daggerheart/module/applications/downtime.mjs

const {HandlebarsApplicationMixin, ApplicationV2} = foundry.applications.api;

export default class DhpDowntime extends HandlebarsApplicationMixin(ApplicationV2) {
    constructor(actor, shortrest){
        super({});

        this.actor = actor;
        this.selectedActivity = null;
        this.shortrest = shortrest;

        this.customActivity = SYSTEM.GENERAL.downtime.custom;
    }

    get title(){
        return `${this.actor.name} - ${this.shortrest ? 'Short Rest': 'Long Rest'}`; 
    }

    static DEFAULT_OPTIONS = {
        tag: 'form',
        classes: ["daggerheart", "views", "downtime"],
        position: { width: 800, height: 'auto' },
        actions: {
            selectActivity: this.selectActivity,
            takeDowntime: this.takeDowntime,
        },
        form: { handler: this.updateData, submitOnChange: true }
    };
      
    static PARTS = {
        application: {
            id: "downtime",
            template: "systems/daggerheart/templates/views/downtime.hbs"
        }
    }

    async _prepareContext(_options) {
        const context = await super._prepareContext(_options);
        context.selectedActivity = this.selectedActivity;
        context.options = this.shortrest ? SYSTEM.GENERAL.downtime.shortRest : SYSTEM.GENERAL.downtime.longRest;
        context.customActivity = this.customActivity;

        context.disabledDowntime = !this.selectedActivity || (this.selectedActivity.id === this.customActivity.id && (!this.customActivity.name || !this.customActivity.description));

        return context;
    }


    static selectActivity(_, button){
        const activity = button.dataset.activity;
        this.selectedActivity = activity === this.customActivity.id ? this.customActivity : this.shortrest ? SYSTEM.GENERAL.downtime.shortRest[activity] : SYSTEM.GENERAL.downtime.longRest[activity];

        this.render();
    }

    static async takeDowntime(){
        const refreshedFeatures = this.shortrest ? this.actor.system.refreshableFeatures.shortRest : [...this.actor.system.refreshableFeatures.shortRest, ...this.actor.system.refreshableFeatures.longRest];
        for(var feature of refreshedFeatures){
            await feature.system.refresh();
        }

        const cls = getDocumentClass("ChatMessage");
        const msg = new cls({
            user: game.user.id,
            content: await renderTemplate("systems/daggerheart/templates/chat/downtime.hbs", { 
                player: game.user.character.name, 
                title: game.i18n.localize(this.selectedActivity.name), 
                img: this.selectedActivity.img,
                description: game.i18n.localize(this.selectedActivity.description),
                refreshedFeatures: refreshedFeatures,
            }),
        });
    
        cls.create(msg.toObject());

        this.close();
    }

    static async updateData(event, element, formData){
        this.customActivity = foundry.utils.mergeObject(this.customActivity, formData.object);
        this.render();
    }
}