import { router } from "expo-router";
import { useEffect, useState } from "react";
import {
  Alert,
  KeyboardAvoidingView,
  Platform,
  Pressable,
  ScrollView,
  StyleSheet,
  Text,
  TextInput,
  View,
} from "react-native";
import { SafeAreaView } from "react-native-safe-area-context";
import {
  loadRecorderSettings,
  saveRecorderSettings,
} from "@/lib/recorder-settings";

export default function SettingsScreen() {
  const [backendUrl, setBackendUrl] = useState("");
  const [authToken, setAuthToken] = useState("");
  const [fieldName, setFieldName] = useState("file");

  useEffect(() => {
    let isMounted = true;

    async function loadSettings() {
      try {
        const settings = await loadRecorderSettings();

        if (!isMounted) {
          return;
        }

        setBackendUrl(settings.backendUrl);
        setAuthToken(settings.authToken);
        setFieldName(settings.fieldName);
      } catch {
        if (isMounted) {
          Alert.alert("Settings error", "Could not load backend settings.");
        }
      }
    }

    void loadSettings();

    return () => {
      isMounted = false;
    };
  }, []);

  async function handleSave() {
    try {
      await saveRecorderSettings({
        authToken,
        backendUrl,
        fieldName,
      });
      router.back();
    } catch {
      Alert.alert("Save failed", "Could not save backend settings.");
    }
  }

  return (
    <SafeAreaView style={styles.safeArea}>
      <KeyboardAvoidingView
        style={styles.keyboardAvoidingView}
        behavior={Platform.OS === "ios" ? "padding" : undefined}
      >
        <ScrollView
          style={styles.scrollView}
          contentContainerStyle={styles.content}
          keyboardShouldPersistTaps="handled"
        >
          <View style={styles.headerRow}>
            <Pressable onPress={() => router.back()} style={styles.navButton}>
              <Text style={styles.navButtonText}>Back</Text>
            </Pressable>
            <Text style={styles.title}>Settings</Text>
            <Pressable onPress={handleSave} style={styles.navButton}>
              <Text style={styles.navButtonText}>Save</Text>
            </Pressable>
          </View>

          <View style={styles.panel}>
            <Text style={styles.label}>Backend URL</Text>
            <TextInput
              autoCapitalize="none"
              autoCorrect={false}
              keyboardType="url"
              onChangeText={setBackendUrl}
              placeholder="https://api.example.com/upload"
              placeholderTextColor="#8f8a7c"
              style={styles.input}
              value={backendUrl}
            />

            <Text style={styles.label}>Bearer token</Text>
            <TextInput
              autoCapitalize="none"
              autoCorrect={false}
              onChangeText={setAuthToken}
              placeholder="Optional"
              placeholderTextColor="#8f8a7c"
              secureTextEntry
              style={styles.input}
              value={authToken}
            />

            <Text style={styles.label}>Form field name</Text>
            <TextInput
              autoCapitalize="none"
              autoCorrect={false}
              onChangeText={setFieldName}
              placeholder="file"
              placeholderTextColor="#8f8a7c"
              style={styles.input}
              value={fieldName}
            />

            <Text style={styles.helperText}>
              The recording is uploaded as multipart field `{fieldName.trim() || "file"}`.
            </Text>
          </View>
        </ScrollView>
      </KeyboardAvoidingView>
    </SafeAreaView>
  );
}

const styles = StyleSheet.create({
  safeArea: {
    flex: 1,
    backgroundColor: "#f4efe4",
  },
  keyboardAvoidingView: {
    flex: 1,
  },
  scrollView: {
    flex: 1,
  },
  content: {
    gap: 18,
    paddingHorizontal: 20,
    paddingBottom: 32,
    paddingTop: 8,
  },
  headerRow: {
    alignItems: "center",
    flexDirection: "row",
    justifyContent: "space-between",
  },
  navButton: {
    borderColor: "#cdbfa8",
    borderRadius: 999,
    borderWidth: 1,
    paddingHorizontal: 12,
    paddingVertical: 8,
  },
  navButtonText: {
    color: "#13304a",
    fontSize: 14,
    fontWeight: "700",
  },
  title: {
    color: "#13304a",
    fontSize: 28,
    fontWeight: "800",
  },
  panel: {
    backgroundColor: "#fffaf1",
    borderColor: "#dccfb9",
    borderRadius: 24,
    borderWidth: 1,
    gap: 12,
    padding: 18,
  },
  label: {
    color: "#13304a",
    fontSize: 13,
    fontWeight: "700",
    marginBottom: -4,
    textTransform: "uppercase",
  },
  input: {
    backgroundColor: "#f7f0e0",
    borderColor: "#d9ccb5",
    borderRadius: 16,
    borderWidth: 1,
    color: "#1a2b39",
    fontSize: 16,
    paddingHorizontal: 14,
    paddingVertical: 14,
  },
  helperText: {
    color: "#665f54",
    fontSize: 13,
    lineHeight: 18,
  },
});