import {
  CheckOutlined,
  DeleteOutlined,
  EditOutlined,
  FilterOutlined,
  SearchOutlined,
  SortAscendingOutlined,
  UndoOutlined,
} from "@ant-design/icons";
import {
  Badge,
  Button,
  ConfigProvider,
  Input,
  Space,
  type ThemeConfig,
} from "antd";
import { memo, useEffect, useRef, useState } from "react";
import { DndProvider, useDrag, useDrop } from "react-dnd";
import { HTML5Backend } from "react-dnd-html5-backend";
import { LoaderFunction } from "react-router-dom";
import { v4 as v4uuid } from "uuid";
import { proxy, useSnapshot } from "valtio";
import { subscribeKey } from "valtio/utils";

import { type CardMeta, searchCards } from "@/api";
import { deckStore, type IDeck, initStore } from "@/stores";
import {
  Background,
  IconFont,
  Loading,
  ScrollableArea,
  YgoCard,
} from "@/ui/Shared";

import { CardDetail } from "./CardDetail";
import { DeckSelect } from "./DeckSelect";
import styles from "./index.module.scss";
import {
  type EditingDeck,
  editingDeckToIDeck,
  iDeckToEditingDeck,
} from "./utils";

const theme: ThemeConfig = {
  components: {
    Layout: {
      colorBgBody: "transparent",
    },
  },
};

export const loader: LoaderFunction = async () => {
  // 必须先加载卡组，不然页面会崩溃
  if (!initStore.decks) {
    await new Promise<void>((rs) => {
      subscribeKey(initStore, "decks", (done) => done && rs());
    });
  }
  return null;
};

export const Component: React.FC = () => {
  const snapDecks = useSnapshot(deckStore);
  const { sqlite } = useSnapshot(initStore);
  const [selectedDeck, setSelectedDeck] = useState<IDeck>(deckStore.decks[0]);

  return (
    <DndProvider backend={HTML5Backend}>
      <ConfigProvider theme={theme}>
        <Background />
        <div className={styles.layout} style={{ width: "100%" }}>
          <div className={styles.sider}>
            <ScrollableArea className={styles["deck-select-container"]}>
              <DeckSelect
                decks={snapDecks.decks}
                selected={selectedDeck.deckName}
                onSelect={(name) =>
                  setSelectedDeck(deckStore.get(name) ?? deckStore.decks[0])
                }
                onDelete={(id) => console.log(id)}
                onDownload={(id) => console.log(id)}
                onAdd={() => console.log("add")}
              />
            </ScrollableArea>
            <CardDetail code={123} open={false} onClose={() => {}} />
          </div>
          <div className={styles.content}>
            <div className={styles.deck}>
              <DeckEditor deck={selectedDeck} onSave={() => {}} />
            </div>
            <div className={styles.select}>
              {sqlite.progress === 1 ? (
                <CardSelect />
              ) : (
                <div className={styles.container}>
                  <Loading />
                </div>
              )}
            </div>
          </div>
        </div>
      </ConfigProvider>
    </DndProvider>
  );
};
Component.displayName = "Build";

/** 正在编辑的卡组 */
const DeckEditor: React.FC<{
  deck: IDeck;
  onSave: (deck: IDeck) => void;
}> = ({ deck, onSave }) => {
  const snapEditDeck = useSnapshot(editDeckStore);
  useEffect(() => {
    iDeckToEditingDeck(deck).then(editDeckStore.set);
  }, [deck]);
  return (
    <div className={styles.container}>
      <Space className={styles.title}>
        <Input
          placeholder="请输入卡组名字"
          bordered={false}
          prefix={<EditOutlined />}
          style={{ width: 400 }}
          onChange={(e) =>
            editDeckStore.set({
              ...editDeckStore,
              deckName: e.target.value,
            })
          }
          value={snapEditDeck.deckName}
        />
        <Space style={{ marginRight: 6 }}>
          <Button type="text" size="small" icon={<DeleteOutlined />}>
            清空
          </Button>
          <Button type="text" size="small" icon={<UndoOutlined />}>
            重置
          </Button>
          <Button
            type="text"
            size="small"
            icon={<CheckOutlined />}
            onClick={() => onSave(editingDeckToIDeck(editDeckStore))}
          >
            保存
          </Button>
        </Space>
      </Space>
      <ScrollableArea className={styles["deck-zone"]}>
        {(["main", "extra", "side"] as const).map((type) => (
          <DeckZone key={type} type={type} />
        ))}
      </ScrollableArea>
    </div>
  );
};

/** 卡片库，选择卡片加入正在编辑的卡组 */
const CardSelect: React.FC = () => {
  const [searchWord, setSearchWord] = useState("");
  const [searchResult, setSearchResult] = useState<CardMeta[]>([]);
  const handleSearch = async () => {
    const result = await searchCards(searchWord);
    setSearchResult(result);
  };
  return (
    <div className={styles.container}>
      <div className={styles.title}>
        <Input
          placeholder="搜索卡片"
          bordered={false}
          suffix={
            <Button
              type="text"
              icon={<SearchOutlined />}
              onClick={handleSearch}
            />
          }
          value={searchWord}
          onChange={(e) => setSearchWord(e.target.value)}
          onKeyUp={(e) => e.key === "Enter" && handleSearch()}
        />
      </div>
      <div className={styles["select-btns"]}>
        <Button block type="text" icon={<FilterOutlined />}>
          筛选
          {/* TODO: 下面这个Badge应根据有无筛选规则而显示 */}
          {false && <Badge dot offset={[5, -5]} />}
        </Button>
        <Button block type="text" icon={<SortAscendingOutlined />}>
          <span>
            排列
            <span className={styles["search-count"]}>
              ({searchResult.length})
            </span>
          </span>
          {false && <Badge dot offset={[5, -5]} />}
        </Button>
        <Button block type="text" icon={<DeleteOutlined />}>
          重置
        </Button>
      </div>
      <ScrollableArea className={styles["search-cards-container"]}>
        {searchResult.length ? (
          <SearchResults results={searchResult} />
        ) : (
          <div className={styles.empty}>
            <IconFont type="icon-empty" size={40} />
            <div>无搜索结果</div>
          </div>
        )}
      </ScrollableArea>
    </div>
  );
};

/** 正在组卡的zone，包括main/extra/side */
const DeckZone: React.FC<{
  type: "main" | "extra" | "side";
}> = ({ type }) => {
  const cards = useSnapshot(editDeckStore)[type];
  const [_, dropRef] = useDrop({
    accept: ["Card"], // 指明该区域允许接收的拖放物。可以是单个，也可以是数组
    // 里面的值就是useDrag所定义的type
    // 当拖拽物在这个拖放区域放下时触发,这个item就是拖拽物的item（拖拽物携带的数据）
    drop: ({
      value,
      source,
    }: {
      value: CardMeta;
      source: "main" | "extra" | "side" | "search";
    }) => {
      editDeckStore.add(type, value);
      if (source !== "search") {
        editDeckStore.remove(source, value);
      }
    },
  });
  return (
    <div className={styles[type]} ref={dropRef}>
      <div className={styles["card-continer"]}>
        {cards.map((item, i) => (
          <Card value={item} key={i} source={type} />
        ))}
      </div>
    </div>
  );
};

/** 搜索区的搜索结果，使用memo避免重复渲染 */
const SearchResults: React.FC<{
  results: CardMeta[];
}> = memo(({ results }) => {
  const [_, dropRef] = useDrop({
    accept: ["Card"], // 指明该区域允许接收的拖放物。可以是单个，也可以是数组
    // 里面的值就是useDrag所定义的type
    // 当拖拽物在这个拖放区域放下时触发,这个item就是拖拽物的item（拖拽物携带的数据）
    drop: ({
      value,
      source,
    }: {
      value: CardMeta;
      source: "main" | "extra" | "side" | "search";
    }) => {
      if (source !== "search") {
        editDeckStore.remove(source, value);
      }
    },
  });
  return (
    <div className={styles["search-cards"]} ref={dropRef}>
      {results.map((item) => (
        <Card value={item} key={v4uuid()} source="search" />
      ))}
    </div>
  );
});

/** 本组件内使用的单张卡片，增加了文字在图片下方 */
const Card: React.FC<{
  value: CardMeta;
  source: "main" | "extra" | "side" | "search";
}> = memo(({ value, source }) => {
  const ref = useRef<HTMLDivElement>(null);
  const [{ isDragging }, drag] = useDrag({
    type: "Card",
    item: { value, source },
    collect: (monitor: any) => ({
      isDragging: monitor.isDragging(),
    }),
  });
  drag(ref);
  return (
    <div className={styles.card} ref={ref}>
      <div className={styles.cardname}>{value.text.name}</div>
      <YgoCard className={styles.cardcover} code={value.id} />
    </div>
  );
});

const editDeckStore = proxy({
  deckName: "",
  main: [] as CardMeta[],
  extra: [] as CardMeta[],
  side: [] as CardMeta[],
  add(type: "main" | "extra" | "side", card: CardMeta) {
    editDeckStore[type].push(card);
  },
  remove(type: "main" | "extra" | "side", card: CardMeta) {
    const index = editDeckStore[type].findIndex((item) => item.id === card.id);
    if (index !== -1) {
      editDeckStore[type].splice(index, 1);
    }
  },
  set(deck: EditingDeck) {
    editDeckStore.deckName = deck.deckName;
    editDeckStore.main = deck.main;
    editDeckStore.extra = deck.extra;
    editDeckStore.side = deck.side;
  },
}) satisfies EditingDeck;
