"use client";

/**
 * 수주 수정 컴포넌트 (Edit Mode)
 * IntegratedDetailTemplate 마이그레이션 완료 (2026-01-20)
 *
 * - 기본 정보 (읽기전용)
 * - 수주/배송 정보 (편집 가능)
 * - 비고 (편집 가능)
 * - 품목 내역 (생산 시작 후 수정 불가)
 */

import { useState, useEffect, useMemo, useCallback } from "react";
import { useRouter } from "next/navigation";
import { Input } from "@/components/ui/input";
import { Textarea } from "@/components/ui/textarea";
import { PhoneInput } from "@/components/ui/phone-input";
import { Checkbox } from "@/components/ui/checkbox";
import { Label } from "@/components/ui/label";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table";
import { AlertTriangle, ChevronDown, ChevronRight, ChevronsUpDown, Package } from "lucide-react";
import { toast } from "sonner";
import { IntegratedDetailTemplate } from "@/components/templates/IntegratedDetailTemplate";
import { orderSalesConfig } from "./orderSalesConfig";
import { BadgeSm } from "@/components/atoms/BadgeSm";
import { formatAmount } from "@/utils/formatAmount";
import {
  OrderItem,
  getOrderById,
  updateOrder,
  type OrderStatus,
} from "@/components/orders";
import { getDeliveryMethodOptions, getCommonCodeOptions } from "@/lib/api/common-codes";

// 수정 폼 데이터
interface EditFormData {
  // 읽기전용 정보
  lotNumber: string;
  orderDate: string;  // 접수일
  quoteNumber: string;
  client: string;
  siteName: string;
  manager: string;
  contact: string;
  status: OrderStatus;

  // 수정 가능 정보
  expectedShipDate: string;
  expectedShipDateUndecided: boolean;
  deliveryRequestDate: string;
  deliveryMethod: string;
  shippingCost: string;
  receiver: string;
  receiverContact: string;
  address: string;
  addressDetail: string;
  remarks: string;

  // 품목 (수정 제한)
  items: OrderItem[];
  canEditItems: boolean;
  subtotal: number;
  discountRate: number;
  totalAmount: number;
  // 제품 정보 (아코디언용)
  products: Array<{
    productName: string;
    productCategory?: string;
    openWidth?: string;
    openHeight?: string;
    quantity: number;
    floor?: string;
    code?: string;
  }>;
}

// 옵션 타입 정의
interface SelectOption {
  value: string;
  label: string;
}


// 상태 뱃지 헬퍼
function getOrderStatusBadge(status: OrderStatus) {
  const statusConfig: Record<OrderStatus, { label: string; className: string }> = {
    order_registered: { label: "수주등록", className: "bg-gray-100 text-gray-700 border-gray-200" },
    order_confirmed: { label: "수주확정", className: "bg-gray-100 text-gray-700 border-gray-200" },
    production_ordered: { label: "생산지시완료", className: "bg-blue-100 text-blue-700 border-blue-200" },
    in_production: { label: "생산중", className: "bg-green-100 text-green-700 border-green-200" },
    produced: { label: "생산완료", className: "bg-blue-100 text-blue-700 border-blue-200" },
    rework: { label: "재작업중", className: "bg-orange-100 text-orange-700 border-orange-200" },
    work_completed: { label: "작업완료", className: "bg-blue-600 text-white border-blue-600" },
    shipping: { label: "출하중", className: "bg-purple-100 text-purple-700 border-purple-200" },
    shipped: { label: "출하완료", className: "bg-gray-500 text-white border-gray-500" },
    completed: { label: "완료", className: "bg-gray-500 text-white border-gray-500" },
    cancelled: { label: "취소", className: "bg-red-100 text-red-700 border-red-200" },
  };
  const config = statusConfig[status] || { label: status, className: "bg-gray-100 text-gray-700 border-gray-200" };
  return (
    <BadgeSm className={config.className}>
      {config.label}
    </BadgeSm>
  );
}

interface OrderSalesDetailEditProps {
  orderId: string;
}

export function OrderSalesDetailEdit({ orderId }: OrderSalesDetailEditProps) {
  const router = useRouter();

  const [form, setForm] = useState<EditFormData | null>(null);
  const [loading, setLoading] = useState(true);
  const [isSaving, setIsSaving] = useState(false);
  const [expandedProducts, setExpandedProducts] = useState<Set<string>>(new Set());

  // 공통코드 옵션
  const [deliveryMethods, setDeliveryMethods] = useState<SelectOption[]>([]);
  const [shippingCosts, setShippingCosts] = useState<SelectOption[]>([]);

  // 제품-부품 트리 토글
  const toggleProduct = (key: string) => {
    setExpandedProducts((prev) => {
      const next = new Set(prev);
      if (next.has(key)) {
        next.delete(key);
      } else {
        next.add(key);
      }
      return next;
    });
  };

  // 모든 제품 확장
  const expandAllProducts = () => {
    if (form?.products) {
      const allKeys = form.products.map((p) => `${p.floor || ""}-${p.code || ""}`);
      allKeys.push("other-parts"); // 기타부품도 포함
      setExpandedProducts(new Set(allKeys));
    }
  };

  // 모든 제품 축소
  const collapseAllProducts = () => {
    setExpandedProducts(new Set());
  };

  // 제품별로 부품 그룹화 (floor_code, symbol_code 매칭)
  const getItemsForProduct = (floor: string | undefined, code: string | undefined) => {
    if (!form?.items) return [];
    return form.items.filter((item) => {
      const itemFloor = item.type || "";
      const itemSymbol = item.symbol || "";
      const productFloor = floor || "";
      const productCode = code || "";
      return itemFloor === productFloor && itemSymbol === productCode;
    });
  };

  // 매칭되지 않은 부품 (orphan items)
  const getUnmatchedItems = () => {
    if (!form?.items || !form?.products) return form?.items || [];
    const matchedIds = new Set<string>();
    form.products.forEach((product) => {
      const items = getItemsForProduct(product.floor, product.code);
      items.forEach((item) => matchedIds.add(item.id));
    });
    return form.items.filter((item) => !matchedIds.has(item.id));
  };

  /**
   * 수량 포맷 함수
   * - EA, SET, PCS 등 개수 단위: 정수로 표시
   * - M, M2, KG, L 등 측정 단위: 소수점 이하 불필요한 0 제거
   */
  const formatQuantity = (quantity: number, unit?: string): string => {
    const countableUnits = ["EA", "SET", "PCS", "개", "세트", "BOX", "ROLL"];
    const upperUnit = (unit || "").toUpperCase();

    if (countableUnits.includes(upperUnit)) {
      return Math.round(quantity).toLocaleString();
    }

    const rounded = Math.round(quantity * 10000) / 10000;
    return rounded.toLocaleString(undefined, {
      minimumFractionDigits: 0,
      maximumFractionDigits: 4
    });
  };

  // 데이터 로드 (API)
  useEffect(() => {
    async function loadOrder() {
      try {
        setLoading(true);
        const result = await getOrderById(orderId);
        if (result.success && result.data) {
          const order = result.data;
          // 상태에 따라 품목 수정 가능 여부 결정
          const canEditItems = !["in_production", "rework", "work_completed", "shipped"].includes(
            order.status
          );
          // Order 데이터를 EditFormData로 변환
          setForm({
            lotNumber: order.lotNumber,
            orderDate: order.orderDate || "",
            quoteNumber: order.quoteNumber || "",
            client: order.client,
            siteName: order.siteName,
            manager: order.manager || "",
            contact: order.contact || "",
            status: order.status,
            expectedShipDate: order.expectedShipDate || "",
            expectedShipDateUndecided: !order.expectedShipDate,
            deliveryRequestDate: order.deliveryRequestDate || "",
            deliveryMethod: order.deliveryMethod || "",
            shippingCost: order.shippingCost || "",
            receiver: order.receiver || "",
            receiverContact: order.receiverContact || "",
            address: order.address || "",
            addressDetail: order.addressDetail || "",
            remarks: order.remarks || "",
            items: order.items || [],
            canEditItems,
            subtotal: order.subtotal || order.amount,
            discountRate: order.discountRate || 0,
            totalAmount: order.amount,
            products: order.products || [],
          });
        } else {
          toast.error(result.error || "수주 정보를 불러오는데 실패했습니다.");
          router.push("/sales/order-management-sales");
        }
      } catch (error) {
        console.error("Error loading order:", error);
        toast.error("수주 정보를 불러오는 중 오류가 발생했습니다.");
        router.push("/sales/order-management-sales");
      } finally {
        setLoading(false);
      }
    }
    loadOrder();
  }, [orderId, router]);

  // 공통코드 옵션 로드
  useEffect(() => {
    async function loadCommonCodes() {
      const [deliveryResult, shippingResult] = await Promise.all([
        getDeliveryMethodOptions(),
        getCommonCodeOptions('shipping_cost'),
      ]);

      if (deliveryResult.success && deliveryResult.data) {
        setDeliveryMethods(deliveryResult.data);
      }
      if (shippingResult.success && shippingResult.data) {
        setShippingCosts(shippingResult.data);
      }
    }
    loadCommonCodes();
  }, []);

  const handleCancel = () => {
    // V2 패턴: ?mode=view로 이동
    router.push(`/sales/order-management-sales/${orderId}?mode=view`);
  };

  // IntegratedDetailTemplate용 onSubmit 핸들러
  const handleSubmit = useCallback(async (): Promise<{ success: boolean; error?: string }> => {
    if (!form) return { success: false, error: "폼 데이터가 없습니다." };

    // 유효성 검사
    if (!form.deliveryRequestDate) {
      return { success: false, error: "납품요청일을 입력해주세요." };
    }
    if (!form.receiver.trim()) {
      return { success: false, error: "수신자를 입력해주세요." };
    }
    if (!form.receiverContact.trim()) {
      return { success: false, error: "수신처를 입력해주세요." };
    }

    try {
      // API 연동
      const result = await updateOrder(orderId, {
        clientId: undefined, // 기존 값 유지
        siteName: form.siteName,
        expectedShipDate: form.expectedShipDateUndecided ? undefined : form.expectedShipDate,
        deliveryRequestDate: form.deliveryRequestDate,
        deliveryMethod: form.deliveryMethod,
        shippingCost: form.shippingCost,
        receiver: form.receiver,
        receiverContact: form.receiverContact,
        address: form.address,
        addressDetail: form.addressDetail,
        remarks: form.remarks,
        items: form.items.map((item) => ({
          itemId: item.id ? parseInt(item.id, 10) : undefined,
          itemCode: item.itemCode,
          itemName: item.itemName,
          specification: item.spec,
          quantity: item.quantity,
          unit: item.unit,
          unitPrice: item.unitPrice,
        })),
      });

      if (result.success) {
        toast.success("수주가 수정되었습니다.");
        // V2 패턴: 저장 후 view 모드로 이동
        router.push(`/sales/order-management-sales/${orderId}?mode=view`);
        return { success: true };
      } else {
        return { success: false, error: result.error || "수주 수정에 실패했습니다." };
      }
    } catch (error) {
      console.error("Error updating order:", error);
      return { success: false, error: "수주 수정 중 오류가 발생했습니다." };
    }
  }, [form, orderId, router]);

  // 동적 config (수정 모드용 타이틀)
  const dynamicConfig = useMemo(() => {
    return {
      ...orderSalesConfig,
      title: "수주",
      actions: {
        ...orderSalesConfig.actions,
        showEdit: false, // 수정 모드에서는 수정 버튼 숨김
        showDelete: false,
      },
    };
  }, []);

  // 커스텀 헤더 액션 (상태 뱃지)
  const customHeaderActions = useMemo(() => {
    if (!form) return null;
    return (
      <div className="flex items-center gap-2">
        <code className="text-sm font-mono bg-gray-100 px-2 py-1 rounded">
          {form.lotNumber}
        </code>
        {getOrderStatusBadge(form.status)}
      </div>
    );
  }, [form]);

  // 폼 콘텐츠 렌더링
  const renderFormContent = useCallback(() => {
    if (!form) return null;

    return (
      <div className="space-y-6">
        {/* 기본 정보 (읽기전용) */}
        <Card>
          <CardHeader>
            <CardTitle className="text-lg flex items-center gap-2">
              기본 정보
              <span className="text-sm font-normal text-muted-foreground">(읽기전용)</span>
            </CardTitle>
          </CardHeader>
          <CardContent>
            <div className="grid grid-cols-2 md:grid-cols-4 gap-4">
              <div className="space-y-1">
                <Label className="text-muted-foreground text-sm">로트번호</Label>
                <p className="font-medium">{form.lotNumber}</p>
              </div>
              <div className="space-y-1">
                <Label className="text-muted-foreground text-sm">접수일</Label>
                <p className="font-medium">{form.orderDate || "-"}</p>
              </div>
              <div className="space-y-1">
                <Label className="text-muted-foreground text-sm">수주처</Label>
                <p className="font-medium">{form.client}</p>
              </div>
              <div className="space-y-1">
                <Label className="text-muted-foreground text-sm">현장명</Label>
                <p className="font-medium">{form.siteName}</p>
              </div>
              <div className="space-y-1">
                <Label className="text-muted-foreground text-sm">담당자</Label>
                <p className="font-medium">{form.manager || "-"}</p>
              </div>
              <div className="space-y-1">
                <Label className="text-muted-foreground text-sm">연락처</Label>
                <p className="font-medium">{form.contact || "-"}</p>
              </div>
              <div className="space-y-1">
                <Label className="text-muted-foreground text-sm">상태</Label>
                <div className="mt-1">{getOrderStatusBadge(form.status)}</div>
              </div>
            </div>
          </CardContent>
        </Card>

        {/* 수주/배송 정보 (편집 가능) */}
        <Card>
          <CardHeader>
            <CardTitle className="text-lg">수주/배송 정보</CardTitle>
          </CardHeader>
          <CardContent>
            <div className="grid grid-cols-1 md:grid-cols-4 gap-4">
              {/* 첫 번째 줄: 수주일, 납품요청일, 출고예정일, 배송방식 */}
              <div className="space-y-2">
                <Label className="text-muted-foreground">수주일</Label>
                <Input
                  value={form.orderDate || ""}
                  disabled
                  className="bg-muted"
                />
              </div>

              <div className="space-y-2">
                <Label>
                  납품요청일 <span className="text-red-500">*</span>
                </Label>
                <Input
                  type="date"
                  value={form.deliveryRequestDate}
                  onChange={(e) =>
                    setForm({ ...form, deliveryRequestDate: e.target.value })
                  }
                />
              </div>

              <div className="space-y-2">
                <Label>출고예정일</Label>
                <Input
                  type="date"
                  value={form.expectedShipDate}
                  onChange={(e) =>
                    setForm({ ...form, expectedShipDate: e.target.value })
                  }
                  disabled={form.expectedShipDateUndecided}
                />
              </div>

              <div className="space-y-2">
                <Label>배송방식</Label>
                <Select
                  key={`deliveryMethod-${form.deliveryMethod}`}
                  value={form.deliveryMethod}
                  onValueChange={(value) =>
                    setForm({ ...form, deliveryMethod: value })
                  }
                >
                  <SelectTrigger>
                    <SelectValue placeholder="선택" />
                  </SelectTrigger>
                  <SelectContent>
                    {deliveryMethods.map((method) => (
                      <SelectItem key={method.value} value={method.value}>
                        {method.label}
                      </SelectItem>
                    ))}
                  </SelectContent>
                </Select>
              </div>

              {/* 두 번째 줄: 운임비용, 수신자, 수신처 */}
              <div className="space-y-2">
                <Label>운임비용</Label>
                <Select
                  key={`shippingCost-${form.shippingCost}`}
                  value={form.shippingCost}
                  onValueChange={(value) =>
                    setForm({ ...form, shippingCost: value })
                  }
                >
                  <SelectTrigger>
                    <SelectValue placeholder="선택" />
                  </SelectTrigger>
                  <SelectContent>
                    {shippingCosts.map((cost) => (
                      <SelectItem key={cost.value} value={cost.value}>
                        {cost.label}
                      </SelectItem>
                    ))}
                  </SelectContent>
                </Select>
              </div>

              <div className="space-y-2">
                <Label>
                  수신자 <span className="text-red-500">*</span>
                </Label>
                <Input
                  value={form.receiver}
                  onChange={(e) =>
                    setForm({ ...form, receiver: e.target.value })
                  }
                  placeholder="수신자명 입력"
                />
              </div>

              <div className="space-y-2">
                <Label>
                  수신처 <span className="text-red-500">*</span>
                </Label>
                <Input
                  value={form.receiverContact}
                  onChange={(e) =>
                    setForm({ ...form, receiverContact: e.target.value })
                  }
                  placeholder="수신처 입력"
                />
              </div>

              {/* 주소 - 전체 너비 */}
              <div className="space-y-2 md:col-span-4">
                <Label>주소</Label>
                <div className="flex gap-2">
                  <Input
                    value={form.address}
                    onChange={(e) =>
                      setForm({ ...form, address: e.target.value })
                    }
                    placeholder="주소"
                    className="flex-1"
                  />
                </div>
              </div>
            </div>
          </CardContent>
        </Card>

        {/* 비고 */}
        <Card>
          <CardHeader>
            <CardTitle className="text-lg">비고</CardTitle>
          </CardHeader>
          <CardContent>
            <Textarea
              value={form.remarks}
              onChange={(e) => setForm({ ...form, remarks: e.target.value })}
              placeholder="특이사항을 입력하세요"
              rows={4}
            />
          </CardContent>
        </Card>

        {/* 제품내용 (아코디언) */}
        <Card>
          <CardHeader>
            <div className="flex items-center justify-between">
              <CardTitle className="text-lg flex items-center gap-2">
                제품내용
                {!form.canEditItems && (
                  <span className="flex items-center gap-1 text-sm font-normal text-orange-600">
                    <AlertTriangle className="h-4 w-4" />
                    생산 시작 후 수정 불가
                  </span>
                )}
              </CardTitle>
              {form.products && form.products.length > 0 && (
                <div className="flex items-center gap-2">
                  <button
                    type="button"
                    onClick={expandAllProducts}
                    className="text-xs text-gray-500 hover:text-gray-700 flex items-center gap-1"
                  >
                    <ChevronsUpDown className="h-3 w-3" />
                    모두 펼치기
                  </button>
                  <button
                    type="button"
                    onClick={collapseAllProducts}
                    className="text-xs text-gray-500 hover:text-gray-700"
                  >
                    모두 접기
                  </button>
                </div>
              )}
            </div>
          </CardHeader>
          <CardContent>
            {form.products && form.products.length > 0 ? (
              <div className="space-y-3">
                {form.products.map((product, productIndex) => {
                  const productKey = `${product.floor || ""}-${product.code || ""}`;
                  const isExpanded = expandedProducts.has(productKey);
                  const productItems = getItemsForProduct(product.floor, product.code);

                  return (
                    <div
                      key={productIndex}
                      className="border border-gray-200 rounded-lg overflow-hidden"
                    >
                      {/* 제품 헤더 (클릭하면 확장/축소) */}
                      <button
                        type="button"
                        onClick={() => toggleProduct(productKey)}
                        className="w-full flex items-center justify-between p-4 bg-gray-50 hover:bg-gray-100 transition-colors text-left"
                      >
                        <div className="flex items-center gap-3">
                          {isExpanded ? (
                            <ChevronDown className="h-5 w-5 text-gray-500" />
                          ) : (
                            <ChevronRight className="h-5 w-5 text-gray-500" />
                          )}
                          <Package className="h-5 w-5 text-blue-600" />
                          <div>
                            <span className="font-medium">{product.productName}</span>
                            {product.openWidth && product.openHeight && (
                              <span className="ml-2 text-sm text-gray-500">
                                ({product.openWidth} × {product.openHeight})
                              </span>
                            )}
                          </div>
                        </div>
                        <span className="text-sm text-gray-500">
                          {productItems.length}개 부품
                        </span>
                      </button>

                      {/* 부품 목록 (확장 시 표시) */}
                      {isExpanded && (
                        <div className="border-t">
                          {productItems.length > 0 ? (
                            <Table>
                              <TableHeader>
                                <TableRow>
                                  <TableHead className="w-[60px] text-center">순번</TableHead>
                                  <TableHead>품목명</TableHead>
                                  <TableHead>규격</TableHead>
                                  <TableHead className="text-center">수량</TableHead>
                                  <TableHead className="text-center">단위</TableHead>
                                </TableRow>
                              </TableHeader>
                              <TableBody>
                                {productItems.map((item, index) => (
                                  <TableRow key={item.id}>
                                    <TableCell className="text-center">{index + 1}</TableCell>
                                    <TableCell>{item.itemName}</TableCell>
                                    <TableCell>{item.spec || "-"}</TableCell>
                                    <TableCell className="text-center">{formatQuantity(item.quantity, item.unit)}</TableCell>
                                    <TableCell className="text-center">{item.unit || "-"}</TableCell>
                                  </TableRow>
                                ))}
                              </TableBody>
                            </Table>
                          ) : (
                            <div className="p-4 text-center text-gray-400 text-sm">
                              연결된 부품이 없습니다
                            </div>
                          )}
                        </div>
                      )}
                    </div>
                  );
                })}
              </div>
            ) : null}
          </CardContent>
        </Card>

        {/* 기타부품 (아코디언) */}
        {(() => {
          const unmatchedItems = getUnmatchedItems();
          if (unmatchedItems.length === 0) return null;
          return (
            <Card>
              <CardHeader>
                <CardTitle className="text-lg">기타부품</CardTitle>
              </CardHeader>
              <CardContent>
                <div className="border border-gray-200 rounded-lg overflow-hidden">
                  <button
                    type="button"
                    onClick={() => toggleProduct("other-parts")}
                    className="w-full flex items-center justify-between p-4 bg-gray-50 hover:bg-gray-100 transition-colors text-left"
                  >
                    <div className="flex items-center gap-3">
                      {expandedProducts.has("other-parts") ? (
                        <ChevronDown className="h-5 w-5 text-gray-500" />
                      ) : (
                        <ChevronRight className="h-5 w-5 text-gray-500" />
                      )}
                      <Package className="h-5 w-5 text-gray-400" />
                      <span className="font-medium text-gray-600">기타부품</span>
                    </div>
                    <span className="text-sm text-gray-500">
                      {unmatchedItems.length}개
                    </span>
                  </button>
                  {expandedProducts.has("other-parts") && (
                    <div className="border-t">
                      <Table>
                        <TableHeader>
                          <TableRow>
                            <TableHead className="w-[60px] text-center">순번</TableHead>
                            <TableHead>품목명</TableHead>
                            <TableHead>규격</TableHead>
                            <TableHead className="text-center">수량</TableHead>
                            <TableHead className="text-center">단위</TableHead>
                          </TableRow>
                        </TableHeader>
                        <TableBody>
                          {unmatchedItems.map((item, index) => (
                            <TableRow key={item.id}>
                              <TableCell className="text-center">{index + 1}</TableCell>
                              <TableCell>{item.itemName}</TableCell>
                              <TableCell>{item.spec || "-"}</TableCell>
                              <TableCell className="text-center">{formatQuantity(item.quantity, item.unit)}</TableCell>
                              <TableCell className="text-center">{item.unit || "-"}</TableCell>
                            </TableRow>
                          ))}
                        </TableBody>
                      </Table>
                    </div>
                  )}
                </div>
              </CardContent>
            </Card>
          );
        })()}

      </div>
    );
  }, [form]);

  return (
    <IntegratedDetailTemplate
      config={dynamicConfig}
      mode="edit"
      initialData={form || {}}
      itemId={orderId}
      isLoading={loading}
      headerActions={customHeaderActions}
      onSubmit={handleSubmit}
      renderView={() => renderFormContent()}
      renderForm={() => renderFormContent()}
    />
  );
}