"""Tests for part geometry assembly."""
import json
from dataclasses import FrozenInstanceError

import pymupdf
import pytest

from pdf2imos.extract.geometry import extract_geometry
from pdf2imos.extract.text import extract_text
from pdf2imos.interpret.line_classifier import classify_lines
from pdf2imos.interpret.title_block import detect_title_block, extract_title_block_info
from pdf2imos.interpret.view_segmenter import segment_views
from pdf2imos.models import (
    DimensionAnnotation,
    DimensionDirection,
    PageExtraction,
    PartGeometry,
    ViewType,
)
from pdf2imos.parse.dimensions import extract_dimensions
from pdf2imos.reconstruct.assembler import assemble_part_geometry


def make_full_pipeline(pdf_path):
    """Run full pipeline up to assembly."""
    doc = pymupdf.open(str(pdf_path))
    page = doc[0]
    page_height = page.rect.height

    geo = extract_geometry(page)
    texts = extract_text(page)
    extraction = PageExtraction(
        paths=geo.paths,
        texts=tuple(texts),
        page_width=geo.page_width,
        page_height=page_height,
    )
    title_rect, filtered = detect_title_block(extraction)
    title_info = extract_title_block_info(extraction, title_rect) if title_rect else {}
    views = segment_views(filtered)

    # Extract dimensions per view
    dims_by_view: dict[ViewType, list[DimensionAnnotation]] = {}
    for view in views:
        classified = classify_lines(list(view.paths))
        view_dims = extract_dimensions(view, classified, page_height)
        dims_by_view[view.view_type] = view_dims

    part_name = title_info.get("part_name", "unknown")
    return views, dims_by_view, part_name


class TestAssemblePartGeometry:
    def test_returns_part_geometry_or_none(self, simple_panel_pdf):
        views, dims_by_view, part_name = make_full_pipeline(simple_panel_pdf)
        result = assemble_part_geometry(views, dims_by_view, part_name)
        assert result is None or isinstance(result, PartGeometry)

    def test_panel_assembles_correctly(self, simple_panel_pdf):
        """simple_panel.pdf should assemble to ~600×720×18mm."""
        views, dims_by_view, part_name = make_full_pipeline(simple_panel_pdf)
        result = assemble_part_geometry(views, dims_by_view, part_name)

        if result is None:
            pytest.skip("Assembly returned None — insufficient dimensions")

        # Width: ~600mm ±5mm (relaxed tolerance for fixture PDF)
        assert 580 <= result.width_mm <= 650, f"Width out of range: {result.width_mm}"
        # Height: ~720mm ±5mm
        assert 700 <= result.height_mm <= 750, f"Height out of range: {result.height_mm}"
        # Depth: ~18mm ±5mm
        assert 10 <= result.depth_mm <= 30, f"Depth out of range: {result.depth_mm}"

    def test_result_is_frozen_dataclass(self, simple_panel_pdf):
        views, dims_by_view, part_name = make_full_pipeline(simple_panel_pdf)
        result = assemble_part_geometry(views, dims_by_view, part_name)
        if result is None:
            pytest.skip("Assembly returned None")
        try:
            result.width_mm = 0  # type: ignore[misc]
            msg = "Should be frozen"
            raise AssertionError(msg)
        except (FrozenInstanceError, AttributeError):
            pass

    def test_origin_is_zero(self, simple_panel_pdf):
        views, dims_by_view, part_name = make_full_pipeline(simple_panel_pdf)
        result = assemble_part_geometry(views, dims_by_view, part_name)
        if result is None:
            pytest.skip("Assembly returned None")
        assert result.origin == (0.0, 0.0, 0.0)

    def test_to_dict_serializable(self, simple_panel_pdf):
        views, dims_by_view, part_name = make_full_pipeline(simple_panel_pdf)
        result = assemble_part_geometry(views, dims_by_view, part_name)
        if result is None:
            pytest.skip("Assembly returned None")
        d = result.to_dict()
        json.dumps(d)  # Should not raise

    def test_empty_dims_returns_none(self):
        """No dimensions → returns None."""
        result = assemble_part_geometry([], {})
        assert result is None

    def test_cabinet_assembles(self, cabinet_basic_pdf):
        """cabinet_basic.pdf (600×720×400mm) assembles successfully."""
        views, dims_by_view, part_name = make_full_pipeline(cabinet_basic_pdf)
        result = assemble_part_geometry(views, dims_by_view, part_name)

        if result is None:
            pytest.skip("Assembly returned None for cabinet")

        # Cabinet is 600×720×400mm — width should be 600
        assert 580 <= result.width_mm <= 650, f"Cabinet width: {result.width_mm}"

    def test_uses_front_view_for_width_and_height(self):
        """Front view horizontal → width, vertical → height."""
        front_dims = [
            DimensionAnnotation(
                value_mm=600,
                direction=DimensionDirection.HORIZONTAL,
                dim_line_start=(0, 0),
                dim_line_end=(600, 0),
                text_bbox=(0, 0, 0, 0),
            ),
            DimensionAnnotation(
                value_mm=720,
                direction=DimensionDirection.VERTICAL,
                dim_line_start=(0, 0),
                dim_line_end=(0, 720),
                text_bbox=(0, 0, 0, 0),
            ),
        ]
        side_dims = [
            DimensionAnnotation(
                value_mm=18,
                direction=DimensionDirection.HORIZONTAL,
                dim_line_start=(0, 0),
                dim_line_end=(18, 0),
                text_bbox=(0, 0, 0, 0),
            ),
        ]
        dims = {ViewType.FRONT: front_dims, ViewType.SIDE: side_dims}
        result = assemble_part_geometry([], dims, "test_panel")

        assert result is not None
        assert result.width_mm == pytest.approx(600)
        assert result.height_mm == pytest.approx(720)
        assert result.depth_mm == pytest.approx(18)