# Ultralytics YOLO 🚀, GPL-3.0 license
import re

import matplotlib.image as mpimg
import matplotlib.pyplot as plt

from ultralytics.yolo.utils import LOGGER, TESTS_RUNNING
from ultralytics.yolo.utils.torch_utils import get_flops, get_num_params

try:
    import clearml
    from clearml import Task
    from clearml.binding.frameworks.pytorch_bind import PatchPyTorchModelIO
    from clearml.binding.matplotlib_bind import PatchedMatplotlib

    assert hasattr(clearml, '__version__')  # verify package is not directory
    assert not TESTS_RUNNING  # do not log pytest
except (ImportError, AssertionError):
    clearml = None


def _log_debug_samples(files, title='Debug Samples'):
    """
        Log files (images) as debug samples in the ClearML task.

        arguments:
        files (List(PosixPath)) a list of file paths in PosixPath format
        title (str) A title that groups together images with the same values
        """
    for f in files:
        if f.exists():
            it = re.search(r'_batch(\d+)', f.name)
            iteration = int(it.groups()[0]) if it else 0
            Task.current_task().get_logger().report_image(title=title,
                                                          series=f.name.replace(it.group(), ''),
                                                          local_path=str(f),
                                                          iteration=iteration)


def _log_plot(title, plot_path):
    """
        Log image as plot in the plot section of ClearML

        arguments:
        title (str) Title of the plot
        plot_path (PosixPath or str) Path to the saved image file
        """
    img = mpimg.imread(plot_path)
    fig = plt.figure()
    ax = fig.add_axes([0, 0, 1, 1], frameon=False, aspect='auto', xticks=[], yticks=[])  # no ticks
    ax.imshow(img)

    Task.current_task().get_logger().report_matplotlib_figure(title, '', figure=fig, report_interactive=False)


def on_pretrain_routine_start(trainer):
    # TODO: reuse existing task
    try:
        if Task.current_task():
            task = Task.current_task()

            # Make sure the automatic pytorch and matplotlib bindings are disabled!
            # We are logging these plots and model files manually in the integration
            PatchPyTorchModelIO.update_current_task(None)
            PatchedMatplotlib.update_current_task(None)
        else:
            task = Task.init(project_name=trainer.args.project or 'YOLOv8',
                             task_name=trainer.args.name,
                             tags=['YOLOv8'],
                             output_uri=True,
                             reuse_last_task_id=False,
                             auto_connect_frameworks={
                                 'pytorch': False,
                                 'matplotlib': False})
            LOGGER.warning('ClearML Initialized a new task. If you want to run remotely, '
                           'please add clearml-init and connect your arguments before initializing YOLO.')
        task.connect(vars(trainer.args), name='General')
    except Exception as e:
        LOGGER.warning(f'WARNING ⚠️ ClearML installed but not initialized correctly, not logging this run. {e}')


def on_train_epoch_end(trainer):
    if trainer.epoch == 1:
        _log_debug_samples(sorted(trainer.save_dir.glob('train_batch*.jpg')), 'Mosaic')


def on_fit_epoch_end(trainer):
    # You should have access to the validation bboxes under jdict
    Task.current_task().get_logger().report_scalar(title='Epoch Time',
                                                   series='Epoch Time',
                                                   value=trainer.epoch_time,
                                                   iteration=trainer.epoch)
    if trainer.epoch == 0:
        model_info = {
            'model/parameters': get_num_params(trainer.model),
            'model/GFLOPs': round(get_flops(trainer.model), 3),
            'model/speed(ms)': round(trainer.validator.speed['inference'], 3)}
        for k, v in model_info.items():
            Task.current_task().get_logger().report_single_value(k, v)


def on_val_end(validator):
    # Log val_labels and val_pred
    _log_debug_samples(sorted(validator.save_dir.glob('val*.jpg')), 'Validation')


def on_train_end(trainer):
    # Log final results, CM matrix + PR plots
    files = ['results.png', 'confusion_matrix.png', *(f'{x}_curve.png' for x in ('F1', 'PR', 'P', 'R'))]
    files = [(trainer.save_dir / f) for f in files if (trainer.save_dir / f).exists()]  # filter
    for f in files:
        _log_plot(title=f.stem, plot_path=f)
    # Report final metrics
    for k, v in trainer.validator.metrics.results_dict.items():
        Task.current_task().get_logger().report_single_value(k, v)
    # Log the final model
    Task.current_task().update_output_model(model_path=str(trainer.best),
                                            model_name=trainer.args.name,
                                            auto_delete_file=False)


callbacks = {
    'on_pretrain_routine_start': on_pretrain_routine_start,
    'on_train_epoch_end': on_train_epoch_end,
    'on_fit_epoch_end': on_fit_epoch_end,
    'on_val_end': on_val_end,
    'on_train_end': on_train_end} if clearml else {}