"""Tests for DTM module."""

import json
import numpy as np
import pytest
from pathlib import Path
from unittest.mock import patch, MagicMock


class TestSMRFPipeline:
    def test_pipeline_json_valid(self):
        """create_smrf_pipeline produces valid JSON with expected stages."""
        from lidar_pipeline.dtm import create_smrf_pipeline
        result = create_smrf_pipeline("/data/input/test.laz", "/data/output/test_ground.las")
        pipeline = json.loads(result)

        assert "pipeline" in pipeline
        stages = pipeline["pipeline"]

        # Should have: reader, range filter (ReturnNumber), assign, ELM, outlier, SMRF, range filter (Classification), writer
        stage_types = [s.get("type") if isinstance(s, dict) else None for s in stages]

        # First stage is the filename string (reader)
        assert isinstance(stages[0], str)
        assert "test.laz" in stages[0]

        # Must contain preprocessing steps
        assert "filters.assign" in stage_types
        assert "filters.elm" in stage_types
        assert "filters.outlier" in stage_types

        # Must contain SMRF filter
        assert "filters.smrf" in stage_types

        # Must contain ReturnNumber filter
        range_stages = [s for s in stages if isinstance(s, dict) and s.get("type") == "filters.range"]
        assert len(range_stages) >= 1
        # At least one should filter ReturnNumber
        assert any("ReturnNumber" in str(s.get("limits", "")) for s in range_stages)

    def test_pipeline_elm_parameters(self):
        """ELM filter has terrain-adapted parameters."""
        from lidar_pipeline.dtm import create_smrf_pipeline
        result = create_smrf_pipeline("/input/a.laz", "/output/a_ground.las")
        pipeline = json.loads(result)

        elm_stage = [s for s in pipeline["pipeline"] if isinstance(s, dict) and s.get("type") == "filters.elm"][0]
        assert elm_stage["cell"] == 5.0
        assert elm_stage["threshold"] == 2.0

    def test_pipeline_outlier_parameters(self):
        """Outlier filter uses statistical method."""
        from lidar_pipeline.dtm import create_smrf_pipeline
        result = create_smrf_pipeline("/input/a.laz", "/output/a_ground.las")
        pipeline = json.loads(result)

        outlier_stage = [s for s in pipeline["pipeline"] if isinstance(s, dict) and s.get("type") == "filters.outlier"][0]
        assert outlier_stage["method"] == "statistical"
        assert outlier_stage["mean_k"] == 8
        assert outlier_stage["multiplier"] == 3.0

    def test_pipeline_output_path(self):
        """Pipeline output path is set correctly."""
        from lidar_pipeline.dtm import create_smrf_pipeline
        result = create_smrf_pipeline("/input/a.laz", "/output/a_ground.las")
        pipeline = json.loads(result)
        # Last stage should be writer with correct output path
        writer = [s for s in pipeline["pipeline"] if isinstance(s, dict) and s.get("type") == "writers.las"][0]
        assert writer["filename"] == "/output/a_ground.las"


class TestCSFPipeline:
    def test_pipeline_json_valid(self):
        """create_csf_pipeline produces valid JSON with CSF filter."""
        from lidar_pipeline.dtm import create_csf_pipeline
        result = create_csf_pipeline("/data/input/test.laz", "/data/output/test_ground.las")
        pipeline = json.loads(result)

        assert "pipeline" in pipeline
        stages = pipeline["pipeline"]
        stage_types = [s.get("type") if isinstance(s, dict) else None for s in stages]

        # Must contain CSF filter
        assert "filters.csf" in stage_types

        # Must contain ReturnNumber filter
        range_stages = [s for s in stages if isinstance(s, dict) and s.get("type") == "filters.range"]
        assert any("ReturnNumber" in str(s.get("limits", "")) for s in range_stages)

    def test_csf_parameters(self):
        """CSF pipeline has expected parameters."""
        from lidar_pipeline.dtm import create_csf_pipeline
        result = create_csf_pipeline("/input/a.laz", "/output/a_ground.las")
        pipeline = json.loads(result)

        csf_stage = [s for s in pipeline["pipeline"] if isinstance(s, dict) and s.get("type") == "filters.csf"][0]
        assert csf_stage["resolution"] == 1.0  # cloth 1 m : ~4× plus rapide, MNT inchangé
        assert csf_stage["rigidness"] == 3
        assert csf_stage["smooth"] is True
        assert "hdiff" not in csf_stage  # hdiff is not a valid PDAL CSF parameter


class TestInterpolateHoles:
    def test_fills_interior_hole_with_surface(self):
        """Large interior NaN hole is filled (no NaN left, value is plausible)."""
        from lidar_pipeline.dtm import _interpolate_holes
        # Linear-in-column surface z = 0.02 * x, with a large square hole in the middle.
        x = np.arange(40, dtype=float) * 0.02
        dtm = np.tile(x, (40, 1))
        dtm[16:24, 16:24] = np.nan
        filled, count = _interpolate_holes(dtm)
        assert count == 64
        assert not np.isnan(filled).any()
        # Filled values stay within the surrounding z range (no wild extrapolation).
        zmin, zmax = np.nanmin(dtm), np.nanmax(dtm)
        hole_vals = filled[16:24, 16:24]
        assert np.all(hole_vals >= zmin - 1e-6)
        assert np.all(hole_vals <= zmax + 1e-6)
        # A linear surface is interpolated near-exactly in the interior.
        expected = np.tile(x[16:24], (8, 1))
        assert np.allclose(hole_vals, expected, atol=0.02)
        # Original valid cells are untouched.
        valid = ~np.isnan(dtm)
        assert np.allclose(filled[valid], dtm[valid])

    def test_no_holes_returns_unchanged(self):
        """No NaN → returns same array and zero count."""
        from lidar_pipeline.dtm import _interpolate_holes
        dtm = np.arange(64, dtype=float).reshape(8, 8)
        filled, count = _interpolate_holes(dtm)
        assert count == 0
        assert np.shares_memory(filled, dtm)

    def test_all_nan_returns_unchanged(self):
        """No valid data → cannot interpolate, returns zeros-free NaN array."""
        from lidar_pipeline.dtm import _interpolate_holes
        dtm = np.full((8, 8), np.nan)
        filled, count = _interpolate_holes(dtm)
        assert count == 0
        assert np.isnan(filled).all()


class TestMinReturnGrid:
    def test_takes_lowest_return_per_cell(self, tmp_output_dir):
        """_min_return_grid rasterise le point le plus bas par cellule (pas la moyenne)."""
        import laspy
        from lidar_pipeline.dtm import _min_return_grid
        out = tmp_output_dir / "pts.las"
        hdr = laspy.LasHeader(version='1.2', point_format=0)
        las = laspy.LasData(hdr)
        # Grille 2x2 sur [0,2]x[0,2]. La cellule (0,0) porte deux points z=5 et
        # z=2 (min=2, moyenne=3.5) ; (1,0) z=3 ; (0,1) z=4 ; (1,1) vide.
        las.x = [0.2, 0.5, 1.2, 0.3]
        las.y = [0.2, 0.3, 0.4, 1.5]
        las.z = [5.0, 2.0, 3.0, 4.0]
        las.write(str(out))

        grid = _min_return_grid(out, 2, 2, (0.0, 0.0, 2.0, 2.0))
        assert grid.shape == (2, 2)
        assert int(np.isnan(grid).sum()) == 1
        # Une seule valeur par cellule, et la cellule (0,0) vaut le MIN (2.0).
        vals = sorted(float(v) for v in grid[~np.isnan(grid)])
        assert vals == [2.0, 3.0, 4.0]
        assert 3.5 not in vals


class TestBareEarth:
    """Le plancher « sol nu » ramène le DTM au retour le plus bas de chaque cellule."""

    def _write_las(self, path, points):
        """points: list of (x, y, z). Écrit un LAS 1.2 format 0 aux bornes [0,2]x[0,2]."""
        import laspy
        hdr = laspy.LasHeader(version='1.2', point_format=0)
        las = laspy.LasData(hdr)
        las.x = [p[0] for p in points]
        las.y = [p[1] for p in points]
        las.z = [p[2] for p in points]
        las.write(str(path))
        return path

    def _make_clouds(self, tmp_output_dir):
        """Grille 2x2 (res=1.0). Les points « coin » à 0.05/1.95 imposent l'étendue
        [0.05,1.95] (laspy re-déduit les bornes de l'en-tête depuis les points).
        Le sol (las_file) vaut z=10 partout. Le nuage complet (source_laz) a un
        retour plus bas dans les cellules (0,0) -> 2 et (1,0) -> 5 ; les deux autres
        cellules n'ont que z=10."""
        ground = [(0.5, 0.5, 10.0), (1.5, 0.5, 10.0), (0.5, 1.5, 10.0), (1.5, 1.5, 10.0),
                  (0.05, 0.05, 10.0), (1.95, 1.95, 10.0)]
        source = list(ground) + [(0.3, 0.3, 2.0), (1.3, 0.3, 5.0)]
        las_file = self._write_las(tmp_output_dir / "ground.las", ground)
        source_laz = self._write_las(tmp_output_dir / "source.las", source)
        return las_file, source_laz

    def _dtm_values(self, tmp_output_dir, bare_earth):
        from lidar_pipeline.dtm import create_dtm_fast
        import rasterio
        las_file, source_laz = self._make_clouds(tmp_output_dir)
        out = create_dtm_fast(las_file, "tile", tmp_output_dir, 1.0,
                              force=True, source_laz=source_laz, bare_earth=bare_earth)
        assert out is not None
        with rasterio.open(str(out)) as src:
            arr = src.read(1).astype("float64")
        return arr[~np.isnan(arr)]

    def test_bare_earth_pulls_dtm_to_lowest_return(self, tmp_output_dir):
        """Avec bare_earth, le DTM descend aux retours les plus bas (2 et 5)."""
        vals = sorted(float(v) for v in self._dtm_values(tmp_output_dir, bare_earth=True))
        # Les cellules sans retour plus bas restent à 10 ; les deux autres descendent.
        assert vals == [2.0, 5.0, 10.0, 10.0]
        assert vals[0] == 2.0 and vals[1] == 5.0

    def test_no_bare_earth_keeps_mean(self, tmp_output_dir):
        """Sans bare_earth, le DTM garde la moyenne des points sol (10 partout)."""
        vals = sorted(float(v) for v in self._dtm_values(tmp_output_dir, bare_earth=False))
        assert all(v == 10.0 for v in vals)


class TestDetectGroundMethod:
    def _make_mock_las(self, num_returns, z_values):
        """Create a mock laspy object with specified NumberOfReturns and z."""
        mock_las = MagicMock()
        mock_las.NumberOfReturns = np.array(num_returns)
        mock_las.z = np.array(z_values)
        mock_las.points = MagicMock()
        mock_las.points.__len__ = lambda self: len(num_returns)
        return mock_las

    @patch('lidar_pipeline.dtm._read_with_pdal')
    @patch('laspy.read')
    def test_urban_terrain_returns_csf(self, mock_read, mock_pdal):
        """High single-return ratio (>0.6) should select CSF."""
        from lidar_pipeline.dtm import detect_ground_method

        # 70% single returns = urban
        n = 10000
        num_returns = np.ones(n, dtype=int)
        num_returns[:int(n * 0.3)] = 2  # 30% multi-return
        z_values = np.random.normal(100, 5, n)  # Low variance = flat terrain

        mock_read.return_value = self._make_mock_las(num_returns, z_values)

        result = detect_ground_method(Path("/data/input/test.laz"))
        assert result == 'csf'

    @patch('lidar_pipeline.dtm._read_with_pdal')
    @patch('laspy.read')
    def test_natural_terrain_returns_smrf(self, mock_read, mock_pdal):
        """Low single-return ratio and moderate variance should select SMRF."""
        from lidar_pipeline.dtm import detect_ground_method

        # 40% single returns, moderate variance
        n = 10000
        num_returns = np.ones(n, dtype=int)
        num_returns[:int(n * 0.6)] = 2  # 60% multi-return (forest)
        z_values = np.random.normal(100, 15, n)  # Moderate variance

        mock_read.return_value = self._make_mock_las(num_returns, z_values)

        result = detect_ground_method(Path("/data/input/test.laz"))
        assert result == 'smrf'

    @patch('lidar_pipeline.dtm._read_with_pdal')
    @patch('laspy.read')
    def test_mountainous_terrain_returns_csf(self, mock_read, mock_pdal):
        """High variance terrain (>30m std) selects CSF for complex terrain."""
        from lidar_pipeline.dtm import detect_ground_method

        # Moderate single-return ratio but very high height variance
        n = 10000
        num_returns = np.ones(n, dtype=int)
        num_returns[:int(n * 0.5)] = 2
        z_values = np.random.normal(100, 50, n)  # Very high variance = mountainous

        mock_read.return_value = self._make_mock_las(num_returns, z_values)

        result = detect_ground_method(Path("/data/input/test.laz"))
        assert result == 'csf'


class TestIGNPipeline:
    def test_pipeline_keeps_supplier_classification(self):
        """create_ign_pipeline réutilise la pré-classification (classe 2) sans refiltrer."""
        from lidar_pipeline.dtm import create_ign_pipeline
        result = create_ign_pipeline("/input/a.laz", "/output/a_ground.las")
        pipeline = json.loads(result)

        stages = pipeline["pipeline"]
        stage_types = [s.get("type") if isinstance(s, dict) else None for s in stages]

        # Aucun algorithme de classification, pas de remise à zéro, pas de filtres de bruit
        assert "filters.smrf" not in stage_types
        assert "filters.csf" not in stage_types
        assert "filters.assign" not in stage_types
        assert "filters.elm" not in stage_types
        assert "filters.outlier" not in stage_types

        # Filtre ReturnNumber conservé + extraction des points classe 2
        range_stages = [s for s in stages if isinstance(s, dict) and s.get("type") == "filters.range"]
        assert any("ReturnNumber" in str(s.get("limits", "")) for s in range_stages)
        assert any(s.get("limits") == "Classification[2:2]" for s in range_stages)

        writer = [s for s in stages if isinstance(s, dict) and s.get("type") == "writers.las"][0]
        assert writer["filename"] == "/output/a_ground.las"


class TestDetectIGN:
    def _make_mock_las(self, classification, num_returns, z_values):
        mock_las = MagicMock()
        mock_las.classification = classification
        mock_las.NumberOfReturns = np.array(num_returns)
        mock_las.z = np.array(z_values)
        mock_las.points = MagicMock()
        mock_las.points.__len__ = lambda self: len(num_returns)
        return mock_las

    @patch('lidar_pipeline.dtm._read_with_pdal')
    @patch('laspy.read')
    def test_preclassified_returns_ign(self, mock_read, mock_pdal):
        """Fichier pré-classifié (majorité classe 2) → méthode IGN."""
        from lidar_pipeline.dtm import detect_ground_method

        n = 10000
        num_returns = np.ones(n, dtype=int)
        cls = np.zeros(n, dtype=np.uint8)
        cls[int(n * 0.15):] = 2  # 85 % de points classe 2
        z_values = np.random.normal(100, 5, n)

        mock_read.return_value = self._make_mock_las(cls, num_returns, z_values)
        assert detect_ground_method(Path("/data/input/test.laz")) == 'ign'

    @patch('lidar_pipeline.dtm._read_with_pdal')
    @patch('laspy.read')
    def test_unclassified_falls_back_to_smrf_or_csf(self, mock_read, mock_pdal):
        """Sans classification exploitable → détection SMRF/CSF classique."""
        from lidar_pipeline.dtm import detect_ground_method

        n = 10000
        num_returns = np.ones(n, dtype=int)
        num_returns[:int(n * 0.6)] = 2  # 60 % multi-retours (forêt) → non urbain
        cls = np.zeros(n, dtype=np.uint8)  # aucun point classe 2
        z_values = np.random.normal(100, 5, n)

        mock_read.return_value = self._make_mock_las(cls, num_returns, z_values)
        assert detect_ground_method(Path("/data/input/test.laz")) == 'smrf'


class TestClassifyGroundMethod:
    @patch('lidar_pipeline.dtm.subprocess')
    def test_classify_ground_auto_calls_detect(self, mock_subprocess):
        """classify_ground with method='auto' should call detect_ground_method."""
        from lidar_pipeline.dtm import classify_ground

        # Mock detect_ground_method to return 'csf'
        with patch('lidar_pipeline.dtm.detect_ground_method', return_value='csf') as mock_detect:
            mock_subprocess.run.return_value = MagicMock(returncode=0)
            result = classify_ground(Path("/data/input/test.laz"), Path("/tmp"), method='auto')

            mock_detect.assert_called_once()

    @patch('lidar_pipeline.dtm.subprocess')
    def test_classify_ground_smrf_uses_smrf_pipeline(self, mock_subprocess):
        """classify_ground with method='smrf' should create SMRF pipeline."""
        from lidar_pipeline.dtm import classify_ground, _create_ground_pipeline

        mock_subprocess.run.return_value = MagicMock(returncode=0)

        with patch('lidar_pipeline.dtm.detect_ground_method'):
            # Create temp dir
            import tempfile
            with tempfile.TemporaryDirectory() as tmpdir:
                result = classify_ground(Path("/data/input/test.laz"), Path(tmpdir), method='smrf')

                # Check the pipeline JSON was written with SMRF
                pipeline_file = Path(tmpdir) / "pipeline_smrf.json"
                if pipeline_file.exists():
                    pipeline = json.loads(pipeline_file.read_text())
                    stage_types = [s.get("type") if isinstance(s, dict) else None for s in pipeline["pipeline"]]
                    assert "filters.smrf" in stage_types

    @patch('lidar_pipeline.dtm.subprocess')
    def test_classify_ground_csf_uses_csf_pipeline(self, mock_subprocess):
        """classify_ground with method='csf' should create CSF pipeline."""
        from lidar_pipeline.dtm import classify_ground

        mock_subprocess.run.return_value = MagicMock(returncode=0)

        with patch('lidar_pipeline.dtm.detect_ground_method'):
            import tempfile
            with tempfile.TemporaryDirectory() as tmpdir:
                result = classify_ground(Path("/data/input/test.laz"), Path(tmpdir), method='csf')

                pipeline_file = Path(tmpdir) / "pipeline_csf.json"
                if pipeline_file.exists():
                    pipeline = json.loads(pipeline_file.read_text())
                    stage_types = [s.get("type") if isinstance(s, dict) else None for s in pipeline["pipeline"]]
                    assert "filters.csf" in stage_types

class TestParseIgnClasses:
    def test_default_sol(self):
        """'sol' → code 2 seul."""
        from lidar_pipeline.dtm import parse_ign_classes
        assert parse_ign_classes("sol") == [2]

    def test_names_sorted_dedup(self):
        """Noms acceptés (EN/FR), triés et dédupliqués."""
        from lidar_pipeline.dtm import parse_ign_classes
        assert parse_ign_classes("sol,unclassified") == [1, 2]
        assert parse_ign_classes("unclassified,sol") == [1, 2]
        assert parse_ign_classes("non-classe") == [1]
        assert parse_ign_classes("sol,2") == [2]

    def test_numeric_codes(self):
        """Codes LAS directs, triés."""
        from lidar_pipeline.dtm import parse_ign_classes
        assert parse_ign_classes("2,1") == [1, 2]
        assert parse_ign_classes("66") == [66]

    def test_invalid_raises(self):
        """Nom inconnu, code hors bornes ou liste vide → ValueError."""
        from lidar_pipeline.dtm import parse_ign_classes
        with pytest.raises(ValueError):
            parse_ign_classes("foo")
        with pytest.raises(ValueError):
            parse_ign_classes("300")
        with pytest.raises(ValueError):
            parse_ign_classes("")

    def test_method_label(self):
        """'ign' seul pour le sol, combinaison encodée sinon (invalidation cache)."""
        from lidar_pipeline.dtm import ign_method_label
        assert ign_method_label([2]) == "ign"
        assert ign_method_label([1, 2]) == "ign_1_2"
        assert ign_method_label([2, 1]) == "ign_1_2"


class TestIGNPipelineMultiClasses:
    def test_multi_class_limits(self):
        """Plusieurs classes → plages OU logiques sur Classification."""
        from lidar_pipeline.dtm import _create_ground_pipeline
        result = _create_ground_pipeline("/input/a.laz", "/output/a_ground.las",
                                         'ign', ign_codes=[1, 2])
        pipeline = json.loads(result)
        range_stages = [s for s in pipeline["pipeline"]
                        if isinstance(s, dict) and s.get("type") == "filters.range"]
        limits = [str(s.get("limits", "")) for s in range_stages]
        assert any("Classification[1:1]" in l and "Classification[2:2]" in l
                   for l in limits)

    def test_default_sol_only(self):
        """Sans ign_codes, la voie IGN reste sol seul (2) — rétrocompatible."""
        from lidar_pipeline.dtm import _create_ground_pipeline
        result = _create_ground_pipeline("/input/a.laz", "/output/a_ground.las", 'ign')
        pipeline = json.loads(result)
        range_stages = [s for s in pipeline["pipeline"]
                        if isinstance(s, dict) and s.get("type") == "filters.range"]
        limits = [str(s.get("limits", "")) for s in range_stages]
        assert any("Classification[2:2]" in l and "Classification[1:1]" not in l
                   for l in limits)


class TestClassifyGroundIgnClasses:
    @patch('lidar_pipeline.dtm.subprocess')
    def test_ign_classes_encoded_in_filenames(self, mock_subprocess):
        """--ign-classes sol,unclassified → fichiers ign_1_2 + filtre multi-classes."""
        import tempfile
        from lidar_pipeline.dtm import classify_ground

        mock_subprocess.run.return_value = MagicMock(returncode=0)

        with tempfile.TemporaryDirectory() as tmpdir:
            tmpdir = Path(tmpdir)
            classify_ground(Path("/data/input/test.laz"), tmpdir,
                            method='ign', ign_classes="sol,unclassified")

            pipeline_file = tmpdir / "pipeline_ign_1_2.json"
            assert pipeline_file.exists()
            pipeline = json.loads(pipeline_file.read_text())
            limits = [str(s.get("limits", "")) for s in pipeline["pipeline"]
                      if isinstance(s, dict) and s.get("type") == "filters.range"]
            assert any("Classification[1:1]" in l and "Classification[2:2]" in l
                       for l in limits)

    @patch('lidar_pipeline.dtm.subprocess')
    def test_ign_default_label_unchanged(self, mock_subprocess):
        """--ign-classes sol (défaut) → noms 'ign' inchangés (cache préservé)."""
        import tempfile
        from lidar_pipeline.dtm import classify_ground

        mock_subprocess.run.return_value = MagicMock(returncode=0)

        with tempfile.TemporaryDirectory() as tmpdir:
            tmpdir = Path(tmpdir)
            classify_ground(Path("/data/input/test.laz"), tmpdir, method='ign')

            assert (tmpdir / "pipeline_ign.json").exists()
            assert not (tmpdir / "pipeline_ign_1_2.json").exists()


class TestPureDtm:
    """Mode pur (classification IGN) : aucune retouche, trous en nodata."""

    def _write_las(self, path, points):
        import laspy
        hdr = laspy.LasHeader(version='1.2', point_format=0)
        las = laspy.LasData(hdr)
        las.x = [p[0] for p in points]
        las.y = [p[1] for p in points]
        las.z = [p[2] for p in points]
        las.write(str(path))
        return path

    def _make_clouds(self, tmp_output_dir):
        """Grille 2x2 (res=1.0). Sol sur 3 cellules (z=10), trou en (1,1).
        Le nuage complet a un retour plus bas (z=7) dans le trou."""
        corners = [(0.05, 0.05, 10.0), (1.95, 0.05, 10.0), (0.05, 1.95, 10.0)]
        ground = [(0.5, 0.5, 10.0), (1.5, 0.5, 10.0), (0.5, 1.5, 10.0)] + corners
        source = list(ground) + [(1.5, 1.5, 7.0)]
        las_file = self._write_las(tmp_output_dir / "ground_pure.las", ground)
        source_laz = self._write_las(tmp_output_dir / "source_pure.las", source)
        return las_file, source_laz

    def _dtm_array(self, tmp_output_dir, pure):
        from lidar_pipeline.dtm import create_dtm_fast
        import rasterio
        las_file, source_laz = self._make_clouds(tmp_output_dir)
        out = create_dtm_fast(las_file, "tile_pure", tmp_output_dir, 1.0,
                              force=True, source_laz=source_laz, pure=pure)
        assert out is not None
        with rasterio.open(str(out)) as src:
            return src.read(1).astype("float64")

    def test_pure_fills_holes_without_floor(self, tmp_output_dir):
        """pur=True : trous comblés par interpolation, sans plancher à 7.

        Le comblement est actif dans tous les modes (comportement
        historique) ; « pur » ne désactive que l'abaissement au retour
        le plus bas.
        """
        arr = self._dtm_array(tmp_output_dir, pure=True)
        assert int(np.isnan(arr).sum()) == 0
        vals = sorted(float(v) for v in arr.flatten())
        assert vals == [10.0, 10.0, 10.0, 10.0]

    def test_not_pure_fills_holes(self, tmp_output_dir):
        """pur=False : le trou est comblé (comportement historique conservé)."""
        arr = self._dtm_array(tmp_output_dir, pure=False)
        assert int(np.isnan(arr).sum()) == 0
        vals = sorted(float(v) for v in arr.flatten())
        assert len(vals) == 4
        assert vals[-1] == 10.0