import unittest
from pypdf import PdfWriter, PageObject
from types import SimpleNamespace
from pdfaggregator import parse_inputs, strip_numbering, crop_page, extract_page_range, extract_section_prefix, parse_page_range, find_section_with_level, find_end_page


class TestPdfExtractionFunctions(unittest.TestCase):
    def setUp(self):
        # Dummy PDF with 5 blank pages
        self.writer = PdfWriter()
        for _ in range(5):
            self.writer.add_page(
                PageObject.create_blank_page(width=600, height=800))
        self.reader = self.writer  # pypdf writer can be used as reader for pages list
        self.content_writer = PdfWriter()
        self.outline_tree = [{"title": "Section1", "page": 0, "children": [
            {"title": "Section1.1", "page": 1, "children": []}]}]

    def test_extract_page_range(self):
        current_page, REFERENCE_BOX, toc = extract_page_range(
            "@1-3", self.reader, self.content_writer, 0, None)
        self.assertEqual(len(self.content_writer.pages), 3)  # pages 0 and 1
        self.assertEqual(toc["title"], "Pages 1-3")
        self.assertEqual(current_page, 3)

    def test_extract_section_prefix(self):
        current_page, REFERENCE_BOX, toc = extract_section_prefix(
            "Section1", self.reader, self.content_writer, 0, None, self.outline_tree)
        self.assertEqual(len(self.content_writer.pages),
                         5)  # page 0 + subsection 1
        self.assertEqual(toc["title"], "Section1")
        self.assertEqual(current_page, 5)


class TestPdfAggregator(unittest.TestCase):

    def test_parse_page_range(self):
        self.assertEqual(parse_page_range("@1-5"), [0, 1, 2, 3, 4])
        self.assertEqual(parse_page_range("@10-12"), [9, 10, 11])
        self.assertIsNone(parse_page_range("1.3"))
        self.assertIsNone(parse_page_range("Introduction-Overview"))

    def test_strip_numbering(self):
        self.assertEqual(strip_numbering("1.3 Background"), "Background")
        self.assertEqual(strip_numbering(
            "2.1.5 Experimental Setup"), "Experimental Setup")
        self.assertEqual(strip_numbering("NoNumberingHere"), "NoNumberingHere")

    def test_crop_page(self):
        page = PageObject.create_blank_page(width=600, height=800)
        crop_page(page, top_ratio=0.1, bottom_ratio=0.05)
        llx, lly = page.cropbox.lower_left
        urx, ury = page.cropbox.upper_right
        self.assertAlmostEqual(ury - lly, 800 * 0.85)


class TestParseInputs(unittest.TestCase):

    def test_single_pdf_single_section(self):
        args = SimpleNamespace(
            inputs=["doc1.pdf:1.3"]
        )

        result = parse_inputs(args)

        self.assertEqual(result, [
            {
                "file": "doc1.pdf",
                "sections": ["1.3"]
            }
        ])

    def test_single_pdf_multiple_sections(self):
        args = SimpleNamespace(
            inputs=["doc1.pdf:1.3,2.1,@10-20"]
        )

        result = parse_inputs(args)

        self.assertEqual(result, [
            {
                "file": "doc1.pdf",
                "sections": ["1.3", "2.1", "@10-20"]
            }
        ])

    def test_multiple_pdfs(self):
        args = SimpleNamespace(
            inputs=[
                "doc1.pdf:1.3,@5-10",
                "doc2.pdf:Introduction,3.2"
            ]
        )

        result = parse_inputs(args)

        self.assertEqual(result, [
            {
                "file": "doc1.pdf",
                "sections": ["1.3", "@5-10"]
            },
            {
                "file": "doc2.pdf",
                "sections": ["Introduction", "3.2"]
            }
        ])

    def test_whitespace_is_trimmed(self):
        args = SimpleNamespace(
            inputs=["doc1.pdf: 1.3 , @5-10 , Introduction "]
        )

        result = parse_inputs(args)

        self.assertEqual(result[0]["sections"], [
                         "1.3", "@5-10", "Introduction"])

    def test_missing_colon_raises_error(self):
        args = SimpleNamespace(
            inputs=["doc1.pdf"]
        )

        with self.assertRaises(ValueError):
            parse_inputs(args)


if __name__ == "__main__":
    unittest.main()