export enum HasKeysErrorCode {
    IS_NULL = "IS_NULL",
    IS_UNDEFINED = "IS_UNDEFINED",
    DOES_NOT_HAVE_KEY = "DOES_NOT_HAVE_KEY"
}

export function checkHasKeys<T extends string> (mixed : any, keys : T[]) : undefined|HasKeysErrorCode {
    if (mixed === null) {
        return HasKeysErrorCode.IS_NULL;
    }
    if (mixed === undefined) {
        return HasKeysErrorCode.IS_UNDEFINED;
    }
    for (let k of keys) {
        if (!mixed.hasOwnProperty(k)) {
            return HasKeysErrorCode.DOES_NOT_HAVE_KEY;
        }
    }
    return undefined;
}


export enum NotHasKeysErrorCode {
    IS_NULL = "IS_NULL",
    IS_UNDEFINED = "IS_UNDEFINED",
    HAS_KEY = "HAS_KEY"
}

export function checkNotHasKeys<T extends string> (mixed : any, keys : T[]) : undefined|NotHasKeysErrorCode {
    if (mixed === null) {
        return NotHasKeysErrorCode.IS_NULL;
    }
    if (mixed === undefined) {
        return NotHasKeysErrorCode.IS_UNDEFINED;
    }
    for (let k of keys) {
        if (mixed.hasOwnProperty(k)) {
            return NotHasKeysErrorCode.HAS_KEY;
        }
    }
    return undefined;
}