Add Year-Based Routing for Provincial and Municipal Jurisdictions

next.config.ts

@@ -1,6 +1,10 @@
 import type { NextConfig } from "next";
 import createMDX from "@next/mdx";
 import rehypeSlug from "rehype-slug";
+import {
+  getProvincialSlugs,
+  getMunicipalitiesByProvince,
+} from "./src/lib/jurisdictions";
 
 const nextConfig: NextConfig = {
   /* config options here */
@@ -36,13 +40,85 @@ const nextConfig: NextConfig = {
     return config;
   },
   async redirects() {
-    return [
+    const redirects: Array<{
+      source: string;
+      destination: string;
+      permanent: boolean;
+    }> = [
+      // Permanent redirects (keep these)
       {
         source: "/:locale/tax-calculator",
         destination: "/:locale/tax-visualizer",
         permanent: true,
       },
     ];
+
+    // ========================================================================
+    // TEMPORARY REDIRECTS FOR OLD URL STRUCTURE
+    // TODO: REMOVE AFTER 2026-03-01
+    // These redirects support backward compatibility for the old URL structure
+    // that existed before the provincial/municipal/federal restructuring.
+    // After March 1, 2026, these can be safely removed as users will have
+    // had sufficient time to update bookmarks and external links.
+    // ========================================================================
+
+    // Load jurisdiction data (uses cached static-data.json internally)
+    const provinces = getProvincialSlugs();
+    const municipalitiesByProvince = getMunicipalitiesByProvince();
+
+    // Redirect old federal spending/budget URLs to new structure
+    redirects.push(
+      {
+        source: "/:locale/spending",
+        destination: "/:locale/federal/spending",
+        permanent: true,
+      },
+      {
+        source: "/:locale/budget",
+        destination: "/:locale/federal/budget",
+        permanent: true,
+      },
+    );
+
+    // Add redirects for old provincial URLs
+    for (const province of provinces) {
+      redirects.push(
+        {
+          source: `/:locale/${province}`,
+          destination: `/:locale/provincial/${province}`,
+          permanent: true,
+        },
+        {
+          source: `/:locale/${province}/:department*`,
+          destination: `/:locale/provincial/${province}/:department*`,
+          permanent: true,
+        },
+      );
+    }
+
+    // Add redirects for old municipal URLs
+    for (const { province, municipalities } of municipalitiesByProvince) {
+      for (const municipality of municipalities) {
+        redirects.push(
+          {
+            source: `/:locale/${municipality.slug}`,
+            destination: `/:locale/municipal/${province}/${municipality.slug}`,
+            permanent: true,
+          },
+          {
+            source: `/:locale/${municipality.slug}/:path*`,
+            destination: `/:locale/municipal/${province}/${municipality.slug}/:path*`,
+            permanent: true,
+          },
+        );
+      }
+    }
+
+    // ========================================================================
+    // END TEMPORARY REDIRECTS - REMOVE AFTER 2026-03-01
+    // ========================================================================
+
+    return redirects;
   },
   async rewrites() {
     return [