"use client";

import React from "react";
import { getFullImageUrl } from "@/lib/api/client";
import { WatermarkConfig } from "@/types/report";

interface Props {
  watermark: WatermarkConfig;
  /** 캔버스/페이지 너비 (px) */
  width: number;
  /** 캔버스/페이지 높이 (px) */
  height: number;
}

/**
 * 워터마크 레이어 공용 컴포넌트
 *
 * ReportDesignerCanvas 와 ReportPreviewModal 양쪽에서 사용.
 * imageUrl 이 "data:" 로 시작하면 그대로 사용하고,
 * 서버 경로인 경우 getFullImageUrl 로 변환한다.
 */
export function WatermarkLayer({ watermark, width, height }: Props) {
  const baseStyle: React.CSSProperties = {
    position: "absolute",
    top: 0,
    left: 0,
    width: "100%",
    height: "100%",
    pointerEvents: "none",
    overflow: "hidden",
    zIndex: 1,
  };

  const rotation = watermark.rotation ?? -45;

  const resolveImageSrc = (url: string): string => (url.startsWith("data:") ? url : getFullImageUrl(url));

  const renderContent = (tileFontSize?: number) => {
    if (watermark.type === "text") {
      return (
        <span
          style={{
            fontSize: `${tileFontSize ?? watermark.fontSize ?? 48}px`,
            color: watermark.fontColor || "#cccccc",
            fontWeight: "bold",
            userSelect: "none",
            whiteSpace: "nowrap",
          }}
        >
          {watermark.text || "WATERMARK"}
        </span>
      );
    }
    if (watermark.imageUrl) {
      return null; // 이미지는 각 스타일 블록에서 직접 렌더링
    }
    return null;
  };

  // 대각선 스타일
  if (watermark.style === "diagonal") {
    return (
      <div style={baseStyle}>
        <div
          className="absolute flex items-center justify-center"
          style={{
            top: "50%",
            left: "50%",
            transform: `translate(-50%, -50%) rotate(${rotation}deg)`,
            opacity: watermark.opacity,
            whiteSpace: "nowrap",
          }}
        >
          {watermark.type === "text"
            ? renderContent()
            : watermark.imageUrl && (
                <img
                  src={resolveImageSrc(watermark.imageUrl)}
                  alt="watermark"
                  style={{
                    maxWidth: "50%",
                    maxHeight: "50%",
                    objectFit: "contain",
                  }}
                />
              )}
        </div>
      </div>
    );
  }

  // 중앙 스타일
  if (watermark.style === "center") {
    return (
      <div style={baseStyle}>
        <div
          className="absolute flex items-center justify-center"
          style={{
            top: "50%",
            left: "50%",
            transform: "translate(-50%, -50%)",
            opacity: watermark.opacity,
          }}
        >
          {watermark.type === "text"
            ? renderContent()
            : watermark.imageUrl && (
                <img
                  src={resolveImageSrc(watermark.imageUrl)}
                  alt="watermark"
                  style={{
                    maxWidth: "50%",
                    maxHeight: "50%",
                    objectFit: "contain",
                  }}
                />
              )}
        </div>
      </div>
    );
  }

  // 타일 스타일
  if (watermark.style === "tile") {
    const tileRotation = watermark.rotation ?? -30;
    const tileSize = watermark.type === "text" ? (watermark.fontSize || 48) * 4 : 150;
    const cols = Math.ceil(width / tileSize) + 2;
    const rows = Math.ceil(height / tileSize) + 2;

    return (
      <div style={baseStyle}>
        <div
          style={{
            position: "absolute",
            top: "-50%",
            left: "-50%",
            width: "200%",
            height: "200%",
            display: "flex",
            flexWrap: "wrap",
            alignContent: "flex-start",
            transform: `rotate(${tileRotation}deg)`,
            opacity: watermark.opacity,
          }}
        >
          {Array.from({ length: rows * cols }).map((_, index) => (
            <div
              key={index}
              style={{
                width: `${tileSize}px`,
                height: `${tileSize}px`,
                display: "flex",
                alignItems: "center",
                justifyContent: "center",
              }}
            >
              {watermark.type === "text"
                ? renderContent(watermark.fontSize || 24)
                : watermark.imageUrl && (
                    <img
                      src={resolveImageSrc(watermark.imageUrl)}
                      alt="watermark"
                      style={{
                        width: `${tileSize * 0.6}px`,
                        height: `${tileSize * 0.6}px`,
                        objectFit: "contain",
                      }}
                    />
                  )}
            </div>
          ))}
        </div>
      </div>
    );
  }

  return null;
}