import { Setting } from "./setting"

let settingsPath = ""
export function nodeSetting(key: string): Setting {
    let v: string
    let keyPath: string
    const fs = require("fs")
    function init() {
        if (!settingsPath) {
            const jd = process.env["HOME"] + "/.jacdac"
            try {
                fs.mkdirSync(jd)
            } catch {}
            settingsPath = jd + "/settings"
            try {
                fs.mkdirSync(settingsPath)
            } catch {}
        }
        if (!keyPath) {
            keyPath =
                settingsPath +
                "/" +
                key.replace(/[^a-z_\-]/g, c => c.charCodeAt(0) + "")
            try {
                v = fs.readFileSync(keyPath, "utf8")
            } catch {
                v = undefined
            }
        }
    }
    function get() {
        init()
        return v
    }
    function set(nv: string) {
        init()
        if (v !== nv) {
            v = nv
            fs.writeFileSync(keyPath, nv, "utf8")
        }
    }
    return { get, set }
}