import pytest
from fastapi.testclient import TestClient
from app.main import app
from io import BytesIO

client = TestClient(app)

def test_size_comparison_success():
    # Create a test image file
    test_image = BytesIO(b"fake image data")
    test_image.name = "test_image.jpg"
    
    # Test data
    files = {
        "garment_images": ("test_image.jpg", test_image, "image/jpeg")
    }
    data = {
        "product_height": 30.0,
        "product_width": 20.0,
        "product_length": 15.0
    }
    
    response = client.post("/api/v1/size", files=files, data=data)
    assert response.status_code == 200
    assert response.headers["content-type"] == "image/png"

def test_size_comparison_invalid_dimensions():
    test_image = BytesIO(b"fake image data")
    test_image.name = "test_image.jpg"
    
    files = {
        "garment_images": ("test_image.jpg", test_image, "image/jpeg")
    }
    data = {
        "product_height": "invalid",  # Invalid height
        "product_width": 20.0,
        "product_length": 15.0
    }
    
    response = client.post("/api/v1/size", files=files, data=data)
    assert response.status_code == 400
    assert "Invalid dimensions" in response.json()["detail"]

def test_size_comparison_invalid_file_type():
    test_file = BytesIO(b"not an image")
    test_file.name = "test.txt"
    
    files = {
        "garment_images": ("test.txt", test_file, "text/plain")
    }
    data = {
        "product_height": 30.0,
        "product_width": 20.0,
        "product_length": 15.0
    }
    
    response = client.post("/api/v1/size", files=files, data=data)
    assert response.status_code == 400
    assert "Invalid file type" in response.json()["detail"]

def test_size_comparison_missing_file():
    data = {
        "product_height": 30.0,
        "product_width": 20.0,
        "product_length": 15.0
    }
    
    response = client.post("/api/v1/size", data=data)
    assert response.status_code == 422  # FastAPI validation error

def test_size_comparison_multiple_files():
    test_image1 = BytesIO(b"fake image data 1")
    test_image1.name = "test_image1.jpg"
    test_image2 = BytesIO(b"fake image data 2")
    test_image2.name = "test_image2.jpg"
    
    files = [
        ("garment_images", ("test_image1.jpg", test_image1, "image/jpeg")),
        ("garment_images", ("test_image2.jpg", test_image2, "image/jpeg"))
    ]
    data = {
        "product_height": 30.0,
        "product_width": 20.0,
        "product_length": 15.0
    }
    
    response = client.post("/api/v1/size", files=files, data=data)
    assert response.status_code == 400
    assert "Exactly one front shot of the image" in response.json()["detail"]