// ============================================================
// preload/canvas.ts — 无限画布 API
//
// 提供画布窗口、文件扫描、缩略图、拖拽等接口
// 渲染进程通过 window.canvas 调用
// ============================================================

import { ipcRenderer, contextBridge } from 'electron';
import { BIDIRECTIONAL, RENDERER_TO_MAIN } from '../../shared/constants/ipc';

/** 无限画布 API */
export function exposeCanvas(): void {
   contextBridge.exposeInMainWorld('canvas', {
      /** 打开画布窗口（主进程创建新 BrowserWindow） */
      openWindow(projectPath?: string): void {
         ipcRenderer.send(RENDERER_TO_MAIN.OPEN_CANVAS_WINDOW, { projectPath });
      },

      /** 扫描目录，返回匹配的文件列表 */
      scanDirectory(params: {
         roots: string[];
         extensions: string[];
         recursive: boolean;
      }): Promise<{
         success: boolean;
         data: Array<{ path: string; fileName: string; ext: string; fileSize: number; modifiedAt: string }>;
         error?: string;
      }> {
         return ipcRenderer.invoke(BIDIRECTIONAL.CANVAS_SCAN_DIRECTORY, params);
      },

      /** 扫描项目（主进程内部完成 buildScanRoots + walkDirectory，推荐使用） */
      scanProject(params: {
         projectPath: string;
         stage: string;
         assetTypeFilter: string;
         shotQuery: string;
      }): Promise<{
         success: boolean;
         data: Array<{ path: string; fileName: string; ext: string; fileSize: number; modifiedAt: string }>;
         error?: string;
      }> {
         return ipcRenderer.invoke(BIDIRECTIONAL.CANVAS_SCAN_PROJECT, params);
      },

      /** 读取旁加载 JSON 元数据 */
      readSidecar(params: { filePath: string }): Promise<{ success: boolean; data: object | null }> {
         return ipcRenderer.invoke(BIDIRECTIONAL.CANVAS_READ_SIDECAR, params);
      },

      /** 写入旁加载 JSON 元数据 */
      writeSidecar(params: { filePath: string; metadata: object }): Promise<{ success: boolean; error?: string }> {
         return ipcRenderer.invoke(BIDIRECTIONAL.CANVAS_WRITE_SIDECAR, params);
      },

      /** 生成缩略图（JPEG base64） */
      generateThumbnail(params: { filePath: string; size: number }): Promise<{
         success: boolean;
         data: { data: string; mimeType: string; width: number; height: number };
         error?: string;
      }> {
         return ipcRenderer.invoke(BIDIRECTIONAL.CANVAS_GENERATE_THUMBNAIL, params);
      },

      /** 复制文件到目标目录（导入操作） */
      copyFile(params: { src: string; destDir: string; fileName: string }): Promise<{
         success: boolean;
         data: string;
         error?: string;
      }> {
         return ipcRenderer.invoke(BIDIRECTIONAL.CANVAS_COPY_FILE, params);
      },

      /** 列出目录下的子文件夹（非递归，排除隐藏） */
      listSubdirs(params: { parentPath: string }): Promise<{ success: boolean; data: string[]; error?: string }> {
         return ipcRenderer.invoke(BIDIRECTIONAL.CANVAS_LIST_SUBDIRS, params);
      },

      /** 扫描阶段文件（单个 episode/shot/stage 组合） */
      scanStageFiles(params: { projectPath: string; episode: string; shot: string; stage: string }): Promise<{
         success: boolean;
         data: Array<{ path: string; fileName: string; ext: string; fileSize: number; modifiedAt: string }>;
         error?: string;
      }> {
         return ipcRenderer.invoke(BIDIRECTIONAL.CANVAS_SCAN_STAGE_FILES, params);
      },

      /** 扫描资产文件（深度递归扫描 assets/ 目录） */
      scanAssetFiles(params: { projectPath: string; assetTypeFilter: string }): Promise<{
         success: boolean;
         data: Array<{ path: string; fileName: string; ext: string; fileSize: number; modifiedAt: string }>;
         error?: string;
      }> {
         return ipcRenderer.invoke(BIDIRECTIONAL.CANVAS_SCAN_ASSET_FILES, params);
      },

      /** 创建目录 */
      createDirectory(params: { parentPath: string; dirName: string }): Promise<{
         success: boolean;
         data: string;
         error?: string;
      }> {
         return ipcRenderer.invoke(BIDIRECTIONAL.CANVAS_CREATE_DIRECTORY, params);
      },

      /** 将本地文件路径转换为可通过 local-media:// 协议加载的 URL */
      getMediaUrl(filePath: string): string {
         const normalized = filePath.replace(/\\/g, '/');
         // UNC 路径（//server/share/…）开头 // 会被 URL 解析器视为 authority，
         // 必须用 local-media://<host>/<path> 格式而非 local-media:/// 前缀
         if (normalized.startsWith('//')) {
            // normalized = "//192.168.110.250/share/path"
            return 'local-media://' + normalized.slice(2);
         }
         // 本地路径：C:/path → local-media:///C:/path
         return 'local-media:///' + normalized;
      },

      /** 启动原生文件拖拽（从缩略图拖放媒体文件到外部应用） */
      startDrag(params: { filePath: string; fileName: string }): Promise<{ success: boolean; error?: string }> {
         return ipcRenderer.invoke(BIDIRECTIONAL.CANVAS_START_DRAG, params);
      },
   });
}