import { FC, useRef, useState, useCallback } from "react";
import { View, Text, ScrollView, useWindowDimensions } from "react-native";
import { ExGridViewItem } from "./ExGridViewItem";
import Animated, {
  useAnimatedStyle,
  useSharedValue,
  runOnJS,
} from "react-native-reanimated";
import { Gesture, GestureDetector } from "react-native-gesture-handler";

export const ExGridView: FC<{
  data: {
    trainNumber: string;
    array: string;
    name: string;
    type: string;
    time: string;
  }[];
}> = ({ data }) => {
  const groupedData = {};
  const groupKeys = [];

  const { width } = useWindowDimensions();
  data.forEach((item) => {
    const hour = item.time.split(":")[0];
    if (!groupedData[hour]) {
      groupedData[hour] = [];
      groupKeys.push(hour);
    }
    groupedData[hour].push(item);
  });
  // ドラッグ位置を保持する共有値
  const widthX = useSharedValue(width);
  const savedWidthX = useSharedValue(width);
  const [scrollEnabled, setScrollEnabled] = useState(true);
  const scrollRef = useRef<Animated.ScrollView>(null);
  const [contentScrollPos, setContentScrollPos] = useState(0);

  // ScrollViewの有効/無効を切り替える関数
  const toggleScrollEnabled = useCallback((enabled: boolean) => {
    setScrollEnabled(enabled);
  }, []);

  // パンジェスチャー（ドラッグ）のハンドラー
  const pinchGesture = Gesture.Pinch()
    .onUpdate((e) => {
      const calc = savedWidthX.value * e.scale;
      widthX.value = calc > width ? calc : width;
      //runOnJS(scrollToRightEnd)();
    })
    .onEnd(() => {
      savedWidthX.value = widthX.value;
    });

  const gesture = Gesture.Pan()
    .minPointers(2) // 最低2本指
    .maxPointers(2) // 最大2本指
    .onTouchesDown((e) => {
      if (e.numberOfTouches >= 2) runOnJS(toggleScrollEnabled)(false);
    })
    .onTouchesUp((e) => {
      runOnJS(toggleScrollEnabled)(true);
    })
    .onEnd((e) => {
      runOnJS(toggleScrollEnabled)(true);
    });
  // ジェスチャーを組み合わせる
  const composed = Gesture.Simultaneous(pinchGesture, gesture);

  // アニメーションスタイル
  const animatedStyle = useAnimatedStyle(() => ({
    width: widthX.value,
  }));
  return (
    <GestureDetector gesture={composed}>
      <Animated.ScrollView
        horizontal
        nestedScrollEnabled
        pinchGestureEnabled={false}
        scrollEnabled={scrollEnabled}
        onScroll={(d) => {
          setContentScrollPos(d.nativeEvent.contentOffset.x);
        }}
        onContentSizeChange={(d) => {
          if (d < contentScrollPos) {
            scrollRef.current?.scrollToEnd();
          }
        }}
        ref={scrollRef}
        contentContainerStyle={{
          flexDirection: "column",
        }}
      >
        <Animated.View
          style={[
            {
              backgroundColor: "white",
              width: width - 50,
              flexDirection: "row",
            },
            animatedStyle,
          ]}
        >
          {Array.from({ length: 60 }, (_, i) => i + 1).map((num) => {
            if (num % 5 === 0) {
              return (
                <Text
                  key={num}
                  style={{
                    flex: 1,
                    textAlign: "center",
                    borderRightWidth: 0.5,
                    borderColor: "#ccc",
                    flexWrap: "nowrap",
                    fontSize: 12,
                  }}
                >
                  {num - 5}
                </Text>
              );
            } else return <></>;
          })}
          <Text
            style={{
              flex: 1,
              textAlign: "center",
              borderRightWidth: 0.5,
              borderColor: "#ccc",
              flexWrap: "nowrap",
              fontSize: 12,
              width: 50
            }}
          >
            (分)
          </Text>
        </Animated.View>
        <Animated.ScrollView
          style={[{ backgroundColor: "white", width: width }, animatedStyle]}
          pinchGestureEnabled={false}
          minimumZoomScale={0.5}
          maximumZoomScale={3.0}
          scrollEnabled={scrollEnabled}
          stickyHeaderIndices={
            groupKeys.at(0) ? groupKeys.map((_, i) => i * 2) : []
          }
        >
          {groupKeys.map((hour) => [
            <View
              style={{
                backgroundColor: "white",
                padding: 5,
                borderBottomWidth: 0.5,
                borderTopWidth: 0.5,
                borderBottomColor: "#ccc",
              }}
              key={hour}
            >
              <Text style={{ fontSize: 15, zIndex: 1, backgroundColor: 'white', marginLeft: contentScrollPos }}>{hour}時台</Text>

            </View>,
            <View style={{ flexDirection: "row", position: "relative" }}>
              {groupedData[hour].map((d, i) => (
                <ExGridViewItem
                  key={d.trainNumber + i}
                  d={d}
                  index={i}
                  width={widthX}
                />
              ))}
            </View>,
          ])}
        </Animated.ScrollView>
      </Animated.ScrollView>
    </GestureDetector>
  );
};