#!/usr/bin/env python
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from __future__ import with_statement

import codecs
import mimetypes
import socket
import urllib2

from webkitpy.common.net.networktransaction import NetworkTransaction

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


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 TestResultsUploader:
    def __init__(self, host):
        self._host = host

    def _upload_files(self, attrs, file_objs):
        url = "http://%s/testfile/upload" % self._host
        content_type, data = _encode_multipart_form_data(attrs, file_objs)
        headers = {"Content-Type": content_type}
        request = urllib2.Request(url, data, headers)
        urllib2.urlopen(request)

    def upload(self, params, files, timeout_seconds):
        file_objs = []
        for filename, path in files:
            with codecs.open(path, "rb") as file:
                file_objs.append(('file', filename, file.read()))

        orig_timeout = socket.getdefaulttimeout()
        try:
            socket.setdefaulttimeout(timeout_seconds)
            NetworkTransaction(timeout_seconds=timeout_seconds).run(
                lambda: self._upload_files(params, file_objs))
        finally:
            socket.setdefaulttimeout(orig_timeout)