import type { DeckStore } from './deckStore';
import type { PageData } from './usePDFExport';
import type { CardShape } from '../types';
import { pts2plotter } from '../../../plotcutter';

export interface UsePlotterExportReturn {
  exportToPlt: (pages: PageData[]) => void;
}

/**
 * 根据形状生成卡片轮廓点（单位：mm，相对于卡片左下角）
 */
function getCardShapePoints(
  shape: CardShape,
  width: number,
  height: number
): [number, number][] {
  const points: [number, number][] = [];

  switch (shape) {
    case 'circle': {
      // 圆形：生成 36 个点近似圆
      const radius = Math.min(width, height) / 2;
      const centerX = width / 2;
      const centerY = height / 2;
      for (let i = 0; i < 36; i++) {
        const angle = (i / 36) * Math.PI * 2;
        points.push([
          centerX + radius * Math.cos(angle),
          centerY + radius * Math.sin(angle)
        ]);
      }
      break;
    }
    case 'triangle': {
      // 正三角形：顶点向上
      points.push([width / 2, 0]);
      points.push([0, height]);
      points.push([width, height]);
      break;
    }
    case 'hexagon': {
      // 六边形：尖顶向上
      const halfW = width / 2;
      const quarterH = height / 4;
      points.push([halfW, 0]);
      points.push([width, quarterH]);
      points.push([width, height - quarterH]);
      points.push([halfW, height]);
      points.push([0, height - quarterH]);
      points.push([0, quarterH]);
      break;
    }
    case 'rectangle':
    default: {
      // 矩形：顺时针方向
      points.push([0, 0]);
      points.push([width, 0]);
      points.push([width, height]);
      points.push([0, height]);
      break;
    }
  }

  return points;
}

/**
 * PLT 导出 hook - 生成 HPGL 格式文件并下载
 */
export function usePlotterExport(store: DeckStore): UsePlotterExportReturn {
  const exportToPlt = (pages: PageData[]) => {
    const cardWidth = store.state.dimensions?.cardWidth || 56;
    const cardHeight = store.state.dimensions?.cardHeight || 88;
    const shape = store.state.shape;

    // 计算所有页面的总尺寸
    const a4Width = 297; // 横向 A4
    const a4Height = 210;

    // 收集所有卡片的轮廓点
    const allPaths: [number, number][][] = [];

    for (const page of pages) {
      for (const card of page.cards) {
        // 只导出正面
        if (card.side !== 'front') continue;

        // 获取卡片形状点（相对于卡片原点）
        const shapePoints = getCardShapePoints(shape, cardWidth, cardHeight);

        // 转换点到页面坐标（Y 轴翻转：SVG Y 向下，plotter Y 向上）
        const pagePoints = shapePoints.map(([x, y]) => [
          card.x + x,
          a4Height - (card.y + y)
        ] as [number, number]);

        allPaths.push(pagePoints);
      }
    }

    if (allPaths.length === 0) {
      alert('没有可导出的卡片');
      return;
    }

    // 生成 HPGL 指令
    const plotterCode = pts2plotter(allPaths, a4Width, a4Height, 1);

    // 创建 Blob 并下载
    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);
  };

  return { exportToPlt };
}