import React, { useState } from "react";
import {
  View,
  Text,
  TextInput,
  StyleSheet,
  TouchableOpacity,
  KeyboardAvoidingView,
  Platform,
  Keyboard,
  TouchableWithoutFeedback,
} from "react-native";
import { useDispatch, useSelector } from "react-redux";
import { RootState } from "@/store";
import { Formik } from "formik";
import * as Yup from "yup";
import api from "@/services/axiosClient";
import { BASE_URL } from "@/constants/config";
import { setUserData } from "@/store/userSlice";
import { useSafeAreaInsets } from "react-native-safe-area-context";
import { router } from "expo-router";
import { useSnackbar } from "@/contexts/Snackbar";
import Header from "@/components/common/Header";
import { useTranslation } from "react-i18next";
import { Overlay } from "@/components/common/Overlay";

export default function EditName() {
  const { data } = useSelector((state: RootState) => state.user);
  const [isLoading, setIsLoading] = useState<boolean>();
  const originalName = data?.name || "";
  const dispatch = useDispatch();
  const insets = useSafeAreaInsets();
  const nameSchema = Yup.object().shape({
    name: Yup.string()
      .required("Name is required")
      .max(57, "Name cannot exceed 57 characters"),
  });
  const { showSnackbar } = useSnackbar();

  const { t } = useTranslation();
  const handleSave = async (values: { name: string }) => {
    try {
      setIsLoading(true);
      await api.put(`${BASE_URL}/api/v1/update-user-information`, {
        name: values.name,
        mobile: data?.mobile,
      });

      dispatch(setUserData({ name: values.name }));
      showSnackbar(`${t("profile.name-changed")}`, "success");
      router.back();
    } catch (error) {
      showSnackbar(`${t("common.something-went-wrong")}`, "error");
      console.error("Error updating name:", error);
    } finally {
      setIsLoading(false);
    }
  };

  return (
    <>
      <Header title={t("profile.edit-name")} showBackButton={true} />
      <KeyboardAvoidingView
        style={styles.container}
        behavior={Platform.OS === "ios" ? "padding" : "height"}
      >
        <TouchableWithoutFeedback onPress={Keyboard.dismiss}>
          <View style={styles.inner}>
            <Formik
              initialValues={{ name: originalName }}
              validationSchema={nameSchema}
              onSubmit={handleSave}
              enableReinitialize
            >
              {({
                handleChange,
                handleBlur,
                handleSubmit,
                values,
                touched,
                errors,
              }) => {
                const hasChanged = values.name !== originalName;
                const hasError = !!errors.name;

                return (
                  <View style={styles.formContainer}>
                    <View style={styles.inputContainer}>
                      <Text style={styles.label}>
                        {t("profile.enter-name")}
                      </Text>
                      <TextInput
                        style={[
                          styles.input,
                          {
                            borderColor:
                              touched.name && errors.name
                                ? "#D51D10"
                                : "#D8DDE7",
                          },
                        ]}
                        value={values.name}
                        onChangeText={handleChange("name")}
                        onBlur={handleBlur("name")}
                        placeholder="Enter your name"
                        placeholderTextColor="#949CAC"
                      />
                      {touched.name && errors.name && (
                        <Text style={styles.error}>{errors.name}</Text>
                      )}
                    </View>

                    <TouchableOpacity
                      onPress={handleSubmit as unknown as () => void}
                      style={[
                        styles.button,
                        hasChanged && !hasError
                          ? styles.buttonEnabled
                          : styles.buttonDisabled,
                        { marginBottom: insets.bottom },
                      ]}
                      disabled={!hasChanged || hasError}
                    >
                      <Text style={styles.buttonText}>{t("profile.save")}</Text>
                    </TouchableOpacity>
                  </View>
                );
              }}
            </Formik>
          </View>
        </TouchableWithoutFeedback>
      </KeyboardAvoidingView>
      <Overlay isUploading={isLoading ?? false} />
    </>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: "#F3F5F8",
    paddingHorizontal: 16,
  },
  inner: {
    flex: 1,
    justifyContent: "space-between",
    backgroundColor: "#F3F5F8",
  },
  formContainer: {
    flex: 1,
  },
  inputContainer: {
    marginBottom: 24,
  },
  label: {
    fontSize: 14,
    marginBottom: 8,
    color: "#252A34",
    fontFamily: "Inter",
    lineHeight: 20,
  },
  input: {
    backgroundColor: "#ffffff",
    borderRadius: 4,
    borderWidth: 1,
    height: 40,
    paddingHorizontal: 8,
    fontSize: 14,
    fontFamily: "Inter",
    fontWeight: "500",
    lineHeight: 20,
  },
  error: {
    marginTop: 8,
    color: "#D51D10",
    fontSize: 12,
    fontFamily: "Inter",
    fontWeight: "bold",
    lineHeight: 20,
  },
  button: {
    height: 48,
    borderRadius: 4,
    alignItems: "center",
    justifyContent: "center",
    width: "100%",
    paddingHorizontal: 16,
  },
  buttonEnabled: {
    backgroundColor: "#008761",
  },
  buttonDisabled: {
    backgroundColor: "#B0B7C5", // from Figma: rgba(176, 183, 197)
  },
  buttonText: {
    color: "#FCFCFC",
    fontSize: 14,
    fontFamily: "Inter",
    fontWeight: "bold",
    lineHeight: 20,
  },
});