"use client";

import React, { useState, useEffect, useMemo } from "react";
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
import { Label } from "@/components/ui/label";
import { Checkbox } from "@/components/ui/checkbox";
import { Button } from "@/components/ui/button";
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
import { RadioGroup, RadioGroupItem } from "@/components/ui/radio-group";
import { Badge } from "@/components/ui/badge";
import { Alert, AlertDescription } from "@/components/ui/alert";
import { Workflow, Info, CheckCircle, XCircle, Loader2 } from "lucide-react";
import { ComponentData } from "@/types/screen";
import { FlowVisibilityConfig } from "@/types/control-management";
import { getFlowById } from "@/lib/api/flow";
import type { FlowDefinition, FlowStep } from "@/types/flow";
import { toast } from "sonner";

interface FlowVisibilityConfigPanelProps {
  component: ComponentData; // 현재 선택된 버튼
  allComponents: ComponentData[]; // 화면의 모든 컴포넌트
  onUpdateProperty: (path: string, value: any) => void;
}

/**
 * 플로우 단계별 버튼 표시 설정 패널
 * 
 * 플로우 위젯이 화면에 있을 때, 버튼이 특정 플로우 단계에서만 표시되도록 설정할 수 있습니다.
 */
export const FlowVisibilityConfigPanel: React.FC<FlowVisibilityConfigPanelProps> = ({
  component,
  allComponents,
  onUpdateProperty,
}) => {
  // 현재 설정
  const currentConfig: FlowVisibilityConfig | undefined = (component as any).webTypeConfig?.flowVisibilityConfig;

  // 화면의 모든 플로우 위젯 찾기
  const flowWidgets = useMemo(() => {
    return allComponents.filter((comp) => {
      const isFlowWidget =
        comp.type === "flow" ||
        (comp.type === "component" && (comp as any).componentConfig?.type === "flow-widget");
      return isFlowWidget;
    });
  }, [allComponents]);

  // State
  const [enabled, setEnabled] = useState(currentConfig?.enabled || false);
  const [selectedFlowComponentId, setSelectedFlowComponentId] = useState<string | null>(
    currentConfig?.targetFlowComponentId || null
  );
  const [mode, setMode] = useState<"whitelist" | "blacklist" | "all">(currentConfig?.mode || "whitelist");
  const [visibleSteps, setVisibleSteps] = useState<number[]>(currentConfig?.visibleSteps || []);
  const [hiddenSteps, setHiddenSteps] = useState<number[]>(currentConfig?.hiddenSteps || []);
  const [layoutBehavior, setLayoutBehavior] = useState<"preserve-position" | "auto-compact">(
    currentConfig?.layoutBehavior || "auto-compact"
  );

  // 선택된 플로우의 스텝 목록
  const [flowSteps, setFlowSteps] = useState<FlowStep[]>([]);
  const [flowInfo, setFlowInfo] = useState<FlowDefinition | null>(null);
  const [loading, setLoading] = useState(false);

  // 플로우가 없을 때
  if (flowWidgets.length === 0) {
    return (
      <Card>
        <CardHeader>
          <CardTitle className="flex items-center gap-2 text-base">
            <Workflow className="h-4 w-4" />
            플로우 단계별 표시 설정
          </CardTitle>
        </CardHeader>
        <CardContent>
          <Alert>
            <Info className="h-4 w-4" />
            <AlertDescription className="text-xs">
              화면에 플로우 위젯을 추가하면 단계별 버튼 표시 제어가 가능합니다.
            </AlertDescription>
          </Alert>
        </CardContent>
      </Card>
    );
  }

  // 선택된 플로우의 스텝 로드
  useEffect(() => {
    if (!selectedFlowComponentId) {
      setFlowSteps([]);
      setFlowInfo(null);
      return;
    }

    const loadFlowSteps = async () => {
      try {
        setLoading(true);

        // 선택된 플로우 위젯 찾기
        const flowWidget = flowWidgets.find((fw) => fw.id === selectedFlowComponentId);
        if (!flowWidget) return;

        // flowId 추출
        const flowConfig = (flowWidget as any).componentConfig || {};
        const flowId = flowConfig.flowId;
        if (!flowId) {
          toast.error("플로우 ID를 찾을 수 없습니다");
          return;
        }

        // 플로우 정보 조회
        const flowResponse = await getFlowById(flowId);
        if (!flowResponse.success || !flowResponse.data) {
          throw new Error("플로우를 찾을 수 없습니다");
        }
        setFlowInfo(flowResponse.data);

        // 스텝 목록 조회
        const stepsResponse = await fetch(`/api/flow/definitions/${flowId}/steps`);
        if (!stepsResponse.ok) {
          throw new Error("스텝 목록을 불러올 수 없습니다");
        }
        const stepsData = await stepsResponse.json();
        if (stepsData.success && stepsData.data) {
          const sortedSteps = stepsData.data.sort((a: FlowStep, b: FlowStep) => a.stepOrder - b.stepOrder);
          setFlowSteps(sortedSteps);
        }
      } catch (error: any) {
        console.error("플로우 스텝 로딩 실패:", error);
        toast.error(error.message || "플로우 정보를 불러오는데 실패했습니다");
      } finally {
        setLoading(false);
      }
    };

    loadFlowSteps();
  }, [selectedFlowComponentId, flowWidgets]);

  // 설정 저장
  const handleSave = () => {
    const config: FlowVisibilityConfig = {
      enabled,
      targetFlowComponentId: selectedFlowComponentId || "",
      targetFlowId: flowInfo?.id,
      targetFlowName: flowInfo?.name,
      mode,
      visibleSteps: mode === "whitelist" ? visibleSteps : undefined,
      hiddenSteps: mode === "blacklist" ? hiddenSteps : undefined,
      layoutBehavior,
    };

    onUpdateProperty("webTypeConfig.flowVisibilityConfig", config);
    toast.success("플로우 단계별 표시 설정이 저장되었습니다");
  };

  // 체크박스 토글
  const toggleStep = (stepId: number) => {
    if (mode === "whitelist") {
      setVisibleSteps((prev) =>
        prev.includes(stepId) ? prev.filter((id) => id !== stepId) : [...prev, stepId]
      );
    } else if (mode === "blacklist") {
      setHiddenSteps((prev) =>
        prev.includes(stepId) ? prev.filter((id) => id !== stepId) : [...prev, stepId]
      );
    }
  };

  // 빠른 선택
  const selectAll = () => {
    if (mode === "whitelist") {
      setVisibleSteps(flowSteps.map((s) => s.id));
    } else if (mode === "blacklist") {
      setHiddenSteps([]);
    }
  };

  const selectNone = () => {
    if (mode === "whitelist") {
      setVisibleSteps([]);
    } else if (mode === "blacklist") {
      setHiddenSteps(flowSteps.map((s) => s.id));
    }
  };

  const invertSelection = () => {
    if (mode === "whitelist") {
      const allStepIds = flowSteps.map((s) => s.id);
      setVisibleSteps(allStepIds.filter((id) => !visibleSteps.includes(id)));
    } else if (mode === "blacklist") {
      const allStepIds = flowSteps.map((s) => s.id);
      setHiddenSteps(allStepIds.filter((id) => !hiddenSteps.includes(id)));
    }
  };

  return (
    <Card>
      <CardHeader>
        <CardTitle className="flex items-center gap-2 text-base">
          <Workflow className="h-4 w-4" />
          플로우 단계별 표시 설정
        </CardTitle>
        <CardDescription className="text-xs">
          플로우의 특정 단계에서만 이 버튼을 표시하거나 숨길 수 있습니다
        </CardDescription>
      </CardHeader>

      <CardContent className="space-y-4">
        {/* 활성화 체크박스 */}
        <div className="flex items-center gap-2">
          <Checkbox id="flow-control-enabled" checked={enabled} onCheckedChange={(checked) => setEnabled(!!checked)} />
          <Label htmlFor="flow-control-enabled" className="text-sm font-medium">
            플로우 단계에 따라 버튼 표시 제어
          </Label>
        </div>

        {enabled && (
          <>
            {/* 대상 플로우 선택 */}
            <div className="space-y-2">
              <Label className="text-sm font-medium">대상 플로우</Label>
              <Select value={selectedFlowComponentId || ""} onValueChange={setSelectedFlowComponentId}>
                <SelectTrigger className="h-8 text-xs sm:h-10 sm:text-sm">
                  <SelectValue placeholder="플로우 위젯 선택" />
                </SelectTrigger>
                <SelectContent>
                  {flowWidgets.map((fw) => {
                    const flowConfig = (fw as any).componentConfig || {};
                    const flowName = flowConfig.flowName || `플로우 ${fw.id}`;
                    return (
                      <SelectItem key={fw.id} value={fw.id}>
                        {flowName}
                      </SelectItem>
                    );
                  })}
                </SelectContent>
              </Select>
            </div>

            {/* 플로우가 선택되면 스텝 목록 표시 */}
            {selectedFlowComponentId && flowSteps.length > 0 && (
              <>
                {/* 모드 선택 */}
                <div className="space-y-2">
                  <Label className="text-sm font-medium">표시 모드</Label>
                  <RadioGroup value={mode} onValueChange={(value: any) => setMode(value)}>
                    <div className="flex items-center space-x-2">
                      <RadioGroupItem value="whitelist" id="mode-whitelist" />
                      <Label htmlFor="mode-whitelist" className="text-sm font-normal">
                        화이트리스트 (선택한 단계에서만 표시)
                      </Label>
                    </div>
                    <div className="flex items-center space-x-2">
                      <RadioGroupItem value="blacklist" id="mode-blacklist" />
                      <Label htmlFor="mode-blacklist" className="text-sm font-normal">
                        블랙리스트 (선택한 단계에서 숨김)
                      </Label>
                    </div>
                    <div className="flex items-center space-x-2">
                      <RadioGroupItem value="all" id="mode-all" />
                      <Label htmlFor="mode-all" className="text-sm font-normal">
                        모든 단계에서 표시
                      </Label>
                    </div>
                  </RadioGroup>
                </div>

                {/* 단계 선택 (all 모드가 아닐 때만) */}
                {mode !== "all" && (
                  <div className="space-y-3">
                    <div className="flex items-center justify-between">
                      <Label className="text-sm font-medium">
                        {mode === "whitelist" ? "표시할 단계" : "숨길 단계"}
                      </Label>
                      <div className="flex gap-1">
                        <Button variant="ghost" size="sm" onClick={selectAll} className="h-7 px-2 text-xs">
                          모두 선택
                        </Button>
                        <Button variant="ghost" size="sm" onClick={selectNone} className="h-7 px-2 text-xs">
                          모두 해제
                        </Button>
                        <Button variant="ghost" size="sm" onClick={invertSelection} className="h-7 px-2 text-xs">
                          반전
                        </Button>
                      </div>
                    </div>

                    {/* 스텝 체크박스 목록 */}
                    <div className="space-y-2 rounded-lg border bg-muted/30 p-3">
                      {flowSteps.map((step) => {
                        const isChecked =
                          mode === "whitelist"
                            ? visibleSteps.includes(step.id)
                            : hiddenSteps.includes(step.id);

                        return (
                          <div key={step.id} className="flex items-center gap-2">
                            <Checkbox
                              id={`step-${step.id}`}
                              checked={isChecked}
                              onCheckedChange={() => toggleStep(step.id)}
                            />
                            <Label htmlFor={`step-${step.id}`} className="flex flex-1 items-center gap-2 text-sm">
                              <Badge variant="outline" className="text-xs">
                                Step {step.stepOrder}
                              </Badge>
                              <span>{step.stepName}</span>
                              {isChecked && (
                                <CheckCircle className={`ml-auto h-4 w-4 ${mode === "whitelist" ? "text-green-500" : "text-red-500"}`} />
                              )}
                            </Label>
                          </div>
                        );
                      })}
                    </div>
                  </div>
                )}

                {/* 레이아웃 옵션 */}
                <div className="space-y-2">
                  <Label className="text-sm font-medium">레이아웃 동작</Label>
                  <RadioGroup value={layoutBehavior} onValueChange={(value: any) => setLayoutBehavior(value)}>
                    <div className="flex items-center space-x-2">
                      <RadioGroupItem value="preserve-position" id="layout-preserve" />
                      <Label htmlFor="layout-preserve" className="text-sm font-normal">
                        원래 위치 유지 (빈 공간 가능)
                      </Label>
                    </div>
                    <div className="flex items-center space-x-2">
                      <RadioGroupItem value="auto-compact" id="layout-compact" />
                      <Label htmlFor="layout-compact" className="text-sm font-normal">
                        자동 정렬 (빈 공간 제거) ⭐ 권장
                      </Label>
                    </div>
                  </RadioGroup>
                </div>

                {/* 미리보기 */}
                <Alert>
                  <Info className="h-4 w-4" />
                  <AlertDescription className="text-xs">
                    {mode === "whitelist" && visibleSteps.length > 0 && (
                      <div>
                        <p className="font-medium">표시 단계:</p>
                        <div className="mt-1 flex flex-wrap gap-1">
                          {visibleSteps.map((stepId) => {
                            const step = flowSteps.find((s) => s.id === stepId);
                            return (
                              <Badge key={stepId} variant="secondary" className="text-xs">
                                {step?.stepName || `Step ${stepId}`}
                              </Badge>
                            );
                          })}
                        </div>
                      </div>
                    )}
                    {mode === "blacklist" && hiddenSteps.length > 0 && (
                      <div>
                        <p className="font-medium">숨김 단계:</p>
                        <div className="mt-1 flex flex-wrap gap-1">
                          {hiddenSteps.map((stepId) => {
                            const step = flowSteps.find((s) => s.id === stepId);
                            return (
                              <Badge key={stepId} variant="destructive" className="text-xs">
                                {step?.stepName || `Step ${stepId}`}
                              </Badge>
                            );
                          })}
                        </div>
                      </div>
                    )}
                    {mode === "all" && <p>이 버튼은 모든 단계에서 표시됩니다.</p>}
                    {mode === "whitelist" && visibleSteps.length === 0 && <p>표시할 단계를 선택해주세요.</p>}
                  </AlertDescription>
                </Alert>

                {/* 저장 버튼 */}
                <Button onClick={handleSave} className="w-full">
                  설정 저장
                </Button>
              </>
            )}

            {/* 플로우 선택 안내 */}
            {selectedFlowComponentId && flowSteps.length === 0 && !loading && (
              <Alert variant="destructive">
                <XCircle className="h-4 w-4" />
                <AlertDescription className="text-xs">선택한 플로우에 단계가 없습니다.</AlertDescription>
              </Alert>
            )}

            {loading && (
              <div className="flex items-center justify-center py-4">
                <Loader2 className="mr-2 h-4 w-4 animate-spin" />
                <span className="text-muted-foreground text-xs">플로우 정보를 불러오는 중...</span>
              </div>
            )}
          </>
        )}
      </CardContent>
    </Card>
  );
};