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import asyncio
import json

from fastapi.testclient import TestClient

from pluto.doc_index import ChunkMeta, DocIndex
from pluto.models import ChunkPlan, ChunkType, FinalAnswer, FinalOutput, Priority, TraceSummary
import pluto.server as server


def test_server_blocks_run_while_background_understanding(monkeypatch):
    temp_index = DocIndex()
    temp_index.register_doc(
        doc_id="paper",
        filename="paper.md",
        chunks=["chunk text"],
        chunk_meta=[ChunkMeta(chunk_id="C0", chunk_type="text", mode="MODE_REASONING")],
    )
    temp_index.mark_processing("paper")

    monkeypatch.setattr(server, "_doc_index", temp_index)

    client = TestClient(server.app)
    response = client.post("/api/run", json={"query": "what is this paper about"})

    assert response.status_code == 409
    payload = response.json()
    assert "Please wait" in payload["error"]
    assert payload["processing_docs"] == ["paper"]


def test_server_compare_returns_json_error_payload(monkeypatch):
    import benchmark.compare as compare_module

    class BrokenRunner:
        def __init__(self, *args, **kwargs):
            pass

        def compare(self, query: str, selected_doc_ids=None, detail_level="standard"):
            raise RuntimeError("benchmark exploded")

    monkeypatch.setattr(compare_module, "ComparisonRunner", BrokenRunner)

    client = TestClient(server.app)
    response = client.post("/api/compare", json={"query": "what is this paper about"})

    assert response.status_code == 200
    assert response.json()["error"] == "Benchmark error: benchmark exploded"


def test_server_run_forwards_selected_docs_and_detail_level(monkeypatch):
    recorded = {}

    class FakeCache:
        def stats(self):
            return {"hits": 0, "misses": 0}

    class FakeRunner:
        def __init__(self, *args, **kwargs):
            self.cache = FakeCache()

        def on_progress(self, callback):
            recorded["progress_callback_registered"] = callable(callback)

        def run(self, query: str, selected_doc_ids=None, detail_level="standard"):
            recorded["query"] = query
            recorded["selected_doc_ids"] = selected_doc_ids
            recorded["detail_level"] = detail_level
            return FinalOutput(
                final_answer=FinalAnswer(response="ok", sections=[]),
                evidence=[],
                trace_summary=TraceSummary(),
                confidence=0.9,
            )

    monkeypatch.setattr(server, "PipelineRunner", FakeRunner)
    monkeypatch.setattr(server, "_doc_index", DocIndex())

    client = TestClient(server.app)
    response = client.post(
        "/api/run",
        json={
            "query": "summarize this",
            "selected_doc_ids": ["paper_a"],
            "detail_level": "detailed",
        },
    )

    assert response.status_code == 200
    assert response.json()["session_id"]
    assert recorded["progress_callback_registered"] is True
    assert recorded["query"] == "summarize this"
    assert recorded["selected_doc_ids"] == ["paper_a"]
    assert recorded["detail_level"] == "detailed"


def test_server_compare_forwards_selected_docs_and_detail_level(monkeypatch):
    import benchmark.compare as compare_module

    recorded = {}

    class FakeRunner:
        def __init__(self, *args, **kwargs):
            pass

        def compare(self, query: str, selected_doc_ids=None, detail_level="standard"):
            recorded["query"] = query
            recorded["selected_doc_ids"] = selected_doc_ids
            recorded["detail_level"] = detail_level
            return {
                "query": query,
                "pluto": {"confidence": 1.0},
                "baseline": {"confidence": 0.5},
                "winner": "Pluto",
            }

    monkeypatch.setattr(compare_module, "ComparisonRunner", FakeRunner)
    monkeypatch.setattr(server, "_doc_index", DocIndex())

    client = TestClient(server.app)
    response = client.post(
        "/api/compare",
        json={
            "query": "summarize this",
            "selected_doc_ids": ["paper_a", "paper_b"],
            "detail_level": "detailed",
        },
    )

    assert response.status_code == 200
    assert response.json()["winner"] == "Pluto"
    assert recorded["query"] == "summarize this"
    assert recorded["selected_doc_ids"] == ["paper_a", "paper_b"]
    assert recorded["detail_level"] == "detailed"


def test_server_exposes_processed_docs_as_ready_even_if_status_is_stale(monkeypatch):
    temp_index = DocIndex()
    temp_index.register_doc(
        doc_id="agentic_ai",
        filename="agentic ai.pdf",
        chunks=["chunk text"],
        chunk_meta=[ChunkMeta(chunk_id="C0", chunk_type="text", mode="MODE_REASONING")],
    )
    temp_index.set_overview("agentic_ai", "overview text")
    temp_index._docs["agentic_ai"].processing_status = "understanding"

    monkeypatch.setattr(server, "_doc_index", temp_index)

    client = TestClient(server.app)

    status_response = client.get("/api/doc-status/agentic_ai")
    corpus_response = client.get("/api/corpus")

    assert status_response.status_code == 200
    assert status_response.json()["status"] == "ready"

    documents = corpus_response.json()["documents"]
    agentic_ai = next(document for document in documents if document["doc_id"] == "agentic_ai")
    assert agentic_ai["processing_status"] == "ready"
    assert agentic_ai["is_processed"] is True


def test_stream_progress_serializes_pydantic_payloads(monkeypatch):
    session_id = "test-session"
    queue = asyncio.Queue()
    monkeypatch.setattr(server, "session_queues", {session_id: queue})
    monkeypatch.setattr(server, "session_results", {session_id: {"ok": True}})
    monkeypatch.setattr(server, "session_cleanup_tasks", {})
    queue.put_nowait({
        "stage": "done",
        "status": "complete",
        "payload": {
            "plan": [
                ChunkPlan(
                    doc_id="paper",
                    chunk_id="C0",
                    where="chunk 0",
                    chunk_type=ChunkType.TEXT,
                    mode="MODE_REASONING",
                    priority=Priority.HIGH,
                    task="Extract facts",
                )
            ]
        },
    })

    client = TestClient(server.app)
    with client.stream("GET", f"/api/stream?session_id={session_id}") as response:
        body = b"".join(response.iter_raw()).decode("utf-8")

    assert response.status_code == 200
    assert "ChunkPlan" not in body
    payload = json.loads(body.removeprefix("data: ").strip())
    assert payload["payload"]["plan"][0]["doc_id"] == "paper"
    assert payload["payload"]["plan"][0]["chunk_type"] == "text"
    assert session_id in server.session_queues
    assert session_id in server.session_results


def test_stream_progress_is_session_scoped(monkeypatch):
    first = asyncio.Queue()
    second = asyncio.Queue()
    first.put_nowait({"stage": "done", "status": "complete", "session_id": "first"})
    second.put_nowait({"stage": "done", "status": "complete", "session_id": "second"})
    monkeypatch.setattr(server, "session_queues", {"first": first, "second": second})
    monkeypatch.setattr(server, "session_results", {"first": {}, "second": {}})
    monkeypatch.setattr(server, "session_cleanup_tasks", {})

    client = TestClient(server.app)
    with client.stream("GET", "/api/stream?session_id=second") as response:
        body = b"".join(response.iter_raw()).decode("utf-8")

    payload = json.loads(body.removeprefix("data: ").strip())
    assert payload["session_id"] == "second"
    assert "first" in server.session_queues
    assert "second" in server.session_queues


def test_session_cleanup_is_delayed(monkeypatch):
    async def run_check():
        session_id = "cleanup-session"
        queue = asyncio.Queue()
        monkeypatch.setattr(server, "SESSION_CLEANUP_DELAY_SECONDS", 0.01)
        monkeypatch.setattr(server, "session_queues", {session_id: queue})
        monkeypatch.setattr(server, "session_results", {session_id: {"ok": True}})
        monkeypatch.setattr(server, "session_cleanup_tasks", {})

        server._schedule_session_cleanup(session_id, queue)

        assert session_id in server.session_queues
        assert session_id in server.session_results

        await asyncio.sleep(0.05)

        assert session_id not in server.session_queues
        assert session_id not in server.session_results

    asyncio.run(run_check())