import shutil
import sys
import time
import types
from os import path as osp
from pathlib import Path

import pytest

import constants as c_mod


def _stub_train_dependencies():
    if getattr(_stub_train_dependencies, "_done", False):
        return

    def add_mod(name):
        if name in sys.modules:
            return sys.modules[name]
        m = types.ModuleType(name)
        sys.modules[name] = m
        return m

    ultra = add_mod("ultralytics")

    class YOLO:
        pass

    ultra.YOLO = YOLO

    def fake_client(*_a, **_k):
        return types.SimpleNamespace(
            upload_fileobj=lambda *_a, **_k: None,
            download_file=lambda *_a, **_k: None,
        )

    boto = add_mod("boto3")
    boto.client = fake_client
    add_mod("netron")
    add_mod("requests")
    _stub_train_dependencies._done = True


_stub_train_dependencies()


def _prepare_form_dataset(
    monkeypatch,
    tmp_path,
    constants_patch,
    fixture_images_dir,
    fixture_labels_dir,
    count,
    corrupt_stems,
):
    constants_patch(tmp_path)
    import train

    proc_img = Path(c_mod.processed_images_dir)
    proc_lbl = Path(c_mod.processed_labels_dir)
    proc_img.mkdir(parents=True, exist_ok=True)
    proc_lbl.mkdir(parents=True, exist_ok=True)

    imgs = sorted(fixture_images_dir.glob("*.jpg"))[:count]
    for p in imgs:
        stem = p.stem
        shutil.copy2(fixture_images_dir / f"{stem}.jpg", proc_img / f"{stem}.jpg")
        dst = proc_lbl / f"{stem}.txt"
        shutil.copy2(fixture_labels_dir / f"{stem}.txt", dst)
        if stem in corrupt_stems:
            dst.write_text("0 1.5 0.5 0.1 0.1\n", encoding="utf-8")

    today_ds = osp.join(c_mod.datasets_dir, train.today_folder)
    monkeypatch.setattr(train, "today_dataset", today_ds)
    monkeypatch.setattr(train, "processed_images_dir", c_mod.processed_images_dir)
    monkeypatch.setattr(train, "processed_labels_dir", c_mod.processed_labels_dir)
    monkeypatch.setattr(train, "corrupted_images_dir", c_mod.corrupted_images_dir)
    monkeypatch.setattr(train, "corrupted_labels_dir", c_mod.corrupted_labels_dir)
    monkeypatch.setattr(train, "datasets_dir", c_mod.datasets_dir)
    return train


@pytest.mark.performance
def test_pt_dsf_01_dataset_formation_under_thirty_seconds(
    monkeypatch,
    tmp_path,
    constants_patch,
    fixture_images_dir,
    fixture_labels_dir,
):
    train = _prepare_form_dataset(
        monkeypatch,
        tmp_path,
        constants_patch,
        fixture_images_dir,
        fixture_labels_dir,
        100,
        set(),
    )
    t0 = time.perf_counter()
    train.form_dataset()
    elapsed = time.perf_counter() - t0
    assert elapsed <= 30.0