/**
 * A simple form to set actor hit dice amounts
 * @implements {DocumentSheet}
 */
export default class ActorHitDiceConfig extends DocumentSheet {
    /** @override */
    static get defaultOptions() {
        return foundry.utils.mergeObject(super.defaultOptions, {
            classes: ["sw5e", "hd-config", "dialog"],
            template: "systems/sw5e/templates/apps/hit-dice-config.html",
            width: 360,
            height: "auto"
        });
    }

    /* -------------------------------------------- */

    /** @override */
    get title() {
        return `${game.i18n.localize("SW5E.HitDiceConfig")}: ${this.object.name}`;
    }

    /* -------------------------------------------- */

    /** @override */
    getData(options) {
        return {
            classes: this.object.items
                .reduce((classes, item) => {
                    if (item.data.type === "class") {
                        // Add the appropriate data only if this item is a "class"
                        classes.push({
                            classItemId: item.data._id,
                            name: item.data.name,
                            diceDenom: item.data.data.hitDice,
                            currentHitDice: item.data.data.levels - item.data.data.hitDiceUsed,
                            maxHitDice: item.data.data.levels,
                            canRoll: item.data.data.levels - item.data.data.hitDiceUsed > 0
                        });
                    }
                    return classes;
                }, [])
                .sort((a, b) => parseInt(b.diceDenom.slice(1)) - parseInt(a.diceDenom.slice(1)))
        };
    }

    /* -------------------------------------------- */

    /** @override */
    activateListeners(html) {
        super.activateListeners(html);

        // Hook up -/+ buttons to adjust the current value in the form
        html.find("button.increment,button.decrement").click((event) => {
            const button = event.currentTarget;
            const current = button.parentElement.querySelector(".current");
            const max = button.parentElement.querySelector(".max");
            const direction = button.classList.contains("increment") ? 1 : -1;
            current.value = Math.clamped(parseInt(current.value) + direction, 0, parseInt(max.value));
        });

        html.find("button.roll-hd").click(this._onRollHitDie.bind(this));
    }

    /* -------------------------------------------- */

    /** @override */
    async _updateObject(event, formData) {
        const actorItems = this.object.items;
        const classUpdates = Object.entries(formData).map(([id, hd]) => ({
            "_id": id,
            "data.hitDiceUsed": actorItems.get(id).data.data.levels - hd
        }));
        return this.object.updateEmbeddedDocuments("Item", classUpdates);
    }

    /* -------------------------------------------- */

    /**
     * Rolls the hit die corresponding with the class row containing the event's target button.
     * @param {MouseEvent} event
     * @private
     */
    async _onRollHitDie(event) {
        event.preventDefault();
        const button = event.currentTarget;
        await this.object.rollHitDie(button.dataset.hdDenom);

        // Re-render dialog to reflect changed hit dice quantities
        this.render();
    }
}