import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:diagd/src/rust/api/diagnostics.dart';

class CrashesTab extends StatefulWidget {
  final List<CrashReportInfo> crashes;

  const CrashesTab({
    super.key,
    required this.crashes,
  });

  @override
  State<CrashesTab> createState() => _CrashesTabState();
}

class _CrashesTabState extends State<CrashesTab> {
  int _selectedCrashIndex = 0;

  @override
  Widget build(BuildContext context) {
    if (widget.crashes.isEmpty) {
      return Center(
        child: Container(
          constraints: const BoxConstraints(maxWidth: 550),
          margin: const EdgeInsets.all(24),
          padding: const EdgeInsets.all(32),
          decoration: BoxDecoration(
            color: const Color(0xFF161B22),
            borderRadius: BorderRadius.circular(12),
            border: Border.all(color: const Color(0xFF238636).withAlpha(80)),
          ),
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              Container(
                padding: const EdgeInsets.all(16),
                decoration: BoxDecoration(
                  color: const Color(0xFF238636).withAlpha(30),
                  shape: BoxShape.circle,
                ),
                child: const Icon(
                  Icons.verified_rounded,
                  color: Color(0xFF3FB950),
                  size: 44,
                ),
              ),
              const SizedBox(height: 18),
              const Text(
                'Аварийных падений не зафиксировано',
                style: TextStyle(
                  fontSize: 18,
                  fontWeight: FontWeight.bold,
                  color: Color(0xFFE6EDF3),
                ),
              ),
              const SizedBox(height: 8),
              const Text(
                'В системных журналах coredumpctl, /var/crash, dmesg и crash reporter отсутствуют записи о падениях процессов по сигналам SIGSEGV, SIGABRT или сбоям ядра.',
                textAlign: TextAlign.center,
                style: TextStyle(fontSize: 13, color: Color(0xFF8B949E), height: 1.4),
              ),
            ],
          ),
        ),
      );
    }

    final selectedCrash = widget.crashes[_selectedCrashIndex.clamp(0, widget.crashes.length - 1)];

    return LayoutBuilder(
      builder: (context, constraints) {
        final isWide = constraints.maxWidth > 850;

        if (isWide) {
          return Padding(
            padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 20),
            child: Row(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                // Left Column: Crash list
                SizedBox(
                  width: 340,
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      _buildListHeader(),
                      const SizedBox(height: 10),
                      Expanded(
                        child: ListView.separated(
                          itemCount: widget.crashes.length,
                          separatorBuilder: (context, index) => const SizedBox(height: 8),
                          itemBuilder: (context, index) {
                            final crash = widget.crashes[index];
                            final isSelected = index == _selectedCrashIndex;
                            return _buildCrashListItem(crash, isSelected, () {
                              setState(() {
                                _selectedCrashIndex = index;
                              });
                            });
                          },
                        ),
                      ),
                    ],
                  ),
                ),
                const SizedBox(width: 20),
                // Right Column: Crash details
                Expanded(
                  child: SingleChildScrollView(
                    child: _buildCrashDetails(context, selectedCrash),
                  ),
                ),
              ],
            ),
          );
        } else {
          return SingleChildScrollView(
            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 16),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                _buildListHeader(),
                const SizedBox(height: 10),
                SizedBox(
                  height: 180,
                  child: ListView.separated(
                    scrollDirection: Axis.horizontal,
                    itemCount: widget.crashes.length,
                    separatorBuilder: (context, index) => const SizedBox(width: 10),
                    itemBuilder: (context, index) {
                      final crash = widget.crashes[index];
                      final isSelected = index == _selectedCrashIndex;
                      return SizedBox(
                        width: 260,
                        child: _buildCrashListItem(crash, isSelected, () {
                          setState(() {
                            _selectedCrashIndex = index;
                          });
                        }),
                      );
                    },
                  ),
                ),
                const SizedBox(height: 20),
                _buildCrashDetails(context, selectedCrash),
              ],
            ),
          );
        }
      },
    );
  }

  Widget _buildListHeader() {
    return Row(
      mainAxisAlignment: MainAxisAlignment.spaceBetween,
      children: [
        const Text(
          'ЖУРНАЛ АВАРИЙНЫХ СБОЕВ',
          style: TextStyle(
            fontSize: 12,
            fontWeight: FontWeight.w700,
            letterSpacing: 1.2,
            color: Color(0xFF8B949E),
          ),
        ),
        Container(
          padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 2),
          decoration: BoxDecoration(
            color: const Color(0xFFF85149).withAlpha(25),
            borderRadius: BorderRadius.circular(10),
            border: Border.all(color: const Color(0xFFF85149).withAlpha(70)),
          ),
          child: Text(
            '${widget.crashes.length}',
            style: const TextStyle(
              fontSize: 11,
              fontWeight: FontWeight.bold,
              color: Color(0xFFF85149),
            ),
          ),
        ),
      ],
    );
  }

  Widget _buildCrashListItem(CrashReportInfo crash, bool isSelected, VoidCallback onTap) {
    return InkWell(
      onTap: onTap,
      borderRadius: BorderRadius.circular(8),
      child: Container(
        padding: const EdgeInsets.all(12),
        decoration: BoxDecoration(
          color: isSelected ? const Color(0xFF21262D) : const Color(0xFF161B22),
          borderRadius: BorderRadius.circular(8),
          border: Border.all(
            color: isSelected ? const Color(0xFFF85149) : const Color(0xFF30363D),
            width: isSelected ? 1.5 : 1.0,
          ),
        ),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(
              children: [
                Container(
                  padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
                  decoration: BoxDecoration(
                    color: const Color(0xFFF85149).withAlpha(30),
                    borderRadius: BorderRadius.circular(4),
                  ),
                  child: Text(
                    crash.signalOrCode,
                    style: const TextStyle(
                      fontSize: 11,
                      fontWeight: FontWeight.bold,
                      color: Color(0xFFF85149),
                    ),
                  ),
                ),
                const SizedBox(width: 8),
                Expanded(
                  child: Text(
                    crash.processName,
                    maxLines: 1,
                    overflow: TextOverflow.ellipsis,
                    style: const TextStyle(
                      fontSize: 14,
                      fontWeight: FontWeight.bold,
                      color: Color(0xFFE6EDF3),
                    ),
                  ),
                ),
              ],
            ),
            const SizedBox(height: 6),
            Text(
              crash.timestamp,
              style: const TextStyle(fontSize: 11, color: Color(0xFF8B949E)),
            ),
            if (crash.pid != null) ...[
              const SizedBox(height: 2),
              Text(
                'PID: ${crash.pid}',
                style: const TextStyle(fontSize: 11, color: Color(0xFF8B949E), fontFamily: 'monospace'),
              ),
            ],
          ],
        ),
      ),
    );
  }

  Widget _buildCrashDetails(BuildContext context, CrashReportInfo crash) {
    final debugCmd = crash.dumpPath != null && crash.dumpPath!.isNotEmpty
        ? 'gdb ${crash.processName} ${crash.dumpPath!}'
        : (crash.pid != null ? 'coredumpctl debug ${crash.pid}' : 'coredumpctl info ${crash.processName}');

    return Container(
      padding: const EdgeInsets.all(20),
      decoration: BoxDecoration(
        color: const Color(0xFF161B22),
        borderRadius: BorderRadius.circular(10),
        border: Border.all(color: const Color(0xFF30363D)),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              Row(
                children: [
                  const Icon(Icons.bug_report_rounded, color: Color(0xFFF85149), size: 24),
                  const SizedBox(width: 10),
                  Text(
                    crash.processName,
                    style: const TextStyle(
                      fontSize: 18,
                      fontWeight: FontWeight.bold,
                      color: Color(0xFFE6EDF3),
                    ),
                  ),
                  const SizedBox(width: 10),
                  Container(
                    padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 3),
                    decoration: BoxDecoration(
                      color: const Color(0xFFF85149).withAlpha(25),
                      borderRadius: BorderRadius.circular(6),
                      border: Border.all(color: const Color(0xFFF85149).withAlpha(70)),
                    ),
                    child: Text(
                      crash.signalOrCode,
                      style: const TextStyle(
                        fontSize: 12,
                        fontWeight: FontWeight.bold,
                        color: Color(0xFFF85149),
                      ),
                    ),
                  ),
                ],
              ),
              if (crash.pid != null)
                Text(
                  'PID: ${crash.pid}',
                  style: const TextStyle(
                    fontSize: 13,
                    color: Color(0xFF8B949E),
                    fontFamily: 'monospace',
                  ),
                ),
            ],
          ),
          const SizedBox(height: 16),

          // Metadata Grid
          Container(
            padding: const EdgeInsets.all(14),
            decoration: BoxDecoration(
              color: const Color(0xFF0D1117),
              borderRadius: BorderRadius.circular(8),
              border: Border.all(color: const Color(0xFF21262D)),
            ),
            child: Column(
              children: [
                _buildMetaRow('Время падения:', crash.timestamp),
                if (crash.faultModule != null && crash.faultModule!.isNotEmpty)
                  _buildMetaRow('Сбойный модуль:', crash.faultModule!),
                if (crash.dumpPath != null && crash.dumpPath!.isNotEmpty) ...[
                  Row(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      const SizedBox(
                        width: 130,
                        child: Text(
                          'Файл Core Dump:',
                          style: TextStyle(fontSize: 12, color: Color(0xFF8B949E)),
                        ),
                      ),
                      Expanded(
                        child: Text(
                          crash.dumpPath!,
                          style: const TextStyle(
                            fontSize: 12,
                            color: Color(0xFF58A6FF),
                            fontFamily: 'monospace',
                          ),
                        ),
                      ),
                      IconButton(
                        icon: const Icon(Icons.copy_rounded, size: 14, color: Color(0xFF8B949E)),
                        padding: EdgeInsets.zero,
                        constraints: const BoxConstraints(),
                        tooltip: 'Копировать путь к дампу',
                        onPressed: () {
                          Clipboard.setData(ClipboardData(text: crash.dumpPath!));
                          ScaffoldMessenger.of(context).showSnackBar(
                            const SnackBar(content: Text('Путь к Core Dump скопирован'), duration: Duration(seconds: 2)),
                          );
                        },
                      ),
                    ],
                  ),
                ],
              ],
            ),
          ),
          const SizedBox(height: 20),

          // Debug CLI Command
          const Text(
            'КОМАНДА ОТЛАДКИ (GDB / COREDUMPCTL)',
            style: TextStyle(
              fontSize: 11,
              fontWeight: FontWeight.w700,
              letterSpacing: 1.0,
              color: Color(0xFF8B949E),
            ),
          ),
          const SizedBox(height: 8),
          Container(
            padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 10),
            decoration: BoxDecoration(
              color: const Color(0xFF0D1117),
              borderRadius: BorderRadius.circular(8),
              border: Border.all(color: const Color(0xFF30363D)),
            ),
            child: Row(
              children: [
                const Text(
                  '\$ ',
                  style: TextStyle(color: Color(0xFF3FB950), fontWeight: FontWeight.bold),
                ),
                Expanded(
                  child: Text(
                    debugCmd,
                    style: const TextStyle(
                      color: Color(0xFFE6EDF3),
                      fontFamily: 'monospace',
                      fontSize: 13,
                    ),
                  ),
                ),
                IconButton(
                  icon: const Icon(Icons.copy_rounded, size: 16, color: Color(0xFF8B949E)),
                  tooltip: 'Копировать команду',
                  onPressed: () {
                    Clipboard.setData(ClipboardData(text: debugCmd));
                    ScaffoldMessenger.of(context).showSnackBar(
                      const SnackBar(content: Text('Команда отладки скопирована'), duration: Duration(seconds: 2)),
                    );
                  },
                ),
              ],
            ),
          ),
          const SizedBox(height: 20),

          // Stack Trace / Backtrace
          const Text(
            'СТЕК ВЫЗОВОВ (BACKTRACE / CRASH TRACE)',
            style: TextStyle(
              fontSize: 11,
              fontWeight: FontWeight.w700,
              letterSpacing: 1.0,
              color: Color(0xFF8B949E),
            ),
          ),
          const SizedBox(height: 8),
          Container(
            width: double.infinity,
            padding: const EdgeInsets.all(14),
            decoration: BoxDecoration(
              color: const Color(0xFF0D1117),
              borderRadius: BorderRadius.circular(8),
              border: Border.all(color: const Color(0xFF21262D)),
            ),
            child: crash.stackTraceSnippet.isNotEmpty
                ? SelectableText(
                    crash.stackTraceSnippet,
                    style: const TextStyle(
                      color: Color(0xFFE6EDF3),
                      fontFamily: 'monospace',
                      fontSize: 12,
                      height: 1.4,
                    ),
                  )
                : const Text(
                    'Трассировка стека недоступна в данном дампе памяти.',
                    style: TextStyle(color: Color(0xFF8B949E), fontSize: 12),
                  ),
          ),
        ],
      ),
    );
  }

  Widget _buildMetaRow(String label, String value) {
    return Padding(
      padding: const EdgeInsets.only(bottom: 6),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          SizedBox(
            width: 130,
            child: Text(
              label,
              style: const TextStyle(fontSize: 12, color: Color(0xFF8B949E)),
            ),
          ),
          Expanded(
            child: Text(
              value,
              style: const TextStyle(
                fontSize: 12,
                fontWeight: FontWeight.w600,
                color: Color(0xFFE6EDF3),
              ),
            ),
          ),
        ],
      ),
    );
  }
}