// ============================================================
// canvas/index.ts — 画布 IPC 处理器注册
//
// 职责：
//   - 注册所有画布相关的 IPC 处理器
//   - 组合使用各工具模块实现业务逻辑
// ============================================================

import { ipcMain } from 'electron';
import fs from 'node:fs';
import path from 'node:path';
import sharp from 'sharp';
import { BIDIRECTIONAL_CANVAS } from '../../../../shared/constants/ipc/canvas';
import { logger } from '../../logger';
import { walkDirectory } from './walk';
import { readSidecarFile, writeSidecarFile } from './sidecar';
import { generateCanvasThumbnail } from './thumbnail';
import { buildScanRoots, getStageExtensions } from './scan-roots';
import type { StageType, AssetTypeFilter } from './types';

/** 注册画布 IPC 处理器 */
export function registerCanvasIpcHandlers(): void {
   // ---- 扫描项目（主进程内部 buildScanRoots + walkDirectory） ----
   ipcMain.handle(
      BIDIRECTIONAL_CANVAS.CANVAS_SCAN_PROJECT,
      async (
         _event,
         params: {
            projectPath: string;
            stage: StageType;
            assetTypeFilter: AssetTypeFilter;
            shotQuery: string;
         },
      ) => {
         try {
            logger.info('canvas', '收到 CANVAS_SCAN_PROJECT', params);

            const roots = buildScanRoots(params);
            const extensions = getStageExtensions(params.stage);

            logger.info('canvas', `buildScanRoots 结果：${roots.length} 个扫描根`, {
               roots: roots.length <= 10 ? roots : roots.slice(0, 10).concat(`... 共 ${roots.length} 个`),
               extensions,
               stage: params.stage,
            });

            if (roots.length === 0) {
               logger.warn('canvas', '扫描根目录为空', undefined, {
                  projectPath: params.projectPath,
                  stage: params.stage,
                  shotQuery: params.shotQuery || '(无)',
               });
               return { success: true, data: [] };
            }

            const allResults: Array<{
               path: string;
               fileName: string;
               ext: string;
               fileSize: number;
               modifiedAt: string;
            }> = [];

            for (const root of roots) {
               const results = walkDirectory(root, extensions, true);
               if (results.length > 0) {
                  logger.info('canvas', `  📁 ${root} → ${results.length} 个文件`);
               }
               allResults.push(...results);
            }

            logger.info(
               'canvas',
               `扫描项目完成：${allResults.length} 个文件（${roots.length} 个扫描根目录，阶段：${params.stage}）`,
            );
            return { success: true, data: allResults };
         } catch (err) {
            const msg = (err as Error).message;
            logger.warn('canvas', '项目扫描失败', err instanceof Error ? err : undefined);
            return { success: false, error: msg };
         }
      },
   );

   // ---- 目录扫描（保留低级 API：外部提供扫描根） ----
   ipcMain.handle(
      BIDIRECTIONAL_CANVAS.CANVAS_SCAN_DIRECTORY,
      async (
         _event,
         params: { roots: string[]; extensions: string[]; recursive: boolean },
      ) => {
         try {
            const allResults: Array<{
               path: string;
               fileName: string;
               ext: string;
               fileSize: number;
               modifiedAt: string;
            }> = [];
            for (const root of params.roots) {
               if (!fs.existsSync(root)) {
                  logger.warn('canvas', `扫描根目录不存在，跳过：${root}`);
                  continue;
               }
               const results = walkDirectory(root, params.extensions, params.recursive);
               allResults.push(...results);
            }
            logger.info(
               'canvas',
               `扫描完成：${allResults.length} 个文件（${params.roots.length} 个根目录）`,
            );
            return { success: true, data: allResults };
         } catch (err) {
            const msg = (err as Error).message;
            logger.warn('canvas', '目录扫描失败', err instanceof Error ? err : undefined);
            return { success: false, error: msg };
         }
      },
   );

   // ---- 读取 sidecar ----
   ipcMain.handle(
      BIDIRECTIONAL_CANVAS.CANVAS_READ_SIDECAR,
      async (_event, params: { filePath: string }) => {
         try {
            const data = readSidecarFile(params.filePath);
            return { success: true, data };
         } catch (err) {
            logger.warn('canvas', '读取 sidecar 失败', err instanceof Error ? err : undefined);
            return { success: false, error: (err as Error).message };
         }
      },
   );

   // ---- 写入 sidecar ----
   ipcMain.handle(
      BIDIRECTIONAL_CANVAS.CANVAS_WRITE_SIDECAR,
      async (_event, params: { filePath: string; metadata: object }) => {
         try {
            writeSidecarFile(params.filePath, params.metadata);
            return { success: true };
         } catch (err) {
            logger.warn('canvas', '写入 sidecar 失败', err instanceof Error ? err : undefined);
            return { success: false, error: (err as Error).message };
         }
      },
   );

   // ---- 生成缩略图 ----
   ipcMain.handle(
      BIDIRECTIONAL_CANVAS.CANVAS_GENERATE_THUMBNAIL,
      async (_event, params: { filePath: string; size: number }) => {
         try {
            const result = await generateCanvasThumbnail(params.filePath, params.size);
            return { success: true, data: result };
         } catch (err) {
            logger.warn('canvas', '生成缩略图失败', err instanceof Error ? err : undefined);
            return { success: false, error: (err as Error).message };
         }
      },
   );

   // ---- 复制文件 ----
   ipcMain.handle(
      BIDIRECTIONAL_CANVAS.CANVAS_COPY_FILE,
      async (_event, params: { src: string; destDir: string; fileName: string }) => {
         try {
            if (!fs.existsSync(params.destDir)) {
               fs.mkdirSync(params.destDir, { recursive: true });
            }
            const dest = path.join(params.destDir, params.fileName);
            fs.copyFileSync(params.src, dest);
            return { success: true, data: dest };
         } catch (err) {
            logger.warn('canvas', '复制文件失败', err instanceof Error ? err : undefined);
            return { success: false, error: (err as Error).message };
         }
      },
   );

   // ---- 获取图片尺寸（使用 sharp） ----
   ipcMain.handle(
      BIDIRECTIONAL_CANVAS.CANVAS_GET_IMAGE_SIZE,
      async (_event, params: { filePath: string }) => {
         try {
            if (sharp) {
               const metadata = await sharp(params.filePath).metadata();
               return {
                  success: true,
                  data: {
                     width: metadata.width || 0,
                     height: metadata.height || 0,
                  },
               };
            }
            return { success: false, error: 'sharp 未安装，无法获取图片尺寸' };
         } catch (err) {
            logger.warn('canvas', '获取图片尺寸失败', err instanceof Error ? err : undefined);
            return { success: false, error: (err as Error).message };
         }
      },
   );

   // ---- 列出子文件夹（非递归，排除隐藏） ----
   ipcMain.handle(
      BIDIRECTIONAL_CANVAS.CANVAS_LIST_SUBDIRS,
      async (_event, params: { parentPath: string }) => {
         try {
            if (!fs.existsSync(params.parentPath)) {
               logger.info('canvas', `listSubdirs: 路径不存在，返回空数组 — ${params.parentPath}`);
               return { success: true, data: [] };
            }
            const entries = fs.readdirSync(params.parentPath, { withFileTypes: true });
            const dirs = entries
               .filter((e) => e.isDirectory() && !e.name.startsWith('.'))
               .map((e) => e.name);
            logger.info('canvas', `listSubdirs: ${dirs.length} 个子文件夹 — ${params.parentPath}`);
            return { success: true, data: dirs };
         } catch (err) {
            logger.warn('canvas', 'listSubdirs 失败', err instanceof Error ? err : undefined);
            return { success: false, error: (err as Error).message };
         }
      },
   );

   // ---- 扫描阶段文件 ----
   ipcMain.handle(
      BIDIRECTIONAL_CANVAS.CANVAS_SCAN_STAGE_FILES,
      async (
         _event,
         params: {
            projectPath: string;
            episode: string;
            shot: string;
            stage: string;
         },
      ) => {
         try {
            const stageDir = path.join(
               params.projectPath,
               'shots',
               params.episode,
               params.shot,
               params.stage,
            );
            logger.info('canvas', `scanStageFiles: ${stageDir}`);
            if (!fs.existsSync(stageDir)) {
               logger.info('canvas', `scanStageFiles: 阶段目录不存在 — ${stageDir}`);
               return { success: true, data: [] };
            }
            const extensions = getStageExtensions(params.stage as StageType);
            const results = walkDirectory(stageDir, extensions, true);
            logger.info('canvas', `scanStageFiles: ${results.length} 个文件 — ${stageDir}`);
            return { success: true, data: results };
         } catch (err) {
            logger.warn('canvas', 'scanStageFiles 失败', err instanceof Error ? err : undefined);
            return { success: false, error: (err as Error).message };
         }
      },
   );

   // ---- 扫描资产文件（深度递归） ----
   ipcMain.handle(
      BIDIRECTIONAL_CANVAS.CANVAS_SCAN_ASSET_FILES,
      async (
         _event,
         params: { projectPath: string; assetTypeFilter: string },
      ) => {
         try {
            let assetsDir: string;
            switch (params.assetTypeFilter) {
               case '角色':
                  assetsDir = path.join(params.projectPath, 'assets', 'chr');
                  break;
               case '道具':
                  assetsDir = path.join(params.projectPath, 'assets', 'prp');
                  break;
               case '场景':
                  assetsDir = path.join(params.projectPath, 'assets', 'set');
                  break;
               default:
                  assetsDir = path.join(params.projectPath, 'assets');
            }
            logger.info('canvas', `scanAssetFiles: ${assetsDir} (filter=${params.assetTypeFilter})`);
            if (!fs.existsSync(assetsDir)) {
               logger.info('canvas', `scanAssetFiles: 资产目录不存在 — ${assetsDir}`);
               return { success: true, data: [] };
            }
            // 资产深度递归：图片 + 视频
            const extensions = ['jpg', 'jpeg', 'png', 'webp', 'bmp', 'gif', 'mp4', 'webm'];
            const results = walkDirectory(assetsDir, extensions, true);
            logger.info('canvas', `scanAssetFiles: ${results.length} 个文件 — ${assetsDir}`);
            return { success: true, data: results };
         } catch (err) {
            logger.warn('canvas', 'scanAssetFiles 失败', err instanceof Error ? err : undefined);
            return { success: false, error: (err as Error).message };
         }
      },
   );

   // ---- 创建目录 ----
   ipcMain.handle(
      BIDIRECTIONAL_CANVAS.CANVAS_CREATE_DIRECTORY,
      async (_event, params: { parentPath: string; dirName: string }) => {
         try {
            // 安全校验：拒绝包含危险字符的名称
            const dangerous = /[/\\:*?"<>|]/;
            if (!params.dirName || dangerous.test(params.dirName)) {
               return {
                  success: false,
                  error: `无效的目录名: "${params.dirName}"`,
               };
            }
            const fullPath = path.join(params.parentPath, params.dirName);
            if (fs.existsSync(fullPath)) {
               return { success: false, error: `目录已存在: ${fullPath}` };
            }
            fs.mkdirSync(fullPath);
            logger.info('canvas', `createDirectory: ${fullPath}`);
            return { success: true, data: fullPath };
         } catch (err) {
            logger.warn('canvas', 'createDirectory 失败', err instanceof Error ? err : undefined);
            return { success: false, error: (err as Error).message };
         }
      },
   );

   // ---- 启动原生文件拖拽（拖放到 Photoshop/Explorer 等外部应用） ----
   ipcMain.handle(
      BIDIRECTIONAL_CANVAS.CANVAS_START_DRAG,
      async (_event, params: { filePath: string; fileName: string }) => {
         try {
            if (!fs.existsSync(params.filePath)) {
               logger.warn('canvas', `startDrag: 文件不存在 — ${params.filePath}`);
               return { success: false, error: '文件不存在' };
            }
            _event.sender.startDrag({
               file: params.filePath,
               icon: params.filePath,
            });
            logger.info('canvas', `startDrag: 已启动 — ${params.fileName}`);
            return { success: true };
         } catch (err) {
            const msg = (err as Error).message;
            logger.warn('canvas', 'startDrag 失败', err instanceof Error ? err : undefined);
            return { success: false, error: msg };
         }
      },
   );

   logger.info('canvas', '画布 IPC 处理器已注册（完整实现）');
}