import React, { useState } from "react";
import {
  View,
  Text,
  StyleSheet,
  ScrollView,
  TouchableOpacity,
  ToastAndroid,
} from "react-native";
import LucideIcon from '../../components/common/LucideIcon';
import { useNavigation } from "@react-navigation/native";
import { responsiveFontSize } from "react-native-responsive-dimensions";

import { CustomInput, CustomButton } from "../../components/common/Custom";
import { useTheme } from "../../hooks/ui/useTheme";
import { useCreate } from "../../hooks/core/useCreate";
import AppView from "../../components/AppView";
import FontsFamily from "../../constents/FontsFamily";
import { APPLY_ORGANIZER_URL } from "../../utils/ApiUrls";

type OrganizerApplyErrors = {
  idName?: string;
  idNumber?: string;
  issueDate?: string;
};

const isValidIdType = (value: string) => /^[A-Za-z][A-Za-z\s-]{1,}$/.test(value.trim());
const isValidIdNumber = (value: string) => /^[A-Za-z0-9-]{6,24}$/.test(value.trim());
const formatIssueDateInput = (value: string) => {
  const digits = value.replace(/\D/g, "").slice(0, 8);

  if (digits.length <= 2) return digits;
  if (digits.length <= 4) return `${digits.slice(0, 2)}-${digits.slice(2)}`;
  return `${digits.slice(0, 2)}-${digits.slice(2, 4)}-${digits.slice(4)}`;
};

const isValidIssueDate = (value: string) => {
  if (!/^\d{2}-\d{2}-\d{4}$/.test(value)) return false;
  const [day, month, year] = value.split("-").map(Number);
  const parsed = new Date(Date.UTC(year, month - 1, day));
  const isRealDate =
    parsed.getUTCFullYear() === year &&
    parsed.getUTCMonth() + 1 === month &&
    parsed.getUTCDate() === day;
  if (!isRealDate) return false;

  const today = new Date();
  const todayUtc = Date.UTC(today.getUTCFullYear(), today.getUTCMonth(), today.getUTCDate());
  return parsed.getTime() <= todayUtc;
};

const BecomeOrg = () => {
  const theme = useTheme();
  const navigation = useNavigation<any>();

  const [idName, setIdName] = useState("");
  const [idNumber, setIdNumber] = useState("");
  const [issueDate, setIssueDate] = useState("");
  const [errors, setErrors] = useState<OrganizerApplyErrors>({});

  const { mutate: applyOrganizer, isPending: loading } = useCreate<any, any>(APPLY_ORGANIZER_URL, {
    onSuccess: (res) => {
      console.log("api res",res)
      if (res.status === "success") {
        ToastAndroid.show("Application submitted successfully!", ToastAndroid.SHORT);
        navigation.navigate("Home");
      } else {
        ToastAndroid.show(res.message || "Failed to submit application", ToastAndroid.SHORT);
      }
    },
    onError: (err: any) => {
      ToastAndroid.show(err.message || "An error occurred", ToastAndroid.SHORT);
    }
  });

  const handleChange = (field: keyof OrganizerApplyErrors, value: string) => {
    if (field === "idName") setIdName(value);
    if (field === "idNumber") setIdNumber(value);
    if (field === "issueDate") setIssueDate(value);
    if (errors[field]) {
      setErrors((prev) => ({ ...prev, [field]: "" }));
    }
  };

  const validateForm = () => {
    const nextErrors: OrganizerApplyErrors = {};

    if (!isValidIdType(idName)) {
      nextErrors.idName = "Enter a valid ID type (min 2 letters).";
    }
    if (!isValidIdNumber(idNumber)) {
      nextErrors.idNumber = "ID number must be 6-24 chars (A-Z, 0-9, -).";
    }
    if (!isValidIssueDate(issueDate)) {
      nextErrors.issueDate = "Use valid date DD-MM-YYYY (not future).";
    }

    setErrors(nextErrors);
    return Object.keys(nextErrors).length === 0;
  };

  const handleSubmit = () => {
    if (!validateForm()) {
      ToastAndroid.show("Please fix the highlighted fields.", ToastAndroid.SHORT);
      return;
    }
    applyOrganizer({
      idName: idName.trim(),
      idNumber: idNumber.trim(),
      issueDate: issueDate.trim(),
    });
  };

  return (
    <AppView keyboardVerticalOffset={60} dismissKeyboardOnTap={false}>
      <View style={styles.header}>
        <TouchableOpacity onPress={() => navigation.goBack()} style={styles.backButton}>
          <LucideIcon name="arrow-back" size={24} color={theme.colors.textPrimary} />
        </TouchableOpacity>
        <Text style={[styles.headerTitle, { color: theme.colors.textPrimary }]}>Become Organizer</Text>
      </View>
      <ScrollView
        style={styles.scrollView}
        contentContainerStyle={styles.scrollContent}
        keyboardShouldPersistTaps="handled"
        keyboardDismissMode="on-drag"
        showsVerticalScrollIndicator={false}
      >
        <View style={[styles.card, { backgroundColor: theme.colors.surface, borderColor: theme.colors.border }]}>
          <Text style={[styles.title, { color: theme.colors.textPrimary }]}>ID Verification</Text>
          <Text style={[styles.subtitle, { color: theme.colors.textSecondary }]}>
            Please provide your official identification details to become a verified organizer.
          </Text>

          <CustomInput
            label="ID Type"
            placeholder="e.g., National ID"
            value={idName}
            onChangeText={(val) => handleChange("idName", val)}
            icon="person-outline"
            error={errors.idName}
          />

          <CustomInput
            label="ID Number"
            placeholder="Enter your ID number"
            value={idNumber}
            onChangeText={(val) => handleChange("idNumber", val.toUpperCase())}
            autoCapitalize="characters"
            icon="card-outline"
            error={errors.idNumber}
          />

          <CustomInput
            label="Issue Date"
            placeholder="DD-MM-YYYY"
            value={issueDate}
            onChangeText={(val) => handleChange("issueDate", formatIssueDateInput(val))}
            icon="calendar-outline"
            error={errors.issueDate}
          />

          <CustomButton
            title="Submit Application"
            onPress={handleSubmit}
            loading={loading}
            style={styles.submitBtn}
            icon="send-outline"
          />
        </View>
      </ScrollView>
    </AppView>
  );
};

const styles = StyleSheet.create({
  header: {
    flexDirection: "row",
    alignItems: "center",
    paddingHorizontal: 24,
    paddingVertical: 16,
  },
  backButton: {
    marginRight: 16,
    padding: 4,
  },
  headerTitle: {
    fontSize: responsiveFontSize(2.4),
    fontFamily: FontsFamily.nunitoBold,
  },
  scrollView: {
    flex: 1,
  },
  scrollContent: {
    flexGrow: 1,
    paddingHorizontal: 20,
    paddingTop: 10,
    justifyContent: "flex-start",
    paddingBottom: 40,
  },
  card: {
    padding: 24,
    borderRadius: 24,
    borderWidth: 1,
    elevation: 2,
    shadowColor: '#000',
    shadowOpacity: 0.04,
    shadowRadius: 12,
    shadowOffset: { width: 0, height: 4 },
  },
  title: {
    fontSize: responsiveFontSize(2.6),
    fontFamily: FontsFamily.nunitoBold,
    marginBottom: 8,
    textAlign: "center",
  },
  subtitle: {
    fontSize: responsiveFontSize(1.6),
    fontFamily: FontsFamily.nunitoRegular,
    textAlign: "center",
    marginBottom: 30,
  },
  submitBtn: {
    marginTop: 12,
  }
});

export default BecomeOrg;