import { VermineExperience } from "../experience.mjs";

const { HandlebarsApplicationMixin } = foundry.applications.api;

/**
 * Dialogue d'achat d'une Adaptation/Mutation avec les Dés d'Évolution
 * accumulés. Vérifie le coût (niveau 1-4), la limite du Mode de jeu et les
 * restrictions sur les Mutations ; en cas de succès, crée l'item et consomme
 * un nombre de Dés d'Évolution égal au niveau choisi.
 */
export default class BuyEvolutionDialog extends HandlebarsApplicationMixin(foundry.applications.api.ApplicationV2) {

  #actor;

  static DEFAULT_OPTIONS = {
    classes: ["vermine-roll", "buy-evolution"],
    tag: "form",
    window: {
      icon: "fas fa-cart-shopping",
      resizable: false
    },
    position: {
      width: 480,
      height: 460
    },
    actions: {
      buy: BuyEvolutionDialog.#onBuy,
      cancel: BuyEvolutionDialog.#onCancel
    }
  };

  static PARTS = {
    main: { template: "systems/vermine2047/templates/dialogs/buy-evolution-dialog.hbs", scrollable: [""] }
  };

  static async create({ actorId }) {
    const actor = await game.actors.get(actorId);
    if (!actor) {
      ui.notifications.warn(game.i18n.localize("VERMINE.error_no_actor_selected"));
      return null;
    }
    return new BuyEvolutionDialog({ actor });
  }

  constructor(options = {}) {
    super(options);
    this.#actor = options.actor;
  }

  get title() {
    return game.i18n.localize("VERMINE.buy_evolution");
  }

  async _prepareContext() {
    const actor = this.#actor;
    const mode = VermineExperience.gameMode();
    const modeLabels = {
      1: game.i18n.localize("VERMINE.mode_survie"),
      2: game.i18n.localize("VERMINE.mode_cauchemar"),
      3: game.i18n.localize("VERMINE.mode_apocalypse")
    };
    const levels = [];
    for (let value = 1; value <= 4; value++) {
      levels.push({ value });
    }
    return {
      evolutionDice: actor.system?.experience?.evolution || 0,
      defaultName: game.i18n.localize("ITEMS.new_evolution"),
      levels,
      totalLevels: VermineExperience.evolutionTotalLevels(actor),
      modeMax: VermineExperience.evolutionMaxForMode(mode),
      modeLabel: modeLabels[mode] || ""
    };
  }

  async _onRender() {
    this.element.querySelectorAll("[data-roll]").forEach(inp => inp.addEventListener("change", () => this.#updateUI()));
    this.#updateUI();
  }

  /** Met à jour le total des niveaux « après achat » selon le niveau sélectionné. */
  #updateUI() {
    const cost = parseInt(this.element.querySelector("#evolution-level")?.value, 10) || 0;
    const el = this.element.querySelector("#evolution-total-value");
    if (el) el.textContent = `${VermineExperience.evolutionTotalLevels(this.#actor) + cost}D`;
  }

  static async #onCancel(event, target) {
    this.close();
  }

  static async #onBuy(event, target) {
    const actor = this.#actor;
    const name = this.element.querySelector("#evolution-name")?.value?.trim() || "";
    const cost = parseInt(this.element.querySelector("#evolution-level")?.value, 10) || 0;
    const mutation = this.element.querySelector("#evolution-mutation")?.checked || false;

    if (!name) {
      ui.notifications.warn(game.i18n.localize("VERMINE.error_evolution_no_name"));
      return;
    }

    const error = VermineExperience.validateEvolutionPurchase(actor, cost, mutation);
    if (error) {
      ui.notifications.warn(game.i18n.localize(error));
      return;
    }

    const created = await actor.createEmbeddedDocuments("Item", [{
      name,
      type: "evolution",
      system: {
        level: { value: cost },
        mutation
      }
    }]);
    // Ne consomme que le coût du niveau choisi (Règles p. 116-117 : coût = niveau).
    if (!created || created.length === 0) {
      ui.notifications.warn(game.i18n.localize("VERMINE.error_evolution_create"));
      return;
    }
    await actor.update({ "system.experience.evolution": Math.max(0, (actor.system?.experience?.evolution || 0) - cost) });

    ui.notifications.info(game.i18n.localize("VERMINE.buy_evolution_done"));
    this.close();
  }
}