import {
  NavigationProp,
  useFocusEffect,
  useNavigation,
} from "@react-navigation/native";
import { useCallback, useState } from "react";
import { FlatList } from "react-native";
import { List } from "react-native-paper";
import { Like } from "typeorm";
import { getNow, setRepo, settingsRepo } from "./db";
import DrawerHeader from "./DrawerHeader";
import GymSet, { defaultSet } from "./gym-set";
import { HomePageParams } from "./home-page-params";
import ListMenu from "./ListMenu";
import Page from "./Page";
import SetItem from "./SetItem";
import Settings from "./settings";

const limit = 15;

export default function SetList() {
  const [sets, setSets] = useState<GymSet[]>([]);
  const [offset, setOffset] = useState(0);
  const [term, setTerm] = useState("");
  const [end, setEnd] = useState(false);
  const [settings, setSettings] = useState<Settings>();
  const [ids, setIds] = useState<number[]>([]);
  const navigation = useNavigation<NavigationProp<HomePageParams>>();

  const refresh = useCallback(async (value: string) => {
    const newSets = await setRepo.find({
      where: { name: Like(`%${value.trim()}%`), hidden: 0 as any },
      take: limit,
      skip: 0,
      order: { created: "DESC" },
    });
    console.log(`${SetList.name}.refresh:`, { value, limit });
    setSets(newSets);
    setOffset(0);
    setEnd(false);
  }, []);

  useFocusEffect(
    useCallback(() => {
      refresh(term);
      settingsRepo.findOne({ where: {} }).then(setSettings);
    }, [refresh, term])
  );

  const renderItem = useCallback(
    ({ item }: { item: GymSet }) => (
      <SetItem
        settings={settings}
        item={item}
        key={item.id}
        onRemove={() => refresh(term)}
        ids={ids}
        setIds={setIds}
      />
    ),
    [refresh, term, settings, ids]
  );

  const next = useCallback(async () => {
    if (end) return;
    const newOffset = offset + limit;
    console.log(`${SetList.name}.next:`, { offset, newOffset, term });
    const newSets = await setRepo.find({
      where: { name: Like(`%${term}%`), hidden: 0 as any },
      take: limit,
      skip: newOffset,
      order: { created: "DESC" },
    });
    if (newSets.length === 0) return setEnd(true);
    if (!sets) return;
    setSets([...sets, ...newSets]);
    if (newSets.length < limit) return setEnd(true);
    setOffset(newOffset);
  }, [term, end, offset, sets]);

  const onAdd = useCallback(async () => {
    const now = await getNow();
    let set = sets[0];
    if (!set) set = { ...defaultSet };
    set.created = now;
    delete set.id;
    navigation.navigate("EditSet", { set });
  }, [navigation, sets]);

  const search = useCallback(
    (value: string) => {
      setTerm(value);
      refresh(value);
    },
    [refresh]
  );

  const edit = useCallback(() => {
    navigation.navigate("EditSets", { ids });
    setIds([]);
  }, [ids, navigation]);

  const copy = useCallback(async () => {
    const set = await setRepo.findOne({
      where: { id: ids.pop() },
    });
    delete set.id;
    delete set.created;
    navigation.navigate("EditSet", { set });
    setIds([]);
  }, [ids, navigation]);

  const clear = useCallback(() => {
    setIds([]);
  }, []);

  const remove = useCallback(async () => {
    setIds([]);
    await setRepo.delete(ids.length > 0 ? ids : {});
    await refresh(term);
  }, [ids, refresh, term]);

  const select = useCallback(() => {
    setIds(sets.map((set) => set.id));
  }, [sets]);

  return (
    <>
      <DrawerHeader name={ids.length > 0 ? `${ids.length} selected` : "Home"}>
        <ListMenu
          onClear={clear}
          onCopy={copy}
          onDelete={remove}
          onEdit={edit}
          ids={ids}
          onSelect={select}
        />
      </DrawerHeader>

      <Page onAdd={onAdd} term={term} search={search}>
        {sets?.length === 0 ? (
          <List.Item
            title="No sets yet"
            description="A set is a group of repetitions. E.g. 8 reps of Squats."
          />
        ) : (
          settings && (
            <FlatList
              data={sets}
              style={{ flex: 1 }}
              renderItem={renderItem}
              onEndReached={next}
            />
          )
        )}
      </Page>
    </>
  );
}