'use client';

import { useState } from 'react';
import { OrderItem, isOutOfStock, problemBadgeLabel } from '@/lib/types';
import { cn } from '@/lib/utils';
import CollectionItemCard from '@/components/CollectionItemCard';
import {
  ChevronDown,
  ChevronUp,
  MapPin,
  Navigation,
  Package,
  ShoppingCart,
  Hammer,
  Wrench,
  AlertTriangle,
  Layers,
} from 'lucide-react';

interface AreaColor {
  dot: string;
  light: string;
  text: string;
  ring: string;
}

interface AreaGroupProps {
  clusterId: string;
  label: string;
  items: OrderItem[];
  center: { latitude: number; longitude: number };
  color: AreaColor;
  isExpanded: boolean;
  viewMode: 'compact' | 'detailed';
  onToggle: () => void;
  onCollect: (item: OrderItem) => void;
  onProblem: (item: OrderItem) => void;
  onNavigate: (lat: number, lng: number, name: string) => void;
  onShowDetails: (item: OrderItem) => void;
}

function getItemIcon(item: OrderItem) {
  if (item.problem_flag) return <AlertTriangle size={12} className="text-red-500" />;
  const orderNumber = item.expand?.order?.order_number || '';
  if (orderNumber.toLowerCase().includes('breakdown')) return <Hammer size={12} className="text-orange-500" />;
  if (orderNumber.toLowerCase().includes('repair')) return <Wrench size={12} className="text-amber-500" />;
  if (item.is_stock_item) return <Package size={12} className="text-violet-500" />;
  return <ShoppingCart size={12} className="text-gray-400" />;
}
export default function AreaGroup({
  clusterId,
  label,
  items,
  center,
  color,
  isExpanded,
  viewMode,
  onToggle,
  onCollect,
  onProblem,
  onNavigate,
  onShowDetails,
}: AreaGroupProps) {
  const totalQty = items.reduce((sum, i) => sum + (i.order_qty || i.quantity || 0), 0);

  const uniqueSuppliers = Array.from(
    new Set(
      items
        .map(i => i.expand?.supplier?.suppliername)
        .filter((n): n is string => !!n)
    )
  );

  const hasCoords = center.latitude !== 0 && center.longitude !== 0;

  // Tracks whether any detailed-mode CollectionItemCard inside has
  // an open popover. We use this to lift the section's stacking
  // context so the popover paints above the next area group.
  const [childPopoverOpen, setChildPopoverOpen] = useState(false);

  return (
    <section
      className={cn(
        'relative rounded-2xl overflow-hidden transition-all duration-200 border',
        color.light,
        `border-[rgba(38,37,30,0.1)]`,
        `ring-1 ${color.ring}`,
        // z-[80] (above BottomNav's z-50) when a card popover is open
        // so the popover can paint above the bottom chrome. The
        // popover's own z-[60] is *inside* this section's stacking
        // context, so without this lift the popover would be hidden
        // behind the BottomNav.
        childPopoverOpen ? 'z-[80]' : 'z-10'
      )}
      aria-label={`${label} area group`}
    >
      <button
        onClick={onToggle}
        aria-expanded={isExpanded}
        aria-controls={`area-${clusterId}-items`}
        className="w-full text-left p-4 active:bg-[#ebeae5] transition-colors"
      >
        <div className="flex items-center gap-3">
          <div className={cn('w-9 h-9 rounded-xl flex items-center justify-center flex-shrink-0', color.dot)} aria-hidden="true">
            <Layers size={16} className="text-white" />
          </div>

          <div className="flex-1 min-w-0">
            <h2 className={cn('font-bold text-[17px] leading-snug', color.text)}>
              {label}
            </h2>
            {uniqueSuppliers.length > 0 && (
              <div className="flex flex-wrap gap-1.5 mt-1.5">
                {uniqueSuppliers.map((name) => (
                  <span
                    key={name}
                    className={cn(
                      'inline-flex items-center gap-1 px-2.5 py-1 rounded-lg text-[12px] font-semibold',
                      color.light,
                      color.text,
                      `ring-1 ${color.ring}`
                    )}
                  >
                    <MapPin size={10} aria-hidden="true" />
                    {name}
                  </span>
                ))}
              </div>
            )}
          </div>

          <div className="flex items-center gap-2 flex-shrink-0">
            <div className="flex flex-col items-end gap-0.5">
              <span className="text-[12px] font-bold text-[#26251e]">
                {items.length} item{items.length !== 1 ? 's' : ''}
              </span>
              <span className="text-[11px] text-[rgba(38,37,30,0.55)]">{totalQty} total</span>
            </div>
            <div className="flex items-center justify-center w-7 h-7" aria-hidden="true">
              {isExpanded ? (
                <ChevronUp size={18} className="text-[rgba(38,37,30,0.55)]" />
              ) : (
                <ChevronDown size={18} className="text-[rgba(38,37,30,0.55)]" />
              )}
            </div>
          </div>
        </div>

        {viewMode === 'compact' && !isExpanded && (
          <div className="mt-2 ml-12 flex items-center gap-1.5 flex-wrap">
            {items.slice(0, 3).map((item, i) => (
              <span key={item.id} className="text-[11px] text-[rgba(38,37,30,0.6)] truncate max-w-[140px]">
                {item.description || 'Item'}
                {i < Math.min(items.length, 3) - 1 && ','}
              </span>
            ))}
            {items.length > 3 && (
              <span className="text-[10px] text-[rgba(38,37,30,0.4)] font-medium">
                +{items.length - 3} more
              </span>
            )}
          </div>
        )}
      </button>

      {isExpanded && (
        <div
          id={`area-${clusterId}-items`}
          className="border-t border-[rgba(38,37,30,0.08)] animate-fade-in"
        >
          {viewMode === 'compact' ? (
            <ul className="divide-y divide-[rgba(38,37,30,0.05)]" role="list">
              {items.map((item) => {
                const expectedQty = item.order_qty || item.quantity || 0;
                return (
                  <li
                    key={item.id}
                    className={cn(
                      'flex items-center justify-between px-4 py-3 hover:bg-[#ebeae5] transition-colors',
                      // Out-of-stock rows carry a red left rail + tint so
                      // they read as blocked without relying on the pill
                      // alone. Colour is never the only signal — the
                      // "Out of stock" pill is always rendered too.
                      isOutOfStock(item) && 'bg-[#fdf2f4] border-l-[3px] border-l-[#cf2d56] pl-[13px]'
                    )}
                  >
                    <div className="flex items-center gap-2.5 min-w-0 flex-1">
                      {getItemIcon(item)}
                      <div className="min-w-0 flex-1">
                        <span className="text-sm text-[#26251e] truncate block">
                          {item.description || 'Unknown item'}
                        </span>
                        {item.expand?.supplier?.suppliername && (
                          <span className="text-[10px] text-[rgba(38,37,30,0.45)]">
                            {item.expand.supplier.suppliername}
                          </span>
                        )}
                      </div>
                      {item.problem_flag && (
                        <span
                          className={cn(
                            'text-[10px] px-1.5 py-0.5 rounded-full font-medium flex-shrink-0',
                            isOutOfStock(item)
                              ? 'bg-[#cf2d56] text-white'
                              : 'bg-[#fbeaef] text-[#8a1b3a]'
                          )}
                        >
                          {problemBadgeLabel(item)}
                        </span>
                      )}
                    </div>
                    <div className="flex items-center gap-3 flex-shrink-0 ml-2">
                      <span className="text-sm font-semibold text-[rgba(38,37,30,0.7)]">{expectedQty}×</span>
                      <div className="flex items-center gap-1">
                        <button
                          onClick={() => onCollect(item)}
                          aria-label={`Collect ${item.description || 'item'}`}
                          className="w-10 h-10 rounded-lg bg-[#1f8a65] text-white flex items-center justify-center active:bg-[#125a3e] transition-colors touch-manipulation min-h-[40px] min-w-[40px]"
                        >
                          <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="3" strokeLinecap="round" strokeLinejoin="round" aria-hidden="true"><polyline points="20 6 9 17 4 12"/></svg>
                        </button>
                        <button
                          onClick={() => onProblem(item)}
                          aria-label={`Report problem for ${item.description || 'item'}`}
                          className="w-10 h-10 rounded-lg bg-[#cf2d56] text-white flex items-center justify-center active:bg-[#8a1b3a] transition-colors touch-manipulation min-h-[40px] min-w-[40px]"
                        >
                          <AlertTriangle size={16} aria-hidden="true" />
                        </button>
                      </div>
                    </div>
                  </li>
                );
              })}
            </ul>
          ) : (
            <div className="p-3 space-y-2">
              {items.map((item) => (
                <CollectionItemCard
                  key={item.id}
                  item={item}
                  supplierColor={color}
                  compact
                  onCollect={onCollect}
                  onProblem={onProblem}
                  onNavigate={onNavigate}
                  onShowDetails={onShowDetails}
                  onPopoverChange={setChildPopoverOpen}
                />
              ))}
            </div>
          )}

          {hasCoords && (
            <div className="px-4 pb-3">
              <button
                onClick={() => onNavigate(center.latitude, center.longitude, label)}
                className={cn(
                  'w-full flex items-center justify-center gap-2 py-2.5 rounded-xl text-sm font-semibold text-white transition-all touch-manipulation press-feedback min-h-[44px]',
                  color.dot
                )}
              >
                <Navigation size={14} aria-hidden="true" />
                Navigate to {label}
              </button>
            </div>
          )}
        </div>
      )}
    </section>
  );
}