import 'dart:io';
import 'dart:typed_data';
import 'package:autosos_flutter/provider/providers.dart';
import 'package:autosos_flutter/util/toast.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';
import 'package:path_provider/path_provider.dart';
import 'package:signature/signature.dart';
import 'package:uuid/uuid.dart';

/// 客户签字页（对应 Android AutographActivity）
class AutographPage extends ConsumerStatefulWidget {
  final int orderId;
  const AutographPage({super.key, required this.orderId});

  @override
  ConsumerState<AutographPage> createState() => _AutographPageState();
}

class _AutographPageState extends ConsumerState<AutographPage> {
  late final SignatureController _sigCtrl;
  bool _submitting = false;

  @override
  void initState() {
    super.initState();
    _sigCtrl = SignatureController(
      penStrokeWidth: 3,
      penColor: Colors.black,
      exportBackgroundColor: Colors.white,
    );
  }

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

  Future<void> _submit() async {
    if (_sigCtrl.isEmpty) {
      Toast.error('请先签名');
      return;
    }
    setState(() => _submitting = true);
    EasyLoading.show(status: '上传中…');
    try {
      // 1) 导出 PNG 字节
      final Uint8List? bytes = await _sigCtrl.toPngBytes();
      if (bytes == null) throw '导出签名失败';
      // 2) 落盘到缓存
      final dir = await getTemporaryDirectory();
      final file = File(
        '${dir.path}/sig_${const Uuid().v4()}.png',
      );
      await file.writeAsBytes(bytes, flush: true);
      // 3) 走七牛
      final url =
          await ref.read(uploadServiceProvider).upload(file.path);
      // 4) 通知后端
      final resp = await ref
          .read(orderApiProvider)
          .uploadSignature(widget.orderId, url);
      EasyLoading.dismiss();
      if (!resp.isSuccess) {
        Toast.error(resp.message ?? '保存失败');
        return;
      }
      Toast.success('签字已保存');
      if (mounted) context.pop(true);
    } catch (e) {
      EasyLoading.dismiss();
      Toast.error('上传失败：$e');
    } finally {
      if (mounted) setState(() => _submitting = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('客户签字'),
        actions: [
          TextButton(
            onPressed: () => _sigCtrl.clear(),
            child: const Text('清除',
                style: TextStyle(color: Colors.white)),
          ),
        ],
      ),
      body: Column(
        children: [
          Container(
            color: Colors.amber.shade50,
            padding: const EdgeInsets.all(12),
            width: double.infinity,
            child: const Text(
              '请客户在下方手写签字，确认本次救援服务内容与费用',
              style: TextStyle(color: Colors.brown, fontSize: 13),
            ),
          ),
          Expanded(
            child: Container(
              color: Colors.white,
              margin: const EdgeInsets.all(12),
              child: ClipRRect(
                borderRadius: BorderRadius.circular(8),
                child: Signature(
                  controller: _sigCtrl,
                  backgroundColor: Colors.white,
                ),
              ),
            ),
          ),
          Padding(
            padding: const EdgeInsets.all(12),
            child: SizedBox(
              width: double.infinity,
              child: ElevatedButton(
                onPressed: _submitting ? null : _submit,
                style: ElevatedButton.styleFrom(
                  backgroundColor: Theme.of(context).primaryColor,
                  minimumSize: const Size.fromHeight(48),
                ),
                child: Text(_submitting ? '提交中…' : '确认提交签字'),
              ),
            ),
          ),
        ],
      ),
    );
  }
}