import 'package:flutter/material.dart';
import 'package:yx_tracking_flutter/yx_tracking_flutter.dart';

import '../service/analytics_service.dart';
import '../view_model/demo_view_model.dart';
import 'widgets.dart';

class DemoPage extends StatefulWidget {
  const DemoPage({super.key, required this.initialConfig});

  final AnalyticsConfig initialConfig;

  @override
  State<DemoPage> createState() => _DemoPageState();
}

class _DemoPageState extends State<DemoPage> {
  late DemoViewModel _viewModel;
  final TextEditingController _mockBaseUrlController = TextEditingController();
  final ScrollController _logScrollController = ScrollController();
  int _lastLogCount = 0;

  @override
  void initState() {
    super.initState();
    _viewModel = DemoViewModel(
      analytics: const AnalyticsService(),
      initialConfig: widget.initialConfig,
    )..init();
    _mockBaseUrlController.text = _viewModel.mockBaseUrl;
    _viewModel.addListener(_handleViewModelChanged);
  }

  @override
  void dispose() {
    _viewModel.removeListener(_handleViewModelChanged);
    _viewModel.dispose();
    _mockBaseUrlController.dispose();
    _logScrollController.dispose();
    super.dispose();
  }

  void _handleViewModelChanged() {
    if (!mounted) {
      return;
    }
    if (_viewModel.logs.length != _lastLogCount) {
      _lastLogCount = _viewModel.logs.length;
      WidgetsBinding.instance.addPostFrameCallback((_) {
        if (_logScrollController.hasClients) {
          _logScrollController.jumpTo(
            _logScrollController.position.maxScrollExtent,
          );
        }
      });
    }
    setState(() {});
  }

  Widget _buildConfigSummary() {
    final config = _viewModel.activeConfig;
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: <Widget>[
        Text('Endpoint: ${config.endpointBaseUrl}'),
        Text('systemCode: ${config.systemCode}'),
        Text('allowInsecureHttp: ${config.allowInsecureHttp}'),
        Text('useIsolateStorage: ${config.useIsolateStorage}'),
        Text('maxEventAge: ${config.maxEventAge.inSeconds}s'),
      ],
    );
  }

  Widget _actionButton({
    required String key,
    required String label,
    required Future<void> Function() action,
    bool outlined = true,
    bool suppressSdkLogs = false,
  }) {
    return ActionButton(
      label: label,
      outlined: outlined,
      running: _viewModel.isRunning(key),
      onPressed: _viewModel.isRunning(key)
          ? null
          : () => _viewModel.runAction(
              key,
              label,
              action,
              suppressSdkLogs: suppressSdkLogs,
            ),
    );
  }

  Widget _buildActionButtons(List<Widget> buttons) {
    return Wrap(spacing: 12, runSpacing: 12, children: buttons);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('YX Tracking Demo')),
      body: ListView(
        padding: const EdgeInsets.all(16),
        children: <Widget>[
          Text(
            '本地缓存事件数：${_viewModel.cacheCount}',
            style: Theme.of(context).textTheme.titleMedium,
          ),
          const SizedBox(height: 8),
          SectionCard(title: '配置摘要', children: <Widget>[_buildConfigSummary()]),
          SectionCard(
            title: '基础操作',
            children: <Widget>[
              _buildActionButtons(<Widget>[
                _actionButton(
                  key: 'track_demo',
                  label: 'Track 演示事件',
                  action: _viewModel.trackDemoEvent,
                  outlined: false,
                ),
                _actionButton(
                  key: 'flush',
                  label: '立即上报',
                  action: _viewModel.flushNow,
                  outlined: false,
                ),
                _actionButton(
                  key: 'refresh_config',
                  label: '刷新配置',
                  action: _viewModel.refreshConfig,
                ),
              ]),
              const SizedBox(height: 8),
              const Text(
                '说明：已对接 SDK-TEST-FLUTTER 系统；若为 HTTP 联调，请保持 allowInsecureHttp=true。',
              ),
            ],
          ),
          SectionCard(
            title: '压力测试',
            children: <Widget>[
              SwitchListTile(
                contentPadding: EdgeInsets.zero,
                title: const Text('压力测试详细日志'),
                subtitle: const Text('关闭后仅输出结果与异常'),
                value: _viewModel.verboseStressLogs,
                onChanged: (value) => _viewModel.setVerboseStressLogs(value),
              ),
              _buildActionButtons(<Widget>[
                _actionButton(
                  key: 'stress_seq',
                  label: '串行 Track 1000',
                  action: _viewModel.runStressSequential,
                  suppressSdkLogs: !_viewModel.verboseStressLogs,
                ),
                _actionButton(
                  key: 'stress_con',
                  label: '并发 Track 1000',
                  action: _viewModel.runStressConcurrent,
                  suppressSdkLogs: !_viewModel.verboseStressLogs,
                ),
                _actionButton(
                  key: 'continuous',
                  label: '持续 Track + Flush (30秒)',
                  action: _viewModel.runContinuousTrackFlush,
                  suppressSdkLogs: !_viewModel.verboseStressLogs,
                ),
              ]),
            ],
          ),
          SectionCard(
            title: '错误模拟',
            children: <Widget>[
              TextField(
                controller: _mockBaseUrlController,
                decoration: const InputDecoration(
                  labelText: '5xx/Mock BaseUrl（可选）',
                  hintText: 'http://localhost:8080',
                ),
                onChanged: _viewModel.setMockBaseUrl,
              ),
              const SizedBox(height: 8),
              _buildActionButtons(<Widget>[
                _actionButton(
                  key: 'invalid_event',
                  label: '非法事件 (缺少标签)',
                  action: _viewModel.trackInvalidEvent,
                ),
                _actionButton(
                  key: 'timeout',
                  label: '模拟网络超时',
                  action: _viewModel.simulateTimeout,
                ),
                _actionButton(
                  key: 'server_5xx',
                  label: '模拟服务器 5xx',
                  action: _viewModel.simulateServerError,
                ),
              ]),
            ],
          ),
          SectionCard(
            title: '边界用例',
            children: <Widget>[
              _buildActionButtons(<Widget>[
                _actionButton(
                  key: 'empty_params',
                  label: '空参数',
                  action: _viewModel.trackEmptyParams,
                ),
                _actionButton(
                  key: 'large_payload',
                  label: '大载荷 (100KB)',
                  action: _viewModel.trackLargePayload,
                ),
                _actionButton(
                  key: 'special_chars',
                  label: '特殊字符',
                  action: _viewModel.trackSpecialChars,
                ),
                _actionButton(
                  key: 'rapid_init',
                  label: '快速初始化/销毁 (x5)',
                  action: _viewModel.rapidInitDispose,
                ),
                _actionButton(
                  key: 'expiration',
                  label: '测试过期 (1秒)',
                  action: _viewModel.testExpiration,
                ),
              ]),
            ],
          ),
          SectionCard(
            title: '状态与日志',
            children: <Widget>[
              const Text('最近事件（最多 20 条）'),
              const SizedBox(height: 8),
              SizedBox(
                height: 220,
                child: RecentEventList(items: _viewModel.recent),
              ),
              const SizedBox(height: 12),
              const Text('日志输出'),
              const SizedBox(height: 8),
              SizedBox(
                height: 160,
                child: LogList(
                  logs: _viewModel.logs,
                  controller: _logScrollController,
                ),
              ),
            ],
          ),
        ],
      ),
    );
  }
}