"""DocParser 单元测试"""

import pytest
from docx import Document
from docx.shared import Pt
from docx.enum.text import WD_ALIGN_PARAGRAPH

from exceptions import ParseError
from parsers.doc_parser import DocParser


@pytest.fixture
def parser():
    return DocParser()


def _create_docx(path, paragraphs=None, tables=None):
    """
    创建测试用 Word 文档。

    Args:
        path: 输出文件路径
        paragraphs: 列表，每个元素是 dict:
            - text: 段落文本
            - style: 可选，样式名（如 'Heading 1'）
            - font_size: 可选，字体大小 (Pt)
            - bold: 可选，是否加粗
        tables: 列表，每个元素是二维列表（行×列的文本）
    """
    doc = Document()
    # 清除默认的空段落
    for p in doc.paragraphs:
        p._element.getparent().remove(p._element)

    if paragraphs:
        for para_info in paragraphs:
            if isinstance(para_info, str):
                doc.add_paragraph(para_info)
            else:
                text = para_info.get("text", "")
                style = para_info.get("style", None)
                font_size = para_info.get("font_size", None)
                bold = para_info.get("bold", None)

                if style:
                    p = doc.add_paragraph(text, style=style)
                else:
                    p = doc.add_paragraph(text)

                if font_size is not None or bold is not None:
                    # 需要通过 run 设置字体属性
                    # 清除默认 run，重新添加
                    for run in p.runs:
                        if font_size is not None:
                            run.font.size = Pt(font_size)
                        if bold is not None:
                            run.bold = bold

    if tables:
        for table_data in tables:
            if not table_data:
                continue
            rows = len(table_data)
            cols = len(table_data[0]) if table_data else 0
            table = doc.add_table(rows=rows, cols=cols)
            for i, row_data in enumerate(table_data):
                for j, cell_text in enumerate(row_data):
                    table.rows[i].cells[j].text = cell_text

    doc.save(str(path))


class TestSupportedExtensions:
    def test_supports_docx(self, parser):
        assert ".docx" in parser.supported_extensions()

    def test_only_one_extension(self, parser):
        assert len(parser.supported_extensions()) == 1


class TestParse:
    def test_parse_simple_text(self, parser, tmp_path):
        docx_path = tmp_path / "simple.docx"
        _create_docx(docx_path, paragraphs=["Hello, world!"])
        result = parser.parse(str(docx_path))
        assert "Hello, world!" in result

    def test_parse_multiple_paragraphs(self, parser, tmp_path):
        docx_path = tmp_path / "multi.docx"
        _create_docx(docx_path, paragraphs=["First paragraph", "Second paragraph"])
        result = parser.parse(str(docx_path))
        assert "First paragraph" in result
        assert "Second paragraph" in result

    def test_heading_by_style_name(self, parser, tmp_path):
        """Heading style should produce Markdown heading"""
        docx_path = tmp_path / "heading.docx"
        _create_docx(docx_path, paragraphs=[
            {"text": "Main Title", "style": "Heading 1"},
            {"text": "Body text"},
        ])
        result = parser.parse(str(docx_path))
        assert "# Main Title" in result
        # Should be exactly H1, not H2
        assert "## Main Title" not in result

    def test_heading2_by_style_name(self, parser, tmp_path):
        docx_path = tmp_path / "h2.docx"
        _create_docx(docx_path, paragraphs=[
            {"text": "Section Title", "style": "Heading 2"},
            {"text": "Some content"},
        ])
        result = parser.parse(str(docx_path))
        assert "## Section Title" in result
        assert "### Section Title" not in result

    def test_heading3_by_style_name(self, parser, tmp_path):
        docx_path = tmp_path / "h3.docx"
        _create_docx(docx_path, paragraphs=[
            {"text": "Subsection", "style": "Heading 3"},
        ])
        result = parser.parse(str(docx_path))
        assert "### Subsection" in result

    def test_heading_by_font_size_bold(self, parser, tmp_path):
        """Bold text with large font size should be detected as heading"""
        docx_path = tmp_path / "font_heading.docx"
        _create_docx(docx_path, paragraphs=[
            {"text": "Big Bold Title", "font_size": 36, "bold": True},
            {"text": "Normal text"},
        ])
        result = parser.parse(str(docx_path))
        assert "# Big Bold Title" in result

    def test_heading_h2_by_font_size(self, parser, tmp_path):
        docx_path = tmp_path / "font_h2.docx"
        _create_docx(docx_path, paragraphs=[
            {"text": "H2 Title", "font_size": 28, "bold": True},
            {"text": "Normal text"},
        ])
        result = parser.parse(str(docx_path))
        assert "## H2 Title" in result

    def test_heading_h5_by_font_size(self, parser, tmp_path):
        docx_path = tmp_path / "font_h5.docx"
        _create_docx(docx_path, paragraphs=[
            {"text": "H5 Title", "font_size": 20, "bold": True},
            {"text": "Normal text"},
        ])
        result = parser.parse(str(docx_path))
        assert "##### H5 Title" in result

    def test_no_heading_without_bold(self, parser, tmp_path):
        """Large font without bold should NOT be detected as heading via font size"""
        docx_path = tmp_path / "no_bold.docx"
        _create_docx(docx_path, paragraphs=[
            {"text": "Large Not Bold", "font_size": 36, "bold": False},
        ])
        result = parser.parse(str(docx_path))
        assert "# Large Not Bold" not in result
        assert "Large Not Bold" in result

    def test_simple_table(self, parser, tmp_path):
        docx_path = tmp_path / "table.docx"
        _create_docx(docx_path, tables=[
            [["Name", "Age"], ["Alice", "30"], ["Bob", "25"]],
        ])
        result = parser.parse(str(docx_path))
        assert "| Name | Age |" in result
        assert "| --- | --- |" in result
        assert "| Alice | 30 |" in result
        assert "| Bob | 25 |" in result

    def test_table_with_pipe_in_cell(self, parser, tmp_path):
        """Pipe characters in cells should be escaped"""
        docx_path = tmp_path / "pipe.docx"
        _create_docx(docx_path, tables=[
            [["Header"], ["value|with|pipes"]],
        ])
        result = parser.parse(str(docx_path))
        assert "|" in result
        assert "value|with|pipes" in result

    def test_mixed_paragraphs_and_tables(self, parser, tmp_path):
        """Document with both paragraphs and tables"""
        docx_path = tmp_path / "mixed.docx"
        doc = Document()
        # Clear default paragraph
        for p in doc.paragraphs:
            p._element.getparent().remove(p._element)

        doc.add_paragraph("Introduction", style="Heading 1")
        doc.add_paragraph("Some intro text.")
        table = doc.add_table(rows=2, cols=2)
        table.rows[0].cells[0].text = "Col1"
        table.rows[0].cells[1].text = "Col2"
        table.rows[1].cells[0].text = "A"
        table.rows[1].cells[1].text = "B"
        doc.add_paragraph("Conclusion")
        doc.save(str(docx_path))

        result = parser.parse(str(docx_path))
        assert "# Introduction" in result
        assert "Some intro text." in result
        assert "| Col1 | Col2 |" in result
        assert "| A | B |" in result
        assert "Conclusion" in result

    def test_empty_document(self, parser, tmp_path):
        docx_path = tmp_path / "empty.docx"
        doc = Document()
        # Clear default paragraph
        for p in doc.paragraphs:
            p._element.getparent().remove(p._element)
        doc.save(str(docx_path))
        result = parser.parse(str(docx_path))
        assert result.strip() == ""

    def test_empty_paragraphs_skipped(self, parser, tmp_path):
        docx_path = tmp_path / "empty_para.docx"
        _create_docx(docx_path, paragraphs=["", "Actual content", ""])
        result = parser.parse(str(docx_path))
        assert "Actual content" in result
        # Empty paragraphs should not produce extra lines
        assert result.strip() == "Actual content"

    def test_nonexistent_file_raises(self, parser):
        with pytest.raises(ParseError) as exc_info:
            parser.parse("/nonexistent/path/file.docx")
        assert "file.docx" in exc_info.value.file_name
        assert exc_info.value.reason != ""

    def test_corrupted_file_raises(self, parser, tmp_path):
        docx_path = tmp_path / "corrupted.docx"
        docx_path.write_bytes(b"this is not a docx file at all")
        with pytest.raises(ParseError) as exc_info:
            parser.parse(str(docx_path))
        assert "corrupted.docx" in exc_info.value.file_name

    def test_parse_error_contains_filename(self, parser):
        with pytest.raises(ParseError) as exc_info:
            parser.parse("/no/such/report.docx")
        assert exc_info.value.file_name == "report.docx"

    def test_multiple_heading_levels(self, parser, tmp_path):
        """Test document with multiple heading levels via styles"""
        docx_path = tmp_path / "levels.docx"
        _create_docx(docx_path, paragraphs=[
            {"text": "Title", "style": "Heading 1"},
            {"text": "Chapter", "style": "Heading 2"},
            {"text": "Section", "style": "Heading 3"},
            {"text": "Body text"},
        ])
        result = parser.parse(str(docx_path))
        assert "# Title" in result
        assert "## Chapter" in result
        assert "### Section" in result
        assert "Body text" in result
        # Body text should not have heading prefix
        assert "# Body text" not in result