import {
  View,
  Text,
  TouchableOpacity,
  Modal,
  PanResponder,
  Dimensions,
} from "react-native";
import React, { useState, useEffect, useRef } from "react";
import { useTailwind } from "tailwind-rn";
import { Image } from "expo-image";
export default function MySlider({
  lower_bound,
  upper_bound,
  step,
  unit,
  lable,
  height = 60,
  width = Dimensions.get("window").width - 48,
  onChange,
  onAfterChange = () => {},
  defaultValue = 0,
  disabled = false,
  thumbSize = 25,
  stepValues = [],
  itemKey,
  hasInfinity,
  leftValue = 0,
  rightValue = 0,
  thumbImage = null,
  maximumTrackTintColor = "#dcdbdb",
  minimumTrackTintColor = "#577BFF",
  processHeight = 7,
}) {
  // const leftProcess = useRef(0);
  // const rightProcess = useRef(0);

  const [leftProcess, setLeftProcess] = useState(0);
  const [rightProcess, setRightProcess] = useState(0);
  const [stepNum, setStepNum] = useState(stepValues.length - 1);
  const [processWidth, setProcessWidth] = useState(330);
  const tailwind = useTailwind();
  const leftWatcher = useRef(null);
  const rightWatcher = useRef(null);
  useEffect(() => {
    leftWatcher.current = PanResponder.create({
      // 建立监视器
      onStartShouldSetPanResponder: () => true,
      onPanResponderGrant: _onPanResponderGrantLeft, // 按下
      onPanResponderMove: _onPanResponderMoveLeft, // 移动
      onPanResponderEnd: _onPanResponderEndLeft, // 结束
    });
    rightWatcher.current = PanResponder.create({
      // 建立监视器
      onStartShouldSetPanResponder: () => true,
      onPanResponderGrant: _onPanResponderGrantRight, // 按下
      onPanResponderMove: _onPanResponderMoveRight, // 移动
      onPanResponderEnd: _onPanResponderEndRight, // 结束
    });
    setProcessWidth(width - thumbSize * 2);
  }, []);
  useEffect(() => {
    // if(itemKey)
    const currentLeftProcess = 0;
    const currentRightProcess =
      (stepValues.indexOf(rightValue) * step - lower_bound) /
      (upper_bound - lower_bound);
    setLeftProcess(currentLeftProcess);
    setRightProcess(currentRightProcess);
  }, [leftValue, rightValue]);
  // useEffect(() => {

  // }, [leftProcess, rightProcess]);
  // 左侧滑块事件
  const _onPanResponderGrantLeft = (e, gestureState) => {
    const process = (gestureState.x0 - 40 - thumbSize / 2) / processWidth;
    _changeProcess(process, "left");
  };

  const _onPanResponderEndLeft = (e, gestureState) => {
    if (onAfterChange) {
      onAfterChange(gestureState.x0);
    }
  };
  const _onPanResponderMoveLeft = (e, gestureState) => {
    const process =
      (gestureState.x0 - 40 - thumbSize / 2 + gestureState.dx) / processWidth;
    _changeProcess(process, "left");
  };

  // 右侧滑块事件
  const _onPanResponderGrantRight = (e, gestureState) => {
    const process = (gestureState.x0 - 40 - thumbSize / 2) / processWidth;
    _changeProcess(process, "right");
  };

  const _onPanResponderEndRight = (e, gestureState) => {
    if (onAfterChange) {
      onAfterChange(gestureState.x0);
    }
  };
  const _onPanResponderMoveRight = (e, gestureState) => {
    const process =
      (gestureState.x0 - 40 - thumbSize / 2 + gestureState.dx) / processWidth;
    _changeProcess(process, "right");
  };
  const _changeProcess = (changeProcess, direction) => {
    // 判断滑动开关
    if (disabled) return;
    if (changeProcess >= 0 && changeProcess <= 1) {
      // 按步长比例变化刻度
      const v = changeProcess * (upper_bound - lower_bound);
      const newValue = Math.round(v / step) * step;
      const newProcess = Math.round(newValue) / (upper_bound - lower_bound);
      setStepNum(stepNum + 1);
      if (process !== newProcess) {
        if (direction == "left") {
          if (newProcess < rightProcess) {
            setLeftProcess(newProcess);
            setStepNum((old) => old + 1);
            onChange({
              lower_bound: Math.round(
                leftProcess * (upper_bound - lower_bound) + lower_bound
              ),
              upper_bound: rightValue,
            });
          }
        } else {
          if (newProcess > leftProcess) {
            // rightProcess.current = newProcess;
            setRightProcess(newProcess);
            setStepNum((old) => old - 1);
            onChange({
              lower_bound: leftValue,
              upper_bound:
                stepValues[
                  Math.round(
                    (newProcess * (upper_bound - lower_bound) + lower_bound) /
                      step
                  )
                ],
            });
            // setStepNum(stepNum - 1);
          }
        }
      }
    }
  };
  return (
    <View
      // style={[
      //   styles.container,
      //   {
      //     height,
      //     width,
      //   },
      // ]}
      style={{
        height: "upper_bound-content",
        width,
        // flex: 1,
        flexDirection: "row",
        justifyContent: "center",
        alignItems: "center",
        marginBottom: 36,
        marginTop: 12,
      }}
    >
      <View style={{ width: "100%", position: "relative" }}>
        <View
          style={{
            backgroundColor: maximumTrackTintColor,
            // flex: 1,
            height: processHeight,
            width: processWidth,
            // marginRight: thumbSize / 2,
            position: "absolute",
            marginTop: -processHeight / 2,
            left: thumbSize / 2,
            zIndex: 1,
            borderRadius: 50,
          }}
        />
        <View
          style={{
            backgroundColor: minimumTrackTintColor,
            width: (rightProcess - leftProcess) * processWidth,
            height: processHeight,
            marginLeft: thumbSize / 2 + leftProcess * processWidth,
            position: "absolute",
            marginTop: -processHeight / 2,
            left: 0,
            zIndex: 10,
            borderRadius: 50,
          }}
        />
      </View>
      <View
        transition={1000}
        cachePolicy="disk"
        // style={tailwind("w-full h-full rounded-lg overflow-hidden")}
        style={{
          width: thumbSize,
          height: thumbSize,
          borderRadius: 50,
          position: "absolute",
          left: leftProcess * processWidth,
          marginTop: -processHeight / 2,
          zIndex: 10,
          backgroundColor: "#ff75c8",
          borderColor: "#ffffff",
          borderWidth: 2,
        }}
        {...leftWatcher.current?.panHandlers}
      />
      <View
        transition={1000}
        cachePolicy="disk"
        // style={tailwind("w-full h-full rounded-lg overflow-hidden")}
        style={{
          width: thumbSize,
          height: thumbSize,
          backgroundColor: "#fff",
          borderRadius: 50,
          position: "absolute",
          left: rightProcess * processWidth,
          zIndex: 10,
          backgroundColor: "#ff75c8",
          borderColor: "#ffffff",
          borderWidth: 2,
        }}
        {...rightWatcher.current?.panHandlers}
      ></View>
      <View
        style={{
          ...tailwind("flex flex-row justify-between items-center"),
          position: "absolute",
          top: -46,
          right: 12,
        }}
      >
        <Text
          style={{
            ...tailwind("text-white text-lg"),
            maxWidth: thumbSize * 2,
            color: "#ff75c8",
          }}
        >
          {Math.round(leftProcess * (upper_bound - lower_bound) + lower_bound)}
        </Text>
        <Text
          style={{
            ...tailwind("text-lg"),
            marginHorizontal: 4,
            color: "#ff75c8",
          }}
        >
          -
        </Text>
        <Text
          style={{
            ...tailwind("text-white text-lg"),
            // maxWidth: thumbSize * 2,
            color: "#ff75c8",
          }}
        >
          {hasInfinity && rightProcess == 1
            ? ">" + upper_bound
            : stepValues[
                Math.round(
                  (rightProcess * (upper_bound - lower_bound) + lower_bound) /
                    step
                )
              ]}
        </Text>
        <Text
          style={{
            ...tailwind("text-white text-lg"),
            maxWidth: thumbSize * 2,
            color: "#ff75c8",
          }}
        >
          {unit}
        </Text>
      </View>
      <Text
        style={{
          ...tailwind("absolute text-white text-sm"),
          left: 0,
          top: 20,
          minWidth: thumbSize,
          maxWidth: thumbSize * 2,
          color: "#ffffff80",
        }}
      >
        {lower_bound}
      </Text>
      <Text
        style={{
          ...tailwind("absolute text-white text-sm"),
          left: processWidth,
          top: 20,
          minWidth: thumbSize,
          maxWidth: thumbSize * 2,
          color: "#ffffff80",
        }}
      >
        {hasInfinity ? ">" + upper_bound : upper_bound}
      </Text>
    </View>
  );
}