import React, { useState } from "react";
import {
  View,
  Text,
  StyleSheet,
  ScrollView,
  KeyboardAvoidingView,
  Platform,
  TouchableOpacity,
  Alert,
  Image,
} from "react-native";
import { useNavigation } from "@react-navigation/native";
import { CustomInput } from "../components/common/Custom";
import CustomButton from "../components/CustomButton";
import colors from "../components/colors";
import { launchImageLibrary } from "react-native-image-picker";
import Ionicons from "@react-native-vector-icons/ionicons";
import { UPLOAD_GROUP_IMAGE } from "../utils/ApiUrls";

export default function GroupCreationForm() {
  const navigation = useNavigation<any>();
  const [form, setForm] = useState({
    groupName: "",
    description: "",
    visibility: "PRIVATE",
    withdrawalMethod: "RANDOM",
    minParticipants: "",
    maxParticipants: "",
    contributionAmount: "",
    cycleType: "MONTHLY",
    customCycleDays: "",
    lateFeeMode: "DAILY",
    lateFeeValue: "",
  });

  const [errors, setErrors] = useState<any>({});
  const [selectedImage, setSelectedImage] = useState()

  const handleChange = (key: string, value: string) => {
    setForm({ ...form, [key]: value });
    if (errors[key]) {
      setErrors({ ...errors, [key]: null });
    }
  };

  const cycleTypes = ["CUSTOM", "MONTHLY", "QUARTERLY", "YEARLY", "HALF_YEARLY"];
  const distributionTypes = ["SEQUENTIAL", "RANDOM"];
  const lateFeeModes = ["DAILY", "MONTHLY"];

  const validateForm = () => {
    const newErrors: any = {};
    if (!form.groupName.trim()) newErrors.groupName = "Group name is required.";
    if (!form.description.trim()) newErrors.description = "Description is required.";
    if (!form.minParticipants || Number(form.minParticipants) <= 0) newErrors.minParticipants = "Min participants must be at least 1.";
    if (!form.maxParticipants || Number(form.maxParticipants) < Number(form.minParticipants)) newErrors.maxParticipants = "Max must be greater than or equal to min.";
    if (!form.contributionAmount || Number(form.contributionAmount) <= 0) newErrors.contributionAmount = "Amount must be greater than 0.";
    if (form.cycleType === "CUSTOM" && (!form.customCycleDays || Number(form.customCycleDays) <= 0)) newErrors.customCycleDays = "Custom days must be greater than 0.";
    if (!form.lateFeeMode && (!form.lateFeeValue || Number(form.lateFeeValue) <= 0)) newErrors.lateFeeValue = "Late fee value is required.";
    console.log("new errors : ", newErrors)
    setErrors(newErrors);
    return Object.keys(newErrors).length === 0;
  };

  const handleReview = () => {
    if (validateForm()) {
      const payload = {
        ...form,
        contributionAmount: Number(form.contributionAmount),
        customCycleDays: Number(form.customCycleDays) || 0,
        lateFeeValue: Number(form.lateFeeValue) || 0,
        maxParticipants: Number(form.maxParticipants),
        minParticipants: Number(form.minParticipants),
      };
      console.log("Reviewing Payload:", payload);
      navigation.navigate("GroupReview", { form: payload });
    } else {
      Alert.alert("Incomplete Form", "Please fill out all required fields correctly.");
      setErrors('')
    }
  };


  return (
    <KeyboardAvoidingView
      style={{ flex: 1, backgroundColor: "#f5f6fa", paddingTop: Platform.OS === "android" ? 40 : 0 }}
      behavior={Platform.OS === "ios" ? "padding" : "height"}
    >
      <ScrollView contentContainerStyle={styles.container} showsVerticalScrollIndicator={false}>
        <View style={styles.titleContainer}><Text style={styles.title}>Create New Group</Text></View>

        <CustomInput label="Group Name" placeholder="e.g., 'Family Savings'" value={form.groupName} onChangeText={(val) => handleChange("groupName", val)} icon="people" error={errors.groupName} />
        <CustomInput label="Description" placeholder="e.g., 'Monthly fund for family needs'" value={form.description} onChangeText={(val) => handleChange("description", val)} multiline icon="document-text" error={errors.description} />

        <Section title="Group Settings">
          <SettingRow label="Visibility">
            <ToggleButtons
              options={["PRIVATE", "PUBLIC"]}
              selectedValue={form.visibility}
              onSelect={(val) => handleChange("visibility", val)}
            />
          </SettingRow>
          <SettingRow label="Fund Distribution">
            <ToggleButtons
              options={distributionTypes}
              selectedValue={form.withdrawalMethod}
              onSelect={(val) => handleChange("withdrawalMethod", val)}
            />
          </SettingRow>
        </Section>

        <Section title="Participant Rules">
          <View style={styles.participantsRow}>
            <View style={styles.participantInput}><CustomInput label="Min" placeholder="e.g., 5" value={form.minParticipants} onChangeText={(val) => handleChange("minParticipants", val)} keyboardType="numeric" icon="person-add" error={errors.minParticipants} /></View>
            <View style={styles.participantInput}><CustomInput label="Max" placeholder="e.g., 10" value={form.maxParticipants} onChangeText={(val) => handleChange("maxParticipants", val)} keyboardType="numeric" icon="people-circle" error={errors.maxParticipants} /></View>
          </View>
        </Section>

        <Section title="Financial Details">
          <CustomInput label="Contribution Amount (INR)" placeholder="e.g., 5000" value={form.contributionAmount} onChangeText={(val) => handleChange("contributionAmount", val)} keyboardType="numeric" icon="cash" error={errors.contributionAmount} />
          <SettingRow label="Payment Cycle">
            <ToggleButtons
              options={cycleTypes}
              selectedValue={form.cycleType}
              onSelect={(val) => handleChange("cycleType", val)}
              isWrap={true}
            />
          </SettingRow>
          {form.cycleType === "CUSTOM" && (<CustomInput label="Custom Cycle (Days)" placeholder="Enter number of days" value={form.customCycleDays} onChangeText={(val) => handleChange("customCycleDays", val)} keyboardType="numeric" icon="calendar" error={errors.customCycleDays} />)}
        </Section>

        <Section title="Late Fee Policy">
          <SettingRow label="Fee Mode">
            <ToggleButtons
              options={lateFeeModes}
              selectedValue={form.lateFeeMode}
              onSelect={(val) => handleChange("lateFeeMode", val)}
            />
          </SettingRow>
          <CustomInput label="Late Fee Value (INR)" placeholder="e.g., 50" value={form.lateFeeValue} onChangeText={(val) => handleChange("lateFeeValue", val)} keyboardType="numeric" icon="alert-circle" error={errors.lateFeeValue} />
        </Section>

        <CustomButton title="Review Group" onPress={handleReview} style={{ marginTop: 20 }} />
      </ScrollView>
    </KeyboardAvoidingView>
  );
}

// --- Helper Components for a cleaner layout ---

const Section: React.FC<{ title: string, children: React.ReactNode }> = ({ title, children }) => (
  <View style={styles.section}>
    <Text style={styles.sectionTitle}>{title}</Text>
    {children}
  </View>
);

const SettingRow: React.FC<{ label: string, children: React.ReactNode }> = ({ label, children }) => (
  <View style={styles.settingRow}>
    <Text style={styles.label}>{label}</Text>
    {children}
  </View>
);

const ToggleButtons: React.FC<{ options: string[], selectedValue: string, onSelect: (value: string) => void, isWrap?: boolean }> = ({ options, selectedValue, onSelect, isWrap = false }) => (
  <View style={[styles.toggleContainer, isWrap && { flexWrap: 'wrap' }]}>
    {options.map((option) => (
      <TouchableOpacity
        key={option}
        onPress={() => onSelect(option)}
        style={[styles.toggleButton, selectedValue === option && styles.selectedButton, isWrap && { flex: 0, paddingHorizontal: 15 }]}
      >
        <Text style={[styles.toggleButtonText, selectedValue === option && styles.selectedButtonText]}>
          {option.charAt(0) + option.slice(1).toLowerCase()}
        </Text>
      </TouchableOpacity>
    ))}
  </View>
);

const styles = StyleSheet.create({
  container: { flexGrow: 1, padding: 16, backgroundColor: "#f5f6fa" },
  titleContainer: { marginBottom: 20, paddingHorizontal: 4 },
  title: { fontSize: 28, fontWeight: "bold", color: "#1F2937" },

  section: {
    backgroundColor: '#fff',
    borderRadius: 12,
    padding: 16,
    marginBottom: 16,
    elevation: 1,
    shadowColor: '#4A5568',
    shadowOpacity: 0.06,
    shadowRadius: 10,
  },
  sectionTitle: {
    fontSize: 18,
    fontWeight: '600',
    color: '#374151',
    marginBottom: 16,
    borderBottomWidth: 1,
    borderBottomColor: '#F3F4F6',
    paddingBottom: 10,
  },

  avatarContainer: {
    position: "relative",
    marginBottom: 16,
  },
  avatar: {
    width: 120,
    height: 120,
    borderRadius: 60,
    borderWidth: 4,
    borderColor: "#e2e8f0",
  },
  cameraIcon: {
    position: "absolute",
    right: 0,
    bottom: 0,
    backgroundColor: colors.pastelBlue,
    borderRadius: 20,
    width: 40,
    height: 40,
    justifyContent: "center",
    alignItems: "center",
    borderWidth: 3,
    borderColor: "#fff",
    elevation: 2,
  },
  settingRow: {
    marginBottom: 16,
  },

  label: { fontSize: 14, fontWeight: "600", marginBottom: 8, color: "#4B5563" },

  toggleContainer: { flexDirection: "row", gap: 10 },
  toggleButton: {
    flex: 1,
    paddingVertical: 12,
    borderWidth: 1,
    borderColor: "#D1D5DB",
    borderRadius: 8,
    alignItems: "center",
    backgroundColor: "#F9FAFB"
  },
  selectedButton: { backgroundColor: colors.pastelGreen, borderColor: "#62b59a" },
  toggleButtonText: { color: "#374151", fontWeight: "600", textTransform: 'capitalize' },
  selectedButtonText: { color: "#1F2937" },

  participantsRow: { flexDirection: "row", gap: 15 },
  participantInput: { flex: 1 },
});