"""Unit tests for scripts/aat_runner.py.

These tests use stubbed RunResult objects and mocked Runner.run() so
they don't require network, MCP subprocesses, or WatsonX.
"""

from __future__ import annotations

import argparse
import asyncio
import json
import logging
import sys
from pathlib import Path
from types import SimpleNamespace
from unittest.mock import patch

import pytest


def _stub_args(**overrides):
    defaults = dict(
        prompt="test prompt",
        output="/tmp/out.json",
        model_id="watsonx/meta-llama/llama-3-3-70b-instruct",
        mcp_mode="direct",
        max_turns=30,
        parallel_tool_calls=False,
        verbose=False,
    )
    defaults.update(overrides)
    return argparse.Namespace(**defaults)


def _msg_item(text: str):
    """Build a stub message_output_item matching AOB's parser."""
    return SimpleNamespace(
        type="message_output_item",
        raw_item=SimpleNamespace(content=[SimpleNamespace(text=text)]),
    )


def _tool_call_item(name: str, args: dict, call_id: str = "c1"):
    """Build a stub tool_call_item."""
    import json as _json

    return SimpleNamespace(
        type="tool_call_item",
        raw_item=SimpleNamespace(
            name=name,
            arguments=_json.dumps(args),
            call_id=call_id,
            id=call_id,
        ),
    )


def _tool_output_item(output: str):
    return SimpleNamespace(type="tool_call_output_item", output=output)


def _stub_run_result(
    items=None, final_output="final answer text", max_turns_reached=False
):
    """Build a minimal RunResult-shaped object for serializer tests.

    Matches the shape AOB's _build_trajectory in
    ../AssetOpsBench/src/agent/openai_agent/runner.py:121 walks.
    """
    return SimpleNamespace(
        new_items=items or [],
        final_output=final_output,
        max_turns_reached=max_turns_reached,
        raw_responses=[],
    )


def test_expand_scenario_glob_accepts_shell_style_explicit_list(tmp_path: Path):
    from scripts.aat_runner import _expand_scenario_glob

    first = tmp_path / "multi_01_end_to_end_fault_response.json"
    second = tmp_path / "multi_02_dga_to_workorder_pipeline.json"
    first.write_text("{}", encoding="utf-8")
    second.write_text("{}", encoding="utf-8")

    scenario_files = _expand_scenario_glob(f"{first.name} {second.name}", tmp_path)

    assert [path.name for path in scenario_files] == [first.name, second.name]


def test_expand_scenario_glob_accepts_single_bracket_glob(tmp_path: Path):
    from scripts.aat_runner import _expand_scenario_glob

    first = tmp_path / "multi_01_end_to_end_fault_response.json"
    second = tmp_path / "multi_02_dga_to_workorder_pipeline.json"
    third = tmp_path / "multi_03_iot_tsfm_thermal_risk.json"
    for path in (first, second, third):
        path.write_text("{}", encoding="utf-8")

    scenario_files = _expand_scenario_glob("multi_0[12]_*.json", tmp_path)

    assert [path.name for path in scenario_files] == [first.name, second.name]


def test_expand_scenario_glob_empty_string_returns_no_paths(tmp_path: Path):
    from scripts.aat_runner import _expand_scenario_glob

    assert _expand_scenario_glob("", tmp_path) == []


def test_expand_scenario_glob_deduplicates_overlapping_patterns(tmp_path: Path):
    from scripts.aat_runner import _expand_scenario_glob

    first = tmp_path / "multi_01_end_to_end_fault_response.json"
    second = tmp_path / "multi_02_dga_to_workorder_pipeline.json"
    first.write_text("{}", encoding="utf-8")
    second.write_text("{}", encoding="utf-8")

    scenario_files = _expand_scenario_glob(f"{first.name} multi_0[12]_*.json", tmp_path)

    assert [path.name for path in scenario_files] == [first.name, second.name]


def test_serialize_run_result_happy_path():
    from scripts.aat_runner import _serialize_run_result

    args = _stub_args()
    result = _stub_run_result(
        items=[
            _tool_call_item("iot.list_sensors", {"asset_id": "T-1"}, "c1"),
            _tool_output_item("[]"),
            _msg_item("final answer text"),
        ]
    )

    out = _serialize_run_result(args, "test prompt", result, duration_seconds=12.5)

    assert out["question"] == "test prompt"
    assert out["answer"] == "final answer text"
    assert out["success"] is True
    assert out["max_turns_exhausted"] is False
    assert out["turn_count"] >= 1
    assert out["tool_call_count"] == 1
    assert out["runner_meta"]["model_id"] == args.model_id
    assert out["runner_meta"]["mcp_mode"] == "direct"
    assert out["runner_meta"]["max_turns"] == 30
    assert out["runner_meta"]["parallel_tool_calls"] is False
    assert out["runner_meta"]["duration_seconds"] == 12.5
    assert "aob_prompt_sha" in out["runner_meta"]

    # Regression guard: a tool call appearing before any message text must
    # still surface in history[0].tool_calls (not just tool_call_count).
    assert len(out["history"]) >= 1
    turn0 = out["history"][0]
    assert turn0["content"] == ""
    assert len(turn0["tool_calls"]) == 1
    assert turn0["tool_calls"][0]["name"] == "iot.list_sensors"
    assert turn0["tool_calls"][0]["output"] == "[]"
    # Sanity check: the final assistant content made it into the last turn.
    assert out["history"][-1]["content"] == "final answer text"


def test_serialize_run_result_warns_on_orphan_tool_output(caplog):
    from scripts.aat_runner import _serialize_run_result

    args = _stub_args()
    result = _stub_run_result(items=[_tool_output_item("late output")])

    with caplog.at_level(logging.WARNING, logger="aat_runner"):
        out = _serialize_run_result(args, "test prompt", result, duration_seconds=1.0)

    assert out["success"] is True
    assert "without a pending tool call" in caplog.text


def test_serialize_run_result_max_turns_exhausted():
    from scripts.aat_runner import _serialize_run_result

    args = _stub_args()
    result = _stub_run_result(
        items=[_msg_item("still thinking")],
        final_output=None,
        max_turns_reached=True,
    )

    out = _serialize_run_result(args, "test prompt", result, duration_seconds=99.0)

    assert out["success"] is False
    assert out["max_turns_exhausted"] is True


# ---------------------------------------------------------------------------
# #133 — token usage capture from the Agents SDK RunContextWrapper.usage
# ---------------------------------------------------------------------------


def _stub_run_result_with_usage(
    *,
    input_tokens: int | None = 1234,
    output_tokens: int | None = 567,
    total_tokens: int | None = 1801,
    requests: int | None = 5,
):
    """Stub RunResult with a context_wrapper.usage that mirrors the SDK shape."""
    return SimpleNamespace(
        new_items=[_msg_item("answer")],
        final_output="answer",
        max_turns_reached=False,
        raw_responses=[],
        context_wrapper=SimpleNamespace(
            usage=SimpleNamespace(
                input_tokens=input_tokens,
                output_tokens=output_tokens,
                total_tokens=total_tokens,
                requests=requests,
            )
        ),
    )


def test_serialize_usage_captured_when_present():
    """Trial JSON should carry the usage block from RunContextWrapper.usage."""
    from scripts.aat_runner import _serialize_run_result

    out = _serialize_run_result(
        _stub_args(), "p", _stub_run_result_with_usage(), duration_seconds=1.0
    )

    assert out["usage"] == {
        "input_tokens": 1234,
        "output_tokens": 567,
        "total_tokens": 1801,
        "requests": 5,
    }


def test_serialize_usage_missing_yields_null_block():
    """Older SDK / stubbed result without context_wrapper -> all-null usage block.

    summary.json's aggregator distinguishes None (no data) from 0 (zero
    tokens), so we deliberately don't fall back to zeros here.
    """
    from scripts.aat_runner import _serialize_run_result

    out = _serialize_run_result(
        _stub_args(), "p", _stub_run_result(), duration_seconds=1.0
    )

    assert out["usage"] == {
        "input_tokens": None,
        "output_tokens": None,
        "total_tokens": None,
        "requests": None,
    }


def test_serialize_usage_negative_or_non_int_treated_as_missing():
    """A malformed SDK Usage with strings / negatives shouldn't poison the block."""
    from scripts.aat_runner import _serialize_run_result

    out = _serialize_run_result(
        _stub_args(),
        "p",
        _stub_run_result_with_usage(
            input_tokens="not-an-int",
            output_tokens=-1,
            total_tokens=None,
            requests=True,  # bool is technically int subclass; explicitly excluded.
        ),
        duration_seconds=1.0,
    )

    assert out["usage"] == {
        "input_tokens": None,
        "output_tokens": None,
        "total_tokens": None,
        "requests": None,
    }


# ---------------------------------------------------------------------------
# #131 — type-specific JSON encoder (replaces default=str)
# ---------------------------------------------------------------------------


def test_json_default_serializes_datetime_and_date():
    """stdlib datetime + date land as ISO-8601 strings, matching the prior behavior."""
    import datetime as dt

    from scripts.aat_runner import _json_default

    assert _json_default(dt.datetime(2026, 4, 28, 17, 0, 0)) == "2026-04-28T17:00:00"
    assert _json_default(dt.date(2026, 4, 28)) == "2026-04-28"


def test_json_default_serializes_pandas_timestamp_when_available():
    """pandas.Timestamp -> isoformat. Skip cleanly if pandas isn't installed."""
    pd = pytest.importorskip("pandas")
    from scripts.aat_runner import _json_default

    ts = pd.Timestamp("2026-04-28T17:00:00")
    assert _json_default(ts) == ts.isoformat()


def test_json_default_serializes_numpy_datetime64_when_available():
    """numpy.datetime64 -> ISO string via pandas if both installed."""
    np = pytest.importorskip("numpy")
    from scripts.aat_runner import _json_default

    out = _json_default(np.datetime64("2026-04-28T17:00:00"))
    # Accept either pandas-routed isoformat or the raw datetime64 str()
    # (which is also roundtrippable for this type specifically).
    assert "2026-04-28" in out


def test_json_default_rejects_numpy_array():
    """numpy.ndarray must raise TypeError, not silently stringify (Anonymous reviewer's M5)."""
    np = pytest.importorskip("numpy")
    from scripts.aat_runner import _json_default

    with pytest.raises(TypeError, match="numpy"):
        _json_default(np.array([1, 2, 3]))


def test_json_default_rejects_pandas_dataframe():
    """pandas.DataFrame must raise TypeError, not write the human-readable table."""
    pd = pytest.importorskip("pandas")
    from scripts.aat_runner import _json_default

    with pytest.raises(TypeError, match="pandas"):
        _json_default(pd.DataFrame({"a": [1, 2, 3]}))


def test_json_default_rejects_arbitrary_object():
    """Anything outside the allow-list must raise TypeError, not stringify."""
    from scripts.aat_runner import _json_default

    class Unhandled:
        pass

    with pytest.raises(TypeError, match="unserializable"):
        _json_default(Unhandled())


def test_write_output_uses_type_specific_encoder(tmp_path):
    """End-to-end: _write_output rejects a payload containing a numpy array.

    The prior code would silently write '[1 2 3]'; the new code fails closed.
    """
    np = pytest.importorskip("numpy")
    from scripts.aat_runner import _write_output

    bad_payload = {"answer": "ok", "rogue": np.array([1, 2, 3])}
    with pytest.raises(TypeError, match="numpy"):
        _write_output(tmp_path / "out.json", bad_payload)


def test_write_output_serializes_timestamp_payload(tmp_path):
    """The Timestamp case PR #130 originally fixed must still work."""
    pd = pytest.importorskip("pandas")
    from scripts.aat_runner import _write_output

    payload = {"answer": "ok", "ts": pd.Timestamp("2026-04-28T17:00:00")}
    out = tmp_path / "trial.json"
    _write_output(out, payload)
    loaded = json.loads(out.read_text())
    assert loaded["ts"] == "2026-04-28T17:00:00"


def test_cli_parses_required_args():
    from scripts.aat_runner import build_parser

    parser = build_parser()
    args = parser.parse_args(
        [
            "--prompt",
            "p",
            "--output",
            "/tmp/o.json",
            "--model-id",
            "watsonx/x",
            "--mcp-mode",
            "direct",
        ]
    )
    assert args.prompt == "p"
    assert args.mcp_mode == "direct"
    assert args.max_turns == 30  # default
    assert args.parallel_tool_calls is False  # vLLM-compatible default


def test_cli_parses_parallel_tool_call_modes():
    from scripts.aat_runner import build_parser

    parser = build_parser()
    common = [
        "--prompt",
        "p",
        "--output",
        "/tmp/o.json",
        "--model-id",
        "watsonx/x",
        "--mcp-mode",
        "direct",
        "--parallel-tool-calls",
    ]

    assert parser.parse_args(common + ["false"]).parallel_tool_calls is False
    assert parser.parse_args(common + ["true"]).parallel_tool_calls is True
    assert parser.parse_args(common + ["auto"]).parallel_tool_calls is None


def test_cli_missing_args_errors():
    from scripts.aat_runner import build_parser

    parser = build_parser()
    with pytest.raises(SystemExit):
        parser.parse_args(["--prompt", "p"])  # missing everything else


def test_cli_invalid_mcp_mode_errors():
    from scripts.aat_runner import build_parser

    parser = build_parser()
    with pytest.raises(SystemExit):
        parser.parse_args(
            [
                "--prompt",
                "p",
                "--output",
                "/tmp/o.json",
                "--model-id",
                "x",
                "--mcp-mode",
                "nonsense",
            ]
        )


def test_runner_threads_litellm_env(monkeypatch):
    from scripts.aat_runner import AaTRunner

    captured: dict[str, object] = {}

    class FakeLitellmModel:
        def __init__(self, model, base_url=None, api_key=None):
            captured["model"] = model
            captured["base_url"] = base_url
            captured["api_key"] = api_key

    class FakeModelSettings:
        def __init__(self, **kwargs):
            self.kwargs = kwargs

    class FakeAgent:
        def __init__(self, **kwargs):
            captured["agent_kwargs"] = kwargs

    class FakeRunner:
        @staticmethod
        async def run(agent, prompt, max_turns):
            captured["prompt"] = prompt
            captured["max_turns"] = max_turns
            return _stub_run_result()

    monkeypatch.setenv("LITELLM_BASE_URL", "http://127.0.0.1:8000/v1")
    monkeypatch.setenv("LITELLM_API_KEY", "dummy-vllm-not-checked")
    monkeypatch.setitem(
        sys.modules,
        "agents",
        SimpleNamespace(
            Agent=FakeAgent,
            ModelSettings=FakeModelSettings,
            Runner=FakeRunner,
            __version__="test",
        ),
    )
    monkeypatch.setitem(sys.modules, "agents.extensions", SimpleNamespace())
    monkeypatch.setitem(sys.modules, "agents.extensions.models", SimpleNamespace())
    monkeypatch.setitem(
        sys.modules,
        "agents.extensions.models.litellm_model",
        SimpleNamespace(LitellmModel=FakeLitellmModel),
    )

    runner = AaTRunner(model_id="openai/Llama-3.1-8B-Instruct", mcp_mode="direct")
    asyncio.run(runner.run("hello"))

    assert captured["model"] == "openai/Llama-3.1-8B-Instruct"
    assert captured["base_url"] == "http://127.0.0.1:8000/v1"
    assert captured["api_key"] == "dummy-vllm-not-checked"
    assert captured["prompt"] == "hello"
    assert captured["max_turns"] == 30
    settings = captured["agent_kwargs"]["model_settings"]
    assert settings.kwargs["parallel_tool_calls"] is False


def test_watsonx_runner_omits_openai_only_model_settings(monkeypatch):
    from scripts.aat_runner import AaTRunner

    captured: dict[str, object] = {}

    class FakeLitellmModel:
        def __init__(self, model, base_url=None, api_key=None):
            captured["model"] = model

    class FakeModelSettings:
        def __init__(self, **kwargs):
            self.kwargs = kwargs

    class FakeAgent:
        def __init__(self, **kwargs):
            captured["agent_kwargs"] = kwargs

    class FakeRunner:
        @staticmethod
        async def run(agent, prompt, max_turns):
            return _stub_run_result()

    fake_litellm = SimpleNamespace(drop_params=False)
    monkeypatch.setitem(sys.modules, "litellm", fake_litellm)
    monkeypatch.setitem(
        sys.modules,
        "agents",
        SimpleNamespace(
            Agent=FakeAgent,
            ModelSettings=FakeModelSettings,
            Runner=FakeRunner,
            __version__="test",
        ),
    )
    monkeypatch.setitem(sys.modules, "agents.extensions", SimpleNamespace())
    monkeypatch.setitem(sys.modules, "agents.extensions.models", SimpleNamespace())
    monkeypatch.setitem(
        sys.modules,
        "agents.extensions.models.litellm_model",
        SimpleNamespace(LitellmModel=FakeLitellmModel),
    )

    runner = AaTRunner(
        model_id="watsonx/meta-llama/llama-3-3-70b-instruct",
        mcp_mode="direct",
        parallel_tool_calls=False,
    )
    asyncio.run(runner.run("hello"))

    assert captured["model"] == "watsonx/meta-llama/llama-3-3-70b-instruct"
    assert "model_settings" not in captured["agent_kwargs"]
    assert fake_litellm.drop_params is True


def test_watsonx_runner_rejects_parallel_tool_calls_true(monkeypatch):
    from scripts.aat_runner import AaTRunner

    monkeypatch.setitem(
        sys.modules,
        "agents",
        SimpleNamespace(
            Agent=lambda **_kwargs: None,
            ModelSettings=lambda **_kwargs: None,
            Runner=SimpleNamespace(run=lambda *_args, **_kwargs: None),
            __version__="test",
        ),
    )
    monkeypatch.setitem(sys.modules, "agents.extensions", SimpleNamespace())
    monkeypatch.setitem(sys.modules, "agents.extensions.models", SimpleNamespace())
    monkeypatch.setitem(
        sys.modules,
        "agents.extensions.models.litellm_model",
        SimpleNamespace(LitellmModel=lambda **_kwargs: None),
    )

    runner = AaTRunner(
        model_id="watsonx/meta-llama/llama-3-3-70b-instruct",
        mcp_mode="direct",
        parallel_tool_calls=True,
    )

    with pytest.raises(ValueError, match="WatsonX does not support"):
        asyncio.run(runner.run("hello"))


def test_batch_mode_requires_output_dir():
    from scripts.aat_runner import _main

    args = argparse.Namespace(
        scenarios_glob="data/scenarios/*.json",
        output_dir=None,
        prompt=None,
        output=None,
        model_id="x",
        mcp_mode="optimized",
        max_turns=30,
        parallel_tool_calls=False,
        verbose=False,
        trials=1,
        run_basename="batch",
    )
    assert asyncio.run(_main(args)) == 2


def test_batch_mode_rejects_non_optimized_mcp_mode(tmp_path):
    from scripts.aat_runner import _main

    args = argparse.Namespace(
        scenarios_glob="nonexistent_xyzzy_*.json",
        output_dir=str(tmp_path),
        prompt=None,
        output=None,
        model_id="x",
        mcp_mode="direct",
        max_turns=30,
        parallel_tool_calls=False,
        verbose=False,
        trials=1,
        run_basename="batch",
    )
    assert asyncio.run(_main(args)) == 2


def test_batch_mode_rejects_zero_trials(tmp_path):
    """--trials must be >= 1; zero/negative must return rc=2 without creating output dir."""
    from scripts.aat_runner import _main_multi
    from pathlib import Path

    repo_root = Path(__file__).resolve().parent.parent
    new_subdir = tmp_path / "should_not_be_created"
    for bad_trials in (0, -1):
        args = argparse.Namespace(
            scenarios_glob="nonexistent_xyzzy_*.json",
            output_dir=str(new_subdir),
            model_id="x",
            mcp_mode="optimized",
            max_turns=30,
            parallel_tool_calls=False,
            trials=bad_trials,
            run_basename="batch",
        )
        rc = asyncio.run(_main_multi(args, repo_root))
        assert rc == 2, f"expected rc=2 for trials={bad_trials}, got {rc}"
        assert (
            not new_subdir.exists()
        ), f"output dir must not be created for trials={bad_trials}"


def test_batch_output_dir_normalization():
    """Regression: relative --output-dir must not raise ValueError in relative_to().

    Directly exercises the path arithmetic that crashed before the fix, without
    calling _main_multi (which would mkdir under the repo and never reach
    relative_to due to the empty-glob early-return).
    """
    from pathlib import Path

    repo_root = Path(__file__).resolve().parent.parent
    # Simulate what _main_multi does: resolve relative arg under repo_root.
    raw = Path("benchmarks/cell_C_mcp_optimized/raw/test-run")
    output_dir = repo_root / raw  # normalization step added by the fix
    out_path = output_dir / "batch_scenario_run01.json"
    # This is the exact call that raised ValueError before the fix.
    rel = out_path.relative_to(repo_root)
    assert rel == Path(
        "benchmarks/cell_C_mcp_optimized/raw/test-run/batch_scenario_run01.json"
    )


def test_batch_mode_rejects_non_optimized_before_mkdir(tmp_path):
    """M1 regression: mcp_mode guard must fire before output_dir is created."""
    from scripts.aat_runner import _main_multi
    from pathlib import Path

    repo_root = Path(__file__).resolve().parent.parent
    new_subdir = tmp_path / "should_not_be_created"
    args = argparse.Namespace(
        scenarios_glob="nonexistent_xyzzy_*.json",
        output_dir=str(new_subdir),
        model_id="x",
        mcp_mode="direct",
        max_turns=30,
        parallel_tool_calls=False,
        trials=1,
        run_basename="batch",
    )
    rc = asyncio.run(_main_multi(args, repo_root))
    assert rc == 2
    assert not new_subdir.exists()


def test_batch_latency_path_outside_repo_root(tmp_path):
    """M3 regression: relative_to() fallback must not raise for absolute out-of-repo path."""
    from pathlib import Path

    repo_root = Path(__file__).resolve().parent.parent
    out_path = tmp_path / "trial_01.json"  # tmp_path is outside repo_root
    # Reproduce the exact try/except logic from _main_multi latency record construction.
    try:
        result = out_path.relative_to(repo_root).as_posix()
    except ValueError:
        result = out_path.as_posix()
    # tmp_path is outside repo_root, so the fallback must kick in.
    assert result == out_path.as_posix()