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import mimetypes
import urllib2

from webkitpy.common.net.network_transaction import NetworkTransaction


def get_mime_type(filename):
    return mimetypes.guess_type(filename)[0] or 'application/octet-stream'


# FIXME: Rather than taking tuples, this function should take more structured data.
def _encode_multipart_form_data(fields, files):
    """Encode form fields for multipart/form-data.

    Args:
      fields: A sequence of (name, value) elements for regular form fields.
      files: A sequence of (name, filename, value) elements for data to be
             uploaded as files.
    Returns:
      (content_type, body) ready for httplib.HTTP instance.

    Source:
      http://code.google.com/p/rietveld/source/browse/trunk/upload.py
    """
    BOUNDARY = '-M-A-G-I-C---B-O-U-N-D-A-R-Y-'
    CRLF = '\r\n'
    lines = []

    for key, value in fields:
        lines.append('--' + BOUNDARY)
        lines.append('Content-Disposition: form-data; name="%s"' % key)
        lines.append('')
        if isinstance(value, unicode):
            value = value.encode('utf-8')
        lines.append(value)

    for key, filename, value in files:
        lines.append('--' + BOUNDARY)
        lines.append('Content-Disposition: form-data; name="%s"; filename="%s"' % (key, filename))
        lines.append('Content-Type: %s' % get_mime_type(filename))
        lines.append('')
        if isinstance(value, unicode):
            value = value.encode('utf-8')
        lines.append(value)

    lines.append('--' + BOUNDARY + '--')
    lines.append('')
    body = CRLF.join(lines)
    content_type = 'multipart/form-data; boundary=%s' % BOUNDARY
    return content_type, body


class FileUploader(object):

    def __init__(self, url, timeout_seconds):
        self._url = url
        self._timeout_seconds = timeout_seconds

    def upload_single_text_file(self, filesystem, content_type, filename):
        return self._upload_data(content_type, filesystem.read_text_file(filename))

    def upload_as_multipart_form_data(self, filesystem, files, attrs):
        file_objs = []
        for filename, path in files:
            file_objs.append(('file', filename, filesystem.read_binary_file(path)))

        # FIXME: We should use the same variable names for the formal and actual parameters.
        content_type, data = _encode_multipart_form_data(attrs, file_objs)
        return self._upload_data(content_type, data)

    def _upload_data(self, content_type, data):
        def callback():
            # FIXME: Setting a timeout, either globally using socket.setdefaulttimeout()
            # or in urlopen(), doesn't appear to work on Mac 10.5 with Python 2.7.
            # For now we will ignore the timeout value and hope for the best.
            request = urllib2.Request(self._url, data, {'Content-Type': content_type})
            return urllib2.urlopen(request)

        return NetworkTransaction(timeout_seconds=self._timeout_seconds).run(callback)