import { useTheme } from '@/components/ThemeContext';
import { useMutation, useQueryClient } from '@tanstack/react-query';
import { useRouter } from 'expo-router';
import { ArrowLeft } from 'lucide-react-native';
import React, { useState } from 'react';
import { useTranslation } from 'react-i18next';
import {
  ActivityIndicator,
  Pressable,
  ScrollView,
  StyleSheet,
  Switch,
  Text,
  TextInput,
  View
} from 'react-native';
import { Toast } from 'toastify-react-native';
import { user_api } from '../lib/api';

type FormType = {
  code: string;
  referral_share: string;
  description: string;
  is_agent: boolean;
};

export default function CreateReferrals() {
  const { isDark } = useTheme();
  const { t } = useTranslation();
  const router = useRouter();
  const queryClient = useQueryClient();
  const [form, setForm] = useState<FormType>({
    code: '',
    referral_share: '',
    description: '',
    is_agent: false,
  });

  const { mutate, isPending } = useMutation({
    mutationFn: (body: {
      code: string;
      referral_share: number;
      description: string;
      is_agent: boolean;
    }) => user_api.create_referral(body),
    onSuccess: () => {
      Toast.success(t('Referral yaratildi'));
      queryClient.refetchQueries({ queryKey: ['my_referrals'] });
      router.back();
    },
    onError: () => {
      Toast.error(t('Xatolik yuz berdi'));
    },
  });

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

  const update = (key: keyof FormType, value: any) => setForm((p) => ({ ...p, [key]: value }));

  const validate = () => {
    const e: any = {};

    if (!form.description || form.description.length < 5)
      e.description = 'Tavsif kamida 5 ta belgidan iborat bo‘lishi kerak';

    if (form.is_agent) {
      if (!form.referral_share || Number(form.referral_share) <= 0)
        e.referral_share = 'Agent uchun foiz majburiy';
    }

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

  const handleSave = () => {
    if (!validate()) return;

    const payload = {
      code: form.code,
      referral_share: form.is_agent ? Number(form.referral_share) : 0,
      description: form.description,
      is_agent: form.is_agent,
    };

    mutate(payload);
  };

  return (
    <View style={{ flex: 1, backgroundColor: isDark ? '#0f172a' : '#f8fafc' }}>
      {/* HEADER */}
      <View style={[styles.header, { backgroundColor: isDark ? '#0f172a' : '#fff' }]}>
        <Pressable onPress={() => router.back()}>
          <ArrowLeft color={isDark ? '#fff' : '#0f172a'} />
        </Pressable>

        <Text style={[styles.headerTitle, { color: isDark ? '#fff' : '#0f172a' }]}>
          {t('Referral yaratish')}
        </Text>

        <Pressable onPress={handleSave}>
          {isPending ? (
            <ActivityIndicator size={'small'} />
          ) : (
            <Text style={styles.save}>{t('Saqlash')}</Text>
          )}
        </Pressable>
      </View>

      <ScrollView contentContainerStyle={styles.container}>
        {/* NOM */}
        <Text style={[styles.label, { color: isDark ? '#fff' : '#0f172a' }]}>
          {t('Referral nomi')}
        </Text>
        <View style={[styles.inputBox, theme(isDark)]}>
          <TextInput
            maxLength={9}
            style={[styles.input, { color: isDark ? '#fff' : '#0f172a' }]}
            placeholder="ABC123"
            placeholderTextColor="#94a3b8"
            value={form.code}
            onChangeText={(v) => update('code', v)}
          />
        </View>
        {errors.code && <Text style={styles.error}>{t(errors.code)}</Text>}

        {/* TAVSIF */}
        <Text style={[styles.label, { color: isDark ? '#fff' : '#0f172a' }]}>{t('Tavsif')}</Text>
        <View style={[styles.inputBox, styles.textArea, theme(isDark)]}>
          <TextInput
            multiline
            textAlignVertical="top"
            style={[styles.input, { color: isDark ? '#fff' : '#0f172a' }]}
            placeholder={t('Batafsil yozing...')}
            placeholderTextColor="#94a3b8"
            value={form.description}
            onChangeText={(v) => update('description', v)}
          />
        </View>
        {errors.description && <Text style={styles.error}>{t(errors.description)}</Text>}

        {/* AGENT SWITCH */}
        <View style={styles.switchRow}>
          <Text style={[styles.label, { color: isDark ? '#fff' : '#0f172a' }]}>
            {t('Agentmi?')}
          </Text>
          <Switch
            value={form.is_agent}
            onValueChange={(v) => {
              update('is_agent', v);
              if (!v) update('referral_share', '');
            }}
          />
        </View>

        {/* 👉 FOIZ FAQAT AGENT YOQILGANDA */}
        {form.is_agent && (
          <>
            <Text style={[styles.label, { color: isDark ? '#fff' : '#0f172a' }]}>
              {t('Referral foizi (%)')}
            </Text>
            <View style={[styles.inputBox, theme(isDark)]}>
              <TextInput
                maxLength={1}
                keyboardType="numeric"
                style={[styles.input, { color: isDark ? '#fff' : '#0f172a' }]}
                placeholder="5"
                placeholderTextColor="#94a3b8"
                value={form.referral_share}
                onChangeText={(v) => {
                  // faqat 1–5 oralig‘ini qabul qiladi
                  if (v === '') {
                    update('referral_share', '');
                    return;
                  }

                  const num = Number(v);
                  if (num >= 1 && num <= 5) {
                    update('referral_share', v);
                  }
                }}
              />
            </View>
            {errors.referral_share && <Text style={styles.error}>{t(errors.referral_share)}</Text>}
          </>
        )}
      </ScrollView>
    </View>
  );
}

const theme = (isDark: boolean) => ({
  backgroundColor: isDark ? '#1e293b' : '#fff',
  borderColor: isDark ? '#334155' : '#e2e8f0',
});

const styles = StyleSheet.create({
  header: {
    padding: 16,
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    elevation: 3,
  },
  headerTitle: { fontSize: 18, fontWeight: '700' },
  save: { color: '#3b82f6', fontSize: 16, fontWeight: '600' },

  container: { padding: 16, gap: 10 },
  label: { fontSize: 15, fontWeight: '700' },
  error: { color: '#ef4444', fontSize: 13, marginLeft: 6 },

  inputBox: {
    flexDirection: 'row',
    borderRadius: 16,
    borderWidth: 1,
    paddingHorizontal: 6,
    height: 56,
  },
  textArea: { height: 120, alignItems: 'flex-start' },
  input: {
    flex: 1,
    fontSize: 16,
  },

  switchRow: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'center',
    marginTop: 10,
  },
});