import { useEffect, useState, useMemo } from "react";
import {
  Printer, RefreshCw, Loader2, QrCode, Plus, Settings, X,
  Package, Hash, Tag, MapPin, Clock, Pencil, Trash2, Save, AlertTriangle,
  Search, ChevronDown, ChevronRight, Warehouse, Barcode,
} from "lucide-react";
import api from "../../services/api";
import type { ProductResponse } from "../../types/admin";
import CreateProductDialog from "./CreateProductDialog";
import {
  getLabelPreview, executePrint, type LabelPreviewRequest,
} from "../../services/printApi";
import { useToast } from "../../components/ui/Toast";
import { getStatusConfig } from "../../constants/task";

const QR_BASE = "/api/v1/products/qrcode";

const STATUS_TABS = [
  { key: "", label: "全部" },
  { key: "PENDING", label: "待接收" },
  { key: "WIP", label: "进行中" },
  { key: "COMPLETED", label: "已完成" },
  { key: "ARCHIVED", label: "已入库" },
];

interface ProductGroup { groupKey: string; products: ProductResponse[]; allInWarehouse: boolean; }

export default function AdminProductsPage() {
  const { toast } = useToast();
  const [products, setProducts] = useState<ProductResponse[]>([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const [showCreate, setShowCreate] = useState(false);

  // 搜索 & 筛选 & 分组
  const [keyword, setKeyword] = useState("");
  const [statusFilter, setStatusFilter] = useState("");
  const [groupBy, setGroupBy] = useState<"order" | "device">("order");
  const [expandedGroups, setExpandedGroups] = useState<Set<string>>(new Set());

  // 打印
  const [printTarget, setPrintTarget] = useState<ProductResponse | null>(null);
  const [previewUrl, setPreviewUrl] = useState<string | null>(null);
  const [printLoading, setPrintLoading] = useState(false);
  const [printCopies, setPrintCopies] = useState(1);
  const [printing, setPrinting] = useState(false);

  // 编辑
  const [editTarget, setEditTarget] = useState<ProductResponse | null>(null);
  const [editOrderNo, setEditOrderNo] = useState("");
  const [editExternalSerial, setEditExternalSerial] = useState("");
  const [editSaving, setEditSaving] = useState(false);

  // 删除防呆
  const [deleteTarget, setDeleteTarget] = useState<ProductResponse | null>(null);
  const [deleting, setDeleting] = useState(false);
  const [countdown, setCountdown] = useState(5);
  const [serialInput, setSerialInput] = useState("");
  const canConfirmDelete = countdown <= 0 && serialInput === deleteTarget?.serial_number;

  async function loadProducts() {
    setLoading(true); setError(null);
    try {
      const { data } = await api.get<ProductResponse[]>("/products/", {
        params: { limit: 1000, ...(keyword.trim() ? { keyword: keyword.trim() } : {}) },
      });
      setProducts(data);
    } catch { setError("加载产品列表失败"); }
    finally { setLoading(false); }
  }

  useEffect(() => { loadProducts(); }, []); // eslint-disable-line react-hooks/exhaustive-deps

  function handleSearch(e?: React.FormEvent) { e?.preventDefault(); setExpandedGroups(new Set()); loadProducts(); }

  // ---- 分组 + 状态过滤 ----
  const productGroups = useMemo<ProductGroup[]>(() => {
    const map = new Map<string, ProductResponse[]>();
    for (const p of products) {
      if (statusFilter) {
        const s = (p.macro_status || p.status).toUpperCase();
        if (s !== statusFilter) continue;
      }
      const key = groupBy === "device"
        ? (p.material_name || p.material_id || "未命名设备")
        : (p.order_no || "未绑定订单");
      if (!map.has(key)) map.set(key, []);
      map.get(key)!.push(p);
    }
    return Array.from(map.entries()).sort(([a], [b]) => a.localeCompare(b)).map(([groupKey, prods]) => ({
      groupKey, products: prods,
      allInWarehouse: prods.every(p => p.current_location_id === "virtual_warehouse"),
    }));
  }, [products, statusFilter, groupBy]);

  function toggleGroup(key: string) {
    setExpandedGroups(prev => { const n = new Set(prev); if (n.has(key)) n.delete(key); else n.add(key); return n; });
  }

  // ---- 打印 ----
  async function handleOpenPrint(product: ProductResponse) { /* unchanged */ setPrintTarget(product); setPreviewUrl(null); setPrintCopies(1); setPrintLoading(true); try { setPreviewUrl(await getLabelPreview({ serial_number: product.serial_number, material_name: product.material_name ?? product.material_id ?? "", spec_model: product.spec_model ?? "", order_no: product.order_no ?? "" })); } catch (err: any) { toast(err?.response?.data?.detail ?? "生成预览失败", "error"); setPrintTarget(null); } finally { setPrintLoading(false); } }
  async function handleConfirmPrint() { if (!printTarget) return; setPrinting(true); try { const r = await executePrint({ serial_number: printTarget.serial_number, material_name: printTarget.material_name ?? "", spec_model: printTarget.spec_model ?? "", order_no: printTarget.order_no ?? "", copies: printCopies }); toast(r.message, "success"); setPrintTarget(null); } catch (err: any) { toast(err?.response?.data?.detail ?? "打印失败", "error"); } finally { setPrinting(false); } }

  // ---- 编辑 ----
  function openEdit(p: ProductResponse) { setEditTarget(p); setEditOrderNo(p.order_no ?? ""); setEditExternalSerial(p.external_serial ?? ""); }
  async function handleSaveEdit() { if (!editTarget) return; setEditSaving(true); try { await api.patch(`/products/${editTarget.id}`, { order_no: editOrderNo.trim() || null, external_serial: editExternalSerial.trim() || null }); toast("保存成功", "success"); setEditTarget(null); loadProducts(); } catch (err: any) { toast(err?.response?.data?.detail ?? "保存失败", "error"); } finally { setEditSaving(false); } }

  // ---- 删除 ----
  useEffect(() => {
    if (!deleteTarget) { setCountdown(5); setSerialInput(""); return; }
    setCountdown(5); setSerialInput("");
    const timer = setInterval(() => setCountdown(c => { if (c <= 1) { clearInterval(timer); return 0; } return c - 1; }), 1000);
    return () => clearInterval(timer);
  }, [deleteTarget?.id]); // eslint-disable-line

  function confirmDelete(p: ProductResponse) { setDeleteTarget(p); }
  async function handleDelete() { if (!deleteTarget) return; setDeleting(true); try { await api.delete(`/products/${deleteTarget.id}`); toast("已删除", "success"); setDeleteTarget(null); loadProducts(); } catch (err: any) { toast(err?.response?.data?.detail ?? "删除失败", "error"); } finally { setDeleting(false); } }

  return (
    <div>
      {/* 标题栏 */}
      <div className="mb-6 flex items-center justify-between">
        <div><h2 className="text-xl font-bold text-gray-800">产品管理</h2><p className="mt-1 text-sm text-gray-500">查看所有产品身份证并生成二维码</p></div>
        <div className="flex gap-2">
          <a href="/admin/print-config" className="flex items-center gap-1.5 rounded-lg border border-gray-200 bg-white px-3 py-2 text-sm text-gray-500 hover:bg-gray-50"><Settings className="h-4 w-4" /></a>
          <button onClick={() => setShowCreate(true)} className="flex items-center gap-1.5 rounded-lg bg-blue-600 px-4 py-2 text-sm font-medium text-white hover:bg-blue-700"><Plus className="h-4 w-4" />创建产品</button>
          <button onClick={loadProducts} className="flex items-center gap-1.5 rounded-lg border border-gray-200 bg-white px-4 py-2 text-sm text-gray-600 hover:bg-gray-50"><RefreshCw className={`h-4 w-4 ${loading ? "animate-spin" : ""}`} />刷新</button>
        </div>
      </div>

      {/* 搜索 + 分组 + 状态过滤（移植自 AdminTasksPage） */}
      <div className="mb-6 rounded-xl bg-white p-4 shadow-sm">
        <div className="mb-3 flex items-center gap-2">
          <span className="text-xs text-gray-400">分组:</span>
          {(["order", "device"] as const).map(m => (
            <button key={m} onClick={() => setGroupBy(m)} className={`rounded-full px-3 py-1 text-xs font-medium transition-colors ${groupBy === m ? "bg-blue-600 text-white" : "bg-gray-100 text-gray-500 hover:bg-gray-200"}`}>
              {m === "order" ? "按订单" : "按设备"}
            </button>
          ))}
        </div>
        <form onSubmit={handleSearch} className="flex items-center gap-2">
          <div className="relative flex-1 max-w-xl">
            <Search className="absolute left-3 top-1/2 h-4 w-4 -translate-y-1/2 text-gray-400" />
            <input type="text" value={keyword} onChange={(e) => setKeyword(e.target.value)} placeholder="搜索产品身份证、订单号、规格型号..." className="w-full rounded-lg border border-gray-200 py-2.5 pl-9 pr-3 text-sm focus:border-blue-400 focus:outline-none focus:ring-2 focus:ring-blue-100" />
          </div>
          <button type="submit" disabled={loading} className="flex items-center gap-1.5 rounded-lg bg-blue-600 px-5 py-2.5 text-sm font-medium text-white hover:bg-blue-700 disabled:opacity-50">
            {loading ? <Loader2 className="h-4 w-4 animate-spin" /> : <Search className="h-4 w-4" />}查询
          </button>
        </form>
        <div className="mt-3 flex gap-1.5 flex-wrap">
          {STATUS_TABS.map(tab => (
            <button key={tab.key} onClick={() => setStatusFilter(tab.key)}
              className={`rounded-full px-3.5 py-1.5 text-xs font-medium transition-colors ${statusFilter === tab.key ? "bg-blue-600 text-white" : "bg-gray-100 text-gray-600 hover:bg-gray-200"}`}>
              {tab.label}
            </button>
          ))}
        </div>
      </div>

      {error && <div className="mb-4 rounded-lg border border-red-200 bg-red-50 px-4 py-3 text-sm text-red-700">{error}</div>}
      {loading && <div className="flex items-center justify-center py-20"><Loader2 className="h-8 w-8 animate-spin text-blue-500" /></div>}

      {/* 空态 */}
      {!loading && products.length === 0 && !error && (
        <div className="flex flex-col items-center justify-center py-20 text-gray-400">
          <QrCode className="mb-3 h-12 w-12" /><p>暂无产品数据</p>
        </div>
      )}

      {/* 🚀 分组折叠面板 */}
      {!loading && productGroups.length > 0 && (
        <div className="space-y-3">
          {productGroups.map(group => {
            const isOpen = expandedGroups.has(group.groupKey);
            return (
              <div key={group.groupKey} className="overflow-hidden rounded-xl bg-white shadow-sm">
                <button onClick={() => toggleGroup(group.groupKey)} className="flex w-full items-center gap-3 px-5 py-3.5 text-left hover:bg-gray-50 transition-colors">
                  {isOpen ? <ChevronDown className="h-4 w-4 shrink-0 text-gray-400" /> : <ChevronRight className="h-4 w-4 shrink-0 text-gray-400" />}
                  <Package className="h-4 w-4 shrink-0 text-blue-500" />
                  <div className="flex-1 min-w-0">
                    <div className="flex items-center gap-2">
                      <span className="text-sm font-semibold text-gray-800">
                        {group.groupKey === "未绑定订单" || group.groupKey === "未命名设备"
                          ? "📋 未分类"
                          : groupBy === "device" ? `⚙️ 设备: ${group.groupKey}` : `📦 订单: ${group.groupKey}`}
                      </span>
                      <span className="text-xs text-gray-400">{group.products.length} 个产品</span>
                    </div>
                  </div>
                  {group.allInWarehouse && group.products.length > 0 && (
                    <span className="inline-flex items-center gap-1 rounded-full bg-green-50 px-2.5 py-0.5 text-xs font-medium text-green-700"><Warehouse className="h-3 w-3" />已全部入库</span>
                  )}
                </button>

                {/* 产品卡片网格 */}
                {isOpen && (
                  <div className="border-t border-gray-100 px-5 py-4">
                    <div className="grid grid-cols-1 gap-4 sm:grid-cols-2 lg:grid-cols-3 xl:grid-cols-4">
                      {group.products.map(p => (
                        <div key={p.id} className="group relative flex flex-col rounded-xl bg-white shadow-sm ring-1 ring-gray-100 transition-shadow hover:shadow-md">
                          <div className="absolute top-2 right-2 flex gap-1 opacity-0 transition-opacity group-hover:opacity-100 z-10">
                            <button onClick={() => openEdit(p)} className="rounded-lg bg-white p-1.5 text-gray-400 shadow-sm hover:bg-blue-50 hover:text-blue-600"><Pencil className="h-3.5 w-3.5" /></button>
                            <button onClick={() => confirmDelete(p)} className="rounded-lg bg-white p-1.5 text-gray-400 shadow-sm hover:bg-red-50 hover:text-red-500"><Trash2 className="h-3.5 w-3.5" /></button>
                          </div>
                          <div className="flex flex-col items-center px-4 pt-5 pb-3">
                            <img src={`${QR_BASE}/${p.serial_number}`} alt={`QR-${p.serial_number}`} className="h-32 w-32 rounded-lg border border-gray-100" loading="lazy" />
                            <p className="mt-3 font-mono text-sm font-bold tracking-wider text-gray-800">{p.serial_number}</p>
                          </div>
                          <div className="flex-1 space-y-2 border-t border-gray-50 px-4 py-3">
                            <InfoRow icon={Package} label="物料名称" value={p.material_name || p.material_id || "—"} />
                            <InfoRow icon={Barcode} label="产品序列号" value={p.external_serial || "—"} />
                            <InfoRow icon={Hash} label="规格型号" value={p.spec_model || "—"} />
                            <InfoRow icon={Tag} label="订单编号" value={p.order_no || "—"} />
                            <InfoRow icon={MapPin} label="当前位置" value={p.current_location_name || p.current_location_id || "—"} />
                            <InfoRow icon={Clock} label="创建时间" value={new Date(p.created_at).toLocaleDateString("zh-CN")} />
                          </div>
                          <div className="border-t border-gray-50 px-4 py-3">
                            <button onClick={() => handleOpenPrint(p)} className="flex w-full items-center justify-center gap-1.5 rounded-lg border border-blue-200 bg-blue-50 py-2 text-xs font-medium text-blue-700 hover:bg-blue-100 hover:border-blue-300">
                              <Printer className="h-3.5 w-3.5" />打印标签
                            </button>
                          </div>
                        </div>
                      ))}
                    </div>
                  </div>
                )}
              </div>
            );
          })}
        </div>
      )}

      <CreateProductDialog open={showCreate} onClose={() => setShowCreate(false)} onCreated={loadProducts} />

      {/* 打印预览弹窗 */}
      {printTarget && (
        <div className="fixed inset-0 z-50 flex items-center justify-center">
          <div className="absolute inset-0 bg-black/40 backdrop-blur-sm" onClick={() => !printing && setPrintTarget(null)} />
          <div className="relative z-10 mx-4 w-full max-w-sm rounded-xl bg-white p-6 shadow-2xl">
            <div className="mb-4 flex items-center justify-between"><h3 className="text-base font-bold text-gray-800">标签打印预览</h3><button onClick={() => setPrintTarget(null)} disabled={printing} className="rounded-lg p-1 text-gray-400 hover:bg-gray-100 hover:text-gray-600"><X className="h-4 w-4" /></button></div>
            <div className="mb-4 flex justify-center">{printLoading || !previewUrl ? <div className="flex h-48 w-full items-center justify-center rounded-lg bg-gray-50"><Loader2 className="h-8 w-8 animate-spin text-blue-500" /></div> : <img src={previewUrl} alt="预览" className="max-h-64 rounded-lg border border-gray-200" />}</div>
            <p className="mb-4 text-center font-mono text-sm font-bold tracking-wider text-gray-700">{printTarget.serial_number}</p>
            <div className="mb-4 flex items-center justify-between"><span className="text-sm text-gray-600">打印份数</span><div className="flex items-center gap-2"><button onClick={() => setPrintCopies(c => Math.max(1, c - 1))} className="rounded border px-2.5 py-1 text-sm">−</button><span className="w-8 text-center text-sm font-semibold">{printCopies}</span><button onClick={() => setPrintCopies(c => Math.min(100, c + 1))} className="rounded border px-2.5 py-1 text-sm">+</button></div></div>
            <div className="flex justify-end gap-2"><button onClick={() => setPrintTarget(null)} disabled={printing} className="rounded-lg border px-4 py-2 text-sm text-gray-600">取消</button><button onClick={handleConfirmPrint} disabled={printing || printLoading} className="flex items-center gap-1.5 rounded-lg bg-blue-600 px-4 py-2 text-sm font-medium text-white">{printing && <Loader2 className="h-3.5 w-3.5 animate-spin" />}确认打印</button></div>
          </div>
        </div>
      )}

      {/* 编辑弹窗 */}
      {editTarget && (
        <div className="fixed inset-0 z-50 flex items-center justify-center">
          <div className="absolute inset-0 bg-black/40 backdrop-blur-sm" onClick={() => !editSaving && setEditTarget(null)} />
          <div className="relative z-10 mx-4 w-full max-w-sm rounded-xl bg-white p-6 shadow-2xl">
            <div className="mb-5 flex items-center justify-between"><h3 className="text-base font-bold text-gray-800">编辑产品</h3><button onClick={() => setEditTarget(null)} disabled={editSaving} className="rounded-lg p-1 text-gray-400 hover:bg-gray-100"><X className="h-4 w-4" /></button></div>
            <p className="mb-4 font-mono text-sm text-gray-500">产品ID: {editTarget.serial_number}</p>
            <div className="space-y-4">
              <div><label className="mb-1 block text-sm font-medium text-gray-700">订单编号</label><input value={editOrderNo} onChange={e => setEditOrderNo(e.target.value)} className="w-full rounded-lg border border-gray-200 px-3 py-2.5 text-sm focus:border-blue-400 focus:outline-none" /></div>
              <div><label className="mb-1 block text-sm font-medium text-gray-700">产品序列号</label><input value={editExternalSerial} onChange={e => setEditExternalSerial(e.target.value)} className="w-full rounded-lg border border-gray-200 px-3 py-2.5 text-sm focus:border-blue-400 focus:outline-none" /></div>
            </div>
            <div className="mt-6 flex justify-end gap-2"><button onClick={() => setEditTarget(null)} disabled={editSaving} className="rounded-lg border px-4 py-2 text-sm text-gray-600">取消</button><button onClick={handleSaveEdit} disabled={editSaving} className="flex items-center gap-1.5 rounded-lg bg-blue-600 px-4 py-2 text-sm font-medium text-white">{editSaving && <Loader2 className="h-3.5 w-3.5 animate-spin" />}<Save className="h-3.5 w-3.5" />保存</button></div>
          </div>
        </div>
      )}

      {/* 删除确认弹窗 */}
      {deleteTarget && (
        <div className="fixed inset-0 z-50 flex items-center justify-center">
          <div className="absolute inset-0 bg-black/40 backdrop-blur-sm" onClick={() => !deleting && setDeleteTarget(null)} />
          <div className="relative z-10 mx-4 w-full max-w-sm rounded-xl bg-white p-6 shadow-2xl">
            <div className="mb-4 flex items-center gap-3"><div className="flex h-10 w-10 shrink-0 items-center justify-center rounded-full bg-red-100"><AlertTriangle className="h-5 w-5 text-red-600" /></div><div><h3 className="text-base font-bold text-gray-800">危险操作</h3><p className="text-xs text-gray-500">删除产品及其全部关联数据</p></div></div>
            <p className="mb-4 text-sm text-gray-600">将永久删除 <span className="font-mono font-bold">{deleteTarget.serial_number}</span> 及其所有任务、记录和二维码。</p>
            <div className="mb-4"><label className="mb-1 block text-xs font-medium text-gray-600">请输入产品身份证以确认删除</label><input value={serialInput} onChange={e => setSerialInput(e.target.value)} placeholder={deleteTarget.serial_number} maxLength={16} className="w-full rounded-lg border border-gray-200 px-3 py-2 font-mono text-sm focus:border-red-400 focus:outline-none" disabled={deleting} /></div>
            <div className="flex items-center justify-end gap-2"><button onClick={() => setDeleteTarget(null)} disabled={deleting} className="rounded-lg border px-4 py-2 text-sm text-gray-600">取消</button><button onClick={handleDelete} disabled={!canConfirmDelete || deleting} className="flex items-center gap-1.5 rounded-lg bg-red-600 px-4 py-2 text-sm font-medium text-white disabled:cursor-not-allowed disabled:opacity-50">{deleting ? <><Loader2 className="h-3.5 w-3.5 animate-spin" />删除中...</> : canConfirmDelete ? <><Trash2 className="h-3.5 w-3.5" />确认删除</> : <>确认删除 ({countdown}s)</>}</button></div>
          </div>
        </div>
      )}
    </div>
  );
}

function InfoRow({ icon: Icon, label, value }: { icon: React.ComponentType<{ className?: string }>; label: string; value: string }) {
  return <div className="flex items-center gap-2 text-xs"><Icon className="h-3 w-3 shrink-0 text-gray-400" /><span className="shrink-0 text-gray-400">{label}</span><span className="truncate font-medium text-gray-700">{value}</span></div>;
}