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/// \file engine/scanner.hpp
/// Utilities to scan through list of tests in a test suite.

#if !defined(ENGINE_SCANNER_HPP)
#define ENGINE_SCANNER_HPP

#include "engine/scanner_fwd.hpp"

#include <memory>
#include <set>

#include "engine/filters_fwd.hpp"
#include "model/test_program_fwd.hpp"
#include "utils/optional_fwd.hpp"
#include "utils/shared_ptr.hpp"

namespace engine {


/// Scans a list of test programs, yielding one test case at a time.
///
/// This class contains the state necessary to process a collection of test
/// programs (possibly as provided by the Kyuafile) and to extract an arbitrary
/// (test program, test_case) pair out of them one at a time.
///
/// The scanning algorithm guarantees that test programs are initialized
/// dynamically, should they need to load their list of test cases from disk.
///
/// The order of the extraction is not guaranteed.
class scanner {
    struct impl;
    /// Pointer to the internal implementation data.
    std::shared_ptr< impl > _pimpl;

public:
    scanner(const model::test_programs_vector&, const std::set< test_filter >&);
    ~scanner(void);

    bool done(void);
    utils::optional< scan_result > yield(void);

    std::set< test_filter > unused_filters(void) const;
};


}  // namespace engine


#endif  // !defined(ENGINE_SCANNER_HPP)