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Author: Your GitHub Username

index.js

@@ -1,23 +1,104 @@
 const express = require('express');
 const cors = require('cors');
+const AvailabilityService = require('./services/availabilityService');
+
 const app = express();
 const port = 3000;
 
 app.use(cors());
 app.use(express.json());
 
 app.get('/', (req, res) => {
-  res.json({ 
-    project: 'LeaseFlow Protocol', 
+  res.json({
+    project: 'LeaseFlow Protocol',
     status: 'Active',
     contract_id: 'CAEGD57WVTVQSYWYB23AISBW334QO7WNA5XQ56S45GH6BP3D2AVHKUG4'
   });
 });
 
+app.get('/api/asset/:id/availability', async (req, res) => {
+  try {
+    const { id } = req.params;
+
+    if (!id || isNaN(id)) {
+      return res.status(400).json({
+        error: 'Invalid asset ID. Must be a number.',
+        code: 'INVALID_ASSET_ID'
+      });
+    }
+
+    const availability = await availabilityService.getAssetAvailability(id);
+
+    res.json({
+      success: true,
+      data: availability
+    });
+
+  } catch (error) {
+    console.error(`Error fetching availability for asset ${req.params.id}:`, error);
+
+    res.status(500).json({
+      error: 'Failed to fetch asset availability',
+      code: 'FETCH_ERROR',
+      details: process.env.NODE_ENV === 'development' ? error.message : undefined
+    });
+  }
+});
+
+app.get('/api/assets/availability', async (req, res) => {
+  try {
+    const { ids } = req.query;
+
+    if (ids) {
+      const assetIds = ids.split(',').map(id => id.trim()).filter(id => id && !isNaN(id));
+
+      if (assetIds.length === 0) {
+        return res.status(400).json({
+          error: 'No valid asset IDs provided',
+          code: 'INVALID_ASSET_IDS'
+        });
+      }
+
+      const availability = await availabilityService.getMultipleAssetAvailability(assetIds);
+
+      res.json({
+        success: true,
+        data: availability
+      });
+    } else {
+      const availability = await availabilityService.getAllAssetsAvailability();
+
+      res.json({
+        success: true,
+        data: availability
+      });
+    }
+
+  } catch (error) {
+    console.error('Error fetching assets availability:', error);
+
+    res.status(500).json({
+      error: 'Failed to fetch assets availability',
+      code: 'FETCH_ERROR',
+      details: process.env.NODE_ENV === 'development' ? error.message : undefined
+    });
+  }
+});
+
 if (require.main === module) {
-  app.listen(port, () => {
-    console.log(`LeaseFlow Backend listening at http://localhost:${port}`);
+  const availabilityService = new AvailabilityService();
+
+  availabilityService.initialize().then(() => {
+    app.locals.availabilityService = availabilityService;
+    app.listen(port, () => {
+      console.log(`LeaseFlow Backend listening at http://localhost:${port}`);
+      console.log('Availability Service started');
+    });
+  }).catch(error => {
+    console.error('Failed to initialize Availability Service:', error);
+    process.exit(1);
   });
 }
 
+const availabilityService = new AvailabilityService();
 module.exports = app;

package-lock.json

@@ -8,6 +8,7 @@
     "test": "jest"
   },
   "dependencies": {
+    "algosdk": "^2.0.0",
     "cors": "^2.8.6",
     "dotenv": "^17.3.1",
     "express": "^5.2.1"
@@ -16,4 +17,4 @@
     "jest": "^30.3.0",
     "supertest": "^7.2.2"
   }
-}
+}