import { Images } from "@/constants/images";
import { getUserInfo, realNameAuth, UserInfo } from "@/services/user";
import { useFocusEffect, useRouter } from "expo-router";
import React, { useCallback, useState } from "react";
import {
  Alert,
  ImageBackground,
  KeyboardAvoidingView,
  Platform,
  ScrollView,
  StatusBar,
  StyleSheet,
  Text,
  TextInput,
  TouchableOpacity,
  View,
} from "react-native";
import { useSafeAreaInsets } from "react-native-safe-area-context";

const NAME_REG = /^[\u4e00-\u9fa5]{2,10}$/;
const ID_REG = /(^\d{15}$)|(^\d{18}$)|(^\d{17}(\d|X|x)$)/;

const maskName = (name: string) => {
  if (!name) return "";
  if (name.length <= 1) return name;
  return name[0] + "*".repeat(name.length - 1);
};

const maskIdNum = (id: string) => {
  if (!id) return "";
  if (id.length <= 8) return id;
  return id.slice(0, 3) + "*".repeat(id.length - 7) + id.slice(-4);
};

export default function CertificationScreen() {
  const router = useRouter();
  const insets = useSafeAreaInsets();
  const [user, setUser] = useState<UserInfo | null>(null);
  const [idName, setIdName] = useState("");
  const [idNum, setIdNum] = useState("");
  const [loading, setLoading] = useState(false);
  const [submitting, setSubmitting] = useState(false);

  const loadUser = useCallback(async () => {
    setLoading(true);
    try {
      const info = await getUserInfo();
      setUser(info);
    } catch (e) {
      console.error("获取用户信息失败:", e);
    } finally {
      setLoading(false);
    }
  }, []);

  useFocusEffect(
    useCallback(() => {
      loadUser();
    }, [loadUser]),
  );

  const isVerified = user?.realNameFlag === 1;

  const handleBack = () => router.back();

  const handleSubmit = async () => {
    const trimName = idName.trim();
    const trimId = idNum.trim();

    if (!trimName) {
      Alert.alert("提示", "请输入真实姓名");
      return;
    }
    if (!NAME_REG.test(trimName)) {
      Alert.alert("提示", "请输入正确的姓名格式（2-10个中文字符）");
      return;
    }
    if (!trimId) {
      Alert.alert("提示", "请输入身份证号");
      return;
    }
    if (!ID_REG.test(trimId)) {
      Alert.alert("提示", "请输入正确的身份证号码");
      return;
    }

    try {
      setSubmitting(true);
      const ok = await realNameAuth(trimName, trimId);
      if (ok) {
        Alert.alert("提示", "提交成功", [
          { text: "确定", onPress: () => router.back() },
        ]);
      }
    } catch (e) {
      console.error("提交实名认证失败:", e);
    } finally {
      setSubmitting(false);
    }
  };

  return (
    <ImageBackground
      source={{ uri: Images.mine.kaixinMineBg }}
      style={styles.container}
      resizeMode="cover"
    >
      <StatusBar barStyle="light-content" />

      <View style={[styles.header, { paddingTop: insets.top }]}>
        <TouchableOpacity style={styles.backBtn} onPress={handleBack}>
          <Text style={styles.backIcon}>‹</Text>
        </TouchableOpacity>
        <Text style={styles.headerTitle}>实名认证</Text>
        <View style={styles.placeholder} />
      </View>

      <KeyboardAvoidingView
        style={{ flex: 1 }}
        behavior={Platform.OS === "ios" ? "padding" : undefined}
      >
        <ScrollView
          style={styles.scrollView}
          showsVerticalScrollIndicator={false}
          keyboardShouldPersistTaps="handled"
        >
          <View style={styles.content}>
            <View style={styles.card}>
              {loading ? (
                <Text style={styles.loadingText}>加载中...</Text>
              ) : isVerified ? (
                <>
                  <View style={styles.verifiedBanner}>
                    <Text style={styles.verifiedBannerText}>✓ 已完成实名认证</Text>
                  </View>

                  <View style={styles.formItem}>
                    <Text style={styles.label}>真实姓名</Text>
                    <View style={styles.readonly}>
                      <Text style={styles.readonlyText}>
                        {maskName(user?.idName || "")}
                      </Text>
                    </View>
                  </View>

                  <View style={styles.formItem}>
                    <Text style={styles.label}>身份证号</Text>
                    <View style={styles.readonly}>
                      <Text style={styles.readonlyText}>
                        {maskIdNum(user?.idNum || "")}
                      </Text>
                    </View>
                  </View>

                  <View style={styles.tips}>
                    <Text style={styles.tipsIcon}>ⓘ</Text>
                    <Text style={styles.tipsText}>
                      实名信息已提交，不可修改
                    </Text>
                  </View>
                </>
              ) : (
                <>
                  <View style={styles.formItem}>
                    <Text style={styles.label}>真实姓名</Text>
                    <TextInput
                      style={styles.input}
                      value={idName}
                      onChangeText={setIdName}
                      placeholder="请输入您的真实姓名"
                      placeholderTextColor="#bbb"
                      maxLength={20}
                    />
                  </View>

                  <View style={styles.formItem}>
                    <Text style={styles.label}>身份证号</Text>
                    <TextInput
                      style={styles.input}
                      value={idNum}
                      onChangeText={setIdNum}
                      placeholder="请输入您的身份证号码"
                      placeholderTextColor="#bbb"
                      maxLength={18}
                      autoCapitalize="characters"
                    />
                  </View>

                  <View style={styles.tips}>
                    <Text style={styles.tipsIcon}>⚠️</Text>
                    <Text style={styles.tipsText}>
                      请确保您填写的信息真实有效，提交后将无法修改
                    </Text>
                  </View>

                  <TouchableOpacity
                    style={[styles.submitBtn, submitting && styles.submitBtnDisabled]}
                    onPress={handleSubmit}
                    disabled={submitting}
                    activeOpacity={0.8}
                  >
                    <Text style={styles.submitBtnText}>
                      {submitting ? "提交中..." : "提交"}
                    </Text>
                  </TouchableOpacity>
                </>
              )}
            </View>
          </View>
        </ScrollView>
      </KeyboardAvoidingView>
    </ImageBackground>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
  },
  header: {
    flexDirection: "row",
    alignItems: "center",
    justifyContent: "space-between",
    paddingHorizontal: 10,
    height: 80,
  },
  backBtn: {
    width: 40,
    height: 40,
    justifyContent: "center",
    alignItems: "center",
  },
  backIcon: {
    fontSize: 32,
    color: "#fff",
    fontWeight: "bold",
  },
  headerTitle: {
    fontSize: 16,
    fontWeight: "bold",
    color: "#fff",
  },
  placeholder: {
    width: 40,
  },
  scrollView: {
    flex: 1,
  },
  content: {
    paddingHorizontal: 15,
    paddingTop: 10,
    paddingBottom: 30,
  },
  card: {
    backgroundColor: "#fff",
    borderRadius: 15,
    padding: 20,
  },
  loadingText: {
    textAlign: "center",
    color: "#999",
    paddingVertical: 40,
  },
  verifiedBanner: {
    backgroundColor: "#e6f9ef",
    borderRadius: 8,
    paddingVertical: 10,
    paddingHorizontal: 14,
    marginBottom: 20,
    alignItems: "center",
  },
  verifiedBannerText: {
    color: "#1aad5a",
    fontSize: 14,
    fontWeight: "600",
  },
  formItem: {
    marginBottom: 20,
  },
  label: {
    fontSize: 14,
    color: "#333",
    fontWeight: "500",
    marginBottom: 10,
  },
  input: {
    width: "100%",
    height: 40,
    paddingHorizontal: 10,
    borderWidth: 1,
    borderColor: "#e5e5e5",
    borderRadius: 5,
    fontSize: 14,
    color: "#333",
    backgroundColor: "#f8f8f8",
  },
  readonly: {
    width: "100%",
    height: 40,
    paddingHorizontal: 10,
    borderWidth: 1,
    borderColor: "#e5e5e5",
    borderRadius: 5,
    backgroundColor: "#f5f5f5",
    justifyContent: "center",
  },
  readonlyText: {
    fontSize: 14,
    color: "#666",
    letterSpacing: 1,
  },
  tips: {
    flexDirection: "row",
    alignItems: "flex-start",
    padding: 10,
    marginBottom: 20,
    backgroundColor: "#fff9e6",
    borderRadius: 5,
    borderLeftWidth: 2,
    borderLeftColor: "#ffdd02",
  },
  tipsIcon: {
    fontSize: 14,
    marginRight: 6,
  },
  tipsText: {
    flex: 1,
    fontSize: 12,
    color: "#ff9900",
    lineHeight: 18,
  },
  submitBtn: {
    backgroundColor: "#FC7D2E",
    borderRadius: 8,
    paddingVertical: 13,
    alignItems: "center",
  },
  submitBtnDisabled: {
    opacity: 0.6,
  },
  submitBtnText: {
    color: "#fff",
    fontSize: 16,
    fontWeight: "600",
  },
});