import { state } from "./state";
import { safeLocalStorage } from "./storage";
import { loadVideoSource } from "./video";

// same as mode.ts - could be extracted to shared util
const streamUrlForMode = (mode: string, quality?: string): string => {
  const src = state.modeSources[mode];
  if (!src?.token) return "";
  let url = `${state.streamURL}?mode=${encodeURIComponent(mode)}&token=${encodeURIComponent(src.token)}`;
  if (quality && quality !== "best") url += `&quality=${encodeURIComponent(quality)}`;
  return url;
};

/**
 * Switches video quality (resolution).
 * Persists preference to localStorage.
 */
export const switchQuality = (quality: string): void => {
  const url = streamUrlForMode(state.currentMode, quality);
  if (!url) return;
  safeLocalStorage.setItem("mal:preferred-quality", quality);
  loadVideoSource(url);
};

/**
 * Rebuilds quality dropdown options from current mode's available qualities.
 * Shows/hides dropdown based on availability.
 */
export const updateQualityOptions = (): void => {
  const select = state.container.querySelector("[data-quality-select]") as HTMLSelectElement | null;
  if (!select) return;
  const qualities = state.modeSources[state.currentMode]?.qualities ?? [];
  select.innerHTML = "";

  const best = document.createElement("option");
  best.value = "best";
  best.textContent = "Auto / Best";
  select.appendChild(best);

  qualities.forEach((q) => {
    const opt = document.createElement("option");
    opt.value = q;
    opt.textContent = q;
    select.appendChild(opt);
  });

  // restore saved preference
  const preferred = safeLocalStorage.getItem("mal:preferred-quality") || "best";
  select.value = qualities.includes(preferred) ? preferred : "best";

  // hide if no quality options
  const wrapper = select.parentElement;
  wrapper?.classList.toggle("hidden", qualities.length === 0);
};

/**
 * Binds quality select change handler.
 */
export const setupQuality = (): void => {
  const select = state.container.querySelector("[data-quality-select]") as HTMLSelectElement | null;
  select?.addEventListener("change", (e) => {
    switchQuality((e.target as HTMLSelectElement).value);
  });
};