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/// \file store/read_transaction.hpp
/// Implementation of read-only transactions on the backend.

#if !defined(STORE_READ_TRANSACTION_HPP)
#define STORE_READ_TRANSACTION_HPP

#include "store/read_transaction_fwd.hpp"

extern "C" {
#include <stdint.h>
}

#include <memory>
#include <string>

#include "model/context_fwd.hpp"
#include "model/test_program_fwd.hpp"
#include "model/test_result_fwd.hpp"
#include "store/read_backend_fwd.hpp"
#include "store/read_transaction_fwd.hpp"
#include "utils/datetime_fwd.hpp"

namespace store {


namespace detail {


model::test_program_ptr get_test_program(read_backend&, const int64_t);


}  // namespace detail


/// Iterator for the set of test case results that are part of an action.
///
/// \todo Note that this is not a "standard" C++ iterator.  I have chosen to
/// implement a different interface because it makes things easier to represent
/// an SQL statement state.  Rewrite as a proper C++ iterator, inheriting from
/// std::iterator.
class results_iterator {
    struct impl;

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

    friend class read_transaction;
    results_iterator(std::shared_ptr< impl >);

public:
    ~results_iterator(void);

    results_iterator& operator++(void);
    operator bool(void) const;

    const model::test_program_ptr test_program(void) const;
    std::string test_case_name(void) const;
    model::test_result result(void) const;
    utils::datetime::timestamp start_time(void) const;
    utils::datetime::timestamp end_time(void) const;

    std::string stdout_contents(void) const;
    std::string stderr_contents(void) const;
};


/// Representation of a read-only transaction.
///
/// Transactions are the entry place for high-level calls that access the
/// database.
class read_transaction {
    struct impl;

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

    friend class read_backend;
    read_transaction(read_backend&);

public:
    ~read_transaction(void);

    void finish(void);

    model::context get_context(void);
    results_iterator get_results(void);
};


}  // namespace store

#endif  // !defined(STORE_READ_TRANSACTION_HPP)