import 'package:flutter/material.dart';

import '../api/oa_client.dart';
import '../theme.dart';
import '../widgets/beian_footer.dart';

class LegalPage extends StatefulWidget {
  const LegalPage({super.key, required this.api, required this.kind});
  final OaClient api;
  final String kind;

  @override
  State<LegalPage> createState() => _LegalPageState();
}

class _LegalPageState extends State<LegalPage> {
  String _title = '';
  String _meta = '';
  List<Map<String, String>> _sections = [];
  String _error = '';
  bool _loading = true;

  @override
  void initState() {
    super.initState();
    _title = widget.kind == 'privacy' ? '隐私政策' : '用户协议';
    _load();
  }

  Future<void> _load() async {
    try {
      final data = await widget.api.get('/legal/${widget.kind}');
      if (data is! Map) throw ApiException('文档格式错误');
      final paras = data['paragraphs'];
      final sections = <Map<String, String>>[];
      if (paras is List) {
        for (final row in paras) {
          if (row is Map) {
            sections.add({
              'heading': '${row['heading'] ?? ''}',
              'body': '${row['body'] ?? ''}',
            });
          }
        }
      }
      if (!mounted) return;
      setState(() {
        _title = '${data['title'] ?? _title}';
        _meta = '${data['operator'] ?? ''} · 更新日期 ${data['updatedAt'] ?? ''}';
        _sections = sections;
        _loading = false;
      });
    } catch (e) {
      if (!mounted) return;
      setState(() {
        _error = '$e';
        _loading = false;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.white,
      appBar: AppBar(title: Text(_title)),
      body: _loading
          ? const Center(child: CircularProgressIndicator(color: kBind))
          : _error.isNotEmpty
              ? Center(child: Padding(padding: const EdgeInsets.all(24), child: Text(_error, style: const TextStyle(color: kDanger))))
              : ListView(
                  padding: const EdgeInsets.fromLTRB(20, 12, 20, 40),
                  children: [
                    if (_meta.trim().isNotEmpty)
                      Padding(
                        padding: const EdgeInsets.only(bottom: 16),
                        child: Text(_meta, style: const TextStyle(color: kMute, fontSize: 12, height: 1.5)),
                      ),
                    for (final s in _sections) ...[
                      if ((s['heading'] ?? '').isNotEmpty)
                        Padding(
                          padding: const EdgeInsets.only(top: 8, bottom: 8),
                          child: Text(s['heading']!, style: const TextStyle(fontSize: 16, fontWeight: FontWeight.w600)),
                        ),
                      Text(s['body'] ?? '', style: const TextStyle(fontSize: 14, height: 1.7, color: Color(0xFF334155))),
                      const SizedBox(height: 12),
                    ],
                    const BeianFooter(),
                  ],
                ),
    );
  }
}