//////////////////////////////
// POWER MACHINERY BASE CLASS
//////////////////////////////

/////////////////////////////
// Definitions
/////////////////////////////

/obj/structure/machinery/power
	name = null
	icon = 'icons/obj/power.dmi'
	anchored = 1.0
	var/datum/powernet/powernet = null
	use_power = POWER_USE_OFF
	idle_power_usage = 0
	active_power_usage = 0

/obj/structure/machinery/power/Destroy()
	disconnect_from_network()
	disconnect_terminal()

	return ..()

///////////////////////////////
// General procedures
//////////////////////////////
/**
 * Proc: power_wattage_readable()
 * Parameters: 1 (amount - Power in Watts to be converted to W, kW or MW)
 * Description: Helper proc that converts reading in Watts to kW or MW (returns string version of amount parameter)
 * NOTE: This needs to be replaced by a common SIUnits proc once energy is normalized (watts, volts, joules, etc.)
 */
/proc/power_wattage_readable(var/amount = 0)
	var/units = ""
	// 10kW and less - Watts
	if(amount < 10000)
		units = "W"
	// 10MW and less - KiloWatts
	else if(amount < 10000000)
		units = "kW"
		amount = (round(amount/100) / 10)
	// More than 10MW - MegaWatts
	else
		units = "MW"
		amount = (round(amount/10000) / 100)
	if (units == "W")
		return "[amount] W"
	else
		return "[amount] [units]"

/**
 * Proc: power_joules_readable()
 * Parameters: 1 (amount - Power in Joules to be converted to J, kJ or MJ)
 * Description: Helper proc that converts reading in Joules to kJ or MJ (returns string version of amount parameter)
 * NOTE: This needs to be replaced by a common SIUnits proc once energy is normalized (watts, volts, joules, etc.)
 */
/proc/power_joules_readable(var/amount = 0)
	var/units = ""
	// 10kW and less - Watts
	if(amount < 10000)
		units = "W"
	// 10MW and less - KiloWatts
	else if(amount < 10000000)
		units = "kJ"
		amount = (round(amount/100) / 10)
	// More than 10MW - MegaWatts
	else
		units = "MJ"
		amount = (round(amount/10000) / 100)
	if (units == "J")
		return "[amount] J"
	else
		return "[amount] [units]"

/// Machines without a terminal will just return, no harm no fowl.
/obj/structure/machinery/power/proc/disconnect_terminal()
	return

/// Connect the machine to a powernet if a node cable is present on the turf
/obj/structure/machinery/power/proc/connect_to_network()
	var/turf/T = src.loc
	if(!T || !istype(T))
		return 0

	var/obj/structure/cable/C = T.get_cable_node() //check if we have a node cable on the machine turf, the first found is picked
	if(!C || !C.powernet)
		return 0

	C.powernet.add_machine(src)
	return 1

/// Remove and disconnect the machine from its current powernet.
/obj/structure/machinery/power/proc/disconnect_from_network()
	if(!powernet)
		return 0
	powernet.remove_machine(src)
	return 1

/**
 * Attach a wire to a power machine - leads from the turf you are standing on
 * almost never called, overwritten by all power machines but terminal and generator
 */
/obj/structure/machinery/power/attackby(obj/item/attacking_item, mob/user)

	if(attacking_item.tool_behaviour == TOOL_CABLECOIL)

		var/obj/item/stack/cable_coil/coil = attacking_item

		var/turf/T = user.loc

		if(!T.is_plating() || !istype(T, /turf/simulated/floor))
			return

		if(get_dist(src, user) > 1)
			return

		coil.turf_place(T, user)
		return
	else
		..()
	return

///////////////////////////////////////////
// Powernet handling helpers
//////////////////////////////////////////

/// Returns all the cables WITHOUT a powernet in neighbors turfs,
/// pointing towards the turf the machine is located at.
/obj/structure/machinery/power/proc/get_connections()

	. = list()

	var/cdir
	var/turf/T

	for(var/card in GLOB.cardinals)
		T = get_step(loc,card)
		cdir = get_dir(T,loc)

		for(var/obj/structure/cable/C in T)
			if(C.powernet)	continue
			if(C.d1 == cdir || C.d2 == cdir)
				. += C
	return .

/// Returns all the cables in neighbors turfs,
/// pointing towards the turf the machine is located at
/obj/structure/machinery/power/proc/get_marked_connections()

	. = list()

	var/cdir
	var/turf/T

	for(var/card in GLOB.cardinals)
		T = get_step(loc,card)
		cdir = get_dir(T,loc)

		for(var/obj/structure/cable/C in T)
			if(C.d1 == cdir || C.d2 == cdir)
				. += C
	return .

/// Returns all the NODES (O-X) cables WITHOUT a powernet in the turf the machine is located at
/obj/structure/machinery/power/proc/get_indirect_connections()
	. = list()
	for(var/obj/structure/cable/C in loc)
		if(C.powernet)	continue
		if(C.d1 == 0) // the cable is a node cable
			. += C
	return .

///////////////////////////////////////////
// GLOBAL PROCS for powernets handling
//////////////////////////////////////////

/**
 * Returns a list of all power-related objects (nodes, cable, junctions) in turf,
 * excluding source, that match the direction d.
 * If unmarked==1, only return those with no powernet
 */
/proc/power_list(var/turf/T, var/source, var/d, var/unmarked=0, var/cable_only = 0)
	. = list()
	var/fdir = (!d)? 0 : turn(d, 180)			// the opposite direction to d (or 0 if d==0)
///// Z-Level Stuff
	var/Zdir
	if(d==11)
		Zdir = 11
	else if (d==12)
		Zdir = 12
	else
		Zdir = 999
///// Z-Level Stuff
	for(var/AM in T)
		if(AM == source)	continue			//we don't want to return source

		if(!cable_only && istype(AM,/obj/structure/machinery/power))
			var/obj/structure/machinery/power/P = AM
			if(P.powernet == 0)	continue		// exclude APCs which have powernet=0

			if(!unmarked || !P.powernet)		//if unmarked=1 we only return things with no powernet
				if(d == 0)
					. += P

		else if(istype(AM,/obj/structure/cable))
			var/obj/structure/cable/C = AM

			if(!unmarked || !C.powernet)
///// Z-Level Stuff
				if(C.d1 == fdir || C.d2 == fdir || C.d1 == Zdir || C.d2 == Zdir)
///// Z-Level Stuff
					. += C
				else if(C.d1 == d || C.d2 == d)
					. += C
	return .

/// Remove the old powernet and replace it with a new one throughout the network.
/proc/propagate_network(var/obj/O, var/datum/powernet/PN)
	//world.log <<  "propagating new network"
	var/list/worklist = list()
	var/list/found_machines = list()
	var/index = 1
	var/obj/P = null

	worklist+=O //start propagating from the passed object

	while(index<=worklist.len) //until we've exhausted all power objects
		P = worklist[index] //get the next power object found
		index++

		if( istype(P,/obj/structure/cable))
			var/obj/structure/cable/C = P
			if(C.powernet != PN) //add it to the powernet, if it isn't already there
				PN.add_cable(C)
			worklist |= C.get_connections() //get adjacents power objects, with or without a powernet

		else if(P.anchored && istype(P,/obj/structure/machinery/power))
			var/obj/structure/machinery/power/M = P
			found_machines |= M //we wait until the powernet is fully propagates to connect the machines

		else
			continue

	//now that the powernet is set, connect found machines to it
	for(var/obj/structure/machinery/power/PM in found_machines)
		if(!PM.connect_to_network()) //couldn't find a node on its turf...
			PM.disconnect_from_network() //... so disconnect if already on a powernet


/// Merge two powernets, the bigger (in cable length term) absorbing the other
/proc/merge_powernets(var/datum/powernet/net1, var/datum/powernet/net2)
	if(!net1 || !net2) //if one of the powernet doesn't exist, return
		return

	if(net1 == net2) //don't merge same powernets
		return

	//We assume net1 is larger. If net2 is in fact larger we are just going to make them switch places to reduce on code.
	if(net1.cables.len < net2.cables.len)	//net2 is larger than net1. Let's switch them around
		var/temp = net1
		net1 = net2
		net2 = temp

	//merge net2 into net1
	for(var/obj/structure/cable/Cable in net2.cables) //merge cables
		net1.add_cable(Cable)

	if(!net2) return net1

	for(var/obj/structure/machinery/power/Node in net2.nodes) //merge power machines
		if(!Node.connect_to_network())
			Node.disconnect_from_network() //if somehow we can't connect the machine to the new powernet, disconnect it from the old nonetheless

	return net1

/**
 * Determines how strong could be shock, deals damage to mob, uses power
 *
 * No animations will be performed by this proc
 *
 * * victim - The mob who has to be shocked
 * * power_source - is a source of electricity, can be power cell, area, apc, cable, powernet or null
 * * source - An object caused electrocuting (airlock, grille, etc)
 * * siemens_coeff - Layman's terms, conductivity
 * * contact_zone - Where the electrocution is happening, see BP_* defines in `code\__DEFINES\mobs.dm`
 *
 * Returns the amount of energy that was used to electrocute the mob, or `null` / `FALSE` if the electrocution didn't happen
 */
/proc/electrocute_mob(mob/living/carbon/victim, power_source, obj/source, siemens_coeff = 1.0, contact_zone = "hand")

	if (!victim)
		return 0
	var/area/source_area
	if(istype(power_source,/area))
		source_area = power_source
		power_source = source_area.get_apc()
	if(istype(power_source,/obj/structure/cable))
		var/obj/structure/cable/Cable = power_source
		power_source = Cable.powernet

	var/datum/powernet/PN
	var/obj/item/cell/cell

	if(istype(power_source,/datum/powernet))
		PN = power_source
	else if(istype(power_source,/obj/item/cell))
		cell = power_source
	else if(istype(power_source,/obj/structure/machinery/power/apc))
		var/obj/structure/machinery/power/apc/apc = power_source
		cell = apc.cell
		if (apc.terminal)
			PN = apc.terminal.powernet
	else if (!power_source)
		return FALSE
	else
		log_admin("ERROR: /proc/electrocute_mob([victim], [power_source], [source]): wrong power_source")
		return FALSE
	//Triggers powernet warning, but only for 5 ticks (if applicable)
	//If following checks determine user is protected we won't alarm for long.
	if(PN)
		PN.trigger_warning(5)
	var/mob/living/carbon/human/H
	if(ishuman(victim))
		H = victim
	if(H)
		if(H.species.siemens_coefficient == 0)
			return
		if(H.species.is_naturally_insulated())
			return
		if(H.gloves && contact_zone == "hand")
			var/obj/item/clothing/gloves/G = H.gloves
			if(G.siemens_coefficient == 0)	return 0		//to avoid spamming with insulated glvoes on

	//Checks again. If we are still here subject will be shocked, trigger standard 20 tick warning
	//Since this one is longer it will override the original one.
	if(PN)
		PN.trigger_warning()

	if (!cell && !PN)
		return 0
	var/PN_damage = 0
	var/cell_damage = 0
	if (PN)
		PN_damage = PN.get_electrocute_damage()
	if (cell)
		cell_damage = cell.get_electrocute_damage()
	var/shock_damage = 0
	if (PN_damage>=cell_damage)
		power_source = PN
		shock_damage = PN_damage
	else
		power_source = cell
		shock_damage = cell_damage
	var/drained_hp
	var/touchy_hand
	if(contact_zone == "hand")
		if(victim.hand)
			touchy_hand = BP_R_HAND
		else
			touchy_hand = BP_L_HAND
	if(!touchy_hand)
		drained_hp = victim.electrocute_act(shock_damage, source, siemens_coeff, ground_zero = contact_zone) //zzzzzzap!
	else
		drained_hp = victim.electrocute_act(shock_damage, source, siemens_coeff, ground_zero = touchy_hand) //zzzzzzap!
	var/drained_energy = drained_hp*20

	if (source_area)
		source_area.use_power_oneoff(drained_energy/CELLRATE)
	else if (istype(power_source,/datum/powernet))
		var/drained_power = drained_energy/CELLRATE
		drained_power = POWERNET_POWER_DRAW(PN, drained_power)
		DRAW_FROM_POWERNET(PN, drained_power)
	else if (istype(power_source, /obj/item/cell))
		cell.use(drained_energy)
	return drained_energy