Update: 2026-06-21 02:07:00

backend/ride/heatmap/heatmap_live.php

@@ -0,0 +1,72 @@
+<?php
+require_once __DIR__ . '/../connect.php';
+
+// If Main Redis is not available, return empty array
+if (!isset($redis) || $redis === null) {
+    echo json_encode([]);
+    exit();
+}
+
+$grid_size = 0.0135;
+$keys = [];
+
+try {
+    // Prefix 'siro:' is automatically applied by $redis
+    $keys = $redis->keys("demand:grid:*");
+} catch (Exception $e) {
+    error_log("[heatmap_live.php] Redis keys error: " . $e->getMessage());
+    echo json_encode([]);
+    exit();
+}
+
+$heatmap_data = [];
+
+foreach ($keys as $key) {
+    // The keys returned by $redis->keys() will actually contain the 'siro:' prefix
+    // e.g. siro:demand:grid:33.5135_36.2735
+    $parts = explode(":", $key);
+    $coords = explode("_", end($parts));
+    
+    if (count($coords) == 2) {
+        $lat = (float)$coords[0];
+        $lng = (float)$coords[1];
+        
+        // We must strip 'siro:' to use $redis->get() because $redis auto-prefixes everything!
+        // Actually, $redis->keys() returns the physical key "siro:demand:grid:X"
+        // But $redis->get("demand:grid:X") automatically prepends "siro:".
+        // So we must strip the "siro:" part before passing to get()
+        $clean_key = str_replace("siro:", "", $key);
+        $count = (int)$redis->get($clean_key);
+        
+        // Fetch active drivers using Location Redis
+        $available_drivers = 0;
+        try {
+            global $redisLocation;
+            if (isset($redisLocation) && $redisLocation !== null) {
+                $drivers = $redisLocation->georadius('geo:drivers:available', $lng, $lat, 0.75, 'km');
+                $availableDrivers = count($drivers);
+            }
+        } catch (Exception $e) {}
+
+        $intensity = 'low';
+        $surge_ratio = ($available_drivers > 0) ? ($count / $available_drivers) : $count;
+
+        if ($surge_ratio > 2.0 || $count >= 5) {
+            $intensity = 'high';
+        } else if ($surge_ratio > 1.2 || $count >= 3) {
+            $intensity = 'medium';
+        }
+
+        $heatmap_data[] = [
+            "lat" => $lat,
+            "lng" => $lng,
+            "count" => $count,
+            "intensity" => $intensity
+        ];
+    }
+}
+
+// Output the JSON array as expected by home_captain_controller.dart
+header('Content-Type: application/json');
+echo json_encode($heatmap_data);
+?>

backend/ride/heatmap/log_demand.php

@@ -0,0 +1,43 @@
+<?php
+require_once __DIR__ . '/../connect.php';
+
+$lat = filterRequest("lat");
+$lng = filterRequest("lng");
+
+if (!$lat || !$lng) {
+    jsonError("Missing coordinates");
+    exit();
+}
+
+if (!isset($redis) || $redis === null) {
+    // If Redis is not available, we fail gracefully.
+    jsonSuccess(null, "Demand logged (fallback)");
+    exit();
+}
+
+// Create a 1.5 km grid cell
+// 1 degree latitude is approximately 111 km. 
+// 1.5 km / 111 km ≈ 0.0135 degrees.
+$grid_size = 0.0135;
+
+$grid_lat = round((float)$lat / $grid_size) * $grid_size;
+$grid_lng = round((float)$lng / $grid_size) * $grid_size;
+
+$grid_id = $grid_lat . "_" . $grid_lng;
+$redisKey = "demand:grid:" . $grid_id;
+
+try {
+    // Increment the demand count for this grid
+    $currentCount = $redis->incr($redisKey);
+    
+    // If this is the first request, set the expiry to 60 seconds
+    if ($currentCount == 1) {
+        $redis->expire($redisKey, 60);
+    }
+    
+    jsonSuccess(["grid_id" => $grid_id, "count" => $currentCount], "Demand logged successfully");
+} catch (Exception $e) {
+    error_log("[log_demand.php] Redis error: " . $e->getMessage());
+    jsonError("Error logging demand");
+}
+?>