import pytest
from unittest.mock import MagicMock, patch
from app import get_quantization_recipe, compress_and_upload
import gradio as gr


from llmcompressor.modifiers.quantization import QuantizationModifier, GPTQModifier
from llmcompressor.modifiers.awq import AWQModifier

# Mock external dependencies for compress_and_upload
@pytest.fixture
def mock_hf_api():
    with patch('app.HfApi') as mock_api:
        mock_api_instance = mock_api.return_value
        mock_api_instance.create_repo.return_value = "https://huggingface.co/test_user/test_model-AWQ"
        yield mock_api_instance

@pytest.fixture
def mock_whoami():
    with patch('app.whoami') as mock_whoami_func:
        mock_whoami_func.return_value = {"name": "test_user"}
        yield mock_whoami_func

@pytest.fixture
def mock_auto_model_for_causal_lm():
    with patch('app.AutoModelForCausalLM') as mock_model_class:
        mock_model_instance = MagicMock()
        mock_model_instance.config.architectures = ["LlamaForCausalLM"]
        mock_model_class.from_pretrained.return_value = mock_model_instance
        yield mock_model_class

@pytest.fixture
def mock_oneshot():
    with patch('app.oneshot') as mock_oneshot_func:
        yield mock_oneshot_func

@pytest.fixture
def mock_model_card():
    with patch('app.ModelCard') as mock_card_class:
        mock_card_instance = MagicMock()
        mock_card_class.return_value = mock_card_instance
        yield mock_card_class

@pytest.fixture
def mock_gr_oauth_token():
    mock_token = MagicMock(spec=gr.OAuthToken)
    mock_token.token = "test_token"
    return mock_token

# --- Test get_quantization_recipe ---
def test_get_quantization_recipe_awq():
    recipe = get_quantization_recipe("AWQ", "LlamaForCausalLM")
    assert len(recipe) == 1
    assert isinstance(recipe[0], AWQModifier)

def test_get_quantization_recipe_gptq():
    recipe = get_quantization_recipe("GPTQ", "LlamaForCausalLM")
    assert len(recipe) == 1
    assert isinstance(recipe[0], GPTQModifier)

def test_get_quantization_recipe_gptq_mistral():
    recipe = get_quantization_recipe("GPTQ", "MistralForCausalLM")
    assert len(recipe) == 1
    assert isinstance(recipe[0], GPTQModifier)
    assert recipe[0].sequential_targets == ["MistralDecoderLayer"]

def test_get_quantization_recipe_gptq_mixtral():
    recipe = get_quantization_recipe("GPTQ", "MixtralForCausalLM")
    assert len(recipe) == 1
    assert isinstance(recipe[0], GPTQModifier)
    assert recipe[0].sequential_targets == ["MixtralDecoderLayer"]

def test_get_quantization_recipe_fp8():
    recipe = get_quantization_recipe("FP8", "LlamaForCausalLM")
    assert len(recipe) == 1
    assert isinstance(recipe[0], QuantizationModifier)
    assert recipe[0].scheme == "FP8"
    assert recipe[0].ignore == ["lm_head"]

def test_get_quantization_recipe_fp8_mixtral():
    recipe = get_quantization_recipe("FP8", "MixtralForCausalLM")
    assert len(recipe) == 1
    assert isinstance(recipe[0], QuantizationModifier)
    assert recipe[0].scheme == "FP8"
    assert "re:.*block_sparse_moe.gate" in recipe[0].ignore

def test_get_quantization_recipe_unsupported():
    with pytest.raises(ValueError, match="Unsupported quantization method: INVALID"):
        get_quantization_recipe("INVALID", "LlamaForCausalLM")

# --- Test compress_and_upload ---
def test_compress_and_upload_no_model_id(mock_gr_oauth_token):
    with pytest.raises(gr.Error, match="Please select a model from the search bar."):
        compress_and_upload("", "AWQ", mock_gr_oauth_token)

def test_compress_and_upload_no_oauth_token():
    with pytest.raises(gr.Error, match="Authentication error. Please log in to continue."):
        compress_and_upload("test_model", "AWQ", None)

def test_compress_and_upload_success(
    mock_hf_api,
    mock_whoami,
    mock_auto_model_for_causal_lm,
    mock_oneshot,
    mock_model_card,
    mock_gr_oauth_token,
):
    model_id = "org/test_model"
    quant_method = "AWQ"
    result = compress_and_upload(model_id, quant_method, mock_gr_oauth_token)

    mock_whoami.assert_called_once_with(token="test_token")
    mock_auto_model_for_causal_lm.from_pretrained.assert_called_once_with(
        model_id, torch_dtype="auto", device_map=None, token="test_token", trust_remote_code=True
    )
    mock_oneshot.assert_called_once()
    assert mock_oneshot.call_args[1]["model"] == mock_auto_model_for_causal_lm.from_pretrained.return_value
    assert mock_oneshot.call_args[1]["recipe"] is not None
    assert mock_oneshot.call_args[1]["output_dir"] == f"test_model-{quant_method}"

    mock_hf_api.create_repo.assert_called_once_with(
        repo_id=f"test_user/test_model-{quant_method}", exist_ok=True
    )
    mock_hf_api.upload_folder.assert_called_once_with(
        folder_path=f"test_model-{quant_method}",
        repo_id=f"test_user/test_model-{quant_method}",
        commit_message=f"Upload {quant_method} compressed model",
    )
    mock_model_card.assert_called_once()
    mock_model_card.return_value.push_to_hub.assert_called_once_with(
        f"test_user/test_model-{quant_method}", token="test_token"
    )

    assert "✅ Success!" in result
    assert "https://huggingface.co/test_user/test_model-AWQ" in result

def test_compress_and_upload_with_trust_remote_code(
    mock_hf_api,
    mock_whoami,
    mock_auto_model_for_causal_lm,
    mock_oneshot,
    mock_model_card,
    mock_gr_oauth_token,
):
    model_id = "org/test_model"
    quant_method = "AWQ"
    compress_and_upload(model_id, quant_method, mock_gr_oauth_token)

    mock_auto_model_for_causal_lm.from_pretrained.assert_called_once_with(
        model_id, torch_dtype="auto", device_map=None, token="test_token", trust_remote_code=True
    )


def test_compress_and_upload_model_no_architecture(
    mock_hf_api,
    mock_whoami,
    mock_auto_model_for_causal_lm,
    mock_gr_oauth_token,
):
    mock_auto_model_for_causal_lm.from_pretrained.return_value.config.architectures = []
    with pytest.raises(gr.Error, match="Could not determine model architecture."):
        compress_and_upload("test_model", "AWQ", mock_gr_oauth_token)

def test_compress_and_upload_generic_exception(
    mock_hf_api,
    mock_whoami,
    mock_auto_model_for_causal_lm,
    mock_gr_oauth_token,
):
    mock_whoami.side_effect = Exception("Network error")
    result = compress_and_upload("test_model", "AWQ", mock_gr_oauth_token)
    assert "❌ ERROR" in result
    assert "Network error" in result

def test_compress_and_upload_unrecognized_architecture(
    mock_hf_api,
    mock_whoami,
    mock_auto_model_for_causal_lm,
    mock_gr_oauth_token,
):
    mock_auto_model_for_causal_lm.from_pretrained.return_value.config.architectures = ["UnrecognizedArchitecture"]
    result = compress_and_upload("test_model", "AWQ", mock_gr_oauth_token)
    assert "❌ ERROR" in result
    assert "AWQ quantization is only supported for LlamaForCausalLM architectures, got UnrecognizedArchitecture" in result