"use client";

import { useRef, useState } from "react";
import { ComponentConfig } from "@/types/report";
import { useReportDesigner } from "@/contexts/ReportDesignerContext";

interface CanvasComponentProps {
  component: ComponentConfig;
}

export function CanvasComponent({ component }: CanvasComponentProps) {
  const { selectedComponentId, selectComponent, updateComponent } = useReportDesigner();
  const [isDragging, setIsDragging] = useState(false);
  const [isResizing, setIsResizing] = useState(false);
  const [dragStart, setDragStart] = useState({ x: 0, y: 0 });
  const [resizeStart, setResizeStart] = useState({ x: 0, y: 0, width: 0, height: 0 });
  const componentRef = useRef<HTMLDivElement>(null);

  const isSelected = selectedComponentId === component.id;

  // 드래그 시작
  const handleMouseDown = (e: React.MouseEvent) => {
    if ((e.target as HTMLElement).classList.contains("resize-handle")) {
      return;
    }

    e.stopPropagation();
    selectComponent(component.id);
    setIsDragging(true);
    setDragStart({
      x: e.clientX - component.x,
      y: e.clientY - component.y,
    });
  };

  // 리사이즈 시작
  const handleResizeStart = (e: React.MouseEvent) => {
    e.stopPropagation();
    setIsResizing(true);
    setResizeStart({
      x: e.clientX,
      y: e.clientY,
      width: component.width,
      height: component.height,
    });
  };

  // 마우스 이동 핸들러 (전역)
  useState(() => {
    const handleMouseMove = (e: MouseEvent) => {
      if (isDragging) {
        const newX = Math.max(0, e.clientX - dragStart.x);
        const newY = Math.max(0, e.clientY - dragStart.y);
        updateComponent(component.id, { x: newX, y: newY });
      } else if (isResizing) {
        const deltaX = e.clientX - resizeStart.x;
        const deltaY = e.clientY - resizeStart.y;
        const newWidth = Math.max(50, resizeStart.width + deltaX);
        const newHeight = Math.max(30, resizeStart.height + deltaY);
        updateComponent(component.id, { width: newWidth, height: newHeight });
      }
    };

    const handleMouseUp = () => {
      setIsDragging(false);
      setIsResizing(false);
    };

    if (isDragging || isResizing) {
      document.addEventListener("mousemove", handleMouseMove);
      document.addEventListener("mouseup", handleMouseUp);
      return () => {
        document.removeEventListener("mousemove", handleMouseMove);
        document.removeEventListener("mouseup", handleMouseUp);
      };
    }
  });

  // 컴포넌트 타입별 렌더링
  const renderContent = () => {
    switch (component.type) {
      case "text":
        return (
          <div className="h-full w-full">
            <div className="mb-1 text-xs text-gray-500">텍스트 필드</div>
            <input
              type="text"
              className="w-full rounded border px-2 py-1 text-sm"
              placeholder="텍스트 입력"
              onClick={(e) => e.stopPropagation()}
            />
          </div>
        );

      case "label":
        return (
          <div className="h-full w-full">
            <div className="mb-1 text-xs text-gray-500">레이블</div>
            <div className="font-semibold">레이블 텍스트</div>
          </div>
        );

      case "table":
        return (
          <div className="h-full w-full overflow-auto">
            <div className="mb-1 text-xs text-gray-500">테이블 (디테일 데이터)</div>
            <table className="w-full border-collapse text-xs">
              <thead>
                <tr className="bg-gray-100">
                  <th className="border p-1">품목명</th>
                  <th className="border p-1">수량</th>
                  <th className="border p-1">단가</th>
                </tr>
              </thead>
              <tbody>
                <tr>
                  <td className="border p-1">품목1</td>
                  <td className="border p-1">10</td>
                  <td className="border p-1">50,000</td>
                </tr>
                <tr>
                  <td className="border p-1">품목2</td>
                  <td className="border p-1">5</td>
                  <td className="border p-1">30,000</td>
                </tr>
              </tbody>
            </table>
          </div>
        );

      default:
        return <div>알 수 없는 컴포넌트</div>;
    }
  };

  return (
    <div
      ref={componentRef}
      className={`absolute cursor-move rounded border-2 bg-white p-2 shadow-sm ${
        isSelected ? "border-blue-500 ring-2 ring-blue-300" : "border-gray-400"
      }`}
      style={{
        left: `${component.x}px`,
        top: `${component.y}px`,
        width: `${component.width}px`,
        height: `${component.height}px`,
        zIndex: component.zIndex,
      }}
      onMouseDown={handleMouseDown}
    >
      {renderContent()}

      {/* 리사이즈 핸들 (선택된 경우만) */}
      {isSelected && (
        <div
          className="resize-handle absolute right-0 bottom-0 h-3 w-3 cursor-se-resize rounded-full bg-blue-500"
          style={{ transform: "translate(50%, 50%)" }}
          onMouseDown={handleResizeStart}
        />
      )}
    </div>
  );
}
