import React, { useState, useEffect } from "react";

import { Animated, Easing, Image, StyleSheet, View } from "react-native";

import { StatusBar } from "expo-status-bar";

import { Link, router } from "expo-router";

import { useThemeColor } from "@/hooks/use-theme-color";

import { Button, Input } from "@/components/ui";

import { Text } from "@/components/ui/Text";

import { AuthScreen } from "@/components/auth/AuthScreen";

import { useAuth } from "@/context/AuthContext";

import { apiClient, ApiError } from "@/lib/api";

import { useToast } from "@/context/ToastContext";

import { translateError, translateFields } from "@/lib/errors/translations";

import { registerForPushNotifications } from "@/hooks/useRegisterPushToken";

export default function LoginScreen() {

  const [email, setEmail] = useState("");

  const [password, setPassword] = useState("");

  const [errors, setErrors] = useState<{ email?: string; password?: string }>(

    {},

  );

  const [loading, setLoading] = useState(false);

  const { login, updateAuthUser } = useAuth();

  const { showToast } = useToast();

  const textColor = useThemeColor({}, "text");

  const tintColor = useThemeColor({}, "tint");

  const [spinValue] = useState(() => new Animated.Value(0));

  useEffect(() => {

    const animation = Animated.loop(

      Animated.timing(spinValue, {

        toValue: 1,

        duration: 12000, // 12s per full turn (slow)

        easing: Easing.linear,

        useNativeDriver: true,

      })

    );

    animation.start();

    return () => {

      animation.stop();

    };

  }, [spinValue]);

  const spin = spinValue.interpolate({

    inputRange: [0, 1],

    outputRange: ["0deg", "360deg"],

  });

  const validateForm = () => {

    const newErrors: { email?: string; password?: string } = {};

    if (!email) {

      newErrors.email = "Email é obrigatório";

    } else if (!/\S+@\S+\.\S+/.test(email)) {

      newErrors.email = "Por favor, use um email válido";

    }

    if (!password) {

      newErrors.password = "Senha é obrigatória";

    }

    setErrors(newErrors);

    return Object.keys(newErrors).length === 0;

  };

  const handleLogin = async () => {

    if (!validateForm()) return;

    setLoading(true);

    try {

      const response = await login(email, password);

      if (response?.user) {

        const token = await registerForPushNotifications();

        if (token) {

          const updateResponse = await apiClient.updateUser({

            id: response.user.id,

            pushToken: token,

          });

          if (updateResponse) {

            updateAuthUser(updateResponse.user);

          }

        }

      }

      router.replace("/");

    } catch (error) {

      if (error instanceof ApiError && error.fields) {

        setErrors(translateFields(error.fields));

      } else {

        showToast(translateError(error) || "Falha ao fazer login", "error");

      }

    } finally {

      setLoading(false);

    }

  };

  return (

    <>

      <StatusBar style="dark" />

      <AuthScreen

        header={

          <Animated.View

            style={[styles.logoContainer, { transform: [{ rotate: spin }] }]}

          >

            <Image

              source={require("@/assets/images/logo.png")}

              style={styles.logo}

              resizeMode="contain"

            />

          </Animated.View>

        }

        title="Bem vindo de volta"

        titleTestID="text-welcome"

        subtitle="Logue na sua conta nexo"

        footer={

          <View style={styles.footer}>

            <Text style={[styles.footerText, { color: textColor, opacity: 0.7 }]}>

              Não tem uma conta ainda?{" "}

            </Text>

            <Link

              href="/auth/signup"

              asChild

              style={StyleSheet.flatten([styles.link, { color: tintColor }])}

            >

              <Text

                style={StyleSheet.flatten([

                  styles.footerText,

                  { color: tintColor },

                ])}

              >

                Cadastre-se

              </Text>

            </Link>

          </View>

        }

      >

        <View style={styles.form}>

          <Input

            label="Email"

            type="email"

            value={email}

            onChangeText={setEmail}

            placeholder="Qual seu email?"

            error={errors.email}

            autoCapitalize="none"

          />

          <Input

            label="Senha"

            type="password"

            value={password}

            onChangeText={setPassword}

            placeholder="Qual sua senha?"

            error={errors.password}

            showPasswordToggle

            testID="input-password"

          />

          <Button

            title="Entrar"

            onPress={handleLogin}

            loading={loading}

            style={styles.loginButton}

            testID="button-login"

          />

          <Link

            href="/auth/forgot-password"

            style={StyleSheet.flatten([styles.link, { color: tintColor }])}

            asChild

          >

            <Text

              style={StyleSheet.flatten([

                styles.footerText,

                { color: textColor, opacity: 0.7 },

              ])}

            >

              Esqueceu a senha?

            </Text>

          </Link>

        </View>

      </AuthScreen>

    </>

  );

}

const styles = StyleSheet.create({

  logoContainer: {

    alignItems: "center",

    marginBottom: 40,

    marginTop: 10,

  },

  logo: {

    width: 120,

    height: 120,

  },

  form: {

    marginBottom: 32,

  },

  loginButton: {

    marginTop: 8,

    marginBottom: 16,

  },

  link: {

    textAlign: "center",

    fontSize: 14,

    fontWeight: "500",

  },

  footer: {

    flexDirection: "row",

    justifyContent: "center",

    alignItems: "center",

  },

  footerText: {

    fontSize: 14,

  },

});