import {
  View,
  RefreshControl,
  ActivityIndicator,
  Animated,
  Easing,
  TouchableOpacity,
} from "react-native";
import React, { useState, useRef, createContext, useEffect } from "react";
import StreamerCard from "../../../components/StreamerCard";
import Empty from "../../../components/Empty";
import { useTailwind } from "tailwind-rn";
import baseRequest from "../../../utils/baseRequest";
import Toast from "react-native-toast-message";
import { generateSignature } from "../../../utils/crypto";
import { FlashList } from "@shopify/flash-list";
import { Svg, Path } from "react-native-svg";

export const FeedShowVideoContext = createContext("");

export default function FeedStream() {
  //获取推荐的主播mid
  const [recommMids, setRecommMids] = useState([]);
  const getRecommMids = async () => {
    if (!isEnd) return;
    const apiUrl = process.env.EXPO_PUBLIC_API_URL;
    try {
      const base = await baseRequest();
      const signature = await generateSignature({
        ...base,
      });
      const response = await fetch(
        `${apiUrl}/api/streamer/recomm_list?signature=${signature}`,
        {
          method: "POST",
          headers: {
            "Content-Type": "application/json",
          },
          body: JSON.stringify({
            ...base,
          }),
        }
      );
      const recommData = await response.json();
      if (recommData.ret === -1) {
        Toast.show({
          type: "error",
          text1: recommData.msg,
          topOffset: 60,
        });
        return;
      }
      setIsEnd(false);
      setRecommMids(recommData.data.recomm_list);
    } catch (error) {
      console.error(error);
    }
  };

  //查询的起始索引
  const [startIndex, setStartIndex] = useState(0);
  // 定义每次取多少个用户ID
  const batchSize = 10;
  //获取新数据
  const [data, setData] = useState([]);
  const [isEnd, setIsEnd] = useState(true);
  const [isActivityIndicatorShow, setIsActivityIndicatorShow] = useState(true);
  const [isFetching, setIsFetching] = useState(false);
  const getData = async (type) => {
    if (isFetching) return;
    if (isEnd) return;
    if (recommMids.length === 0) return;
    const apiUrl = process.env.EXPO_PUBLIC_API_URL;
    const batchStreamerMids = recommMids.slice(
      startIndex,
      startIndex + batchSize
    );
    if (batchStreamerMids.length === 0) {
      if (type !== "top") {
        setIsActivityIndicatorShow(false);
        return;
      }
      setIsActivityIndicatorShow(true);
      setIsEnd(true);
      setStartIndex(0);
      return;
    }
    setIsFetching((prev) => true);
    try {
      const base = await baseRequest();
      const signature = await generateSignature({
        mids: batchStreamerMids,
        ...base,
      });
      const detailResponse = await fetch(
        `${apiUrl}/api/streamer/list_ext_by_mids?signature=${signature}`,
        {
          method: "POST",
          headers: {
            "Content-Type": "application/json",
          },
          body: JSON.stringify({
            mids: batchStreamerMids,
            ...base,
          }),
        }
      );
      const detailData = await detailResponse.json();
      if (detailData.ret === -1) {
        Toast.show({
          type: "error",
          text1: detailData.msg,
          topOffset: 60,
        });
        return;
      }
      const sortedData = detailData.data.list.sort((a, b) => b.fans - a.fans);
      if (type === "top") {
        setData((prev) => {
          if (startIndex === 0) {
            return sortedData;
          } else return [...sortedData, ...prev];
        });
      } else {
        setData((prev) => [...prev, ...sortedData]);
      }
      // 更新下一次查询的起始索引
      setStartIndex(startIndex + batchSize);
      setIsFetching((prev) => false);
    } catch (error) {
      console.error(error);
    }
  };

  //获取推荐mid
  useEffect(() => {
    getRecommMids();
  }, [isEnd]);

  //当推荐的mid改变，获取新数据
  useEffect(() => {
    getData("top");
  }, [recommMids]);

  const tailwind = useTailwind();
  const renderItem = ({ item }) => <StreamerCard data={item} screen="feed" />;
  const [refreshing, setRefreshing] = useState(false);
  const [showVideo, setShowVideo] = useState([]);

  const handleVideoShow = useRef(({ viewableItems }) => {
    let visibleMid = viewableItems.map((item) => {
      return item.item.mid;
    });
    setShowVideo(visibleMid);
  }).current;

  //刷新动画
  const flatListRef = useRef(null);
  const [rotateValue] = useState(new Animated.Value(0));
  const startRotation = () => {
    Animated.timing(rotateValue, {
      toValue: 1,
      duration: 500,
      easing: Easing.linear,
      useNativeDriver: true,
    }).start(() => {
      rotateValue.setValue(0);
    });
  };
  const spin = rotateValue.interpolate({
    inputRange: [0, 1],
    outputRange: ["0deg", "360deg"],
  });
  //下拉刷新
  const handleRefresh = async () => {
    startRotation();
    flatListRef.current.scrollToOffset({ animated: false, offset: 0 });
    setRefreshing(true);
    await getData("top");
    setRefreshing(false);
  };

  return (
    <FeedShowVideoContext.Provider value={showVideo}>
      <View style={tailwind("flex-1")}>
        <FlashList
          ref={flatListRef}
          data={data}
          renderItem={renderItem}
          estimatedItemSize={352}
          initialNumToRender={10}
          refreshControl={
            <RefreshControl
              colors={["#FF669E"]}
              tintColor="white"
              refreshing={refreshing}
              onRefresh={() => handleRefresh()}
            />
          }
          onEndReached={() => getData("bottom")}
          ListEmptyComponent={<Empty type="nodata" />}
          ListFooterComponent={
            <View>
              {isActivityIndicatorShow && data.length !== 0 && (
                <ActivityIndicator style={tailwind("my-4")} size="large" />
              )}
            </View>
          }
          viewabilityConfig={{
            waitForInteraction: false,
            itemVisiblePercentThreshold: 10,
          }}
          onViewableItemsChanged={handleVideoShow}
          keyExtractor={(item) => item.mid}
        />
        <TouchableOpacity
          style={tailwind(
            "absolute right-5 bottom-5 bg-[#13121F] p-1 rounded-full"
          )}
          onPress={handleRefresh}
        >
          <Animated.View style={{ transform: [{ rotate: spin }] }}>
            <Svg viewBox="0 0 1024 1024" width="30" height="30">
              <Path
                d="M855.7 546.3c-16.6 0-30-13.5-30-30.1 0.1-72.8-25.1-143.9-71-200.4l-1-1.3c-31.5-38.5-72.1-69.2-117.3-88.9l-0.6-0.2-2.2-1c-6.8-2.9-14.3-5.6-22.9-8.4l-0.6-0.2-6.5-2.3c-7.1-2.1-14.7-3.9-20.6-5.3-1.2-0.3-2.3-0.5-3.5-0.8-2.1-0.5-4-1-5.6-1.3l-0.4-0.1c-6.8-1.4-14.1-2.5-21.7-3.3l-0.8-0.1-8.4-1.2c-73.7-7.1-147.4 12.6-207.8 55.6-13.5 9.6-32.2 6.5-41.8-7-9.6-13.5-6.5-32.2 7-41.8 72.3-51.5 160.8-75.1 249.1-66.4l1.3 0.2 8.7 1.2c9 1 17.8 2.4 26 4 3.1 0.6 6 1.3 8.6 1.9 1 0.2 1.9 0.5 2.9 0.7 7 1.6 16.2 3.8 25.2 6.5l1.2 0.4 6.9 2.4c10.2 3.4 19.3 6.7 27.7 10.3l0.8 0.4 2.4 1.1c54.1 23.6 102.4 60.4 139.9 106.3l1 1.4c54.4 67.1 84.2 151.5 84.1 237.9-0.1 16.4-13.6 29.8-30.1 29.8z"
                fill="#ffffff"
              ></Path>
              <Path
                d="M872.5 661.6l78.9-114.5c9-13.1-0.3-30.9-16.3-30.9H777.4c-15.9 0-25.3 17.8-16.3 30.9L840 661.6c7.9 11.4 24.7 11.4 32.5 0zM513.3 884.1c-12 0-24-0.6-36-1.8l-1.3-0.2-8.6-1.2c-9-1-17.8-2.4-26-4-3.1-0.6-6-1.3-8.6-1.9-1-0.2-1.9-0.5-2.9-0.7-7-1.6-16.2-3.8-25.2-6.5l-1.2-0.4-6.9-2.4c-10.2-3.4-19.3-6.7-27.7-10.3l-0.8-0.4-2.4-1.1c-54.1-23.6-102.4-60.4-139.9-106.3l-1-1.4c-54.4-67.1-84.2-151.5-84.1-237.9 0-16.6 13.5-29.9 30-29.9h0.1c16.6 0 30 13.5 29.9 30.1-0.1 72.8 25.1 143.9 71 200.4l1 1.3c31.5 38.5 72.1 69.2 117.3 88.9l2.8 1.3c6.8 2.9 14.3 5.6 22.9 8.4l0.6 0.2 6.5 2.3c7.1 2.1 14.7 3.9 20.6 5.3 1.2 0.3 2.3 0.5 3.5 0.8 2.1 0.5 4 1 5.6 1.3l0.4 0.1c6.8 1.3 14.1 2.5 21.7 3.3l0.8 0.1 8.4 1.2c73.7 7.1 147.4-12.6 207.8-55.6 13.5-9.6 32.2-6.5 41.8 7 9.6 13.5 6.5 32.2-7 41.8-62.5 44.5-137 68.2-213.1 68.2z"
                fill="#ffffff"
              ></Path>
              <Path
                d="M153.8 362.4L74.9 476.9c-9 13.1 0.3 30.9 16.3 30.9H249c15.9 0 25.3-17.8 16.3-30.9l-78.9-114.5c-7.9-11.4-24.7-11.4-32.6 0z"
                fill="#ffffff"
              ></Path>
            </Svg>
          </Animated.View>
        </TouchableOpacity>
      </View>
    </FeedShowVideoContext.Provider>
  );
}
