#include <iostream>
#include <cstring>
#include <memory>
#include <vector>
#include "package.h"

namespace katja
{
    class command
    {
    public:
        virtual void execute() const = 0;
    };

    class list final : public command
    {
    public:
        void execute() const override;
    };

    class help final : public command
    {
    public:
        void execute() const override;
    };

    enum class command_exception_t
    {
        no_command,
        too_many_arguments,
        unknown_command,
    };

    class command_exception final : public std::exception
    {
        command_exception_t m_exception_type;
        std::vector<std::string> m_failed_arguments;

    public:
        explicit command_exception(const command_exception_t exception_type,
            std::vector<std::string> failed_arguments = {}) noexcept;

        const char *what() const noexcept override;
        const std::vector<std::string>& failed_arguments() const noexcept;
    };

    std::unique_ptr<command> parse_command_line(int argc, char **argv);
}