//
// test suite for c-api GEOSLineSubstring

#include <tut/tut.hpp>
// geos
#include <geos_c.h>
// std
#include <cstdarg>
#include <cstdio>

#include "capi_test_utils.h"

namespace tut {
//
// test group
//

// common data used in test cases.
struct test_capigeoslinesubstring_data : public capitest::utility {
};

typedef test_group<test_capigeoslinesubstring_data> group;
typedef group::object object;

group test_capigeoslinesubstring_group("capi::GEOSLineSubstring");

//
// test cases
//

// basic LineString input
template<>
template<>
void object::test<1>
()
{
    input_ = GEOSGeomFromWKT("LINESTRING (0 0, 2 2)");
    result_ = GEOSLineSubstring(input_, 0, 0.5);
    expected_ = GEOSGeomFromWKT("LINESTRING (0 0, 1 1)");

    ensure_geometry_equals(result_, expected_);
}

// MultiLineString also accepted
template<>
template<>
void object::test<2>
()
{
    input_ = GEOSGeomFromWKT("MULTILINESTRING((0 0, 0 100),(0 -5, 0 0))");
    result_ = GEOSLineSubstring(input_, 0.5, 1);
    expected_ = GEOSGeomFromWKT("MULTILINESTRING ((0 52.5, 0 100), (0 -5, 0 0))");

    ensure_geometry_equals(result_, expected_);
}

// collapse returns zero-length linestring
template<>
template<>
void object::test<3>
()
{
    input_ = GEOSGeomFromWKT("LINESTRING (0 0, 2 2)");
    result_ = GEOSLineSubstring(input_, 0.5, 0.5);
    expected_ = GEOSGeomFromWKT("LINESTRING (1 1, 1 1)");

    ensure_geometry_equals(result_, expected_);
}

// fractions out of range throw an error
template<>
template<>
void object::test<4>
()
{
    input_ = GEOSGeomFromWKT("LINESTRING (0 0, 2 2)");

    result_ = GEOSLineSubstring(input_, 0.5, 1.5);
    ensure(result_ == nullptr);

    result_ = GEOSLineSubstring(input_, 0.5, -0.1);
    ensure(result_ == nullptr);
}

// Z dimension is interpolated
template<>
template<>
void object::test<5>
()
{
    input_ = GEOSGeomFromWKT("LINESTRINGZ (0 0 0, 2 2 5)");
    result_ = GEOSLineSubstring(input_, 0, 0.5);
    expected_ = GEOSGeomFromWKT("LINESTRING (0 0 0, 1 1 2.5)");

    ensure_geometry_equals(result_, expected_);

    // check 3rd dimension that isgnored by ensure_geometry_equals
    ensure(GEOSHasZ(result_));
    auto seq = GEOSGeom_getCoordSeq(expected_);

    double z0, z1;
    GEOSCoordSeq_getZ(seq, 0, &z0);
    GEOSCoordSeq_getZ(seq, 1, &z1);

    ensure_equals(z0, 0);
    ensure_equals(z1, 2.5);
}

// reversed fractions give a reversed substring
template<>
template<>
void object::test<6>
()
{
    input_ = GEOSGeomFromWKT("LINESTRING (0 0, 1 1)");
    result_ = GEOSLineSubstring(input_, 0.5, 0);
    expected_ = GEOSGeomFromWKT("LINESTRING(0.5 0.5, 0 0)");

    ensure_geometry_equals(result_, expected_);
}


} // namespace tut