Replaces add_load with draw_power. Issue about silly battery handling remains. Fixes the build-error.

code/game/area/areas.dm

@@ -273,7 +273,6 @@
 	master.used_environ = 0
 
 /area/proc/use_power(var/amount, var/chan)
-
 	switch(chan)
 		if(EQUIP)
 			master.used_equip += amount

code/modules/power/apc.dm

@@ -1040,9 +1040,10 @@
 	else
 		return 0
 
-/obj/machinery/power/apc/add_load(var/amount)
+/obj/machinery/power/apc/draw_power(var/amount)
 	if(terminal && terminal.powernet)
-		terminal.powernet.load += amount
+		return terminal.powernet.draw_power(amount)
+	return 0
 
 /obj/machinery/power/apc/avail()
 	if(terminal)
@@ -1057,20 +1058,10 @@
 	if(!area.requires_power)
 		return
 
-
-	/*
-	if (equipment > 1) // off=0, off auto=1, on=2, on auto=3
-		use_power(src.equip_consumption, EQUIP)
-	if (lighting > 1) // off=0, off auto=1, on=2, on auto=3
-		use_power(src.light_consumption, LIGHT)
-	if (environ > 1) // off=0, off auto=1, on=2, on auto=3
-		use_power(src.environ_consumption, ENVIRON)
-
-	area.calc_lighting() */
 	lastused_light = area.usage(LIGHT)
 	lastused_equip = area.usage(EQUIP)
 	lastused_environ = area.usage(ENVIRON)
-	area.clear_usage()
+	// area.clear_usage()
 
 	lastused_total = lastused_light + lastused_equip + lastused_environ
 
@@ -1100,17 +1091,14 @@
 		cell.use(cellused)
 
 		if(excess > lastused_total)		// if power excess recharge the cell
-										// by the same amount just used
-			cell.give(cellused)
-			add_load(cellused/CELLRATE)		// add the load used to recharge the cell
-
-
+			var/actual_gain = draw_power(cellused/CELLRATE)		// add the load used to recharge the cell
+			cell.give(actual_gain)								// by the same amount just used
 		else		// no excess, and not enough per-apc
 
 			if( (cell.charge/CELLRATE + excess) >= lastused_total)		// can we draw enough from cell+grid to cover last usage?
 
 				cell.charge = min(cell.maxcharge, cell.charge + CELLRATE * excess)	//recharge with what we can
-				add_load(excess)		// so draw what we can from the grid
+				draw_power(excess)		// so draw what we can from the grid
 				charging = 0
 
 			else	// not enough power available to run the last tick!
@@ -1159,8 +1147,8 @@
 			if(excess > 0)		// check to make sure we have enough to charge
 				// Max charge is capped to % per second constant
 				var/ch = min(excess*CELLRATE, cell.maxcharge*CHARGELEVEL)
-				add_load(ch/CELLRATE) // Removes the power we're taking from the grid
-				cell.give(ch) // actually recharge the cell
+				var/actual_charge = draw_power(ch/CELLRATE) // Removes the power we're taking from the grid
+				cell.give(actual_charge) // actually recharge the cell
 
 			else
 				charging = 0		// stop charging

code/modules/power/batteryrack.dm

@@ -241,7 +241,7 @@
 	if(terminal)
 		if(chargemode)
 			var/target_load = min((capacity-charge)/SMESRATE, chargelevel)		// charge at set rate, limited to spare capacity
-			var/actual_load = add_load(target_load)		// add the load to the terminal side network
+			var/actual_load = draw_power(target_load)		// add the load to the terminal side network
 			charge += actual_load * SMESRATE	// increase the charge
 
 			if (actual_load >= target_load) // did the powernet have enough power available for us?
@@ -249,10 +249,6 @@
 			else
 				charging = 0
 
-		else
-			if (chargemode && excess > 0 && excess >= chargelevel)
-				charging = 1
-
 	if(online)		// if outputting
 		lastout = min( charge/SMESRATE, output)		//limit output to that stored
 		charge -= lastout*SMESRATE		// reduce the storage (may be recovered in /restore() if excessive)

code/modules/power/power.dm

@@ -28,7 +28,7 @@
 	if(powernet)
 		powernet.newavail += amount
 
-/obj/machinery/power/proc/add_load(var/amount)
+/obj/machinery/power/proc/draw_power(var/amount)
 	if(powernet)
 		return powernet.draw_power(amount)
 	return 0

code/modules/power/powernet.dm

@@ -16,7 +16,7 @@
 	powernets -= src
 
 /datum/powernet/proc/draw_power(var/amount)
-	var/draw = min(amount, avail - load, 0)
+	var/draw = between(0, amount, avail - load)
 	load += draw
 	return draw
 

code/modules/power/singularity/emitter.dm

@@ -105,7 +105,8 @@
 		return
 	if(((src.last_shot + src.fire_delay) <= world.time) && (src.active == 1))
 
-		if(surplus() >= active_power_usage && add_load(active_power_usage) >= active_power_usage) //does the laser have enough power to shoot?
+		var/actual_load = draw_power(active_power_usage)
+		if(actual_load >= active_power_usage) //does the laser have enough power to shoot?
 			if(!powered)
 				powered = 1
 				update_icon()

code/modules/power/smes.dm

@@ -92,7 +92,7 @@
 		//TODO: Add a meter to tell players how much charge we are actually getting, and only set charging to 0 when we are unable to get any charge at all.
 		if(chargemode)
 			var/target_load = min((capacity-charge)/SMESRATE, chargelevel)		// charge at set rate, limited to spare capacity
-			var/actual_load = add_load(target_load)		// add the load to the terminal side network
+			var/actual_load = draw_power(target_load)		// add the load to the terminal side network
 			charge += actual_load * SMESRATE	// increase the charge
 
 			if (actual_load >= target_load) // did the powernet have enough power available for us?
@@ -174,7 +174,7 @@
 	return 1
 
 
-/obj/machinery/power/smes/add_load(var/amount)
+/obj/machinery/power/smes/draw_power(var/amount)
 	if(terminal && terminal.powernet)
 		return terminal.powernet.draw_power(amount)
 	return 0