"""Tests for harness/A/run.py -- question loading, scoring, and result-file writing."""

import json

import pytest

from harness import A
from harness.A import run as harness_run

_FAKE_ANSWER = {
    "prompt_text": "<rendered chat template>",
    "answer_text": "4",
    "answer_raw": "<|im_start|>assistant\n4<|im_end|>",
    "input_token_count": 123,
    "vision_input_shapes": {"pixel_values": [512, 1536]},
    "output_token_ids": [19, 151645],
    "output_token_count": 2,
    "hit_token_limit": False,
    "eos_token_ids": [151645],
    "generation_seconds": 1.234,
    "device": "cuda",
    "dtype": "bfloat16",
    "library_versions": {"transformers": "5.14.1", "torch": "2.13.0+cu130"},
    "generation_config": {
        "max_new_tokens": 16,
        "do_sample": False,
        "temperature": 0.0,
        "top_p": None,
        "top_k": None,
    },
}

_FAKE_ROW = {
    "id": 7,
    "scene_name": "scene0001_00",
    "dataset": "scannet",
    "question_type": "object_counting",
    "question": "How many chairs?",
    "options": None,
    "ground_truth": "4",
}

_FAKE_FRAME_INFO = {
    "protocol": "base",
    "video_path": "/root/data/VSI-Bench/scannet/scene0001_00.mp4",
    "frame_timestamps": [0.0, 1.0, 2.0],
    "frame_indices": [0, 30, 60],
    "frame_selection": "uniform",
    "frame_count": 16,
}


def test_load_questions_reads_every_row(tmp_path):
    jsonl = tmp_path / "test.jsonl"
    jsonl.write_text(
        "\n".join(
            json.dumps({"id": i, "scene_name": f"scene{i}", "question": "q"})
            for i in range(3)
        )
    )
    rows = harness_run.load_questions(jsonl)
    assert [r["id"] for r in rows] == [0, 1, 2]


def test_load_questions_filters_by_scene(tmp_path):
    jsonl = tmp_path / "test.jsonl"
    jsonl.write_text(
        "\n".join(
            json.dumps({"id": i, "scene_name": "a" if i < 2 else "b", "question": "q"})
            for i in range(4)
        )
    )
    rows = harness_run.load_questions(jsonl, scene="b")
    assert [r["id"] for r in rows] == [2, 3]


def test_load_questions_respects_limit(tmp_path):
    jsonl = tmp_path / "test.jsonl"
    jsonl.write_text(
        "\n".join(
            json.dumps({"id": i, "scene_name": "a", "question": "q"}) for i in range(5)
        )
    )
    rows = harness_run.load_questions(jsonl, limit=2)
    assert [r["id"] for r in rows] == [0, 1]


def test_scalar_score_returns_metric_name_and_value():
    doc = {"question_type": "object_counting", "ground_truth": "4"}
    score_doc = harness_run.vsi_official_eval.vsibench_process_results(doc, ["4"])[
        "vsibench_score"
    ]
    metric_name, value = harness_run._scalar_score("object_counting", score_doc)
    assert metric_name == "MRA:.5:.95:.05"
    assert value == 1.0


def test_scalar_score_rejects_unknown_question_type():
    with pytest.raises(ValueError):
        harness_run._scalar_score("not_a_real_type", {})


def test_results_dir_for_matches_established_dimension_nesting():
    root = harness_run.results_dir_for("qwen3.5-4b", "base", "selective", 32)
    assert root == A.RESULTS_DIR / "qwen3.5-4b" / "selective" / "32"


def test_results_dir_for_keeps_protocols_together():
    base = harness_run.results_dir_for("qwen3.5-4b", "base", "selective", 32)
    extended = harness_run.results_dir_for("qwen3.5-4b", "thinking", "selective", 32)
    assert base == extended


def test_results_dir_for_honors_explicit_override(tmp_path):
    assert (
        harness_run.results_dir_for("qwen3.5-4b", "base", "uniform", 16, tmp_path)
        == tmp_path
    )


def test_build_record_preserves_every_field_untruncated():
    record = harness_run._build_record(
        _FAKE_ROW,
        "full prompt text",
        _FAKE_ANSWER,
        "MRA:.5:.95:.05",
        1.0,
        "qwen3.5-4b",
        "/root/models/qwen3.5-4b",
        _FAKE_FRAME_INFO,
    )
    assert record["question"] == "How many chairs?"
    assert record["full_prompt"] == "full prompt text"
    assert record["rendered_prompt"] == _FAKE_ANSWER["prompt_text"]
    assert record["answer_given"] == "4"
    assert record["answer_raw"] == _FAKE_ANSWER["answer_raw"]
    assert record["output_token_ids"] == [19, 151645]
    assert record["output_token_count"] == 2
    assert record["hit_token_limit"] is False
    assert record["generation_config"] == _FAKE_ANSWER["generation_config"]
    assert record["frame_timestamps_seconds"] == [0.0, 1.0, 2.0]
    assert record["frame_indices"] == [0, 30, 60]
    assert record["video_path"] == _FAKE_FRAME_INFO["video_path"]
    assert record["device"] == "cuda"
    assert record["dtype"] == "bfloat16"
    assert record["library_versions"] == _FAKE_ANSWER["library_versions"]
    assert record["vision_input_shapes"] == {"pixel_values": [512, 1536]}
    assert record["generation_seconds"] == 1.234
    assert record["metric"] == "MRA:.5:.95:.05"
    assert record["score"] == 1.0
    assert record["scene"] == "scene0001_00"
    assert record["question_id"] == 7


def test_write_question_result_writes_one_json_file_per_question(tmp_path):
    path, record = harness_run.write_question_result(
        _FAKE_ROW,
        "full prompt text",
        _FAKE_ANSWER,
        "MRA:.5:.95:.05",
        1.0,
        "qwen3.5-4b",
        "/root/models/qwen3.5-4b",
        _FAKE_FRAME_INFO,
        results_dir=tmp_path,
    )
    assert path == tmp_path / "scene0001_00" / "7.json"
    on_disk = json.loads(path.read_text())
    assert on_disk == record


def test_build_record_defaults_reasoning_fields_when_not_extended():
    record = harness_run._build_record(
        _FAKE_ROW,
        "full prompt text",
        _FAKE_ANSWER,
        "MRA:.5:.95:.05",
        1.0,
        "qwen3.5-4b",
        "/root/models/qwen3.5-4b",
        _FAKE_FRAME_INFO,
    )
    assert record["reasoning_text"] is None
    assert record["forced"] is False
    assert record["forced_input_token_count"] is None


def test_build_record_carries_reasoning_fields_when_extended():
    extended_answer = {
        **_FAKE_ANSWER,
        "reasoning_text": "long reasoning about the scene",
        "reasoning_raw": "long reasoning about the scene<|im_end|>",
        "reasoning_token_ids": list(range(50)),
        "reasoning_token_count": 50,
        "reasoning_hit_limit": True,
        "forced": True,
        "forced_input_token_count": 2510,
    }
    record = harness_run._build_record(
        _FAKE_ROW,
        "full prompt text",
        extended_answer,
        "MRA:.5:.95:.05",
        1.0,
        "qwen3.5-4b",
        "/root/models/qwen3.5-4b",
        _FAKE_FRAME_INFO,
    )
    assert record["reasoning_text"] == "long reasoning about the scene"
    assert record["reasoning_raw"] == "long reasoning about the scene<|im_end|>"
    assert record["reasoning_token_ids"] == list(range(50))
    assert record["reasoning_token_count"] == 50
    assert record["reasoning_hit_limit"] is True
    assert record["forced"] is True
    assert record["forced_input_token_count"] == 2510


def test_video_results_use_video_branch():
    assert (
        harness_run.results_dir_for("qwen3.5-4b", "thinking", "video", None)
        == A.RESULTS_DIR / "qwen3.5-4b" / "video"
    )


def test_video_record_has_no_frame_count_in_condition():
    info = dict(_FAKE_FRAME_INFO, frame_selection="video", frame_count=None)
    record = harness_run._build_record(
        _FAKE_ROW, "prompt", _FAKE_ANSWER, "metric", 1.0, "qwen3.5-4b", "/model", info
    )
    assert record["condition"] == "base:video"
    assert record["frame_count"] is None