import 'package:client_proxy_framework/client_proxy_framework.dart';

/// 从 `common_info.extConfig`（[ExtConfigRuntime]）与 `skin_config.extConfig.defaults` 解析文档类 URL。
/// 用于用户协议、隐私政策及后续其他 H5 页面。
abstract final class ExtConfigDocumentUrls {
  ExtConfigDocumentUrls._();

  /// 用户协议（wire 键由 skin 的 `agreementUrl` → `agreement` 等映射）。
  static String? get agreementUrl =>
      _resolve((d) => d.agreementUrl);

  /// 隐私政策（wire 键由 skin 的 `privacyUrl` → `privacy` 等映射）。
  static String? get privacyUrl =>
      _resolve((d) => d.privacyUrl);

  /// 通用：优先 [ExtConfigRuntime.data]，再回退到换皮默认 [AppConfig.extConfigDefaults]。
  static String? resolve(String? Function(ExtConfigData d) pick) => _resolve(pick);

  static String? _resolve(String? Function(ExtConfigData d) pick) {
    final runtime = ExtConfigRuntime.data.value;
    if (runtime != null) {
      final u = pick(runtime)?.trim();
      if (u != null && u.isNotEmpty) return u;
    }
    final skin = _fromSkinDefaults();
    if (skin != null) {
      final u = pick(skin)?.trim();
      if (u != null && u.isNotEmpty) return u;
    }
    return null;
  }

  static ExtConfigData? _fromSkinDefaults() {
    final cfg = ApiClient.instance.config;
    final raw = cfg.extConfigDefaults;
    final schema = cfg.extConfigKeySchema;
    if (raw == null || raw.isEmpty) return null;
    try {
      return ExtConfigData.fromJson(
        Map<String, dynamic>.from(raw),
        schema: schema,
        fieldMapping: cfg.fieldMapping,
      );
    } catch (_) {
      return null;
    }
  }
}