import fs from "fs";
import git from "git-last-commit";
import { Singleton } from "tstl/thread/Singleton";
import { v4 } from "uuid";

import { ISystem } from "../../api/structures/monitors/ISystem";
import { DateUtil } from "../../utils/DateUtil";

export class SystemProvider {
    public static readonly uid: string = v4();
    public static readonly created_at: Date = new Date();

    public static package(): Promise<ISystem.IPackage> {
        return package_.get();
    }

    public static commit(): Promise<ISystem.ICommit> {
        return commit_.get();
    }
}

// LOAD COMMITS & PACKAGES
const commit_: Singleton<Promise<ISystem.ICommit>> = new Singleton(
    () =>
        new Promise((resolve, reject) => {
            git.getLastCommit((err, commit) => {
                if (err) reject(err);
                else
                    resolve({
                        ...commit,
                        authored_at: DateUtil.to_string(
                            new Date(Number(commit.authoredOn) * 1000),
                            true,
                        ),
                        commited_at: DateUtil.to_string(
                            new Date(Number(commit.committedOn) * 1000),
                            true,
                        ),
                    });
            });
        }),
);
const package_: Singleton<Promise<ISystem.IPackage>> = new Singleton(
    async () => {
        const content: string = await fs.promises.readFile(
            `${__dirname}/../../../../package.json`,
            "utf8",
        );
        return JSON.parse(content);
    },
);

commit_.get().catch(() => {});
package_.get().catch(() => {});