// Shared side-nav behavior (collapse/expand, mobile drawer) for every authenticated page
// (planner, account, admin) so each page's own script doesn't reimplement it.

// Single source of truth for the page links, grouped by workflow — every page renders this
// into its <div id="nav-links"> instead of hand-maintaining a diverging copy of the nav.
// Page-specific tool buttons (the planner's drawers) stay in that page's own markup below it.
const NAV_GROUPS = [
	{
		title: "Roasting",
		items: [
			{ href: "/app", icon: "◐", label: "Planner" },
			{ href: "/roasts", icon: "∿", label: "Roasts" },
			{ href: "/roasters", icon: "♨", label: "Machines" },
			{ href: "/inventory", icon: "▥", label: "Green lots" },
			{ href: "/cupping", icon: "◒", label: "Cupping" },
		],
	},
	{
		title: "Brewing",
		items: [
			{ href: "/brews", icon: "◉", label: "Brews" },
			{ href: "/beans", icon: "◍", label: "Beans" },
			{ href: "/gear", icon: "⚒", label: "Equipment" },
		],
	},
	{
		title: null,
		items: [
			{ href: "/account", icon: "◔", label: "Account" },
			{ href: "/api-docs", icon: "⌗", label: "API docs" },
			{ href: "/admin", icon: "⚙", label: "Admin", id: "nav-admin", hidden: true },
		],
	},
];

export function renderNavLinks() {
	const mount = document.getElementById("nav-links");
	if (!mount) return;
	mount.replaceChildren(
		...NAV_GROUPS.map((group) => {
			const wrap = document.createElement("div");
			wrap.className = "nav-group";
			if (group.title) {
				const title = document.createElement("div");
				title.className = "nav-group-title";
				title.textContent = group.title;
				wrap.append(title);
			}
			for (const item of group.items) {
				const a = document.createElement("a");
				a.className = "nav-item";
				if (item.hidden) a.classList.add("hidden");
				if (item.id) a.id = item.id;
				a.href = item.href;
				if (item.href === location.pathname) a.setAttribute("aria-current", "page");
				const icon = document.createElement("span");
				icon.className = "nav-icon";
				icon.setAttribute("aria-hidden", "true");
				icon.textContent = item.icon;
				const label = document.createElement("span");
				label.className = "nav-label";
				label.textContent = item.label;
				a.append(icon, label);
				wrap.append(a);
			}
			return wrap;
		}),
	);
}

export function initSideNav() {
	renderNavLinks();
	const nav = document.getElementById("side-nav");
	const hamburger = document.getElementById("nav-hamburger");
	const collapseBtn = document.getElementById("nav-collapse");
	const workspace = document.getElementById("app-workspace");
	const overlay = document.getElementById("drawer-overlay");
	const COLLAPSE_KEY = "roastPlannerNavCollapsed";

	function closeMobileNav() {
		nav.classList.remove("mobile-open");
		hamburger?.setAttribute("aria-expanded", "false");
		if (!document.querySelector(".drawer:not(.hidden)"))
			overlay?.classList.add("hidden");
	}
	hamburger?.addEventListener("click", () => {
		const open = nav.classList.toggle("mobile-open");
		hamburger.setAttribute("aria-expanded", String(open));
		overlay?.classList.toggle("hidden", !open);
	});
	overlay?.addEventListener("click", closeMobileNav);
	document.addEventListener("keydown", (event) => {
		if (event.key === "Escape") closeMobileNav();
	});

	function applyCollapsed(collapsed) {
		nav.classList.toggle("collapsed", collapsed);
		workspace?.classList.toggle("nav-collapsed", collapsed);
		if (collapseBtn) {
			collapseBtn.textContent = collapsed ? "»" : "«";
			collapseBtn.setAttribute(
				"aria-label",
				collapsed ? "Expand navigation" : "Collapse navigation",
			);
		}
	}
	applyCollapsed(localStorage.getItem(COLLAPSE_KEY) === "true");
	collapseBtn?.addEventListener("click", () => {
		const next = !nav.classList.contains("collapsed");
		applyCollapsed(next);
		localStorage.setItem(COLLAPSE_KEY, String(next));
	});
	return { closeMobileNav };
}

/** Renders a user's avatar into an element: their profile picture when set, else initial. */
export function applyAvatar(el, user, cacheBust = false) {
	if (user.hasAvatar) {
		el.textContent = "";
		el.style.backgroundImage = `url("/api/account/avatar${cacheBust ? `?t=${Date.now()}` : ""}")`;
		el.style.backgroundSize = "cover";
		el.style.backgroundPosition = "center";
	} else {
		el.style.backgroundImage = "";
		el.textContent = user.email.charAt(0).toUpperCase();
	}
}

/** Populates the nav's user chip and admin link; redirects to /login when signed out. */
export async function loadNavUser() {
	const response = await fetch("/api/auth/me");
	if (!response.ok) {
		location.replace("/login");
		return null;
	}
	const { user } = await response.json();
	const emailEl = document.getElementById("account-email");
	if (emailEl) emailEl.textContent = user.email;
	const avatarEl = document.getElementById("nav-user-avatar");
	if (avatarEl) applyAvatar(avatarEl, user);
	if (user.role === "admin")
		document.getElementById("nav-admin")?.classList.remove("hidden");
	return user;
}