import 'dart:io';
import 'package:flutter/material.dart';
import 'package:extended_image/extended_image.dart';
import 'package:get/get.dart';

/// 图片查看器页面
class ImageViewerPage extends StatelessWidget {
  final String? imageUrl;
  final String? imagePath;

  const ImageViewerPage({
    this.imageUrl,
    this.imagePath,
    super.key,
  });

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.black,
      body: Stack(
        children: [
          // 图片查看区域
          Center(
            child: _buildImage(),
          ),
          // 关闭按钮
          Positioned(
            top: MediaQuery.of(context).padding.top + 10,
            right: 16,
            child: GestureDetector(
              onTap: () => Get.back(),
              child: Container(
                padding: const EdgeInsets.all(8),
                decoration: BoxDecoration(
                  color: Colors.black.withOpacity(0.5),
                  shape: BoxShape.circle,
                ),
                child: const Icon(
                  Icons.close,
                  color: Colors.white,
                  size: 24,
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildImage() {
    // 本地图片
    if (imagePath != null && imagePath!.isNotEmpty) {
      return ExtendedImage.file(
        File(imagePath!),
        fit: BoxFit.contain,
        mode: ExtendedImageMode.gesture,
        initGestureConfigHandler: (state) {
          return GestureConfig(
            minScale: 0.9,
            animationMinScale: 0.7,
            maxScale: 3.0,
            animationMaxScale: 3.5,
            speed: 1.0,
            inertialSpeed: 100.0,
            initialScale: 1.0,
            inPageView: false,
            initialAlignment: InitialAlignment.center,
          );
        },
        loadStateChanged: (state) {
          switch (state.extendedImageLoadState) {
            case LoadState.loading:
              return const Center(
                child: CircularProgressIndicator(
                  color: Colors.white,
                ),
              );
            case LoadState.completed:
              return null; // 返回 null 显示图片
            case LoadState.failed:
              return const Center(
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: [
                    Icon(
                      Icons.error_outline,
                      color: Colors.white,
                      size: 48,
                    ),
                    SizedBox(height: 16),
                    Text(
                      '图片加载失败',
                      style: TextStyle(color: Colors.white),
                    ),
                  ],
                ),
              );
          }
        },
      );
    }

    // 网络图片
    if (imageUrl != null && imageUrl!.isNotEmpty) {
      return ExtendedImage.network(
        imageUrl!,
        fit: BoxFit.contain,
        mode: ExtendedImageMode.gesture,
        cache: true,
        initGestureConfigHandler: (state) {
          return GestureConfig(
            minScale: 0.9,
            animationMinScale: 0.7,
            maxScale: 3.0,
            animationMaxScale: 3.5,
            speed: 1.0,
            inertialSpeed: 100.0,
            initialScale: 1.0,
            inPageView: false,
            initialAlignment: InitialAlignment.center,
          );
        },
        loadStateChanged: (state) {
          switch (state.extendedImageLoadState) {
            case LoadState.loading:
              return Center(
                child: CircularProgressIndicator(
                  color: Colors.white,
                  value: state.loadingProgress?.expectedTotalBytes != null
                      ? state.loadingProgress!.cumulativeBytesLoaded /
                          state.loadingProgress!.expectedTotalBytes!
                      : null,
                ),
              );
            case LoadState.completed:
              return null; // 返回 null 显示图片
            case LoadState.failed:
              return const Center(
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: [
                    Icon(
                      Icons.error_outline,
                      color: Colors.white,
                      size: 48,
                    ),
                    SizedBox(height: 16),
                    Text(
                      '图片加载失败',
                      style: TextStyle(color: Colors.white),
                    ),
                  ],
                ),
              );
          }
        },
      );
    }

    // 没有图片时显示错误
    return const Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Icon(
            Icons.image_not_supported,
            color: Colors.white,
            size: 48,
          ),
          SizedBox(height: 16),
          Text(
            '没有可显示的图片',
            style: TextStyle(color: Colors.white),
          ),
        ],
      ),
    );
  }
}