import { useEffect, useRef } from "react";
import { DragFill } from "@/components";
import { cn } from "@/lib/utils";
import type { DragQuizPanelProps } from "./types";

/** 拖拽题面板：使用 DragFill 组件 */
const DragQuizPanel = ({
  visible,
  zIndex = 10000,
  title,
  questionPrefix,
  questionSuffix,
  options,
  blanks,
  blankSeparators,
  value,
  error,
  onChange,
}: DragQuizPanelProps) => {
  // 跟踪之前的 visible 状态
  const prevVisibleRef = useRef(visible);

  // 当窗口关闭时，清除拖拽状态
  useEffect(() => {
    // 如果从可见变为不可见，清除拖拽状态
    if (prevVisibleRef.current && !visible && value.length > 0) {
      onChange([]);
    }
    prevVisibleRef.current = visible;
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [visible]);

  if (!visible) return null;

  return (
    <div
      className="fixed inset-0 flex items-center justify-center bg-black/40"
      style={{ zIndex }}
    >
      <div className="relative w-[1728px] h-[972px] flex flex-col items-center pt-12 pb-14">
        {/* 题干卡片 */}
        <div className="w-[1700px] rounded-[32px] bg-black/90 px-20 py-12 shadow-[0_20px_60px_rgba(240,190,117,0.8)] border-4 border-[#d4c5a9]">
          <div className="text-[32px] leading-relaxed text-white">
            {title && <div className="mb-4">{title}</div>}

            <div>
              {questionPrefix && <span>{questionPrefix}</span>}
              {blanks.map((blank, index) => {
                const filledResult = value.find((r) => r.blankId === blank.id);
                const filledValue = filledResult?.optionValue || null;
                return (
                  <span key={blank.id}>
                    <span
                      data-blank-id={blank.id}
                      className={cn(
                        "inline-flex items-center justify-center min-w-[140px] h-[56px] px-6 mx-3",
                        "rounded-xl border-2 transition-all duration-300 shadow-[0_4px_16px_rgba(0,0,0,0.2)]",
                        filledValue
                          ? "border-[#f0be75] bg-gradient-to-br from-[#3a3020] to-[#2a2520] backdrop-blur-sm"
                          : "border-[#d4c5a9]/60 bg-white/10 backdrop-blur-sm hover:border-[#d4c5a9]"
                      )}
                    >
                      {filledValue ? (
                        <span className="text-[#f0be75] font-semibold flex items-center gap-3">
                          <span className="text-[28px]">{filledValue}</span>
                          <button
                            type="button"
                            className="w-7 h-7 flex items-center justify-center rounded-full bg-[#8b4513]/80 hover:bg-[#a0522d] text-white text-sm transition-all hover:scale-110 shadow-lg"
                            onClick={(e) => {
                              e.stopPropagation();
                              onChange(
                                value.filter((r) => r.blankId !== blank.id)
                              );
                            }}
                          >
                            ×
                          </button>
                        </span>
                      ) : (
                        <span className="text-white/40 text-[24px] font-light">
                          ____
                        </span>
                      )}
                    </span>
                    {index < blanks.length - 1 && (
                      <span className="text-white/80 mx-1">
                        {blankSeparators && blankSeparators[index]
                          ? blankSeparators[index]
                          : "、"}
                      </span>
                    )}
                  </span>
                );
              })}
              {questionSuffix && <span>{questionSuffix}</span>}
              {/* 答案反馈 */}
              {error && (
                <div className="mt-5 text-center text-[26px] text-[#fcbe53]">
                  {error}
                </div>
              )}
            </div>
          </div>
        </div>

        {/* 使用 DragFill 组件 */}
        <div className="w-[1500px] mt-16">
          <DragFill
            options={options}
            blanks={blanks}
            value={value}
            onChange={onChange}
            hideLabels
            showSubmitButton={false}
            layout="vertical"
            className="w-full"
            renderOption={(option, isUsed) => (
              <div
                className={cn(
                  "relative h-[110px] px-10 flex items-center justify-center",
                  "rounded-[32px] transition-all duration-300",
                  "text-[32px] font-bold border-3 shadow-[0_8px_32px_rgba(0,0,0,0.3)]",
                  isUsed
                    ? "border-[#8b7355] bg-[#3d3329] text-[#a89378] cursor-not-allowed opacity-50"
                    : "border-[#d4c5a9] bg-gradient-to-br from-[#4a3f35] to-[#3a2f25] text-[#f5e6d3] cursor-move hover:border-[#f0be75] hover:shadow-[0_12px_40px_rgba(240,190,117,0.7)] hover:scale-[1.02]"
                )}
              >
                {!isUsed && (
                  <div className="absolute inset-0 rounded-[32px] bg-gradient-to-br from-[#d4c5a9]/20 to-transparent pointer-events-none" />
                )}
                <span className="relative z-10 drop-shadow-[0_2px_4px_rgba(0,0,0,0.3)]">
                  {option.label}
                </span>
              </div>
            )}
            renderBlank={(_blank) => {
              // 返回一个隐藏元素，实际的空白区域在题干中
              // 但需要通过 data-blank-id 让 DragFill 能找到它
              return <div className="hidden" />;
            }}
          />
        </div>
      </div>
    </div>
  );
};

export default DragQuizPanel;