import { ActivityIndicator, Text, View } from "react-native";
import BaseBackground from "../../components/BaseBackground";
import BaseButton, { BaseButtonProps } from "../../components/BaseButton";
import { useThemeStore } from "../../stores/ThemeStore";
import { AuthService } from "../../services/AuthService";
import { router } from "expo-router";
import { Ionicons } from "@expo/vector-icons";
import { SimpleHeader } from "../../components/Header";
import { THEMES } from "../../Themes";
import CustomTextInput from "../../components/CustomTextInput";
import { useCallback, useRef, useState } from "react";
import { CaldavConfigService } from "../../services/CaldavConfigService";
import { useCaldavConfigStore } from "../../stores";

const handleLogout = async () => {
  await AuthService.logout();
  router.replace("/login");
};

const SettingsButton = (props: BaseButtonProps) => {
  return (
    <BaseButton
      testID={props.testID}
      onPress={props.onPress}
      solid={props.solid}
      className={"w-11/12"}
    >
      {props.children}
    </BaseButton>
  );
};

type CaldavTextInputProps = {
  title: string;
  value: string;
  onValueChange: (text: string) => void;
  secureTextEntry?: boolean;
};

const CaldavTextInput = ({
  title,
  value,
  onValueChange,
  secureTextEntry,
}: CaldavTextInputProps) => {
  const { theme } = useThemeStore();
  return (
    <View className="flex flex-row items-center py-1">
      <Text className="ml-4 w-24" style={{ color: theme.textPrimary }}>
        {title}:
      </Text>
      <CustomTextInput
        className="flex-1 mr-4 px-3 py-2"
        text={value}
        onValueChange={onValueChange}
        secureTextEntry={secureTextEntry}
      />
    </View>
  );
};

type Feedback = { text: string; isError: boolean; loading: boolean };

const FeedbackRow = ({ feedback }: { feedback: Feedback | null }) => {
  const { theme } = useThemeStore();
  if (!feedback) return null;
  return (
    <View className="flex flex-row items-center justify-center mt-2 mx-4 gap-2">
      {feedback.loading && (
        <ActivityIndicator size="small" color={theme.textMuted} />
      )}
      <Text
        style={{
          color: feedback.loading
            ? theme.textMuted
            : feedback.isError
              ? theme.rejectButton
              : theme.confirmButton,
        }}
      >
        {feedback.text}
      </Text>
    </View>
  );
};

const CaldavSettings = () => {
  const { theme } = useThemeStore();
  const { config, setConfig } = useCaldavConfigStore();

  const [serverUrl, setServerUrl] = useState(config?.serverUrl ?? "");
  const [username, setUsername] = useState(config?.username ?? "");
  const [password, setPassword] = useState(config?.password ?? "");
  const [saveFeedback, setSaveFeedback] = useState<Feedback | null>(null);
  const [syncFeedback, setSyncFeedback] = useState<Feedback | null>(null);
  const saveTimer = useRef<ReturnType<typeof setTimeout> | null>(null);
  const syncTimer = useRef<ReturnType<typeof setTimeout> | null>(null);

  const showFeedback = useCallback(
    (
      setter: typeof setSaveFeedback,
      timer: typeof saveTimer,
      text: string,
      isError: boolean,
      loading = false,
    ) => {
      if (timer.current) clearTimeout(timer.current);
      setter({ text, isError, loading });
      if (!loading) {
        timer.current = setTimeout(() => setter(null), 3000);
      }
    },
    [],
  );

  const saveConfig = async () => {
    showFeedback(
      setSaveFeedback,
      saveTimer,
      "Speichere Konfiguration...",
      false,
      true,
    );
    try {
      const saved = await CaldavConfigService.saveConfig(
        serverUrl,
        username,
        password,
      );
      setConfig(saved);
      showFeedback(
        setSaveFeedback,
        saveTimer,
        "Konfiguration wurde gespeichert",
        false,
      );
    } catch {
      showFeedback(
        setSaveFeedback,
        saveTimer,
        "Fehler beim Speichern der Konfiguration",
        true,
      );
    }
  };

  const sync = async () => {
    showFeedback(setSyncFeedback, syncTimer, "Synchronisiere...", false, true);
    try {
      await CaldavConfigService.sync();
      showFeedback(
        setSyncFeedback,
        syncTimer,
        "Synchronisierung erfolgreich",
        false,
      );
    } catch {
      showFeedback(
        setSyncFeedback,
        syncTimer,
        "Fehler beim Synchronisieren",
        true,
      );
    }
  };

  return (
    <>
      <View>
        <Text
          className="text-center text-2xl"
          style={{ color: theme.textPrimary }}
        >
          Caldav Config
        </Text>
      </View>
      <View>
        <View className="pb-1">
          <CaldavTextInput
            title="url"
            value={serverUrl}
            onValueChange={setServerUrl}
          />
          <CaldavTextInput
            title="username"
            value={username}
            onValueChange={setUsername}
          />
          <CaldavTextInput
            title="password"
            value={password}
            onValueChange={setPassword}
            secureTextEntry
          />
        </View>
        <View className="flex flex-row">
          <BaseButton className="mx-4 w-1/5" solid={true} onPress={saveConfig}>
            Save
          </BaseButton>
          <BaseButton className="w-1/5" solid={true} onPress={sync}>
            Sync
          </BaseButton>
        </View>
        <FeedbackRow feedback={saveFeedback} />
        <FeedbackRow feedback={syncFeedback} />
      </View>
    </>
  );
};

const Settings = () => {
  const { theme, setTheme } = useThemeStore();

  return (
    <BaseBackground>
      <SimpleHeader text="Settings" />
      <View className="flex items-center mt-4">
        <SettingsButton
          testID="settings-logout-button"
          onPress={handleLogout}
          solid={true}
        >
          <Ionicons name="log-out-outline" size={24} color={theme.primeFg} />{" "}
          Logout
        </SettingsButton>
        <View>
          <Text
            className="text-center text-2xl"
            style={{ color: theme.textPrimary }}
          >
            Select Theme
          </Text>
        </View>
        <SettingsButton
          solid={theme == THEMES.defaultLight}
          onPress={() => {
            setTheme("defaultLight");
          }}
        >
          Default Light
        </SettingsButton>
        <SettingsButton
          solid={theme == THEMES.defaultDark}
          onPress={() => {
            setTheme("defaultDark");
          }}
        >
          Default Dark
        </SettingsButton>
      </View>
      <CaldavSettings />
    </BaseBackground>
  );
};

export default Settings;
