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# Licensed under the Apache License, Version 2.0 (the "License");
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"""
Tests for InputPreprocessor.create_processor().

Why mock:
  - ModelConfig, ReasoningParserManager, ToolParserManager, and concrete processor
    classes all depend on model files or external resources not available in tests.
    We mock them at the import boundary to test InputPreprocessor's routing logic.
"""

import unittest
from types import SimpleNamespace
from unittest.mock import MagicMock, patch


def _make_model_config(arch, enable_mm=False):
    cfg = SimpleNamespace(
        model="test_model",
        architectures=[arch],
        enable_mm=enable_mm,
    )
    return cfg


class TestInputPreprocessorBranching(unittest.TestCase):
    """Test that create_processor picks the right processor class based on architecture and flags."""

    def test_init_stores_params(self):
        from fastdeploy.input.preprocess import InputPreprocessor

        config = _make_model_config("LlamaForCausalLM")
        pp = InputPreprocessor(
            model_config=config,
            reasoning_parser="qwen3",
            tool_parser="ernie_x1",
            limit_mm_per_prompt={"image": 2},
        )
        self.assertEqual(pp.model_name_or_path, "test_model")
        self.assertEqual(pp.reasoning_parser, "qwen3")
        self.assertEqual(pp.tool_parser, "ernie_x1")
        self.assertEqual(pp.limit_mm_per_prompt, {"image": 2})

    def test_create_processor_text_normal_path(self):
        """Normal path: non-Ernie, non-MM arch creates a text DataProcessor."""
        from fastdeploy.input.preprocess import InputPreprocessor

        config = _make_model_config("LlamaForCausalLM", enable_mm=False)
        pp = InputPreprocessor(model_config=config)

        mock_dp = MagicMock()
        with (
            patch.dict("sys.modules", {"fastdeploy.plugins": None, "fastdeploy.plugins.input_processor": None}),
            patch("fastdeploy.input.preprocess.envs") as mock_envs,
            patch("fastdeploy.input.text_processor.DataProcessor", return_value=mock_dp),
        ):
            mock_envs.ENABLE_V1_DATA_PROCESSOR = False
            pp.create_processor()

        self.assertIs(pp.processor, mock_dp)

    def test_unsupported_mm_arch_raises(self):
        """When enable_mm=True and arch is unrecognized, should raise ValueError."""
        from fastdeploy.input.preprocess import InputPreprocessor

        config = _make_model_config("UnknownMMArch", enable_mm=True)
        pp = InputPreprocessor(model_config=config)

        with patch.dict("sys.modules", {"fastdeploy.plugins": None, "fastdeploy.plugins.input_processor": None}):
            with self.assertRaises(ValueError):
                pp.create_processor()


if __name__ == "__main__":
    unittest.main()