/*
 * libjmap
 *
 * Copyright 2019 Manos Pitsidianakis
 *
 * This file is part of libjmap.
 *
 * libjmap 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.
 *
 * libjmap 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 libjmap. If not, see <http://www.gnu.org/licenses/>.
 */

use super::*;
use serde::Serialize;
use serde_json::Value;

pub type UtcDate = String;

use super::rfc8620::Object;

macro_rules! get_request_no {
    ($lock:expr) => {{
        let mut lck = $lock.lock().unwrap();
        let ret = *lck;
        *lck += 1;
        ret
    }};
}

pub trait Response<OBJ: Object> {
    const NAME: &'static str;
}

pub trait Method<OBJ: Object>: Serialize {
    const NAME: &'static str;
}

static USING: &[&str] = &["urn:ietf:params:jmap:core", "urn:ietf:params:jmap:mail"];

#[derive(Serialize)]
#[serde(rename_all = "camelCase")]
pub struct Request {
    using: &'static [&'static str],
    /* Why is this Value instead of Box<dyn Method<_>>? The Method trait cannot be made into a
     * Trait object because its serialize() will be generic. */
    method_calls: Vec<Value>,

    #[serde(skip)]
    request_no: Arc<Mutex<usize>>,
}

impl Request {
    pub fn new(request_no: Arc<Mutex<usize>>) -> Self {
        Request {
            using: USING,
            method_calls: Vec::new(),
            request_no,
        }
    }

    pub fn add_call<M: Method<O>, O: Object>(&mut self, call: &M) -> usize {
        let seq = get_request_no!(self.request_no);
        self.method_calls
            .push(serde_json::to_value((M::NAME, call, &format!("m{}", seq))).unwrap());
        seq
    }
}

#[derive(Deserialize, Debug)]
#[serde(rename_all = "camelCase")]
pub struct JsonResponse<'a> {
    #[serde(borrow)]
    method_responses: Vec<MethodResponse<'a>>,
}