import { trackError } from "@/features/analytics";
import { CollectionItem } from "@/models/CollectionModels";
import getLogger from "@/utils/getLogger";
import sendNotification from "@/utils/sendNotification";
import { compress } from "lzutf8";
import { collectionStorage } from "./collectionStorage";
import getChunkKeys from "./getChunkKeys";
import serializeCollections from "./serializeCollections";

const logger = getLogger("saveCollectionsToCloud");

export default async function saveCollectionsToCloud(collections: CollectionItem[], timestamp: number): Promise<void>
{
	try
	{
		if (!collections || collections.length < 1)
		{
			await browser.storage.sync.set({
				[getStorageKey(collectionStorage.chunkCount)]: 0,
				[getStorageKey(collectionStorage.syncLastUpdated)]: timestamp
			});
			await browser.storage.sync.remove(getChunkKeys());
			return;
		}

		const data: string = compress(serializeCollections(collections), { outputEncoding: "Base64" });
		const chunks: string[] = splitIntoChunks(data);

		if (chunks.length > collectionStorage.maxChunkCount)
			throw new Error("Data is too large to be stored in sync storage.");

		// Since there's a limit for cloud write operations, we need to write all chunks in one go.
		const newRecords: Record<string, string | number> =
		{
			[getStorageKey(collectionStorage.chunkCount)]: chunks.length,
			[getStorageKey(collectionStorage.syncLastUpdated)]: timestamp
		};

		for (let i = 0; i < chunks.length; i++)
			newRecords[`c${i}`] = chunks[i];

		await browser.storage.sync.set(newRecords);

		if (chunks.length < collectionStorage.maxChunkCount)
			await browser.storage.sync.remove(getChunkKeys(chunks.length));
	}
	catch (ex)
	{
		logger("Failed to save cloud storage");
		console.error(ex);
		trackError("cloud_save_error", ex as Error);

		if ((ex as Error).message.includes("MAX_WRITE_OPERATIONS_PER_MINUTE"))
			await sendNotification({
				title: i18n.t("notifications.error_quota_exceeded.title"),
				message: i18n.t("notifications.error_quota_exceeded.message"),
				icon: "/notification_icons/cloud_error.png"
			});
		else
			await sendNotification({
				title: i18n.t("notifications.error_storage_full.title"),
				message: i18n.t("notifications.error_storage_full.message"),
				icon: "/notification_icons/cloud_error.png"
			});
	}
}

function splitIntoChunks(data: string): string[]
{
	// QUOTA_BYTES_PER_ITEM includes length of key name, length of content and 2 more bytes (for unknown reason).
	const chunkKey: string = getChunkKeys(collectionStorage.maxChunkCount - 1)[0];
	const chunkSize = (browser.storage.sync.QUOTA_BYTES_PER_ITEM ?? 8192) - chunkKey.length - 2;
	const chunks: string[] = [];

	for (let i = 0; i < data.length; i += chunkSize)
		chunks.push(data.slice(i, i + chunkSize));

	return chunks;
}

function getStorageKey(storageItem: WxtStorageItem<any, any>): string
{
	return storageItem.key.split(":")[1];
}