ttrpg-tools/src/components/md-deck/hooks/usePlotterExport.ts

import type { DeckStore } from './deckStore';
import type { PageData } from './usePDFExport';
import type { CardShape } from '../types';
import {
  getCardShapePoints,
  calculateCenter
} from '../../../plotcutter/contour';
import { pts2plotter } from '../../../plotcutter/plotter';

export interface CardPathData {
  points: [number, number][];
  centerX: number;
  centerY: number;
  startPoint: [number, number];
  endPoint: [number, number];
}

export interface PltExportData {
  paths: CardPathData[];
  travelPaths: [number, number][][];
  plotterCode: string;
  a4Width: number;
  a4Height: number;
}

export interface UsePlotterExportReturn {
  generatePltData: (pages: PageData[]) => PltExportData | null;
  downloadPltFile: (plotterCode: string) => void;
  exportToPlt: (pages: PageData[]) => void;
}

/**
 * 生成空走路径（抬刀移动路径）
 * 从左上角出发，连接所有卡片的起点/终点，最后返回左上角
 */
function generateTravelPaths(
  cardPaths: CardPathData[],
  a4Height: number
): [number, number][][] {
  const travelPaths: [number, number][][] = [];

  // 起点：左上角 (0, a4Height) - 注意 SVG 坐标 Y 向下，plotter 坐标 Y 向上
  const startPoint: [number, number] = [0, a4Height];

  if (cardPaths.length === 0) {
    return travelPaths;
  }

  // 从起点到第一张卡的起点
  travelPaths.push([startPoint, cardPaths[0].startPoint]);

  // 卡片之间的移动
  for (let i = 0; i < cardPaths.length - 1; i++) {
    const currentEnd = cardPaths[i].endPoint;
    const nextStart = cardPaths[i + 1].startPoint;
    travelPaths.push([currentEnd, nextStart]);
  }

  // 从最后一张卡返回起点
  travelPaths.push([cardPaths[cardPaths.length - 1].endPoint, startPoint]);

  return travelPaths;
}

/**
 * PLT 导出 hook - 生成 HPGL 格式文件并下载
 */
export function usePlotterExport(store: DeckStore): UsePlotterExportReturn {
  const bleed = () => store.state.bleed || 1;
  const cornerRadius = () => store.state.cornerRadius ?? 3;
  const cardWidth = () => store.state.dimensions?.cardWidth || 56;
  const cardHeight = () => store.state.dimensions?.cardHeight || 88;
  const shape = () => store.state.shape;
  const a4Width = 297; // 横向 A4
  const a4Height = 210;

  /**
   * 生成 PLT 数据（不下载，用于预览）
   */
  const generatePltData = (pages: PageData[]): PltExportData | null => {
    const paths: CardPathData[] = [];
    const currentBleed = bleed();
    const currentCornerRadius = cornerRadius();

    // 计算切割尺寸（排版尺寸减去出血）
    const cutWidth = cardWidth() - currentBleed * 2;
    const cutHeight = cardHeight() - currentBleed * 2;

    for (const page of pages) {
      for (const card of page.cards) {
        if (card.side !== 'front') continue;

        // 获取卡片形状点（相对于卡片原点，使用切割尺寸）
        const shapePoints = getCardShapePoints(shape(), cutWidth, cutHeight, currentCornerRadius);

        // 转换点到页面坐标：
        // - X 轴：卡片位置 + 出血偏移
        // - Y 轴：翻转（SVG Y 向下，plotter Y 向上）
        const pagePoints = shapePoints.map(([x, y]) => [
          card.x + currentBleed + x,
          a4Height - (card.y + currentBleed + y)
        ] as [number, number]);

        const center = calculateCenter(pagePoints);
        const startPoint = pagePoints[0];
        const endPoint = pagePoints[pagePoints.length - 1];
        
        paths.push({
          points: pagePoints,
          centerX: center.x,
          centerY: center.y,
          startPoint,
          endPoint
        });
      }
    }

    if (paths.length === 0) {
      return null;
    }

    // 生成空走路径
    const travelPaths = generateTravelPaths(paths, a4Height);
    
    // 生成 HPGL 代码（包含空走路径，从左上角出发并返回）
    const allPaths = paths.map(p => p.points);
    const startPoint: [number, number] = [0, a4Height]; // 左上角
    const endPoint: [number, number] = [0, a4Height];   // 返回左上角
    const plotterCode = pts2plotter(allPaths, a4Width, a4Height, 1, startPoint, endPoint);

    return {
      paths,
      travelPaths,
      plotterCode,
      a4Width,
      a4Height
    };
  };

  /**
   * 下载 PLT 文件
   */
  const downloadPltFile = (plotterCode: string) => {
    const blob = new Blob([plotterCode], { type: 'application/vnd.hp-HPGL' });
    const url = URL.createObjectURL(blob);
    const link = document.createElement('a');
    link.href = url;
    link.download = `deck-export-${new Date().toISOString().slice(0, 19).replace(/:/g, '-')}.plt`;
    document.body.appendChild(link);
    link.click();
    document.body.removeChild(link);
    URL.revokeObjectURL(url);
  };

  /**
   * 直接导出 PLT（兼容旧接口）
   */
  const exportToPlt = (pages: PageData[]) => {
    const data = generatePltData(pages);
    if (!data) {
      alert('没有可导出的卡片');
      return;
    }
    downloadPltFile(data.plotterCode);
  };

  return { generatePltData, downloadPltFile, exportToPlt };
}