from pathlib import Path
from typing import cast

import numpy as np
import pytest

from batdetect2.api_v2 import BatDetect2API
from batdetect2.config import BatDetect2Config
from batdetect2.outputs import build_output_formatter
from batdetect2.outputs.formats import (
    BatDetect2OutputConfig,
    SoundEventOutputConfig,
)
from batdetect2.postprocess.types import ClipDetections


@pytest.fixture
def api_v2() -> BatDetect2API:
    """User story: API object manages prediction IO formats."""

    return BatDetect2API.from_config(BatDetect2Config())


@pytest.fixture
def file_prediction(api_v2: BatDetect2API, example_audio_files: list[Path]):
    """User story: users save/load predictions produced by API inference."""

    return api_v2.process_file(example_audio_files[0])


def test_save_and_load_predictions_roundtrip_default_raw(
    api_v2: BatDetect2API,
    file_prediction,
    tmp_path: Path,
) -> None:
    output_dir = tmp_path / "raw_preds"
    api_v2.save_predictions([file_prediction], path=output_dir)
    loaded = cast(list[ClipDetections], api_v2.load_predictions(output_dir))

    assert len(loaded) == 1
    loaded_prediction = loaded[0]
    assert loaded_prediction.clip == file_prediction.clip
    assert len(loaded_prediction.detections) == len(file_prediction.detections)

    for loaded_det, det in zip(
        loaded_prediction.detections,
        file_prediction.detections,
        strict=True,
    ):
        assert loaded_det.geometry == det.geometry
        assert np.isclose(loaded_det.detection_score, det.detection_score)
        np.testing.assert_allclose(
            loaded_det.class_scores,
            det.class_scores,
            atol=1e-6,
        )


def test_save_predictions_with_batdetect2_override(
    api_v2: BatDetect2API,
    file_prediction,
    tmp_path: Path,
) -> None:
    output_dir = tmp_path / "batdetect2_preds"
    api_v2.save_predictions(
        [file_prediction],
        path=output_dir,
        format="batdetect2",
    )

    formatter = build_output_formatter(
        targets=api_v2.targets,
        config=BatDetect2OutputConfig(),
    )
    loaded = formatter.load(output_dir)

    assert len(loaded) == 1
    assert "annotation" in loaded[0]
    assert len(loaded[0]["annotation"]) == len(file_prediction.detections)


def test_load_predictions_with_format_override(
    api_v2: BatDetect2API,
    file_prediction,
    tmp_path: Path,
) -> None:
    output_dir = tmp_path / "batdetect2_preds_load"
    api_v2.save_predictions(
        [file_prediction],
        path=output_dir,
        format="batdetect2",
    )

    loaded = api_v2.load_predictions(output_dir, format="batdetect2")

    assert len(loaded) == 1
    loaded_item = loaded[0]
    assert isinstance(loaded_item, dict)
    assert "annotation" in loaded_item


def test_save_predictions_with_soundevent_override(
    api_v2: BatDetect2API,
    file_prediction,
    tmp_path: Path,
) -> None:
    output_path = tmp_path / "soundevent_preds"
    api_v2.save_predictions(
        [file_prediction],
        path=output_path,
        format="soundevent",
    )

    formatter = build_output_formatter(
        targets=api_v2.targets,
        config=SoundEventOutputConfig(),
    )
    load_path = output_path.with_suffix(".json")
    loaded = formatter.load(load_path)

    assert load_path.exists()
    assert len(loaded) == 1
    assert len(loaded[0].sound_events) == len(file_prediction.detections)