//Adapted from https://github.com/nickadam/kv
//Original Author Nick Vissari

'use strict';
import better_sqlite3 from 'better-sqlite3';

export default class SQLITEKeyValue {
    private sqlite;

    constructor(private path: string) {}

    public init() {
        // connect to sqlite
        this.sqlite = new better_sqlite3(this.path);
        // initialize kv table
        this.sqlite.exec(
            'CREATE TABLE IF NOT EXISTS kv (k TEXT PRIMARY KEY, v TEXT, timestamp DATETIME DEFAULT CURRENT_TIMESTAMP)'
        );
    }

    public get(key: string): any {
        let q = 'SELECT * FROM kv WHERE k = ?';

        let data = [];

        // eslint-disable-next-line no-constant-condition
        while (true) {
            try {
                data = this.sqlite.prepare(q).all(key);
                break;
            } catch (err) {
                continue;
            }
        }

        // parse the values
        data = data.map((x) => {
            x.v = JSON.parse(x.v);
            return x;
        });

        if (data.length == 0) {
            return null;
        }

        return data[0].v;
    }

    public set(key: string, value: any) {
        let q = 'INSERT INTO kv (k,v) VALUES (@k, @v) ON CONFLICT(k) DO UPDATE SET v=@v,timestamp=CURRENT_TIMESTAMP';
        const data = {
            k: key,
            v: JSON.stringify(value),
        };

        // eslint-disable-next-line no-constant-condition
        while (true) {
            try {
                this.sqlite.prepare(q).run(data);
                break;
            } catch (err) {
                continue;
            }
        }
    }
}