import { ThemedText } from "@/components/themed-text";
import { ThemedView } from "@/components/themed-view";
import { showToastError } from "@/config";
import { TOKEN } from "@/constants";
import { login } from "@/controller/AuthController";
import {
  getStorageItem,
  removeStorageItem,
  setStorageItem,
} from "@/utils/storage";
import { parseJwtToken } from "@/utils/token";
import { useRouter } from "expo-router";
import React, { useCallback, useEffect, useState } from "react";
import {
  ActivityIndicator,
  KeyboardAvoidingView,
  Platform,
  ScrollView,
  StyleSheet,
  Text,
  TextInput,
  TouchableOpacity,
  View,
} from "react-native";

export default function LoginScreen() {
  const router = useRouter();
  const [username, setUsername] = useState("");
  const [password, setPassword] = useState("");
  const [loading, setLoading] = useState(false);

  const checkLogin = useCallback(async () => {
    const token = await getStorageItem(TOKEN);
    if (!token) {
      return;
    }
    const parsed = parseJwtToken(token);
    console.log("Parse Token: ", parsed);

    const { exp } = parsed;
    const now = Math.floor(Date.now() / 1000);
    const oneHour = 60 * 60;
    if (exp - now < oneHour) {
      await removeStorageItem(TOKEN);
    } else {
      router.replace("/(tabs)");
    }
  }, [router]);

  useEffect(() => {
    checkLogin();
  }, [checkLogin]);

  const handleLogin = async () => {
    // Validate input
    if (!username.trim() || !password.trim()) {
      showToastError("Lỗi", "Vui lòng nhập tài khoản và mật khẩu");
      return;
    }

    setLoading(true);
    try {
      const body: Model.LoginRequestBody = {
        username: username,
        password: password,
      };

      const response = await login(body);

      // Nếu thành công, lưu token và chuyển sang (tabs)
      console.log("Login thành công với data:", response.data);
      if (response?.data.token) {
        // Lưu token vào storage nếu cần (thêm logic này sau)
        await setStorageItem(TOKEN, response.data.token);
        console.log("Token:", response.data.token);
        router.replace("/(tabs)");
      }
    } catch (error) {
      showToastError(
        "Lỗi",
        error instanceof Error ? error.message : "Đăng nhập thất bại"
      );
    } finally {
      setLoading(false);
    }
  };

  return (
    <KeyboardAvoidingView
      behavior={Platform.OS === "ios" ? "padding" : "height"}
      style={{ flex: 1 }}
    >
      <ScrollView contentContainerStyle={styles.scrollContainer}>
        <ThemedView style={styles.container}>
          {/* Header */}
          <View style={styles.headerContainer}>
            <ThemedText type="title" style={styles.title}>
              SGW App
            </ThemedText>
            <ThemedText style={styles.subtitle}>
              Đăng nhập để tiếp tục
            </ThemedText>
          </View>

          {/* Form */}
          <View style={styles.formContainer}>
            {/* Username Input */}
            <View style={styles.inputGroup}>
              <ThemedText style={styles.label}>Tài khoản</ThemedText>
              <TextInput
                style={styles.input}
                placeholder="Nhập tài khoản"
                placeholderTextColor="#999"
                value={username}
                onChangeText={setUsername}
                editable={!loading}
                autoCapitalize="none"
              />
            </View>

            {/* Password Input */}
            <View style={styles.inputGroup}>
              <ThemedText style={styles.label}>Mật khẩu</ThemedText>
              <TextInput
                style={styles.input}
                placeholder="Nhập mật khẩu"
                placeholderTextColor="#999"
                value={password}
                onChangeText={setPassword}
                secureTextEntry
                editable={!loading}
                autoCapitalize="none"
              />
            </View>

            {/* Login Button */}
            <TouchableOpacity
              style={[
                styles.loginButton,
                loading && styles.loginButtonDisabled,
              ]}
              onPress={handleLogin}
              disabled={loading}
            >
              {loading ? (
                <ActivityIndicator color="#fff" size="small" />
              ) : (
                <Text style={styles.loginButtonText}>Đăng nhập</Text>
              )}
            </TouchableOpacity>

            {/* Footer text */}
            <View style={styles.footerContainer}>
              <ThemedText style={styles.footerText}>
                Chưa có tài khoản?{" "}
                <Text style={styles.linkText}>Đăng ký ngay</Text>
              </ThemedText>
            </View>
          </View>
        </ThemedView>
      </ScrollView>
    </KeyboardAvoidingView>
  );
}

const styles = StyleSheet.create({
  scrollContainer: {
    flexGrow: 1,
    justifyContent: "center",
  },
  container: {
    flex: 1,
    paddingHorizontal: 20,
    justifyContent: "center",
  },
  headerContainer: {
    marginBottom: 40,
    alignItems: "center",
  },
  title: {
    fontSize: 32,
    fontWeight: "bold",
    marginBottom: 8,
  },
  subtitle: {
    fontSize: 16,
    opacity: 0.7,
  },
  formContainer: {
    gap: 16,
  },
  inputGroup: {
    gap: 8,
  },
  label: {
    fontSize: 14,
    fontWeight: "600",
  },
  input: {
    borderWidth: 1,
    borderColor: "#ddd",
    borderRadius: 8,
    paddingHorizontal: 12,
    paddingVertical: 12,
    fontSize: 16,
    backgroundColor: "#f5f5f5",
    color: "#000",
  },
  loginButton: {
    backgroundColor: "#007AFF",
    paddingVertical: 14,
    borderRadius: 8,
    alignItems: "center",
    marginTop: 16,
  },
  loginButtonDisabled: {
    opacity: 0.6,
  },
  loginButtonText: {
    color: "#fff",
    fontSize: 16,
    fontWeight: "600",
  },
  footerContainer: {
    marginTop: 16,
    alignItems: "center",
  },
  footerText: {
    fontSize: 14,
  },
  linkText: {
    color: "#007AFF",
    fontWeight: "600",
  },
});