from copy import deepcopy
import string
from fontTools.colorLib.builder import LayerListBuilder, buildClipList
from fontTools.misc.testTools import getXML
from fontTools.varLib.merger import COLRVariationMerger
from fontTools.varLib.models import VariationModel
from fontTools.ttLib import TTFont
from fontTools.ttLib.tables import otTables as ot
from fontTools.ttLib.tables.otBase import OTTableReader, OTTableWriter
import pytest


NO_VARIATION_INDEX = ot.NO_VARIATION_INDEX


def dump_xml(table, ttFont=None):
    xml = getXML(table.toXML, ttFont)
    print("[")
    for line in xml:
        print(f"  {line!r},")
    print("]")
    return xml


def compile_decompile(table, ttFont):
    writer = OTTableWriter(tableTag="COLR")
    table.compile(writer, ttFont)
    data = writer.getAllData()

    reader = OTTableReader(data, tableTag="COLR")
    table2 = table.__class__()
    table2.decompile(reader, ttFont)

    return table2


@pytest.fixture
def ttFont():
    font = TTFont()
    font.setGlyphOrder([".notdef"] + list(string.ascii_letters))
    return font


def build_paint(data):
    return LayerListBuilder().buildPaint(data)


class COLRVariationMergerTest:
    @pytest.mark.parametrize(
        "paints, expected_xml, expected_varIdxes",
        [
            pytest.param(
                [
                    {
                        "Format": int(ot.PaintFormat.PaintSolid),
                        "PaletteIndex": 0,
                        "Alpha": 1.0,
                    },
                    {
                        "Format": int(ot.PaintFormat.PaintSolid),
                        "PaletteIndex": 0,
                        "Alpha": 1.0,
                    },
                ],
                [
                    '<Paint Format="2"><!-- PaintSolid -->',
                    '  <PaletteIndex value="0"/>',
                    '  <Alpha value="1.0"/>',
                    "</Paint>",
                ],
                [],
                id="solid-same",
            ),
            pytest.param(
                [
                    {
                        "Format": int(ot.PaintFormat.PaintSolid),
                        "PaletteIndex": 0,
                        "Alpha": 1.0,
                    },
                    {
                        "Format": int(ot.PaintFormat.PaintSolid),
                        "PaletteIndex": 0,
                        "Alpha": 0.5,
                    },
                ],
                [
                    '<Paint Format="3"><!-- PaintVarSolid -->',
                    '  <PaletteIndex value="0"/>',
                    '  <Alpha value="1.0"/>',
                    '  <VarIndexBase value="0"/>',
                    "</Paint>",
                ],
                [0],
                id="solid-alpha",
            ),
            pytest.param(
                [
                    {
                        "Format": int(ot.PaintFormat.PaintLinearGradient),
                        "ColorLine": {
                            "Extend": int(ot.ExtendMode.PAD),
                            "ColorStop": [
                                {"StopOffset": 0.0, "PaletteIndex": 0, "Alpha": 1.0},
                                {"StopOffset": 1.0, "PaletteIndex": 1, "Alpha": 1.0},
                            ],
                        },
                        "x0": 0,
                        "y0": 0,
                        "x1": 1,
                        "y1": 1,
                        "x2": 2,
                        "y2": 2,
                    },
                    {
                        "Format": int(ot.PaintFormat.PaintLinearGradient),
                        "ColorLine": {
                            "Extend": int(ot.ExtendMode.PAD),
                            "ColorStop": [
                                {"StopOffset": 0.1, "PaletteIndex": 0, "Alpha": 1.0},
                                {"StopOffset": 0.9, "PaletteIndex": 1, "Alpha": 1.0},
                            ],
                        },
                        "x0": 0,
                        "y0": 0,
                        "x1": 1,
                        "y1": 1,
                        "x2": 2,
                        "y2": 2,
                    },
                ],
                [
                    '<Paint Format="5"><!-- PaintVarLinearGradient -->',
                    "  <ColorLine>",
                    '    <Extend value="pad"/>',
                    "    <!-- StopCount=2 -->",
                    '    <ColorStop index="0">',
                    '      <StopOffset value="0.0"/>',
                    '      <PaletteIndex value="0"/>',
                    '      <Alpha value="1.0"/>',
                    '      <VarIndexBase value="0"/>',
                    "    </ColorStop>",
                    '    <ColorStop index="1">',
                    '      <StopOffset value="1.0"/>',
                    '      <PaletteIndex value="1"/>',
                    '      <Alpha value="1.0"/>',
                    '      <VarIndexBase value="2"/>',
                    "    </ColorStop>",
                    "  </ColorLine>",
                    '  <x0 value="0"/>',
                    '  <y0 value="0"/>',
                    '  <x1 value="1"/>',
                    '  <y1 value="1"/>',
                    '  <x2 value="2"/>',
                    '  <y2 value="2"/>',
                    "  <VarIndexBase/>",
                    "</Paint>",
                ],
                [0, NO_VARIATION_INDEX, 1, NO_VARIATION_INDEX],
                id="linear_grad-stop-offsets",
            ),
            pytest.param(
                [
                    {
                        "Format": int(ot.PaintFormat.PaintLinearGradient),
                        "ColorLine": {
                            "Extend": int(ot.ExtendMode.PAD),
                            "ColorStop": [
                                {"StopOffset": 0.0, "PaletteIndex": 0, "Alpha": 1.0},
                                {"StopOffset": 1.0, "PaletteIndex": 1, "Alpha": 1.0},
                            ],
                        },
                        "x0": 0,
                        "y0": 0,
                        "x1": 1,
                        "y1": 1,
                        "x2": 2,
                        "y2": 2,
                    },
                    {
                        "Format": int(ot.PaintFormat.PaintLinearGradient),
                        "ColorLine": {
                            "Extend": int(ot.ExtendMode.PAD),
                            "ColorStop": [
                                {"StopOffset": 0.0, "PaletteIndex": 0, "Alpha": 0.5},
                                {"StopOffset": 1.0, "PaletteIndex": 1, "Alpha": 1.0},
                            ],
                        },
                        "x0": 0,
                        "y0": 0,
                        "x1": 1,
                        "y1": 1,
                        "x2": 2,
                        "y2": 2,
                    },
                ],
                [
                    '<Paint Format="5"><!-- PaintVarLinearGradient -->',
                    "  <ColorLine>",
                    '    <Extend value="pad"/>',
                    "    <!-- StopCount=2 -->",
                    '    <ColorStop index="0">',
                    '      <StopOffset value="0.0"/>',
                    '      <PaletteIndex value="0"/>',
                    '      <Alpha value="1.0"/>',
                    '      <VarIndexBase value="0"/>',
                    "    </ColorStop>",
                    '    <ColorStop index="1">',
                    '      <StopOffset value="1.0"/>',
                    '      <PaletteIndex value="1"/>',
                    '      <Alpha value="1.0"/>',
                    "      <VarIndexBase/>",
                    "    </ColorStop>",
                    "  </ColorLine>",
                    '  <x0 value="0"/>',
                    '  <y0 value="0"/>',
                    '  <x1 value="1"/>',
                    '  <y1 value="1"/>',
                    '  <x2 value="2"/>',
                    '  <y2 value="2"/>',
                    "  <VarIndexBase/>",
                    "</Paint>",
                ],
                [NO_VARIATION_INDEX, 0],
                id="linear_grad-stop[0].alpha",
            ),
            pytest.param(
                [
                    {
                        "Format": int(ot.PaintFormat.PaintLinearGradient),
                        "ColorLine": {
                            "Extend": int(ot.ExtendMode.PAD),
                            "ColorStop": [
                                {"StopOffset": 0.0, "PaletteIndex": 0, "Alpha": 1.0},
                                {"StopOffset": 1.0, "PaletteIndex": 1, "Alpha": 1.0},
                            ],
                        },
                        "x0": 0,
                        "y0": 0,
                        "x1": 1,
                        "y1": 1,
                        "x2": 2,
                        "y2": 2,
                    },
                    {
                        "Format": int(ot.PaintFormat.PaintLinearGradient),
                        "ColorLine": {
                            "Extend": int(ot.ExtendMode.PAD),
                            "ColorStop": [
                                {"StopOffset": -0.5, "PaletteIndex": 0, "Alpha": 1.0},
                                {"StopOffset": 1.0, "PaletteIndex": 1, "Alpha": 1.0},
                            ],
                        },
                        "x0": 0,
                        "y0": 0,
                        "x1": 1,
                        "y1": 1,
                        "x2": 2,
                        "y2": -200,
                    },
                ],
                [
                    '<Paint Format="5"><!-- PaintVarLinearGradient -->',
                    "  <ColorLine>",
                    '    <Extend value="pad"/>',
                    "    <!-- StopCount=2 -->",
                    '    <ColorStop index="0">',
                    '      <StopOffset value="0.0"/>',
                    '      <PaletteIndex value="0"/>',
                    '      <Alpha value="1.0"/>',
                    '      <VarIndexBase value="0"/>',
                    "    </ColorStop>",
                    '    <ColorStop index="1">',
                    '      <StopOffset value="1.0"/>',
                    '      <PaletteIndex value="1"/>',
                    '      <Alpha value="1.0"/>',
                    "      <VarIndexBase/>",
                    "    </ColorStop>",
                    "  </ColorLine>",
                    '  <x0 value="0"/>',
                    '  <y0 value="0"/>',
                    '  <x1 value="1"/>',
                    '  <y1 value="1"/>',
                    '  <x2 value="2"/>',
                    '  <y2 value="2"/>',
                    '  <VarIndexBase value="1"/>',
                    "</Paint>",
                ],
                [
                    0,
                    NO_VARIATION_INDEX,
                    NO_VARIATION_INDEX,
                    NO_VARIATION_INDEX,
                    NO_VARIATION_INDEX,
                    NO_VARIATION_INDEX,
                    1,
                ],
                id="linear_grad-stop[0].offset-y2",
            ),
            pytest.param(
                [
                    {
                        "Format": int(ot.PaintFormat.PaintRadialGradient),
                        "ColorLine": {
                            "Extend": int(ot.ExtendMode.PAD),
                            "ColorStop": [
                                {"StopOffset": 0.0, "PaletteIndex": 0, "Alpha": 1.0},
                                {"StopOffset": 1.0, "PaletteIndex": 1, "Alpha": 1.0},
                            ],
                        },
                        "x0": 0,
                        "y0": 0,
                        "r0": 0,
                        "x1": 1,
                        "y1": 1,
                        "r1": 1,
                    },
                    {
                        "Format": int(ot.PaintFormat.PaintRadialGradient),
                        "ColorLine": {
                            "Extend": int(ot.ExtendMode.PAD),
                            "ColorStop": [
                                {"StopOffset": 0.1, "PaletteIndex": 0, "Alpha": 0.6},
                                {"StopOffset": 0.9, "PaletteIndex": 1, "Alpha": 0.7},
                            ],
                        },
                        "x0": -1,
                        "y0": -2,
                        "r0": 3,
                        "x1": -4,
                        "y1": -5,
                        "r1": 6,
                    },
                ],
                [
                    '<Paint Format="7"><!-- PaintVarRadialGradient -->',
                    "  <ColorLine>",
                    '    <Extend value="pad"/>',
                    "    <!-- StopCount=2 -->",
                    '    <ColorStop index="0">',
                    '      <StopOffset value="0.0"/>',
                    '      <PaletteIndex value="0"/>',
                    '      <Alpha value="1.0"/>',
                    '      <VarIndexBase value="0"/>',
                    "    </ColorStop>",
                    '    <ColorStop index="1">',
                    '      <StopOffset value="1.0"/>',
                    '      <PaletteIndex value="1"/>',
                    '      <Alpha value="1.0"/>',
                    '      <VarIndexBase value="2"/>',
                    "    </ColorStop>",
                    "  </ColorLine>",
                    '  <x0 value="0"/>',
                    '  <y0 value="0"/>',
                    '  <r0 value="0"/>',
                    '  <x1 value="1"/>',
                    '  <y1 value="1"/>',
                    '  <r1 value="1"/>',
                    '  <VarIndexBase value="4"/>',
                    "</Paint>",
                ],
                [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
                id="radial_grad-all-different",
            ),
            pytest.param(
                [
                    {
                        "Format": int(ot.PaintFormat.PaintSweepGradient),
                        "ColorLine": {
                            "Extend": int(ot.ExtendMode.REPEAT),
                            "ColorStop": [
                                {"StopOffset": 0.4, "PaletteIndex": 0, "Alpha": 1.0},
                                {"StopOffset": 0.6, "PaletteIndex": 1, "Alpha": 1.0},
                            ],
                        },
                        "centerX": 0,
                        "centerY": 0,
                        "startAngle": 0,
                        "endAngle": 180.0,
                    },
                    {
                        "Format": int(ot.PaintFormat.PaintSweepGradient),
                        "ColorLine": {
                            "Extend": int(ot.ExtendMode.REPEAT),
                            "ColorStop": [
                                {"StopOffset": 0.4, "PaletteIndex": 0, "Alpha": 1.0},
                                {"StopOffset": 0.6, "PaletteIndex": 1, "Alpha": 1.0},
                            ],
                        },
                        "centerX": 0,
                        "centerY": 0,
                        "startAngle": 90.0,
                        "endAngle": 180.0,
                    },
                ],
                [
                    '<Paint Format="9"><!-- PaintVarSweepGradient -->',
                    "  <ColorLine>",
                    '    <Extend value="repeat"/>',
                    "    <!-- StopCount=2 -->",
                    '    <ColorStop index="0">',
                    '      <StopOffset value="0.4"/>',
                    '      <PaletteIndex value="0"/>',
                    '      <Alpha value="1.0"/>',
                    "      <VarIndexBase/>",
                    "    </ColorStop>",
                    '    <ColorStop index="1">',
                    '      <StopOffset value="0.6"/>',
                    '      <PaletteIndex value="1"/>',
                    '      <Alpha value="1.0"/>',
                    "      <VarIndexBase/>",
                    "    </ColorStop>",
                    "  </ColorLine>",
                    '  <centerX value="0"/>',
                    '  <centerY value="0"/>',
                    '  <startAngle value="0.0"/>',
                    '  <endAngle value="180.0"/>',
                    '  <VarIndexBase value="0"/>',
                    "</Paint>",
                ],
                [NO_VARIATION_INDEX, NO_VARIATION_INDEX, 0, NO_VARIATION_INDEX],
                id="sweep_grad-startAngle",
            ),
            pytest.param(
                [
                    {
                        "Format": int(ot.PaintFormat.PaintSweepGradient),
                        "ColorLine": {
                            "Extend": int(ot.ExtendMode.PAD),
                            "ColorStop": [
                                {"StopOffset": 0.0, "PaletteIndex": 0, "Alpha": 1.0},
                                {"StopOffset": 1.0, "PaletteIndex": 1, "Alpha": 1.0},
                            ],
                        },
                        "centerX": 0,
                        "centerY": 0,
                        "startAngle": 0.0,
                        "endAngle": 180.0,
                    },
                    {
                        "Format": int(ot.PaintFormat.PaintSweepGradient),
                        "ColorLine": {
                            "Extend": int(ot.ExtendMode.PAD),
                            "ColorStop": [
                                {"StopOffset": 0.0, "PaletteIndex": 0, "Alpha": 0.5},
                                {"StopOffset": 1.0, "PaletteIndex": 1, "Alpha": 0.5},
                            ],
                        },
                        "centerX": 0,
                        "centerY": 0,
                        "startAngle": 0.0,
                        "endAngle": 180.0,
                    },
                ],
                [
                    '<Paint Format="9"><!-- PaintVarSweepGradient -->',
                    "  <ColorLine>",
                    '    <Extend value="pad"/>',
                    "    <!-- StopCount=2 -->",
                    '    <ColorStop index="0">',
                    '      <StopOffset value="0.0"/>',
                    '      <PaletteIndex value="0"/>',
                    '      <Alpha value="1.0"/>',
                    '      <VarIndexBase value="0"/>',
                    "    </ColorStop>",
                    '    <ColorStop index="1">',
                    '      <StopOffset value="1.0"/>',
                    '      <PaletteIndex value="1"/>',
                    '      <Alpha value="1.0"/>',
                    '      <VarIndexBase value="0"/>',
                    "    </ColorStop>",
                    "  </ColorLine>",
                    '  <centerX value="0"/>',
                    '  <centerY value="0"/>',
                    '  <startAngle value="0.0"/>',
                    '  <endAngle value="180.0"/>',
                    "  <VarIndexBase/>",
                    "</Paint>",
                ],
                [NO_VARIATION_INDEX, 0],
                id="sweep_grad-stops-alpha-reuse-varidxbase",
            ),
            pytest.param(
                [
                    {
                        "Format": int(ot.PaintFormat.PaintTransform),
                        "Paint": {
                            "Format": int(ot.PaintFormat.PaintRadialGradient),
                            "ColorLine": {
                                "Extend": int(ot.ExtendMode.PAD),
                                "ColorStop": [
                                    {
                                        "StopOffset": 0.0,
                                        "PaletteIndex": 0,
                                        "Alpha": 1.0,
                                    },
                                    {
                                        "StopOffset": 1.0,
                                        "PaletteIndex": 1,
                                        "Alpha": 1.0,
                                    },
                                ],
                            },
                            "x0": 0,
                            "y0": 0,
                            "r0": 0,
                            "x1": 1,
                            "y1": 1,
                            "r1": 1,
                        },
                        "Transform": {
                            "xx": 1.0,
                            "xy": 0.0,
                            "yx": 0.0,
                            "yy": 1.0,
                            "dx": 0.0,
                            "dy": 0.0,
                        },
                    },
                    {
                        "Format": int(ot.PaintFormat.PaintTransform),
                        "Paint": {
                            "Format": int(ot.PaintFormat.PaintRadialGradient),
                            "ColorLine": {
                                "Extend": int(ot.ExtendMode.PAD),
                                "ColorStop": [
                                    {
                                        "StopOffset": 0.0,
                                        "PaletteIndex": 0,
                                        "Alpha": 1.0,
                                    },
                                    {
                                        "StopOffset": 1.0,
                                        "PaletteIndex": 1,
                                        "Alpha": 1.0,
                                    },
                                ],
                            },
                            "x0": 0,
                            "y0": 0,
                            "r0": 0,
                            "x1": 1,
                            "y1": 1,
                            "r1": 1,
                        },
                        "Transform": {
                            "xx": 1.0,
                            "xy": 0.0,
                            "yx": 0.0,
                            "yy": 0.5,
                            "dx": 0.0,
                            "dy": -100.0,
                        },
                    },
                ],
                [
                    '<Paint Format="13"><!-- PaintVarTransform -->',
                    '  <Paint Format="6"><!-- PaintRadialGradient -->',
                    "    <ColorLine>",
                    '      <Extend value="pad"/>',
                    "      <!-- StopCount=2 -->",
                    '      <ColorStop index="0">',
                    '        <StopOffset value="0.0"/>',
                    '        <PaletteIndex value="0"/>',
                    '        <Alpha value="1.0"/>',
                    "      </ColorStop>",
                    '      <ColorStop index="1">',
                    '        <StopOffset value="1.0"/>',
                    '        <PaletteIndex value="1"/>',
                    '        <Alpha value="1.0"/>',
                    "      </ColorStop>",
                    "    </ColorLine>",
                    '    <x0 value="0"/>',
                    '    <y0 value="0"/>',
                    '    <r0 value="0"/>',
                    '    <x1 value="1"/>',
                    '    <y1 value="1"/>',
                    '    <r1 value="1"/>',
                    "  </Paint>",
                    "  <Transform>",
                    '    <xx value="1.0"/>',
                    '    <yx value="0.0"/>',
                    '    <xy value="0.0"/>',
                    '    <yy value="1.0"/>',
                    '    <dx value="0.0"/>',
                    '    <dy value="0.0"/>',
                    '    <VarIndexBase value="0"/>',
                    "  </Transform>",
                    "</Paint>",
                ],
                [
                    NO_VARIATION_INDEX,
                    NO_VARIATION_INDEX,
                    NO_VARIATION_INDEX,
                    0,
                    NO_VARIATION_INDEX,
                    1,
                ],
                id="transform-yy-dy",
            ),
            pytest.param(
                [
                    {
                        "Format": ot.PaintFormat.PaintTransform,
                        "Paint": {
                            "Format": ot.PaintFormat.PaintSweepGradient,
                            "ColorLine": {
                                "Extend": ot.ExtendMode.PAD,
                                "ColorStop": [
                                    {"StopOffset": 0.0, "PaletteIndex": 0},
                                    {
                                        "StopOffset": 1.0,
                                        "PaletteIndex": 1,
                                        "Alpha": 1.0,
                                    },
                                ],
                            },
                            "centerX": 0,
                            "centerY": 0,
                            "startAngle": -360,
                            "endAngle": 0,
                        },
                        "Transform": (1.0, 0, 0, 1.0, 0, 0),
                    },
                    {
                        "Format": ot.PaintFormat.PaintTransform,
                        "Paint": {
                            "Format": ot.PaintFormat.PaintSweepGradient,
                            "ColorLine": {
                                "Extend": ot.ExtendMode.PAD,
                                "ColorStop": [
                                    {"StopOffset": 0.0, "PaletteIndex": 0},
                                    {
                                        "StopOffset": 1.0,
                                        "PaletteIndex": 1,
                                        "Alpha": 1.0,
                                    },
                                ],
                            },
                            "centerX": 256,
                            "centerY": 0,
                            "startAngle": -360,
                            "endAngle": 0,
                        },
                        # Transform.xx below produces the same VarStore delta as the
                        # above PaintSweepGradient's centerX because, when Fixed16.16
                        # is converted to integer, it becomes:
                        # floatToFixed(1.00390625, 16) == 256
                        # Because there is overlap between the varIdxes of the
                        # PaintVarTransform's Affine2x3 and the PaintSweepGradient's
                        # the VarIndexBase is reused (0 for both)
                        "Transform": (1.00390625, 0, 0, 1.0, 10, 0),
                    },
                ],
                [
                    '<Paint Format="13"><!-- PaintVarTransform -->',
                    '  <Paint Format="9"><!-- PaintVarSweepGradient -->',
                    "    <ColorLine>",
                    '      <Extend value="pad"/>',
                    "      <!-- StopCount=2 -->",
                    '      <ColorStop index="0">',
                    '        <StopOffset value="0.0"/>',
                    '        <PaletteIndex value="0"/>',
                    '        <Alpha value="1.0"/>',
                    "        <VarIndexBase/>",
                    "      </ColorStop>",
                    '      <ColorStop index="1">',
                    '        <StopOffset value="1.0"/>',
                    '        <PaletteIndex value="1"/>',
                    '        <Alpha value="1.0"/>',
                    "        <VarIndexBase/>",
                    "      </ColorStop>",
                    "    </ColorLine>",
                    '    <centerX value="0"/>',
                    '    <centerY value="0"/>',
                    '    <startAngle value="-360.0"/>',
                    '    <endAngle value="0.0"/>',
                    '    <VarIndexBase value="0"/>',
                    "  </Paint>",
                    "  <Transform>",
                    '    <xx value="1.0"/>',
                    '    <yx value="0.0"/>',
                    '    <xy value="0.0"/>',
                    '    <yy value="1.0"/>',
                    '    <dx value="0.0"/>',
                    '    <dy value="0.0"/>',
                    '    <VarIndexBase value="0"/>',
                    "  </Transform>",
                    "</Paint>",
                ],
                [
                    0,
                    NO_VARIATION_INDEX,
                    NO_VARIATION_INDEX,
                    NO_VARIATION_INDEX,
                    1,
                    NO_VARIATION_INDEX,
                ],
                id="transform-xx-sweep_grad-centerx-same-varidxbase",
            ),
        ],
    )
    def test_merge_Paint(self, paints, ttFont, expected_xml, expected_varIdxes):
        paints = [build_paint(p) for p in paints]
        out = deepcopy(paints[0])

        model = VariationModel([{}, {"ZZZZ": 1.0}])
        merger = COLRVariationMerger(model, ["ZZZZ"], ttFont)

        merger.mergeThings(out, paints)

        assert compile_decompile(out, ttFont) == out
        assert dump_xml(out, ttFont) == expected_xml
        assert merger.varIdxes == expected_varIdxes

    def test_merge_ClipList(self, ttFont):
        clipLists = [
            buildClipList(clips)
            for clips in [
                {
                    "A": (0, 0, 1000, 1000),
                    "B": (0, 0, 1000, 1000),
                    "C": (0, 0, 1000, 1000),
                    "D": (0, 0, 1000, 1000),
                },
                {
                    # non-default masters' clip boxes can be 'sparse'
                    # (i.e. can omit explicit clip box for some glyphs)
                    # "A": (0, 0, 1000, 1000),
                    "B": (10, 0, 1000, 1000),
                    "C": (20, 20, 1020, 1020),
                    "D": (20, 20, 1020, 1020),
                },
            ]
        ]
        out = deepcopy(clipLists[0])

        model = VariationModel([{}, {"ZZZZ": 1.0}])
        merger = COLRVariationMerger(model, ["ZZZZ"], ttFont)

        merger.mergeThings(out, clipLists)

        assert compile_decompile(out, ttFont) == out
        assert dump_xml(out, ttFont) == [
            '<ClipList Format="1">',
            "  <Clip>",
            '    <Glyph value="A"/>',
            '    <ClipBox Format="1">',
            '      <xMin value="0"/>',
            '      <yMin value="0"/>',
            '      <xMax value="1000"/>',
            '      <yMax value="1000"/>',
            "    </ClipBox>",
            "  </Clip>",
            "  <Clip>",
            '    <Glyph value="B"/>',
            '    <ClipBox Format="2">',
            '      <xMin value="0"/>',
            '      <yMin value="0"/>',
            '      <xMax value="1000"/>',
            '      <yMax value="1000"/>',
            '      <VarIndexBase value="0"/>',
            "    </ClipBox>",
            "  </Clip>",
            "  <Clip>",
            '    <Glyph value="C"/>',
            '    <Glyph value="D"/>',
            '    <ClipBox Format="2">',
            '      <xMin value="0"/>',
            '      <yMin value="0"/>',
            '      <xMax value="1000"/>',
            '      <yMax value="1000"/>',
            '      <VarIndexBase value="4"/>',
            "    </ClipBox>",
            "  </Clip>",
            "</ClipList>",
        ]
        assert merger.varIdxes == [
            0,
            NO_VARIATION_INDEX,
            NO_VARIATION_INDEX,
            NO_VARIATION_INDEX,
            1,
            1,
            1,
            1,
        ]