import 'package:flutter/material.dart';

import '../../../core/theme/tokens.dart';
import '../../../core/ui/relative_time.dart';
import '../campaign_data.dart';
import 'campaign_style.dart';

/// 기여 랭킹 조각 — 시안 `333:70971`(사용자 랭킹) · 캠페인 상세 「실시간 랭킹」 공용.

/// 랭킹 데이터에 사진 필드가 없어 시안 목록의 단색 원을 순위 순서대로 돌려 쓴다.
const _avatarColors = [
  Color(0xFF000000),
  Color(0xFF7358E9),
  Color(0xFFFA46E8),
  Color(0xFFC6D284),
  Color(0xFFF4CFFA),
];

/// 순위 아바타. 내 줄은 MY 프로필과 같은 시안 표본을 쓴다.
class RankAvatar extends StatelessWidget {
  const RankAvatar({super.key, required this.rank, required this.size});

  final ContributorRank rank;
  final double size;

  @override
  Widget build(BuildContext context) => rank.isMe
      ? ClipOval(
          child: Image.asset(
            'assets/figma/avatar-sample.png',
            width: size,
            height: size,
            fit: BoxFit.cover,
          ),
        )
      : Container(
          width: size,
          height: size,
          decoration: BoxDecoration(
            shape: BoxShape.circle,
            // 시안 목록은 4위부터 검정 · 보라 · 분홍 · 올리브 · 연분홍 순이다.
            color: _avatarColors[(rank.rank + 1) % _avatarColors.length],
          ),
        );
}

/// 순위 숫자 아래 변동값 — 상승 #f28180 ▲ · 하락 #6866f3 ▼ · 변동 없음 「-」.
class RankChange extends StatelessWidget {
  const RankChange({super.key, required this.change});

  final int change;

  @override
  Widget build(BuildContext context) {
    if (change == 0) {
      return Text(
        '-',
        style: campaignText(10, 500, const Color(0xFF777777), height: 1),
      );
    }
    final up = change > 0;
    final color = up ? const Color(0xFFF28180) : AppColors.neonViolet;
    return Row(
      mainAxisSize: MainAxisSize.min,
      children: [
        Text(
          up ? '▲' : '▼',
          style: TextStyle(fontSize: 8, height: 1, color: color),
        ),
        const SizedBox(width: 2),
        Text('${change.abs()}', style: campaignText(10, 500, color, height: 1)),
      ],
    );
  }
}

/// 순위 한 줄 — 높이 60 · [순위+변동] 28 [아바타 40(원 36) · 6 · 닉네임 14/500 #979b9e] … 기여 POP 16/600.
class RankRow extends StatelessWidget {
  const RankRow({
    super.key,
    required this.rank,
    this.padding = const EdgeInsets.symmetric(vertical: 10),
  });

  final ContributorRank rank;
  final EdgeInsets padding;

  @override
  Widget build(BuildContext context) => Padding(
    padding: padding,
    child: Row(
      children: [
        ConstrainedBox(
          constraints: const BoxConstraints(minWidth: 17),
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              Text(
                '${rank.rank}',
                style: campaignText(14, 600, AppColors.onCosmic, height: 1),
              ),
              const SizedBox(height: 2),
              RankChange(change: rank.change),
            ],
          ),
        ),
        const SizedBox(width: 28),
        // 사본 — 40 프레임 가운데 지름 36 원.
        SizedBox.square(
          dimension: 40,
          child: Center(child: RankAvatar(rank: rank, size: 36)),
        ),
        const SizedBox(width: 6),
        Expanded(
          child: Text(
            rank.name,
            overflow: TextOverflow.ellipsis,
            style: campaignText(14, 500, const Color(0xFF979B9E), height: 1),
          ),
        ),
        Text(
          formatReaction(rank.pop),
          style: campaignText(16, 600, AppColors.onCosmic, height: 1.4),
        ),
      ],
    ),
  );
}

/// 1~3위 단상 — 2 · 1 · 3 순서, 1위만 20 위로 올린다. 왕관 24 · 아바타 80.
class RankPodium extends StatelessWidget {
  const RankPodium({super.key, required this.top});

  /// 순위 오름차순 앞 세 줄.
  final List<ContributorRank> top;

  static const _crown = {
    1: Color(0xFFFEA300),
    2: Color(0xFFACACAC),
    3: Color(0xFF9C724A),
  };

  @override
  Widget build(BuildContext context) {
    final byRank = {for (final r in top) r.rank: r};
    return Row(
      mainAxisAlignment: MainAxisAlignment.center,
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        for (final (i, place) in const [2, 1, 3].indexed) ...[
          if (i > 0) const SizedBox(width: 24),
          SizedBox(width: 81, child: _place(byRank[place], place)),
        ],
      ],
    );
  }

  Widget? _place(ContributorRank? r, int place) => r == null
      ? null
      : Padding(
          padding: EdgeInsets.only(top: place == 1 ? 0 : 20),
          child: Column(
            children: [
              _Crown(color: _crown[place]!, place: place),
              RankAvatar(rank: r, size: 80),
              const SizedBox(height: 8),
              Text(
                r.name,
                maxLines: 1,
                overflow: TextOverflow.ellipsis,
                style: campaignText(14, 600, AppColors.onCosmic, height: 1),
              ),
              const SizedBox(height: 4),
              Text(
                formatReaction(r.pop),
                style: campaignText(16, 600, AppColors.onCosmic, height: 1.4),
              ),
            ],
          ),
        );
}

/// 체스 킹 왕관(시안 material-symbols:chess-king) — 십자 · 몸통을 그리고 가운데에 순위.
class _Crown extends StatelessWidget {
  const _Crown({required this.color, required this.place});

  final Color color;
  final int place;

  @override
  Widget build(BuildContext context) => SizedBox(
    width: 24,
    height: 24,
    child: CustomPaint(
      painter: _CrownPainter(color),
      child: Padding(
        padding: const EdgeInsets.only(top: 10),
        child: Center(
          child: Text(
            '$place',
            style: campaignText(10, 900, AppColors.onCosmic, height: 1),
          ),
        ),
      ),
    ),
  );
}

class _CrownPainter extends CustomPainter {
  const _CrownPainter(this.color);

  final Color color;

  @override
  void paint(Canvas canvas, Size size) {
    final p = Paint()..color = color;
    final w = size.width;
    // 십자
    canvas.drawRect(Rect.fromLTWH(w / 2 - 1, 1, 2, 7), p);
    canvas.drawRect(Rect.fromLTWH(w / 2 - 3.5, 3, 7, 2), p);
    // 몸통
    canvas.drawRRect(
      RRect.fromRectAndRadius(
        Rect.fromLTWH(3, 8, w - 6, 15),
        const Radius.circular(4),
      ),
      p,
    );
  }

  @override
  bool shouldRepaint(_CrownPainter old) => old.color != color;
}