"""Tests for GET /api/runs/{run_id}/messages and GET /api/runs/{run_id}/feedback endpoints."""

from __future__ import annotations

from unittest.mock import AsyncMock, MagicMock

import pytest
from _router_auth_helpers import make_authed_test_app
from _run_message_pagination_helpers import assert_run_message_page
from fastapi.testclient import TestClient

from app.gateway.routers import runs

# ---------------------------------------------------------------------------
# Helpers
# ---------------------------------------------------------------------------


def _make_app(run_store=None, event_store=None, feedback_repo=None):
    """Build a test FastAPI app with stub auth and mocked state."""
    app = make_authed_test_app()
    app.include_router(runs.router)

    if run_store is not None:
        app.state.run_store = run_store
    if event_store is not None:
        app.state.run_event_store = event_store
    if feedback_repo is not None:
        app.state.feedback_repo = feedback_repo

    return app


def _make_run_store(run_record: dict | None):
    """Return an AsyncMock run store whose get() returns run_record."""
    store = MagicMock()
    store.get = AsyncMock(return_value=run_record)
    return store


def _make_event_store(rows: list[dict]):
    """Return an AsyncMock event store whose list_messages_by_run() returns rows."""
    store = MagicMock()
    store.list_messages_by_run = AsyncMock(return_value=rows)
    return store


def _make_message(seq: int) -> dict:
    return {"seq": seq, "event_type": "on_chat_model_stream", "category": "message", "content": f"msg-{seq}"}


# ---------------------------------------------------------------------------
# Tests
# ---------------------------------------------------------------------------


def test_run_messages_returns_envelope():
    """GET /api/runs/{run_id}/messages returns {data: [...], has_more: bool}."""
    rows = [_make_message(i) for i in range(1, 4)]
    run_record = {"run_id": "run-1", "thread_id": "thread-1"}
    app = _make_app(
        run_store=_make_run_store(run_record),
        event_store=_make_event_store(rows),
    )
    with TestClient(app) as client:
        response = client.get("/api/runs/run-1/messages")
    assert response.status_code == 200
    body = response.json()
    assert "data" in body
    assert "has_more" in body
    assert body["has_more"] is False
    assert len(body["data"]) == 3


def test_run_messages_404_when_run_not_found():
    """Returns 404 when the run store returns None."""
    app = _make_app(
        run_store=_make_run_store(None),
        event_store=_make_event_store([]),
    )
    with TestClient(app) as client:
        response = client.get("/api/runs/missing-run/messages")
    assert response.status_code == 404
    assert "missing-run" in response.json()["detail"]


def test_run_messages_has_more_true_when_extra_row_returned():
    """has_more=True when event store returns limit+1 rows."""
    # Default limit is 50; provide 51 rows
    rows = [_make_message(i) for i in range(1, 52)]  # 51 rows
    run_record = {"run_id": "run-2", "thread_id": "thread-2"}
    app = _make_app(
        run_store=_make_run_store(run_record),
        event_store=_make_event_store(rows),
    )
    with TestClient(app) as client:
        response = client.get("/api/runs/run-2/messages")
    assert response.status_code == 200
    body = response.json()
    assert body["has_more"] is True
    assert len(body["data"]) == 50  # trimmed to limit
    assert [m["seq"] for m in body["data"]] == list(range(2, 52))


def test_run_messages_default_page_keeps_newest_messages_when_extra_row_returned():
    """Default latest-page trimming drops the older sentinel row, not the newest message."""
    rows = [_make_message(i) for i in range(16, 67)]
    run_record = {"run_id": "run-2", "thread_id": "thread-2"}
    app = _make_app(
        run_store=_make_run_store(run_record),
        event_store=_make_event_store(rows),
    )
    with TestClient(app) as client:
        assert_run_message_page(client, "/api/runs/run-2/messages", expected_seq=list(range(17, 67)))


def test_run_messages_before_seq_page_keeps_newest_side_when_extra_row_returned():
    """Backward pagination trims the older sentinel so adjacent pages do not miss the boundary message."""
    rows = [_make_message(i) for i in range(1, 18)]
    run_record = {"run_id": "run-2", "thread_id": "thread-2"}
    app = _make_app(
        run_store=_make_run_store(run_record),
        event_store=_make_event_store(rows),
    )
    with TestClient(app) as client:
        assert_run_message_page(
            client,
            "/api/runs/run-2/messages?before_seq=18&limit=16",
            expected_seq=list(range(2, 18)),
        )


def test_run_messages_after_seq_page_keeps_oldest_side_when_extra_row_returned():
    """Forward pagination still trims the newer sentinel row."""
    rows = [_make_message(i) for i in range(11, 62)]
    run_record = {"run_id": "run-2", "thread_id": "thread-2"}
    app = _make_app(
        run_store=_make_run_store(run_record),
        event_store=_make_event_store(rows),
    )
    with TestClient(app) as client:
        assert_run_message_page(
            client,
            "/api/runs/run-2/messages?after_seq=10",
            expected_seq=list(range(11, 61)),
        )


def test_run_messages_passes_after_seq_to_event_store():
    """after_seq query param is forwarded to event_store.list_messages_by_run."""
    rows = [_make_message(10)]
    run_record = {"run_id": "run-3", "thread_id": "thread-3"}
    event_store = _make_event_store(rows)
    app = _make_app(
        run_store=_make_run_store(run_record),
        event_store=event_store,
    )
    with TestClient(app) as client:
        response = client.get("/api/runs/run-3/messages?after_seq=5")
    assert response.status_code == 200
    event_store.list_messages_by_run.assert_awaited_once_with(
        "thread-3",
        "run-3",
        limit=51,  # default limit(50) + 1
        before_seq=None,
        after_seq=5,
    )


def test_run_messages_respects_custom_limit():
    """Custom limit is respected and capped at 200."""
    rows = [_make_message(i) for i in range(1, 6)]
    run_record = {"run_id": "run-4", "thread_id": "thread-4"}
    event_store = _make_event_store(rows)
    app = _make_app(
        run_store=_make_run_store(run_record),
        event_store=event_store,
    )
    with TestClient(app) as client:
        response = client.get("/api/runs/run-4/messages?limit=10")
    assert response.status_code == 200
    event_store.list_messages_by_run.assert_awaited_once_with(
        "thread-4",
        "run-4",
        limit=11,  # 10 + 1
        before_seq=None,
        after_seq=None,
    )


def test_run_messages_passes_before_seq_to_event_store():
    """before_seq query param is forwarded to event_store.list_messages_by_run."""
    rows = [_make_message(3)]
    run_record = {"run_id": "run-5", "thread_id": "thread-5"}
    event_store = _make_event_store(rows)
    app = _make_app(
        run_store=_make_run_store(run_record),
        event_store=event_store,
    )
    with TestClient(app) as client:
        response = client.get("/api/runs/run-5/messages?before_seq=10")
    assert response.status_code == 200
    event_store.list_messages_by_run.assert_awaited_once_with(
        "thread-5",
        "run-5",
        limit=51,
        before_seq=10,
        after_seq=None,
    )


@pytest.mark.parametrize("cursor", ["before_seq", "after_seq"])
@pytest.mark.parametrize("value", [0, -1])
def test_run_messages_rejects_non_positive_seq_cursors(cursor: str, value: int):
    run_record = {"run_id": "run-6", "thread_id": "thread-6"}
    app = _make_app(
        run_store=_make_run_store(run_record),
        event_store=_make_event_store([]),
    )
    with TestClient(app) as client:
        response = client.get("/api/runs/run-6/messages", params={cursor: value})

    assert response.status_code == 422


def test_run_messages_empty_data():
    """Returns empty data list when no messages exist."""
    run_record = {"run_id": "run-6", "thread_id": "thread-6"}
    app = _make_app(
        run_store=_make_run_store(run_record),
        event_store=_make_event_store([]),
    )
    with TestClient(app) as client:
        response = client.get("/api/runs/run-6/messages")
    assert response.status_code == 200
    body = response.json()
    assert body["data"] == []
    assert body["has_more"] is False


def _make_feedback_repo(rows: list[dict]):
    """Return an AsyncMock feedback repo whose list_by_run() returns rows."""
    repo = MagicMock()
    repo.list_by_run = AsyncMock(return_value=rows)
    return repo


def test_resolve_thread_id_handles_null_configurable():
    """A client may send ``config.configurable`` as JSON ``null``.

    The key is then present with value ``None``, so the old
    ``.get("configurable", {}).get("thread_id")`` raised ``AttributeError``
    (an unhandled HTTP 500). Per the docstring it should generate a new id.
    """
    import uuid

    from app.gateway.routers.thread_runs import RunCreateRequest

    tid = runs._resolve_thread_id(RunCreateRequest(config={"configurable": None}))
    uuid.UUID(tid)  # a freshly generated id, not a crash

    # working inputs are unaffected
    assert runs._resolve_thread_id(RunCreateRequest(config={"configurable": {"thread_id": "t1"}})) == "t1"


def test_build_run_config_handles_null_configurable():
    """A null ``configurable`` must also survive ``build_run_config``.

    ``_resolve_thread_id`` is not the only place that reads it: ``build_run_config``
    does ``configurable.update(request_config.get("configurable", {}))`` and, in the
    ``context`` branch, ``request_config.get("configurable", {}).keys()``. With the
    key present and ``None``, ``.get(..., {})`` returns ``None``, so both raised
    (``dict.update(None)`` / ``None.keys()``) -- an unhandled HTTP 500 that the
    isolated ``_resolve_thread_id`` test could not catch.
    """
    from app.gateway.services import build_run_config

    config = build_run_config("t1", {"configurable": None}, None)
    assert config["configurable"]["thread_id"] == "t1"

    # the context branch logs the caller's configurable keys; a null value must not crash
    config = build_run_config("t1", {"context": {}, "configurable": None}, None)
    assert config["configurable"]["thread_id"] == "t1"