import unittest
import moto
import boto
import os

from storage import S3Storage
from storage.cloud import _CHUNKS_KEY
from StringIO import StringIO

_TEST_CONTENT = os.urandom(1024)
_TEST_BUCKET = 'some_bucket'
_TEST_USER = 'someuser'
_TEST_PASSWORD = 'somepassword'
_TEST_PATH = 'some/cool/path'

class TestCloudStorage(unittest.TestCase):
  def setUp(self):
    self.mock = moto.mock_s3()
    self.mock.start()

    # Create a test bucket and put some test content.
    boto.connect_s3().create_bucket(_TEST_BUCKET)
    self.engine = S3Storage(None, 'some/path', _TEST_BUCKET, _TEST_USER, _TEST_PASSWORD)
    self.engine.put_content(_TEST_PATH, _TEST_CONTENT)

  def tearDown(self):
    self.mock.stop()

  def test_basicop(self):
    # Ensure the content exists.
    self.assertTrue(self.engine.exists(_TEST_PATH))

    # Verify it can be retrieved.
    self.assertEquals(_TEST_CONTENT, self.engine.get_content(_TEST_PATH))

    # Retrieve a checksum for the content.
    self.engine.get_checksum(_TEST_PATH)

    # Remove the file.
    self.engine.remove(_TEST_PATH)

    # Ensure it no longer exists.
    with self.assertRaises(IOError):
      self.engine.get_content(_TEST_PATH)

    with self.assertRaises(IOError):
      self.engine.get_checksum(_TEST_PATH)

    self.assertFalse(self.engine.exists(_TEST_PATH))

  def test_copy_samecreds(self):
    # Copy the content to another engine.
    another_engine = S3Storage(None, 'another/path', _TEST_BUCKET, _TEST_USER, _TEST_PASSWORD)
    self.engine.copy_to(another_engine, _TEST_PATH)

    # Verify it can be retrieved.
    self.assertEquals(_TEST_CONTENT, another_engine.get_content(_TEST_PATH))

  def test_copy_differentcreds(self):
    # Copy the content to another engine.
    another_engine = S3Storage(None, 'another/path', 'another_bucket', 'blech', 'password')
    boto.connect_s3().create_bucket('another_bucket')

    self.engine.copy_to(another_engine, _TEST_PATH)

    # Verify it can be retrieved.
    self.assertEquals(_TEST_CONTENT, another_engine.get_content(_TEST_PATH))

  def test_stream_read(self):
    # Read the streaming content.
    data = ''.join(self.engine.stream_read(_TEST_PATH))
    self.assertEquals(_TEST_CONTENT, data)

  def test_stream_read_file(self):
    with self.engine.stream_read_file(_TEST_PATH) as f:
      self.assertEquals(_TEST_CONTENT, f.read())

  def test_stream_write(self):
    new_data = os.urandom(4096)
    self.engine.stream_write(_TEST_PATH, StringIO(new_data), content_type='Cool/Type')
    self.assertEquals(new_data, self.engine.get_content(_TEST_PATH))

  def test_chunked_upload_single_chunk(self):
    self._chunk_upload_test(1)

  def test_chunked_upload_multiple_chunks(self):
    self._chunk_upload_test(50)

  def test_chunked_upload_single_chunk_client_side(self):
    self._chunk_upload_test(1, force_client_side=True)

  def test_chunked_upload_multiple_chunks_client_side(self):
    self._chunk_upload_test(50, force_client_side=True)

  def _chunk_upload_test(self, chunk_count, force_client_side=False):
    upload_id, metadata = self.engine.initiate_chunked_upload()
    final_data = ''

    for index in range(0, chunk_count):
      chunk_data = os.urandom(1024)
      final_data = final_data + chunk_data
      bytes_written, new_metadata, error = self.engine.stream_upload_chunk(upload_id, 0,
                                                                           len(chunk_data),
                                                                           StringIO(chunk_data),
                                                                           metadata)
      metadata = new_metadata

      self.assertEquals(len(chunk_data), bytes_written)
      self.assertIsNone(error)
      self.assertEquals(index + 1, len(metadata[_CHUNKS_KEY]))

    # Complete the chunked upload.
    self.engine.complete_chunked_upload(upload_id, 'some/chunked/path', new_metadata,
                                        force_client_side=force_client_side)

    # Ensure the file contents are valid.
    self.assertEquals(final_data, self.engine.get_content('some/chunked/path'))

  def test_cancel_chunked_upload_single_chunk(self):
    self._cancel_chunked_upload_test(1)

  def test_cancel_chunked_upload_multiple_chunks(self):
    self._cancel_chunked_upload_test(50)

  def _cancel_chunked_upload_test(self, chunk_count):
    upload_id, metadata = self.engine.initiate_chunked_upload()

    for _ in range(0, chunk_count):
      chunk_data = os.urandom(1024)
      _, new_metadata, _ = self.engine.stream_upload_chunk(upload_id, 0,
                                                           len(chunk_data),
                                                           StringIO(chunk_data),
                                                           metadata)
      metadata = new_metadata

    # Cancel the upload.
    self.engine.cancel_chunked_upload(upload_id, metadata)

    # Ensure all chunks were deleted.
    for chunk in metadata[_CHUNKS_KEY]:
      self.assertFalse(self.engine.exists(chunk.path))


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