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

import 'badnote_log.dart';
import 'diagnostic_export.dart';
import '../editor/canvas/input_diagnostics.dart';
import '../editor/input/diagnostic_logger.dart';
import '../editor/input/pen_input_service.dart';

/// Shared diagnostics chrome: overlay readout + export action.
/// Mount on any document surface (note / PDF / PPT / board).
class DiagnosticChrome extends StatefulWidget {
  const DiagnosticChrome({
    super.key,
    required this.child,
    this.initiallyVisible = false,
  });

  final Widget child;
  final bool initiallyVisible;

  @override
  State<DiagnosticChrome> createState() => DiagnosticChromeState();
}

class DiagnosticChromeState extends State<DiagnosticChrome> {
  late bool _visible = widget.initiallyVisible;
  bool _exporting = false;
  String? _lastExportPath;

  bool get isVisible => _visible;

  void toggle() {
    setState(() {
      _visible = !_visible;
      if (_visible) {
        DiagnosticLogger.instance.start();
        InputDiagnostics.instance.reset();
      } else {
        DiagnosticLogger.instance.stop();
      }
    });
  }

  Future<void> exportPack() async {
    if (_exporting) return;
    setState(() => _exporting = true);
    try {
      final result = await DiagnosticExport.instance.exportPack();
      if (!mounted) return;
      setState(() => _lastExportPath = result.zipPath);
      await Clipboard.setData(ClipboardData(text: result.zipPath));
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text(
            '诊断包已导出 (${result.bytes} bytes)\n路径已复制到剪贴板',
          ),
          duration: const Duration(seconds: 5),
        ),
      );
    } catch (e) {
      BadNoteLog.instance.error(LogSubsystem.diag, 'export_failed', fields: {
        'error': '$e',
      });
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('导出失败: $e')),
      );
    } finally {
      if (mounted) setState(() => _exporting = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Stack(
      fit: StackFit.expand,
      children: [
        widget.child,
        if (_visible)
          Positioned(
            left: 8,
            right: 8,
            bottom: 8,
            child: Material(
              elevation: 6,
              borderRadius: BorderRadius.circular(8),
              color: Colors.black.withValues(alpha: 0.82),
              child: Padding(
                padding: const EdgeInsets.all(10),
                child: DefaultTextStyle(
                  style: const TextStyle(
                    color: Colors.white,
                    fontSize: 11,
                    fontFamily: 'monospace',
                    height: 1.35,
                  ),
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      ListenableBuilder(
                        listenable: InputDiagnostics.instance,
                        builder: (context, _) {
                          return Text(
                            '${InputDiagnostics.instance.summary()}\n'
                            '${PenInputService.instance.debugSummary}\n'
                            'log: ${BadNoteLog.instance.path ?? "(starting…)"}\n'
                            'session: ${BadNoteLog.instance.sessionId}'
                            '${_lastExportPath != null ? "\nlast zip: $_lastExportPath" : ""}',
                          );
                        },
                      ),
                      const SizedBox(height: 8),
                      Row(
                        children: [
                          TextButton(
                            onPressed: () => InputDiagnostics.instance.reset(),
                            child: const Text('Reset',
                                style: TextStyle(color: Colors.white70)),
                          ),
                          TextButton(
                            onPressed: _exporting ? null : exportPack,
                            child: Text(
                              _exporting ? 'Exporting…' : 'Export pack',
                              style: const TextStyle(color: Colors.lightGreenAccent),
                            ),
                          ),
                          TextButton(
                            onPressed: toggle,
                            child: const Text('Hide',
                                style: TextStyle(color: Colors.white54)),
                          ),
                        ],
                      ),
                    ],
                  ),
                ),
              ),
            ),
          ),
      ],
    );
  }
}

/// Compact icon button for app bars / toolbars.
class DiagnosticToggleButton extends StatelessWidget {
  const DiagnosticToggleButton({
    super.key,
    required this.onToggle,
    required this.onExport,
  });

  final VoidCallback onToggle;
  final VoidCallback onExport;

  @override
  Widget build(BuildContext context) {
    return PopupMenuButton<String>(
      tooltip: 'Diagnostics',
      icon: const Icon(Icons.bug_report_outlined),
      onSelected: (v) {
        if (v == 'toggle') onToggle();
        if (v == 'export') onExport();
      },
      itemBuilder: (context) => const [
        PopupMenuItem(value: 'toggle', child: Text('Toggle overlay')),
        PopupMenuItem(value: 'export', child: Text('Export diagnostic pack')),
      ],
    );
  }
}