import aiohttp
import pytest

from app.backend_adapters import (
    HistoryDisabledBackendAdapter,
    HttpBackendAdapter,
    NullBackendAdapter,
    build_backend_adapter,
)


@pytest.mark.asyncio
async def test_build_backend_adapter_without_url_returns_null_adapter():
    adapter = build_backend_adapter(
        backend_url=None,
        backend_mode="auto",
        history_enabled=True,
        timeout_sec=3,
    )
    assert isinstance(adapter, NullBackendAdapter)

    assert await adapter.fetch_assistant_config("assistant_1") is None
    assert (
        await adapter.create_call_record(
            user_id=1,
            assistant_id="assistant_1",
            source="debug",
        )
        is None
    )
    assert (
        await adapter.add_transcript(
            call_id="call_1",
            turn_index=0,
            speaker="human",
            content="hi",
            start_ms=0,
            end_ms=100,
            confidence=0.9,
            duration_ms=100,
        )
        is False
    )
    assert (
        await adapter.finalize_call_record(
            call_id="call_1",
            status="connected",
            duration_seconds=2,
        )
        is False
    )
    assert await adapter.search_knowledge_context(kb_id="kb_1", query="hello", n_results=3) == []
    assert await adapter.fetch_tool_resource("tool_1") is None


@pytest.mark.asyncio
async def test_http_backend_adapter_create_call_record_posts_expected_payload(monkeypatch):
    captured = {}

    class _FakeResponse:
        def __init__(self, status=200, payload=None):
            self.status = status
            self._payload = payload if payload is not None else {}

        async def __aenter__(self):
            return self

        async def __aexit__(self, exc_type, exc, tb):
            return None

        async def json(self):
            return self._payload

        def raise_for_status(self):
            if self.status >= 400:
                raise RuntimeError("http_error")

    class _FakeClientSession:
        def __init__(self, timeout=None):
            captured["timeout"] = timeout

        async def __aenter__(self):
            return self

        async def __aexit__(self, exc_type, exc, tb):
            return None

        def post(self, url, json=None):
            captured["url"] = url
            captured["json"] = json
            return _FakeResponse(status=200, payload={"id": "call_123"})

    monkeypatch.setattr("app.backend_adapters.aiohttp.ClientSession", _FakeClientSession)

    adapter = build_backend_adapter(
        backend_url="http://localhost:8100",
        backend_mode="auto",
        history_enabled=True,
        timeout_sec=7,
    )
    assert isinstance(adapter, HttpBackendAdapter)

    call_id = await adapter.create_call_record(
        user_id=99,
        assistant_id="assistant_9",
        source="debug",
    )

    assert call_id == "call_123"
    assert captured["url"] == "http://localhost:8100/api/history"
    assert captured["json"] == {
        "user_id": 99,
        "assistant_id": "assistant_9",
        "source": "debug",
        "status": "connected",
    }
    assert isinstance(captured["timeout"], aiohttp.ClientTimeout)
    assert captured["timeout"].total == 7


@pytest.mark.asyncio
async def test_backend_mode_disabled_forces_null_even_with_url():
    adapter = build_backend_adapter(
        backend_url="http://localhost:8100",
        backend_mode="disabled",
        history_enabled=True,
        timeout_sec=7,
    )
    assert isinstance(adapter, NullBackendAdapter)


@pytest.mark.asyncio
async def test_history_disabled_wraps_backend_adapter():
    adapter = build_backend_adapter(
        backend_url="http://localhost:8100",
        backend_mode="auto",
        history_enabled=False,
        timeout_sec=7,
    )
    assert isinstance(adapter, HistoryDisabledBackendAdapter)
    assert await adapter.create_call_record(user_id=1, assistant_id="a1", source="debug") is None
    assert await adapter.add_transcript(
        call_id="c1",
        turn_index=0,
        speaker="human",
        content="hi",
        start_ms=0,
        end_ms=10,
        duration_ms=10,
    ) is False