import { BG_OUTER } from "./colors.ts";
import { D, I } from "./engine/public.ts";
import { IGame, Point, Size } from "./engine/datatypes.ts";
import { getHotbar, Hotbar } from "./hotbar.ts";
import { getSkillsModal, SkillsModal } from "./skillsmodal.ts";
import { getVNModal, VNModal } from "./vnmodal.ts";
import { Gameplay, getGameplay } from "./gameplay.ts";
import { getEndgameModal } from "./endgamemodal.ts";
import { CheckModal, getCheckModal } from "./checkmodal.ts";

export class Game implements IGame {
  #mainThing: Gameplay | VNModal | null;
  #bottomThing: CheckModal | SkillsModal | Hotbar | null;

  constructor() {
    this.#mainThing = null;
    this.#bottomThing = null;
  }

  update() {
    D.camera = new Point(0, 0);

    // state-specific updates
    this.updateGameplay();
  }

  draw() {
    // draw screen background
    let oldCamera = D.camera;
    D.camera = new Point(0, 0);
    D.fillRect(new Point(0, 0), D.size, BG_OUTER);
    D.camera = oldCamera;

    this.drawGameplay();

    // we draw all states at once and pan between them
    // mainFont.drawText({ctx: ctx, text: "You have been given a gift.", x: 0, y: 0})
    let mouse = I.mousePosition?.offset(D.camera);
    if (mouse != null) {
      D.invertRect(mouse.offset(new Point(-1, -1)), new Size(3, 3));
    }
  }

  updateGameplay() {
    this.#chooseMainThing();
    this.#chooseBottomThing();

    this.#mainThing?.update();

    if (!this.#mainThing?.blocksHud) {
      this.#bottomThing?.update();
    }
  }

  drawGameplay() {
    this.#mainThing?.draw();

    if (!this.#mainThing?.blocksHud) {
      this.#bottomThing?.draw();
    }
  }

  #chooseBottomThing() {
    // This is explicitly chosen because we would prefer that
    // the same bottomThing be used in both draw and update,
    // meaning that events after this in updateGameplay should not affect
    // its value

    let checkModal = getCheckModal();
    if (checkModal.isShown) {
      this.#bottomThing = checkModal;
      return;
    }

    let skillsModal = getSkillsModal();
    if (skillsModal.isShown) {
      this.#bottomThing = skillsModal;
      return;
    }

    // use the hotbar only as a matter of last resort
    this.#bottomThing = getHotbar();
  }

  #chooseMainThing() {
    let vnModal = getVNModal();
    if (vnModal.isShown) {
      this.#mainThing = vnModal;
      return;
    }

    let endgameModal = getEndgameModal();
    if (endgameModal.isShown) {
      this.#mainThing = endgameModal;
      return;
    }

    this.#mainThing = getGameplay();
  }
}

export let game = new Game();