import pytest
from fastapi import UploadFile
from io import BytesIO
from services.document_service import document_service
import os

@pytest.fixture
def sample_pdf():
    return BytesIO(b"%PDF-1.4\n%Test PDF content")

@pytest.fixture
def sample_docx():
    return BytesIO(b"PK\x03\x04\x14\x00\x00\x00\x08\x00")

@pytest.fixture
def sample_image():
    return BytesIO(b"\x89PNG\r\n\x1a\n\x00\x00\x00\rIHDR")

@pytest.mark.asyncio
async def test_save_upload_file(sample_pdf):
    file = UploadFile(
        filename="test.pdf",
        file=sample_pdf
    )
    file_path = await document_service.save_upload_file(file)
    assert file_path.endswith("test.pdf")
    assert os.path.exists(file_path)

@pytest.mark.asyncio
async def test_process_pdf(sample_pdf):
    file = UploadFile(
        filename="test.pdf",
        file=sample_pdf
    )
    file_path = await document_service.save_upload_file(file)
    result = await document_service.process_document(file_path)
    assert "text" in result
    assert result["type"] == "pdf"

@pytest.mark.asyncio
async def test_process_docx(sample_docx):
    file = UploadFile(
        filename="test.docx",
        file=sample_docx
    )
    file_path = await document_service.save_upload_file(file)
    result = await document_service.process_document(file_path)
    assert "text" in result
    assert result["type"] == "word"

@pytest.mark.asyncio
async def test_process_image(sample_image):
    file = UploadFile(
        filename="test.png",
        file=sample_image
    )
    file_path = await document_service.save_upload_file(file)
    result = await document_service.process_document(file_path)
    assert "text" in result
    assert result["type"] == "image"

@pytest.mark.asyncio
async def test_segment_document():
    text = "Line 1\nLine 2\nLine 3\nLine 4\nLine 5"
    segments = await document_service.segment_document(text, max_segment_size=20)
    assert len(segments) > 0
    assert all(len(segment) <= 20 for segment in segments)