add dispute functionality for contract duty and implement collection dates

apps/edr-freight-api/src/modules/contracts/contract-document-diff.util.ts

@@ -25,7 +25,18 @@ export type ContractDocumentChange =
       toOrder: number;
     }
   | { kind: 'DOCUMENT_TITLE_CHANGED'; title: string; fromTitle: string | null }
-  | { kind: 'WHEREAS_CHANGED'; added: number; removed: number };
+  | { kind: 'WHEREAS_CHANGED'; added: number; removed: number }
+  /**
+   * A contract field (not a document article) changed — the customer editing a
+   * DRAFT/CHANGES_REQUESTED contract, e.g. its route, cargo or service type.
+   */
+  | {
+      kind: 'FIELD_CHANGED';
+      field: string;
+      label: string;
+      from: string | null;
+      to: string | null;
+    };
 
 type SnapshotLike = Pick<
   ContractDocumentSnapshot,
@@ -134,6 +145,60 @@ export function diffSnapshots(
   return changes;
 }
 
+/** Human label per audited contract field, in the order they read on the form. */
+export const CONTRACT_FIELD_LABELS: Record<string, string> = {
+  contractKind: 'Contract kind',
+  tradeDirection: 'Trade direction',
+  freightType: 'Freight type',
+  serviceType: 'Service type',
+  paymentCurrency: 'Payment currency',
+  contractType: 'Contract type',
+  isHazardous: 'Hazardous',
+  hazardClass: 'Hazard class',
+  unNumber: 'UN number',
+  isReefer: 'Reefer',
+  equipmentReturn: 'Equipment return',
+  customsClearingAgent: 'Customs clearing agent',
+  firstMilePickupAddress: 'First-mile pickup address',
+  lastMileDeliveryAddress: 'Last-mile delivery address',
+  routes: 'Routes',
+  cargoScope: 'Cargo scope',
+};
+
+/** Render a field value for the audit trail — never "[object Object]". */
+function displayValue(value: unknown): string | null {
+  if (value === null || value === undefined || value === '') return null;
+  if (typeof value === 'boolean') return value ? 'Yes' : 'No';
+  return String(value);
+}
+
+/**
+ * Compare two flat maps of contract fields and report what changed. Only keys
+ * present in `after` are considered, so a partial update never reports the
+ * fields it did not touch.
+ */
+export function diffContractFields(
+  before: Record<string, unknown>,
+  after: Record<string, unknown>,
+): ContractDocumentChange[] {
+  const changes: ContractDocumentChange[] = [];
+
+  for (const [field, nextRaw] of Object.entries(after)) {
+    const next = displayValue(nextRaw);
+    const previous = displayValue(before[field]);
+    if (next === previous) continue;
+    changes.push({
+      kind: 'FIELD_CHANGED',
+      field,
+      label: CONTRACT_FIELD_LABELS[field] ?? field,
+      from: previous,
+      to: next,
+    });
+  }
+
+  return changes;
+}
+
 /** Short human summary of a change set, e.g. "2 articles edited, 1 article added". */
 export function summarizeChanges(changes: ContractDocumentChange[]): string {
   if (changes.length === 0) return 'No changes';
@@ -148,6 +213,7 @@ export function summarizeChanges(changes: ContractDocumentChange[]): string {
 
   const counts = new Map<string, number>();
   const parts: string[] = [];
+  const fields: string[] = [];
 
   for (const change of changes) {
     const verb = articleVerbs[change.kind];
@@ -157,9 +223,19 @@ export function summarizeChanges(changes: ContractDocumentChange[]): string {
       parts.push('document title changed');
     } else if (change.kind === 'WHEREAS_CHANGED') {
       parts.push('recitals changed');
+    } else if (change.kind === 'FIELD_CHANGED') {
+      fields.push(change.label.toLowerCase());
     }
   }
 
+  if (fields.length > 0) {
+    parts.push(
+      fields.length <= 3
+        ? `${fields.join(', ')} changed`
+        : `${fields.length} contract fields changed`,
+    );
+  }
+
   const articleParts = [...counts.entries()].map(
     ([verb, count]) => `${count} article${count === 1 ? '' : 's'} ${verb}`,
   );