/*
 * This file is part of smolbote. It's copyrighted by the contributors recorded
 * in the version control history of the file, available from its original
 * location: https://neueland.iserlohn-fortress.net/cgit/smolbote
 *
 * SPDX-License-Identifier: GPL-3.0
 */

#pragma once

#include <configuration.h>
#include <fstream>
#include <cstdlib>
#include <filesystem>
#include <array>
#include <spdlog/spdlog.h>

inline auto init_conf(const std::string &path)
{
    namespace fs = std::filesystem;
    struct {
        std::optional<fs::path> path;
        std::unique_ptr<Configuration> ptr;
    } conf;

    conf.ptr = std::make_unique<Configuration, std::initializer_list<std::pair<std::string, conf_value_t>>>({
        @__DEFAULT_CFG__
    });

    conf.path = [&]() -> std::optional<fs::path> {
        if(!path.empty()) {
            return fs::path(path);
        }

        // 1000: invalid; 0: $HOME; 1: $XDG_CONFIG_HOME
        std::array<std::optional<fs::path>, 2> home = { std::nullopt, std::nullopt };
        if(const char* usr = std::getenv("HOME"))
            home[0] = fs::path(usr);
        if(const char* xdg = std::getenv("XDG_CONFIG_HOME"))
            home[1] = fs::path(xdg);

        for(const auto &pair : {
                @__CONFIG_PATHS__
            }) {
            if(pair.first < 0) {
                auto p = fs::path(pair.second);
                spdlog::debug("Trying {}", p.c_str());
                if(fs::exists(p))
                    return p;
            } else if(home[static_cast<std::size_t>(pair.first)]) {
                auto p = home[static_cast<std::size_t>(pair.first)].value() / pair.second;
                spdlog::debug("Trying {}", p.c_str());
                if(fs::exists(p))
                    return p;
            }
        }

        return std::nullopt;

    }();

    if(conf.path) {
        std::fstream file(conf.path.value(), std::fstream::in);
        if(file.is_open()) {
            conf.ptr->read(file);
            file.close();
        }
    }
    return conf;
}