import { createApiClient } from '@pipu/api-client';
import { checkServer, normalizeServerUrl, type ServerCheck } from '@pipu/core';
import { useQuery } from '@tanstack/react-query';
import Constants from 'expo-constants';
import { useState } from 'react';
import { useTranslation } from 'react-i18next';
import { Pressable, ScrollView, Text, View } from 'react-native';

import { useSessionCtx } from '../lib/session';
import { forgetServer, loadServers } from '../lib/storage';
import { radius, useColors } from '../theme';
import { Button, ErrorBox, Field, H1, Icon, Muted, Screen } from '../ui/kit';

const appVersionCode = Number(Constants.expoConfig?.extra?.versionCode ?? 0);

/** Подключение: адрес → проверка /server-info (версия, совместимость) → вход. */
export default function ConnectScreen() {
  const colors = useColors();
  const { t } = useTranslation();
  const { connect } = useSessionCtx();
  const [address, setAddress] = useState('');
  const [checking, setChecking] = useState(false);
  const [result, setResult] = useState<ServerCheck | 'invalid' | null>(null);
  const servers = useQuery({ queryKey: ['saved-servers'], queryFn: loadServers });

  const onConnect = async (raw = address) => {
    const baseUrl = normalizeServerUrl(raw);
    if (!baseUrl) return setResult('invalid');
    setChecking(true);
    const res = await checkServer(createApiClient({ baseUrl }), appVersionCode);
    setChecking(false);
    setResult(res);
    if (res.status === 'ok') await connect(baseUrl, res.info.version);
  };

  return (
    <Screen>
      <ScrollView contentContainerStyle={{ padding: 20, gap: 14, flexGrow: 1, justifyContent: 'center' }} keyboardShouldPersistTaps="handled">
        <H1>{t('app.name')}</H1>
        <Muted>{t('app.tagline')}</Muted>
        <Field
          label={t('server.address')}
          value={address}
          onChangeText={setAddress}
          onSubmitEditing={() => void onConnect()}
          placeholder="https://music.home.lan"
          keyboardType="url"
          editable={!checking}
        />
        {result === 'invalid' && <ErrorBox>{t('server.invalid_address')}</ErrorBox>}
        {result !== null && result !== 'invalid' && result.status === 'unsupported_app' && (
          <ErrorBox>{t('server.unsupported_app')}</ErrorBox>
        )}
        {result !== null && result !== 'invalid' && result.status === 'offline' && <ErrorBox>{t('server.offline')}</ErrorBox>}
        <Button title={t('mobile.connect')} onPress={() => void onConnect()} busy={checking} disabled={!address.trim()} />

        {!!servers.data?.length && (
          <View style={{ gap: 8, marginTop: 16 }}>
            <Text style={{ color: colors.text3, fontSize: 12, fontWeight: '700', textTransform: 'uppercase' }}>
              {t('mobile.servers')}
            </Text>
            {servers.data.map((sv) => (
              <View key={sv.url} style={{ flexDirection: 'row', alignItems: 'center', gap: 10, padding: 12, borderRadius: radius.md, backgroundColor: colors.surface }}>
                <Pressable style={{ flex: 1 }} onPress={() => void onConnect(sv.url)} accessibilityRole="button">
                  <Text style={{ color: colors.text, fontWeight: '600' }}>{sv.url.replace(/^https?:\/\//, '')}</Text>
                  <Text style={{ color: colors.text3, fontSize: 12 }}>pipu {sv.version}</Text>
                </Pressable>
                <Pressable
                  onPress={() => void forgetServer(sv.url).then(() => servers.refetch())}
                  hitSlop={10}
                  accessibilityRole="button"
                  accessibilityLabel={t('mobile.forget_server')}
                >
                  <Icon name="close" size={20} color={colors.text3} />
                </Pressable>
              </View>
            ))}
          </View>
        )}
      </ScrollView>
    </Screen>
  );
}