// trifid-api, an open source reimplementation of the Defined Networking nebula management server.
//     Copyright (C) 2023 c0repwn3r
//
//     This program is free software: you can redistribute it and/or modify
//     it under the terms of the GNU General Public License as published by
//     the Free Software Foundation, either version 3 of the License, or
//     (at your option) any later version.
//
//     This program is distributed in the hope that it will be useful,
//     but WITHOUT ANY WARRANTY; without even the implied warranty of
//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//     GNU General Public License for more details.
//
//     You should have received a copy of the GNU General Public License
//     along with this program.  If not, see <https://www.gnu.org/licenses/>.

use actix_web::http::header::HeaderValue;
use rand::Rng;

pub const ID_CHARSET: &[u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
pub const ID_LEN: u32 = 26;

pub const TOKEN_CHARSET: &[u8] =
    b"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_";
pub const TOKEN_LEN: u32 = 43;

// 26
// format: [ID]-[26 chars]
pub fn random_id(identifier: &str) -> String {
    format!("{}-{}", identifier, random_with_charset(ID_LEN, ID_CHARSET))
}

// 26
// format: [ID]-[26 chars]
pub fn random_id_no_id() -> HeaderValue {
    HeaderValue::from_str(&random_with_charset(ID_LEN, ID_CHARSET)).unwrap()
}

// 43
// format: [TYPE]-[43 chars]
pub fn random_token(identifier: &str) -> String {
    format!(
        "{}-{}",
        identifier,
        random_with_charset(TOKEN_LEN, TOKEN_CHARSET)
    )
}

fn random_with_charset(len: u32, charset: &[u8]) -> String {
    (0..len)
        .map(|_| {
            let idx = rand::thread_rng().gen_range(0..charset.len());
            charset[idx] as char
        })
        .collect()
}

pub fn get_token_type(token: &str) -> Option<&str> {
    token.split('-').collect::<Vec<&str>>().first().copied()
}