//SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
//SPDX-License-Identifier: GPL-3.0-or-later

#include "pool.h"

DB::Pool::Pool (Private):
    std::enable_shared_from_this<Pool>(),
    mutex(),
    conditional(),
    interfaces()
{}

DB::Pool::~Pool () {
}

std::shared_ptr<DB::Pool> DB::Pool::create () {
    return std::make_shared<Pool>(Private());
}

void DB::Pool::addInterfaces (
    Interface::Type type,
    std::size_t amount,
    const std::string & login,
    const std::string & password,
    const std::string & database,
    const std::string& path
) {
    std::unique_lock lock(mutex);
    for (std::size_t i = 0; i < amount; ++i) {
        const std::unique_ptr<Interface>& ref = interfaces.emplace(Interface::create(type));
        ref->setCredentials(login, password);
        ref->setDatabase(database);
        ref->connect(path);
    }

    lock.unlock();
    conditional.notify_all();
}

DB::Resource DB::Pool::request () {
    std::unique_lock lock(mutex);
    while (interfaces.empty())
        conditional.wait(lock);

    std::unique_ptr<Interface> interface = std::move(interfaces.front());
    interfaces.pop();
    return Resource(std::move(interface), shared_from_this());
}

void DB::Pool::free (std::unique_ptr<Interface> interface) {
    std::unique_lock lock(mutex);

    interfaces.push(std::move(interface));

    lock.unlock();
    conditional.notify_one();
}