import * as React from "react";
import { ScrollView } from "react-native-gesture-handler";
import type { ICarouselInstance } from "react-native-reanimated-carousel";
import Carousel from "react-native-reanimated-carousel";
import { SafeAreaView } from "react-native-safe-area-context";
 
import { SBItem } from "../../components/SBItem";
import SButton from "../../components/SButton";
import { ElementsText, window } from "../../constants";
import { useWindowDimensions } from "react-native";
import { useSharedValue } from "react-native-reanimated";
 
const PAGE_WIDTH = window.width;
 
function Index() {
  const windowWidth = useWindowDimensions().width;
  const scrollOffsetValue = useSharedValue<number>(0);
  const [data, setData] = React.useState([...new Array(4).keys()]);
  const [isVertical, setIsVertical] = React.useState(false);
  const [isFast, setIsFast] = React.useState(false);
  const [isAutoPlay, setIsAutoPlay] = React.useState(false);
  const [isPagingEnabled, setIsPagingEnabled] = React.useState(true);
  const ref = React.useRef<ICarouselInstance>(null);
 
  const baseOptions = isVertical
    ? ({
      vertical: true,
      width: windowWidth,
      height: PAGE_WIDTH / 2,
    } as const)
    : ({
      vertical: false,
      width: windowWidth,
      height: PAGE_WIDTH / 2,
    } as const);
 
  return (
    <SafeAreaView edges={["bottom"]} style={{ flex: 1 }}>
      <Carousel
        {...baseOptions}
        loop
        enabled // Default is true, just for demo
        ref={ref}
        defaultScrollOffsetValue={scrollOffsetValue}
        testID={"xxx"}
        style={{ width: "100%" }}
        autoPlay={isAutoPlay}
        autoPlayInterval={isFast ? 100 : 2000}
        data={data}
        onScrollStart={()=>{console.log('===1')}}
        onScrollEnd={()=>{console.log('===2')}}
 
        onConfigurePanGesture={g => g.enabled(false)}
        pagingEnabled={isPagingEnabled}
        onSnapToItem={index => console.log("current index:", index)}
        renderItem={({ index }) => <SBItem key={index} index={index} />}
      />
      <ScrollView style={{ flex: 1 }}>
        <SButton
          onPress={() => {
            setData([...new Array(5).keys()]);
          }}
        >
          {"Change the data length to 5"}
        </SButton>
        <SButton
          onPress={() => {
            setData([...new Array(3).keys()]);
          }}
        >
          {"Change the data length to 3"}
        </SButton>
        <SButton
          onPress={() => {
            setIsVertical(!isVertical);
          }}
        >
          {isVertical ? "Set horizontal" : "Set Vertical"}
        </SButton>
        <SButton
          onPress={() => {
            setIsFast(!isFast);
          }}
        >
          {isFast ? "NORMAL" : "FAST"}
        </SButton>
        <SButton
          onPress={() => {
            setIsPagingEnabled(!isPagingEnabled);
          }}
        >
          PagingEnabled:{isPagingEnabled.toString()}
        </SButton>
        <SButton
          onPress={() => {
            setIsAutoPlay(!isAutoPlay);
          }}
        >
          {ElementsText.AUTOPLAY}:{`${isAutoPlay}`}
        </SButton>
        <SButton
          onPress={() => {
            console.log(ref.current?.getCurrentIndex());
          }}
        >
          Log current index
        </SButton>
        <SButton
          onPress={() => {
            setData(
              data.length === 6
                ? [...new Array(8).keys()]
                : [...new Array(6).keys()],
            );
          }}
        >
          Change data length to:{data.length === 6 ? 8 : 6}
        </SButton>
        <SButton
          onPress={() => {
            ref.current?.scrollTo({ count: -1, animated: true });
          }}
        >
          prev
        </SButton>
        <SButton
          onPress={() => {
            ref.current?.scrollTo({ count: 1, animated: true });
          }}
        >
          next
        </SButton>
      </ScrollView>
    </SafeAreaView>
  );
}
 
export default Index;