chore(cat-voices): adapt signed documents paring (#3823)

* chore: adapt signed documents paring

* chore: rename + throw exception for invalid signed docs

Author: damian-molinski

catalyst_voices/packages/internal/catalyst_voices_repositories/lib/src/signed_document/signed_document_manager_impl.dart

@@ -46,15 +46,13 @@ final class SignedDocumentManagerImpl implements SignedDocumentManager {
       contentType: metadata.contentType,
     );
 
+    final signers = coseSign.signatures.map((e) => e.decodeCatalystId()).nonNulls.toList();
+
     return _CoseSignedDocument(
       coseSign: coseSign,
       payload: payload,
-      metadata: DocumentDataMetadata(
-        contentType: DocumentContentType.json,
-        type: DocumentType.proposalDocument,
-        id: const SignedDocumentRef(id: 'id', ver: 'ver'),
-      ),
-      signers: coseSign.signatures.map((e) => e.decodeCatalystId()).nonNulls.toList(),
+      metadata: metadata.toModel(authors: signers),
+      signers: signers,
     );
   }
 
@@ -193,6 +191,43 @@ final class _CoseSignedDocument with EquatableMixin implements SignedDocument {
   }
 }
 
+extension on SignedDocumentMetadata {
+  DocumentDataMetadata toModel({
+    List<CatalystId>? authors,
+  }) {
+    final id = this.id;
+    final ver = this.ver;
+
+    if (id == null) {
+      throw const FormatException('Signed document id was null');
+    }
+    if (ver == null) {
+      throw const FormatException('Signed document ver was null');
+    }
+
+    return DocumentDataMetadata(
+      contentType: DocumentContentType.json,
+      type: documentType,
+      id: SignedDocumentRef(id: id, ver: ver),
+      ref: ref?.toModel(),
+      template: template?.toModel(),
+      reply: reply?.toModel(),
+      section: section,
+      collaborators: collabs?.map(CatalystId.tryParse).nonNulls.toList(),
+      parameters: DocumentParameters({
+        ?brandId?.toModel(),
+        ?campaignId?.toModel(),
+        ?categoryId?.toModel(),
+      }),
+      authors: authors,
+    );
+  }
+}
+
+extension on SignedDocumentMetadataRef {
+  SignedDocumentRef toModel() => SignedDocumentRef(id: id, ver: ver);
+}
+
 extension _CoseSignatureExt on CoseSignature {
   CatalystId? decodeCatalystId() {
     final kid = protectedHeaders.kid;