Add unit preferences to user settings

supabase/functions/detect-location/index.ts

@@ -0,0 +1,84 @@
+import { serve } from "https://deno.land/std@0.168.0/http/server.ts";
+
+const corsHeaders = {
+  'Access-Control-Allow-Origin': '*',
+  'Access-Control-Allow-Headers': 'authorization, x-client-info, apikey, content-type',
+};
+
+interface IPLocationResponse {
+  country: string;
+  countryCode: string;
+  measurementSystem: 'metric' | 'imperial';
+}
+
+serve(async (req) => {
+  // Handle CORS preflight requests
+  if (req.method === 'OPTIONS') {
+    return new Response(null, { headers: corsHeaders });
+  }
+
+  try {
+    // Get the client's IP address
+    const forwarded = req.headers.get('x-forwarded-for');
+    const realIP = req.headers.get('x-real-ip');
+    const clientIP = forwarded?.split(',')[0] || realIP || '8.8.8.8'; // fallback to Google DNS for testing
+    
+    console.log('Detecting location for IP:', clientIP);
+
+    // Use a free IP geolocation service
+    const geoResponse = await fetch(`http://ip-api.com/json/${clientIP}?fields=status,country,countryCode`);
+    
+    if (!geoResponse.ok) {
+      throw new Error('Failed to fetch location data');
+    }
+    
+    const geoData = await geoResponse.json();
+    
+    if (geoData.status !== 'success') {
+      throw new Error('Invalid location data received');
+    }
+
+    // Countries that primarily use imperial system
+    const imperialCountries = ['US', 'LR', 'MM']; // USA, Liberia, Myanmar
+    const measurementSystem = imperialCountries.includes(geoData.countryCode) ? 'imperial' : 'metric';
+
+    const result: IPLocationResponse = {
+      country: geoData.country,
+      countryCode: geoData.countryCode,
+      measurementSystem
+    };
+
+    console.log('Location detected:', result);
+
+    return new Response(
+      JSON.stringify(result),
+      { 
+        headers: { 
+          ...corsHeaders, 
+          'Content-Type': 'application/json' 
+        } 
+      }
+    );
+
+  } catch (error) {
+    console.error('Error detecting location:', error);
+    
+    // Return default (metric) on error
+    const defaultResult: IPLocationResponse = {
+      country: 'Unknown',
+      countryCode: 'XX',
+      measurementSystem: 'metric'
+    };
+
+    return new Response(
+      JSON.stringify(defaultResult),
+      { 
+        headers: { 
+          ...corsHeaders, 
+          'Content-Type': 'application/json' 
+        },
+        status: 200 // Return 200 even on error to provide fallback
+      }
+    );
+  }
+});