import { FormaRuntime } from "./runtime.ts";
import { validateProject, type Project } from "./schema.ts";
import "./player.css";

const canvas = document.getElementById("game") as HTMLCanvasElement;
const ui = document.getElementById("game-ui")!;
ui.innerHTML = '<div class="loading">Загрузка проекта…</div>';

async function boot() {
  const response = await fetch("./project.forma.json");
  if (!response.ok) throw Error(`Project: HTTP ${response.status}`);
  const project: Project = await response.json();
  validateProject(project);
  if (project.settings.presentation) {
    ui.innerHTML = "";
    const runtime = new FormaRuntime(canvas, {
      log: (level, message) => {
        if (level === "error") {
          const error = document.createElement("div");
          error.id = "error";
          error.textContent = message;
          ui.replaceChildren(error);
        }
      },
    });
    window.addEventListener("pagehide", () => runtime.dispose(), {
      once: true,
    });
    await runtime.play(project);
    return;
  }
  ui.innerHTML = `<div class="hud"><div><strong id="title"></strong><small id="hint"></small></div><nav><button id="pause">Пауза</button><button id="restart">Перезапустить</button></nav></div><div class="touch"><div id="stick" aria-label="Джойстик"><i></i></div><div class="actions"><button id="jump" aria-label="Прыжок">↑</button><button id="action" aria-label="Действие">A</button></div></div><div id="error" hidden></div>`;
  document.getElementById("title")!.textContent = project.name;
  let firstPerson = false;
  const runtime = new FormaRuntime(canvas, {
    stats: (stats) => {
      firstPerson = stats.firstPerson;
      document.getElementById("hint")!.textContent = firstPerson
        ? "Клик · захват мыши / Esc · отпустить / WASD · ввод движения"
        : stats.twoD
          ? "WASD / стрелки · движение, пробел · прыжок"
          : "WASD и кнопки действий передаются скриптам проекта";
    },
    log: (level, message) => {
      if (level !== "error") return;
      const error = document.getElementById("error")!;
      error.hidden = false;
      error.textContent = message;
    },
  });
  const pause = document.getElementById("pause")!;
  const setPaused = (value: boolean) => {
    runtime.paused = value;
    runtime.releaseInput();
    pause.textContent = value ? "Продолжить" : "Пауза";
    if (value && document.pointerLockElement === canvas)
      document.exitPointerLock();
  };
  pause.onclick = () => setPaused(!runtime.paused);
  const restart = document.getElementById("restart") as HTMLButtonElement;
  restart.onclick = async () => {
    restart.disabled = true;
    try {
      await runtime.stop(project);
      await runtime.play(project);
      setPaused(false);
      document.getElementById("error")!.hidden = true;
    } catch (error) {
      const panel = document.getElementById("error")!;
      panel.hidden = false;
      panel.textContent = String(error);
    } finally {
      restart.disabled = false;
    }
  };
  const stick = document.getElementById("stick")!;
  const knob = stick.querySelector("i")!;
  let stickId: number | null = null;
  const move = (event: PointerEvent) => {
    if (event.pointerId !== stickId || runtime.paused) return;
    const bounds = stick.getBoundingClientRect();
    const x = (event.clientX - bounds.left - bounds.width / 2) / 35;
    const y = (event.clientY - bounds.top - bounds.height / 2) / 35;
    const length = Math.max(1, Math.hypot(x, y));
    runtime.touch.x = x / length;
    runtime.touch.z = -y / length;
    knob.style.transform = `translate(${(x / length) * 28}px,${(y / length) * 28}px)`;
  };
  stick.onpointerdown = (event) => {
    stickId = event.pointerId;
    stick.setPointerCapture(event.pointerId);
    move(event);
  };
  stick.onpointermove = move;
  stick.onpointerup = stick.onpointercancel = () => {
    stickId = null;
    runtime.touch.x = runtime.touch.z = 0;
    knob.style.transform = "";
  };
  for (const [id, input] of [
    ["jump", "jump"],
    ["action", "attack"],
  ] as const) {
    const button = document.getElementById(id)!;
    button.onpointerdown = (event) => {
      if (runtime.paused) return;
      button.setPointerCapture(event.pointerId);
      runtime.touch[input] = true;
      if (input === "jump") runtime.requestAction("jump");
    };
    button.onpointerup = button.onpointercancel = () => {
      runtime.touch[input] = false;
    };
  }
  const release = () => {
    stickId = null;
    runtime.releaseInput();
    knob.style.transform = "";
  };
  window.addEventListener("blur", release);
  document.addEventListener("visibilitychange", () => {
    release();
    if (document.hidden) setPaused(true);
  });
  window.addEventListener("pagehide", () => runtime.dispose(), { once: true });
  await runtime.play(project);
}
boot().catch((error) => {
  ui.textContent = "Не удалось открыть проект: " + String(error);
});