import React, { useState } from "react";
import {
  View,
  Text,
  TouchableOpacity,
  StyleSheet,
  Modal,
  Platform,
  ScrollView,
  TextInput,
} from "react-native";
import { Ionicons } from "@expo/vector-icons";
import { useThings } from "@/state/use-thing";
import { useI18n } from "@/hooks/use-i18n";
import { useThemeContext } from "@/hooks/use-theme-context";

interface ShipOption {
  id: string;
  shipName: string;
}

interface ShipDropdownProps {
  value: ShipOption | null;
  onChange: (value: ShipOption | null) => void;
}

export default function ShipDropdown({ value, onChange }: ShipDropdownProps) {
  const { t } = useI18n();
  const { colors } = useThemeContext();
  const [isOpen, setIsOpen] = useState(false);
  const [searchText, setSearchText] = useState("");

  const { things } = useThings();

  // Convert things to ship options, filter out items without id
  const shipOptions: ShipOption[] =
    things
      ?.filter((thing) => thing.id != null)
      .map((thing) => ({
        id: thing.id as string,
        shipName: thing.metadata?.ship_name || "",
      })) || [];

  // Filter ships based on search text
  const filteredShips = shipOptions.filter((ship) => {
    const searchLower = searchText.toLowerCase();
    return ship.shipName.toLowerCase().includes(searchLower);
  });

  const handleSelect = (ship: ShipOption | null) => {
    onChange(ship);
    setIsOpen(false);
    setSearchText("");
  };

  const displayValue = value ? value.shipName : t("diary.shipDropdown.placeholder");

  const themedStyles = {
    label: { color: colors.text },
    selector: { backgroundColor: colors.card, borderColor: colors.border },
    selectorText: { color: colors.text },
    placeholder: { color: colors.textSecondary },
    modalContent: { backgroundColor: colors.card },
    searchContainer: { backgroundColor: colors.backgroundSecondary, borderColor: colors.border },
    searchInput: { color: colors.text },
    option: { borderBottomColor: colors.separator },
    selectedOption: { backgroundColor: colors.backgroundSecondary },
    optionText: { color: colors.text },
    emptyText: { color: colors.textSecondary },
  };

  return (
    <View style={styles.container}>
      <Text style={[styles.label, themedStyles.label]}>{t("diary.shipDropdown.label")}</Text>
      <TouchableOpacity
        style={[styles.selector, themedStyles.selector]}
        onPress={() => setIsOpen(true)}
        activeOpacity={0.7}
      >
        <Text style={[styles.selectorText, themedStyles.selectorText, !value && themedStyles.placeholder]}>
          {displayValue}
        </Text>
        <Ionicons name="ellipsis-horizontal" size={20} color={colors.textSecondary} />
      </TouchableOpacity>

      <Modal
        visible={isOpen}
        transparent
        animationType="fade"
        onRequestClose={() => setIsOpen(false)}
      >
        <TouchableOpacity
          style={styles.modalOverlay}
          activeOpacity={1}
          onPress={() => setIsOpen(false)}
        >
          <View
            style={[styles.modalContent, themedStyles.modalContent]}
            onStartShouldSetResponder={() => true}
          >
            {/* Search Input */}
            <View style={[styles.searchContainer, themedStyles.searchContainer]}>
              <Ionicons
                name="search"
                size={20}
                color={colors.textSecondary}
                style={styles.searchIcon}
              />
              <TextInput
                style={[styles.searchInput, themedStyles.searchInput]}
                placeholder={t("diary.shipDropdown.searchPlaceholder")}
                placeholderTextColor={colors.textSecondary}
                value={searchText}
                onChangeText={setSearchText}
                autoCapitalize="none"
              />
              {searchText.length > 0 && (
                <TouchableOpacity onPress={() => setSearchText("")}>
                  <Ionicons name="close-circle" size={20} color={colors.textSecondary} />
                </TouchableOpacity>
              )}
            </View>

            <ScrollView style={styles.optionsList}>
              {/* "All Ships" option */}
              <TouchableOpacity
                style={[
                  styles.option,
                  themedStyles.option,
                  !value && themedStyles.selectedOption,
                ]}
                onPress={() => handleSelect(null)}
              >
                <Text style={[styles.optionText, themedStyles.optionText]}>
                  {t("diary.shipDropdown.allShips")}
                </Text>
                {!value && (
                  <Ionicons name="checkmark" size={20} color={colors.primary} />
                )}
              </TouchableOpacity>

              {/* Filtered ship options */}
              {filteredShips.length > 0 ? (
                filteredShips.map((ship) => (
                  <TouchableOpacity
                    key={ship.id}
                    style={[
                      styles.option,
                      themedStyles.option,
                      value?.id === ship.id && themedStyles.selectedOption,
                    ]}
                    onPress={() => handleSelect(ship)}
                  >
                    <Text style={[styles.optionText, themedStyles.optionText]}>
                      {ship.shipName}
                    </Text>
                    {value?.id === ship.id && (
                      <Ionicons name="checkmark" size={20} color={colors.primary} />
                    )}
                  </TouchableOpacity>
                ))
              ) : (
                <View style={styles.emptyContainer}>
                  <Text style={[styles.emptyText, themedStyles.emptyText]}>
                    {t("diary.shipDropdown.noShipsFound")}
                  </Text>
                </View>
              )}
            </ScrollView>
          </View>
        </TouchableOpacity>
      </Modal>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    marginBottom: 20,
  },
  label: {
    fontSize: 16,
    fontWeight: "600",
    marginBottom: 8,
    fontFamily: Platform.select({
      ios: "System",
      android: "Roboto",
      default: "System",
    }),
  },
  selector: {
    flexDirection: "row",
    justifyContent: "space-between",
    alignItems: "center",
    borderWidth: 1,
    borderRadius: 8,
    paddingHorizontal: 16,
    paddingVertical: 12,
  },
  selectorText: {
    fontSize: 16,
    flex: 1,
    fontFamily: Platform.select({
      ios: "System",
      android: "Roboto",
      default: "System",
    }),
  },
  modalOverlay: {
    flex: 1,
    backgroundColor: "rgba(0, 0, 0, 0.5)",
    justifyContent: "center",
    alignItems: "center",
  },
  modalContent: {
    borderRadius: 12,
    width: "85%",
    maxHeight: "70%",
    overflow: "hidden",
    shadowColor: "#000",
    shadowOffset: {
      width: 0,
      height: 4,
    },
    shadowOpacity: 0.3,
    shadowRadius: 8,
    elevation: 8,
  },
  searchContainer: {
    flexDirection: "row",
    alignItems: "center",
    paddingHorizontal: 16,
    paddingVertical: 12,
    borderBottomWidth: 1,
  },
  searchIcon: {
    marginRight: 8,
  },
  searchInput: {
    flex: 1,
    fontSize: 16,
    padding: 0,
    fontFamily: Platform.select({
      ios: "System",
      android: "Roboto",
      default: "System",
    }),
  },
  optionsList: {
    maxHeight: 350,
  },
  option: {
    flexDirection: "row",
    justifyContent: "space-between",
    alignItems: "center",
    paddingHorizontal: 20,
    paddingVertical: 16,
    borderBottomWidth: 1,
  },
  optionText: {
    fontSize: 16,
    fontFamily: Platform.select({
      ios: "System",
      android: "Roboto",
      default: "System",
    }),
  },
  emptyContainer: {
    paddingVertical: 24,
    alignItems: "center",
  },
  emptyText: {
    fontSize: 14,
    fontFamily: Platform.select({
      ios: "System",
      android: "Roboto",
      default: "System",
    }),
  },
});
