const c = console;

const ENDPOINT = "https://huggingface.co";

async function whoami(token: string): Promise<{ name: string }> {
	const path = `${ENDPOINT}/api/whoami-v2`;
	const res = await fetch(path, {
		headers: {
			Authorization: `Bearer ${token}`,
		}
	});
	return await res.json();
}

/**
 * @returns `str`: full URL to the newly created repo.
 */
async function createRepo(
	token: string,
	repoName: string,
	repoType: "model" | "dataset" | "space",
): Promise<string> {
	const path = `${ENDPOINT}/api/repos/create`;
	const res = await fetch(path, {
		method: "POST",
		headers: {
			Authorization: `Bearer ${token}`,
			"Content-Type": "application/json",
		},
		body: JSON.stringify({
			name: repoName,
			type: repoType,
		})
	});
	const output = await res.json();
	if (!res.ok) {
		throw new Error(`Error ${res.status}: ${output.error ?? output}`);
	}
	return output.url;
}

/**
 * @returns `str`: URL to the newly uploaded blob.
 */
 async function uploadFile(
	token: string,
	repoId: string,
	repoType: "model" | "dataset" | "space",
	filename: string,
	blob: Blob,
): Promise<string> {
	const prefix = (repoType === "dataset") ? "/datasets"
		: (repoType === "space") ? "/spaces"
		: "";
	const path = `${ENDPOINT}/api${prefix}/${repoId}/upload/main/${filename}`;
	const res = await fetch(path, {
		method: "POST",
		headers: {
			Authorization: `Bearer ${token}`,
		},
		body: blob
	});
	const output = await res.json();
	if (!res.ok) {
		throw new Error(`Error ${res.status}: ${output.error ?? output}`);
	}
	return output.url;
}


const FILES_TO_UPLOAD = [
	"./mobilenet/model.json",
	"./mobilenet/group1-shard1of2",
	"./mobilenet/group1-shard2of2",
	"./mobilenet/coffee.jpg",
	"./mobilenet/README.md",
];

function filenameFromURL(url: string): string {
	return url.substring(url.lastIndexOf("/") + 1);
}

window.addEventListener("load", function () {
	const tokenEl = document.querySelector<HTMLInputElement>("#token")!;
	const repoNameEl = document.querySelector<HTMLInputElement>("#repo_name")!;
	const button = document.querySelector("#submit")!;
	const output = document.querySelector("#logs")!;
	
	const storedToken = window.localStorage.getItem("hf_token");
	if (storedToken) {
		tokenEl.value = storedToken;
		/// ^to help in dev.
	}
	
	repoNameEl.value = `tfjs-mobilenet-${Date.now() % 1_000}`;
	/// "random" repo name
	
	button.addEventListener("click", async function () {
		const token = tokenEl.value;
		const repoName = repoNameEl.value;
		if (!token || !repoName) {
			alert("You need a token and a repo name");
			return;
		}

		button.setAttribute("disabled", "disabled");
		try {
			const fullUrl = await createRepo(token, repoName, "model");
			const repoId = fullUrl.replace(ENDPOINT, "").replace(/^\//, "");
			for (const file of FILES_TO_UPLOAD) {
				const blob = await (await fetch(file)).blob();
				await uploadFile(token, repoId, "model", filenameFromURL(file), blob);
			}
			button.insertAdjacentHTML(
				"afterend",
				`<div class="text-green-500 mb-6">🎉 Upload complete! Model page is <a target="_blank" class="text-bold underline" href="${fullUrl}">${fullUrl}</a></div>`
			);
		} catch (err) {
			output.append("\n"+err);
		}
		button.removeAttribute("disabled");
	});
});