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

class LogViewerScreen extends StatefulWidget {
  final String runId;
  final dynamic api;
  final ValueChanged<bool>? onStatusChanged;

  const LogViewerScreen({
    super.key,
    required this.runId,
    required this.api,
    this.onStatusChanged,
  });

  @override
  State<LogViewerScreen> createState() => _LogViewerScreenState();
}

class _LogViewerScreenState extends State<LogViewerScreen> {
  String _log = '';
  bool _loading = true;
  String? _error;
  Timer? _pollTimer;
  final ScrollController _scrollController = ScrollController();
  bool _autoScroll = true;

  Future<void> _loadLog() async {
    try {
      final log = await widget.api.getRunLog(widget.runId);
      final changed = log != _log;
      setState(() {
        _log = log;
        _loading = false;
      });
      if (changed && _autoScroll && mounted) {
        _scrollController.animateTo(
          _scrollController.position.maxScrollExtent,
          duration: const Duration(milliseconds: 200),
          curve: Curves.easeOut,
        );
      }
    } catch (e) {
      setState(() {
        _error = e.toString();
        _loading = false;
      });
    }
  }

  @override
  void initState() {
    super.initState();
    _loadLog();
    _pollTimer = Timer.periodic(const Duration(seconds: 2), (_) => _loadLog());
  }

  @override
  void dispose() {
    _pollTimer?.cancel();
    _scrollController.dispose();
    super.dispose();
  }

  Future<void> _copyLog() async {
    await Clipboard.setData(ClipboardData(text: _log));
    if (mounted) {
      ScaffoldMessenger.of(
        context,
      ).showSnackBar(const SnackBar(content: Text('Log copied to clipboard')));
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Run Log'),
        actions: [
          IconButton(
            icon: const Icon(Icons.refresh),
            onPressed: _loadLog,
            tooltip: 'Refresh',
          ),
          IconButton(
            icon: const Icon(Icons.copy),
            onPressed: _log.isNotEmpty ? _copyLog : null,
            tooltip: 'Copy',
          ),
          IconButton(
            icon: Icon(
              _autoScroll ? Icons.keyboard_arrow_down : Icons.keyboard_arrow_up,
            ),
            onPressed: () => setState(() => _autoScroll = !_autoScroll),
            tooltip: _autoScroll ? 'Auto-scroll ON' : 'Auto-scroll OFF',
          ),
        ],
      ),
      body: _loading
          ? const Center(child: CircularProgressIndicator())
          : _error != null
          ? Center(child: Text(_error!))
          : _log.isEmpty
          ? const Center(
              child: Text('Log is empty', style: TextStyle(color: Colors.grey)),
            )
          : SelectionArea(
              child: SingleChildScrollView(
                controller: _scrollController,
                padding: const EdgeInsets.all(16),
                child: Text(
                  _log,
                  style: const TextStyle(
                    fontFamily: 'monospace',
                    fontSize: 13,
                    height: 1.5,
                  ),
                ),
              ),
            ),
    );
  }
}