daggerheart/module/data/chat-message/adversaryRoll.mjs

const fields = foundry.data.fields;

const targetsField = () =>
    new fields.ArrayField(
        new fields.SchemaField({
            id: new fields.StringField({}),
            actorId: new fields.StringField({}),
            name: new fields.StringField({}),
            img: new fields.StringField({}),
            difficulty: new fields.NumberField({ integer: true, nullable: true }),
            evasion: new fields.NumberField({ integer: true }),
            hit: new fields.BooleanField({ initial: false }),
            saved: new fields.SchemaField({
                result: new fields.NumberField(),
                success: new fields.BooleanField({ nullable: true, initial: null })
            })
        })
    );

export default class DHActorRoll extends foundry.abstract.TypeDataModel {
    targetHook = null;

    static defineSchema() {
        return {
            title: new fields.StringField(),
            roll: new fields.ObjectField(),
            targets: targetsField(),
            oldTargets: targetsField(),
            targetSelection: new fields.BooleanField({ initial: false }),
            hasRoll: new fields.BooleanField({ initial: false }),
            hasDamage: new fields.BooleanField({ initial: false }),
            hasHealing: new fields.BooleanField({ initial: false }),
            hasEffect: new fields.BooleanField({ initial: false }),
            hasSave: new fields.BooleanField({ initial: false }),
            hasTarget: new fields.BooleanField({ initial: false }),
            isCritical: new fields.BooleanField({ initial: false }),
            onSave: new fields.StringField(),
            source: new fields.SchemaField({
                actor: new fields.StringField(),
                item: new fields.StringField(),
                action: new fields.StringField()
            }),
            damage: new fields.ObjectField(),
            costs: new fields.ArrayField(new fields.ObjectField()),
            successConsumed: new fields.BooleanField({ initial: false })
        };
    }

    get actionActor() {
        if (!this.source.actor) return null;
        return fromUuidSync(this.source.actor);
    }

    get actionItem() {
        const actionActor = this.actionActor;
        if (!actionActor || !this.source.item) return null;
        return actionActor.items.get(this.source.item);
    }

    get action() {
        const actionItem = this.actionItem;
        if (!actionItem || !this.source.action) return null;
        return actionItem.system.actionsList?.find(a => a.id === this.source.action);
    }

    get messageTemplate() {
        return 'systems/daggerheart/templates/ui/chat/roll.hbs';
    }

    get targetMode() {
        return this.targetSelection;
    }

    set targetMode(mode) {
        this.targetSelection = mode;
        this.updateTargets();
        this.registerTargetHook();
        this.parent.update({
            system: {
                targetSelection: this.targetSelection,
                oldTargets: this.oldTargets
            }
        });
    }

    get hitTargets() {
        return this.currentTargets.filter(t => t.hit || !this.hasRoll || !this.targetSelection);
    }

    async updateTargets() {
        this.currentTargets = this.getTargetList();
        if (!this.targetSelection) {
            this.currentTargets.forEach(ct => {
                if (this.targets.find(t => t.actorId === ct.actorId)) return;
                const indexTarget = this.oldTargets.findIndex(ot => ot.actorId === ct.actorId);
                if (indexTarget === -1) this.oldTargets.push(ct);
            });
            if (this.hasSave) this.setPendingSaves();
            if (this.currentTargets.length) {
                if (!this.parent._id) return;
                const updates = await this.parent.update({
                    system: {
                        oldTargets: this.oldTargets
                    }
                });
                if (!updates && ui.chat.collection.get(this.parent.id)) ui.chat.updateMessage(this.parent);
            }
        }
    }

    registerTargetHook() {
        if (this.targetSelection && this.targetHook !== null) {
            Hooks.off('targetToken', this.targetHook);
            this.targetHook = null;
        } else if (!this.targetSelection && this.targetHook === null) {
            this.targetHook = Hooks.on('targetToken', foundry.utils.debounce(this.updateTargets.bind(this), 50));
        }
    }

    prepareDerivedData() {
        if (this.hasTarget) {
            this.hasHitTarget = this.targets.filter(t => t.hit === true).length > 0;
            this.updateTargets();
            this.registerTargetHook();
            if (this.targetSelection === true) {
                this.targetShort = this.targets.reduce(
                    (a, c) => {
                        if (c.hit) a.hit += 1;
                        else a.miss += 1;
                        return a;
                    },
                    { hit: 0, miss: 0 }
                );
            }
            if (this.hasSave) this.setPendingSaves();
        }

        this.canViewSecret = this.parent.speakerActor?.testUserPermission(game.user, 'OBSERVER');
    }

    getTargetList() {
        return this.targetSelection !== true
            ? Array.from(game.user.targets).map(t => {
                  const target = game.system.api.fields.ActionFields.TargetField.formatTarget(t),
                      oldTarget =
                          this.targets.find(ot => ot.actorId === target.actorId) ??
                          this.oldTargets.find(ot => ot.actorId === target.actorId);
                  if (oldTarget) return oldTarget;
                  return target;
              })
            : this.targets;
    }

    setPendingSaves() {
        this.pendingSaves = this.targetSelection
            ? this.targets.filter(target => target.hit && target.saved.success === null).length > 0
            : this.currentTargets.filter(target => target.saved.success === null).length > 0;
    }
}