"use client";

import * as React from "react";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";
import { Button } from "@/components/ui/button";
import { Label } from "@/components/ui/label";
import { Badge } from "@/components/ui/badge";
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
import { ScrollArea } from "@/components/ui/scroll-area";
import { Alert, AlertDescription } from "@/components/ui/alert";
import { Checkbox } from "@/components/ui/checkbox";
import { RadioGroup, RadioGroupItem } from "@/components/ui/radio-group";
import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
import { 
  Loader2, 
  X, 
  FileText, 
  Shield, 
  Globe, 
  Settings, 
  Link, 
  CheckCircle,
  Info,
  AlertCircle,
  Building2
} from "lucide-react";
import { cn } from "@/lib/utils";
import { toast } from "sonner";
import { getAvlVendorsForRfq, addAvlVendorsToRfq } from "../service";

interface AvlVendor {
  id: number;
  vendorId: number | null;
  vendorName: string;
  vendorCode: string | null;
  avlVendorName: string;
  tier: string | null;
  headquarterLocation: string | null;
  manufacturingLocation: string | null;
  materialGroupCode: string;
  materialGroupName: string | null;
  packageName: string | null;
  isAgent: boolean;
  hasAvl: boolean;
  isBlacklist: boolean;
  isBcc: boolean;
  remark: string | null;
}

interface VendorContract {
  vendorId: number;
  agreementYn: boolean;
  ndaYn: boolean;
  gtcType: "general" | "project" | "none";
}

interface AvlVendorDialogProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  rfqId: number;
  rfqCode?: string;
  onSuccess: () => void;
}

export function AvlVendorDialog({
  open,
  onOpenChange,
  rfqId,
  rfqCode,
  onSuccess,
}: AvlVendorDialogProps) {
  const [isLoading, setIsLoading] = React.useState(false);
  const [isLoadingAvl, setIsLoadingAvl] = React.useState(false);
  const [avlVendors, setAvlVendors] = React.useState<AvlVendor[]>([]);
  const [selectedVendorIds, setSelectedVendorIds] = React.useState<Set<number>>(new Set());
  const [activeTab, setActiveTab] = React.useState<"vendors" | "contracts">("vendors");
  const [vendorContracts, setVendorContracts] = React.useState<VendorContract[]>([]);
  const [existingVendorIds, setExistingVendorIds] = React.useState<Set<number>>(new Set());
  
  // 일괄 적용용 기본값
  const [defaultContract, setDefaultContract] = React.useState({
    agreementYn: true,
    ndaYn: true,
    gtcType: "none" as "general" | "project" | "none"
  });

  // AVL 벤더 로드
  const loadAvlVendors = React.useCallback(async () => {
    setIsLoadingAvl(true);
    try {
      const result = await getAvlVendorsForRfq(rfqId);
      if (result.success && result.vendors) {
        setAvlVendors(result.vendors);
        
        // 이미 RFQ에 추가된 벤더 ID 설정
        const existingIds = new Set(result.existingVendorIds || []);
        setExistingVendorIds(existingIds);
        
        // AVL에서 가져온 모든 벤더를 기본 선택 (이미 추가된 것 제외)
        const defaultSelected = new Set(
          result.vendors
            .filter(v => v.vendorId && !existingIds.has(v.vendorId))
            .map(v => v.vendorId!)
        );
        setSelectedVendorIds(defaultSelected);
        
        // 초기 계약 설정
        const initialContracts = result.vendors
          .filter(v => v.vendorId && defaultSelected.has(v.vendorId))
          .map(v => {
            const isInternational = v.headquarterLocation && 
              v.headquarterLocation !== "KR" && 
              v.headquarterLocation !== "한국";
            return {
              vendorId: v.vendorId!,
              agreementYn: true,
              ndaYn: true,
              gtcType: isInternational ? "general" : "none" as const
            };
          });
        setVendorContracts(initialContracts);
        
        if (result.vendors.length === 0) {
          toast.info("해당 프로젝트와 자재그룹에 대한 AVL 벤더가 없습니다.");
        }
      } else {
        toast.error(result.error || "AVL 데이터를 불러오는데 실패했습니다.");
      }
    } catch (error) {
      console.error("Failed to load AVL vendors:", error);
      toast.error("AVL 데이터를 불러오는데 실패했습니다.");
    } finally {
      setIsLoadingAvl(false);
    }
  }, [rfqId]);

  // 다이얼로그 열릴 때 데이터 로드
  React.useEffect(() => {
    if (open) {
      loadAvlVendors();
    }
  }, [open, loadAvlVendors]);

  // 초기화
  React.useEffect(() => {
    if (!open) {
      setAvlVendors([]);
      setSelectedVendorIds(new Set());
      setVendorContracts([]);
      setActiveTab("vendors");
      setDefaultContract({
        agreementYn: true,
        ndaYn: true,
        gtcType: "none"
      });
    }
  }, [open]);

  // 벤더 선택 토글
  const toggleVendorSelection = (vendorId: number) => {
    const newSelection = new Set(selectedVendorIds);
    if (newSelection.has(vendorId)) {
      newSelection.delete(vendorId);
      setVendorContracts(contracts => 
        contracts.filter(c => c.vendorId !== vendorId)
      );
    } else {
      newSelection.add(vendorId);
      const vendor = avlVendors.find(v => v.vendorId === vendorId);
      if (vendor) {
        const isInternational = vendor.headquarterLocation && 
          vendor.headquarterLocation !== "KR" && 
          vendor.headquarterLocation !== "한국";
        setVendorContracts(contracts => [
          ...contracts,
          {
            vendorId,
            agreementYn: defaultContract.agreementYn,
            ndaYn: defaultContract.ndaYn,
            gtcType: isInternational ? defaultContract.gtcType : "none"
          }
        ]);
      }
    }
    setSelectedVendorIds(newSelection);
  };

  // 개별 벤더의 계약 설정 업데이트
  const updateVendorContract = (vendorId: number, field: string, value: any) => {
    setVendorContracts(contracts =>
      contracts.map(c =>
        c.vendorId === vendorId ? { ...c, [field]: value } : c
      )
    );
  };

  // 모든 벤더에 일괄 적용
  const applyToAll = () => {
    setVendorContracts(contracts =>
      contracts.map(c => {
        const vendor = avlVendors.find(v => v.vendorId === c.vendorId);
        const isInternational = vendor?.headquarterLocation && 
          vendor.headquarterLocation !== "KR" && 
          vendor.headquarterLocation !== "한국";
        return {
          ...c,
          agreementYn: defaultContract.agreementYn,
          ndaYn: defaultContract.ndaYn,
          gtcType: isInternational ? defaultContract.gtcType : "none"
        };
      })
    );
    toast.success("모든 벤더에 기본계약 설정이 적용되었습니다.");
  };

  // 제출 처리
  const handleSubmit = async () => {
    if (selectedVendorIds.size === 0) {
      toast.error("최소 1개 이상의 벤더를 선택해주세요.");
      return;
    }

    setIsLoading(true);
    try {
      const selectedVendors = avlVendors.filter(v => 
        v.vendorId && selectedVendorIds.has(v.vendorId)
      );

      const result = await addAvlVendorsToRfq({
        rfqId,
        vendors: selectedVendors.map(v => ({
          vendorId: v.vendorId!,
          vendorName: v.vendorName,
          vendorCode: v.vendorCode,
          contractRequirements: vendorContracts.find(c => c.vendorId === v.vendorId) || {
            agreementYn: true,
            ndaYn: true,
            gtcType: "none" as const
          }
        }))
      });

      if (result.success) {
        toast.success(
          <div>
            <p>{result.addedCount}개의 AVL 벤더가 추가되었습니다.</p>
            {result.skippedCount && result.skippedCount > 0 && (
              <p className="text-sm text-muted-foreground mt-1">
                {result.skippedCount}개는 이미 추가되어 있어 건너뛰었습니다.
              </p>
            )}
          </div>
        );
        onSuccess();
        onOpenChange(false);
      } else {
        toast.error(result.error || "벤더 추가에 실패했습니다.");
      }
    } catch (error) {
      console.error("Submit error:", error);
      toast.error("오류가 발생했습니다.");
    } finally {
      setIsLoading(false);
    }
  };

  // 선택 가능한 벤더 필터링
  const selectableVendors = avlVendors.filter(v => v.vendorId);
  const selectedVendors = selectableVendors.filter(v => selectedVendorIds.has(v.vendorId!));

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="max-w-5xl max-h-[90vh] p-0 flex flex-col">
        <DialogHeader className="p-6 pb-0">
          <DialogTitle className="flex items-center gap-2">
            <Link className="h-5 w-5 text-primary" />
            AVL 벤더 연동
          </DialogTitle>
          <DialogDescription>
            프로젝트 AVL에 등록된 벤더를 RFQ에 추가합니다. 선택된 벤더에게 견적 요청을 발송할 수 있습니다.
          </DialogDescription>
        </DialogHeader>

        {isLoadingAvl ? (
          <div className="flex-1 flex items-center justify-center p-8">
            <Loader2 className="h-8 w-8 animate-spin text-muted-foreground" />
          </div>
        ) : (
          <Tabs value={activeTab} onValueChange={(v) => setActiveTab(v as any)} className="flex-1 flex flex-col min-h-0">
            <TabsList className="mx-6 grid w-fit grid-cols-2">
              <TabsTrigger value="vendors">
                1. AVL 벤더 선택
                {selectedVendorIds.size > 0 && (
                  <Badge variant="secondary" className="ml-2">
                    {selectedVendorIds.size}
                  </Badge>
                )}
              </TabsTrigger>
              <TabsTrigger value="contracts" disabled={selectedVendorIds.size === 0}>
                2. 기본계약 설정
              </TabsTrigger>
            </TabsList>

            <TabsContent value="vendors" className="flex-1 flex flex-col px-6 py-4 overflow-hidden min-h-0">
              {avlVendors.length === 0 ? (
                <Alert>
                  <AlertCircle className="h-4 w-4" />
                  <AlertDescription>
                    해당 프로젝트와 자재그룹에 대한 AVL 벤더가 없습니다.
                  </AlertDescription>
                </Alert>
              ) : (
                <Card className="flex flex-col flex-1 min-h-0">
                  <CardHeader>
                    <CardTitle className="text-lg flex items-center justify-between">
                      <span>AVL 벤더 목록</span>
                      <Badge variant="outline">
                        총 {avlVendors.length}개 업체
                      </Badge>
                    </CardTitle>
                    <CardDescription>
                      AVL에서 자동으로 가져온 벤더입니다. 필요한 벤더를 선택하세요.
                    </CardDescription>
                  </CardHeader>
                  <CardContent className="flex-1 min-h-0">
                    <ScrollArea className="h-[400px] pr-4">
                      <div className="space-y-2">
                        {avlVendors.map((vendor) => {
                          const isDisabled = !vendor.vendorId || existingVendorIds.has(vendor.vendorId);
                          const isSelected = vendor.vendorId && selectedVendorIds.has(vendor.vendorId);
                          const isInternational = vendor.headquarterLocation && 
                            vendor.headquarterLocation !== "KR" && 
                            vendor.headquarterLocation !== "한국";

                          return (
                            <div
                              key={vendor.id}
                              className={cn(
                                "flex items-center justify-between p-3 rounded-lg border",
                                isDisabled && "opacity-50 bg-muted/30",
                                isSelected && !isDisabled && "bg-primary/5 border-primary/30"
                              )}
                            >
                              <div className="flex items-center gap-3 flex-1">
                                <Checkbox
                                  checked={isSelected}
                                  onCheckedChange={() => vendor.vendorId && toggleVendorSelection(vendor.vendorId)}
                                  disabled={isDisabled}
                                />
                                
                                <div className="flex items-center gap-2 flex-1">
                                  <Building2 className="h-4 w-4 text-muted-foreground" />
                                  <div className="flex flex-col">
                                    <div className="flex items-center gap-2">
                                      <span className="font-medium">{vendor.vendorName}</span>
                                      {vendor.vendorCode && (
                                        <Badge variant="outline" className="text-xs">
                                          {vendor.vendorCode}
                                        </Badge>
                                      )}
                                      {existingVendorIds.has(vendor.vendorId!) && (
                                        <Badge variant="secondary" className="text-xs">
                                          <CheckCircle className="h-3 w-3 mr-1" />
                                          추가됨
                                        </Badge>
                                      )}
                                    </div>
                                    <div className="flex items-center gap-2 mt-1">
                                      {vendor.tier && (
                                        <Badge variant="outline" className="text-xs">
                                          등급: {vendor.tier}
                                        </Badge>
                                      )}
                                      {isInternational ? (
                                        <Badge variant="secondary" className="text-xs">
                                          <Globe className="h-3 w-3 mr-1" />
                                          {vendor.headquarterLocation}
                                        </Badge>
                                      ) : (
                                        <Badge variant="default" className="text-xs">
                                          국내
                                        </Badge>
                                      )}
                                      {vendor.materialGroupName && (
                                        <span className="text-xs text-muted-foreground">
                                          {vendor.materialGroupName}
                                        </span>
                                      )}
                                      {vendor.isAgent && (
                                        <Badge variant="warning" className="text-xs">
                                          Agent
                                        </Badge>
                                      )}
                                    </div>
                                  </div>
                                </div>

                                <div className="flex items-center gap-1">
                                  {vendor.hasAvl && (
                                    <Badge variant="success" className="text-xs">
                                      AVL
                                    </Badge>
                                  )}
                                  {vendor.isBcc && (
                                    <Badge variant="outline" className="text-xs">
                                      BCC
                                    </Badge>
                                  )}
                                  {vendor.isBlacklist && (
                                    <Badge variant="destructive" className="text-xs">
                                      Blacklist
                                    </Badge>
                                  )}
                                </div>
                              </div>
                            </div>
                          );
                        })}
                      </div>
                    </ScrollArea>
                  </CardContent>
                </Card>
              )}
            </TabsContent>

            <TabsContent value="contracts" className="flex-1 flex flex-col px-6 py-4 overflow-hidden min-h-0">
              <div className="flex-1 overflow-y-auto space-y-4 min-h-0">
                <Card>
                  <CardHeader className="pb-3">
                    <CardTitle className="text-base flex items-center gap-2">
                      <Settings className="h-4 w-4" />
                      일괄 적용 설정
                    </CardTitle>
                    <CardDescription>
                      모든 벤더에 동일한 설정을 적용할 수 있습니다.
                    </CardDescription>
                  </CardHeader>
                  <CardContent className="space-y-4">
                    <div className="grid grid-cols-2 gap-4">
                      <div className="space-y-2">
                        <div className="flex items-center space-x-2">
                          <Checkbox
                            id="default-agreement"
                            checked={defaultContract.agreementYn}
                            onCheckedChange={(checked) =>
                              setDefaultContract({ ...defaultContract, agreementYn: !!checked })
                            }
                          />
                          <label htmlFor="default-agreement" className="text-sm font-medium">
                            기술자료 제공 동의
                          </label>
                        </div>
                        <div className="flex items-center space-x-2">
                          <Checkbox
                            id="default-nda"
                            checked={defaultContract.ndaYn}
                            onCheckedChange={(checked) =>
                              setDefaultContract({ ...defaultContract, ndaYn: !!checked })
                            }
                          />
                          <label htmlFor="default-nda" className="text-sm font-medium">
                            비밀유지 계약 (NDA)
                          </label>
                        </div>
                      </div>
                      <div className="space-y-2">
                        <Label className="text-sm">GTC (국외 업체용)</Label>
                        <RadioGroup
                          value={defaultContract.gtcType}
                          onValueChange={(value: any) =>
                            setDefaultContract({ ...defaultContract, gtcType: value })
                          }
                        >
                          <div className="flex items-center space-x-2">
                            <RadioGroupItem value="none" id="default-gtc-none" />
                            <label htmlFor="default-gtc-none" className="text-sm">없음</label>
                          </div>
                          <div className="flex items-center space-x-2">
                            <RadioGroupItem value="general" id="default-gtc-general" />
                            <label htmlFor="default-gtc-general" className="text-sm">General GTC</label>
                          </div>
                          <div className="flex items-center space-x-2">
                            <RadioGroupItem value="project" id="default-gtc-project" />
                            <label htmlFor="default-gtc-project" className="text-sm">Project GTC</label>
                          </div>
                        </RadioGroup>
                      </div>
                    </div>
                    <Button
                      variant="secondary"
                      size="sm"
                      onClick={applyToAll}
                      className="w-full"
                    >
                      모든 벤더에 적용
                    </Button>
                  </CardContent>
                </Card>

                <Card className="flex flex-col min-h-0">
                  <CardHeader className="pb-3">
                    <CardTitle className="text-base">개별 벤더 기본계약 설정</CardTitle>
                    <CardDescription>
                      각 벤더별로 다른 기본계약을 요구할 수 있습니다.
                    </CardDescription>
                  </CardHeader>
                  <CardContent className="flex-1 min-h-0">
                    <ScrollArea className="h-[250px] pr-4">
                      <div className="space-y-4">
                        {selectedVendors.map((vendor) => {
                          const contract = vendorContracts.find(c => c.vendorId === vendor.vendorId);
                          const isInternational = vendor.headquarterLocation && 
                            vendor.headquarterLocation !== "KR" && 
                            vendor.headquarterLocation !== "한국";

                          return (
                            <div key={vendor.id} className="border rounded-lg p-4 space-y-3">
                              <div className="flex items-center justify-between">
                                <div className="flex items-center gap-2">
                                  {vendor.vendorCode && (
                                    <Badge variant="outline">{vendor.vendorCode}</Badge>
                                  )}
                                  <span className="font-medium">{vendor.vendorName}</span>
                                  <Badge
                                    variant={isInternational ? "secondary" : "default"}
                                    className="text-xs"
                                  >
                                    {vendor.headquarterLocation || "미지정"}
                                  </Badge>
                                </div>
                              </div>

                              <div className="grid grid-cols-2 gap-4">
                                <div className="space-y-2">
                                  <div className="flex items-center space-x-2">
                                    <Checkbox
                                      checked={contract?.agreementYn || false}
                                      onCheckedChange={(checked) =>
                                        vendor.vendorId && updateVendorContract(vendor.vendorId, "agreementYn", !!checked)
                                      }
                                    />
                                    <label className="text-sm">기술자료 제공</label>
                                  </div>
                                  <div className="flex items-center space-x-2">
                                    <Checkbox
                                      checked={contract?.ndaYn || false}
                                      onCheckedChange={(checked) =>
                                        vendor.vendorId && updateVendorContract(vendor.vendorId, "ndaYn", !!checked)
                                      }
                                    />
                                    <label className="text-sm">NDA</label>
                                  </div>
                                </div>

                                {isInternational && vendor.vendorId && (
                                  <div className="space-y-1">
                                    <Label className="text-xs">GTC</Label>
                                    <RadioGroup
                                      value={contract?.gtcType || "none"}
                                      onValueChange={(value) =>
                                        updateVendorContract(vendor.vendorId!, "gtcType", value)
                                      }
                                    >
                                      <div className="flex items-center space-x-2">
                                        <RadioGroupItem value="none" id={`${vendor.vendorId}-none`} />
                                        <label htmlFor={`${vendor.vendorId}-none`} className="text-xs">없음</label>
                                      </div>
                                      <div className="flex items-center space-x-2">
                                        <RadioGroupItem value="general" id={`${vendor.vendorId}-general`} />
                                        <label htmlFor={`${vendor.vendorId}-general`} className="text-xs">General</label>
                                      </div>
                                      <div className="flex items-center space-x-2">
                                        <RadioGroupItem value="project" id={`${vendor.vendorId}-project`} />
                                        <label htmlFor={`${vendor.vendorId}-project`} className="text-xs">Project</label>
                                      </div>
                                    </RadioGroup>
                                  </div>
                                )}

                                {!isInternational && (
                                  <div className="text-xs text-muted-foreground">
                                    국내 업체 - GTC 불필요
                                  </div>
                                )}
                              </div>
                            </div>
                          );
                        })}
                      </div>
                    </ScrollArea>
                  </CardContent>
                </Card>
              </div>
            </TabsContent>
          </Tabs>
        )}

        <DialogFooter className="p-6 pt-0 border-t">
          <Button
            variant="outline"
            onClick={() => onOpenChange(false)}
            disabled={isLoading}
          >
            취소
          </Button>
          {activeTab === "vendors" && selectedVendorIds.size > 0 && (
            <Button onClick={() => setActiveTab("contracts")}>
              다음: 기본계약 설정
            </Button>
          )}
          {activeTab === "contracts" && (
            <Button
              onClick={handleSubmit}
              disabled={isLoading || selectedVendorIds.size === 0}
            >
              {isLoading && <Loader2 className="mr-2 h-4 w-4 animate-spin" />}
              {selectedVendorIds.size > 0
                ? `${selectedVendorIds.size}개 AVL 벤더 추가`
                : 'AVL 벤더 추가'
              }
            </Button>
          )}
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}