import fs from "fs";
import path from "path";
import _ from "lodash";
import type { BunMariaDBConfig } from "../types";
import { AppData } from "../data/app-data";
import grabDBDir from "./grab-db-dir";
import grabSortedExports from "./grab-sorted-exports";

type Params = {
    config: BunMariaDBConfig;
};

export default function trimExports({ config }: Params) {
    const { export_dir } = grabDBDir({ config });
    // Only consider archives written by `export` (`{db_name}-{timestamp}.tar.gz|zip`)
    const exportNamePattern = new RegExp(
        `^${_.escapeRegExp(config.db_name)}-\\d+\\.(tar\\.gz|zip)$`,
    );

    const exports = grabSortedExports({ config }).filter(
        (name) =>
            exportNamePattern.test(name) &&
            fs.statSync(path.join(export_dir, name)).isFile(),
    );
    const max_exports = config.max_exports || AppData["MaxExports"];

    for (let i = 0; i < exports.length; i++) {
        const export_name = exports[i];
        if (!export_name) continue;
        if (i > max_exports - 1) {
            fs.unlinkSync(path.join(export_dir, export_name));
        }
    }
}