"""Tests for MinerU markdown post-processing."""

import tempfile
from pathlib import Path

import pytest

from paperlib.config import LibraryPaths
from paperlib.converter import MinerUConverter
from paperlib.storage import PaperStorageManager


class TestMinerUPostProcess:
    """Test MinerU markdown post-processing functionality."""

    @pytest.fixture
    def temp_library(self):
        """Create a temporary library for testing."""
        temp_dir = Path("./.tmp") / f"test_postprocess_{hash(self)}"
        temp_dir.mkdir(parents=True, exist_ok=True)
        library_paths = LibraryPaths.from_root(temp_dir)
        library_paths.create_directories()
        return library_paths

    @pytest.fixture
    def converter(self, temp_library):
        """Create a MinerUConverter for testing."""
        storage_manager = PaperStorageManager(temp_library)
        return MinerUConverter(storage_manager)

    def test_image_reference_replacement(self, converter):
        """Test that image references are correctly updated."""
        # Create test markdown content with various image reference formats
        test_content = """# Test Document

Here's an image with alt text:
![Figure 1](images/03781efbc8005e66728b733052e050ccbd581e5079942e5ab8e4c3020e53540d.jpg)

Here's an image without alt text:
![](images/another_image.png)

Some text content.

Here's another image:
![Complex alt text with spaces](images/subfolder/image.svg)

This should not be changed:
![External image](https://example.com/image.jpg)

And this local reference should not change:
![Local ref](./local_images/test.png)
"""

        expected_content = """# Test Document

Here's an image with alt text:
![Figure 1](assets/03781efbc8005e66728b733052e050ccbd581e5079942e5ab8e4c3020e53540d.jpg)

Here's an image without alt text:
![](assets/another_image.png)

Some text content.

Here's another image:
![Complex alt text with spaces](assets/subfolder/image.svg)

This should not be changed:
![External image](https://example.com/image.jpg)

And this local reference should not change:
![Local ref](./local_images/test.png)
"""

        # Create temporary file
        with tempfile.NamedTemporaryFile(
            mode="w", suffix=".md", delete=False, encoding="utf-8"
        ) as tmp:
            tmp.write(test_content)
            tmp_path = Path(tmp.name)

        try:
            # Apply post-processing
            converter._post_process_markdown(tmp_path)

            # Read the result
            result_content = tmp_path.read_text(encoding="utf-8")

            # Verify image references were updated correctly
            assert "![Figure 1](assets/" in result_content
            assert "![](assets/another_image.png)" in result_content
            assert (
                "![Complex alt text with spaces](assets/subfolder/image.svg)"
                in result_content
            )

            # Verify external and local references were NOT changed
            assert "https://example.com/image.jpg" in result_content
            assert "./local_images/test.png" in result_content

            # Verify no "images/" references remain
            assert "](images/" not in result_content

        finally:
            if tmp_path.exists():
                tmp_path.unlink()

    def test_markdown_content_cleaning(self, converter):
        """Test markdown content cleaning functionality."""
        test_content = """# Title with Extra    Spaces


Here's a paragraph with     multiple    spaces.

        Indented line with tabs and spaces.


Another paragraph.



Too many blank lines above.
"""

        expected_cleaned = """# Title with Extra Spaces


Here's a paragraph with multiple spaces.

Indented line with tabs and spaces.


Another paragraph.



Too many blank lines above.
"""

        result = converter._clean_markdown_content(test_content)

        # Check that excessive whitespace within lines is cleaned
        lines = result.split("\n")
        for line in lines:
            if line.strip():  # Non-empty lines
                # Should not have multiple consecutive spaces
                assert "  " not in line or line.startswith(
                    "    "
                )  # Except for code blocks

    def test_post_process_error_handling(self, converter):
        """Test that post-processing errors don't crash conversion."""
        # Test with non-existent file
        fake_path = Path("./.tmp/nonexistent.md")

        # Should not raise exception
        converter._post_process_markdown(fake_path)

        # Test with unreadable file (permission issue simulation)
        with tempfile.NamedTemporaryFile(suffix=".md", delete=False) as tmp:
            tmp_path = Path(tmp.name)

        try:
            # Create file then make it unreadable by removing it
            tmp_path.unlink()

            # Should handle gracefully
            converter._post_process_markdown(tmp_path)

        finally:
            # Cleanup if file somehow still exists
            if tmp_path.exists():
                tmp_path.unlink()

    def test_complex_image_patterns(self, converter):
        """Test complex image reference patterns."""
        test_content = """
Various image patterns:

![](images/simple.jpg)
![Alt](images/with-dashes.png) 
![Alt text](images/under_scores.svg)
![](images/path/with/subdirs.gif)
![Caption with (parentheses)](images/weird-name(1).jpg)
![Multi
line alt](images/multiline.png)

Non-image patterns that should not change:
[Link text](images/not-an-image)
`code with images/path`
    code block with images/reference
"""

        with tempfile.NamedTemporaryFile(
            mode="w", suffix=".md", delete=False, encoding="utf-8"
        ) as tmp:
            tmp.write(test_content)
            tmp_path = Path(tmp.name)

        try:
            converter._post_process_markdown(tmp_path)
            result = tmp_path.read_text(encoding="utf-8")

            # Verify all image references were updated
            assert "![](assets/simple.jpg)" in result
            assert "![Alt](assets/with-dashes.png)" in result
            assert "![Alt text](assets/under_scores.svg)" in result
            assert "![](assets/path/with/subdirs.gif)" in result
            assert "![Caption with (parentheses)](assets/weird-name(1).jpg)" in result

            # Verify non-image patterns were preserved
            assert "[Link text](images/not-an-image)" in result
            assert "`code with images/path`" in result
            assert (
                "code block with images/reference" in result
            )  # Leading spaces may be removed by cleaning

        finally:
            if tmp_path.exists():
                tmp_path.unlink()