'use client';

import { useState, useRef, useEffect } from 'react';
import { OrderItem } from '@/lib/types';
import { cn, formatDate, formatCurrency, parseCoordinates } from '@/lib/utils';
import { usePopoverPlacement } from '@/lib/hooks';
import { getItemDisplayDescription, getItemDisplayQty } from '@/lib/pocketbase';
import {
  Check,
  AlertTriangle,
  Navigation,
  ChevronDown,
  ChevronUp,
  Package,
  Wrench,
  Hammer,
  ShoppingCart,
  AlertCircle,
  Clock,
  MapPin,
  FileText,
  MessageSquare,
  ExternalLink,
} from 'lucide-react';

interface CollectionItemProps {
  item: OrderItem;
  supplierColor?: { dot: string; light: string; text: string; ring: string };
  compact?: boolean;
  onCollect: (item: OrderItem) => void;
  onProblem: (item: OrderItem) => void;
  onNavigate: (lat: number, lng: number, name: string) => void;
  // Opens the ItemDetailModal showing PO document + buyer notes
  onShowDetails: (item: OrderItem) => void;
  // Notifies the parent that a popover has opened/closed so it can
  // lift its own stacking layer — the card's z-30 alone can't escape
  // the section's stacking context, so the section needs to know.
  onPopoverChange?: (open: boolean) => void;
}

function getItemType(item: OrderItem): {
  type: string;
  icon: React.ReactNode;
  color: string;
  bgColor: string;
  label: string;
} {
  if (item.problem_flag) {
    return {
      type: 'problem',
      icon: <AlertTriangle size={16} />,
      color: 'text-[#b3224a]',
      bgColor: 'bg-[#fbeaef]',
      label: 'Problem',
    };
  }

  const orderNumber = item.expand?.order?.order_number || '';
  const poNumber = item.expand?.purchase_order?.po_number || '';

  if (item.is_stock_item) {
    return {
      type: 'stock',
      icon: <Package size={16} />,
      color: 'text-[#4a3d6b]',
      bgColor: 'bg-[#d4cae3]',
      label: 'Stock',
    };
  }

  if (orderNumber.startsWith('RPR') || poNumber.startsWith('RPR')) {
    return {
      type: 'repair',
      icon: <Wrench size={16} />,
      color: 'text-[#8a5a02]',
      bgColor: 'bg-[#f6e3a4]',
      label: 'Repair',
    };
  }

  if (orderNumber.startsWith('BRK') || poNumber.startsWith('BRK')) {
    return {
      type: 'breakdown',
      icon: <Hammer size={16} />,
      color: 'text-[#8a5a02]',
      bgColor: 'bg-[#f6e3a4]',
      label: 'Breakdown',
    };
  }

  return {
    type: 'normal',
    icon: <ShoppingCart size={16} />,
    color: 'text-[#26251e]',
    bgColor: 'bg-[#ebeae5]',
    label: 'Order',
  };
}

// Closes tooltip when clicking outside
function useClickOutside(ref: React.RefObject<HTMLElement | null>, onClose: () => void) {
  useEffect(() => {
    function handleClick(e: MouseEvent) {
      if (ref.current && !ref.current.contains(e.target as Node)) {
        onClose();
      }
    }
    document.addEventListener('mousedown', handleClick);
    return () => document.removeEventListener('mousedown', handleClick);
  }, [ref, onClose]);
}

export default function CollectionItemCard({
  item,
  supplierColor,
  compact,
  onCollect,
  onProblem,
  onNavigate,
  onShowDetails,
  onPopoverChange,
}: CollectionItemProps) {
  const [expanded, setExpanded] = useState(false);
  const [showNotesTooltip, setShowNotesTooltip] = useState(false);
  const [showPoTooltip, setShowPoTooltip] = useState(false);
  const notesTooltipRef = useRef<HTMLDivElement>(null);
  const poTooltipRef = useRef<HTMLDivElement>(null);
  // Button refs feed the placement hook so the popover flips above
  // the button when there's not enough room below it (e.g. on the
  // last item in a long list, where the default top-full direction
  // would push the popover under the BottomNav).
  const poButtonRef = useRef<HTMLButtonElement>(null);
  const notesButtonRef = useRef<HTMLButtonElement>(null);
  const { placement: poPlacement, measure: measurePoPlacement } = usePopoverPlacement(poButtonRef);
  const { placement: notesPlacement, measure: measureNotesPlacement } = usePopoverPlacement(notesButtonRef);
  useClickOutside(notesTooltipRef, () => setShowNotesTooltip(false));
  useClickOutside(poTooltipRef, () => setShowPoTooltip(false));

  // Bubble the open/close state up so the wrapping supplier/area
  // group can lift itself above the *next* group in the list.
  const popoverOpen = showNotesTooltip || showPoTooltip;
  useEffect(() => {
    onPopoverChange?.(popoverOpen);
  }, [popoverOpen, onPopoverChange]);

  const supplier = item.expand?.supplier;
  const itemType = getItemType(item);
  const coords = parseCoordinates(supplier?.coordinates);
  const hasCoords = coords !== null;
  const description = getItemDisplayDescription(item);
  const expectedQty = getItemDisplayQty(item);

  const po = item.expand?.purchase_order;
  const order = item.expand?.order;
  const poNumber = po?.po_number;
  const orderNumber = order?.order_number;
  const hasNotes = Boolean(item.notes?.trim());
  const hasProblemNotes = Boolean(item.problem_notes?.trim());
  const hasAnyNotes = hasNotes || hasProblemNotes;

  return (
    <article
      className={cn(
        compact
          ? 'bg-[#ebeae5] rounded-xl overflow-visible'
          : 'bg-[#e6e5e0] rounded-2xl card-press overflow-visible border border-[rgba(38,37,30,0.1)]',
        // z-[80] (above the BottomNav's z-50) when a popover is open,
        // so the popover can paint above the bottom chrome. The
        // popover's own z-[60] is *inside* this article's stacking
        // context, so without this lift the popover's effective page
        // z-index is only 80 — wait, this is the article's z. The
        // popover stacks at this z in the page context.
        (showNotesTooltip || showPoTooltip) && 'relative z-[80]',
        item.problem_flag && 'ring-1 ring-[#cf2d56]'
      )}
    >
      {/* Header */}
      <button
        className="w-full text-left p-4 active:bg-[rgba(38,37,30,0.04)] transition-colors"
        onClick={() => setExpanded(!expanded)}
        aria-expanded={expanded}
        aria-controls={`item-${item.id}-details`}
      >
        <div className="flex items-start gap-3">
          {/* Type icon */}
          <div className={cn(
            'w-9 h-9 rounded-xl flex items-center justify-center flex-shrink-0 mt-0.5',
            itemType.bgColor
          )} aria-hidden="true">
            <span className={itemType.color}>{itemType.icon}</span>
          </div>

          {/* Main content */}
          <div className="flex-1 min-w-0">
            <div className="flex items-center gap-2 mb-0.5">
              <h3 className="font-semibold text-[15px] text-[#26251e] truncate leading-snug flex-1">
                {description}
              </h3>
            </div>

            {/* PO and Order numbers — always visible in compact mode */}
            {compact && (poNumber || orderNumber) && (
              <div className="flex items-center gap-2 mb-0.5 -mt-0.5">
                {poNumber && (
                  <span className="text-[10px] text-[rgba(38,37,30,0.5)] font-mono">
                    PO: {poNumber}
                  </span>
                )}
                {poNumber && orderNumber && (
                  <span className="text-[10px] text-[rgba(38,37,30,0.3)]" aria-hidden="true">·</span>
                )}
                {orderNumber && (
                  <span className="text-[10px] text-[rgba(38,37,30,0.5)]">
                    Order: {orderNumber}
                  </span>
                )}
              </div>
            )}

            {/* If the customer-facing description differs from the
                supplier-facing one we just rendered, surface the
                customer one as a smaller sub-line so the driver can
                spot a discrepancy on pickup. */}
            {item.description && item.po_description && item.description.trim() !== item.po_description.trim() && (
              <p className="text-[11px] text-[rgba(38,37,30,0.55)] truncate -mt-0.5 mb-0.5">
                customer line: {item.description}
              </p>
            )}

            <div className="flex items-center gap-1.5 flex-wrap">
              <span className={cn(
                'text-[10px] px-2 py-0.5 rounded-full font-semibold uppercase tracking-wide',
                itemType.type === 'problem' && 'bg-[#f3c4d2] text-[#8a1b3a]',
                itemType.type === 'breakdown' && 'bg-[#f6e3a4] text-[#8a5a02]',
                itemType.type === 'repair' && 'bg-[#f6e3a4] text-[#8a5a02]',
                itemType.type === 'stock' && 'bg-[#d4cae3] text-[#4a3d6b]',
                itemType.type === 'normal' && 'bg-[#ebeae5] text-[#26251e]'
              )}>
                {itemType.label}
              </span>
              <span className="text-xs text-[rgba(38,37,30,0.6)]">Qty: {expectedQty}</span>
              {item.sku && (
                <span className="text-[10px] text-[rgba(38,37,30,0.55)] font-mono">#{item.sku}</span>
              )}
              {item.assigned_at && (
                <span className="text-[10px] text-[rgba(38,37,30,0.45)] flex items-center gap-0.5">
                  <Clock size={9} aria-hidden="true" />
                  assigned {formatDate(item.assigned_at)}
                </span>
              )}
            </div>

            {supplier?.suppliername && !compact && (
              <div className="flex items-center gap-1 mt-1.5">
                <MapPin size={12} className="text-[rgba(38,37,30,0.4)] flex-shrink-0" aria-hidden="true" />
                <span className="text-xs text-[rgba(38,37,30,0.55)] truncate">{supplier.suppliername}</span>
              </div>
            )}
          </div>

          {/* Right side — tooltip buttons always visible in compact mode */}
          {compact ? (
            <div className="flex flex-col items-center gap-1.5 flex-shrink-0">
              {/* Price + chevron row */}
              <div className="flex items-center gap-2">
                {item.selling_price && expectedQty > 0 && (
                  <span className="text-xs font-semibold text-[#125a3e]">
                    {formatCurrency(item.selling_price * expectedQty)}
                  </span>
                )}
                {expanded ? (
                  <ChevronUp size={18} className="text-[rgba(38,37,30,0.55)]" aria-hidden="true" />
                ) : (
                  <ChevronDown size={18} className="text-[rgba(38,37,30,0.55)]" aria-hidden="true" />
                )}
              </div>
              {/* Always-visible tooltip buttons — shown as a row of 2 */}
              <div className="flex items-center gap-1">
                {/* PO tooltip button */}
                <div className="relative">
                  <button
                    ref={poButtonRef}
                    onClick={(e) => {
                      e.stopPropagation();
                      measurePoPlacement();
                      setShowPoTooltip(v => !v);
                      setShowNotesTooltip(false);
                    }}
                    aria-label="Show PO details"
                    aria-expanded={showPoTooltip}
                    className="w-6 h-6 rounded-md flex items-center justify-center bg-[#6c5a99] text-white active:bg-[#4a3d6b] transition-colors"
                  >
                    <FileText size={11} aria-hidden="true" />
                  </button>
                  {/* PO tooltip popover */}
                  {showPoTooltip && (
                    <div
                      ref={poTooltipRef}
                      className={cn(
                        'absolute right-0 z-[60] w-64 bg-white border border-[rgba(38,37,30,0.15)] rounded-xl shadow-lg p-3',
                        // Flip above the button when there's not enough
                        // room below — keeps the popover out from under
                        // the BottomNav on the last item in a long list.
                        poPlacement === 'down' ? 'top-full mt-1' : 'bottom-full mb-1'
                      )}
                    >
                      {po ? (
                        <>
                          <div className="flex items-center justify-between mb-2">
                            <p className="text-[11px] font-semibold text-[#26251e] uppercase tracking-wide">Purchase Order</p>
                            <button
                              onClick={(e) => { e.stopPropagation(); setShowPoTooltip(false); }}
                              aria-label="Close"
                              className="w-5 h-5 rounded flex items-center justify-center hover:bg-[rgba(38,37,30,0.08)]"
                            >
                              <span className="text-[rgba(38,37,30,0.4)] text-sm">×</span>
                            </button>
                          </div>
                          <dl className="space-y-1.5 text-xs">
                            <div className="flex justify-between">
                              <dt className="text-[rgba(38,37,30,0.55)]">PO Number</dt>
                              <dd className="text-[#26251e] font-medium font-mono">{po.po_number}</dd>
                            </div>
                            {po.status && (
                              <div className="flex justify-between">
                                <dt className="text-[rgba(38,37,30,0.55)]">Status</dt>
                                <dd className="text-[#26251e] font-medium capitalize">{po.status}</dd>
                              </div>
                            )}
                            {po.total_amount != null && (
                              <div className="flex justify-between">
                                <dt className="text-[rgba(38,37,30,0.55)]">Total</dt>
                                <dd className="text-[#26251e] font-medium">R{(po.total_amount / 100).toFixed(2)}</dd>
                              </div>
                            )}
                            {orderNumber && (
                              <div className="flex justify-between">
                                <dt className="text-[rgba(38,37,30,0.55)]">Order</dt>
                                <dd className="text-[#26251e] font-medium">{orderNumber}</dd>
                              </div>
                            )}
                          </dl>
                          <button
                            onClick={(e) => { e.stopPropagation(); setShowPoTooltip(false); onShowDetails(item); }}
                            className="mt-3 w-full flex items-center justify-center gap-2 py-2 rounded-lg bg-[#6c5a99] text-white text-[12px] font-semibold active:bg-[#4a3d6b] transition-colors"
                          >
                            <ExternalLink size={13} aria-hidden="true" />
                            View PO &amp; Document
                          </button>
                        </>
                      ) : (
                        <div className="text-center py-2">
                          <p className="text-xs text-[rgba(38,37,30,0.55)]">No PO attached</p>
                          <button
                            onClick={(e) => { e.stopPropagation(); setShowPoTooltip(false); onShowDetails(item); }}
                            className="mt-2 text-[11px] text-[#6c5a99] font-medium hover:underline"
                          >
                            View details
                          </button>
                        </div>
                      )}
                    </div>
                  )}
                </div>

                {/* Notes tooltip button */}
                {hasAnyNotes && (
                  <div className="relative">
                    <button
                      ref={notesButtonRef}
                      onClick={(e) => {
                        e.stopPropagation();
                        measureNotesPlacement();
                        setShowNotesTooltip(v => !v);
                        setShowPoTooltip(false);
                      }}
                      aria-label="Show notes"
                      aria-expanded={showNotesTooltip}
                      className="w-6 h-6 rounded-md flex items-center justify-center bg-[#8a5a02] text-white active:bg-[#6b4501] transition-colors"
                    >
                      <MessageSquare size={11} aria-hidden="true" />
                    </button>
                    {/* Notes tooltip popover */}
                    {showNotesTooltip && (
                      <div
                        ref={notesTooltipRef}
                        className={cn(
                          'absolute right-0 z-[60] w-64 bg-white border border-[rgba(38,37,30,0.15)] rounded-xl shadow-lg p-3',
                          notesPlacement === 'down' ? 'top-full mt-1' : 'bottom-full mb-1'
                        )}
                      >
                        <div className="flex items-center justify-between mb-2">
                          <p className="text-[11px] font-semibold text-[#26251e] uppercase tracking-wide">Buyer Notes</p>
                          <button
                            onClick={(e) => { e.stopPropagation(); setShowNotesTooltip(false); }}
                            aria-label="Close"
                            className="w-5 h-5 rounded flex items-center justify-center hover:bg-[rgba(38,37,30,0.08)]"
                          >
                            <span className="text-[rgba(38,37,30,0.4)] text-sm">×</span>
                          </button>
                        </div>
                        {hasNotes ? (
                          <>
                            <p className="text-[11px] text-[#8a5a02] bg-[#fcf3d8] border border-[#f6e3a4] rounded-lg p-2 selectable leading-snug">
                              {item.notes}
                            </p>
                            {hasProblemNotes && (
                              <p className="text-[11px] text-[#8a1b3a] bg-[#fbeaef] border border-[#f3c4d2] rounded-lg p-2 mt-2 selectable leading-snug">
                                <span className="font-semibold">Problem: </span>{item.problem_notes}
                              </p>
                            )}
                          </>
                        ) : hasProblemNotes ? (
                          <p className="text-[11px] text-[#8a1b3a] bg-[#fbeaef] border border-[#f3c4d2] rounded-lg p-2 selectable leading-snug">
                            {item.problem_notes}
                          </p>
                        ) : (
                          <p className="text-xs text-[rgba(38,37,30,0.55)] text-center py-1">No notes</p>
                        )}
                      </div>
                    )}
                  </div>
                )}
              </div>
            </div>
          ) : (
            /* Full/non-compact right side */
            <div className="flex items-center gap-2 flex-shrink-0">
              {item.selling_price && expectedQty > 0 && (
                <span className="text-xs font-semibold text-[#125a3e]">
                  {formatCurrency(item.selling_price * expectedQty)}
                </span>
              )}
              {expanded ? (
                <ChevronUp size={18} className="text-[rgba(38,37,30,0.55)]" aria-hidden="true" />
              ) : (
                <ChevronDown size={18} className="text-[rgba(38,37,30,0.55)]" aria-hidden="true" />
              )}
            </div>
          )}
        </div>
      </button>

      {/* Expanded Details */}
      {expanded && (
        <div
          id={`item-${item.id}-details`}
          className="px-4 pb-4 border-t border-[rgba(38,37,30,0.08)] animate-fade-in"
        >
          <div className="pt-3 space-y-3">
            {/* Notes */}
            {item.notes && (
              <div className="bg-[#fcf3d8] border border-[#f6e3a4] rounded-xl p-3">
                <p className="text-xs text-[#8a5a02] flex items-start gap-2">
                  <AlertCircle size={14} className="flex-shrink-0 mt-0.5" aria-hidden="true" />
                  <span className="selectable">{item.notes}</span>
                </p>
              </div>
            )}

            {item.problem_notes && (
              <div className="bg-[#fbeaef] border border-[#f3c4d2] rounded-xl p-3">
                <p className="text-xs text-[#8a1b3a] flex items-start gap-2">
                  <AlertTriangle size={14} className="flex-shrink-0 mt-0.5" aria-hidden="true" />
                  <span className="selectable">{item.problem_notes}</span>
                </p>
              </div>
            )}

            {/* Details grid */}
            <dl className="grid grid-cols-2 gap-2 text-xs">
              {orderNumber && (
                <div className="bg-[#ebeae5] rounded-lg p-2">
                  <dt className="text-[rgba(38,37,30,0.55)]">Order</dt>
                  <dd className="text-[#26251e] font-medium">{orderNumber}</dd>
                </div>
              )}
              {poNumber && (
                <div className="bg-[#ebeae5] rounded-lg p-2">
                  <dt className="text-[rgba(38,37,30,0.55)]">PO</dt>
                  <dd className="text-[#26251e] font-medium">{poNumber}</dd>
                </div>
              )}
              {supplier?.supplieraddress && (
                <div className="bg-[#ebeae5] rounded-lg p-2 col-span-2">
                  <dt className="text-[rgba(38,37,30,0.55)]">Address</dt>
                  <dd className="text-[#26251e] font-medium selectable">{supplier.supplieraddress}</dd>
                </div>
              )}
            </dl>
            {/* Action Buttons */}
            <div className="space-y-2 pt-1">
              {/* Row 1 — core workflow */}
              <div className="grid grid-cols-3 gap-2">
                <button
                  onClick={() => onCollect(item)}
                  aria-label={`Mark ${description} as collected`}
                  className="flex flex-col items-center justify-center gap-1 py-3 rounded-xl bg-[#1f8a65] text-white active:bg-[#125a3e] transition-colors touch-manipulation press-feedback-sm min-h-[56px]"
                >
                  <Check size={18} strokeWidth={2.5} aria-hidden="true" />
                  <span className="text-xs font-semibold">Collect</span>
                </button>

                <button
                  onClick={() => onProblem(item)}
                  aria-label={`Report problem with ${description}`}
                  className="flex flex-col items-center justify-center gap-1 py-3 rounded-xl bg-[#cf2d56] text-white active:bg-[#8a1b3a] transition-colors touch-manipulation press-feedback-sm min-h-[56px]"
                >
                  <AlertTriangle size={18} strokeWidth={2.5} aria-hidden="true" />
                  <span className="text-xs font-semibold">Problem</span>
                </button>

                {hasCoords && coords && supplier ? (
                  <button
                    onClick={() => onNavigate(coords.latitude, coords.longitude, supplier.suppliername)}
                    aria-label={`Navigate to ${supplier.suppliername}`}
                    className="flex flex-col items-center justify-center gap-1 py-3 rounded-xl bg-[#f54e00] text-white active:bg-[#d44200] transition-colors touch-manipulation press-feedback-sm min-h-[56px]"
                  >
                    <Navigation size={18} strokeWidth={2.5} aria-hidden="true" />
                    <span className="text-xs font-semibold">Navigate</span>
                  </button>
                ) : (
                  <div className="flex flex-col items-center justify-center gap-1 py-3 rounded-xl bg-[rgba(38,37,30,0.06)] text-[rgba(38,37,30,0.4)] min-h-[56px]" aria-label="No GPS coordinates available">
                    <Navigation size={18} aria-hidden="true" />
                    <span className="text-xs font-medium">No GPS</span>
                  </div>
                )}
              </div>

              {/* Row 2 — PO document and buyer notes */}
              <div className="grid grid-cols-2 gap-2">
                <button
                  onClick={() => onShowDetails(item)}
                  aria-label={`View PO document for ${description}`}
                  className="flex flex-col items-center justify-center gap-1 py-3 rounded-xl bg-[#6c5a99] text-white active:bg-[#4a3d6b] transition-colors touch-manipulation press-feedback-sm min-h-[56px]"
                >
                  <FileText size={18} strokeWidth={2.5} aria-hidden="true" />
                  <span className="text-xs font-semibold">View PO</span>
                </button>

                <button
                  onClick={() => onShowDetails(item)}
                  aria-label={`View buyer notes for ${description}`}
                  className="flex flex-col items-center justify-center gap-1 py-3 rounded-xl bg-[#8a5a02] text-white active:bg-[#6b4501] transition-colors touch-manipulation press-feedback-sm min-h-[56px]"
                >
                  <MessageSquare size={18} strokeWidth={2.5} aria-hidden="true" />
                  <span className="text-xs font-semibold">Buyer Notes</span>
                </button>
              </div>
            </div>
          </div>
        </div>
      )}
    </article>
  );
}