"use client";

import React, { useState, useEffect, useMemo } from "react";
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 { Input } from "@/components/ui/input";
import { Card, CardHeader, CardTitle, CardDescription, CardContent } from "@/components/ui/card";
import { Workflow, Info, CheckCircle, XCircle, Loader2, ArrowRight, ArrowDown } from "lucide-react";
import { ComponentData } from "@/types/screen";
import { FlowVisibilityConfig } from "@/types/control-management";
import { getFlowById, getFlowSteps } 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",
  );

  // 🆕 그룹 설정 (auto-compact 모드에서만 사용)
  const [groupId, setGroupId] = useState<string>(currentConfig?.groupId || `group-${Date.now()}`);
  const [groupDirection, setGroupDirection] = useState<"horizontal" | "vertical">(
    currentConfig?.groupDirection || "horizontal",
  );
  const [groupGap, setGroupGap] = useState<number>(currentConfig?.groupGap ?? 8);
  const [groupAlign, setGroupAlign] = useState<"start" | "center" | "end" | "space-between" | "space-around">(
    currentConfig?.groupAlign || "start",
  );

  // 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 getFlowSteps(flowId);
        if (!stepsResponse.success) {
          throw new Error("스텝 목록을 불러올 수 없습니다");
        }
        if (stepsResponse.data) {
          const sortedSteps = stepsResponse.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 자동 저장 (즉시 적용) - 오버라이드 가능한 파라미터 지원
  const applyConfig = (overrides?: Partial<FlowVisibilityConfig>) => {
    const config: FlowVisibilityConfig = {
      enabled,
      targetFlowComponentId: selectedFlowComponentId || "",
      targetFlowId: flowInfo?.id,
      targetFlowName: flowInfo?.name,
      mode,
      visibleSteps: mode === "whitelist" ? visibleSteps : undefined,
      hiddenSteps: mode === "blacklist" ? hiddenSteps : undefined,
      layoutBehavior,
      // 🆕 그룹 설정 (auto-compact 모드일 때만)
      ...(layoutBehavior === "auto-compact" && {
        groupId,
        groupDirection,
        groupGap,
        groupAlign,
      }),
      // 오버라이드 적용
      ...overrides,
    };

    console.log("💾 [FlowVisibilityConfig] 설정 자동 저장:", {
      componentId: component.id,
      config,
      timestamp: new Date().toISOString(),
    });

    // 현재 버튼에 설정 적용 (그룹 설정은 ScreenDesigner에서 자동으로 일괄 적용됨)
    onUpdateProperty("webTypeConfig.flowVisibilityConfig", config);
  };

  // 체크박스 토글
  const toggleStep = (stepId: number) => {
    if (mode === "whitelist") {
      const newSteps = visibleSteps.includes(stepId)
        ? visibleSteps.filter((id) => id !== stepId)
        : [...visibleSteps, stepId];
      setVisibleSteps(newSteps);
      // 🆕 새 상태값을 직접 전달하여 즉시 저장
      applyConfig({ visibleSteps: newSteps });
    } else if (mode === "blacklist") {
      const newSteps = hiddenSteps.includes(stepId)
        ? hiddenSteps.filter((id) => id !== stepId)
        : [...hiddenSteps, stepId];
      setHiddenSteps(newSteps);
      // 🆕 새 상태값을 직접 전달하여 즉시 저장
      applyConfig({ hiddenSteps: newSteps });
    }
  };

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

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

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

  return (
    <div className="space-y-4">
      <div className="space-y-1">
        <h4 className="flex items-center gap-2 text-xs font-medium">
          <Workflow className="h-4 w-4" />
          플로우 단계별 표시 설정
        </h4>
        <p className="text-muted-foreground text-xs">
          플로우의 특정 단계에서만 이 버튼을 표시하거나 숨길 수 있습니다
        </p>
      </div>

      <div className="space-y-4">
        {/* 활성화 체크박스 */}
        <div className="flex items-center gap-2">
          <Checkbox
            id="flow-control-enabled"
            checked={enabled}
            onCheckedChange={(checked) => {
              setEnabled(!!checked);
              setTimeout(() => applyConfig(), 0);
            }}
          />
          <Label htmlFor="flow-control-enabled" className="text-xs font-medium">
            플로우 단계에 따라 버튼 표시 제어
          </Label>
        </div>

        {enabled && (
          <>
            {/* 대상 플로우 선택 */}
            <div className="space-y-2">
              <Label className="text-xs font-medium">
                대상 플로우
              </Label>
              <Select
                value={selectedFlowComponentId || ""}
                onValueChange={(value) => {
                  setSelectedFlowComponentId(value);
                  setTimeout(() => applyConfig(), 0);
                }}
              >
                <SelectTrigger className="h-6 text-xs">
                  <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} className="text-xs">
                        {flowName}
                      </SelectItem>
                    );
                  })}
                </SelectContent>
              </Select>
            </div>

            {/* 플로우가 선택되면 스텝 목록 표시 */}
            {selectedFlowComponentId && flowSteps.length > 0 && (
              <>
                {/* 단계 선택 */}
                <div className="space-y-3">
                  <div className="flex items-center justify-between">
                    <Label className="text-xs font-medium">
                      표시할 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="bg-muted/30 space-y-2 rounded-lg border p-3">
                    {flowSteps.map((step) => {
                      const isChecked = visibleSteps.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-xs"
                          >
                            <Badge variant="outline" className="text-xs">
                              Step {step.stepOrder}
                            </Badge>
                            <span>{step.stepName}</span>
                            {isChecked && <CheckCircle className="ml-auto h-4 w-4 text-success" />}
                          </Label>
                        </div>
                      );
                    })}
                  </div>
                </div>

                {/* 정렬 방식 */}
                <div className="space-y-2">
                  <Label htmlFor="group-align" className="text-xs font-medium">
                    정렬 방식
                  </Label>
                  <Select
                    value={groupAlign}
                    onValueChange={(value: any) => {
                      setGroupAlign(value);
                      onUpdateProperty("webTypeConfig.flowVisibilityConfig.groupAlign", value);
                    }}
                  >
                    <SelectTrigger id="group-align" className="h-6 text-xs">
                      <SelectValue />
                    </SelectTrigger>
                    <SelectContent>
                      <SelectItem value="start" className="text-xs">
                        시작점 정렬
                      </SelectItem>
                      <SelectItem value="center" className="text-xs">
                        중앙 정렬
                      </SelectItem>
                      <SelectItem value="end" className="text-xs">
                        끝점 정렬
                      </SelectItem>
                      <SelectItem value="space-between" className="text-xs">
                        양 끝 정렬
                      </SelectItem>
                      <SelectItem value="space-around" className="text-xs">
                        균등 배분
                      </SelectItem>
                    </SelectContent>
                  </Select>
                </div>
              </>
            )}

            {/* 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>
            )}
          </>
        )}
      </div>
    </div>
  );
};
