"""Tests for dimension extraction."""

import pytest
import pymupdf
from pathlib import Path

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


def make_pipeline(pdf_path):
    """Run full pipeline up to dimension extraction."""
    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,
    )
    _, filtered = detect_title_block(extraction)
    views = segment_views(filtered)

    return views, page_height


class TestExtractDimensions:
    def test_returns_list(self, simple_panel_pdf):
        views, page_height = make_pipeline(simple_panel_pdf)
        if not views:
            pytest.skip("No views detected")
        view = views[0]
        classified = classify_lines(list(view.paths))
        result = extract_dimensions(view, classified, page_height)
        assert isinstance(result, list)

    def test_dimension_annotations_type(self, simple_panel_pdf):
        views, page_height = make_pipeline(simple_panel_pdf)
        if not views:
            pytest.skip("No views detected")
        view = views[0]
        classified = classify_lines(list(view.paths))
        result = extract_dimensions(view, classified, page_height)
        assert all(isinstance(d, DimensionAnnotation) for d in result)

    def test_finds_dimensions_in_largest_view(self, simple_panel_pdf):
        """The largest view (by text count) should have dimension values."""
        views, page_height = make_pipeline(simple_panel_pdf)
        if not views:
            pytest.skip("No views detected")
        # Pick the view with the most texts (most likely the main dimensioned view)
        main_view = max(views, key=lambda v: len(v.texts))
        if not main_view.texts:
            pytest.skip("No texts in any view")
        classified = classify_lines(list(main_view.paths))
        result = extract_dimensions(main_view, classified, page_height)
        assert len(result) > 0, (
            f"No dimensions found in {main_view.view_type.value} view "
            f"({len(main_view.texts)} texts, {len(main_view.paths)} paths)"
        )

    def test_dimension_values_reasonable(self, simple_panel_pdf):
        """Dimension values should be positive and reasonable (1-3000mm range)."""
        views, page_height = make_pipeline(simple_panel_pdf)
        for view in views:
            classified = classify_lines(list(view.paths))
            dims = extract_dimensions(view, classified, page_height)
            for d in dims:
                assert d.value_mm > 0, f"Negative dimension: {d.value_mm}"
                assert d.value_mm < 10000, f"Unreasonably large dimension: {d.value_mm}"

    def test_direction_is_enum(self, simple_panel_pdf):
        """Direction field is a DimensionDirection enum value."""
        views, page_height = make_pipeline(simple_panel_pdf)
        for view in views:
            classified = classify_lines(list(view.paths))
            dims = extract_dimensions(view, classified, page_height)
            for d in dims:
                assert isinstance(d.direction, DimensionDirection)

    def test_finds_600mm_or_720mm_dimension(self, simple_panel_pdf):
        """simple_panel.pdf front view should have 600 or 720mm dimensions."""
        views, page_height = make_pipeline(simple_panel_pdf)
        all_dims = []
        for view in views:
            classified = classify_lines(list(view.paths))
            all_dims.extend(extract_dimensions(view, classified, page_height))

        values = {d.value_mm for d in all_dims}
        # At least one of the main panel dimensions should be found
        assert any(
            580 <= v <= 620 or 700 <= v <= 740 or 15 <= v <= 21 for v in values
        ), f"No expected dimension found in: {sorted(values)}"

    def test_all_fixtures_processable(self, all_fixture_pdfs):
        """All fixture PDFs process without error."""
        for pdf_path in all_fixture_pdfs:
            views, page_height = make_pipeline(pdf_path)
            for view in views:
                classified = classify_lines(list(view.paths))
                dims = extract_dimensions(view, classified, page_height)
                assert isinstance(dims, list)

    def test_horizontal_vertical_present(self, simple_panel_pdf):
        """Both H and V dimensions expected in a panel drawing."""
        views, page_height = make_pipeline(simple_panel_pdf)
        all_dims = []
        for view in views:
            classified = classify_lines(list(view.paths))
            all_dims.extend(extract_dimensions(view, classified, page_height))

        if not all_dims:
            pytest.skip("No dimensions extracted")
        directions = {d.direction for d in all_dims}
        # Should have at least one direction type
        assert len(directions) > 0