import Conf from "conf";
import chalk from "chalk";
import { isRefineUptoDate } from "@commands/check-updates";
import { printUpdateWarningTable } from "@components/update-warning-table";
import { RefinePackageInstalledVersionData } from "@definitions/package";
import { getInstalledRefinePackages } from "@utils/package";
import { ENV } from "@utils/env";
import { stringToBase64 } from "@utils/encode";

const STORE_NAME = "refine-update-notifier";

export interface Store {
    key: string;
    lastUpdated: number;
    packages: RefinePackageInstalledVersionData[];
}

export const store = new Conf<Store>({
    projectName: STORE_NAME,
    defaults: {
        key: "",
        lastUpdated: 0,
        packages: [],
    },
});

// update notifier should not throw any unhandled error to prevent breaking user workflow.
export const updateNotifier = async () => {
    if (isUpdateNotifierDisabled()) return;

    const shouldUpdate = await shouldUpdatePackagesCache();
    if (shouldUpdate === null) return;
    if (shouldUpdate) {
        updatePackagesCache();
        return;
    }

    showWarning();
    updatePackagesCache();
};

/**
 * renders outdated packages table if there is any
 */
const showWarning = async () => {
    const packages = store.get("packages");
    if (!packages?.length) return;

    await printUpdateWarningTable({ data: packages });
    console.log("\n");
};

/**
 * @returns `null` It's mean something went wrong while checking key or cache. so we should not update cache.
 * @returns `boolean` if cache should be updated or not
 *   if cache is expired or key is invalid, update cache in background and not show warning
 */
export const shouldUpdatePackagesCache = async () => {
    const isKeyValid = await validateKey();
    const isExpired = isPackagesCacheExpired();

    if (isKeyValid === null) return null;

    if (isExpired || !isKeyValid) return true;

    return false;
};

/**
 * @returns `null` something went wrong
 * @returns `packages` if packages updated
 */
export const updatePackagesCache = async () => {
    try {
        const packages = await isRefineUptoDate();

        store.set("packages", packages);
        store.set("lastUpdated", Date.now());
        store.set("key", await generateKeyFromPackages());

        return packages;
    } catch (error) {
        // invalidate store
        store.set("packages", []);
        store.set("lastUpdated", Date.now());
        store.set("key", "");
        return null;
    }
};

export const isPackagesCacheExpired = () => {
    const lastUpdated = store.get("lastUpdated");

    if (!lastUpdated) return true;

    const now = Date.now();

    const diff = now - lastUpdated;
    const cacheTTL = Number(ENV.UPDATE_NOTIFIER_CACHE_TTL);

    return diff >= cacheTTL;
};

/**
 * @returns `true` if key is valid
 * @returns `false` if key is invalid
 * @returns `null` if there is an error
 */
export const validateKey = async () => {
    const key = store.get("key");
    const newKey = await generateKeyFromPackages();

    if (newKey === null) return null;

    return key === newKey;
};

/**
 * @returns `null` if there is an error
 * @returns `string` if key is generated
 */
export const generateKeyFromPackages = async () => {
    const packages = await getInstalledRefinePackages();
    if (!packages) {
        console.error(
            chalk.red(
                `Something went wrong when trying to get installed \`refine\` packages.`,
            ),
        );

        return null;
    }

    const currentVersionsWithName = packages.map(
        (p) => `${p.name}@${p.version}`,
    );
    const hash = stringToBase64(currentVersionsWithName.toString());

    return hash;
};

export const isUpdateNotifierDisabled = () => {
    return ENV.UPDATE_NOTIFIER_IS_DISABLED.toLocaleLowerCase() === "true";
};