/*
	Click code cleanup
	~Sayu
*/

// 1 decisecond click delay (above and beyond mob/next_move)
//This is mainly modified by click code, to modify click delays elsewhere, use next_move and changeNext_move()
/mob/var/next_click	= 0

// THESE DO NOT EFFECT THE BASE 1 DECISECOND DELAY OF NEXT_CLICK
/mob/var/next_move_adjust = 0 //Amount to adjust action/click delays by, + or -
/mob/var/next_move_modifier = 1 //Value to multiply action/click delays by


//Delays the mob's next click/action by num deciseconds
// eg: 10-3 = 7 deciseconds of delay
// eg: 10*0.5 = 5 deciseconds of delay
// DOES NOT EFFECT THE BASE 1 DECISECOND DELAY OF NEXT_CLICK

/mob/proc/changeNext_move(num)
	next_move = world.time + ((num+next_move_adjust)*next_move_modifier)

/mob/living/changeNext_move(num)
	var/mod = next_move_modifier
	var/adj = next_move_adjust
	for(var/i in status_effects)
		var/datum/status_effect/S = i
		mod *= S.nextmove_modifier()
		adj += S.nextmove_adjust()
	next_move = world.time + ((num + adj)*mod)

/*
	Before anything else, defer these calls to a per-mobtype handler.  This allows us to
	remove istype() spaghetti code, but requires the addition of other handler procs to simplify it.

	Alternately, you could hardcode every mob's variation in a flat ClickOn() proc; however,
	that's a lot of code duplication and is hard to maintain.

	Note that this proc can be overridden, and is in the case of screen objects.
*/
/atom/Click(location,control,params)
	if(flags_1 & INITIALIZED_1)
		SEND_SIGNAL(src, COMSIG_CLICK, location, control, params, usr)
		usr.ClickOn(src, params)

/atom/DblClick(location,control,params)
	if(flags_1 & INITIALIZED_1)
		usr.DblClickOn(src,params)

/atom/MouseWheel(delta_x,delta_y,location,control,params)
	if(flags_1 & INITIALIZED_1)
		usr.MouseWheelOn(src, delta_x, delta_y, params)

/*
	Standard mob ClickOn()
	Handles exceptions: Buildmode, middle click, modified clicks, mech actions

	After that, mostly just check your state, check whether you're holding an item,
	check whether you're adjacent to the target, then pass off the click to whoever
	is receiving it.
	The most common are:
	* mob/UnarmedAttack(atom,adjacent) - used here only when adjacent, with no item in hand; in the case of humans, checks gloves
	* atom/attackby(item,user) - used only when adjacent
	* item/afterattack(atom,user,adjacent,params) - used both ranged and adjacent
	* mob/RangedAttack(atom,params) - used only ranged, only used for tk and laser eyes but could be changed
*/
/mob/proc/ClickOn( atom/A, params )
	if(world.time <= next_click)
		return
	next_click = world.time + 1

	if(check_click_intercept(params,A))
		return

	if(notransform)
		return

	var/list/modifiers = params2list(params)
	if(modifiers["shift"] && modifiers["middle"])
		ShiftMiddleClickOn(A)
		return
	if(modifiers["shift"] && modifiers["ctrl"])
		CtrlShiftClickOn(A)
		return
	if(modifiers["middle"])
		MiddleClickOn(A)
		return
	if(modifiers["shift"])
		ShiftClickOn(A)
		return
	if(modifiers["alt"]) // alt and alt-gr (rightalt)
		AltClickOn(A)
		return
	if(modifiers["ctrl"])
		CtrlClickOn(A)
		return

	if(incapacitated(ignore_restraints = 1))
		return

	face_atom(A)

	if(next_move > world.time) // in the year 2000...
		return

	if(!modifiers["catcher"] && A.IsObscured())
		return

	if(ismecha(loc))
		var/obj/mecha/M = loc
		return M.click_action(A,src,params)

	if(restrained())
		changeNext_move(CLICK_CD_HANDCUFFED)   //Doing shit in cuffs shall be vey slow
		RestrainedClickOn(A)
		return

	if(in_throw_mode)
		throw_item(A)
		return

	var/obj/item/W = get_active_held_item()

	if(W == A)
		W.attack_self(src)
		update_inv_hands()
		return

	//These are always reachable.
	//User itself, current loc, and user inventory
	if(A in DirectAccess())
		if(W)
			W.melee_attack_chain(src, A, params)
		else
			if(ismob(A))
				changeNext_move(CLICK_CD_MELEE)
			UnarmedAttack(A)
		return

	//Can't reach anything else in lockers or other weirdness
	if(!loc.AllowClick())
		return

	//Standard reach turf to turf or reaching inside storage
	if(CanReach(A,W))
		if(W)
			W.melee_attack_chain(src, A, params)
		else
			if(ismob(A))
				changeNext_move(CLICK_CD_MELEE)
			UnarmedAttack(A,1)
	else
		if(W)
			W.afterattack(A,src,0,params)
		else
			RangedAttack(A,params)

//Is the atom obscured by a PREVENT_CLICK_UNDER_1 object above it
/atom/proc/IsObscured()
	if(!isturf(loc)) //This only makes sense for things directly on turfs for now
		return FALSE
	var/turf/T = get_turf_pixel(src)
	if(!T)
		return FALSE
	for(var/atom/movable/AM in T)
		if(AM.flags_1 & PREVENT_CLICK_UNDER_1 && AM.density && AM.layer > layer)
			return TRUE
	return FALSE

/turf/IsObscured()
	for(var/atom/movable/AM in src)
		if(AM.flags_1 & PREVENT_CLICK_UNDER_1 && AM.density)
			return TRUE
	return FALSE

/atom/movable/proc/CanReach(atom/ultimate_target, obj/item/tool, view_only = FALSE)
	// A backwards depth-limited breadth-first-search to see if the target is
	// logically "in" anything adjacent to us.
	var/list/direct_access = DirectAccess()
	var/depth = 1 + (view_only ? STORAGE_VIEW_DEPTH : INVENTORY_DEPTH)

	var/list/closed = list()
	var/list/checking = list(ultimate_target)
	while (checking.len && depth > 0)
		var/list/next = list()
		--depth

		for(var/atom/target in checking)  // will filter out nulls
			if(closed[target] || isarea(target))  // avoid infinity situations
				continue
			closed[target] = TRUE
			if(isturf(target) || isturf(target.loc) || (target in direct_access)) //Directly accessible atoms
				if(Adjacent(target) || (tool && CheckToolReach(src, target, tool.reach))) //Adjacent or reaching attacks
					return TRUE

			if (!target.loc)
				continue

			if(!(SEND_SIGNAL(target.loc, COMSIG_ATOM_CANREACH, next) & COMPONENT_BLOCK_REACH))
				next += target.loc

		checking = next
	return FALSE

/atom/movable/proc/DirectAccess()
	return list(src, loc)

/mob/DirectAccess(atom/target)
	return ..() + contents

/mob/living/DirectAccess(atom/target)
	return ..() + GetAllContents()

/atom/proc/AllowClick()
	return FALSE

/turf/AllowClick()
	return TRUE

/proc/CheckToolReach(atom/movable/here, atom/movable/there, reach)
	if(!here || !there)
		return
	switch(reach)
		if(0)
			return FALSE
		if(1)
			return FALSE //here.Adjacent(there)
		if(2 to INFINITY)
			var/obj/dummy = new(get_turf(here))
			dummy.pass_flags |= PASSTABLE
			dummy.invisibility = INVISIBILITY_ABSTRACT
			for(var/i in 1 to reach) //Limit it to that many tries
				var/turf/T = get_step(dummy, get_dir(dummy, there))
				if(dummy.CanReach(there))
					qdel(dummy)
					return TRUE
				if(!dummy.Move(T)) //we're blocked!
					qdel(dummy)
					return
			qdel(dummy)

// Default behavior: ignore double clicks (the second click that makes the doubleclick call already calls for a normal click)
/mob/proc/DblClickOn(atom/A, params)
	return


/*
	Translates into attack_hand, etc.

	Note: proximity_flag here is used to distinguish between normal usage (flag=1),
	and usage when clicking on things telekinetically (flag=0).  This proc will
	not be called at ranged except with telekinesis.

	proximity_flag is not currently passed to attack_hand, and is instead used
	in human click code to allow glove touches only at melee range.
*/
/mob/proc/UnarmedAttack(atom/A, proximity_flag)
	if(ismob(A))
		changeNext_move(CLICK_CD_MELEE)
	return

/*
	Ranged unarmed attack:

	This currently is just a default for all mobs, involving
	laser eyes and telekinesis.  You could easily add exceptions
	for things like ranged glove touches, spitting alien acid/neurotoxin,
	animals lunging, etc.
*/
/mob/proc/RangedAttack(atom/A, params)
	SEND_SIGNAL(src, COMSIG_MOB_ATTACK_RANGED, A, params)
/*
	Restrained ClickOn

	Used when you are handcuffed and click things.
	Not currently used by anything but could easily be.
*/
/mob/proc/RestrainedClickOn(atom/A)
	return

/*
	Middle click
	Only used for swapping hands
*/
/mob/proc/MiddleClickOn(atom/A)
	return

/mob/living/carbon/MiddleClickOn(atom/A)
	if(!stat && mind && iscarbon(A) && A != src)
		var/datum/antagonist/changeling/C = mind.has_antag_datum(/datum/antagonist/changeling)
		if(C && C.chosen_sting)
			C.chosen_sting.try_to_sting(src,A)
			next_click = world.time + 5
			return
	swap_hand()

/mob/living/simple_animal/drone/MiddleClickOn(atom/A)
	swap_hand()

// In case of use break glass
/*
/atom/proc/MiddleClick(mob/M as mob)
	return
*/

/*
	Shift click
	For most mobs, examine.
	This is overridden in ai.dm
*/
/mob/proc/ShiftClickOn(atom/A)
	A.ShiftClick(src)
	return
/atom/proc/ShiftClick(mob/user)
	SEND_SIGNAL(src, COMSIG_CLICK_SHIFT, user)
	if(user.client && user.client.eye == user || user.client.eye == user.loc)
		user.examinate(src)
	return

/*
	Ctrl click
	For most objects, pull
*/

/mob/proc/CtrlClickOn(atom/A)
	A.CtrlClick(src)
	return

/atom/proc/CtrlClick(mob/user)
	SEND_SIGNAL(src, COMSIG_CLICK_CTRL, user)
	var/mob/living/ML = user
	if(istype(ML))
		ML.pulled(src)

/mob/living/carbon/human/CtrlClick(mob/user)
	if(ishuman(user) && Adjacent(user) && !user.incapacitated())
		if(world.time < user.next_move)
			return FALSE
		var/mob/living/carbon/human/H = user
		H.dna.species.grab(H, src, H.mind.martial_art)
		H.changeNext_move(CLICK_CD_MELEE)
	else
		..()
/*
	Alt click
	Unused except for AI
*/
/mob/proc/AltClickOn(atom/A)
	var/result = SEND_SIGNAL(src, COMSIG_ALT_CLICK_ON, A) //yogs start - has to be like this, otherwise stuff breaks
	if(!result)
		A.AltClick(src)
	return //yogs end

/mob/living/carbon/AltClickOn(atom/A)
	if(!stat && mind && iscarbon(A) && A != src)
		var/datum/antagonist/changeling/C = mind.has_antag_datum(/datum/antagonist/changeling)
		if(C && C.chosen_sting)
			C.chosen_sting.try_to_sting(src,A)
			next_click = world.time + 5
			return
	..()

/atom/proc/AltClick(mob/user)
	SEND_SIGNAL(src, COMSIG_CLICK_ALT, user)
	var/turf/T = get_turf(src)
	if(T && user.TurfAdjacent(T))
		if(user.listed_turf == T)
			user.listed_turf = null
		else
			user.listed_turf = T
			user.client.statpanel = T.name

/mob/proc/TurfAdjacent(turf/T)
	return T.Adjacent(src)

/*
	Control+Shift click
	Unused except for AI
*/
/mob/proc/CtrlShiftClickOn(atom/A)
	A.CtrlShiftClick(src)
	return

/mob/proc/ShiftMiddleClickOn(atom/A)
	src.pointed(A)
	return

/atom/proc/CtrlShiftClick(mob/user)
	SEND_SIGNAL(src, COMSIG_CLICK_CTRL_SHIFT)
	return

/*
	Misc helpers

	Laser Eyes: as the name implies, handles this since nothing else does currently
	face_atom: turns the mob towards what you clicked on
*/
/mob/proc/LaserEyes(atom/A, params)
	return

/mob/living/LaserEyes(atom/A, params)
	changeNext_move(CLICK_CD_RANGE)

	var/obj/item/projectile/beam/LE = new /obj/item/projectile/beam( loc )
	LE.icon = 'icons/effects/genetics.dmi'
	LE.icon_state = "eyelasers"
	playsound(usr.loc, 'sound/weapons/taser2.ogg', 75, 1)

	LE.firer = src
	LE.def_zone = get_organ_target()
	LE.preparePixelProjectile(A, src, params)
	LE.fire()

// Simple helper to face what you clicked on, in case it should be needed in more than one place
/mob/proc/face_atom(atom/A)
	if( buckled || stat != CONSCIOUS || !A || !x || !y || !A.x || !A.y )
		return
	var/dx = A.x - x
	var/dy = A.y - y
	if(!dx && !dy) // Wall items are graphically shifted but on the floor
		if(A.pixel_y > 16)
			setDir(NORTH)
		else if(A.pixel_y < -16)
			setDir(SOUTH)
		else if(A.pixel_x > 16)
			setDir(EAST)
		else if(A.pixel_x < -16)
			setDir(WEST)
		return

	if(abs(dx) < abs(dy))
		if(dy > 0)
			setDir(NORTH)
		else
			setDir(SOUTH)
	else
		if(dx > 0)
			setDir(EAST)
		else
			setDir(WEST)

//debug
/obj/screen/proc/scale_to(x1,y1)
	if(!y1)
		y1 = x1
	var/matrix/M = new
	M.Scale(x1,y1)
	transform = M

/obj/screen/click_catcher
	icon = 'icons/mob/screen_gen.dmi'
	icon_state = "catcher"
	plane = CLICKCATCHER_PLANE
	mouse_opacity = MOUSE_OPACITY_OPAQUE
	screen_loc = "CENTER"

#define MAX_SAFE_BYOND_ICON_SCALE_TILES (MAX_SAFE_BYOND_ICON_SCALE_PX / world.icon_size)
#define MAX_SAFE_BYOND_ICON_SCALE_PX (33 * 32)			//Not using world.icon_size on purpose.

/obj/screen/click_catcher/proc/UpdateGreed(view_size_x = 15, view_size_y = 15)
	var/icon/newicon = icon('icons/mob/screen_gen.dmi', "catcher")
	var/ox = min(MAX_SAFE_BYOND_ICON_SCALE_TILES, view_size_x)
	var/oy = min(MAX_SAFE_BYOND_ICON_SCALE_TILES, view_size_y)
	var/px = view_size_x * world.icon_size
	var/py = view_size_y * world.icon_size
	var/sx = min(MAX_SAFE_BYOND_ICON_SCALE_PX, px)
	var/sy = min(MAX_SAFE_BYOND_ICON_SCALE_PX, py)
	newicon.Scale(sx, sy)
	icon = newicon
	screen_loc = "CENTER-[(ox-1)*0.5],CENTER-[(oy-1)*0.5]"
	var/matrix/M = new
	M.Scale(px/sx, py/sy)
	transform = M

/obj/screen/click_catcher/Click(location, control, params)
	var/list/modifiers = params2list(params)
	if(modifiers["middle"] && iscarbon(usr))
		var/mob/living/carbon/C = usr
		C.swap_hand()
	else
		var/turf/T = params2turf(modifiers["screen-loc"], get_turf(usr.client ? usr.client.eye : usr), usr.client)
		params += "&catcher=1"
		if(T)
			T.Click(location, control, params)
	. = 1

/* MouseWheelOn */

/mob/proc/MouseWheelOn(atom/A, delta_x, delta_y, params)
	return

/mob/dead/observer/MouseWheelOn(atom/A, delta_x, delta_y, params)
	var/list/modifier = params2list(params)
	if(modifier["shift"])
		var/view = 0
		if(delta_y > 0)
			view = -1
		else
			view = 1
		add_view_range(view)

/mob/proc/check_click_intercept(params,A)
	//Client level intercept
	if(client && client.click_intercept)
		if(call(client.click_intercept, "InterceptClickOn")(src, params, A))
			return TRUE

	//Mob level intercept
	if(click_intercept)
		if(call(click_intercept, "InterceptClickOn")(src, params, A))
			return TRUE

	return FALSE