#pragma once

#include <string>
#include <optional>
#include <unordered_map>
#include <set>
#include <forward_list>

namespace katja
{
    class package
    {
        std::string m_name;
        std::string m_version;
        std::string m_architecture;
        std::string m_tag;

    public:
        explicit package(const std::string& name, const std::string& version,
            const std::string& architecture, const std::string& tag);

        const std::string& name() const noexcept;
        const std::string& version() const noexcept;
        const std::string& architecture() const noexcept;
        const std::string& tag() const noexcept;

        static std::optional<package> parse(const std::string& full_name) noexcept;
    };

    class repository
    {
    public:
        virtual std::unordered_map<std::string, package> list(const std::set<std::string>& package_names) = 0;
        virtual void refresh() = 0;
        virtual std::forward_list<std::string> check_dependencies(const std::string& package_name) = 0;
    };

    std::unordered_map<std::string, package> read_package_database();

    class package_exception : public std::exception
    {
        std::string m_message;

    public:
        explicit package_exception(const std::string& package_name, const std::string& reason) noexcept;

        const std::string_view package_name() const noexcept;
        const char *what() const noexcept override;
    };
}