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Bubberstation/code/datums/components/shielded.dm
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necromanceranne ac6c47f601 Several file changes just to make high frequency blade null rods block mechs, mech melee blocking finally implemented (#94089) 
## About The Pull Request

High frequency blades, both null rod variant and admeme variant, can
block mech melee attacks. For the former, that is the only thing it can
block. Great if you're fighting a lot of mechs as a chaplain I guess.
And you're also really committed to the bit.

Weapons that were vibro subtypes are now claymore subtypes. The only
difference here is that they now have 30% block instead of 35% AP.

Null rod high frequency blades are now two-handed. This mostly
determines force changes (10 unwielded, 18 wielded), and mech attack
block chances.

Mech melee attacks respect block...assuming the blocking source can even
block the attack in the first place. Currently, the few sources that can
block/avoid mech attacks are;
- high frequency blades
- energy katanas
- Those staff nullrods (its a holy force field, iunno)
- wizard modsuit shield (and it will eat literally every single charge
it has to do that)
- Sleeping Carp evasion (and only at half the possible chance)
- CQC defense mode (themed as dodging the attack, and also halved)
- probably something I overlooked when I implemented OVERWHELMING_ATTACK
originally and have overlooked here as well.
 
Just think 'could this help avoid being hit by a road roller being
dropped on you' and go with your gut as to whether or not it is
appropriate if you spot something in the wild that seemingly can block a
mech.

## Why It's Good For The Game

> High Frequency Blade

I wanted to elevate the meme and that is as deep as this goes. Also I
wanted to make this two-handed, much like the true version.
The only thing it is lacking is the cool attack functionality, but I'll
be damned if I can get that to work in a sensible fashion for a crew
weapon...

> Vibro subtype

A lot less of these than I thought. And most of them seemed more
appropriate as claymore types anyway.

> Mech Block

I seeded this previously by making mech clamps respect block. I've now
come back to fully implement it in order to facilitate MGR memes.

For the most part, mechs should still enjoy being largely unblocked by
most sources, even from things like operative suit shields, and
certainly not from actual shields (which I've stripped the ability to
block the attack from entirely) and melee weapons.

The sources that can block them do so poorly. Or, in the case of the
high frequency blade, very well and that's pretty much the only thing it
IS good at blocking.

## Changelog
🆑
balance: High frequency blades (both null rod and admin versions) are
able to block melee attacks from mechs.
balance: High frequency blade null rods are now two-handed weapons.
balance: Mech melee attacks can be blocked or avoided by a few rare
sources.
/🆑
2025-12-02 01:13:58 -05:00

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/**
* The shielded component causes the parent item to nullify a certain number of attacks against the wearer, see: shielded vests.
*/
/datum/component/shielded
dupe_mode = COMPONENT_DUPE_UNIQUE
/// The person currently wearing us
var/mob/living/wearer
/// How many charges we can have max, and how many we start with
var/max_charges
/// How many charges we currently have
var/current_charges
/// How long we have to avoid being hit to replenish charges. If set to 0, we never recharge lost charges
var/recharge_start_delay = 20 SECONDS
/// Once we go unhit long enough to recharge, we replenish charges this often. The floor is effectively 1 second, AKA how often SSdcs processes
var/charge_increment_delay = 1 SECONDS
/// How many charges we recover on each charge increment
var/charge_recovery = 1
/// What .dmi we're pulling the shield icon from
var/shield_icon_file = 'icons/effects/effects.dmi'
/// What icon is used when someone has a functional shield up
var/shield_icon = "shield-old"
/// Do we still shield if we're being held in-hand? If FALSE, it needs to be equipped to a slot to work
var/shield_inhand = FALSE
/// Should the shield lose charges equal to the damage dealt by a hit?
var/lose_multiple_charges = FALSE
/// Should the shield's alpha change to show its remaining charge
var/show_charge_as_alpha = FALSE
/// The item we use for recharging
var/recharge_path
/// The item can block OVERWHELMING_ATTACK, which is mostly used by mech melee attacks.
var/can_block_overwhelming = FALSE
/// The cooldown tracking when we were last hit
COOLDOWN_DECLARE(recently_hit_cd)
/// The cooldown tracking when we last replenished a charge
COOLDOWN_DECLARE(charge_add_cd)
/// A callback for the sparks/message that play when a charge is used, see [/datum/component/shielded/proc/default_run_hit_callback]
var/datum/callback/on_hit_effects
/datum/component/shielded/Initialize(max_charges = 3, recharge_start_delay = 20 SECONDS, charge_increment_delay = 1 SECONDS, charge_recovery = 1, lose_multiple_charges = FALSE, show_charge_as_alpha = FALSE, recharge_path = null, can_block_overwhelming = FALSE, starting_charges = null, shield_icon_file = 'icons/effects/effects.dmi', shield_icon = "shield-old", shield_inhand = FALSE, run_hit_callback)
if(!isitem(parent) || max_charges <= 0)
return COMPONENT_INCOMPATIBLE
src.max_charges = max_charges
src.recharge_start_delay = recharge_start_delay
src.charge_increment_delay = charge_increment_delay
src.charge_recovery = charge_recovery
src.lose_multiple_charges = lose_multiple_charges
src.show_charge_as_alpha = show_charge_as_alpha
src.recharge_path = recharge_path
src.can_block_overwhelming = can_block_overwhelming
src.shield_icon_file = shield_icon_file
src.shield_icon = shield_icon
src.shield_inhand = shield_inhand
src.on_hit_effects = run_hit_callback || CALLBACK(src, PROC_REF(default_run_hit_callback))
if(isnull(starting_charges))
current_charges = max_charges
else
current_charges = starting_charges
if(recharge_start_delay)
START_PROCESSING(SSdcs, src)
/datum/component/shielded/Destroy(force)
if(wearer)
shield_icon = "broken"
UnregisterSignal(wearer, COMSIG_ATOM_UPDATE_OVERLAYS)
wearer.update_appearance(UPDATE_ICON)
wearer = null
on_hit_effects = null
return ..()
/datum/component/shielded/RegisterWithParent()
RegisterSignal(parent, COMSIG_ITEM_EQUIPPED, PROC_REF(on_equipped))
RegisterSignal(parent, COMSIG_ITEM_DROPPED, PROC_REF(lost_wearer))
RegisterSignal(parent, COMSIG_ITEM_HIT_REACT, PROC_REF(on_hit_react))
var/atom/shield = parent
if(ismob(shield.loc))
var/mob/holder = shield.loc
if(holder.is_holding(parent) && !shield_inhand)
return
set_wearer(holder)
/datum/component/shielded/UnregisterFromParent()
UnregisterSignal(parent, list(COMSIG_ITEM_EQUIPPED, COMSIG_ITEM_DROPPED, COMSIG_ITEM_HIT_REACT))
var/atom/shield = parent
if(shield.loc == wearer)
lost_wearer(src, wearer)
// Handle recharging, if we want to
/datum/component/shielded/process(seconds_per_tick)
if(current_charges >= max_charges)
STOP_PROCESSING(SSdcs, src)
return
if(!COOLDOWN_FINISHED(src, recently_hit_cd))
return
if(!COOLDOWN_FINISHED(src, charge_add_cd))
return
var/obj/item/item_parent = parent
COOLDOWN_START(src, charge_add_cd, charge_increment_delay)
adjust_charge(charge_recovery) // set the number of charges to current + recovery per increment, clamped from zero to max_charges
playsound(item_parent, 'sound/effects/magic/charge.ogg', 50, TRUE)
if(current_charges == max_charges)
playsound(item_parent, 'sound/machines/ding.ogg', 50, TRUE)
/datum/component/shielded/proc/adjust_charge(change)
current_charges = clamp(current_charges + change, 0, max_charges)
if(wearer)
wearer.update_appearance(UPDATE_ICON)
/// Check if we've been equipped to a valid slot to shield
/datum/component/shielded/proc/on_equipped(datum/source, mob/user, slot)
SIGNAL_HANDLER
if(user.is_holding(parent) && !shield_inhand)
lost_wearer(source, user)
return
set_wearer(user)
/// Either we've been dropped or our wearer has been QDEL'd. Either way, they're no longer our problem
/datum/component/shielded/proc/lost_wearer(datum/source, mob/user)
SIGNAL_HANDLER
if(wearer)
UnregisterSignal(wearer, list(COMSIG_ATOM_UPDATE_OVERLAYS, COMSIG_QDELETING))
wearer.update_appearance(UPDATE_ICON)
wearer = null
/datum/component/shielded/proc/set_wearer(mob/user)
if(wearer == user)
return
if(!isnull(wearer))
CRASH("[type] called set_wearer with [user] but [wearer] was already the wearer!")
wearer = user
RegisterSignal(wearer, COMSIG_ATOM_UPDATE_OVERLAYS, PROC_REF(on_update_overlays))
RegisterSignal(wearer, COMSIG_QDELETING, PROC_REF(lost_wearer))
if(current_charges)
wearer.update_appearance(UPDATE_ICON)
/// Used to draw the shield overlay on the wearer
/datum/component/shielded/proc/on_update_overlays(atom/parent_atom, list/overlays)
SIGNAL_HANDLER
var/mutable_appearance/shield_appearance = mutable_appearance(shield_icon_file, (current_charges > 0 ? shield_icon : "broken"), MOB_SHIELD_LAYER)
if(show_charge_as_alpha)
shield_appearance.alpha = (current_charges/max_charges)*255
overlays += shield_appearance
/**
* This proc fires when we're hit, and is responsible for checking if we're charged, then deducting one + returning that we're blocking if so.
* It then runs the callback in [/datum/component/shielded/var/on_hit_effects] which handles the messages/sparks (so the visuals)
*/
/datum/component/shielded/proc/on_hit_react(datum/source, mob/living/carbon/human/owner, atom/movable/hitby, attack_text, final_block_chance, damage, attack_type, damage_type)
SIGNAL_HANDLER
COOLDOWN_START(src, recently_hit_cd, recharge_start_delay)
//No wearer? No block.
if(isnull(wearer))
return
//if our wearer isn't the owner of the block, don't block
if(owner != wearer)
return
if(current_charges <= 0)
return
// if our shield is unable to block OVERWHELMING_ATTACK type attacks, we just let it pass.
if(attack_type == OVERWHELMING_ATTACK && !can_block_overwhelming)
return
. = COMPONENT_HIT_REACTION_BLOCK
var/charge_loss = 1 // how many charges do we lose
if(lose_multiple_charges) // if the shield has health like damage we'll lose charges equal to the damage of the hit
charge_loss = damage
else if(damage < 3)
charge_loss = 0
else if(attack_type == OVERWHELMING_ATTACK && !lose_multiple_charges) // Always expend all charges when blocking an overwhelming attack unless we're using our shield like health.
charge_loss = max_charges
adjust_charge(-charge_loss)
INVOKE_ASYNC(src, PROC_REF(actually_run_hit_callback), owner, attack_text, current_charges)
if(!recharge_start_delay) // if recharge_start_delay is 0, we don't recharge
return
START_PROCESSING(SSdcs, src) // if we DO recharge, start processing so we can do that
/// The wrapper to invoke the on_hit callback, so we don't have to worry about blocking in the signal handler
/datum/component/shielded/proc/actually_run_hit_callback(mob/living/owner, attack_text, current_charges)
on_hit_effects.Invoke(owner, attack_text, current_charges)
/// Default on_hit proc, since cult robes are stupid and have different descriptions/sparks
/datum/component/shielded/proc/default_run_hit_callback(mob/living/owner, attack_text, current_charges)
do_sparks(2, TRUE, owner)
owner.visible_message(span_danger("[owner]'s shields deflect [attack_text] in a shower of sparks!"))
if(current_charges <= 0)
owner.visible_message(span_warning("[owner]'s shield overloads!"))
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