const state = {
	userId: localStorage.getItem("userId") || "",
	displayName: localStorage.getItem("displayName") || "",
};

const $ = (sel) => document.querySelector(sel),
	setText = (sel, v) => {
		const el = $(sel);
		if (el) el.textContent = v;
	};

const authStatusEl = $("#authStatus"),
	listStatusEl = $("#listStatus"),
	createStatusEl = $("#createStatus"),
	runNowStatusEl = $("#runNowStatus"),
	schedulesTbody = $("#schedulesTbody"),
	templatesUl = $("#templatesUl");

// update login ui from state
function paintAuth() {
	$("#userId").value = state.userId || "";
	$("#displayName").value = state.displayName || "";
	if (state.userId) {
		authStatusEl.textContent = `logged in as ${state.displayName ? state.displayName + " · " : ""
			}${state.userId}`;
	} else {
		authStatusEl.textContent = "not logged in";
	}
}

// wrap fetch to always attach x-user-id
async function apiFetch(url, options = {}) {
	const headers = new Headers(options.headers || {});
	if (!state.userId)
		throw new Error(
			"no user id set — use the login form first"
		);
	headers.set("x-user-id", state.userId); // custom header
	if (
		!headers.has("content-type") &&
		options.body &&
		!(options.body instanceof FormData)
	) {
		headers.set("content-type", "application/json");
	}

	const resp = await fetch(url, { ...options, headers });
	if (!resp.ok) {
		// try to surface json error bodies
		let msg = `${resp.status} ${resp.statusText}`;
		try {
			const data = await resp.json();
			if (data && data.error) msg = data.error;
		} catch { }
		throw new Error(msg);
	}
	return resp;
}

// render list
function renderSchedules(items = []) {
	schedulesTbody.innerHTML = "";
	items.forEach((it) => {
		const tr = document.createElement("tr");
		const tRef = it.templateRef
			? it.templateRef.clusterScope
				? `(cluster) ${it.templateRef.name}`
				: it.templateRef.name
			: "";
		tr.innerHTML = `
            <td>${escapeHtml(it.displayName || it.name || "")}</td>
            <td>${(it.schedules || []).map(escapeHtml).join("<br/>")}</td>
            <td>${escapeHtml(it.timezone || "")}</td>
            <td>${escapeHtml(tRef)}</td>
            <td>${escapeHtml(it.entrypoint || "")}</td>
            <td>${it.oneShot ? "yes" : "no"}</td>
            <td class="actions">
              <button data-del="${encodeURIComponent(it.name)}">delete</button>
            </td>
          `;
		schedulesTbody.appendChild(tr);
	});
}

// tiny escape helper
function escapeHtml(s = "") {
	return String(s)
		.replaceAll("&", "&amp;")
		.replaceAll("<", "&lt;")
		.replaceAll(">", "&gt;");
}

// wire up events
$("#loginForm").addEventListener("submit", (e) => {
	e.preventDefault();
	const userId = $("#userId").value.trim(),
		displayName = $("#displayName").value.trim();
	if (!userId) {
		authStatusEl.textContent = "please enter a user id";
		return;
	}
	state.userId = userId;
	state.displayName = displayName;
	localStorage.setItem("userId", state.userId);
	localStorage.setItem("displayName", state.displayName);
	paintAuth();
});

$("#logoutBtn").addEventListener("click", () => {
	localStorage.removeItem("userId");
	localStorage.removeItem("displayName");
	state.userId = "";
	state.displayName = "";
	paintAuth();
});

$("#refreshBtn").addEventListener("click", async () => {
	try {
		listStatusEl.textContent = "loading...";
		const res = await apiFetch("/api/schedules");
		const data = await res.json();
		renderSchedules(data.items || []);
		listStatusEl.textContent = `loaded ${Array.isArray(data.items) ? data.items.length : 0
			} schedule(s)`;
	} catch (e) {
		listStatusEl.textContent = `error: ${e.message}`;
	}
});

// delete handler (delegated)
schedulesTbody.addEventListener("click", async (e) => {
	const target = e.target;
	if (!(target instanceof HTMLButtonElement)) return;

	const name = target.getAttribute("data-del");
	if (!name) return;

	try {
		target.disabled = true;
		const res = await apiFetch(`/schedules/${name}`, {
			method: "DELETE",
		});

		if (res.status === 204) {
			target.closest("tr")?.remove();
			listStatusEl.textContent = "deleted";
		} else {
			listStatusEl.textContent = "unexpected response";
		}
	} catch (err) {
		listStatusEl.textContent = `error: ${err.message}`;
	} finally {
		target.disabled = false;
	}
});

// create/update schedule
$("#createForm").addEventListener("submit", async (e) => {
	e.preventDefault();
	try {
		createStatusEl.textContent = "saving...";
		const name = $("#name").value.trim(),
			tz = $("#tz").value.trim() || "America/New_York",
			iso = $("#iso").value
				? new Date($("#iso").value).toISOString()
				: "",
			cron = $("#cron").value.trim(),
			templateName = $("#templateName").value.trim(),
			entrypoint = $("#entrypoint").value.trim(),
			clusterScope = $("#clusterScope").checked,
			oneShot = $("#oneShot").checked,
			paramsRaw = $("#params").value.trim();

		let parameters = {};
		if (paramsRaw) {
			try {
				parameters = JSON.parse(paramsRaw);
			} catch {
				throw new Error("parameters must be valid json");
			}
		}

		const payload = {
			name,
			when: cron ? { cron } : { iso },
			tz,
			oneShot,
			template: { name: templateName, clusterScope },
			parameters,
			entrypoint: entrypoint || undefined,
		};

		await apiFetch("/schedules", {
			method: "POST",
			body: JSON.stringify(payload),
		});

		createStatusEl.textContent = "saved ✅";
		$("#refreshBtn").click();
	} catch (err) {
		createStatusEl.textContent = `error: ${err.message}`;
	}
});

// run now
$("#runNowForm").addEventListener("submit", async (e) => {
	e.preventDefault();
	try {
		runNowStatusEl.textContent = "starting...";
		const name = $("#rnName").value.trim() || "ad-hoc",
			templateName = $("#rnTemplateName").value.trim(),
			entrypoint = $("#rnEntrypoint").value.trim(),
			clusterScope = $("#rnClusterScope").checked,
			paramsRaw = $("#rnParams").value.trim();

		let parameters = {};
		if (paramsRaw) {
			try {
				parameters = JSON.parse(paramsRaw);
			} catch {
				throw new Error("parameters must be valid json");
			}
		}

		const payload = {
			name,
			template: { name: templateName, clusterScope },
			entrypoint: entrypoint || undefined,
			parameters,
		};

		await apiFetch("/run-now", {
			method: "POST",
			body: JSON.stringify(payload),
		});
		runNowStatusEl.textContent = "started ✅";
	} catch (err) {
		runNowStatusEl.textContent = `error: ${err.message}`;
	}
});

// load workflow templates for convenience
$("#loadTemplatesBtn").addEventListener("click", async () => {
	try {
		templatesUl.innerHTML = "";
		templatesUl.parentElement.open = true;

		const res = await apiFetch("/api/workflowtemplates"),
			data = await res.json();

		(data.items || []).forEach((t) => {
			const li = document.createElement("li");
			li.textContent = t.name;
			templatesUl.appendChild(li);
		});
	} catch (e) {
		templatesUl.innerHTML = `<li class="danger">error: ${escapeHtml(
			e.message
		)}</li>`;
	}
});

// boot
paintAuth();

// auto-refresh if already logged in
if (state.userId) $("#refreshBtn").click();