//  OpenVPN 3 Linux client -- Next generation OpenVPN client
//
//  SPDX-License-Identifier: AGPL-3.0-only
//
//  Copyright (C) 2018 - 2023  OpenVPN Inc <sales@openvpn.net>
//  Copyright (C) 2018 - 2023  David Sommerseth <davids@openvpn.net>
//

/**
 * @file   cmdparser.cpp
 *
 * @brief  Simple test for the command line parser used by openvpn3.cpp
 */


#include <iostream>
#include <sstream>
#include <random>
#include <cstring>

#include "common/cmdargparser.hpp"

int cmd_dump_arg_test(ParsedArgs::Ptr args)
{
    std::cout << "===> cmd_dump_arg_test()" << std::endl
              << std::endl;
    ;

    for (auto const &key : args->GetOptionNames())
    {
        std::cout << "[cmd_test1] Argument: " << key << " = [";
        int i = 0;
        for (auto const &val : args->GetAllValues(key))
        {
            if (i > 0)
            {
                std::cout << ", ";
            }
            std::cout << "\"" << val << "\"";
            i++;
        }
        std::cout << "]" << std::endl;
    }
    auto extra = args->GetAllExtraArgs();
    std::cout << "[cmd_test1] Extra argument counts: "
              << extra.size() << std::endl;
    for (auto const &a : args->GetAllExtraArgs())
    {
        std::cout << "[cmd_test1] Extra: " << a << std::endl;
    }
    return 0;
}


int cmd_multiply(ParsedArgs::Ptr args)
{
    std::cout << "===> cmd_multiply() test" << std::endl
              << std::endl;

    if (args->Present("bool-test"))
    {
        std::cout << "Boolean test: "
                  << (args->GetBoolValue("bool-test", 0) ? "true" : "false")
                  << std::endl;
    };

    unsigned long long res = 0;
    std::cout << "Multiplying ... ";
    for (auto const &v : args->GetAllValues("multiply"))
    {
        if (0 == res)
        {
            res = (atol(v.c_str()));
        }
        else
        {
            std::cout << ", ";
            res *= (atol(v.c_str()));
        }
        std::cout << v;
    }
    std::cout << " ... Done" << std::endl;
    std::cout << "Final result: " << std::to_string(res) << std::endl;
    return 0;
}


std::string arghelper_mandatory_arg()
{
    return "'mandatory_string'";
}


std::string arghelper_random_numbers()
{
    std::random_device rd;
    std::mt19937_64 gen(rd());

    std::uniform_int_distribution<unsigned short> distrib;

    std::stringstream res;
    for (int i = 0; i < 5; i++)
    {
        res << std::to_string(distrib(gen)) << " ";
    }
    return res.str();
}


std::string arghelp_boolean()
{
    return "false true";
}


int main(int argc, char **argv)
{
    Commands cmds("Command line parser test",
                  "Simple example and test tool for the command line parser");

    SingleCommand::Ptr test1_cmd;
    test1_cmd.reset(new SingleCommand("test1", "Test command 1", cmd_dump_arg_test));
    test1_cmd->AddComment(SingleCommand::CommentPlacement::BEFORE_OPTS, "Various option parsing tests for the option parser");
    test1_cmd->AddOption("set-value", 's', "key", true, "Set a variable");
    test1_cmd->AddOption("test-func1", "Just testing more options");
    test1_cmd->AddOption("test-func2", 'f', "string", false, "Just another test");
    test1_cmd->AddOption("mandatory-arg", "string", true, "Test mandatory option argument", arghelper_mandatory_arg);
    test1_cmd->AddVersionOption();
    cmds.RegisterCommand(test1_cmd);

    SingleCommand::Ptr test2_cmd;
    test2_cmd.reset(new SingleCommand("test2", "Test command two", cmd_multiply));
    test2_cmd->AddComment(SingleCommand::CommentPlacement::AFTER_OPTS, "These tests and options doesn't really do that much");
    test2_cmd->AddOption("multiply", 'm', "values", true, "Multiply two numbers", arghelper_random_numbers);
    test2_cmd->AddOption("bool-test", 'b', "<true|false>", true, "Test of a boolean option", arghelp_boolean);
    cmds.RegisterCommand(test2_cmd);

    SingleCommand::Ptr test3_cmd;
    test3_cmd.reset(new SingleCommand("test3", "Test command 3", cmd_dump_arg_test));
    test3_cmd->AddComment(SingleCommand::CommentPlacement::BEFORE_OPTS, "Yet more testing, a comment before the option");
    test3_cmd->AddComment(SingleCommand::CommentPlacement::AFTER_OPTS, "And more comments below");
    test3_cmd->AddComment(SingleCommand::CommentPlacement::AFTER_OPTS, "This one even has two lines of comments");
    test3_cmd->AddOption("opt-string", 'o', "string-1", false, "Optional strings");
    cmds.RegisterCommand(test3_cmd);

    try
    {
        return cmds.ProcessCommandLine(argc, argv);
    }
    catch (CommandException &e)
    {
        if (e.gotErrorMessage())
        {
            std::cerr << e.getCommand() << ": ** ERROR ** " << e.what() << std::endl;
        }
    }
}