import DevicesScreen from "@/components/manager/devices";
import FleetsScreen from "@/components/manager/fleets";
import ShipsScreen from "@/components/manager/ships";
import { ThemedText } from "@/components/themed-text";
import { ThemedView } from "@/components/themed-view";
import { Colors } from "@/config";
import { ColorScheme, useTheme } from "@/hooks/use-theme-context";
import { useEffect, useMemo, useRef, useState } from "react";
import { Animated, StyleSheet, TouchableOpacity, View } from "react-native";
import { SafeAreaView } from "react-native-safe-area-context";

export default function manager() {
  const { colors, colorScheme } = useTheme();
  const styles = useMemo(
    () => createStyles(colors, colorScheme),
    [colors, colorScheme]
  );

  const [selected, setSelected] = useState<"ships" | "devices" | "fleets">(
    "ships"
  );
  const [containerWidth, setContainerWidth] = useState(0);
  const indicatorTranslate = useRef(new Animated.Value(0)).current;
  const SEGMENT_COUNT = 3;
  const indexMap: Record<string, number> = {
    ships: 0,
    devices: 1,
    fleets: 2,
  };

  const SegmentButton = ({
    label,
    active,
    onPress,
  }: {
    label: string;
    active?: boolean;
    onPress?: () => void;
  }) => {
    return (
      <TouchableOpacity
        style={[styles.segmentButton, active && styles.segmentButtonActive]}
        onPress={onPress}
        activeOpacity={0.8}
      >
        <ThemedText
          style={[styles.segmentText, active && styles.segmentTextActive]}
        >
          {label}
        </ThemedText>
      </TouchableOpacity>
    );
  };

  useEffect(() => {
    if (containerWidth <= 0) return;
    const segmentWidth = containerWidth / SEGMENT_COUNT;
    const toValue = indexMap[selected] * segmentWidth;
    Animated.spring(indicatorTranslate, {
      toValue,
      useNativeDriver: true,
      friction: 14,
      tension: 100,
    }).start();
  }, [selected, containerWidth, indicatorTranslate]);
  return (
    <SafeAreaView style={{ flex: 1 }} edges={["top"]}>
      <ThemedView style={styles.scrollContent}>
        <View style={styles.container}>
          <ThemedView style={styles.header}>
            <View
              style={styles.segmentContainer}
              onLayout={(e) => setContainerWidth(e.nativeEvent.layout.width)}
            >
              {/* sliding indicator */}
              {containerWidth > 0 && (
                <Animated.View
                  style={[
                    styles.indicator,
                    {
                      width: Math.max(containerWidth / SEGMENT_COUNT - 8, 0),
                      transform: [{ translateX: indicatorTranslate }],
                    },
                  ]}
                />
              )}

              <SegmentButton
                label="Tàu"
                active={selected === "ships"}
                onPress={() => setSelected("ships")}
              />
              <SegmentButton
                label="Thiết bị"
                active={selected === "devices"}
                onPress={() => setSelected("devices")}
              />
              <SegmentButton
                label="Đội tàu"
                active={selected === "fleets"}
                onPress={() => setSelected("fleets")}
              />
            </View>
          </ThemedView>

          <View style={styles.contentWrapper}>
            {selected === "ships" && <ShipsScreen />}
            {selected === "devices" && <DevicesScreen />}
            {selected === "fleets" && <FleetsScreen />}
          </View>
        </View>
      </ThemedView>
    </SafeAreaView>
  );
}

const createStyles = (colors: typeof Colors.light, scheme: ColorScheme) =>
  StyleSheet.create({
    scrollContent: {
      flexGrow: 1,
    },
    container: {
      alignItems: "center",
      flex: 1,
    },

    header: {
      width: "100%",
      paddingVertical: 8,
      paddingHorizontal: 4,
    },
    segmentContainer: {
      flexDirection: "row",
      backgroundColor: colors.backgroundSecondary,
      borderRadius: 10,
      padding: 4,
      alignSelf: "stretch",
    },
    segmentButton: {
      flex: 1,
      paddingVertical: 8,
      alignItems: "center",
      justifyContent: "center",
      borderRadius: 8,
    },
    segmentButtonActive: {
      backgroundColor: scheme === "dark" ? "#435B66" : colors.surface,
      shadowColor: scheme === "dark" ? "transparent" : "#000",
      shadowOpacity: scheme === "dark" ? 0 : 0.1,
      shadowRadius: 4,
      elevation: scheme === "dark" ? 0 : 2,
    },
    segmentText: {
      fontSize: 14,
      fontWeight: "600",
      color: colors.textSecondary,
    },
    segmentTextActive: {
      color: colors.text,
    },
    indicator: {
      position: "absolute",
      left: 4,
      top: 4,
      bottom: 4,
      backgroundColor: scheme === "dark" ? "#435B66" : colors.surface,
      borderRadius: 8,
      shadowColor: scheme === "dark" ? "transparent" : "#000",
      shadowOpacity: scheme === "dark" ? 0 : 0.1,
      shadowRadius: 4,
      elevation: scheme === "dark" ? 0 : 2,
    },
    contentWrapper: {
      flex: 1,
      alignSelf: "stretch",
      width: "100%",
    },
  });