add export/inport number

apps/edr-freight-web/backoffice/src/pages/fleet/config/resources.ts

@@ -40,6 +40,13 @@ export interface FleetResourceColumn {
 export interface FleetFormFieldDef extends FormFieldDef {
   dynamicOptions?: FleetDynamicOptions;
   noneOption?: boolean;
+  /**
+   * Read-only field whose value is computed from the other fields rather than
+   * typed. Rendered non-editable and recomputed on every change, so the stored
+   * form value for this field is never trusted — the function is the source of
+   * truth at both render and submit.
+   */
+  derivedValue?: (values: Record<string, unknown>) => string;
   /**
    * Field is owned by the Fayda identity — populated only by verification and
    * never hand-edited. Rendered disabled in the form.
@@ -116,6 +123,32 @@ const WAGON_STATUS_OPTIONS = [
   { label: "Detained", value: Freight.WagonStatus.Detained },
 ];
 
+/**
+ * EDR run-number pairs, keyed by the odd EXPORT run (Ethiopia → Djibouti). The
+ * even IMPORT run (Djibouti → Ethiopia) is fixed by the export run, so choosing
+ * an export number fully determines the import one. Listed explicitly rather
+ * than computed as export+1, so a pair that ever breaks that convention stays
+ * correct here.
+ */
+const TRAIN_RUN_PAIRS: Record<string, string> = {
+  "8001": "8002",
+  "81001": "81002",
+  "82001": "82002",
+  "83001": "83002",
+  "84001": "84002",
+  "85001": "85002",
+  "86001": "86002",
+  "87001": "87002",
+  "88001": "88002",
+  "8901": "8902",
+  "9001": "9002",
+};
+
+const EXPORT_TRAIN_OPTIONS = Object.keys(TRAIN_RUN_PAIRS).map((run) => ({
+  label: run,
+  value: run,
+}));
+
 
 
 export const FLEET_RESOURCES: FleetResourceConfig[] = [
@@ -272,13 +305,15 @@ export const FLEET_RESOURCES: FleetResourceConfig[] = [
     ],
     formFields: [
       // Run numbers are optional — a wagon sits in the fleet unassigned to any
-      // run until an operator fills these in.
+      // run until an operator picks an export run. The import run is fixed by
+      // that choice, so it is derived rather than typed.
       {
         name: "exportTrainNumber",
         label: "Export train number",
-        type: "text",
+        type: "select",
         description: "Odd — Ethiopia → Djibouti runs",
         placeholder: "e.g. 8001",
+        options: EXPORT_TRAIN_OPTIONS,
       },
       {
         name: "importTrainNumber",
@@ -286,6 +321,8 @@ export const FLEET_RESOURCES: FleetResourceConfig[] = [
         type: "text",
         description: "Even — Djibouti → Ethiopia runs",
         placeholder: "e.g. 8002",
+        derivedValue: (values) =>
+          TRAIN_RUN_PAIRS[String(values.exportTrainNumber ?? "")] ?? "",
       },
       { name: "wagonNumber", label: "Wagon number", type: "text", required: true },
       { name: "wagonTypeId", label: "Wagon type", type: "select", required: true, dynamicOptions: "wagonTypes" },