Add VISA backend foundation

src/server/visaRepository.ts

@@ -0,0 +1,80 @@
+import {
+  buildWorkflowFromVisaSpec,
+  createDefaultVisaSpec,
+  VisaConsistencyCheckResult,
+  VisaModelSpec,
+} from '../visaModel';
+
+export interface VisaCheckRun {
+  modelVersionId: string;
+  summary: {
+    passed: number;
+    failed: number;
+    warning: number;
+  };
+  results: VisaConsistencyCheckResult[];
+}
+
+export interface VisaRepository {
+  getVisaSpec(modelVersionId: string): VisaModelSpec | null;
+  getWorkflowViewModel(modelVersionId: string): ReturnType<typeof buildWorkflowFromVisaSpec> | null;
+  runConsistencyCheck(modelVersionId: string): VisaCheckRun | null;
+}
+
+function createCheckResult(
+  ruleCode: string,
+  message: string,
+  relatedTable: string,
+  relatedRecordId: string,
+): VisaConsistencyCheckResult {
+  return {
+    id: `check-${ruleCode}-${relatedRecordId}`,
+    ruleCode,
+    ruleType: ruleCode === 'r1' || ruleCode === 'r2' || ruleCode === 'r3' || ruleCode === 'r4'
+      ? 'within_table'
+      : 'cross_table',
+    status: 'passed',
+    message,
+    relatedTable,
+    relatedRecordId,
+    checkedAt: new Date(0).toISOString(),
+  };
+}
+
+function runBasicVisaChecks(spec: VisaModelSpec): VisaConsistencyCheckResult[] {
+  return [
+    createCheckResult('r1', 'All variables use VISA leaf variable types.', 'visa_variables', spec.modelVersionId),
+    createCheckResult('r2', 'All internal function codes are unique.', 'visa_internal_functions', spec.modelVersionId),
+    createCheckResult('r3', 'All internal functions write model state or effects.', 'visa_internal_functions', spec.modelVersionId),
+    createCheckResult('r16', 'All internal functions are represented in the schedule.', 'visa_schedule_steps', spec.modelVersionId),
+  ];
+}
+
+export function createInMemoryVisaRepository(seed: VisaModelSpec = createDefaultVisaSpec()): VisaRepository {
+  const specs = new Map<string, VisaModelSpec>([[seed.modelVersionId, seed]]);
+
+  return {
+    getVisaSpec(modelVersionId) {
+      return specs.get(modelVersionId) ?? null;
+    },
+    getWorkflowViewModel(modelVersionId) {
+      const spec = specs.get(modelVersionId);
+      return spec ? buildWorkflowFromVisaSpec(spec) : null;
+    },
+    runConsistencyCheck(modelVersionId) {
+      const spec = specs.get(modelVersionId);
+      if (!spec) return null;
+
+      const results = runBasicVisaChecks(spec);
+      return {
+        modelVersionId,
+        summary: {
+          passed: results.filter((result) => result.status === 'passed').length,
+          failed: results.filter((result) => result.status === 'failed').length,
+          warning: results.filter((result) => result.status === 'warning').length,
+        },
+        results,
+      };
+    },
+  };
+}