import { View, StyleSheet, Image, Platform, Text } from "react-native";
import React, { useMemo, useState, useCallback, useEffect } from "react";
import Animated, { useAnimatedRef } from "react-native-reanimated";
import { BlurView } from "expo-blur";
import CreateLyricsHeader from "./components/CreateLyricsHeader";
import { Palette, Style } from "../../styles";
import { FONT_FAMILY } from "../../styles/Fonts";
import Sortable from "react-native-sortables";
import { icons } from "../../assets";

// baseStructure: array like ['couplet','refrain',...]
// onChange: callback that receives array like ['couplet','refrain',...]
const CustomizeSongStructure = ({ baseStructure = [], onChange }) => {
  const [containerLayout, setContainerLayout] = useState(null);
  const scrollRef = useAnimatedRef();

  // Build stable keyed data like { 'couplet-1': { label, value }, ... }
  const data = useMemo(() => {
    const counters = { couplet: 0, refrain: 0 };
    const out = {};
    (baseStructure || []).forEach((type) => {
      const key = (type || "").toLowerCase();
      counters[key] = (counters[key] || 0) + 1;
      const idx = counters[key];
      const id = `${key}-${idx}`;
      out[id] = {
        id,
        label: `${key === "couplet" ? "Couplet" : "Refrain"} ${idx}`,
        value: key,
      };
    });
    return out;
  }, [baseStructure]);

  const items = useMemo(() => Object.values(data), [data]);

  // Initialize parent with current order (so it's saved even without drag)
  useEffect(() => {
    const initialValues = (items || []).map((it) => it?.value).filter(Boolean);
    onChange?.(initialValues);
    // We only want to run when baseStructure-derived items change
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [items.length]);

  const Row = ({ item: rowData }) => (
    <View style={styles.itemContainer}>
      <BlurView
        intensity={Platform.OS !== "ios" ? 10 : 30}
        style={styles.rowBlur}
        // experimentalBlurMethod={Platform.OS !== "ios" ? "dimezisBlurView" : "none"}
      >
        <View style={{ ...Style.containerSpaceBetween, alignItems: "center" }}>
          <View>
            <View>
              <View>
                <View />
              </View>
            </View>
            <View>
              <View />
            </View>
          </View>
          <View style={{ flex: 1, justifyContent: "center" }}>
            <View>
              <Text style={styles.rowText}>{rowData?.label || ""}</Text>
            </View>
          </View>
          <Sortable.Handle>
            <Image source={icons.dragDots} style={styles.handleIcon} />
          </Sortable.Handle>
        </View>
      </BlurView>
    </View>
  );

  return (
    <View style={{ flex: 1, gap: 10, marginTop: 16 }}>
      <CreateLyricsHeader
        title="Personnalise la structure de ta chanson"
        subTitle="Réorganise par glisser-déposer"
      />
      <View
        style={{ flex: 1 }}
        onLayout={(e) => setContainerLayout(e.nativeEvent.layout)}
      >
        <Animated.ScrollView
          ref={scrollRef}
          contentContainerStyle={{ paddingVertical: 4, paddingBottom: 24 }}
          showsVerticalScrollIndicator={false}
        >
          <Sortable.Grid
            columns={1}
            rowGap={12}
            data={items}
            renderItem={({ item }) => <Row item={item} />}
            customHandle
            // Enable auto-scroll when dragging near edges
            scrollableRef={scrollRef}
            onDragEnd={({ data: newData }) => {
              const values = (newData || [])
                .map((it) => it?.value)
                .filter(Boolean);
              onChange?.(values);
            }}
          />
        </Animated.ScrollView>
      </View>
    </View>
  );
};

export default CustomizeSongStructure;

const styles = StyleSheet.create({
  itemContainer: {
    height: 54,
    backgroundColor: Palette.glass,
    borderRadius: 14,
    overflow: "hidden",
    shadowColor: "#00000040",
    shadowOffset: {
      width: 0,
      height: 2,
    },
    shadowOpacity: 0.25,
    shadowRadius: 3.84,
    elevation: 5,
  },
  rowBlur: {
    flex: 1,
    backgroundColor: Palette.glass,
    justifyContent: "center",
    paddingHorizontal: 12,
    height: "100%",
  },
  rowText: {
    fontSize: 16,
    color: Palette.white,
    fontFamily: FONT_FAMILY.InterRegular,
  },
  handleIcon: {
    width: 22,
    height: 22,
    tintColor: Palette.white,
  },
});