import random
import time
import unittest
from PIL import Image

import numpy as np

import storage


class StorageTest(unittest.TestCase):
    def setUp(self):
        self.dir = "./tmp/storage_test"
        self.writer = storage.StorageWriter(
            self.dir, sync_cycle=1).as_mode("train")

    def test_scalar(self):
        print 'test write'
        scalar = self.writer.scalar("model/scalar/min")
        # scalar.set_caption("model/scalar/min")
        for i in range(10):
            scalar.add_record(i, float(i))

        print 'test read'
        self.reader = storage.StorageReader(self.dir).as_mode("train")
        scalar = self.reader.scalar("model/scalar/min")
        self.assertEqual(scalar.caption(), "train")
        records = scalar.records()
        ids = scalar.ids()
        self.assertTrue(np.equal(records, [float(i) for i in range(10)]).all())
        self.assertTrue(np.equal(ids, [float(i) for i in range(10)]).all())
        print 'records', records
        print 'ids', ids

    def test_image(self):
        tag = "layer1/layer2/image0"
        image_writer = self.writer.image(tag, 10, 1)
        num_passes = 10
        num_samples = 100
        shape = [10, 10, 3]

        for pass_ in xrange(num_passes):
            image_writer.start_sampling()
            for ins in xrange(num_samples):
                index =  image_writer.is_sample_taken()
                if index != -1:
                    data = np.random.random(shape) * 256
                    data = np.ndarray.flatten(data)
                    image_writer.set_sample(index, shape, list(data))
            image_writer.finish_sampling()

        self.reader = storage.StorageReader(self.dir).as_mode("train")
        image_reader = self.reader.image(tag)
        self.assertEqual(image_reader.caption(), tag)
        self.assertEqual(image_reader.num_records(), num_passes)

        image_record = image_reader.record(0, 1)
        self.assertTrue(np.equal(image_record.shape(), shape).all())
        data = image_record.data()
        self.assertEqual(len(data), np.prod(shape))

        image_tags = self.reader.tags("image")
        self.assertTrue(image_tags)
        self.assertEqual(len(image_tags), 1)

    def test_check_image(self):
        '''
        check whether the storage will keep image data consistent
        '''
        print 'check image'
        tag = "layer1/check/image1"
        image_writer = self.writer.image(tag, 10, 1)

        image = Image.open("./dog.jpg")
        shape = [image.size[1], image.size[0], 3]
        origin_data = np.array(image.getdata()).flatten()

        self.reader = storage.StorageReader(self.dir).as_mode("train")

        image_writer.start_sampling()
        index = image_writer.is_sample_taken()
        image_writer.set_sample(index, shape, list(origin_data))
        image_writer.finish_sampling()

        # read and check whether the original image will be displayed

        image_reader = self.reader.image(tag)
        image_record = image_reader.record(0, 0)
        data = image_record.data()
        shape = image_record.shape()

        PIL_image_shape = (shape[0]*shape[1], shape[2])
        data = np.array(data, dtype='uint8').reshape(PIL_image_shape)
        print 'origin', origin_data.flatten()
        print 'data', data.flatten()
        image = Image.fromarray(data.reshape(shape))

        self.assertTrue(np.equal(origin_data.reshape(PIL_image_shape), data).all())








if __name__ == '__main__':
    unittest.main()