from __future__ import unicode_literals

import errno
import os
import socket
import time

from .common import FileDownloader
from ..compat import (
    compat_urllib_request,
    compat_urllib_error,
)
from ..utils import (
    ContentTooShortError,
    encodeFilename,
    sanitize_open,
)


class HttpFD(FileDownloader):
    def real_download(self, filename, info_dict):
        url = info_dict['url']
        tmpfilename = self.temp_name(filename)
        stream = None

        # Do not include the Accept-Encoding header
        headers = {'Youtubedl-no-compression': 'True'}
        add_headers = info_dict.get('http_headers')
        if add_headers:
            headers.update(add_headers)
        basic_request = compat_urllib_request.Request(url, None, headers)
        request = compat_urllib_request.Request(url, None, headers)

        is_test = self.params.get('test', False)

        if is_test:
            request.add_header('Range', 'bytes=0-%s' % str(self._TEST_FILE_SIZE - 1))

        # Establish possible resume length
        if os.path.isfile(encodeFilename(tmpfilename)):
            resume_len = os.path.getsize(encodeFilename(tmpfilename))
        else:
            resume_len = 0

        open_mode = 'wb'
        if resume_len != 0:
            if self.params.get('continuedl', True):
                self.report_resuming_byte(resume_len)
                request.add_header('Range', 'bytes=%d-' % resume_len)
                open_mode = 'ab'
            else:
                resume_len = 0

        count = 0
        retries = self.params.get('retries', 0)
        while count <= retries:
            # Establish connection
            try:
                data = self.ydl.urlopen(request)
                break
            except (compat_urllib_error.HTTPError, ) as err:
                if (err.code < 500 or err.code >= 600) and err.code != 416:
                    # Unexpected HTTP error
                    raise
                elif err.code == 416:
                    # Unable to resume (requested range not satisfiable)
                    try:
                        # Open the connection again without the range header
                        data = self.ydl.urlopen(basic_request)
                        content_length = data.info()['Content-Length']
                    except (compat_urllib_error.HTTPError, ) as err:
                        if err.code < 500 or err.code >= 600:
                            raise
                    else:
                        # Examine the reported length
                        if (content_length is not None and
                                (resume_len - 100 < int(content_length) < resume_len + 100)):
                            # The file had already been fully downloaded.
                            # Explanation to the above condition: in issue #175 it was revealed that
                            # YouTube sometimes adds or removes a few bytes from the end of the file,
                            # changing the file size slightly and causing problems for some users. So
                            # I decided to implement a suggested change and consider the file
                            # completely downloaded if the file size differs less than 100 bytes from
                            # the one in the hard drive.
                            self.report_file_already_downloaded(filename)
                            self.try_rename(tmpfilename, filename)
                            self._hook_progress({
                                'filename': filename,
                                'status': 'finished',
                                'downloaded_bytes': resume_len,
                                'total_bytes': resume_len,
                            })
                            return True
                        else:
                            # The length does not match, we start the download over
                            self.report_unable_to_resume()
                            resume_len = 0
                            open_mode = 'wb'
                            break
            except socket.error as e:
                if e.errno != errno.ECONNRESET:
                    # Connection reset is no problem, just retry
                    raise

            # Retry
            count += 1
            if count <= retries:
                self.report_retry(count, retries)

        if count > retries:
            self.report_error('giving up after %s retries' % retries)
            return False

        data_len = data.info().get('Content-length', None)

        # Range HTTP header may be ignored/unsupported by a webserver
        # (e.g. extractor/scivee.py, extractor/bambuser.py).
        # However, for a test we still would like to download just a piece of a file.
        # To achieve this we limit data_len to _TEST_FILE_SIZE and manually control
        # block size when downloading a file.
        if is_test and (data_len is None or int(data_len) > self._TEST_FILE_SIZE):
            data_len = self._TEST_FILE_SIZE

        if data_len is not None:
            data_len = int(data_len) + resume_len
            min_data_len = self.params.get("min_filesize", None)
            max_data_len = self.params.get("max_filesize", None)
            if min_data_len is not None and data_len < min_data_len:
                self.to_screen('\r[download] File is smaller than min-filesize (%s bytes < %s bytes). Aborting.' % (data_len, min_data_len))
                return False
            if max_data_len is not None and data_len > max_data_len:
                self.to_screen('\r[download] File is larger than max-filesize (%s bytes > %s bytes). Aborting.' % (data_len, max_data_len))
                return False

        byte_counter = 0 + resume_len
        block_size = self.params.get('buffersize', 1024)
        start = time.time()

        # measure time over whole while-loop, so slow_down() and best_block_size() work together properly
        now = None  # needed for slow_down() in the first loop run
        before = start  # start measuring
        while True:

            # Download and write
            data_block = data.read(block_size if not is_test else min(block_size, data_len - byte_counter))
            byte_counter += len(data_block)

            # exit loop when download is finished
            if len(data_block) == 0:
                break

            # Open destination file just in time
            if stream is None:
                try:
                    (stream, tmpfilename) = sanitize_open(tmpfilename, open_mode)
                    assert stream is not None
                    filename = self.undo_temp_name(tmpfilename)
                    self.report_destination(filename)
                except (OSError, IOError) as err:
                    self.report_error('unable to open for writing: %s' % str(err))
                    return False

                if self.params.get('xattr_set_filesize', False) and data_len is not None:
                    try:
                        import xattr
                        xattr.setxattr(tmpfilename, 'user.ytdl.filesize', str(data_len))
                    except(OSError, IOError, ImportError) as err:
                        self.report_error('unable to set filesize xattr: %s' % str(err))

            try:
                stream.write(data_block)
            except (IOError, OSError) as err:
                self.to_stderr('\n')
                self.report_error('unable to write data: %s' % str(err))
                return False

            # Apply rate limit
            self.slow_down(start, now, byte_counter - resume_len)

            # end measuring of one loop run
            now = time.time()
            after = now

            # Adjust block size
            if not self.params.get('noresizebuffer', False):
                block_size = self.best_block_size(after - before, len(data_block))

            before = after

            # Progress message
            speed = self.calc_speed(start, now, byte_counter - resume_len)
            if data_len is None:
                eta = None
            else:
                eta = self.calc_eta(start, time.time(), data_len - resume_len, byte_counter - resume_len)

            self._hook_progress({
                'status': 'downloading',
                'downloaded_bytes': byte_counter,
                'total_bytes': data_len,
                'tmpfilename': tmpfilename,
                'filename': filename,
                'eta': eta,
                'speed': speed,
                'elapsed': now - start,
            })

            if is_test and byte_counter == data_len:
                break

        if stream is None:
            self.to_stderr('\n')
            self.report_error('Did not get any data blocks')
            return False
        if tmpfilename != '-':
            stream.close()

        if data_len is not None and byte_counter != data_len:
            raise ContentTooShortError(byte_counter, int(data_len))
        self.try_rename(tmpfilename, filename)

        # Update file modification time
        if self.params.get('updatetime', True):
            info_dict['filetime'] = self.try_utime(filename, data.info().get('last-modified', None))

        self._hook_progress({
            'downloaded_bytes': byte_counter,
            'total_bytes': byte_counter,
            'filename': filename,
            'status': 'finished',
            'elapsed': time.time() - start,
        })

        return True
