isleward/src/server/config/spells/spellAura.js

module.exports = {
	type: 'aura',

	cdMax: 0,
	manaCost: 0,

	duration: 10,

	aura: true,
	active: false,

	effects: {},

	cast: function (action) {
		this.active = !this.active;

		return true;
	},

	update: function () {
		let active = this.active;

		if (active)
			this.updateActive();
		else
			this.updateInactive();
	},

	unlearn: function () {
		this.updateInactive();
	},

	onAfterSimplify: function (values) {
		delete values.effects;
	},

	die: function () {
		if (this.active)
			this.cast();
	},

	updateActive: function () {
		let o = this.obj;
		let amount = 0;
		if (this.name === 'Innervation')
			amount = ~~((o.stats.values.hpMax / 100) * this.values.regenPercentage);
		else
			amount = this.values.regenPercentage || this.values.chance;

		let party = (o.social || {}).party || [];
		let members = [o.serverId, ...party];
		let effects = this.effects;
		let objects = o.instance.objects.objects;

		let range = this.auraRange;

		members.forEach(m => {
			let effect = effects[m];

			let obj = objects.find(f => (f.serverId === m));
			if (!obj) {
				if (effect)
					delete effects[m];

				return;
			}

			let distance = Math.max(Math.abs(o.x - obj.x), Math.abs(o.y - obj.y));
			if (distance > range) {
				if (effect) {
					delete effects[m];
					obj.effects.removeEffect(effect.id);
				}

				return;
			}

			if (effect)
				return;

			if (!obj.effects)
				return;

			effects[obj.serverId] = obj.effects.addEffect({
				type: this.effect,
				amount: amount,
				caster: this.obj,
				ttl: -1
			});
		});

		//Remove effects from players who are no longer in the party
		Object.entries(effects).forEach(([serverId, effect]) => {
			if (!members.find(m => ~~m === ~~serverId)) {
				delete effects[serverId];
				const obj = objects.find(f => ~~f.serverId === ~~serverId);
				if (obj)
					obj.effects.removeEffect(effect.id);
			}
		});
	},

	updateInactive: function () {
		let o = this.obj;
		let effects = this.effects;
		let objects = o.instance.objects.objects;

		Object.keys(effects).forEach(function (m) {
			let effect = effects[m];
			if (!effect)
				return;

			let obj = objects.find(f => (f.serverId === ~~m));
			if (!obj) {
				delete effects[m];
				return;
			}

			obj.effects.removeEffect(effect.id);
			delete effects[m];
		}, this);
	}
};