import {FlatList, StyleSheet} from "react-native";
import React, {useEffect, useState} from "react";
import {Button, Text, View} from "react-native-ui-lib";
import GroceryItem from "./GroceryItem";
import {GroceryCategory, GroceryFrequency, useGroceryContext,} from "@/contexts/GroceryContext";
import HeaderTemplate from "@/components/shared/HeaderTemplate";
import {AntDesign, MaterialIcons} from "@expo/vector-icons";
import EditGroceryItem from "./EditGroceryItem";
import {ProfileType, useAuthContext} from "@/contexts/AuthContext";
import {IGrocery} from "@/hooks/firebase/types/groceryData";

const GroceryList = () => {
  const {
    groceries,
    updateGroceryItem,
    isAddingGrocery,
    setIsAddingGrocery,
    addGrocery,
  } = useGroceryContext();
  const { profileData } = useAuthContext();
  const [approvedGroceries, setapprovedGroceries] = useState<IGrocery[]>(
    groceries?.filter((item) => item.approved === true)
  );
  const [pendingGroceries, setPendingGroceries] = useState<IGrocery[]>(
    groceries?.filter((item) => item.approved !== true)
  );
  const [category, setCategory] = useState<GroceryCategory>(
    GroceryCategory.Bakery
  );
  const [title, setTitle] = useState<string>("");
  const [submit, setSubmitted] = useState<boolean>(false);

  const [pendingVisible, setPendingVisible] = useState<boolean>(true);
  const [approvedVisible, setApprovedVisible] = useState<boolean>(true);

  // Group approved groceries by category
  const approvedGroceriesByCategory = approvedGroceries?.reduce(
    (groups: any, item: IGrocery) => {
      const category = item.category || "Uncategorized";
      if (!groups[category]) {
        groups[category] = [];
      }
      groups[category].push(item);
      return groups;
    },
    {}
  );

  useEffect(() => {
    if (submit) {
      if (title?.length > 2 && title?.length <= 25) {
        addGrocery({
          id: "",
          title: title,
          category: category,
          approved: profileData?.userType === ProfileType.PARENT,
          recurring: false,
          frequency: GroceryFrequency.Never,
          bought: false,
        });

        setIsAddingGrocery(false);
        setSubmitted(false);
        setTitle("");
      }
    }
  }, [submit]);

  useEffect(() => {
    /**/
  }, [category]);

  useEffect(() => {
    setapprovedGroceries(groceries?.filter((item) => item.approved === true));
    setPendingGroceries(groceries?.filter((item) => item.approved !== true));
  }, [groceries]);

  return (
    <View marginH-20 marginB-20>
      <HeaderTemplate
        message={"Welcome to your grocery list"}
        isWelcome={false}
      >
        <View row spread gap-5>
          <View
            backgroundColor="#e2eed8"
            padding-8
            style={{ borderRadius: 50 }}
          >
            <Text text70BL color="#46a80a">
              {approvedGroceries?.length} list{" "}
              {approvedGroceries?.length === 1 ? (
                <Text text70BL color="#46a80a">
                  item
                </Text>
              ) : (
                <Text text70BL color="#46a80a">
                  items
                </Text>
              )}
            </Text>
          </View>
          <View
            backgroundColor="#faead2"
            padding-8
            style={{ borderRadius: 50 }}
          >
            <Text text70BL color="#e28800">
              {pendingGroceries?.length} pending
            </Text>
          </View>
          <Button
            backgroundColor="transparent"
            paddingH-10
            iconSource={() => (
              <MaterialIcons name="person-add-alt" size={24} color="gray" />
            )}
          />
        </View>
      </HeaderTemplate>

      {/* Pending Approval Section */}
      <View row spread marginT-40 marginB-10 centerV>
        <View row centerV>
          <Text text70BL>Pending Approval</Text>
          {pendingVisible && (
            <AntDesign
              name="down"
              size={17}
              style={styles.dropIcon}
              color="#9f9f9f"
              onPress={() => {
                setPendingVisible(false);
              }}
            />
          )}
          {!pendingVisible && (
            <AntDesign
              name="right"
              size={15}
              style={styles.dropIcon}
              color="#9f9f9f"
              onPress={() => {
                setPendingVisible(true);
              }}
            />
          )}
        </View>
        <View
          centerV
          style={{
            aspectRatio: 1,
            width: 35,
            backgroundColor: "#faead2",
            borderRadius: 50,
          }}
        >
          <Text text70 center color="#e28800">
            {pendingGroceries?.length.toString()}
          </Text>
        </View>
      </View>
      {pendingGroceries?.length > 0
        ? pendingVisible && (
            <FlatList
              data={pendingGroceries}
              renderItem={({ item }) => (
                <GroceryItem
                  item={item}
                  handleItemApproved={(id, changes) => updateGroceryItem({...changes, id: id})}
                />
              )}
              keyExtractor={(item) => item.id.toString()}
            />
          )
        : pendingVisible && <Text>No items pending approval.</Text>}

      {/* Approved Section */}
      <View row spread marginT-40 marginB-0 centerV>
        <View row centerV>
          <Text text70BL>Shopping List</Text>
          {approvedVisible && (
            <AntDesign
              name="down"
              size={17}
              style={styles.dropIcon}
              color="#9f9f9f"
              onPress={() => {
                setApprovedVisible(false);
              }}
            />
          )}
          {!approvedVisible && (
            <AntDesign
              name="right"
              size={15}
              style={styles.dropIcon}
              color="#9f9f9f"
              onPress={() => {
                setApprovedVisible(true);
              }}
            />
          )}
        </View>
        <View
          centerV
          style={{
            aspectRatio: 1,
            width: 35,
            backgroundColor: "#e2eed8",
            borderRadius: 50,
          }}
        >
          <Text text70 center color="#46a80a">
            {approvedGroceries?.length.toString()}
          </Text>
        </View>
      </View>
      {isAddingGrocery && (
        <EditGroceryItem
          editGrocery={{
            title: title,
            setCategory: setCategory,
            category: category,
            setTitle: setTitle,
            setSubmit: setSubmitted,
          }}
        />
      )}

      {/* Render Approved Groceries Grouped by Category */}
      {approvedGroceries?.length > 0
        ? approvedVisible && (
            <FlatList
              data={Object.keys(approvedGroceriesByCategory)}
              renderItem={({ item: category }) => (
                <View key={category}>
                  {/* Render Category Header */}
                  <Text text80M style={{ marginTop: 10 }} color="#666">
                    {category}
                  </Text>
                  {/* Render Grocery Items for this Category */}
                  {approvedGroceriesByCategory[category].map(
                    (grocery: IGrocery) => (
                      <GroceryItem
                        key={grocery.id}
                        item={grocery}
                        handleItemApproved={(id, changes) => updateGroceryItem({...changes, id: id})}
                      />
                    )
                  )}
                </View>
              )}
              keyExtractor={(category) => category}
            />
          )
        : approvedVisible && <Text>No approved items.</Text>}
    </View>
  );
};

const styles = StyleSheet.create({
  dropIcon: {
    marginHorizontal: 10,
  },
});

export default GroceryList;