"""Regression tests for the tool-support heuristic in stream_agent_loop.

Verifies two critical cases:
  1. local Ollama endpoints must NOT enable native tool schemas by default
     (some models terminate after one token with schemas).
  2. api.deepseek.com must still be treated as tool-capable via the host
     allow-list (_API_HOSTS), so cloud deepseek users keep working.
"""
import pytest
from src.agent_loop import _API_HOSTS, _endpoint_lookup_keys, _is_ollama_openai_compat_url
from src.llm_core import _is_ollama_native_url


def _compute_is_api_model(model: str, endpoint_url: str, endpoint_supports=None) -> bool:
    """Replicate the heuristic from stream_agent_loop without side effects."""
    model_lc = model.lower()

    model_supports_tools = any(kw in model_lc for kw in (
        "gpt-4", "gpt-5", "gpt-o", "claude", "gemini", "gemma",
        "qwen3", "qwen2.5", "mixtral", "mistral", "llama-3.1", "llama-3.2",
        "llama-3.3", "llama-4",
        "minimax", "kimi", "yi-", "phi-3", "phi-4", "command-r",
        "glm-4", "internlm", "hermes",
        "deepseek-v", "deepseek-chat",
    ))
    model_no_tools = any(kw in model_lc for kw in (
        "deepseek-r1",
        "gpt-oss",
    ))

    if endpoint_supports is True:
        return True
    if (
        endpoint_supports is False
        or model_no_tools
        or _is_ollama_native_url(endpoint_url)
        or _is_ollama_openai_compat_url(endpoint_url)
    ):
        return False
    return any(h in endpoint_url for h in _API_HOSTS) or model_supports_tools


class TestDeepSeekToolSupport:
    # --- local Ollama cases (must NOT get native tool schemas by default) ---

    def test_deepseek_r1_7b_local_ollama_no_tools(self):
        result = _compute_is_api_model(
            "deepseek-r1:7b", "http://localhost:11434/v1"
        )
        assert result is False, (
            "deepseek-r1:7b on Ollama must not enable tool schemas "
            "(Ollama returns HTTP 400 for this model)"
        )

    def test_deepseek_r1_14b_local_no_tools(self):
        assert _compute_is_api_model("deepseek-r1:14b", "http://localhost:11434/v1") is False

    def test_deepseek_r1_70b_local_no_tools(self):
        assert _compute_is_api_model("deepseek-r1:70b", "http://127.0.0.1:11434/v1") is False

    def test_deepseek_r1_via_docker_no_tools(self):
        assert _compute_is_api_model(
            "deepseek-r1:7b", "http://host.docker.internal:11434/v1"
        ) is False

    def test_qwen_local_ollama_defaults_to_fenced_tools(self):
        assert _compute_is_api_model(
            "qwen3.5:4b", "http://localhost:11434/v1"
        ) is False

    def test_gemma_local_ollama_defaults_to_fenced_tools(self):
        assert _compute_is_api_model(
            "gemma4:e4b", "http://host.docker.internal:11434/v1"
        ) is False

    def test_gpt_oss_local_openai_compat_defaults_to_fenced_tools(self):
        assert _compute_is_api_model(
            "gpt-oss-20b", "http://localhost:8000/v1"
        ) is False

    def test_qwen_native_ollama_defaults_to_fenced_tools(self):
        assert _compute_is_api_model(
            "qwen3.5:4b", "http://localhost:11434/api/chat"
        ) is False

    # --- cloud API cases (must still get tool schemas) ---

    def test_deepseek_cloud_api_gets_tools(self):
        result = _compute_is_api_model(
            "deepseek-chat", "https://api.deepseek.com/v1"
        )
        assert result is True, (
            "api.deepseek.com must be treated as tool-capable via _API_HOSTS"
        )

    def test_deepseek_v3_cloud_gets_tools(self):
        assert _compute_is_api_model("deepseek-v3", "https://api.deepseek.com/v1") is True

    def test_deepseek_v2_cloud_gets_tools(self):
        assert _compute_is_api_model("deepseek-v2.5", "https://api.deepseek.com/v1") is True

    # --- endpoint_supports override takes priority ---

    def test_endpoint_supports_true_overrides_blocklist(self):
        """A user who explicitly sets supports_tools=True on their endpoint
        can force tool schemas even for deepseek-r1 (e.g. custom server)."""
        result = _compute_is_api_model(
            "deepseek-r1:7b", "http://localhost:11434/v1", endpoint_supports=True
        )
        assert result is True

    def test_endpoint_supports_true_overrides_ollama_default(self):
        """A user can still explicitly opt a known-good Ollama endpoint into
        native schemas."""
        result = _compute_is_api_model(
            "qwen3.5:4b", "http://localhost:11434/v1", endpoint_supports=True
        )
        assert result is True

    def test_endpoint_supports_true_overrides_native_ollama_default(self):
        result = _compute_is_api_model(
            "qwen3.5:4b", "http://localhost:11434/api/chat", endpoint_supports=True
        )
        assert result is True

    def test_endpoint_supports_true_overrides_gpt_oss_default(self):
        result = _compute_is_api_model(
            "gpt-oss-20b", "http://localhost:8000/v1", endpoint_supports=True
        )
        assert result is True

    def test_endpoint_supports_false_overrides_cloud(self):
        """supports_tools=False on an endpoint gates even cloud APIs."""
        result = _compute_is_api_model(
            "deepseek-chat", "https://api.deepseek.com/v1", endpoint_supports=False
        )
        assert result is False

    # --- other local models unaffected ---

    def test_qwen_local_non_ollama_still_gets_tools(self):
        assert _compute_is_api_model("qwen2.5:14b", "http://localhost:8000/v1") is True

    def test_llama_local_non_ollama_gets_tools_via_host(self):
        assert _compute_is_api_model("llama3.2:3b", "http://localhost:8000/v1") is True


class TestApiHostsContainsDeepSeek:
    def test_api_deepseek_com_in_api_hosts(self):
        assert "api.deepseek.com" in _API_HOSTS

    def test_deepseek_com_in_api_hosts(self):
        assert "deepseek.com" in _API_HOSTS


class TestEndpointLookupKeys:
    def test_chat_completions_url_matches_endpoint_base(self):
        keys = _endpoint_lookup_keys("http://localhost:11434/v1/chat/completions")

        assert "http://localhost:11434/v1" in keys
        assert "http://localhost:11434/v1/" in keys

    def test_native_ollama_chat_url_matches_api_base(self):
        keys = _endpoint_lookup_keys("http://host.docker.internal:11434/api/chat")

        assert "http://host.docker.internal:11434/api" in keys