import { useState } from "react";
import {
  View,
  Text,
  KeyboardAvoidingView,
  Platform,
  ScrollView,
  Alert,
  Pressable,
} from "react-native";
import { useRouter } from "expo-router";
import { useMutation, useAction } from "convex/react";
import { api } from "../../convex/_generated/api";
import { Input } from "../../components/ui/input";
import { Button } from "../../components/ui/button";
import { useTheme } from "../../components/theme";
import { useAuth } from "../_layout";

type Role = "handyman" | "customer";

export default function RegisterScreen() {
  const theme = useTheme();
  const router = useRouter();
  const { login } = useAuth();
  const registerMutation = useMutation(api.auth.register);
  const hashPassword = useAction(api.auth.hashPassword);

  const [name, setName] = useState("");
  const [email, setEmail] = useState("");
  const [phone, setPhone] = useState("");
  const [password, setPassword] = useState("");
  const [role, setRole] = useState<Role>("customer");
  const [loading, setLoading] = useState(false);

  async function handleRegister() {
    if (!name || !email || !password) {
      Alert.alert("Грешка", "Пополнете ги сите задолжителни полиња");
      return;
    }
    if (password.length < 8) {
      Alert.alert("Грешка", "Лозинката мора да има најмалку 8 карактери");
      return;
    }

    setLoading(true);
    try {
      const passwordHash = await hashPassword({ password });
      const result = await registerMutation({
        name,
        email,
        passwordHash,
        role,
        phone: phone || undefined,
      });
      await login(result.token, result.user!._id);
      router.replace("/(tabs)/(home)");
    } catch (e: any) {
      Alert.alert("Регистрација неуспешна", e.message || "Обидете се повторно");
    } finally {
      setLoading(false);
    }
  }

  return (
    <KeyboardAvoidingView
      behavior={Platform.OS === "ios" ? "padding" : "height"}
      style={{ flex: 1, backgroundColor: theme.colors.background }}
    >
      <ScrollView
        contentInsetAdjustmentBehavior="automatic"
        contentContainerStyle={{ padding: theme.spacing.lg, gap: theme.spacing.md }}
        keyboardShouldPersistTaps="handled"
      >
        <View style={{ marginTop: 40, marginBottom: theme.spacing.md }}>
          <Text style={{ fontSize: 28, fontWeight: "700", color: theme.colors.text }}>
            Креирајте профил
          </Text>
          <Text style={{ fontSize: 16, color: theme.colors.textSecondary, marginTop: theme.spacing.sm }}>
            Изберете ја вашата улога
          </Text>
        </View>

        <View style={{ flexDirection: "row", gap: theme.spacing.md }}>
          <Pressable
            onPress={() => setRole("customer")}
            style={{
              flex: 1,
              paddingVertical: theme.spacing.md,
              paddingHorizontal: theme.spacing.sm,
              borderRadius: theme.radius.md,
              borderWidth: 2,
              borderColor: role === "customer" ? theme.colors.primary : theme.colors.border,
              backgroundColor: role === "customer" ? theme.colors.primaryLight : theme.colors.surface,
              alignItems: "center",
              gap: theme.spacing.sm,
            }}
          >
            <Text style={{ fontSize: 32 }}>🏠</Text>
            <Text style={{ fontWeight: "600", color: theme.colors.text }}>Клиент</Text>
            <Text style={{ fontSize: 12, color: theme.colors.textSecondary, textAlign: "center" }}>
              Барајте мајстори
            </Text>
          </Pressable>

          <Pressable
            onPress={() => setRole("handyman")}
            style={{
              flex: 1,
              paddingVertical: theme.spacing.md,
              paddingHorizontal: theme.spacing.sm,
              borderRadius: theme.radius.md,
              borderWidth: 2,
              borderColor: role === "handyman" ? theme.colors.primary : theme.colors.border,
              backgroundColor: role === "handyman" ? theme.colors.primaryLight : theme.colors.surface,
              alignItems: "center",
              gap: theme.spacing.sm,
            }}
          >
            <Text style={{ fontSize: 32 }}>🔧</Text>
            <Text style={{ fontWeight: "600", color: theme.colors.text }}>Мајстор</Text>
            <Text style={{ fontSize: 12, color: theme.colors.textSecondary, textAlign: "center" }}>
              Нудете услуги
            </Text>
          </Pressable>
        </View>

        <Input placeholder="Име и презиме" value={name} onChangeText={setName} />
        <Input
          placeholder="Е-пошта"
          value={email}
          onChangeText={setEmail}
          autoCapitalize="none"
          keyboardType="email-address"
        />
        <Input
          placeholder="Телефонски број (незадолжително)"
          value={phone}
          onChangeText={setPhone}
          keyboardType="phone-pad"
        />
        <Input placeholder="Лозинка (мин. 8 карактери)" value={password} onChangeText={setPassword} secureTextEntry />

        <View style={{ marginTop: theme.spacing.sm }}>
          <Button loading={loading} onPress={handleRegister}>
            Регистрирај се
          </Button>
        </View>

        <View style={{ flexDirection: "row", justifyContent: "center", marginTop: theme.spacing.md }}>
          <Text style={{ color: theme.colors.textSecondary }}>Веќе имате профил? </Text>
          <Text style={{ color: theme.colors.primary, fontWeight: "600" }} onPress={() => router.back()}>
            Најавете се
          </Text>
        </View>
      </ScrollView>
    </KeyboardAvoidingView>
  );
}