// Handles most of the file system operations, all of the ones related to `data` at least.
import fs from "fs";

const Storage = {
    read(header: string): object {
        this.open("data");
        const path = `data/${header}.json`;
        let data = {};

        if (fs.existsSync(path)) {
            const file = fs.readFileSync(path, "utf-8");

            try {
                data = JSON.parse(file);
            } catch (error) {
                if (process.argv[2] !== "dev") {
                    console.warn("[storage.read]", `Malformed JSON data (header: ${header}), backing it up.`, file);
                    fs.writeFile(`${path}.backup`, file, (error) => {
                        if (error) console.error("[storage.read]", error);
                        console.log("[storage.read]", `Backup file of "${header}" successfully written as ${file}.`);
                    });
                }
            }
        }

        return data;
    },
    // There is no need to log successfully written operations as it pollutes the log with useless info for debugging.
    write(header: string, data: object, asynchronous = true) {
        this.open("data");
        const path = `data/${header}.json`;

        if (IS_DEV_MODE || header === "config") {
            const result = JSON.stringify(data, null, "\t");

            if (asynchronous)
                fs.writeFile(path, result, (error) => {
                    if (error) console.error("[storage.write]", error);
                });
            else fs.writeFileSync(path, result);
        } else {
            const result = JSON.stringify(data);

            if (asynchronous)
                fs.writeFile(path, result, (error) => {
                    if (error) console.error("[storage.write]", error);
                });
            else fs.writeFileSync(path, result);
        }
    },
    open(path: string, filter?: (value: string, index: number, array: string[]) => unknown): string[] {
        if (!fs.existsSync(path)) fs.mkdirSync(path);

        let directory = fs.readdirSync(path);

        if (filter) directory = directory.filter(filter);

        return directory;
    },
    close(path: string) {
        if (fs.existsSync(path) && fs.readdirSync(path).length === 0)
            fs.rmdir(path, (error) => {
                if (error) console.error("[storage.close]", error);
            });
    }
};

export default Storage;