"""Behavior pins for ``proxy_server.py`` model routes.

Pins (PR2):
    - GET /v1/models
    - GET /models
    - GET /v1/models/{model_id}
    - GET /models/{model_id}
"""

from __future__ import annotations

from unittest.mock import MagicMock

import pytest

import litellm
from litellm.proxy import proxy_server
from litellm.proxy import utils as proxy_utils
from litellm.proxy.utils import create_model_info_response
from litellm.types.router import DeploymentModelListingInfo

from .conftest import normalize  # type: ignore[import-not-found]


def _stub_model_info_response(
    model_id: str = "gpt-4", provider: str = "openai"
) -> dict:
    return {
        "id": model_id,
        "object": "model",
        "created": 0,
        "owned_by": provider,
    }


@pytest.fixture
def patched_models(monkeypatch):
    """Stub router + utility helpers used by the /models routes."""
    from litellm.proxy import utils as proxy_utils

    router = MagicMock()
    router.get_fully_blocked_model_names = MagicMock(return_value=set())
    router.get_model_names = MagicMock(return_value=["gpt-4", "claude-sonnet"])
    router.get_model_access_groups = MagicMock(return_value={})

    deployment = MagicMock()
    deployment.litellm_params.model = "gpt-4"
    router.get_deployment_by_model_group_name = MagicMock(return_value=deployment)
    router.get_routable_upstream_model = MagicMock(return_value="gpt-4")
    router.get_configured_display_name = MagicMock(return_value=None)
    router.get_configured_service_tiers = MagicMock(return_value=())

    monkeypatch.setattr(proxy_server, "llm_router", router)
    monkeypatch.setattr(proxy_server, "prisma_client", MagicMock())

    async def _fake_get_available_models_for_user(**kwargs):
        return ["gpt-4", "claude-sonnet"]

    monkeypatch.setattr(
        proxy_utils,
        "get_available_models_for_user",
        _fake_get_available_models_for_user,
    )

    def _fake_create_model_info_response(model_id, provider="openai", **kwargs):
        return _stub_model_info_response(model_id=model_id, provider=provider)

    monkeypatch.setattr(
        proxy_utils, "create_model_info_response", _fake_create_model_info_response
    )

    monkeypatch.setattr(proxy_utils, "validate_model_access", lambda **kwargs: None)

    monkeypatch.setattr(
        litellm,
        "get_llm_provider",
        lambda model: (model, "openai", None, None),
    )

    return router


@pytest.mark.parametrize("path", ["/v1/models", "/models"])
def test_get_models_happy_path(client, auth_as, patched_models, path):
    """Pins: ``GET /v1/models``, ``GET /models``."""
    with auth_as():
        response = client.get(path)
    assert response.status_code == 200
    assert normalize(response.json()) == {
        "data": [
            {
                "id": "<VOLATILE>",
                "object": "model",
                "created": "<VOLATILE>",
                "owned_by": "openai",
            },
            {
                "id": "<VOLATILE>",
                "object": "model",
                "created": "<VOLATILE>",
                "owned_by": "openai",
            },
        ],
        "object": "list",
    }


@pytest.mark.parametrize("path", ["/v1/models", "/models"])
def test_get_models_anthropic_format_when_header_present(
    client, auth_as, patched_models, path
):
    """Pins: ``GET /v1/models`` returns the Anthropic-native models shape when
    the caller sends an ``anthropic-version`` header (Claude Code gateway
    discovery), while the default OpenAI shape is unchanged without it."""
    with auth_as():
        response = client.get(path, headers={"anthropic-version": "2023-06-01"})
    assert response.status_code == 200
    body = response.json()
    assert "object" not in body
    assert body["has_more"] is False
    assert body["first_id"] == "gpt-4"
    assert body["last_id"] == "claude-sonnet"
    assert [m["id"] for m in body["data"]] == ["gpt-4", "claude-sonnet"]
    for entry in body["data"]:
        assert entry["type"] == "model"
        assert entry["display_name"] == entry["id"]
        assert entry["created_at"].endswith("Z")


@pytest.mark.parametrize("path", ["/v1/models", "/models"])
def test_anthropic_format_exposes_token_limits(
    client, auth_as, patched_models, monkeypatch, path
):
    """Claude Code sizes requests off the listing, so the Anthropic-native entries
    carry the same token limits the OpenAI listing resolves, with the output budget
    named max_tokens as the Messages API names it."""
    from litellm.proxy import utils as proxy_utils

    def _create_model_info_response(model_id, provider="openai", **kwargs):
        if model_id != "claude-sonnet":
            return _stub_model_info_response(model_id=model_id, provider=provider)
        return {
            **_stub_model_info_response(model_id=model_id, provider=provider),
            "max_input_tokens": 200000,
            "max_output_tokens": 64000,
        }

    monkeypatch.setattr(
        proxy_utils, "create_model_info_response", _create_model_info_response
    )

    with auth_as():
        response = client.get(path, headers={"anthropic-version": "2023-06-01"})

    assert response.status_code == 200
    gpt_4, claude = response.json()["data"]
    assert claude["max_input_tokens"] == 200000
    assert claude["max_tokens"] == 64000
    assert "max_output_tokens" not in claude
    assert gpt_4["max_input_tokens"] is None
    assert gpt_4["max_tokens"] is None


@pytest.mark.parametrize("path", ["/v1/models", "/models"])
def test_anthropic_format_carries_router_configured_token_limits(client, auth_as, patched_models, monkeypatch, path):
    """Pins the whole resolution chain, not just the formatter: a deployment's
    configured limits beat the cost map, and the configured output budget is what
    lands on the Anthropic ``max_tokens``. All eight limits differ, so an entry
    built from another entry's lookup shows up as the wrong numbers."""

    def _configured(model_name):
        max_input, max_output = (300000, 32000) if model_name == "gpt-4" else (500000, 4096)
        return DeploymentModelListingInfo(
            cost_map_keys=(model_name,), max_input_tokens=max_input, max_output_tokens=max_output
        )

    def _cost_map_lookup(model_id):
        max_input, max_output = (200000, 64000) if model_id == "gpt-4" else (100000, 8000)
        return {"max_input_tokens": max_input, "max_output_tokens": max_output, "mode": "chat"}

    patched_models.get_model_listing_info = MagicMock(side_effect=_configured)

    def _resolved(**kwargs):
        return create_model_info_response(**kwargs, get_model_info=_cost_map_lookup)

    monkeypatch.setattr(proxy_utils, "create_model_info_response", _resolved)

    with auth_as():
        response = client.get(path, headers={"anthropic-version": "2023-06-01"})

    assert response.status_code == 200
    gpt_4, claude = response.json()["data"]
    assert (gpt_4["max_input_tokens"], gpt_4["max_tokens"]) == (300000, 32000)
    assert (claude["max_input_tokens"], claude["max_tokens"]) == (500000, 4096)


@pytest.mark.parametrize("path", ["/v1/models", "/models"])
def test_anthropic_format_uses_configured_display_name(client, auth_as, patched_models, path):
    """A deployment's ``model_info.display_name`` becomes the Anthropic-native
    ``display_name`` so Claude Code's picker shows a clean name while the id keeps
    routing; models without one keep the id fallback, and the OpenAI-shaped
    listing carries no display_name either way."""

    def _configured(model_name):
        return "Kimi K3" if model_name == "gpt-4" else None

    patched_models.get_configured_display_name = MagicMock(side_effect=_configured)

    with auth_as():
        anthropic_response = client.get(path, headers={"anthropic-version": "2023-06-01"})
        openai_response = client.get(path)

    assert anthropic_response.status_code == 200
    gpt_4, claude = anthropic_response.json()["data"]
    assert (gpt_4["id"], gpt_4["display_name"]) == ("gpt-4", "Kimi K3")
    assert (claude["id"], claude["display_name"]) == ("claude-sonnet", "claude-sonnet")

    assert openai_response.status_code == 200
    openai_models = openai_response.json()["data"]
    assert [m["id"] for m in openai_models] == ["gpt-4", "claude-sonnet"]
    assert all("display_name" not in m for m in openai_models)


@pytest.mark.parametrize("params", [{}, {"scope": "expand"}])
def test_anthropic_display_name_resolved_via_internal_team_key(
    client, auth_as, patched_models, monkeypatch, params
):
    """For a team-scoped row the configured display name must be looked up by the
    internal routing key while the entry itself is keyed by the public name, so
    the clean name lands on the id the client actually sees."""
    from litellm.proxy import utils as proxy_utils
    from litellm.proxy.auth import model_checks

    internal_name = "model_name_team-1_c0ffee"

    patched_models.get_model_list = MagicMock(
        return_value=[
            {
                "model_name": internal_name,
                "model_info": {
                    "team_id": "team-1",
                    "team_public_model_name": "gpt-4-team",
                },
            }
        ]
    )
    patched_models.get_model_names = MagicMock(return_value=[internal_name])
    patched_models.get_configured_display_name = MagicMock(
        side_effect=lambda model_name: "Team GPT" if model_name == internal_name else None
    )

    async def _fake_get_available_models_for_user(**kwargs):
        return [internal_name]

    monkeypatch.setattr(
        proxy_utils,
        "get_available_models_for_user",
        _fake_get_available_models_for_user,
    )
    monkeypatch.setattr(
        model_checks, "get_complete_model_list", lambda **kwargs: [internal_name]
    )

    with auth_as():
        response = client.get(
            "/v1/models", params=params, headers={"anthropic-version": "2023-06-01"}
        )

    assert response.status_code == 200
    (entry,) = response.json()["data"]
    assert (entry["id"], entry["display_name"]) == ("gpt-4-team", "Team GPT")


@pytest.mark.parametrize("path", ["/v1/models", "/models"])
def test_get_models_invalid_scope_returns_400(client, auth_as, patched_models, path):
    """Pins: ``GET /v1/models``, ``GET /models`` (error path: invalid scope)."""
    with auth_as():
        response = client.get(path, params={"scope": "not-a-real-scope"})
    assert response.status_code == 400
    assert "Invalid scope parameter" in str(response.json())


@pytest.mark.parametrize("path", ["/v1/models/gpt-4", "/models/gpt-4"])
def test_get_model_by_id_happy_path(client, auth_as, patched_models, path):
    """Pins: ``GET /v1/models/{model_id}``, ``GET /models/{model_id}``."""
    with auth_as():
        response = client.get(path)
    assert response.status_code == 200
    assert normalize(response.json()) == {
        "id": "<VOLATILE>",
        "object": "model",
        "created": "<VOLATILE>",
        "owned_by": "openai",
    }


@pytest.mark.parametrize("path", ["/v1/models/missing", "/models/missing"])
def test_get_model_by_id_not_found(client, auth_as, patched_models, path):
    """Pins: ``GET /v1/models/{model_id}``, ``GET /models/{model_id}`` (error: 404)."""
    patched_models.get_deployment_by_model_group_name = MagicMock(return_value=None)
    with auth_as():
        response = client.get(path)
    assert response.status_code == 404
    assert "not found" in response.text.lower()


@pytest.mark.parametrize("params", [{}, {"scope": "expand"}])
def test_anthropic_format_returns_public_team_model_name(
    client, auth_as, patched_models, monkeypatch, params
):
    """Regression: the Anthropic-native listing must go through the same team
    name translation as the OpenAI listing, so a caller never sees the internal
    ``model_name_{team_id}_{uuid}`` routing key."""
    from litellm.proxy import utils as proxy_utils
    from litellm.proxy.auth import model_checks

    internal_name = "model_name_team-1_c0ffee"

    patched_models.get_model_list = MagicMock(
        return_value=[
            {
                "model_name": internal_name,
                "model_info": {
                    "team_id": "team-1",
                    "team_public_model_name": "gpt-4-team",
                },
            }
        ]
    )
    patched_models.get_model_names = MagicMock(return_value=[internal_name])

    async def _fake_get_available_models_for_user(**kwargs):
        return [internal_name]

    monkeypatch.setattr(
        proxy_utils,
        "get_available_models_for_user",
        _fake_get_available_models_for_user,
    )
    monkeypatch.setattr(
        model_checks, "get_complete_model_list", lambda **kwargs: [internal_name]
    )

    with auth_as():
        response = client.get(
            "/v1/models", params=params, headers={"anthropic-version": "2023-06-01"}
        )

    assert response.status_code == 200
    assert [m["id"] for m in response.json()["data"]] == ["gpt-4-team"]
    assert internal_name not in response.text


@pytest.mark.parametrize("path", ["/v1/models", "/models"])
@pytest.mark.parametrize(
    "caller_headers",
    [
        {"anthropic-version": "2023-06-01", "user-agent": "claude-code/2.1.267"},
        {"anthropic-version": "2023-06-01", "user-agent": "claude-cli/2.1.267 (external, sdk-cli)"},
        {"anthropic-version": "2023-06-01", "x-gateway-client": "claude-code"},
    ],
)
def test_anthropic_format_lists_claude_code_view_ids_for_claude_code(
    client, auth_as, patched_models, monkeypatch, path, caller_headers
):
    """Claude Code drops every id without claude/anthropic in it and reads [1m] as its 1M marker, so for Claude
    Code (its discovery fetch's own user agent, its SDK's, or the gateway-client header a launcher sends) every
    group is listed under a Claude-shaped id with the marker where the window reaches 1M; the display name stays
    the served name."""

    def _create_model_info_response(model_id, provider="openai", **kwargs):
        if model_id != "claude-sonnet":
            return _stub_model_info_response(model_id=model_id, provider=provider)
        return {**_stub_model_info_response(model_id=model_id, provider=provider), "max_input_tokens": 1000000}

    patched_models.model_group_alias = {}
    patched_models.has_model_id.return_value = False
    patched_models.get_candidate_model_ids_for_route.side_effect = lambda name, team_id=None: frozenset({name}) if name in ("gpt-4", "claude-sonnet") else frozenset()
    monkeypatch.setattr(proxy_utils, "create_model_info_response", _create_model_info_response)

    with auth_as():
        response = client.get(path, headers=caller_headers)

    assert response.status_code == 200
    body = response.json()
    assert [(m["id"], m["display_name"]) for m in body["data"]] == [
        ("claude-router-6770742d34", "gpt-4"),
        ("claude-sonnet[1m]", "claude-sonnet"),
    ]
    assert (body["first_id"], body["last_id"]) == ("claude-router-6770742d34", "claude-sonnet[1m]")
    assert [row["source_model"] for row in body["data"]] == ["gpt-4", "claude-sonnet"]


@pytest.mark.parametrize("path", ["/v1/models", "/models"])
def test_anthropic_format_keeps_served_ids_for_other_anthropic_clients(client, auth_as, patched_models, path):
    """An Anthropic SDK asking for the vendor shape gets the served ids: the view is Claude Code's alone."""
    with auth_as():
        response = client.get(path, headers={"anthropic-version": "2023-06-01", "user-agent": "anthropic-sdk-python/0.40"})

    assert response.status_code == 200
    assert [m["id"] for m in response.json()["data"]] == ["gpt-4", "claude-sonnet"]


@pytest.mark.parametrize("path", ["/v1/models", "/models"])
@pytest.mark.parametrize("params", [{}, {"scope": "expand"}])
def test_codex_format_when_client_version_present(client, auth_as, patched_models, path, params):
    """Codex CLI fetches a provider's catalog as ``GET /v1/models?client_version=<its version>`` and
    decodes Codex's own ``{"models": [...]}`` shape; the same request without the parameter keeps the
    OpenAI shape byte for byte."""
    with auth_as():
        codex_response = client.get(path, params={**params, "client_version": "0.159.3"})
        openai_response = client.get(path, params=params)

    assert codex_response.status_code == 200
    assert codex_response.headers["content-type"] == "application/json"
    body = codex_response.json()
    assert list(body) == ["models"]
    assert [(m["slug"], m["display_name"], m["priority"]) for m in body["models"]] == [
        ("gpt-4", "gpt-4", 0),
        ("claude-sonnet", "claude-sonnet", 1),
    ]
    assert all(m["base_instructions"] and m["visibility"] == "list" for m in body["models"])

    assert openai_response.status_code == 200
    assert normalize(openai_response.json()) == {
        "data": [
            {"id": "<VOLATILE>", "object": "model", "created": "<VOLATILE>", "owned_by": "openai"},
            {"id": "<VOLATILE>", "object": "model", "created": "<VOLATILE>", "owned_by": "openai"},
        ],
        "object": "list",
    }


@pytest.mark.parametrize("path", ["/v1/models", "/models"])
def test_codex_format_wins_over_the_anthropic_header(client, auth_as, patched_models, path):
    with auth_as():
        response = client.get(path, params={"client_version": "0.159.3"}, headers={"anthropic-version": "2023-06-01"})

    assert response.status_code == 200
    assert list(response.json()) == ["models"]


@pytest.mark.parametrize("path", ["/v1/models", "/models"])
def test_codex_format_carries_configured_service_tiers(client, auth_as, patched_models, path):
    """A deployment's ``model_info.service_tiers`` becomes the entry's ``service_tiers``, which Codex
    offers as slash commands; a model without one offers none, and the OpenAI shape gains no field."""
    patched_models.get_configured_service_tiers = MagicMock(
        side_effect=lambda model_name, team_id=None: (["ultrafast"],) if model_name == "gpt-4" else (None,)
    )

    with auth_as():
        codex_response = client.get(path, params={"client_version": "0.159.3"})
        openai_response = client.get(path)

    gpt_4, claude = codex_response.json()["models"]
    assert gpt_4["service_tiers"] == [
        {"id": "ultrafast", "name": "Ultrafast", "description": "Sends service_tier=ultrafast upstream"}
    ]
    assert claude["service_tiers"] == []
    assert all("service_tiers" not in m for m in openai_response.json()["data"])


@pytest.mark.parametrize("params", [{}, {"scope": "expand"}])
def test_codex_service_tiers_are_read_for_the_key_team(client, auth_as, patched_models, params):
    """A tier and the upstream model that picks Codex's stock entry are read off the deployments the
    key's team can route to, so both listing paths hand the router the key's team, and no team for a
    key without one."""
    patched_models.get_configured_service_tiers = MagicMock(
        side_effect=lambda model_name, team_id=None: (["ultrafast"],) if team_id == "team-1" else (None,)
    )
    patched_models.get_routable_upstream_model = MagicMock(
        side_effect=lambda model_name, team_id=None: "openai/gpt-5.5" if team_id == "team-1" else "gpt-4"
    )

    with auth_as(team_id="team-1"):
        team_response = client.get("/v1/models", params={**params, "client_version": "0.159.3"})
    with auth_as():
        teamless_response = client.get("/v1/models", params={**params, "client_version": "0.159.3"})

    assert [[t["id"] for t in m["service_tiers"]] for m in team_response.json()["models"]] == [["ultrafast"]] * 2
    assert [m["service_tiers"] for m in teamless_response.json()["models"]] == [[], []]
    assert all(m["supported_reasoning_levels"] for m in team_response.json()["models"])
    assert [m["supported_reasoning_levels"] for m in teamless_response.json()["models"]] == [[], []]


@pytest.mark.parametrize("params", [{}, {"scope": "expand"}])
def test_codex_service_tiers_resolved_via_internal_team_key(client, auth_as, patched_models, monkeypatch, params):
    """A team-scoped row's tiers are looked up by the internal routing key while the entry is keyed by
    the public name Codex sends back as the model."""
    from litellm.proxy import utils as proxy_utils
    from litellm.proxy.auth import model_checks

    internal_name = "model_name_team-1_c0ffee"

    patched_models.get_model_list = MagicMock(
        return_value=[
            {"model_name": internal_name, "model_info": {"team_id": "team-1", "team_public_model_name": "gpt-4-team"}}
        ]
    )
    patched_models.get_model_names = MagicMock(return_value=[internal_name])
    patched_models.get_configured_service_tiers = MagicMock(
        side_effect=lambda model_name, team_id=None: (["ultrafast"],) if model_name == internal_name else ()
    )

    async def _fake_get_available_models_for_user(**kwargs):
        return [internal_name]

    monkeypatch.setattr(proxy_utils, "get_available_models_for_user", _fake_get_available_models_for_user)
    monkeypatch.setattr(model_checks, "get_complete_model_list", lambda **kwargs: [internal_name])

    with auth_as():
        response = client.get("/v1/models", params={**params, "client_version": "0.159.3"})

    assert response.status_code == 200
    (entry,) = response.json()["models"]
    assert (entry["slug"], [tier["id"] for tier in entry["service_tiers"]]) == ("gpt-4-team", ["ultrafast"])