import 'dart:io';
import 'package:autosos_flutter/provider/providers.dart';
import 'package:autosos_flutter/util/toast.dart';
import 'package:autosos_flutter/widget/photo_grid_picker.dart';
import 'package:flutter/material.dart';
import 'package:flutter_easyloading/flutter_easyloading.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';

/// 拍照取证页（对应 Android CheckPhotoActivity）
/// 自定义相机 + 照片队列 + 备注 + 上传
class PhotographPage extends ConsumerStatefulWidget {
  final int orderId;
  const PhotographPage({super.key, required this.orderId});

  @override
  ConsumerState<PhotographPage> createState() => _PhotographPageState();
}

class _PhotographPageState extends ConsumerState<PhotographPage> {
  final List<String> _localPaths = [];
  final TextEditingController _remarkCtrl = TextEditingController();
  bool _showCamera = false;
  bool _uploading = false;

  @override
  void dispose() {
    _remarkCtrl.dispose();
    super.dispose();
  }

  void _onCaptured(String path) {
    setState(() {
      _localPaths.add(path);
      // 拍到一张后自动收起相机，让用户确认后再拍
      _showCamera = false;
    });
  }

  Future<void> _pickFromAlbum() async {
    final files = await AlbumPicker.pick();
    if (files.isEmpty) return;
    setState(() => _localPaths.addAll(files));
  }

  Future<void> _submit() async {
    if (_localPaths.isEmpty) {
      Toast.error('请先拍照');
      return;
    }
    setState(() => _uploading = true);
    EasyLoading.show(status: '上传中…');
    try {
      // 1) 走七牛
      final urls = await ref
          .read(uploadServiceProvider)
          .uploadBatch(_localPaths);
      // 2) 通知后端
      final resp = await ref
          .read(orderApiProvider)
          .uploadPhotos(widget.orderId, urls);
      EasyLoading.dismiss();
      if (!resp.isSuccess) {
        Toast.error(resp.message ?? '保存失败');
        return;
      }
      Toast.success('已上传 ${urls.length} 张照片');
      if (mounted) context.pop(true);
    } catch (e) {
      EasyLoading.dismiss();
      Toast.error('上传失败：$e');
    } finally {
      if (mounted) setState(() => _uploading = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.black,
      appBar: AppBar(
        backgroundColor: Colors.black,
        title: const Text('拍照取证'),
        iconTheme: const IconThemeData(color: Colors.white),
      ),
      body: SafeArea(
        child: Column(
          children: [
            // 备注
            Container(
              color: Colors.white,
              padding: const EdgeInsets.all(12),
              child: TextField(
                controller: _remarkCtrl,
                maxLines: 2,
                decoration: const InputDecoration(
                  hintText: '可填写现场情况描述（选填）',
                  border: OutlineInputBorder(),
                ),
              ),
            ),
            Expanded(
              child: _showCamera
                  ? CameraView(onCaptured: _onCaptured)
                  : _photoList(),
            ),
            // 底部按钮区
            Container(
              color: Colors.white,
              padding: const EdgeInsets.all(8),
              child: Column(
                children: [
                  PhotoThumbStrip(
                    paths: _localPaths,
                    onAdd: () => setState(() => _showCamera = true),
                    onRemove: (i) =>
                        setState(() => _localPaths.removeAt(i)),
                  ),
                  Row(
                    children: [
                      Expanded(
                        child: OutlinedButton.icon(
                          onPressed: _showCamera
                              ? null
                              : () =>
                                  setState(() => _showCamera = true),
                          icon: const Icon(Icons.camera_alt),
                          label: const Text('拍照'),
                        ),
                      ),
                      const SizedBox(width: 8),
                      Expanded(
                        child: OutlinedButton.icon(
                          onPressed: _showCamera
                              ? null
                              : _pickFromAlbum,
                          icon: const Icon(Icons.photo_library),
                          label: const Text('相册'),
                        ),
                      ),
                      const SizedBox(width: 8),
                      Expanded(
                        flex: 2,
                        child: ElevatedButton.icon(
                          onPressed: _uploading ? null : _submit,
                          icon: const Icon(Icons.cloud_upload),
                          label: Text(
                            _uploading
                                ? '上传中…'
                                : '完成(${_localPaths.length})',
                          ),
                          style: ElevatedButton.styleFrom(
                            backgroundColor:
                                Theme.of(context).primaryColor,
                          ),
                        ),
                      ),
                    ],
                  ),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }

  Widget _photoList() {
    if (_localPaths.isEmpty) {
      return Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: const [
            Icon(Icons.photo_camera,
                size: 80, color: Colors.white24),
            SizedBox(height: 8),
            Text('点击下方"拍照"开始取证',
                style: TextStyle(color: Colors.white54)),
          ],
        ),
      );
    }
    return GridView.builder(
      padding: const EdgeInsets.all(8),
      gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
        crossAxisCount: 3,
        crossAxisSpacing: 8,
        mainAxisSpacing: 8,
      ),
      itemCount: _localPaths.length,
      itemBuilder: (ctx, i) => Stack(
        children: [
          Positioned.fill(
            child: ClipRRect(
              borderRadius: BorderRadius.circular(6),
              child: Image.file(
                File(_localPaths[i]),
                fit: BoxFit.cover,
              ),
            ),
          ),
          Positioned(
            top: 2,
            right: 2,
            child: GestureDetector(
              onTap: () => setState(() => _localPaths.removeAt(i)),
              child: Container(
                decoration: const BoxDecoration(
                  color: Colors.black54,
                  shape: BoxShape.circle,
                ),
                padding: const EdgeInsets.all(2),
                child: const Icon(
                  Icons.close,
                  size: 14,
                  color: Colors.white,
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }
}