from __future__ import annotations

from headroom.providers.proxy_targets import (
    api_target,
    select_passthrough_base_url,
    vertex_target_for_location,
)
from headroom.providers.registry import DEFAULT_VERTEX_API_URL


def _proxy(**legacy_targets: str):
    class Runtime:
        @staticmethod
        def api_target(provider: str) -> str:
            return f"https://runtime.{provider}.test"

        @staticmethod
        def model_metadata_provider(headers) -> str:  # type: ignore[no-untyped-def]
            return "anthropic" if headers.get("x-api-key") else "openai"

    return type("Proxy", (), {**legacy_targets, "provider_runtime": Runtime()})()


def test_api_target_prefers_legacy_proxy_attrs() -> None:
    proxy = _proxy(ANTHROPIC_API_URL="https://legacy.anthropic.test")

    assert api_target(proxy, "anthropic") == "https://legacy.anthropic.test"
    assert api_target(proxy, "openai") == "https://runtime.openai.test"


def test_vertex_target_for_location_derives_region_when_default_configured() -> None:
    proxy = _proxy(VERTEX_API_URL=DEFAULT_VERTEX_API_URL)

    assert vertex_target_for_location(proxy, "europe-west1") == (
        "https://europe-west1-aiplatform.googleapis.com"
    )
    assert vertex_target_for_location(proxy, "global") == "https://aiplatform.googleapis.com"


def test_vertex_target_for_location_honors_explicit_gateway() -> None:
    proxy = _proxy(VERTEX_API_URL="https://vertex-gateway.example")

    assert vertex_target_for_location(proxy, "europe-west1") == "https://vertex-gateway.example"


def test_select_passthrough_base_url_handles_special_auth_modes() -> None:
    proxy = _proxy(
        ANTHROPIC_API_URL="https://legacy.anthropic.test",
        OPENAI_API_URL="https://legacy.openai.test",
        GEMINI_API_URL="https://legacy.gemini.test",
    )

    assert select_passthrough_base_url(proxy, {"chatgpt-account-id": "acct"}) == (
        "https://chatgpt.com"
    )
    assert select_passthrough_base_url(proxy, {"x-goog-api-key": "test"}) == (
        "https://legacy.gemini.test"
    )
    assert (
        select_passthrough_base_url(
            proxy,
            {"api-key": "azure", "x-headroom-base-url": "https://azure.example/base/"},
        )
        == "https://azure.example/base"
    )
    assert select_passthrough_base_url(proxy, {"x-api-key": "anthropic"}) == (
        "https://legacy.anthropic.test"
    )
    assert select_passthrough_base_url(proxy, {}) == "https://legacy.openai.test"