From 72e610f814d3658f52e906924a854cdf8eec3b57 Mon Sep 17 00:00:00 2001
From: SinusFox <61253950+SinusFox@users.noreply.github.com>
Date: Thu, 3 Oct 2024 22:29:19 +0200
Subject: [PATCH] fixing further errors

---
 src/app/scripts.ts           |  2 +-
 src/pages/api/optimizeLP.ts  | 12 ++++++---
 src/pages/api/optimizeMIP.ts | 48 ++++++++++++++++++++++++++++++------
 3 files changed, 50 insertions(+), 12 deletions(-)

diff --git a/src/app/scripts.ts b/src/app/scripts.ts
index 8f30b86..899be06 100644
--- a/src/app/scripts.ts
+++ b/src/app/scripts.ts
@@ -199,7 +199,7 @@ function run(text: string) {
   customLog("");
 }
 
-function downloadLPFormatting(objective: string, subject: any, bounds: any) {
+function downloadLPFormatting(objective: any, subject: any, bounds: any) {
   customLog("Preparing file content string...<br>");
   
   // ensure that all vars are strings
diff --git a/src/pages/api/optimizeLP.ts b/src/pages/api/optimizeLP.ts
index 330ba08..d14af69 100644
--- a/src/pages/api/optimizeLP.ts
+++ b/src/pages/api/optimizeLP.ts
@@ -44,9 +44,15 @@ export default async function handler(req: NextApiRequest, res: NextApiResponse)
                 ${problem.subjectTo.map((c: any) => `${c.vars.map((v: any) => `${v.coef} ${v.name}`).join(' + ')} ${c.bnds.ub ? `<= ${c.bnds.ub}` : ''}`).join('\n')}\n`;
 
             res.status(200).json({ result, lpFormat });
-        } catch (error) {
-            console.error('Error processing optimization:', error);
-            res.status(500).json({ message: 'Error processing optimization', error: error.message });
+        } catch (error: unknown) {
+            // Type Assertion to access properties of the error object
+            if (error instanceof Error) {
+                console.error('Error processing optimization:', error);
+                res.status(500).json({ message: 'Error processing optimization', error: error.message });
+            } else {
+                console.error('Unknown error:', error);
+                res.status(500).json({ message: 'Error processing optimization', error: 'Unknown error' });
+            }
         }
     } else {
         res.status(405).json({ message: 'Only POST method is allowed' });
diff --git a/src/pages/api/optimizeMIP.ts b/src/pages/api/optimizeMIP.ts
index 3ff00b4..38b6da6 100644
--- a/src/pages/api/optimizeMIP.ts
+++ b/src/pages/api/optimizeMIP.ts
@@ -1,9 +1,34 @@
 import { NextApiRequest, NextApiResponse } from 'next';
 import GLPK from 'glpk.js';
 
+interface Variable {
+    name: string;
+    coef: number;
+}
+
+interface Constraint {
+    name: string;
+    vars: Variable[];
+    bnds: {
+        lb: number;
+        ub: number;
+    };
+}
+
+interface Objective {
+    direction: 'max' | 'min';
+    vars: Variable[];
+}
+
+interface RequestBody {
+    objective: Objective;
+    constraints: Constraint[];
+    bounds?: any;
+}
+
 export default async function handler(req: NextApiRequest, res: NextApiResponse) {
     if (req.method === 'POST') {
-        const { objective, constraints, bounds } = req.body;
+        const { objective, constraints, bounds }: RequestBody = req.body;
 
         if (!objective || !constraints) {
             return res.status(400).json({ message: 'Invalid input data. Ensure that "objective" and "constraints" are provided correctly.' });
@@ -18,25 +43,32 @@ export default async function handler(req: NextApiRequest, res: NextApiResponse)
                 objective: {
                     direction: objective.direction === 'max' ? glpk.GLP_MAX : glpk.GLP_MIN,
                     name: 'obj',
-                    vars: objective.vars.map(v => ({ name: v.name, coef: v.coef }))
+                    vars: objective.vars.map((v: Variable) => ({ name: v.name, coef: v.coef }))
                 },
-                subjectTo: constraints.map(c => ({
+                subjectTo: constraints.map((c: Constraint) => ({
                     name: c.name,
-                    vars: c.vars.map(v => ({ name: v.name, coef: v.coef })),
+                    vars: c.vars.map((v: Variable) => ({ name: v.name, coef: v.coef })),
                     bnds: {
                         type: glpk.GLP_UP,
                         lb: c.bnds.lb,
                         ub: c.bnds.ub
                     }
                 })),
-                binaries: objective.vars.map(v => v.name),
-                generals: objective.vars.map(v => v.name)
+                binaries: objective.vars.map((v: Variable) => v.name),
+                generals: objective.vars.map((v: Variable) => v.name)
             };
 
             const result = glpk.solve(problem, options);
             res.status(200).json({ result });
-        } catch (error) {
-            res.status(500).json({ message: 'Error processing optimization', error: error.message });
+        } catch (error: unknown) {
+            // Type Assertion to access properties of the error object
+            if (error instanceof Error) {
+                console.error('Error processing optimization:', error);
+                res.status(500).json({ message: 'Error processing optimization', error: error.message });
+            } else {
+                console.error('Unknown error:', error);
+                res.status(500).json({ message: 'Error processing optimization', error: 'Unknown error' });
+            }
         }
     } else {
         res.status(405).json({ message: 'Only POST method is allowed' });