snug"
            variant="outline"
            disabled={isPending}
            onClick={onPreview}
          >
            Preview
          </Button>
          <Button
            className="h-auto min-h-9 whitespace-normal px-2 py-2 text-[10px] leading-snug"
            variant={owned && equipped ? "default" : "outline"}
            disabled={
              isPending ||
              (!owned && !canAfford) ||
              (owned && item.type === "room" && equipped)
            }
            onClick={owned ? onEquipToggle : onPurchase}
          >
            {actionLabel}
          </Button>
        </div>
      </CardContent>
    </Card>
  );
}

export function ShopContent() {
  const { toast } = useToast();
  const [items, setItems] = useState<ShopItemRecord[]>([]);
  const [ownedItemIds, setOwnedItemIds] = useState<string[]>([]);
  const [equippedItems, setEquippedItems] = useState<string[]>([]);
  const [equippedRoomBackground, setEquippedRoomBackground] = useState("room-1");
  const [coins, setCoins] = useState<number | null>(null);
  const [error, setError] = useState<string | null>(null);
  const [pendingItemId, setPendingItemId] = useState<string | null>(null);
  const [baseCustomization, setBaseCustomization] =
    useState<AvatarCustomization>(defaultAvatarCustomization);
  const [previewItem, setPreviewItem] = useState<ShopItemRecord | null>(null);

  const refreshShop = useCallback(async () => {
    setError(null);

    let nextEquippedItems: string[] = [];
    let nextEquippedRoomBackground = "room-1";

    try {
      const inventory = await getShopInventory();
      setItems(inventory.items);
      setOwnedItemIds(inventory.ownedItemIds);
      setEquippedItems(inventory.equippedItems);
      setEquippedRoomBackground(inventory.equippedRoomBackground);
      setCoins(inventory.coins);
      nextEquippedItems = inventory.equippedItems;
      nextEquippedRoomBackground = inventory.equippedRoomBackground;
    } catch (refreshError) {
      setError(
        refreshError instanceof Error
          ? refreshError.message
          : "Could not load the shop.",
      );
      setCoins(0);
    }

    try {
      const customization = await getAvatarCustomization();
      setBaseCustomization({
        ...customization,
        equippedItems: nextEquippedItems,
        roomBackground: normalizeRoomBackgroundId(nextEquippedRoomBackground),
      });
    } catch {
      setBaseCustomization((current) => ({
        ...current,
        equippedItems: nextEquippedItems,
        roomBackground: normalizeRoomBackgroundId(nextEquippedRoomBackground),
      }));
    }
  }, []);

  useEffect(() => {
    void refreshShop();

    window.addEventListener(HABIT_PET_DATA_UPDATED_EVENT, refreshShop);
    return () => {
      window.removeEventListener(HABIT_PET_DATA_UPDATED_EVENT, refreshShop);
    };
  }, [refreshShop]);

  const handlePurchase = async (itemId: string) => {
    setPendingItemId(itemId);

    try {
      const item = await purchaseShopItem(itemId);
      await equipShopItem(itemId);
      toast(`Purchased and equipped ${item.name}.`, "success");
      await refreshShop();
    } catch (purchaseError) {
      toast(
        purchaseError instanceof Error
          ? purchaseError.message
          : "Purchase failed.",
        "error",
      );
    } finally {
      setPendingItemId(null);
    }
  };

  const handleEquipToggle = async (item: ShopItemRecord) => {
    setPendingItemId(item.id);

    try {
      const isEquipped =
        item.type === "room"
          ? equippedRoomBackground === item.id
          : equippedItems.includes(item.id);

      if (item.type !== "room" && isEquipped) {
        await unequipShopItem(item.id);
        toast(`Unequipped ${item.name}.`, "default");
      } else if (!isEquipped) {
        await equipShopItem(item.id);
        toast(`Equipped ${item.name}.`, "success");
      }

      await refreshShop();
    } catch (equipError) {
      toast(
        equipError instanceof Error ? equipError.message : "Could not equip item.",
        "error",
      );
    } finally {
      setPendingItemId(null);
    }
  };

  const styleGroups = SHOP_LAYER_ORDER.map((layerId) => ({
    layerId,
    label: getLayerLabel(layerId),
    items: items.filter((item) => item.type === layerId),
  })).filter((group) => group.items.length > 0);

  const roomItems = items.filter((item) => item.type === "room");

  const itemGridClassName = "grid grid-cols-1 gap-3 lg:grid-cols-2 xl:grid-cols-3";

  const previewOwned = previewItem
    ? ownedItemIds.includes(previewItem.id)
    : false;
  const previewEquipped = previewItem
    ? previewItem.type === "room"
      ? equippedRoomBackground === previewItem.id
      : equippedItems.includes(previewItem.id)
    : false;
  const previewCanAfford = previewItem
    ? coins !== null && coins >= previewItem.price
    : false;

  return (
    <>
      <ShopItemPreviewModal
        item={previewItem}
        baseCustomization={baseCustomization}
        coins={coins}
        owned={previewOwned}
        equipped={previewEquipped}
        canAfford={previewCanAfford}
        isPending={previewItem !== null && pendingItemId === previewItem.id}
        onClose={() => setPreviewItem(null)}
        onPurchase={() => {
          if (previewItem) {
            void handlePurchase(previewItem.id);
          }
        }}
        onEquipToggle={() => {
          if (previewItem) {
            void handleEquipToggle(previewItem);
          }
        }}
      />

      {error ? <p className="mb-4 text-xs text-red-500">{error}</p> : null}

      {!error && coins !== null && items.length === 0 ? (
        <Card>
          <CardContent className="p-4">
            <p className="text-sm text-muted-foreground">
              Nothing in the shop right now. Keep completing habits and daily
              check-ins to earn points for when new styles arrive.
            </p>
          </CardContent>
        </Card>
      ) : null}

      <div className="grid gap-8">
        {roomItems.length > 0 ? (
          <section className="grid gap-3">
            <h3 className="text-sm font-semibold uppercase tracking-wider text-muted-foreground">
              Room backgrounds
            </h3>
            <div className={itemGridClassName}>
              {roomItems.map((item) => (
                <ShopItemCard
                  key={item.id}
                  item={item}
                  owned={ownedItemIds.includes(item.id)}
                  equipped={equippedRoomBackground === item.id}
                  canAfford={coins !== null && coins >= item.price}
                  isPending={pendingItemId === item.id}
                  onPurchase={() => void handlePurchase(item.id)}
                  onEquipToggle={() => void handleEquipToggle(item)}
                  onPreview={() => setPreviewItem(item)}
                />
              ))}
            </div>
          </section>
        ) : null}

        {styleGroups.map((group) => (
          <section key={group.layerId} className="grid gap-3">
            <h3 className="text-sm font-semibold uppercase tracking-wider text-muted-foreground">
              {group.label}
            </h3>
            <div className={itemGridClassName}>
              {group.items.map((item) => (
                <ShopItemCard
                  key={item.id}
                  item={item}
                  owned={ownedItemIds.includes(item.id)}
                  equipped={equippedItems.includes(item.id)}
                  canAfford={coins !== null && coins >= item.price}
                  isPending={pendingItemId === item.id}
                  onPurchase={() => void handlePurchase(item.id)}
                  onEquipToggle={() => void handleEquipToggle(item)}
                  onPreview={() => setPreviewItem(item)}
                />
              ))}
            </div>
          </section>
        ))}
      </div>
    </>
  );
}