import React, { useState, useRef, useMemo } from 'react';
import {
  View,
  StyleSheet,
  TouchableOpacity,
  Animated,
  Dimensions,
} from 'react-native';
import { InsideHeader } from '../../components';
import {
  useFetchLiveTender,
  useFetchPurchaseTender,
} from '../../Services/ApiCall/Hooks';
import { ShoppingCart, Lock, Radio, Package } from 'lucide-react-native';
import { useNavigation } from '@react-navigation/native';
import NavigationString from '../../Constant/NavigationString';
import { useSelector } from 'react-redux';
import LiveTender from './LiveTender';
import PurchaseTenderAllList from './PurchaseTenderAllList';
import { useTheme } from '../../Hooks/useTheme';
import AppText from '../../components/AppText';

const { width: SCREEN_WIDTH } = Dimensions.get('window');
const TAB_HEIGHT = 48;
const HORIZONTAL_PADDING = 32;
const SWITCH_INSETS = 3;

const Tender = () => {
  const { colors, spacing, shadows } = useTheme();
  const Navigation = useNavigation() as any;
  const { data: liveTenderData }: any = useFetchLiveTender();
  const { data: purchaseTenderData }: any = useFetchPurchaseTender();
  const SelectedPurchaseList = useSelector((state: any) => state?.selectPurchaseTender);
  const reduxToken = useSelector((state: any) => state.token?.token);

  const liveCount = liveTenderData?.pages?.[0]?.totalCount || 0;
  const purchaseCount = purchaseTenderData?.pages?.[0]?.totalCount || 0;

  const TAB_WIDTH = useMemo(() => {
    const availableWidth = SCREEN_WIDTH - HORIZONTAL_PADDING - SWITCH_INSETS * 2;
    return availableWidth / 2;
  }, []);

  const [selectedTab, setSelectedTab] = useState<'live' | 'purchase'>('purchase');
  const translateX = useRef(new Animated.Value(TAB_WIDTH)).current;

  const onTabPress = (tab: 'live' | 'purchase', index: number) => {
    setSelectedTab(tab);
    Animated.spring(translateX, {
      toValue: index * TAB_WIDTH,
      useNativeDriver: true,
      friction: 8,
    }).start();
  };

  const isAuctionUser = reduxToken?.userType?.toLowerCase() === 'auction';
  const cartCount = SelectedPurchaseList.length;

  const styles = makeStyles(colors, spacing, shadows, TAB_WIDTH, TAB_HEIGHT);

  if (isAuctionUser) {
    return (
      <View style={styles.container}>
        <InsideHeader title="Tender" showArrow />
        <View style={styles.restrictedContainer}>
          <View style={styles.restrictedCard}>
            {/* Double-ring Lock Icon */}
            <View style={styles.lockRing}>
              <View style={styles.lockInner}>
                <Lock size={40} color={colors.primary} strokeWidth={1.8} />
              </View>
            </View>

            <AppText variant="h2" centered color={colors.text} style={styles.restrictedTitle as any}>
              Access Restricted
            </AppText>

            <AppText variant="body" centered color={colors.textSecondary} style={styles.restrictedMessage as any}>
              You're logged in as an{' '}
              <AppText variant="body" color={colors.primary} style={{ fontWeight: '700' } as any}>
                Auction user
              </AppText>
              {'. '}Tender features are not available for your account type.
            </AppText>

            <View style={styles.hintBox}>
              <AppText variant="bodySmall" centered color={colors.textSecondary}>
                Switch to a Tender account to access live & purchase tender features.
              </AppText>
            </View>

            <TouchableOpacity
              style={styles.loginButton}
              activeOpacity={0.85}
              onPress={() => Navigation.navigate(NavigationString.Login)}
            >
              <AppText variant="button" color={colors.buttonText} style={styles.loginBtnText as any}>
                Switch to Tender Login
              </AppText>
            </TouchableOpacity>
          </View>
        </View>
      </View>
    );
  }

  return (
    <View style={styles.container}>
      <InsideHeader title="Tender" showArrow />

      {/* Tab Row */}
      <View style={styles.topRow}>
        {/* Segmented Control */}
        <View
          style={[
            styles.switchWrapper,
            { width: TAB_WIDTH * 2 + SWITCH_INSETS * 2 },
          ]}
        >
          {/* Sliding pill */}
          <Animated.View
            pointerEvents="none"
            style={[
              styles.activeTab,
              { width: TAB_WIDTH, transform: [{ translateX }] },
            ]}
          />

          {/* Live Tab */}
          <TouchableOpacity
            style={[styles.tab, { width: TAB_WIDTH }]}
            activeOpacity={0.8}
            onPress={() => onTabPress('live', 0)}
          >
            <Radio
              size={13}
              color={selectedTab === 'live' ? colors.primary : colors.textSecondary}
              strokeWidth={2}
            />
            <AppText
              variant="caption"
              color={selectedTab === 'live' ? colors.primary : colors.textSecondary}
              style={[
                styles.tabText,
                selectedTab === 'live' && (styles.activeTabText as any),
              ]}
            >
              Live {liveCount ? `(${liveCount})` : ''}
            </AppText>
          </TouchableOpacity>

          {/* Purchase Tab */}
          <TouchableOpacity
            style={[styles.tab, { width: TAB_WIDTH }]}
            activeOpacity={0.8}
            onPress={() => onTabPress('purchase', 1)}
          >
            <Package
              size={13}
              color={selectedTab === 'purchase' ? colors.primary : colors.textSecondary}
              strokeWidth={2}
            />
            <AppText
              variant="caption"
              color={selectedTab === 'purchase' ? colors.primary : colors.textSecondary}
              style={[
                styles.tabText,
                selectedTab === 'purchase' && (styles.activeTabText as any),
              ]}
            >
              Purchased {purchaseCount ? `(${purchaseCount})` : ''}
            </AppText>
          </TouchableOpacity>
        </View>
      </View>

      {/* Content */}
      {selectedTab === 'live' ? <LiveTender /> : <PurchaseTenderAllList />}

      {/* Cart Floating Button */}
      <TouchableOpacity
        style={styles.cartFloatingButton}
        activeOpacity={0.9}
        onPress={() => Navigation.navigate(NavigationString.PurchaseTenderList)}
      >
        <ShoppingCart size={24} color={colors.buttonText} strokeWidth={2} />
        {cartCount > 0 && (
          <View style={styles.cartBadge}>
            <AppText variant="caption" color={colors.primary} style={styles.cartBadgeText as any}>
              {cartCount}
            </AppText>
          </View>
        )}
      </TouchableOpacity>
    </View>
  );
};

export default Tender;

/* ─── Styles factory ─── */
const makeStyles = (colors: any, spacing: any, shadows: any, TAB_WIDTH: number, TAB_HEIGHT: number) =>
  StyleSheet.create({
    container: {
      flex: 1,
      backgroundColor: colors.background,
    },

    /* ── Tab Row ── */
    topRow: {
      flexDirection: 'row',
      alignItems: 'center',
      justifyContent: 'center',
      paddingHorizontal: spacing.m,
      paddingVertical: spacing.s + 2,
    },
    switchWrapper: {
      flexDirection: 'row',
      backgroundColor: colors.surface,
      borderRadius: 16,
      padding: SWITCH_INSETS,
      height: TAB_HEIGHT,
      ...shadows.light,
    },
    tab: {
      height: TAB_HEIGHT - SWITCH_INSETS * 2,
      flexDirection: 'row',
      alignItems: 'center',
      justifyContent: 'center',
      gap: 5,
      zIndex: 2,
    },
    tabText: {
      fontWeight: '600',
      letterSpacing: 0.3,
    } as any,
    activeTabText: {
      fontWeight: '700',
    } as any,
    activeTab: {
      position: 'absolute',
      top: SWITCH_INSETS,
      left: SWITCH_INSETS,
      height: TAB_HEIGHT - SWITCH_INSETS * 2,
      backgroundColor: colors.background,
      borderRadius: 13,
      ...shadows.medium,
    },

    /* ── Cart Floating Button ── */
    cartFloatingButton: {
      position: 'absolute',
      bottom: spacing.xl + 80,
      right: spacing.l,
      width: 56,
      height: 56,
      borderRadius: 28,
      backgroundColor: colors.primary,
      alignItems: 'center',
      justifyContent: 'center',
      ...shadows.strong,
      zIndex: 999,
    },
    cartBadge: {
      position: 'absolute',
      top: 0,
      right: 0,
      minWidth: 20,
      height: 20,
      borderRadius: 10,
      backgroundColor: colors.background,
      alignItems: 'center',
      justifyContent: 'center',
      paddingHorizontal: 4,
      borderWidth: 1.5,
      borderColor: colors.primary,
    },
    cartBadgeText: {
      fontSize: 10,
      fontWeight: '800',
      lineHeight: 13,
    } as any,

    /* ── Restricted Access ── */
    restrictedContainer: {
      flex: 1,
      justifyContent: 'center',
      alignItems: 'center',
      padding: spacing.l,
      backgroundColor: colors.background,
    },
    restrictedCard: {
      backgroundColor: colors.surface,
      borderRadius: 28,
      padding: spacing.l,
      alignItems: 'center',
      width: '100%',
      maxWidth: 400,
      ...shadows.strong,
    },
    lockRing: {
      width: 100,
      height: 100,
      borderRadius: 50,
      backgroundColor: `${colors.primary}12`,
      alignItems: 'center',
      justifyContent: 'center',
      marginBottom: spacing.l,
      borderWidth: 1.5,
      borderColor: `${colors.primary}25`,
    },
    lockInner: {
      width: 72,
      height: 72,
      borderRadius: 36,
      backgroundColor: `${colors.primary}18`,
      alignItems: 'center',
      justifyContent: 'center',
    },
    restrictedTitle: {
      marginBottom: spacing.s + 4,
    } as any,
    restrictedMessage: {
      marginBottom: spacing.s,
      lineHeight: 24,
    } as any,
    hintBox: {
      backgroundColor: colors.overlay,
      borderRadius: 14,
      paddingHorizontal: spacing.m,
      paddingVertical: spacing.s + 2,
      marginBottom: spacing.l,
      width: '100%',
    },
    loginButton: {
      backgroundColor: colors.buttonPrimary,
      paddingHorizontal: spacing.l,
      paddingVertical: 14,
      borderRadius: 16,
      width: '100%',
      alignItems: 'center',
      ...shadows.medium,
    },
    loginBtnText: {
      letterSpacing: 1.2,
    } as any,
  });