import { useSQLiteContext } from 'expo-sqlite';
import { useState } from 'react';
import {
  Platform, Pressable, ScrollView, StyleSheet,
  Text, TextInput, View,
} from 'react-native';
import { getSetting, setSetting, useSetting } from '@/db/queries';

export default function SettingsScreen() {
  const db = useSQLiteContext();

  const storedUrl = useSetting('instance_url') ?? '';
  const storedHandle = useSetting('handle') ?? '';
  const storedPath = useSetting('auto_import_path') ?? '';

  const [instanceUrl, setInstanceUrl] = useState(storedUrl);
  const [handle, setHandle] = useState(storedHandle);
  const [autoPath, setAutoPath] = useState(storedPath);
  const [saved, setSaved] = useState(false);

  async function save() {
    await setSetting(db, 'instance_url', instanceUrl.trim());
    await setSetting(db, 'handle', handle.trim());
    if (Platform.OS === 'android') {
      await setSetting(db, 'auto_import_path', autoPath.trim());
    }
    setSaved(true);
    setTimeout(() => setSaved(false), 2000);
  }

  return (
    <ScrollView style={styles.container} contentContainerStyle={styles.content}>
      <Text style={styles.header}>Settings</Text>

      <Section title="Instance (optional)">
        <Field
          label="Instance URL"
          placeholder="https://bincio.org"
          value={instanceUrl}
          onChangeText={setInstanceUrl}
          autoCapitalize="none"
          keyboardType="url"
        />
        <Field
          label="Handle"
          placeholder="yourhandle"
          value={handle}
          onChangeText={setHandle}
          autoCapitalize="none"
        />
        <Text style={styles.hint}>
          Leave blank to use the app without a remote instance. When set, you can
          push activities to the instance and pull the web feed.
        </Text>
      </Section>

      {Platform.OS === 'android' && (
        <Section title="Auto-import (Android)">
          <Field
            label="Watch directory"
            placeholder="/sdcard/Karoo/Rides"
            value={autoPath}
            onChangeText={setAutoPath}
            autoCapitalize="none"
          />
          <Text style={styles.hint}>
            New FIT files in this directory are imported automatically in the
            background. Leave blank to disable. Requires storage permission.
          </Text>
        </Section>
      )}

      <Pressable style={styles.saveButton} onPress={save}>
        <Text style={styles.saveButtonText}>
          {saved ? '✓ Saved' : 'Save'}
        </Text>
      </Pressable>

      <Section title="About">
        <Row label="Version" value="0.1.0 (Phase 0)" />
        <Row label="Schema" value="BAS 1.0" />
        <Row label="Extraction" value="Pyodide (Phase 1)" />
      </Section>
    </ScrollView>
  );
}

function Section({ title, children }: { title: string; children: React.ReactNode }) {
  return (
    <View style={styles.section}>
      <Text style={styles.sectionTitle}>{title}</Text>
      <View style={styles.sectionBody}>{children}</View>
    </View>
  );
}

function Field({
  label, placeholder, value, onChangeText, ...rest
}: {
  label: string;
  placeholder: string;
  value: string;
  onChangeText: (v: string) => void;
  [key: string]: unknown;
}) {
  return (
    <View style={styles.field}>
      <Text style={styles.fieldLabel}>{label}</Text>
      <TextInput
        style={styles.input}
        placeholder={placeholder}
        placeholderTextColor="#52525b"
        value={value}
        onChangeText={onChangeText}
        {...rest}
      />
    </View>
  );
}

function Row({ label, value }: { label: string; value: string }) {
  return (
    <View style={styles.row}>
      <Text style={styles.rowLabel}>{label}</Text>
      <Text style={styles.rowValue}>{value}</Text>
    </View>
  );
}

const styles = StyleSheet.create({
  container: { flex: 1, backgroundColor: '#09090b' },
  content: { padding: 16, paddingTop: 60, paddingBottom: 40 },
  header: { color: '#fff', fontSize: 22, fontWeight: '700', marginBottom: 24 },
  section: { marginBottom: 28 },
  sectionTitle: {
    color: '#a1a1aa', fontSize: 11, fontWeight: '600',
    letterSpacing: 0.8, marginBottom: 8,
  },
  sectionBody: {
    backgroundColor: '#18181b', borderRadius: 10,
    borderWidth: 1, borderColor: '#27272a', overflow: 'hidden',
  },
  field: { padding: 14, borderBottomWidth: 1, borderBottomColor: '#27272a' },
  fieldLabel: { color: '#71717a', fontSize: 11, marginBottom: 4 },
  input: { color: '#f4f4f5', fontSize: 15 },
  hint: { color: '#52525b', fontSize: 12, lineHeight: 16, padding: 12 },
  row: {
    flexDirection: 'row', justifyContent: 'space-between',
    paddingHorizontal: 14, paddingVertical: 12,
    borderBottomWidth: 1, borderBottomColor: '#27272a',
  },
  rowLabel: { color: '#a1a1aa', fontSize: 14 },
  rowValue: { color: '#71717a', fontSize: 14 },
  saveButton: {
    backgroundColor: '#2563eb', borderRadius: 10,
    paddingVertical: 14, alignItems: 'center', marginBottom: 28,
  },
  saveButtonText: { color: '#fff', fontWeight: '600', fontSize: 16 },
});