import { useEffect, useState } from "react";
import {
  Modal,
  Pressable,
  StyleSheet,
  Text,
  TextInput,
  View,
} from "react-native";

import { Button } from "@/components/ui/Button";
import { fonts, spacing } from "@/constants/theme";
import { useAppTheme } from "@/contexts/ThemeContext";
import { isValidPin } from "@/lib/app-lock";

type PinPromptProps = {
  visible: boolean;
  title: string;
  message: string;
  confirmLabel?: string;
  requireConfirmation?: boolean;
  onCancel: () => void;
  onSubmit: (pin: string) => void;
};

export function PinPrompt({
  visible,
  title,
  message,
  confirmLabel = "Continue",
  requireConfirmation = false,
  onCancel,
  onSubmit,
}: PinPromptProps) {
  const { colors } = useAppTheme();
  const [pin, setPin] = useState("");
  const [confirmPin, setConfirmPin] = useState("");
  const [error, setError] = useState("");

  useEffect(() => {
    if (!visible) {
      setPin("");
      setConfirmPin("");
      setError("");
    }
  }, [visible]);

  function handleSubmit() {
    if (!isValidPin(pin)) {
      setError("PIN must be 4–6 digits");
      return;
    }
    if (requireConfirmation && pin !== confirmPin) {
      setError("PINs do not match");
      return;
    }
    onSubmit(pin);
  }

  return (
    <Modal visible={visible} transparent animationType="fade" onRequestClose={onCancel}>
      <Pressable style={styles.backdrop} onPress={onCancel}>
        <Pressable
          style={[styles.sheet, { backgroundColor: colors.card, borderColor: colors.border }]}
          onPress={(event) => event.stopPropagation()}
        >
          <Text style={[styles.title, { color: colors.foreground }]}>{title}</Text>
          <Text style={[styles.message, { color: colors.mutedForeground }]}>{message}</Text>

          <TextInput
            value={pin}
            onChangeText={(value) => {
              setError("");
              setPin(value.replace(/\D/g, "").slice(0, 6));
            }}
            keyboardType="number-pad"
            secureTextEntry
            maxLength={6}
            placeholder="PIN"
            placeholderTextColor={colors.mutedForeground}
            style={[
              styles.input,
              { color: colors.foreground, borderColor: colors.border, backgroundColor: colors.background },
            ]}
          />

          {requireConfirmation ? (
            <TextInput
              value={confirmPin}
              onChangeText={(value) => {
                setError("");
                setConfirmPin(value.replace(/\D/g, "").slice(0, 6));
              }}
              keyboardType="number-pad"
              secureTextEntry
              maxLength={6}
              placeholder="Confirm PIN"
              placeholderTextColor={colors.mutedForeground}
              style={[
                styles.input,
                { color: colors.foreground, borderColor: colors.border, backgroundColor: colors.background },
              ]}
            />
          ) : null}

          {error ? <Text style={[styles.error, { color: colors.destructive }]}>{error}</Text> : null}

          <View style={styles.actions}>
            <Button title="Cancel" variant="secondary" onPress={onCancel} />
            <Button title={confirmLabel} onPress={handleSubmit} />
          </View>
        </Pressable>
      </Pressable>
    </Modal>
  );
}

const styles = StyleSheet.create({
  backdrop: {
    flex: 1,
    justifyContent: "center",
    padding: spacing.lg,
    backgroundColor: "rgba(0,0,0,0.35)",
  },
  sheet: {
    borderWidth: 1,
    borderRadius: 16,
    padding: spacing.lg,
    gap: spacing.md,
  },
  title: {
    fontSize: 18,
    fontFamily: fonts.bodySemiBold,
  },
  message: {
    fontSize: 14,
    fontFamily: fonts.body,
    lineHeight: 20,
  },
  input: {
    borderWidth: 1,
    borderRadius: 12,
    minHeight: 48,
    paddingHorizontal: spacing.md,
    fontSize: 20,
    fontFamily: fonts.bodySemiBold,
    textAlign: "center",
    letterSpacing: 6,
  },
  error: {
    fontSize: 13,
    fontFamily: fonts.bodyMedium,
  },
  actions: {
    flexDirection: "row",
    gap: spacing.sm,
  },
});