import tempfile
from pathlib import Path
from unittest.mock import AsyncMock, Mock

import pytest

from xyra.request import Request
from xyra.response import Response


@pytest.mark.asyncio
async def test_file_upload_basic():
    """Test basic file upload functionality."""
    uploaded_files = []

    async def upload_handler(req: Request, res: Response):
        # Simulate file upload handling
        if req.is_form():
            form_data = await req.form()
            # In real implementation, files would be parsed from multipart data
            uploaded_files.append(form_data)
            res.json({"uploaded": True, "files": len(uploaded_files)})
        else:
            res.status(400).json({"error": "Expected form data"})

    # Mock form data
    mock_req = Mock()
    mock_req.get_method.return_value = "POST"
    mock_req.get_url.return_value = "http://localhost:8000/upload"
    mock_req.for_each_header = Mock(
        side_effect=lambda func: func(
            "content-type", "application/x-www-form-urlencoded"
        )
    )

    mock_res = Mock()
    mock_res.get_data = AsyncMock(return_value=b"name=value&file=data")
    mock_res.get_json = AsyncMock(return_value={"name": "value", "file": "data"})

    request = Request(mock_req, mock_res)
    response = Response(mock_res)

    # Call the handler
    await upload_handler(request, response)

    # Check response
    assert response.status_code == 200
    assert len(uploaded_files) == 1


@pytest.mark.asyncio
async def test_file_upload_with_validation():
    """Test file upload with size and type validation."""

    async def validated_upload(req: Request, res: Response):
        if not req.is_form():
            return res.status(400).json({"error": "Expected form data"})

        # Simulate validation
        content_length = req.content_length
        if content_length and content_length > 1024 * 1024:  # 1MB limit
            return res.status(400).json({"error": "File too large"})

        content_type = req.content_type
        if not content_type or "application/x-www-form-urlencoded" not in content_type:
            return res.status(400).json({"error": "Invalid content type"})

        res.json({"status": "validated"})

    # Test with valid content
    mock_req = Mock()
    mock_req.get_method.return_value = "POST"
    mock_req.get_url.return_value = "http://localhost:8000/upload/validated"
    mock_req.for_each_header = Mock(
        side_effect=lambda func: [
            func("content-type", "application/x-www-form-urlencoded"),
            func("content-length", "512"),
        ]
    )

    mock_res = Mock()
    request = Request(mock_req, mock_res)
    response = Response(mock_res)

    await validated_upload(request, response)
    assert response.status_code == 200


@pytest.mark.asyncio
async def test_file_upload_multiple_files():
    """Test uploading multiple files."""

    async def multiple_upload(req: Request, res: Response):
        if req.is_form():
            # Simulate multiple file handling
            form_data = await req.form()
            file_count = len([k for k in form_data.keys() if k.startswith("file")])
            res.json({"uploaded": file_count, "message": "Multiple files uploaded"})
        else:
            res.status(400).json({"error": "Expected form data"})

    mock_req = Mock()
    mock_req.get_method.return_value = "POST"
    mock_req.get_url.return_value = "http://localhost:8000/upload/multiple"
    mock_req.for_each_header = Mock(
        side_effect=lambda func: func(
            "content-type", "application/x-www-form-urlencoded"
        )
    )

    mock_res = Mock()
    mock_res.get_data = AsyncMock(return_value=b"file1=data1&file2=data2")
    mock_res.get_json = AsyncMock(return_value={"file1": "data1", "file2": "data2"})

    request = Request(mock_req, mock_res)
    response = Response(mock_res)

    await multiple_upload(request, response)
    assert response.status_code == 200


def test_file_upload_storage():
    """Test file upload storage to disk."""
    with tempfile.TemporaryDirectory() as upload_dir:
        upload_path = Path(upload_dir)

        # Simulate file storage
        test_file = upload_path / "uploaded_file.txt"
        test_file.write_text("Uploaded content")

        assert test_file.exists()
        assert test_file.read_text() == "Uploaded content"


@pytest.mark.asyncio
async def test_file_upload_error_handling():
    """Test error handling during file upload."""

    async def error_upload(req: Request, res: Response):
        try:
            if req.is_form():
                # Simulate processing error
                raise Exception("Disk full")
            else:
                res.status(400).json({"error": "Expected form data"})
        except Exception as e:
            res.status(500).json({"error": str(e)})

    mock_req = Mock()
    mock_req.get_method.return_value = "POST"
    mock_req.get_url.return_value = "http://localhost:8000/upload/error"
    mock_req.for_each_header = Mock(
        side_effect=lambda func: func(
            "content-type", "application/x-www-form-urlencoded"
        )
    )

    mock_res = Mock()
    mock_res.get_data = AsyncMock(side_effect=Exception("Disk full"))

    request = Request(mock_req, mock_res)
    response = Response(mock_res)

    await error_upload(request, response)
    assert response.status(500)


def test_file_upload_security():
    """Test security aspects of file upload."""
    # Test file extension validation
    allowed_extensions = {".txt", ".jpg", ".png"}

    test_files = [
        ("safe.txt", True),
        ("image.jpg", True),
        ("script.exe", False),
        ("malicious.php", False),
        ("noextension", False),
    ]

    for filename, should_allow in test_files:
        ext = Path(filename).suffix.lower()
        is_allowed = ext in allowed_extensions
        assert is_allowed == should_allow, (
            f"File {filename} should {'be allowed' if should_allow else 'be blocked'}"
        )


@pytest.mark.asyncio
async def test_file_upload_mime_type_validation():
    """Test MIME type validation for uploads."""

    allowed_mime_types = {"text/plain", "image/jpeg", "image/png"}

    async def mime_upload(req: Request, res: Response):
        content_type = req.content_type
        if content_type and content_type in allowed_mime_types:
            res.json({"status": "accepted", "mime_type": content_type})
        else:
            res.status(400).json({"error": "Unsupported MIME type"})

    # Test allowed MIME type
    mock_req = Mock()
    mock_req.get_method.return_value = "POST"
    mock_req.get_url.return_value = "http://localhost:8000/upload/mime"
    mock_req.for_each_header = Mock(
        side_effect=lambda func: func("content-type", "image/jpeg")
    )

    mock_res = Mock()
    request = Request(mock_req, mock_res)
    response = Response(mock_res)

    await mime_upload(request, response)
    assert response.status_code == 200


def test_file_upload_chunked():
    """Test chunked file upload handling."""
    # Simulate chunked upload
    chunks = [b"chunk1", b"chunk2", b"chunk3"]
    complete_data = b"".join(chunks)

    assert len(complete_data) == 18  # chunk1 + chunk2 + chunk3
    assert complete_data == b"chunk1chunk2chunk3"


@pytest.mark.asyncio
async def test_file_upload_progress():
    """Test upload progress tracking."""

    progress_updates = []

    async def progress_upload(req: Request, res: Response):
        # Simulate progress tracking
        total_size = req.content_length or 0
        progress_updates.append(f"Upload started: {total_size} bytes")

        # In real implementation, progress would be tracked during parsing
        progress_updates.append("Upload completed")

        res.json({"progress": progress_updates})

    mock_req = Mock()
    mock_req.get_method.return_value = "POST"
    mock_req.get_url.return_value = "http://localhost:8000/upload/progress"
    mock_req.for_each_header = Mock(
        side_effect=lambda func: [
            func("content-type", "application/x-www-form-urlencoded"),
            func("content-length", "1024"),
        ]
    )

    mock_res = Mock()
    request = Request(mock_req, mock_res)
    response = Response(mock_res)

    await progress_upload(request, response)
    assert response.status_code == 200
    assert "Upload started" in progress_updates[0]
    assert "Upload completed" in progress_updates[1]


def test_file_upload_cleanup():
    """Test cleanup after failed upload."""
    with tempfile.TemporaryDirectory() as temp_dir:
        temp_file = Path(temp_dir) / "partial_upload.tmp"
        temp_file.write_text("partial data")

        # Simulate cleanup
        if temp_file.exists():
            temp_file.unlink()

        assert not temp_file.exists()
