import 'package:flutter/material.dart';

/// 전투 로그 엔트리 (Combat Log Entry)
class CombatLogEntry {
  const CombatLogEntry({
    required this.message,
    required this.timestamp,
    this.type = CombatLogType.normal,
  });

  final String message;
  final DateTime timestamp;
  final CombatLogType type;
}

/// 로그 타입에 따른 스타일 구분
enum CombatLogType {
  normal, // 일반 메시지
  damage, // 피해 입힘
  heal, // 회복
  levelUp, // 레벨업
  questComplete, // 퀘스트 완료
  loot, // 전리품 획득
  spell, // 주문 습득
}

/// 전투 로그 위젯 (Phase 8: 실시간 전투 이벤트 표시)
///
/// 최근 전투 이벤트를 스크롤 가능한 리스트로 표시
class CombatLog extends StatefulWidget {
  const CombatLog({super.key, required this.entries, this.maxEntries = 50});

  final List<CombatLogEntry> entries;
  final int maxEntries;

  @override
  State<CombatLog> createState() => _CombatLogState();
}

class _CombatLogState extends State<CombatLog> {
  final ScrollController _scrollController = ScrollController();
  int _previousLength = 0;

  @override
  void didUpdateWidget(CombatLog oldWidget) {
    super.didUpdateWidget(oldWidget);

    // 새 로그 추가 시 자동 스크롤
    if (widget.entries.length > _previousLength) {
      _scrollToBottom();
    }
    _previousLength = widget.entries.length;
  }

  void _scrollToBottom() {
    WidgetsBinding.instance.addPostFrameCallback((_) {
      if (_scrollController.hasClients) {
        _scrollController.animateTo(
          _scrollController.position.maxScrollExtent,
          duration: const Duration(milliseconds: 200),
          curve: Curves.easeOut,
        );
      }
    });
  }

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

  @override
  Widget build(BuildContext context) {
    return ListView.builder(
      controller: _scrollController,
      itemCount: widget.entries.length,
      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
      itemBuilder: (context, index) {
        final entry = widget.entries[index];
        return _LogEntryTile(entry: entry);
      },
    );
  }
}

/// 개별 로그 엔트리 타일
class _LogEntryTile extends StatelessWidget {
  const _LogEntryTile({required this.entry});

  final CombatLogEntry entry;

  @override
  Widget build(BuildContext context) {
    final (color, icon) = _getStyleForType(entry.type);

    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 1),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          // 타임스탬프(timestamp)
          Text(
            _formatTime(entry.timestamp),
            style: TextStyle(
              fontSize: 10,
              color: Theme.of(context).colorScheme.outline,
              fontFamily: 'monospace',
            ),
          ),
          const SizedBox(width: 4),
          // 아이콘
          if (icon != null)
            Padding(
              padding: const EdgeInsets.only(right: 4),
              child: Icon(icon, size: 12, color: color),
            ),
          // 메시지
          Expanded(
            child: Text(
              entry.message,
              style: TextStyle(
                fontSize: 11,
                color: color ?? Theme.of(context).colorScheme.onSurface,
              ),
            ),
          ),
        ],
      ),
    );
  }

  String _formatTime(DateTime time) {
    return '${time.hour.toString().padLeft(2, '0')}:'
        '${time.minute.toString().padLeft(2, '0')}:'
        '${time.second.toString().padLeft(2, '0')}';
  }

  (Color?, IconData?) _getStyleForType(CombatLogType type) {
    return switch (type) {
      CombatLogType.normal => (null, null),
      CombatLogType.damage => (Colors.red.shade300, Icons.local_fire_department),
      CombatLogType.heal => (Colors.green.shade300, Icons.healing),
      CombatLogType.levelUp => (Colors.amber, Icons.arrow_upward),
      CombatLogType.questComplete => (Colors.blue.shade300, Icons.check_circle),
      CombatLogType.loot => (Colors.orange.shade300, Icons.inventory_2),
      CombatLogType.spell => (Colors.purple.shade300, Icons.auto_fix_high),
    };
  }
}