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/*! \internal \file
 * \brief
 * Declares test fixture for TrajectoryAnalysisModule subclasses.
 *
 * \author Teemu Murtola <teemu.murtola@gmail.com>
 * \ingroup module_trajectoryanalysis
 */
#ifndef GMX_TRAJECTORYANALYSIS_TESTS_MODULETEST_H
#define GMX_TRAJECTORYANALYSIS_TESTS_MODULETEST_H

#include <memory>

#include <gtest/gtest.h>

#include "gromacs/trajectoryanalysis/analysismodule.h"

#include "testutils/cmdlinetest.h"

namespace gmx
{

class TrajectoryAnalysisModule;

namespace test
{

class FloatingPointTolerance;

/*! \internal
 * \brief
 * Test fixture for trajectory analysis modules.
 *
 * This class implements common logic for all tests for trajectory analysis
 * modules.  The tests simply need to specify the type of the module to test,
 * input files and any additional options, names of datasets to test (if not
 * all), and possible output files to explicitly test by calling the different
 * methods in this class.  runTest() then runs the specified module with the
 * given options and performs all the requested tests against reference data.
 *
 * Tests should prefer to test the underlying data sets instead of string
 * comparison on the output files using setOutputFile().
 *
 * The actual module to be tested is constructed in the pure virtual
 * createModule() method, which should be implemented in a subclass.
 * Typically, the TrajectoryAnalysisModuleTestFixture template can be used.
 *
 * Any method in this class may throw std::bad_alloc if out of memory.
 *
 * \todo
 * Adding facilities to AnalysisData to check whether there are any
 * output modules attached to the data object (directly or indirectly),
 * marking the mocks as output modules, and using these checks in the
 * tools instead of or in addition to the output file presence would be
 * a superior.
 * Also, the full file names should be deducible from the options.
 *
 * \ingroup module_trajectoryanalysis
 */
class AbstractTrajectoryAnalysisModuleTestFixture : public CommandLineTestBase
{
public:
    AbstractTrajectoryAnalysisModuleTestFixture();
    ~AbstractTrajectoryAnalysisModuleTestFixture() override;

    /*! \brief
     * Sets the topology file to use for the test.
     *
     * \param[in] filename  Name of input topology file.
     *
     * \p filename is interpreted relative to the test input data
     * directory, see getTestDataPath().
     *
     * Must be called at most once.  Either this method or setTrajectory()
     * must be called before runTest().
     */
    void setTopology(const char* filename);
    /*! \brief
     * Sets the trajectory file to use for the test.
     *
     * \param[in] filename  Name of input trajectory file.
     *
     * \p filename is interpreted relative to the test input data
     * directory, see getTestDataPath().
     *
     * Must be called at most once.  Either this method or setTopology()
     * must be called before runTest().
     */
    void setTrajectory(const char* filename);
    /*! \brief
     * Includes only specified dataset for the test.
     *
     * \param[in] name  Name of dataset to include.
     *
     * If this method is not called, all datasets are tested by default.
     * If called once, only the specified dataset is tested.
     * If called more than once, also the additional datasets are tested.
     *
     * \p name should be one of the names registered for the tested module
     * using TrajectoryAnalysisModule::registerBasicDataset() or
     * TrajectoryAnalysisModule::registerAnalysisDataset().
     */
    void includeDataset(const char* name);
    /*! \brief
     * Excludes specified dataset from the test.
     *
     * \param[in] name  Name of dataset to exclude.
     *
     * \p name should be one of the names registered for the tested module
     * using TrajectoryAnalysisModule::registerBasicDataset() or
     * TrajectoryAnalysisModule::registerAnalysisDataset().
     */
    void excludeDataset(const char* name);
    /*! \brief
     * Sets a custom tolerance for checking a dataset.
     *
     * \param[in] name       Name of dataset to set the tolerance for.
     * \param[in] tolerance  Tolerance used when verifying the data.
     *
     * \p name should be one of the names registered for the tested module
     * using TrajectoryAnalysisModule::registerBasicDataset() or
     * TrajectoryAnalysisModule::registerAnalysisDataset().
     */
    void setDatasetTolerance(const char* name, const FloatingPointTolerance& tolerance);

    /*! \brief
     * Runs the analysis module with the given additional options.
     *
     * \param[in] args  Options to provide to the module.
     *
     * \p args should be formatted as command-line options, and contain the
     * name of the module as the first argument (the latter requirement is
     * for clarity only).  They are passed to the module in addition to
     * those specified using other methods in this class.
     *
     * All other methods should be called before calling this method.
     *
     * Exceptions thrown by the module are caught by this method.
     */
    void runTest(const CommandLine& args);

protected:
    /*! \brief
     * Constructs the analysis module to be tested.
     */
    virtual TrajectoryAnalysisModulePointer createModule() = 0;

private:
    class Impl;

    std::unique_ptr<Impl> impl_;
};

/*! \internal \brief
 * Test fixture for a trajectory analysis module.
 *
 * \tparam ModuleInfo  Info object for the analysis module to test.
 *
 * \p ModuleInfo should provide a static
 * `TrajectoryAnalysisModulePointer create()` method.
 *
 * \ingroup module_trajectoryanalysis
 */
template<class ModuleInfo>
class TrajectoryAnalysisModuleTestFixture : public AbstractTrajectoryAnalysisModuleTestFixture
{
protected:
    TrajectoryAnalysisModulePointer createModule() override { return ModuleInfo::create(); }
};

} // namespace test
} // namespace gmx

#endif
