套索（Lasso）

import { PluginCommAPI, PluginNoteAPI } from 'sn-plugin-lib';

type Rect = { left: number; top: number; right: number; bottom: number };

/**
 * 获取当前套索框矩形。
 */
export async function fetchLassoRect(): Promise<Rect> {
  const res = await PluginCommAPI.getLassoRect();
  if (!res?.success || !res.result) {
    throw new Error(res?.error?.message ?? '获取套索框失败');
  }
  return res.result as Rect;
}

/**
 * 以中心点为基准，按等比例缩放生成新 Rect。
 */
export function scaleRectKeepAspect(rect: Rect, scale: number): Rect {
  const width = rect.right - rect.left;
  const height = rect.bottom - rect.top;
  const cx = rect.left + width / 2;
  const cy = rect.top + height / 2;
  const newWidth = width * scale;
  const newHeight = height * scale;

  return {
    left: cx - newWidth / 2,
    top: cy - newHeight / 2,
    right: cx + newWidth / 2,
    bottom: cy + newHeight / 2,
  };
}

/**
 * 将套索框按等比例缩放并提交调整。
 */
export async function resizeLassoRectByScale(scale: number): Promise<boolean> {
  const rect = await fetchLassoRect();
  const nextRect = scaleRectKeepAspect(rect, scale);
  const res = await PluginCommAPI.resizeLassoRect(nextRect);
  return !!res?.success && !!res.result;
}

/**
 * 获取套索元素并示例性地做按类型分流。
 */
export async function fetchLassoElementsAndDispatch(): Promise<void> {
  const res = (await PluginCommAPI.getLassoElements()) as any;
  if (!res?.success || !Array.isArray(res.result)) {
    throw new Error(res?.error?.message ?? '获取套索元素失败');
  }

  const elements = res.result as any[];
  for (const el of elements) {
    if (el.type === 100) {
      await PluginNoteAPI.modifyLassoTitle({ style: 1 });
    } else if (el.type === 500 || el.type === 501 || el.type === 502) {
      const textBox = el.textBox;
      if (textBox) {
        await PluginNoteAPI.modifyLassoText({ ...textBox, textContentFull: 'Updated by plugin' });
      }
    } else if (el.type === 700) {
      const geometry = el.geometry;
      if (geometry) {
        await PluginCommAPI.modifyLassoGeometry(geometry);
      }
    } else if (el.type === 800) {
      const fiveStar = el.fiveStar;
      if (fiveStar?.points) {
        void fiveStar.points;
      }
    }
  }
}

/**
 * 控制套索框显示状态。
 * - 0: 显示
 * - 1: 隐藏
 * - 2: 完全移除
 */
export async function setLassoBoxState(state: 0 | 1 | 2): Promise<boolean> {
  const res = await PluginCommAPI.setLassoBoxState(state);
  return !!res?.success && !!res.result;
}