import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

import '../../core/theme/app_theme.dart';
import '../../services/invite_service.dart';

/// 邀请好友页：我的邀请码 + 推广统计 + 一键复制推广文案（含口令与下载链接）
class InviteScreen extends StatefulWidget {
  const InviteScreen({super.key});

  @override
  State<InviteScreen> createState() => _InviteScreenState();
}

class _InviteScreenState extends State<InviteScreen> {
  late Future<ReferralInfo> _future;

  @override
  void initState() {
    super.initState();
    _future = InviteService.fetchMyReferral();
  }

  Future<void> _copyShareText(ReferralInfo info) async {
    final text = InviteService.buildShareText(
      inviteCode: info.inviteCode,
      inviteUrl: info.inviteUrl,
    );
    await Clipboard.setData(ClipboardData(text: text));
    if (mounted) {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('推广文案已复制，快去分享给好友吧')),
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('邀请好友')),
      body: FutureBuilder<ReferralInfo>(
        future: _future,
        builder: (context, snap) {
          if (snap.hasError) {
            return Center(
              child: TextButton(
                onPressed: () => setState(() => _future = InviteService.fetchMyReferral()),
                child: const Text('加载失败，点击重试'),
              ),
            );
          }
          final info = snap.data;
          if (info == null) {
            return const Center(child: CircularProgressIndicator());
          }
          return ListView(
            padding: const EdgeInsets.all(20),
            children: [
              // 邀请码卡片
              Container(
                padding: const EdgeInsets.all(24),
                decoration: BoxDecoration(
                  gradient: const LinearGradient(
                    colors: [AppColors.primary, AppColors.secondary],
                  ),
                  borderRadius: BorderRadius.circular(16),
                ),
                child: Column(
                  children: [
                    const Text('我的邀请码', style: TextStyle(color: Colors.white70, fontSize: 13)),
                    const SizedBox(height: 8),
                    Text(
                      info.inviteCode,
                      style: const TextStyle(
                        color: Colors.white,
                        fontSize: 32,
                        fontWeight: FontWeight.w800,
                        letterSpacing: 4,
                      ),
                    ),
                    const SizedBox(height: 16),
                    SizedBox(
                      width: double.infinity,
                      child: ElevatedButton.icon(
                        onPressed: () => _copyShareText(info),
                        icon: const Icon(Icons.copy, size: 18),
                        label: const Text('复制推广文案'),
                        style: ElevatedButton.styleFrom(
                          backgroundColor: Colors.white,
                          foregroundColor: AppColors.primary,
                        ),
                      ),
                    ),
                  ],
                ),
              ),
              const SizedBox(height: 24),

              // 推广统计
              Row(
                children: [
                  _Stat(label: '累计邀请', value: '${info.totalInvitees}'),
                  _Stat(label: '已激活', value: '${info.activatedCount}'),
                  _Stat(label: '奖励积分', value: '${info.rewardPointsTotal}'),
                  _Stat(label: '返利资产', value: info.rebateAssetsTotal.toStringAsFixed(1)),
                ],
              ),
              const SizedBox(height: 24),

              // 规则说明
              const Text('邀请规则', style: TextStyle(fontSize: 15, fontWeight: FontWeight.w700)),
              const SizedBox(height: 12),
              const _Rule(text: '好友通过你的推广链接或口令注册，即绑定为你的下级'),
              const _Rule(text: '下级 72 小时内观看满 3 个视频即激活，你得邀请积分奖励'),
              const _Rule(text: '下级充值积分，你按比例的返利资产（可提现）'),
              if (!info.eligible) ...[
                const SizedBox(height: 8),
                const _Rule(text: '开通会员后才可享受邀请奖励资格', highlight: true),
              ],
            ],
          );
        },
      ),
    );
  }
}

class _Stat extends StatelessWidget {
  const _Stat({required this.label, required this.value});

  final String label;
  final String value;

  @override
  Widget build(BuildContext context) {
    return Expanded(
      child: Column(
        children: [
          Text(value, style: const TextStyle(fontSize: 18, fontWeight: FontWeight.w700)),
          const SizedBox(height: 4),
          Text(label, style: const TextStyle(color: AppColors.textSecondary, fontSize: 12)),
        ],
      ),
    );
  }
}

class _Rule extends StatelessWidget {
  const _Rule({required this.text, this.highlight = false});

  final String text;
  final bool highlight;

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.only(bottom: 8),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text('· ', style: TextStyle(color: highlight ? AppColors.gold : AppColors.textSecondary)),
          Expanded(
            child: Text(
              text,
              style: TextStyle(
                color: highlight ? AppColors.gold : AppColors.textSecondary,
                fontSize: 13,
                height: 1.5,
              ),
            ),
          ),
        ],
      ),
    );
  }
}