#!/usr/bin/env python
# coding: utf-8
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"""
Simple example for using the ImageStack.

In this example we want to display images from different source: .h5, .edf
and .npy files.

To do so we simple reimplement the thread managing the loading of data.
"""

import numpy
import h5py
import tempfile
import logging
import shutil
import os
import time
from silx.io.url import DataUrl
from silx.io.utils import get_data
from silx.gui import qt
from silx.gui.plot.ImageStack import ImageStack, UrlLoader
import fabio


logging.basicConfig()
_logger = logging.getLogger("hdf5widget")
"""Module logger"""


def create_random_image():
    """Create a simple image with random values"""
    width = numpy.random.randint(100, 400)
    height = numpy.random.randint(100, 400)
    return numpy.random.random((width, height))


def create_h5py_urls(n_url, file_name):
    """ creates n urls based on h5py"""
    res = []
    with h5py.File(file_name, 'w') as h5f:
        for i in range(n_url):
            h5f[str(i)] = create_random_image()
            res.append(DataUrl(file_path=file_name,
                               data_path=str(i),
                               scheme='silx'))
    return res


def create_numpy_url(file_name):
    """ create a simple DataUrl with a .npy file """
    numpy.save(file=file_name, arr=create_random_image())
    return [DataUrl(file_path=file_name,
                    scheme='numpy'), ]


def create_edf_url(file_name):
    """ create a simple DataUrl with a .edf file"""
    dsc = fabio.edfimage.EdfImage(data=create_random_image(), header={})
    dsc.write(file_name)
    return [DataUrl(file_path=file_name,
                    data_slice=(0,),
                    scheme='fabio'), ]


def create_datasets(folder):
    """create a set of DataUrl containing each one image"""
    urls = []
    file_ = os.path.join(folder, 'myh5file.h5')
    urls.extend(create_h5py_urls(n_url=5, file_name=file_))
    file_ = os.path.join(folder, 'secondH5file.h5')
    urls.extend(create_h5py_urls(n_url=2, file_name=file_))
    file_ = os.path.join(folder, 'firstnumpy_file.npy')
    urls.extend(create_numpy_url(file_name=file_))
    file_ = os.path.join(folder, 'secondnumpy_file.npy')
    urls.extend(create_numpy_url(file_name=file_))
    file_ = os.path.join(folder, 'single_edf_file.edf')
    urls.extend(create_edf_url(file_name=file_))
    file_ = os.path.join(folder, 'single_edf_file_2.edf')
    urls.extend(create_edf_url(file_name=file_))
    return urls


class MyOwnUrlLoader(UrlLoader):
    """
    Thread use to load DataUrl
    """
    def __init__(self, parent, url):
        super(MyOwnUrlLoader, self).__init__(parent=parent, url=url)
        self.url = url
        self.data = None

    def run(self):
        # just to see the waiting interface...
        time.sleep(1.0)
        if self.url.scheme() == 'numpy':
            self.data = numpy.load(self.url.file_path())
        else:
            self.data = get_data(self.url)


def main():
    dataset_folder = tempfile.mkdtemp()

    qapp = qt.QApplication([])
    widget = ImageStack()
    widget.setUrlLoaderClass(MyOwnUrlLoader)
    widget.setNPrefetch(1)
    urls = create_datasets(folder=dataset_folder)
    widget.setUrls(urls=urls)
    widget.show()
    qapp.exec()
    widget.close()

    shutil.rmtree(dataset_folder)


if __name__ == '__main__':
    main()
    exit(0)
