(() => {
  const create = () => {
    const sceneEl = document.getElementById("scene-wrapper");
    const activeColorEl = document.getElementById("active-color");
    const chainLenEl = document.getElementById("chain-length");
    const spawnRateEl = document.getElementById("spawn-rate");
    const minLinkEl = document.getElementById("min-link");
    const paletteLegendEl = document.getElementById("palette-legend");
    const scoreEl = document.getElementById("score");
    const highScoreEl = document.getElementById("high-score");
    const sceneSelectEl = document.getElementById("scene-select");
    const gameOverEl = document.getElementById("game-over");
    const finalScoreEl = document.getElementById("final-score");
    const restartBtn = document.getElementById("restart-btn");
    const pauseBtn = document.getElementById("pause-btn");
    const pauseOverlay = document.getElementById("pause-overlay");
    const goalLabelEl = document.getElementById("goal-label");
    const goalProgressEl = document.getElementById("goal-progress");
    const winEl = document.getElementById("win-overlay");
    const winMessageEl = document.getElementById("win-message");
    const winNextBtn = document.getElementById("win-next");
    const winRestartBtn = document.getElementById("win-restart");

    const handlers = {
      onPauseToggle: null,
      onRestart: null,
      onSceneChange: null,
      onWinNext: null,
    };

    if (pauseBtn) {
      pauseBtn.addEventListener("click", () => {
        if (handlers.onPauseToggle) handlers.onPauseToggle();
      });
    }

    if (restartBtn) {
      restartBtn.addEventListener("click", () => {
        if (handlers.onRestart) handlers.onRestart();
      });
    }

    if (sceneSelectEl) {
      sceneSelectEl.addEventListener("change", (e) => {
        if (handlers.onSceneChange) handlers.onSceneChange(e.target.value);
      });
    }

    if (winNextBtn) {
      winNextBtn.addEventListener("click", () => {
        if (handlers.onWinNext) handlers.onWinNext();
      });
    }

    if (winRestartBtn) {
      winRestartBtn.addEventListener("click", () => {
        if (handlers.onRestart) handlers.onRestart();
      });
    }

    window.addEventListener("keydown", (e) => {
      if (e.key === "Escape" && handlers.onPauseToggle) {
        handlers.onPauseToggle();
      }
    });

    const setHandlers = (nextHandlers = {}) => {
      Object.assign(handlers, nextHandlers);
    };

    const setSceneOptions = (scenes, activeId) => {
      if (!sceneSelectEl) return;
      sceneSelectEl.innerHTML = "";
      scenes.forEach((scene) => {
        const opt = document.createElement("option");
        opt.value = scene.id;
        opt.textContent = scene.name;
        sceneSelectEl.appendChild(opt);
      });
      if (activeId) {
        sceneSelectEl.value = activeId;
      }
    };

    const setSceneSelection = (sceneId) => {
      if (sceneSelectEl) {
        sceneSelectEl.value = sceneId;
      }
    };

    const setPauseState = (paused) => {
      if (pauseOverlay) {
        pauseOverlay.classList.toggle("visible", paused);
      }
      if (pauseBtn) {
        pauseBtn.textContent = paused ? "Resume" : "Pause";
      }
    };

    const setGoal = ({ label, progress, colors }) => {
      if (goalLabelEl) {
        goalLabelEl.innerHTML = "";
        if (Array.isArray(colors) && colors.length > 0) {
          colors.forEach((color) => {
            const swatch = document.createElement("span");
            swatch.style.background = color;
            swatch.style.display = "inline-block";
            swatch.style.width = "14px";
            swatch.style.height = "14px";
            swatch.style.borderRadius = "50%";
            swatch.style.border = "1px solid rgba(255,255,255,0.2)";
            swatch.style.marginRight = "6px";
            goalLabelEl.appendChild(swatch);
          });
          const text = document.createElement("span");
          text.textContent = label || "";
          goalLabelEl.appendChild(text);
        } else {
          goalLabelEl.textContent = label || "—";
        }
      }
      if (goalProgressEl)
        goalProgressEl.style.width = `${Math.max(
          0,
          Math.min(100, progress ?? 0),
        )}%`;
    };

    const showWin = (message) => {
      if (winMessageEl) winMessageEl.textContent = message || "You win!";
      if (winEl) winEl.classList.add("visible");
    };

    const hideWin = () => {
      if (winEl) winEl.classList.remove("visible");
    };

    const showGameOver = (score) => {
      if (finalScoreEl) finalScoreEl.textContent = score;
      if (gameOverEl) gameOverEl.classList.add("visible");
    };

    const hideGameOver = () => {
      if (gameOverEl) gameOverEl.classList.remove("visible");
    };

    const spawnScorePopup = (point, amount, color) => {
      if (!point || !sceneEl) return;
      const el = document.createElement("div");
      el.className = "floating-score";
      el.textContent = `+${amount}`;
      el.style.left = `${point.x}px`;
      el.style.top = `${point.y}px`;
      el.style.color = color || "#e0f2fe";
      sceneEl.appendChild(el);
      setTimeout(() => el.remove(), 950);
    };

    const updateHud = ({
      spawnIntervalMs,
      minChain,
      chainLength,
      score,
      highScore,
      activeColor,
    }) => {
      if (spawnRateEl) spawnRateEl.textContent = `${spawnIntervalMs} ms`;
      if (minLinkEl) minLinkEl.textContent = minChain;
      if (chainLenEl) chainLenEl.textContent = chainLength;
      if (scoreEl) scoreEl.textContent = score;
      if (highScoreEl) highScoreEl.textContent = highScore;
      if (activeColorEl) {
        if (activeColor) {
          activeColorEl.textContent = "";
          activeColorEl.style.display = "inline-block";
          activeColorEl.style.width = "14px";
          activeColorEl.style.height = "14px";
          activeColorEl.style.borderRadius = "50%";
          activeColorEl.style.background = activeColor;
          activeColorEl.style.border = "1px solid rgba(255,255,255,0.3)";
        } else {
          activeColorEl.removeAttribute("style");
          activeColorEl.textContent = "—";
        }
      }
    };

    const buildLegend = (palette) => {
      if (!paletteLegendEl) return;
      paletteLegendEl.innerHTML = "";
      palette.forEach((color) => {
        const swatch = document.createElement("span");
        swatch.style.background = color;
        paletteLegendEl.appendChild(swatch);
      });
    };

    return {
      sceneEl,
      updateHud,
      buildLegend,
      spawnScorePopup,
      setPauseState,
      showGameOver,
      hideGameOver,
      showWin,
      hideWin,
      setSceneOptions,
      setSceneSelection,
      setHandlers,
      setGoal,
    };
  };

  window.PhysilinksUI = { create };
})();