import {
  NavigationProp,
  useFocusEffect,
  useNavigation,
} from '@react-navigation/native';
import {useCallback, useState} from 'react';
import {FlatList, Image} from 'react-native';
import {List} from 'react-native-paper';
import {getBestReps, getBestWeights} from './best.service';
import {BestPageParams} from './BestPage';
import DrawerHeader from './DrawerHeader';
import Page from './Page';
import Set from './set';
import {useSettings} from './use-settings';

export default function BestList() {
  const [bests, setBests] = useState<Set[]>();
  const [term, setTerm] = useState('');
  const navigation = useNavigation<NavigationProp<BestPageParams>>();
  const {settings} = useSettings();

  const refresh = useCallback(async (value: string) => {
    const weights = await getBestWeights(value);
    console.log(`${BestList.name}.refresh:`, {length: weights.length});
    let newBest: Set[] = [];
    for (const set of weights) {
      const reps = await getBestReps(set.name, set.weight);
      newBest.push(...reps);
    }
    setBests(newBest);
  }, []);

  useFocusEffect(
    useCallback(() => {
      refresh(term);
    }, [refresh, term]),
  );

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

  const renderItem = ({item}: {item: Set}) => (
    <List.Item
      key={item.name}
      title={item.name}
      description={`${item.reps} x ${item.weight}${item.unit || 'kg'}`}
      onPress={() => navigation.navigate('ViewBest', {best: item})}
      left={() =>
        (settings.images && item.image && (
          <Image source={{uri: item.image}} style={{height: 75, width: 75}} />
        )) ||
        null
      }
    />
  );

  return (
    <>
      <DrawerHeader name="Best" />
      <Page term={term} search={search}>
        {bests?.length === 0 ? (
          <List.Item
            title="No exercises yet"
            description="Once sets have been added, this will highlight your personal bests."
          />
        ) : (
          <FlatList style={{flex: 1}} renderItem={renderItem} data={bests} />
        )}
      </Page>
    </>
  );
}