Support for many thermostats

Uses the device ID to support several thermostats. Pretty simple - only
setup is now an array of devices, now a single device. However, many
changes follow...

calc_delay.php

@@ -0,0 +1,94 @@
+<?php
+include('settings/globals.php');
+
+if(in_array(THERMOSTAT_TYPE,$valid_thermostats)){
+    require('thermostats/'.THERMOSTAT_TYPE.'/scrape.php');    
+    require('thermostats/'.THERMOSTAT_TYPE.'/logininfo.php');  
+} else{
+    die("Invalid THERMOSTAT_TYPE set in settings/globals.php");
+}
+
+$d = $device_array[$_GET['id']]; // device ID we are calculating this for
+
+include('settings/globals.php');
+header('Content-Type: application/json');
+$conn = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);
+// Check connection
+if (!$conn) {
+	die("Connection failed: " . mysqli_connect_error());
+}
+
+$sql = 'SELECT UNIX_TIMESTAMP(date),dispTemperature,weatherTemperature,heatSetPoint,systemSwitchPosition from stat WHERE deviceID=' . $d; // note filter for ID
+
+$result = $conn->query($sql);
+if (!$result) {
+printf("Errormessage: %s\n", $conn->error);
+}
+$rows = array();
+while($r = mysqli_fetch_assoc($result)) {
+	$r['date'] = $r['UNIX_TIMESTAMP(date)'];
+	unset($r['UNIX_TIMESTAMP(date)']);
+	$rows[] = $r;
+}
+// print("<pre>");
+// print_r($rows);
+$startTime = -1;
+$startTemp = NULL;
+$startSetPoint = NULL;
+$targetSetPoint = NULL;
+
+$heat_up = NULL;
+$heat_down = NULL;
+$cool_up = NULL;
+$cool_down = NULL;
+$type = NULL;
+
+for($i = 1; $i < count($rows); $i++){
+	$now = $rows[$i];
+	$last= $rows[$i-1];
+// 	echo $startTime;
+// print_r($now);
+	if($startTime == -1){
+// 		echo "no start <br/>";
+		if($now['heatSetPoint'] <> $last['heatSetPoint']){
+			//Down!
+// 			echo "down<br/>";
+			$startTime = $now['date'];
+			$startTemp = $now['dispTemperature'];
+			$startSetPoint = $last['heatSetPoint'];	
+			$targetSetPoint = $now['heatSetPoint'];
+			if($now['heatSetPoint'] > $last['heatSetPoint']){
+				$type = "up";
+			} else {
+				$type = "down";
+			}
+		} 
+	} else{
+		//looking for end
+// 		echo "yes start <br/>";
+		if($now['dispTemperature'] == $targetSetPoint || $now['heatSetPoint'] <> $targetSetPoint){
+			$changeTime = ($now['date']-$startTime)/60;
+			$changeTemp = abs($startTemp - $now['dispTemperature']);
+			$outside = $now['weatherTemperature'];
+			$minperdeg = $changeTime/$changeTemp;
+			
+			if($type == "up"){
+				$heat_up[] = [$minperdeg,intval($outside)];
+			} else{
+				$heat_down[] = [$minperdeg,intval($outside)];
+			}
+						
+			$startTime = -1;
+		}
+	}
+	
+}
+
+$return = [$heat_up, $heat_down];
+
+print json_encode($return);
+
+
+$conn->close();
+
+?>