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);
  }

  // 게스트용 초소형 원형 배지 (이니셜 'G')
  static Widget guestSmall({double size = 18, Color? bg, Color? fg}) {
    final Color bgColor = bg ?? neutralBg;
    final Color fgColor = fg ?? Colors.black87;
    return Container(
      width: size,
      height: size,
      decoration: BoxDecoration(
        color: bgColor,
        shape: BoxShape.circle,
        border: Border.all(color: Colors.grey.shade300),
      ),
      alignment: Alignment.center,
      child: Text(
        'G',
        style: TextStyle(
          fontSize: size * 0.62,
          fontWeight: FontWeight.w700,
          color: fgColor,
          height: 1.0,
        ),
      ),
    );
  }

  // 참가 상태 컬러/아이콘 매핑
  static Chip participantStatus(String status) {
    late final Color bg;
    late final IconData icon;
    // status는 한국어 라벨 또는 API 값(pending/confirmed/canceled/attended)로 들어올 수 있음
    final s = status.toLowerCase();
    String label;
    if (s == 'pending' || s == '참가예정' || s == '등록됨' || s == '대기') {
      bg = neutralBg;
      icon = Icons.how_to_reg;
      label = '예정';
    } else if (s == 'confirmed' || s == '참가확정' || s == '확인됨') {
      bg = successBg;
      icon = Icons.check_circle;
      label = '확정';
    } else if (s == 'canceled' || s == '취소' || s == '취소됨') {
      bg = dangerBg;
      icon = Icons.cancel;
      label = '취소';
    } else if (s == 'attended' || s == '참석' || s == '참석함') {
      bg = primaryBg;
      icon = Icons.event_available;
      label = '참석';
    } else {
      bg = neutralBg;
      icon = Icons.help_outline;
      label = status;
    }
    return _chip(label, 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 ? '납부' : '미납',
      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;
    // DB 원시값(영문) 또는 한국어 라벨을 모두 지원하도록 정규화
    final s = status.toLowerCase().trim();
    String label = status; // 표시용 라벨 (한국어)
    if (s == 'active' || s == 'enabled' || s == '활성') {
      label = '활성';
      bg = successBg;
      icon = Icons.check_circle;
    } else if (s == 'pending' ||
        s == 'draft' ||
        s == 'scheduled' ||
        s == 'waiting' ||
        s == '대기') {
      label = '대기';
      bg = Colors.amber.shade100;
      icon = Icons.hourglass_top;
    } else if (s == 'canceled' || s == 'cancelled' || s == '취소') {
      label = '취소';
      bg = dangerBg;
      icon = Icons.cancel;
    } else if (s == 'completed' ||
        s == 'done' ||
        s == 'finished' ||
        s == '완료') {
      label = '완료';
      bg = Colors.grey.shade300;
      icon = Icons.done_all;
    } else {
      // 알 수 없는 상태는 중립 처리
      label = status;
      bg = neutralBg;
      icon = Icons.event;
    }
    return _chip(label, 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: 14, color: fg),
      label: Text(text, style: TextStyle(color: fg, fontSize: 11)),
      backgroundColor: bg,
      padding: const EdgeInsets.symmetric(horizontal: 2, vertical: 0),
      labelPadding: const EdgeInsets.only(left: -2, right: 5),
      materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
      visualDensity: const VisualDensity(horizontal: -3, vertical: -3),
    );
  }
}