import 'package:flutter/material.dart';

/// 배지(Chip) 스타일 매핑과 헬퍼
class BadgeStyles {
  // 색상 팔레트
  static const Color primary = Color(0xFF1565C0); // Blue 700
  static const Color success = Color(0xFF2E7D32); // Green 800
  static const Color warning = Color(0xFFEF6C00); // Orange 800
  static const Color danger = Color(0xFFC62828); // Red 800

  // 배경 톤 (100 계열 느낌)
  static final Color primaryBg = Colors.blue.shade100;
  static final Color successBg = Colors.green.shade100;
  static final Color dangerBg = Colors.red.shade100;
  static final Color neutralBg = Colors.grey.shade200;

  // 회원 유형 컬러/아이콘 매핑
  static Chip memberType(String type) {
    late final Color bg;
    late final IconData icon;
    switch (type) {
      case '정회원':
        bg = primaryBg;
        icon = Icons.person;
        break;
      case '준회원':
        bg = Colors.indigo.shade100;
        icon = Icons.person_outline;
        break;
      case '게스트':
        bg = neutralBg;
        icon = Icons.person_add_alt;
        break;
      default:
        bg = neutralBg;
        icon = Icons.person_outline;
    }
    return _chip(type, bg, icon);
  }

  // 참가 상태 컬러/아이콘 매핑
  static Chip participantStatus(String status) {
    late final Color bg;
    late final IconData icon;
    switch (status) {
      case '등록됨':
        bg = neutralBg;
        icon = Icons.how_to_reg;
        break;
      case '확인됨':
        bg = successBg;
        icon = Icons.check_circle;
        break;
      case '취소됨':
        bg = dangerBg;
        icon = Icons.cancel;
        break;
      case '참석함':
        bg = primaryBg;
        icon = Icons.event_available;
        break;
      default:
        bg = neutralBg;
        icon = Icons.help_outline;
    }
    return _chip(status, bg, icon);
  }

  // 회원 상태 컬러/아이콘 매핑 (라벨 기준: 활성/비활성/정지/삭제됨)
  static Chip memberStatus(String label) {
    late final Color bg;
    late final IconData icon;
    switch (label) {
      case '활성':
        bg = successBg;
        icon = Icons.check_circle;
        break;
      case '비활성':
        bg = neutralBg;
        icon = Icons.pause_circle_filled;
        break;
      case '정지':
        bg = dangerBg;
        icon = Icons.block;
        break;
      case '삭제됨':
        bg = Colors.grey.shade300;
        icon = Icons.delete_forever;
        break;
      default:
        bg = neutralBg;
        icon = Icons.person;
    }
    return _chip(label, bg, icon);
  }

  // 결제 상태 컬러/아이콘 매핑
  static Chip payment(bool isPaid) {
    return _chip(
      isPaid ? '결제완료' : '미결제',
      isPaid ? successBg : dangerBg,
      isPaid ? Icons.check_circle : Icons.cancel,
    );
  }

  // 이벤트 상태 컬러/아이콘 매핑
  static Chip eventStatus(String status) {
    late final Color bg;
    late final IconData icon;
    switch (status) {
      case '활성':
        bg = successBg;
        icon = Icons.check_circle;
        break;
      case '대기':
        bg = Colors.amber.shade100;
        icon = Icons.hourglass_top;
        break;
      case '취소':
        bg = dangerBg;
        icon = Icons.cancel;
        break;
      case '완료':
        bg = Colors.grey.shade300;
        icon = Icons.done_all;
        break;
      default:
        bg = neutralBg;
        icon = Icons.event;
    }
    return _chip(status, bg, icon);
  }

  static Chip _chip(String text, Color bg, IconData icon) {
    // 배경 대비에 따라 텍스트/아이콘 색상을 자동 설정 (흰/검정 중 더 높은 대비 선택)
    double lumBg = bg.computeLuminance();
    // 대비비 계산 함수 (WCAG 근사)
    double contrast(double lum1, double lum2) {
      final double l1 = lum1 > lum2 ? lum1 : lum2;
      final double l2 = lum1 > lum2 ? lum2 : lum1;
      return (l1 + 0.05) / (l2 + 0.05);
    }
    final double contrastWithWhite = contrast(lumBg, Colors.white.computeLuminance());
    final double contrastWithBlack = contrast(lumBg, Colors.black.computeLuminance());
    final Color fg = contrastWithWhite >= contrastWithBlack ? Colors.white : Colors.black;
    return Chip(
      avatar: Icon(icon, size: 16, color: fg),
      label: Text(text, style: TextStyle(color: fg)),
      backgroundColor: bg,
      padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 0),
      materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
    );
  }
}