import {
  View,
  RefreshControl,
  ActivityIndicator,
  FlatList,
} from "react-native";
import React, { useState, useEffect } from "react";
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 Post from "../../../components/Post";

export default function FeedPosts() {
  //获取新数据
  const [data, setData] = useState([]);
  const [isActivityIndicatorShow, setIsActivityIndicatorShow] = useState(true);
  const [isFetching, setIsFetching] = useState(false);
  const getData = async (type = 0) => {
    //type 0-上滑  1-下拉  2-初始化
    if (isFetching) return;
    const apiUrl = process.env.EXPO_PUBLIC_API_URL;
    setIsFetching(true);
    try {
      const base = await baseRequest();
      const signature = await generateSignature({
        op_type: type,
        ...base,
      });
      const _response = await fetch(
        `${apiUrl}/api/moment/recomm_list?signature=${signature}`,
        {
          method: "POST",
          headers: {
            "Content-Type": "application/json",
          },
          body: JSON.stringify({
            op_type: type,
            ...base,
          }),
        }
      );
      const _data = await _response.json();
      if (_data.ret === -1) {
        Toast.show({
          type: "error",
          text1: _data.msg,
          topOffset: 60,
        });
        return;
      }
      if (type === 1 || type === 2) {
        setData((prev) => _data.data.recomm_list);
        setIsActivityIndicatorShow(true);
      } else {
        setData((prev) => [...prev, ..._data.data.recomm_list]);
        if (_data.data.recomm_list.length === 0)
          setIsActivityIndicatorShow(false);
      }
    } catch (error) {
      console.error(error);
    } finally {
      setIsFetching(false);
    }
  };

  //初始化加载
  useEffect(() => {
    getData(2);
  }, []);

  const tailwind = useTailwind();
  const renderItem = ({ item }) => <Post data={item} />;
  const [refreshing, setRefreshing] = useState(false);
  //下拉刷新
  const handleRefresh = async () => {
    setRefreshing(true);
    await getData(1);
    setRefreshing(false);
  };

  return (
    <View style={tailwind("flex-1")}>
      <FlatList
        data={data}
        renderItem={renderItem}
        initialNumToRender={4}
        refreshControl={
          <RefreshControl
            colors={["#FF669E"]}
            tintColor="white"
            refreshing={refreshing}
            onRefresh={() => handleRefresh()}
          />
        }
        onEndReached={() => getData(0)}
        ListEmptyComponent={<Empty type="nodata" />}
        ListFooterComponent={
          <View>
            {isActivityIndicatorShow && data.length !== 0 && (
              <ActivityIndicator style={tailwind("my-4")} size="large" />
            )}
          </View>
        }
      />
    </View>
  );
}
