YYHome/packages/cs_plugin_platform/lib/engine/image/image_preview.dart

import 'package:flutter/material.dart';
import 'package:image_preview/preview.dart';
import 'package:image_preview/preview_data.dart';
import 'package:shared/utils/date_time_utils.dart';
import 'package:shared/utils/util.dart';

import '../directory/directory_util.dart';

class ImagePreviewEngine {
  /// 单图的预览
  static void singleImagePreview(
    BuildContext context,
    String url, {
    String? heroTag,
    void Function(String? url)? onLongPressAction,
    Widget? Function(int index)? tipWidget,
  }) {
    String path;

    // 根据URL类型处理路径
    if (isNetworkUrl(url)) {
      // 从URL中提取文件名
      String fileName = extractFileName(url);
      // 生成保存路径
      path = DirectoryUtil.getTempPath(category: 'Pictures', fileName: fileName) ?? "";
    } else {
      // 如果是本地路径，直接使用URL作为路径
      path = url;
    }

    // 调用预览页面
    openPreviewPage(
      Navigator.of(context),
      data: PreviewData(
        type: Type.image,
        heroTag: heroTag ?? '',
        image: ImageData(
          url: url,
          path: path,
        ),
      ),
      tipWidget: tipWidget,
      onLongPressHandler: (context, data) {
        onLongPressAction?.call(data.image?.url);
      },
    );
  }

  /// 多图的预览
  static void multipleImagePreview(
    BuildContext context,
    List<String?> urls, {
    List<String>? heroes,
    void Function(String? url)? onLongPressAction,
    void Function(int index)? onPageChanged,
    Widget? Function(int index)? tipWidget,
  }) {
    // 过滤掉 null 值的 URL
    List<String> filteredUrls = urls.where((url) => url != null).cast<String>().toList();

    List<PreviewData> previewDataList = filteredUrls.asMap().entries.map((entry) {
      int index = entry.key;
      String url = entry.value;

      String path;
      if (isNetworkUrl(url)) {
        String fileName = extractFileName(url);
        path = DirectoryUtil.getTempPath(category: 'Pictures', fileName: fileName) ?? "";
      } else {
        path = url;
      }

      return PreviewData(
        type: Type.image,
        heroTag: heroes != null && heroes.length > index ? heroes[index] : index.toString(),
        image: ImageData(
          url: url,
          path: path,
        ),
      );
    }).toList();

    // 调用预览页面
    openPreviewPages(
      Navigator.of(context),
      data: previewDataList,
      tipWidget: tipWidget,
      onPageChanged: onPageChanged,
      onLongPressHandler: (context, data) {
        onLongPressAction?.call(data.image?.url);
      },
    );
  }

  /// 工具函数：从URL提取文件名
  static String extractFileName(String url) {
    // 检查是否包含 '/'
    if (!url.contains('/')) {
      return DateTimeUtils.getNowDateMs().toString();
    }

    // 获取最后一个 '/' 后的部分
    String fileName = url.split('/').last;

    // 检查是否包含 '.'
    if (Utils.isEmpty(fileName)) {
      return DateTimeUtils.getNowDateMs().toString();
    }
    return fileName;
  }

  /// 工具函数：判断是否为网络URL
  static bool isNetworkUrl(String url) {
    return url.startsWith('http://') || url.startsWith('https://');
  }
}