"use client";

import * as React from "react";
import { useForm } from "react-hook-form";
import { zodResolver } from "@hookform/resolvers/zod";
import * as z from "zod";
import { Button } from "@/components/ui/button";
import {
  Sheet,
  SheetContent,
  SheetDescription,
  SheetFooter,
  SheetHeader,
  SheetTitle,
  SheetTrigger,
} from "@/components/ui/sheet";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";
import {
  Form,
  FormControl,
  FormDescription,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from "@/components/ui/form";
import { Input } from "@/components/ui/input";
import { Badge } from "@/components/ui/badge";
import { Textarea } from "@/components/ui/textarea";
import { Checkbox } from "@/components/ui/checkbox";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import { Edit, Plus, Trash2 } from "lucide-react";
import { 
  updateComplianceQuestion,
  getComplianceQuestionOptions,
  createComplianceQuestionOption,
  deleteComplianceQuestionOption,
  getSelectableParentQuestions,
} from "@/lib/compliance/services";
import { QUESTION_TYPES } from "@/db/schema/compliance";
import { toast } from "sonner";
import { useRouter } from "next/navigation";
import { complianceQuestions } from "@/db/schema/compliance";

const questionSchema = z.object({
  questionNumber: z.string().min(1, "질문 번호를 입력하세요"),
  questionText: z.string().min(1, "질문 내용을 입력하세요"),
  questionType: z.string().min(1, "질문 유형을 선택하세요"),
  isRequired: z.boolean(),
  hasDetailText: z.boolean(),
  hasFileUpload: z.boolean(),
  isConditional: z.boolean(),
  parentQuestionId: z.number().optional(),
  conditionalValue: z.string().optional(),
});

type QuestionFormData = z.infer<typeof questionSchema>;

interface ComplianceQuestionEditDialogProps {
  question: typeof complianceQuestions.$inferSelect;
  onSuccess?: () => void;
}

export function ComplianceQuestionEditSheet({ 
  question, 
  onSuccess 
}: ComplianceQuestionEditDialogProps) {
  const [open, setOpen] = React.useState(false);
  const [isLoading, setIsLoading] = React.useState(false);
  const router = useRouter();
  const [options, setOptions] = React.useState<Array<{ id: number; optionValue: string; optionText: string; allowsOtherInput: boolean; displayOrder: number }>>([]);
  const [newOptionValue, setNewOptionValue] = React.useState("");
  const [newOptionText, setNewOptionText] = React.useState("");
  const [newOptionOther, setNewOptionOther] = React.useState(false);
  const [parentOptions, setParentOptions] = React.useState<Array<{ id: number; optionValue: string; optionText: string }>>([]);
  const [selectableParents, setSelectableParents] = React.useState<Array<{ id: number; questionNumber: string; questionText: string; questionType: string }>>([]);
  const [parentQuestionId, setParentQuestionId] = React.useState<number | null>(question.parentQuestionId || null);
  const [showOptionForm, setShowOptionForm] = React.useState(false);
  const [showOptionsDeleteDialog, setShowOptionsDeleteDialog] = React.useState(false);
  const [pendingQuestionTypeChange, setPendingQuestionTypeChange] = React.useState<string | null>(null);

  const form = useForm<QuestionFormData>({
    resolver: zodResolver(questionSchema),
    defaultValues: {
      questionNumber: question.questionNumber,
      questionText: question.questionText,
      questionType: question.questionType,
      isRequired: question.isRequired,
      hasDetailText: question.hasDetailText,
      hasFileUpload: question.hasFileUpload,
      isConditional: !!question.parentQuestionId,
      parentQuestionId: question.parentQuestionId || undefined,
      conditionalValue: question.conditionalValue || "",
    },
  });

  const isSelectionType = React.useMemo(() => {
    return [QUESTION_TYPES.RADIO, QUESTION_TYPES.CHECKBOX, QUESTION_TYPES.DROPDOWN].includes((form.getValues("questionType") || "").toUpperCase() as any);
  }, [form]);

  const loadOptions = React.useCallback(async () => {
    if (!isSelectionType) return;
    try {
      const data = await getComplianceQuestionOptions(question.id);
      setOptions(data);
    } catch (e) {
      console.error("loadOptions error", e);
    }
  }, [isSelectionType, question.id]);

  React.useEffect(() => {
    if (open) {
      loadOptions();
    }
  }, [open, loadOptions]);

  // 선택 가능한 부모 질문들 로드 (조건부 질문용)
  React.useEffect(() => {
    const loadSelectableParents = async () => {
      if (!open) return;
      try {
        // 현재 질문과 같은 템플릿의 선택형 질문들만 가져오기
        const data = await getSelectableParentQuestions(question.templateId, question.id);
        setSelectableParents(data);
      } catch (e) {
        console.error("loadSelectableParents error", e);
        setSelectableParents([]);
      }
    };
    loadSelectableParents();
  }, [open, question.templateId, question.id]);

  // 부모 질문의 옵션 로드 (조건부 질문용)
  React.useEffect(() => {
    const loadParentOptions = async () => {
      if (!open) return;
      if (!parentQuestionId) {
        setParentOptions([]);
        return;
      }
      try {
        const data = await getComplianceQuestionOptions(parentQuestionId);
        setParentOptions(data.map((o: any) => ({ id: o.id, optionValue: o.optionValue, optionText: o.optionText })));
      } catch (e) {
        console.error("loadParentOptions error", e);
        setParentOptions([]);
      }
    };
    loadParentOptions();
  }, [open, parentQuestionId]);

  const onSubmit = async (data: QuestionFormData) => {
    try {
      setIsLoading(true);
      
      // 디버깅을 위한 로그
      console.log("Edit form data:", data);
      console.log("Current isConditional:", data.isConditional);
      console.log("Current parentQuestionId:", parentQuestionId);
      console.log("Current conditionalValue:", data.conditionalValue);
      
      // 조건부 질문 관련 데이터 처리
      const updateData = {
        ...data,
        parentQuestionId: data.isConditional ? parentQuestionId : null,
        conditionalValue: data.isConditional ? data.conditionalValue : null,
      };
      
      // isConditional은 제거 (스키마에 없음)
      delete (updateData as any).isConditional;
      
      console.log("Final updateData:", updateData);
      
      await updateComplianceQuestion(question.id, updateData);

      toast.success("질문이 성공적으로 수정되었습니다.");
      setOpen(false);
      
      // 페이지 새로고침
      router.refresh();
      
      if (onSuccess) {
        onSuccess();
      }
    } catch (error) {
      console.error("Error updating question:", error);
      
      // 중복 질문번호 오류 처리
      if (error instanceof Error && error.message === "DUPLICATE_QUESTION_NUMBER") {
        form.setError("questionNumber", {
          type: "manual",
          message: "이미 사용 중인 질문번호입니다."
        });
        toast.error("이미 사용 중인 질문번호입니다.");
      } else {
        toast.error("질문 수정 중 오류가 발생했습니다.");
      }
    } finally {
      setIsLoading(false);
    }
  };

  return (
    <Sheet open={open} onOpenChange={setOpen}>
      <SheetTrigger asChild>
        <Button variant="ghost" size="sm">
          <Edit className="h-4 w-4" />
        </Button>
      </SheetTrigger>
      <SheetContent className="sm:max-w-[500px] overflow-y-auto">
        <SheetHeader>
          <SheetTitle>질문 수정</SheetTitle>
          <SheetDescription>
            질문 내용을 수정합니다.
          </SheetDescription>
        </SheetHeader>
        
        <Form {...form}>
          <form onSubmit={form.handleSubmit(onSubmit)} className="space-y-4">
            <FormField
              control={form.control}
              name="questionNumber"
              render={({ field }) => (
                <FormItem>
                  <FormLabel>질문 번호</FormLabel>
                  <FormControl>
                    <Input placeholder="Q1" {...field} />
                  </FormControl>
                  <FormMessage />
                </FormItem>
              )}
            />

            {/* 필수 질문과 조건부 질문 체크박스 */}
            <div className="grid grid-cols-2 gap-4">
              <FormField
                control={form.control}
                name="isRequired"
                render={({ field }) => (
                  <FormItem className="flex flex-row items-start space-x-3 space-y-0">
                    <FormControl>
                      <Checkbox
                        checked={field.value}
                        onCheckedChange={(checked) => {
                          if (checked) {
                            // 필수 질문을 선택하면 조건부 질문 해제
                            form.setValue("isConditional", false);
                          }
                          field.onChange(checked);
                        }}
                      />
                    </FormControl>
                    <div className="space-y-1 leading-none">
                      <FormLabel>필수 질문</FormLabel>
                      <FormDescription>
                        응답자가 반드시 답변해야 하는 질문
                      </FormDescription>
                    </div>
                  </FormItem>
                )}
              />

              <FormField
                control={form.control}
                name="isConditional"
                render={({ field }) => (
                  <FormItem className="flex flex-row items-start space-x-3 space-y-0">
                    <FormControl>
                      <Checkbox
                        checked={field.value}
                        onCheckedChange={(checked) => {
                          if (checked) {
                            // 조건부 질문을 선택하면 필수 질문 해제
                            form.setValue("isRequired", false);
                          }
                          field.onChange(checked);
                        }}
                      />
                    </FormControl>
                    <div className="space-y-1 leading-none">
                      <FormLabel>조건부 질문</FormLabel>
                      <FormDescription>
                        특정 조건에 따라 표시되는 질문
                      </FormDescription>
                    </div>
                  </FormItem>
                )}
              />
            </div>

            <FormField
              control={form.control}
              name="questionText"
              render={({ field }) => (
                <FormItem>
                  <FormLabel>질문 내용</FormLabel>
                  <FormControl>
                    <Textarea 
                      placeholder="질문 내용을 입력하세요" 
                      className="min-h-[100px]"
                      {...field} 
                    />
                  </FormControl>
                  <FormMessage />
                </FormItem>
              )}
            />

            <FormField
              control={form.control}
              name="questionType"
              render={({ field }) => (
                <FormItem>
                  <FormLabel>질문 유형</FormLabel>
                  <Select 
                    onValueChange={(newValue) => {
                      const currentType = field.value;
                      const isCurrentSelectionType = [QUESTION_TYPES.RADIO, QUESTION_TYPES.CHECKBOX, QUESTION_TYPES.DROPDOWN].includes((currentType || "").toUpperCase() as any);
                      const isNewSelectionType = [QUESTION_TYPES.RADIO, QUESTION_TYPES.CHECKBOX, QUESTION_TYPES.DROPDOWN].includes(newValue.toUpperCase() as any);
                      
                      // 선택형에서 비선택형으로 변경하고 기존 옵션이 있는 경우
                      if (isCurrentSelectionType && !isNewSelectionType && options.length > 0) {
                        setPendingQuestionTypeChange(newValue);
                        setShowOptionsDeleteDialog(true);
                      } else {
                        field.onChange(newValue);
                      }
                    }} 
                    defaultValue={(field.value || "").toUpperCase()}
                  >
                    <FormControl>
                      <SelectTrigger>
                        <SelectValue placeholder="질문 유형을 선택하세요" />
                      </SelectTrigger>
                    </FormControl>
                    <SelectContent>
                      {Object.entries(QUESTION_TYPES).map(([key, value]) => (
                        <SelectItem key={key} value={value}>
                          {value}
                        </SelectItem>
                      ))}
                    </SelectContent>
                  </Select>
                  <FormMessage />
                </FormItem>
              )}
            />

            {isSelectionType && (
              <div className="space-y-3">
                <div className="flex items-center justify-between">
                  <div className="text-sm font-medium">옵션 관리</div>
                  <Button
                    type="button"
                    variant="outline"
                    size="sm"
                    onClick={() => {
                      setNewOptionValue("");
                      setNewOptionText("");
                      setNewOptionOther(false);
                      // 옵션 추가 모드 활성화
                      setShowOptionForm(true);
                    }}
                  >
                    <Plus className="h-4 w-4 mr-1" />
                    옵션 추가
                  </Button>
                </div>

                {/* 옵션 추가 폼 */}
                {showOptionForm && (
                  <div className="space-y-3 p-3 border rounded-lg bg-muted/50">
                    <div className="grid grid-cols-2 gap-3">
                      <div>
                        <Input 
                          value={newOptionValue} 
                          onChange={(e) => setNewOptionValue(e.target.value)} 
                          placeholder="option_value (예: YES)" 
                        />
                      </div>
                      <div>
                        <Input 
                          value={newOptionText} 
                          onChange={(e) => setNewOptionText(e.target.value)} 
                          placeholder="option_text (표시 라벨)" 
                        />
                      </div>
                    </div>
                    <div className="flex items-center justify-between">
                      <div className="flex items-center gap-2">
                        <Checkbox 
                          checked={newOptionOther} 
                          onCheckedChange={(v) => setNewOptionOther(Boolean(v))} 
                        />
                        <span className="text-sm text-muted-foreground">기타 허용</span>
                      </div>
                      <div className="flex gap-2">
                        <Button
                          type="button"
                          variant="outline"
                          size="sm"
                          onClick={async () => {
                            if (!newOptionValue || !newOptionText) {
                              toast.error("option_value와 option_text를 입력하세요.");
                              return;
                            }
                            try {
                              await createComplianceQuestionOption({
                                questionId: question.id,
                                optionValue: newOptionValue.toUpperCase(),
                                optionText: newOptionText,
                                allowsOtherInput: newOptionOther,
                                displayOrder: (options?.length || 0) + 1,
                              });
                              setNewOptionValue("");
                              setNewOptionText("");
                              setNewOptionOther(false);
                              setShowOptionForm(false);
                              await loadOptions();
                              toast.success("옵션이 추가되었습니다.");
                            } catch (e) {
                              console.error(e);
                              toast.error("옵션 추가 중 오류가 발생했습니다.");
                            }
                          }}
                        >
                          등록
                        </Button>
                        <Button
                          type="button"
                          variant="ghost"
                          size="sm"
                          onClick={() => {
                            setShowOptionForm(false);
                            setNewOptionValue("");
                            setNewOptionText("");
                            setNewOptionOther(false);
                          }}
                        >
                          취소
                        </Button>
                      </div>
                    </div>
                  </div>
                )}

                <div className="space-y-2">
                  {options.length === 0 ? (
                    <div className="text-xs text-muted-foreground">등록된 옵션이 없습니다.</div>
                  ) : (
                    options.map((opt) => (
                      <div key={opt.id} className="flex items-center gap-3 rounded border p-2">
                        <div className="text-xs text-muted-foreground w-10">#{opt.displayOrder}</div>
                        <div className="text-sm font-mono">{opt.optionValue}</div>
                        <div className="text-sm flex-1">{opt.optionText}</div>
                        {opt.allowsOtherInput && <Badge variant="secondary">기타 허용</Badge>}
                        <Button
                          type="button"
                          variant="ghost"
                          size="icon"
                          onClick={async () => {
                            try {
                              await deleteComplianceQuestionOption(opt.id);
                              await loadOptions();
                              toast.success("옵션이 삭제되었습니다.");
                            } catch (e) {
                              console.error(e);
                              toast.error("옵션 삭제 중 오류가 발생했습니다.");
                            }
                          }}
                        >
                          <Trash2 className="h-4 w-4" />
                        </Button>
                      </div>
                    ))
                  )}
                </div>
              </div>
            )}

            {/* 조건부 질문일 때만 부모 질문과 조건값 표시 */}
            {form.watch("isConditional") && (
              <div className="space-y-2">
                {/* 조건 질문 선택 */}
                <div>
                  <FormLabel>조건 질문</FormLabel>
                  <Select onValueChange={(v) => setParentQuestionId(Number(v))} value={String(parentQuestionId || "")}>
                    <SelectTrigger>
                      <SelectValue placeholder="조건 기준 질문을 선택하세요">
                        {parentQuestionId ? (
                          <div className="truncate max-w-[300px] text-left">
                            {selectableParents.find(p => p.id === parentQuestionId)?.questionText}
                          </div>
                        ) : null}
                      </SelectValue>
                    </SelectTrigger>
                    <SelectContent>
                      {selectableParents.map((p) => (
                        <SelectItem key={p.id} value={String(p.id)}>
                          {p.questionText}
                        </SelectItem>
                      ))}
                    </SelectContent>
                  </Select>
                </div>

                {/* 조건값 선택 */}
                <FormField
                  control={form.control}
                  name="conditionalValue"
                  render={({ field }) => (
                    <FormItem className="space-y-1">
                      <FormLabel>조건값</FormLabel>
                      {parentOptions.length > 0 ? (
                        <>
                          <Select onValueChange={field.onChange} defaultValue={(field.value || "").toString()}>
                            <SelectTrigger>
                              <SelectValue placeholder="조건값을 선택하세요" />
                            </SelectTrigger>
                            <SelectContent>
                              {parentOptions.map((opt) => (
                                <SelectItem key={opt.id} value={opt.optionValue}>
                                  {opt.optionValue}
                                </SelectItem>
                              ))}
                            </SelectContent>
                          </Select>
                        </>
                      ) : (
                        <>
                          <FormControl>
                            <Input placeholder="먼저 부모 질문을 선택하세요" disabled />
                          </FormControl>
                          <FormDescription>조건 질문을 선택하세요.</FormDescription>
                        </>
                      )}
                      <FormMessage />
                    </FormItem>
                  )}
                />
              </div>
            )}

            <SheetFooter>
              <Button 
                type="button" 
                variant="outline" 
                onClick={() => setOpen(false)}
                disabled={isLoading}
              >
                취소
              </Button>
              <Button type="submit" disabled={isLoading}>
                {isLoading ? "수정 중..." : "질문 수정"}
              </Button>
            </SheetFooter>
          </form>
        </Form>
      </SheetContent>
      
      {/* 옵션 삭제 확인 다이얼로그 */}
      <Dialog open={showOptionsDeleteDialog} onOpenChange={setShowOptionsDeleteDialog}>
        <DialogContent>
          <DialogHeader>
            <DialogTitle>옵션 삭제 확인</DialogTitle>
            <DialogDescription>
              질문 유형을 변경하면 기존 옵션들이 모두 삭제됩니다. 계속하시겠습니까?
            </DialogDescription>
          </DialogHeader>
          
          <div className="py-4">
            <div className="bg-muted p-4 rounded-lg">
              <h4 className="font-medium mb-2">삭제될 옵션들:</h4>
              {options.map((option, index) => (
                <div key={option.id} className="text-sm text-muted-foreground mb-1">
                  <strong>옵션 {index + 1}:</strong> {option.optionValue} - {option.optionText}
                </div>
              ))}
            </div>
          </div>

          <DialogFooter>
            <Button 
              type="button" 
              variant="outline" 
              onClick={() => {
                setShowOptionsDeleteDialog(false);
                setPendingQuestionTypeChange(null);
              }}
            >
              취소
            </Button>
            <Button 
              type="button" 
              variant="destructive" 
              onClick={async () => {
                try {
                  // 옵션들을 삭제
                  for (const option of options) {
                    await deleteComplianceQuestionOption(option.id);
                  }
                  setOptions([]);
                  
                  // 질문 유형 변경
                  if (pendingQuestionTypeChange) {
                    form.setValue("questionType", pendingQuestionTypeChange);
                  }
                  
                  toast.success("옵션이 삭제되고 질문 유형이 변경되었습니다.");
                  setShowOptionsDeleteDialog(false);
                  setPendingQuestionTypeChange(null);
                } catch (error) {
                  console.error("Error deleting options:", error);
                  toast.error("옵션 삭제 중 오류가 발생했습니다.");
                }
              }}
            >
              옵션 삭제 및 유형 변경
            </Button>
          </DialogFooter>
        </DialogContent>
      </Dialog>
    </Sheet>
  );
}