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/// \file store/backend.hpp
/// Interface to the backend database.

#if !defined(STORE_BACKEND_HPP)
#define STORE_BACKEND_HPP

#include "utils/shared_ptr.hpp"

namespace utils {
namespace fs {
class path;
}  // namespace fs
namespace sqlite {
class database;
}  // namespace sqlite
}  // namespace utils

namespace store {


class metadata;


namespace detail {


extern int current_schema_version;


utils::fs::path migration_file(const int, const int);
utils::fs::path schema_file(void);
metadata initialize(utils::sqlite::database&);
void backup_database(const utils::fs::path&, const int);


}  // anonymous namespace


class transaction;


/// Public interface to the database store.
class backend {
    struct impl;

    /// Pointer to the shared internal implementation.
    std::shared_ptr< impl > _pimpl;

    friend class metadata;

    backend(impl*);

public:
    ~backend(void);

    static backend open_ro(const utils::fs::path&);
    static backend open_rw(const utils::fs::path&);

    utils::sqlite::database& database(void);
    transaction start(void);
};


void migrate_schema(const utils::fs::path&);


}  // namespace store

#endif  // !defined(STORE_BACKEND_HPP)