#include <stdexcept>
#include <nlohmann/json.hpp>

#include "hex.h"
#include "file.h"
#include "config.h"

Config config;

void load_config(const char* path) {
    File config_file(path, "r");
    config = nlohmann::json::parse(config_file.get());
}

RedisConfig get_redis_config(const nlohmann::json& j) {
    using namespace std::string_literals;

    RedisConfig redis_config;
    const nlohmann::json& connection = j.at("connection");
    const std::string& connection_type = connection.at("type").get_ref<const std::string&>();
    if (connection_type == "ip") {
        redis_config.connection_method = IPConnection{
            connection.at("address").get<std::string>(),
            connection.at("port").get<int>()
        };
    } else if (connection_type == "unix") {
        redis_config.connection_method = UnixConnection{connection.at("unix").get<std::string>()};
    } else {
        throw std::invalid_argument("Unknown redis connection type: "s + connection_type);
    }

    if (j.at("username").is_string()) {
        redis_config.username = j["username"].get<std::string>();
    }
    if (j.at("password").is_string()) {
        redis_config.password = j["password"].get<std::string>();
    }

    return redis_config;
}

void from_json(const nlohmann::json& j, Config& conf) {
    using namespace std::string_literals;

    j.at("bind_host").get_to(conf.bind_host);
    j.at("bind_port").get_to(conf.bind_port);
    if (conf.bind_port < 0) {
        throw std::invalid_argument("Invalid port to bind to: "s + std::to_string(conf.bind_port));
    }

    conf.hmac_key = hex_decode(j.at("hmac_key").get_ref<const std::string&>());
    if (j.at("canonical_origin").is_string()) {
        conf.canonical_origin = j["canonical_origin"].get<std::string>();
    }
    if (j.at("redis").at("enabled").get<bool>()) {
        conf.redis_config = get_redis_config(j["redis"]);
    }
}