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/*! \internal \file
 * \brief
 * Tests for functionality of the "distance" trajectory analysis module.
 *
 * \author Teemu Murtola <teemu.murtola@gmail.com>
 * \ingroup module_trajectoryanalysis
 */
#include "gmxpre.h"

#include "gromacs/trajectoryanalysis/modules/distance.h"

#include <gtest/gtest.h>

#include "testutils/cmdlinetest.h"

#include "moduletest.h"

namespace
{

using gmx::test::CommandLine;

/********************************************************************
 * Tests for gmx::analysismodules::Distance.
 */

//! Test fixture for the angle analysis module.
typedef gmx::test::TrajectoryAnalysisModuleTestFixture<gmx::analysismodules::DistanceInfo> DistanceModuleTest;

TEST_F(DistanceModuleTest, ComputesDistances)
{
    const char* const cmdline[] = { "distance", "-select", "atomname S1 S2", "-len", "2",
                                    "-binw",    "0.5" };
    setTopology("simple.gro");
    runTest(CommandLine(cmdline));
}

TEST_F(DistanceModuleTest, ComputesMultipleDistances)
{
    const char* const cmdline[] = {
        "distance",       "-select",
        "atomname S1 S2", "resindex 1 to 4 and atomname CB merge resindex 2 to 5 and atomname CB",
        "-len",           "2",
        "-binw",          "0.5"
    };
    setTopology("simple.gro");
    runTest(CommandLine(cmdline));
}

TEST_F(DistanceModuleTest, HandlesDynamicSelections)
{
    const char* const cmdline[] = { "distance", "-select", "atomname S1 S2 and res_cog x < 2.8",
                                    "-len",     "2",       "-binw",
                                    "0.5" };
    setTopology("simple.gro");
    runTest(CommandLine(cmdline));
}

TEST_F(DistanceModuleTest, HandlesSelectionFromGroup)
{
    const char* const cmdline[] = { "distance", "-select", "group \"Contacts\"" };
    setInputFile("-n", "simple.ndx");
    setTopology("simple.gro");
    runTest(CommandLine(cmdline));
}

TEST_F(DistanceModuleTest, HandlesSelectionFromGroupWithSuccessiveIndices)
{
    // Ensure that the presence of repeated indices like "1 2 2 3" works
    const char* const cmdline[] = { "distance", "-select", "group \"SuccessiveContacts\"" };
    setInputFile("-n", "simple.ndx");
    setTopology("simple.gro");
    runTest(CommandLine(cmdline));
}

TEST_F(DistanceModuleTest, HandlesSelectionFromLargeGroup)
{
    const char* const cmdline[] = { "distance", "-select", "group \"ManyContacts\"" };
    setInputFile("-n", "simple.ndx");
    setTopology("simple.gro");
    runTest(CommandLine(cmdline));
}

} // namespace
