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/*
 * Copyright (C) 2021  Aravinth Manivannan <realaravinth@batsense.net>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
use lazy_static::lazy_static;
use redis_module::NotifyEvent;
use redis_module::{redis_command, redis_event_handler, redis_module};
use redis_module::{NextArg, RedisResult};
//use redis_module::RedisError;
use redis_module::Context;

mod bucket;
mod challenge;
mod errors;
mod mcaptcha;
mod safety;
mod utils;

use bucket::MCAPTCHA_BUCKET_TYPE;
use challenge::MCAPTCHA_CHALLENGE_TYPE;
use mcaptcha::MCAPTCHA_MCAPTCHA_TYPE;
use safety::MCAPTCHA_SAFETY_TYPE;

/// Initial allocation ammount of bucket[bucket::Bucket]
pub const HIT_PER_SECOND: usize = 100;
pub const PKG_NAME: &str = "mcap";
pub const PKG_VERSION: usize = 0;

/// bucket timer key prefix
// PREFIX_BUCKET_TIMER is used like this:
// PREFIX_BUCKET_TIMER:PREFIX_BUCKET:time(where time is variable)
// It contains PKG_NAME and key hash tag for node pinning
// so, I guess it's okay for us to just use timer and not enfore pinning
// and PKG_NAME
pub const PREFIX_BUCKET_TIMER: &str = "timer:";
pub const PREFIX_SAFETY: &str = "safety:";
/// If buckets perform clean up at x instant, then buckets themselves will get cleaned
/// up at x + BUCKET_EXPIRY_OFFSET(if they haven't already been cleaned up)
pub const BUCKET_EXPIRY_OFFSET: u64 = 30;

lazy_static! {
    /// node unique identifier, useful when running in cluster mode
    pub static ref ID: usize = {
        use rand::prelude::*;
        let mut rng = rand::thread_rng();
        rng.gen()
    };
    /// counter/captcha key prefix
    pub static ref PREFIX_CAPTCHA: String = format!("{}:captcha::", PKG_NAME);
    /// bucket key prefix
    pub static ref PREFIX_BUCKET: String = format!("{}:bucket:{{{}}}:", PKG_NAME, *ID);
    pub static ref PREFIX_CHALLENGE: String = format!("{}:CHALLENGE", PKG_NAME);
}

pub fn on_delete(ctx: &Context, event_type: NotifyEvent, event: &str, key_name: &str) {
    let msg = format!(
        "Received event: {:?} on key: {} via event: {}",
        event_type, key_name, event
    );
    ctx.log_debug(msg.as_str());

    if utils::is_bucket_timer(key_name) {
        bucket::Bucket::on_delete(ctx, event_type, event, key_name);
    } else if utils::is_mcaptcha_safety(key_name) {
        crate::safety::MCaptchaSafety::on_delete(ctx, event_type, event, key_name);
    }
}

#[allow(clippy::not_unsafe_ptr_arg_deref)]
pub mod redis {
    use super::*;

    redis_module! {
        name: "mcaptcha_cahce",
        version: PKG_VERSION,
        data_types: [MCAPTCHA_BUCKET_TYPE, MCAPTCHA_MCAPTCHA_TYPE, MCAPTCHA_SAFETY_TYPE, MCAPTCHA_CHALLENGE_TYPE],
        commands: [
            ["MCAPTCHA_CACHE.ADD_VISITOR", bucket::Bucket::counter_create, "write", 1, 1, 1],
            ["MCAPTCHA_CACHE.GET", mcaptcha::MCaptcha::get_count, "readonly", 1, 1, 1],
            ["MCAPTCHA_CACHE.ADD_CAPTCHA", mcaptcha::MCaptcha::add_captcha, "readonly", 1, 1, 1],
            ["MCAPTCHA_CACHE.DELETE_CAPTCHA", mcaptcha::MCaptcha::delete_captcha, "write", 1, 1, 1],
            ["MCAPTCHA_CACHE.CAPTCHA_EXISTS", mcaptcha::MCaptcha::captcha_exists, "readonly", 1, 1, 1],
            ["MCAPTCHA_CACHE.ADD_CHALLENGE", challenge::Challenge::create_challenge, "write", 1, 1, 1],
            ["MCAPTCHA_CACHE.GET_CHALLENGE", challenge::Challenge::get_challenge, "write", 1, 1, 1],
            ["MCAPTCHA_CACHE.DELETE_CHALLENGE", challenge::Challenge::delete_challenge, "write", 1, 1, 1],
        ],
       event_handlers: [
            [@EXPIRED @EVICTED: on_delete],
        ]
    }
}