"""Tests for the AMS mapping computation in the print scheduler."""

import io
import json
import zipfile

import pytest

from backend.app.services.print_scheduler import PrintScheduler
from backend.app.utils.threemf_tools import extract_nozzle_mapping_from_3mf


class TestSchedulerAmsMappingHelpers:
    """Test the AMS mapping helper methods in PrintScheduler."""

    @pytest.fixture
    def scheduler(self):
        return PrintScheduler()

    def test_normalize_color_with_hash(self, scheduler):
        """Color with hash should return #RRGGBB format."""
        result = scheduler._normalize_color("#FF5500")
        assert result == "#FF5500"

    def test_normalize_color_without_hash(self, scheduler):
        """Color without hash should add hash prefix."""
        result = scheduler._normalize_color("FF5500")
        assert result == "#FF5500"

    def test_normalize_color_with_alpha(self, scheduler):
        """Color with alpha channel should strip it."""
        result = scheduler._normalize_color("FF5500AA")
        assert result == "#FF5500"

    def test_normalize_color_none(self, scheduler):
        """None color should return default gray."""
        result = scheduler._normalize_color(None)
        assert result == "#808080"

    def test_normalize_color_empty(self, scheduler):
        """Empty color should return default gray."""
        result = scheduler._normalize_color("")
        assert result == "#808080"

    def test_normalize_color_for_compare(self, scheduler):
        """Color for compare should be lowercase without hash."""
        result = scheduler._normalize_color_for_compare("#FF5500")
        assert result == "ff5500"

    def test_normalize_color_for_compare_with_alpha(self, scheduler):
        """Alpha channel should be stripped for comparison."""
        result = scheduler._normalize_color_for_compare("#FF5500AA")
        assert result == "ff5500"

    def test_colors_are_similar_exact_match(self, scheduler):
        """Exact same colors should be similar."""
        assert scheduler._colors_are_similar("#FF5500", "#FF5500") is True

    def test_colors_are_similar_within_threshold(self, scheduler):
        """Colors within threshold should be similar."""
        # Red difference of 10, well within default threshold of 40
        assert scheduler._colors_are_similar("#FF5500", "#F55500") is True

    def test_colors_are_similar_outside_threshold(self, scheduler):
        """Colors outside threshold should not be similar."""
        # Red: FF (255) vs 00 (0) = 255 difference
        assert scheduler._colors_are_similar("#FF0000", "#00FF00") is False

    def test_colors_are_similar_none_colors(self, scheduler):
        """None colors should not be similar."""
        assert scheduler._colors_are_similar(None, "#FF5500") is False
        assert scheduler._colors_are_similar("#FF5500", None) is False


class TestBuildLoadedFilaments:
    """Test the _build_loaded_filaments method."""

    @pytest.fixture
    def scheduler(self):
        return PrintScheduler()

    def test_build_loaded_filaments_empty_status(self, scheduler):
        """Empty status should return empty list."""

        class MockStatus:
            raw_data = {}

        result = scheduler._build_loaded_filaments(MockStatus())
        assert result == []

    def test_build_loaded_filaments_with_ams(self, scheduler):
        """Should extract filaments from AMS units."""

        class MockStatus:
            raw_data = {
                "ams": [
                    {
                        "id": 0,
                        "tray": [
                            {"id": 0, "tray_type": "PLA", "tray_color": "FF0000"},
                            {"id": 1, "tray_type": "PETG", "tray_color": "00FF00"},
                        ],
                    }
                ]
            }

        result = scheduler._build_loaded_filaments(MockStatus())
        assert len(result) == 2

        # First filament
        assert result[0]["type"] == "PLA"
        assert result[0]["color"] == "#FF0000"
        assert result[0]["ams_id"] == 0
        assert result[0]["tray_id"] == 0
        assert result[0]["global_tray_id"] == 0  # 0 * 4 + 0

        # Second filament
        assert result[1]["type"] == "PETG"
        assert result[1]["global_tray_id"] == 1  # 0 * 4 + 1

    def test_build_loaded_filaments_with_ht_ams(self, scheduler):
        """AMS-HT (single tray) should be marked as is_ht."""

        class MockStatus:
            raw_data = {
                "ams": [
                    {
                        "id": 128,
                        "tray": [{"id": 0, "tray_type": "PLA-CF", "tray_color": "000000"}],
                    }
                ]
            }

        result = scheduler._build_loaded_filaments(MockStatus())
        assert len(result) == 1
        assert result[0]["is_ht"] is True
        assert result[0]["global_tray_id"] == 128  # AMS-HT uses ams_id directly

    def test_build_loaded_filaments_with_external(self, scheduler):
        """Should include external spool."""

        class MockStatus:
            raw_data = {"vt_tray": [{"tray_type": "TPU", "tray_color": "0000FF"}]}

        result = scheduler._build_loaded_filaments(MockStatus())
        assert len(result) == 1
        assert result[0]["type"] == "TPU"
        assert result[0]["is_external"] is True
        assert result[0]["global_tray_id"] == 254

    def test_build_loaded_filaments_skips_empty_trays(self, scheduler):
        """Trays without tray_type should be skipped."""

        class MockStatus:
            raw_data = {
                "ams": [
                    {
                        "id": 0,
                        "tray": [
                            {"id": 0, "tray_type": "PLA", "tray_color": "FF0000"},
                            {"id": 1, "tray_type": "", "tray_color": ""},  # Empty
                            {"id": 2},  # No tray_type key
                        ],
                    }
                ]
            }

        result = scheduler._build_loaded_filaments(MockStatus())
        assert len(result) == 1
        assert result[0]["type"] == "PLA"


class TestMatchFilamentsToSlots:
    """Test the _match_filaments_to_slots method."""

    @pytest.fixture
    def scheduler(self):
        return PrintScheduler()

    def test_match_empty_required(self, scheduler):
        """Empty required list should return None."""
        result = scheduler._match_filaments_to_slots([], [])
        assert result is None

    def test_match_exact_color(self, scheduler):
        """Should prefer exact color match."""
        required = [{"slot_id": 1, "type": "PLA", "color": "#FF0000"}]
        loaded = [
            {"type": "PLA", "color": "#00FF00", "global_tray_id": 0},  # Wrong color
            {"type": "PLA", "color": "#FF0000", "global_tray_id": 1},  # Exact match
        ]

        result = scheduler._match_filaments_to_slots(required, loaded)
        assert result == [1]  # Should pick tray 1 (exact color match)

    def test_match_similar_color(self, scheduler):
        """Should match similar colors when no exact match."""
        required = [{"slot_id": 1, "type": "PLA", "color": "#FF5500"}]
        loaded = [
            {"type": "PLA", "color": "#FF5510", "global_tray_id": 0},  # Similar
        ]

        result = scheduler._match_filaments_to_slots(required, loaded)
        assert result == [0]

    def test_match_type_only(self, scheduler):
        """Should match by type when colors don't match."""
        required = [{"slot_id": 1, "type": "PLA", "color": "#FF0000"}]
        loaded = [
            {"type": "PLA", "color": "#0000FF", "global_tray_id": 5},  # Type match, color way off
        ]

        result = scheduler._match_filaments_to_slots(required, loaded)
        assert result == [5]

    def test_match_no_match_returns_minus_one(self, scheduler):
        """Unmatched filaments should have -1 in mapping."""
        required = [{"slot_id": 1, "type": "PLA", "color": "#FF0000"}]
        loaded = [
            {"type": "PETG", "color": "#FF0000", "global_tray_id": 0},  # Wrong type
        ]

        result = scheduler._match_filaments_to_slots(required, loaded)
        assert result == [-1]

    def test_match_multiple_filaments(self, scheduler):
        """Should match multiple filaments correctly."""
        required = [
            {"slot_id": 1, "type": "PLA", "color": "#FF0000"},
            {"slot_id": 2, "type": "PETG", "color": "#00FF00"},
        ]
        loaded = [
            {"type": "PLA", "color": "#FF0000", "global_tray_id": 0},
            {"type": "PETG", "color": "#00FF00", "global_tray_id": 1},
        ]

        result = scheduler._match_filaments_to_slots(required, loaded)
        assert result == [0, 1]

    def test_match_avoids_duplicate_assignment(self, scheduler):
        """Same tray should not be assigned to multiple slots."""
        required = [
            {"slot_id": 1, "type": "PLA", "color": "#FF0000"},
            {"slot_id": 2, "type": "PLA", "color": "#FF0000"},  # Same requirements
        ]
        loaded = [
            {"type": "PLA", "color": "#FF0000", "global_tray_id": 0},  # Only one PLA
        ]

        result = scheduler._match_filaments_to_slots(required, loaded)
        # First slot gets the match, second slot gets -1
        assert result == [0, -1]

    def test_match_h2d_pro_ams_ids(self, scheduler):
        """Should work with H2D Pro's high AMS IDs (128+)."""
        required = [{"slot_id": 1, "type": "PLA", "color": "#FF0000"}]
        loaded = [
            {"type": "PLA", "color": "#FF0000", "global_tray_id": 512},  # AMS 128, slot 0
        ]

        result = scheduler._match_filaments_to_slots(required, loaded)
        assert result == [512]

    def test_match_external_spool(self, scheduler):
        """Should match external spool with ID 254."""
        required = [{"slot_id": 1, "type": "TPU", "color": "#0000FF"}]
        loaded = [
            {"type": "TPU", "color": "#0000FF", "global_tray_id": 254, "is_external": True},
        ]

        result = scheduler._match_filaments_to_slots(required, loaded)
        assert result == [254]

    def test_match_by_tray_info_idx_priority(self, scheduler):
        """tray_info_idx match should have highest priority over color match."""
        required = [{"slot_id": 1, "type": "PLA", "color": "#000000", "tray_info_idx": "GFA00"}]
        loaded = [
            {
                "type": "PLA",
                "color": "#000000",
                "global_tray_id": 0,
                "tray_info_idx": "GFB00",
            },  # Same color, different spool
            {
                "type": "PLA",
                "color": "#000000",
                "global_tray_id": 1,
                "tray_info_idx": "GFA00",
            },  # Same color, exact spool
            {
                "type": "PLA",
                "color": "#000000",
                "global_tray_id": 2,
                "tray_info_idx": "GFC00",
            },  # Same color, different spool
        ]

        result = scheduler._match_filaments_to_slots(required, loaded)
        assert result == [1]  # Should pick tray 1 (exact tray_info_idx match)

    def test_match_by_tray_info_idx_with_different_colors(self, scheduler):
        """tray_info_idx match should work even if colors differ slightly."""
        required = [{"slot_id": 1, "type": "PLA", "color": "#000000", "tray_info_idx": "P4d64437"}]
        loaded = [
            {"type": "PLA", "color": "#000000", "global_tray_id": 0, "tray_info_idx": ""},  # No idx
            {
                "type": "PLA",
                "color": "#000010",
                "global_tray_id": 3,
                "tray_info_idx": "P4d64437",
            },  # Exact spool (slightly different color reported)
        ]

        result = scheduler._match_filaments_to_slots(required, loaded)
        assert result == [3]  # Should pick tray 3 (exact tray_info_idx match)

    def test_match_fallback_to_color_when_no_tray_info_idx(self, scheduler):
        """Should fall back to color matching when tray_info_idx is empty."""
        required = [{"slot_id": 1, "type": "PLA", "color": "#FF0000", "tray_info_idx": ""}]
        loaded = [
            {"type": "PLA", "color": "#00FF00", "global_tray_id": 0, "tray_info_idx": "GFA00"},
            {"type": "PLA", "color": "#FF0000", "global_tray_id": 1, "tray_info_idx": "GFB00"},  # Color match
        ]

        result = scheduler._match_filaments_to_slots(required, loaded)
        assert result == [1]  # Should pick tray 1 (color match)

    def test_match_fallback_to_color_when_no_matching_tray_info_idx(self, scheduler):
        """Should fall back to color when tray_info_idx doesn't match any loaded spool."""
        required = [{"slot_id": 1, "type": "PLA", "color": "#FF0000", "tray_info_idx": "OLD_SPOOL"}]
        loaded = [
            {
                "type": "PLA",
                "color": "#FF0000",
                "global_tray_id": 0,
                "tray_info_idx": "NEW_SPOOL",
            },  # Different idx but same color
        ]

        result = scheduler._match_filaments_to_slots(required, loaded)
        assert result == [0]  # Should fall back to color match

    def test_match_multiple_same_color_with_tray_info_idx(self, scheduler):
        """Multiple identical filaments should be matched by tray_info_idx (H2D Pro scenario)."""
        # This is the exact scenario from issue #245 - 3 black PLA spools
        required = [
            {"slot_id": 1, "type": "PLA", "color": "#000000", "tray_info_idx": "GFA03"},  # Wants tray 3
        ]
        loaded = [
            {"type": "PLA", "color": "#000000", "global_tray_id": 0, "tray_info_idx": "GFA00"},  # Tray 0
            {"type": "PLA", "color": "#000000", "global_tray_id": 1, "tray_info_idx": "GFA01"},  # Tray 1
            {"type": "PLA", "color": "#000000", "global_tray_id": 2, "tray_info_idx": "GFA02"},  # Tray 2
            {
                "type": "PLA",
                "color": "#000000",
                "global_tray_id": 3,
                "tray_info_idx": "GFA03",
            },  # Tray 3 - the one we want
        ]

        result = scheduler._match_filaments_to_slots(required, loaded)
        assert result == [3]  # Should pick tray 3, not tray 0

    def test_match_tray_info_idx_not_reused(self, scheduler):
        """tray_info_idx matched trays should not be reused for other slots."""
        required = [
            {"slot_id": 1, "type": "PLA", "color": "#000000", "tray_info_idx": "GFA00"},
            {"slot_id": 2, "type": "PLA", "color": "#000000", "tray_info_idx": "GFA01"},
        ]
        loaded = [
            {"type": "PLA", "color": "#000000", "global_tray_id": 0, "tray_info_idx": "GFA00"},
            {"type": "PLA", "color": "#000000", "global_tray_id": 1, "tray_info_idx": "GFA01"},
        ]

        result = scheduler._match_filaments_to_slots(required, loaded)
        assert result == [0, 1]  # Each slot gets its specific tray

    def test_match_non_unique_tray_info_idx_uses_color(self, scheduler):
        """Non-unique tray_info_idx should fall back to color matching.

        This is the scenario where multiple trays have the same tray_info_idx
        (e.g., two spools of generic PLA both have GFA00). The color should
        be used as tiebreaker instead of just picking the first match.
        """
        # User sliced with green PLA (tray_info_idx=GFA00)
        # Two trays have GFA00: tray 3 (white) and tray 4 (green)
        # Should pick tray 4 because the color matches
        required = [
            {"slot_id": 2, "type": "PLA", "color": "#00FF00", "tray_info_idx": "GFA00"},  # Green PLA
        ]
        loaded = [
            {"type": "PLA", "color": "#FFFFFF", "global_tray_id": 3, "tray_info_idx": "GFA00"},  # White PLA
            {"type": "PLA", "color": "#00FF00", "global_tray_id": 4, "tray_info_idx": "GFA00"},  # Green PLA
        ]

        result = scheduler._match_filaments_to_slots(required, loaded)
        assert result == [-1, 4]  # Should pick tray 4 (color match), not tray 3 (first match)

    def test_match_non_unique_tray_info_idx_same_color(self, scheduler):
        """Non-unique tray_info_idx with identical colors picks first match.

        When multiple trays have the same tray_info_idx AND same color,
        there's no way to differentiate, so first match is used.
        """
        required = [
            {"slot_id": 2, "type": "PLA", "color": "#FFFFFF", "tray_info_idx": "GFA00"},
        ]
        loaded = [
            {"type": "PLA", "color": "#FFFFFF", "global_tray_id": 3, "tray_info_idx": "GFA00"},
            {"type": "PLA", "color": "#FFFFFF", "global_tray_id": 4, "tray_info_idx": "GFA00"},
        ]

        result = scheduler._match_filaments_to_slots(required, loaded)
        # Both have same color, so first is used
        assert result == [-1, 3]


class TestBuildLoadedFilamentsTrayInfoIdx:
    """Test tray_info_idx extraction in _build_loaded_filaments."""

    @pytest.fixture
    def scheduler(self):
        return PrintScheduler()

    def test_build_loaded_filaments_includes_tray_info_idx(self, scheduler):
        """Should extract tray_info_idx from AMS trays."""

        class MockStatus:
            raw_data = {
                "ams": [
                    {
                        "id": 0,
                        "tray": [
                            {"id": 0, "tray_type": "PLA", "tray_color": "000000", "tray_info_idx": "GFA00"},
                            {"id": 1, "tray_type": "PLA", "tray_color": "000000", "tray_info_idx": "GFA01"},
                        ],
                    }
                ]
            }

        result = scheduler._build_loaded_filaments(MockStatus())
        assert len(result) == 2
        assert result[0]["tray_info_idx"] == "GFA00"
        assert result[1]["tray_info_idx"] == "GFA01"

    def test_build_loaded_filaments_empty_tray_info_idx(self, scheduler):
        """Missing tray_info_idx should default to empty string."""

        class MockStatus:
            raw_data = {
                "ams": [
                    {
                        "id": 0,
                        "tray": [
                            {"id": 0, "tray_type": "PLA", "tray_color": "FF0000"},  # No tray_info_idx
                        ],
                    }
                ]
            }

        result = scheduler._build_loaded_filaments(MockStatus())
        assert len(result) == 1
        assert result[0]["tray_info_idx"] == ""

    def test_build_loaded_filaments_external_spool_tray_info_idx(self, scheduler):
        """Should extract tray_info_idx from external spool."""

        class MockStatus:
            raw_data = {"vt_tray": [{"tray_type": "TPU", "tray_color": "0000FF", "tray_info_idx": "P4d64437"}]}

        result = scheduler._build_loaded_filaments(MockStatus())
        assert len(result) == 1
        assert result[0]["tray_info_idx"] == "P4d64437"
        assert result[0]["is_external"] is True


def _make_3mf_zip(
    project_settings: dict | None = None,
    slice_info_xml: str | None = None,
) -> zipfile.ZipFile:
    """Create an in-memory ZipFile mimicking a 3MF with project_settings.config."""
    buf = io.BytesIO()
    with zipfile.ZipFile(buf, "w") as zf:
        if project_settings is not None:
            zf.writestr("Metadata/project_settings.config", json.dumps(project_settings))
        if slice_info_xml is not None:
            zf.writestr("Metadata/slice_info.config", slice_info_xml)
    buf.seek(0)
    return zipfile.ZipFile(buf, "r")


class TestExtractNozzleMappingFrom3mf:
    """Test the extract_nozzle_mapping_from_3mf utility."""

    def test_group_id_priority_over_filament_nozzle_map(self):
        """group_id from slice_info should override filament_nozzle_map from project_settings.

        Real-world scenario: "Auto For Flush" mode sets filament_nozzle_map all to 0
        (user preference) but the actual assignment in slice_info has different group_ids.
        """
        # filament_nozzle_map says all on slicer ext 0 → MQTT ext 1 (LEFT)
        # But slice_info group_id says slot 6 → group 0 (LEFT), slot 12 → group 1 (RIGHT)
        slice_info = """<?xml version="1.0" encoding="UTF-8"?>
        <config>
          <plate>
            <filament id="6" type="PLA" color="#56B7E6" used_g="1.84" group_id="0"/>
            <filament id="12" type="PLA" color="#B39B84" used_g="1.76" group_id="1"/>
          </plate>
        </config>"""
        zf = _make_3mf_zip(
            {
                "filament_nozzle_map": ["0"] * 12,
                "physical_extruder_map": ["1", "0"],
            },
            slice_info_xml=slice_info,
        )
        result = extract_nozzle_mapping_from_3mf(zf)
        # group_id 0 → physical_extruder_map[0] = 1 (LEFT)
        # group_id 1 → physical_extruder_map[1] = 0 (RIGHT)
        assert result == {6: 1, 12: 0}
        zf.close()

    def test_fallback_to_filament_nozzle_map_without_group_id(self):
        """Should fall back to filament_nozzle_map when slice_info has no group_id."""
        slice_info = """<?xml version="1.0" encoding="UTF-8"?>
        <config>
          <plate>
            <filament id="1" type="PLA" color="#FF0000" used_g="5.0"/>
          </plate>
        </config>"""
        zf = _make_3mf_zip(
            {
                "filament_nozzle_map": ["0", "1", "0"],
                "physical_extruder_map": ["0", "1"],
            },
            slice_info_xml=slice_info,
        )
        result = extract_nozzle_mapping_from_3mf(zf)
        assert result == {1: 0, 2: 1, 3: 0}
        zf.close()

    def test_fallback_to_filament_nozzle_map_without_slice_info(self):
        """Should fall back to filament_nozzle_map when no slice_info.config exists."""
        zf = _make_3mf_zip(
            {
                "filament_nozzle_map": ["0", "1", "0"],
                "physical_extruder_map": ["0", "1"],
            }
        )
        result = extract_nozzle_mapping_from_3mf(zf)
        assert result == {1: 0, 2: 1, 3: 0}
        zf.close()

    def test_single_nozzle_returns_none(self):
        """Single physical_extruder_map entry should return None (single-nozzle)."""
        zf = _make_3mf_zip(
            {
                "filament_nozzle_map": ["0", "0", "0"],
                "physical_extruder_map": ["0"],
            }
        )
        result = extract_nozzle_mapping_from_3mf(zf)
        assert result is None
        zf.close()

    def test_missing_project_settings_returns_none(self):
        """Missing project_settings.config should return None."""
        zf = _make_3mf_zip(None)
        result = extract_nozzle_mapping_from_3mf(zf)
        assert result is None
        zf.close()

    def test_missing_fields_returns_none(self):
        """Missing physical_extruder_map should return None."""
        zf = _make_3mf_zip({"some_other_key": "value"})
        result = extract_nozzle_mapping_from_3mf(zf)
        assert result is None
        zf.close()

    def test_physical_extruder_map_remapping(self):
        """Should apply physical_extruder_map to remap slicer extruder to MQTT extruder."""
        # Slicer ext 0 -> MQTT ext 1, slicer ext 1 -> MQTT ext 0
        zf = _make_3mf_zip(
            {
                "filament_nozzle_map": ["0", "1"],
                "physical_extruder_map": ["1", "0"],
            }
        )
        result = extract_nozzle_mapping_from_3mf(zf)
        assert result == {1: 1, 2: 0}
        zf.close()


class TestNozzleAwareMapping:
    """Test nozzle-aware filament matching in the print scheduler."""

    @pytest.fixture
    def scheduler(self):
        return PrintScheduler()

    def test_dual_nozzle_matching(self, scheduler):
        """Filaments assigned to different nozzles should match to correct AMS units."""
        required = [
            {"slot_id": 1, "type": "PLA", "color": "#FF0000", "nozzle_id": 0},  # Right nozzle
            {"slot_id": 2, "type": "PLA", "color": "#00FF00", "nozzle_id": 1},  # Left nozzle
        ]
        loaded = [
            {"type": "PLA", "color": "#00FF00", "global_tray_id": 0, "extruder_id": 0},  # AMS0 on right
            {"type": "PLA", "color": "#FF0000", "global_tray_id": 4, "extruder_id": 1},  # AMS1 on left
        ]
        # Without nozzle filtering, slot 1 (red, right) would match tray 4 (red, left) by color.
        # With nozzle filtering, slot 1 (right nozzle) can only use tray 0 (right extruder),
        # and slot 2 (left nozzle) can only use tray 4 (left extruder).
        result = scheduler._match_filaments_to_slots(required, loaded)
        assert result == [0, 4]

    def test_nozzle_hard_filter_no_fallback(self, scheduler):
        """Hard filter: no fallback to wrong nozzle when target nozzle has no trays."""
        required = [
            {"slot_id": 1, "type": "PLA", "color": "#FF0000", "nozzle_id": 0},  # Right nozzle
        ]
        loaded = [
            # Only a tray on the left nozzle, none on right
            {"type": "PLA", "color": "#FF0000", "global_tray_id": 4, "extruder_id": 1},
        ]
        # No trays on extruder 0 — hard filter returns -1, no cross-nozzle fallback
        result = scheduler._match_filaments_to_slots(required, loaded)
        assert result == [-1]

    def test_no_nozzle_id_skips_filtering(self, scheduler):
        """When nozzle_id is None, no nozzle filtering should be applied."""
        required = [
            {"slot_id": 1, "type": "PLA", "color": "#FF0000"},  # No nozzle_id
        ]
        loaded = [
            {"type": "PLA", "color": "#FF0000", "global_tray_id": 0, "extruder_id": 0},
            {"type": "PLA", "color": "#FF0000", "global_tray_id": 4, "extruder_id": 1},
        ]
        # Should match first available (tray 0) regardless of extruder
        result = scheduler._match_filaments_to_slots(required, loaded)
        assert result == [0]

    def test_extruder_id_in_loaded_filaments(self, scheduler):
        """_build_loaded_filaments should include extruder_id from ams_extruder_map."""

        class MockStatus:
            raw_data = {
                "ams": [
                    {"id": 0, "tray": [{"id": 0, "tray_type": "PLA", "tray_color": "FF0000"}]},
                    {"id": 1, "tray": [{"id": 0, "tray_type": "PLA", "tray_color": "00FF00"}]},
                ],
                "ams_extruder_map": {"0": 0, "1": 1},
            }

        result = scheduler._build_loaded_filaments(MockStatus())
        assert len(result) == 2
        assert result[0]["extruder_id"] == 0
        assert result[1]["extruder_id"] == 1

    def test_extruder_id_none_without_map(self, scheduler):
        """extruder_id should be None when ams_extruder_map is absent."""

        class MockStatus:
            raw_data = {
                "ams": [
                    {"id": 0, "tray": [{"id": 0, "tray_type": "PLA", "tray_color": "FF0000"}]},
                ]
            }

        result = scheduler._build_loaded_filaments(MockStatus())
        assert len(result) == 1
        assert result[0]["extruder_id"] is None

    def test_external_spool_extruder_id(self, scheduler):
        """External spool 254 (Ext-L) should have extruder_id=1 (LEFT) when ams_extruder_map exists."""

        class MockStatus:
            raw_data = {
                "vt_tray": [{"tray_type": "TPU", "tray_color": "0000FF"}],
                "ams_extruder_map": {"0": 0},
            }

        result = scheduler._build_loaded_filaments(MockStatus())
        assert len(result) == 1
        # Default vt_tray id=254 → Ext-L → LEFT nozzle (extruder 1)
        assert result[0]["extruder_id"] == 1
        assert result[0]["is_external"] is True

    def test_external_spool_no_extruder_map(self, scheduler):
        """External spool extruder_id should be None without ams_extruder_map."""

        class MockStatus:
            raw_data = {"vt_tray": [{"tray_type": "TPU", "tray_color": "0000FF"}]}

        result = scheduler._build_loaded_filaments(MockStatus())
        assert len(result) == 1
        assert result[0]["extruder_id"] is None

    def test_dual_nozzle_with_tray_info_idx(self, scheduler):
        """Nozzle filtering should work together with tray_info_idx matching."""
        required = [
            {"slot_id": 1, "type": "PLA", "color": "#000000", "tray_info_idx": "GFA00", "nozzle_id": 0},
            {"slot_id": 2, "type": "PLA", "color": "#000000", "tray_info_idx": "GFA01", "nozzle_id": 1},
        ]
        loaded = [
            {"type": "PLA", "color": "#000000", "global_tray_id": 0, "tray_info_idx": "GFA00", "extruder_id": 0},
            {"type": "PLA", "color": "#000000", "global_tray_id": 4, "tray_info_idx": "GFA01", "extruder_id": 1},
        ]
        result = scheduler._match_filaments_to_slots(required, loaded)
        assert result == [0, 4]


# ============================================================================
# MODEL-SPECIFIC TESTS: Real data from actual printers
# ============================================================================


def _h2d_raw_data():
    """H2D real data fixture (from live API response 2026-02-18).

    Configuration:
        LEFT nozzle (extruder 1): AMS 0 (4-slot), AMS 2 (4-slot)
        RIGHT nozzle (extruder 0): AMS 1 (4-slot), AMS-HT 128 (1-slot, empty)
        External: 254 (Ext-L, LEFT), 255 (Ext-R, RIGHT, empty)

    ams_extruder_map: {"0": 1, "1": 0, "2": 1, "128": 0}
    """
    return {
        "ams": [
            {
                "id": 0,
                "tray": [
                    {"id": 0, "tray_type": "PETG", "tray_color": "FFFFFFFF", "tray_info_idx": "GFG02"},
                    {"id": 1, "tray_type": "PLA", "tray_color": "C8C8C8FF", "tray_info_idx": "GFA06"},
                    {"id": 2, "tray_type": "PETG", "tray_color": "875718FF", "tray_info_idx": "GFG02"},
                    {"id": 3, "tray_type": "PLA", "tray_color": "000000FF", "tray_info_idx": "GFA00"},
                ],
            },
            {
                "id": 1,
                "tray": [
                    {"id": 0, "tray_type": "PLA", "tray_color": "FFFFFFFF", "tray_info_idx": "GFA00"},
                    {"id": 1, "tray_type": "PETG", "tray_color": "000000FF", "tray_info_idx": "GFG02"},
                    {"id": 2, "tray_type": "PLA", "tray_color": "5F6367FF", "tray_info_idx": "GFA06"},
                    {"id": 3, "tray_type": "PLA", "tray_color": "B39B84FF", "tray_info_idx": "GFA02"},
                ],
            },
            {
                "id": 128,
                "tray": [{"id": 0}],  # AMS-HT, empty
            },
            {
                "id": 2,
                "tray": [
                    {"id": 0, "tray_type": "PLA-S", "tray_color": "FFFFFFFF", "tray_info_idx": "P8aa1726"},
                    {"id": 1, "tray_type": "PLA", "tray_color": "56B7E6FF", "tray_info_idx": "PFUS9924"},
                    {"id": 2, "tray_type": "PETG", "tray_color": "6EE53CFF", "tray_info_idx": "GFG02"},
                    {"id": 3, "tray_type": "PLA", "tray_color": "FF0000FF", "tray_info_idx": "PFUS9ac9"},
                ],
            },
        ],
        "vt_tray": [
            {"id": 254, "tray_type": "PLA", "tray_color": "000000FF", "tray_info_idx": "P4d64437"},
            {"id": 255, "tray_type": "", "tray_color": "00000000"},  # empty
        ],
        "ams_extruder_map": {"0": 1, "1": 0, "2": 1, "128": 0},
    }


def _x1c_raw_data():
    """X1C real data fixture (from live API response 2026-02-18).

    Configuration:
        Single nozzle (extruder 0): AMS 0 (4-slot, all empty), AMS 1 (4-slot, 3 loaded)
        External: 254 (single, empty)

    ams_extruder_map: {"0": 0, "1": 0}  ← NOT empty, all on extruder 0
    """
    return {
        "ams": [
            {
                "id": 0,
                "tray": [
                    {"id": 0},  # empty
                    {"id": 1},  # empty
                    {"id": 2},  # empty
                    {"id": 3},  # empty
                ],
            },
            {
                "id": 1,
                "tray": [
                    {"id": 0},  # empty
                    {"id": 1, "tray_type": "PLA", "tray_color": "EBCFA6FF", "tray_info_idx": "PFUS22b2"},
                    {"id": 2, "tray_type": "PLA", "tray_color": "FCECD6FF", "tray_info_idx": "P4d64437"},
                    {"id": 3, "tray_type": "PLA", "tray_color": "0066FFFF", "tray_info_idx": "P4d64437"},
                ],
            },
        ],
        "vt_tray": [
            {"id": 254, "tray_type": "", "tray_color": "00000000"},  # empty
        ],
        "ams_extruder_map": {"0": 0, "1": 0},
    }


class TestH2DModel:
    """H2D-specific tests with real printer data (dual nozzle, AMS-HT)."""

    @pytest.fixture
    def scheduler(self):
        return PrintScheduler()

    def test_build_loaded_filaments_h2d(self, scheduler):
        """H2D: correct extruder_id, global_tray_id, AMS-HT handling."""

        class MockStatus:
            raw_data = _h2d_raw_data()

        result = scheduler._build_loaded_filaments(MockStatus())

        # Should have 13 loaded filaments (4 + 4 + 0 + 4 + 1 external)
        assert len(result) == 13

        # AMS 0 trays → extruder 1 (LEFT)
        ams0 = [f for f in result if f["ams_id"] == 0]
        assert len(ams0) == 4
        assert all(f["extruder_id"] == 1 for f in ams0)
        assert [f["global_tray_id"] for f in ams0] == [0, 1, 2, 3]

        # AMS 1 trays → extruder 0 (RIGHT)
        ams1 = [f for f in result if f["ams_id"] == 1]
        assert len(ams1) == 4
        assert all(f["extruder_id"] == 0 for f in ams1)
        assert [f["global_tray_id"] for f in ams1] == [4, 5, 6, 7]

        # AMS-HT 128 → empty, should not appear
        ams_ht = [f for f in result if f["ams_id"] == 128]
        assert len(ams_ht) == 0

        # AMS 2 trays → extruder 1 (LEFT)
        ams2 = [f for f in result if f["ams_id"] == 2]
        assert len(ams2) == 4
        assert all(f["extruder_id"] == 1 for f in ams2)
        assert [f["global_tray_id"] for f in ams2] == [8, 9, 10, 11]

    def test_external_spool_extruder_h2d(self, scheduler):
        """H2D: Ext-L (254) = LEFT (extruder 1), Ext-R (255) = RIGHT (extruder 0)."""

        class MockStatus:
            raw_data = _h2d_raw_data()

        result = scheduler._build_loaded_filaments(MockStatus())
        ext = [f for f in result if f["is_external"]]
        assert len(ext) == 1  # Only 254 has filament
        assert ext[0]["global_tray_id"] == 254
        # Ext-L (254) should be LEFT nozzle (extruder 1)
        assert ext[0]["extruder_id"] == 1

    def test_match_left_nozzle_only(self, scheduler):
        """H2D: left-nozzle requirement only matches left-nozzle AMS."""

        class MockStatus:
            raw_data = _h2d_raw_data()

        loaded = scheduler._build_loaded_filaments(MockStatus())
        required = [
            {"slot_id": 1, "type": "PLA", "color": "#000000", "nozzle_id": 1},  # LEFT
        ]
        result = scheduler._match_filaments_to_slots(required, loaded)
        # Black PLA on LEFT: AMS 0 T4 (global 3)
        assert result == [3]

    def test_match_right_nozzle_only(self, scheduler):
        """H2D: right-nozzle requirement only matches right-nozzle AMS."""

        class MockStatus:
            raw_data = _h2d_raw_data()

        loaded = scheduler._build_loaded_filaments(MockStatus())
        required = [
            {"slot_id": 1, "type": "PLA", "color": "#FFFFFF", "nozzle_id": 0},  # RIGHT
        ]
        result = scheduler._match_filaments_to_slots(required, loaded)
        # White PLA on RIGHT: AMS 1 T1 (global 4)
        assert result == [4]

    def test_reject_cross_nozzle(self, scheduler):
        """H2D: hard filter rejects cross-nozzle assignment."""

        class MockStatus:
            raw_data = _h2d_raw_data()

        loaded = scheduler._build_loaded_filaments(MockStatus())
        # PLA-S only exists on AMS 2 T1 (LEFT), require on RIGHT
        required = [
            {"slot_id": 1, "type": "PLA-S", "color": "#FFFFFF", "nozzle_id": 0},
        ]
        result = scheduler._match_filaments_to_slots(required, loaded)
        assert result == [-1]  # No fallback to wrong nozzle

    def test_dual_nozzle_multi_filament(self, scheduler):
        """H2D: multi-filament print maps to correct nozzles."""

        class MockStatus:
            raw_data = _h2d_raw_data()

        loaded = scheduler._build_loaded_filaments(MockStatus())
        required = [
            {"slot_id": 1, "type": "PETG", "color": "#FFFFFF", "nozzle_id": 1, "tray_info_idx": "GFG02"},
            {"slot_id": 2, "type": "PLA", "color": "#FFFFFF", "nozzle_id": 0, "tray_info_idx": "GFA00"},
        ]
        result = scheduler._match_filaments_to_slots(required, loaded)
        # PETG white on LEFT: AMS 0 T1 (global 0)
        # PLA white on RIGHT: AMS 1 T1 (global 4)
        assert result == [0, 4]

    def test_external_spool_matches_on_correct_nozzle(self, scheduler):
        """H2D: external spool on left nozzle matches left-nozzle requirement."""

        class MockStatus:
            raw_data = _h2d_raw_data()

        loaded = scheduler._build_loaded_filaments(MockStatus())
        required = [
            {"slot_id": 1, "type": "PLA", "color": "#000000", "nozzle_id": 1, "tray_info_idx": "P4d64437"},
        ]
        result = scheduler._match_filaments_to_slots(required, loaded)
        assert result == [254]  # External spool on left nozzle


class TestX1CModel:
    """X1C-specific tests with real printer data (single nozzle, 2x regular AMS)."""

    @pytest.fixture
    def scheduler(self):
        return PrintScheduler()

    def test_build_loaded_filaments_x1c(self, scheduler):
        """X1C: all filaments on extruder 0, correct global_tray_id."""

        class MockStatus:
            raw_data = _x1c_raw_data()

        result = scheduler._build_loaded_filaments(MockStatus())

        # Only 3 loaded (AMS 1 trays 1-3)
        assert len(result) == 3
        # All on extruder 0
        assert all(f["extruder_id"] == 0 for f in result)
        # Correct global tray IDs
        assert [f["global_tray_id"] for f in result] == [5, 6, 7]

    def test_single_nozzle_no_filtering(self, scheduler):
        """X1C: single-nozzle 3MF has no nozzle_id, all trays available."""

        class MockStatus:
            raw_data = _x1c_raw_data()

        loaded = scheduler._build_loaded_filaments(MockStatus())
        required = [
            {"slot_id": 1, "type": "PLA", "color": "#0066FF"},  # No nozzle_id
        ]
        result = scheduler._match_filaments_to_slots(required, loaded)
        # Blue PLA → AMS 1 T4 (global 7)
        assert result == [7]

    def test_tray_info_idx_matching_x1c(self, scheduler):
        """X1C: tray_info_idx matching works across AMS units."""

        class MockStatus:
            raw_data = _x1c_raw_data()

        loaded = scheduler._build_loaded_filaments(MockStatus())
        required = [
            {"slot_id": 1, "type": "PLA", "color": "#EBCFA6", "tray_info_idx": "PFUS22b2"},
        ]
        result = scheduler._match_filaments_to_slots(required, loaded)
        # Unique tray_info_idx → AMS 1 T2 (global 5)
        assert result == [5]

    def test_non_unique_tray_info_idx_color_match_x1c(self, scheduler):
        """X1C: non-unique tray_info_idx falls back to color matching."""

        class MockStatus:
            raw_data = _x1c_raw_data()

        loaded = scheduler._build_loaded_filaments(MockStatus())
        # P4d64437 appears in AMS 1 T3 and T4
        required = [
            {"slot_id": 1, "type": "PLA", "color": "#FCECD6", "tray_info_idx": "P4d64437"},
        ]
        result = scheduler._match_filaments_to_slots(required, loaded)
        # Should pick AMS 1 T3 (global 6, color FCECD6) over T4 (0066FF)
        assert result == [6]

    def test_multi_filament_x1c(self, scheduler):
        """X1C: multi-filament print matches freely across AMS units."""

        class MockStatus:
            raw_data = _x1c_raw_data()

        loaded = scheduler._build_loaded_filaments(MockStatus())
        required = [
            {"slot_id": 1, "type": "PLA", "color": "#EBCFA6"},
            {"slot_id": 2, "type": "PLA", "color": "#0066FF"},
        ]
        result = scheduler._match_filaments_to_slots(required, loaded)
        assert result == [5, 7]