# coding: utf-8
from __future__ import unicode_literals
from .common import InfoExtractor
import re


class BlenderCloudBaseIE(InfoExtractor):
    # A video on the Blender Cloud site is referenced by a single alphanumeric node,
    # i.e. '56041550044a2a00d0d7e068'
    #
    # The data we want for any given node ID can be fetched at:
    url_node = "https://cloud.blender.org/nodes/%s/view"
    
    # TODO: Add authentication scheme for subscriber-only videos.
    #
    # This will require the use of a (paid) Blender ID token available from:
    # https://store.blender.org/product/membership/
    #
    # For now - ignore any subscriber-only videos and just grab the public ones.
    warning_subscribers_only = 'Only available to Blender Cloud subscribers.'
    warning_no_video_sources = 'No video sources available.'

    def get_node_title(self, source):
        node_title = None
        node_title = self._html_search_regex(
            r'<div\s*id=\"node-title\"\s*class=\"node-title\">(.*?)</div>', source, 'title').strip()
        return node_title

    def get_webpage_title(self, source):
        webpage_title = None
        webpage_title = self._html_search_regex(
            r'<title>(.*?)</title>', source, 'title').strip()
        return webpage_title

    @staticmethod
    def is_video_subscriber_only(source):
        errmsg_subscribers_only = 'Only available to Blender Cloud subscribers.'
        return True if errmsg_subscribers_only in source else False

    @staticmethod
    def get_video_formats(source):
        video_formats = []
        for video in re.findall(r'<source\s*src=\"(.*?)\"\s*type="video/(.*?)"', source):
            video_url = video[0].replace('&amp;', '&')
            video_format_id = video[1].upper()
            fmt = {
                'url': video_url,
                'format_id': video_format_id,
                'quality': 2 if video_format_id == 'MP4' else 1,
            }
            video_formats.append(fmt)
        return video_formats


class BlenderCloudIE(BlenderCloudBaseIE):
    _VALID_URL = r'https?://cloud\.blender\.org/[^/]+/(?P<display_id>[0-9a-z-]+)/(?P<base_node_id>[0-9a-z]+)/?'
    _TESTS = [
        {
            # Single video
            'url': 'https://cloud.blender.org/p/game-asset-creation/56041550044a2a00d0d7e068',
            'info_dict': {
                'id': '56041550044a2a00d0d7e068',
                'display_id': 'game-asset-creation',
                'ext': 'mp4',
                'title': 'Introduction',
            },
        },
        {
            # Playlist (subsection)
            'url': 'https://cloud.blender.org/p/game-asset-creation/56041550044a2a00d0d7e069',
            'info_dict': {
                'id': '56041550044a2a00d0d7e069',
                'title': 'Section 1 - Understanding the Interface',
            },
            'playlist': [
                {
                    'info_dict': {
                        'id': '56041550044a2a00d0d7e06a',
                        'display_id': 'game-asset-creation',
                        'ext': 'mp4',
                        'title': 'Chapter 01 - First Encounters',
                    },
                },
                {
                    'info_dict': {
                        'id': '56041550044a2a00d0d7e06b',
                        'display_id': 'game-asset-creation',
                        'ext': 'mp4',
                        'title': 'Chapter 02 - Navigation',
                    },
                },
                {
                    'info_dict': {
                        'id': '56041550044a2a00d0d7e06c',
                        'display_id': 'game-asset-creation',
                        'ext': 'mp4',
                        'title': 'Chapter 03 - Layout Customizing',
                    },
                },
                {
                    'info_dict': {
                        'id': '56041550044a2a00d0d7e06d',
                        'display_id': 'game-asset-creation',
                        'ext': 'mp4',
                        'title': 'Chapter 04 - User Preference Changes',
                    },
                },
            ],
        },
        {
            # Playlist (subsection)
            'url': 'https://cloud.blender.org/p/creature-factory-2/5604151f044a2a00caa7b04b',
            'info_dict': {
                'id': '5604151f044a2a00caa7b04b',
                'title': '01 - First steps',
            },
            'playlist': [
                {
                    'info_dict': {
                        'id': '5604151f044a2a00caa7b04c',
                        'display_id': 'creature-factory-2',
                        'ext': 'mp4',
                        'title': 'Introduction',
                    },
                },
            ],
            'expected_warnings': [
                'Only available to Blender Cloud subscribers.'
            ],
        },
    ]

    def _real_extract(self, url):
        # extract a single video -or- a playlist of subsection videos
        mobj = re.match(self._VALID_URL, url)
        base_node_id = mobj.group('base_node_id')
        display_id = mobj.group('display_id')
        webpage = self._download_webpage(self.url_node % base_node_id, base_node_id)

        if '<section class="node-preview video">' in webpage:
            # this base node references a single video (i.e. a single node)
            title = None
            formats = []
            if self.is_video_subscriber_only(webpage):
                self.report_warning('%s - %s' % (base_node_id, self.warning_subscribers_only))
            else:
                title = self.get_node_title(webpage)
                formats = self.get_video_formats(webpage)
                self._sort_formats(formats)
            return {
                'id': base_node_id,
                'display_id': display_id,
                'title': title,
                'formats': formats,
            }
        elif '<section class="node-preview group">' in webpage:
            # this base node references a playlist of subsection videos (i.e. multiple nodes)
            entries = []
            for node_id in re.findall(r'data-node_id=\"([0-9a-z]+)\"\s*title=\"', webpage):
                webpage_node = self._download_webpage(self.url_node % node_id, node_id)
                if '<section class="node-preview video">' in webpage_node:
                    if self.is_video_subscriber_only(webpage_node):
                        self.report_warning('%s - %s' % (node_id, self.warning_subscribers_only))
                    else:
                        title = self.get_node_title(webpage_node)
                        formats = self.get_video_formats(webpage_node)
                        self._sort_formats(formats)
                        entries.append({
                            'id': node_id,
                            'display_id': display_id,
                            'title': title,
                            'formats': formats,
                        })
                else:
                    self.report_warning('%s - %s' % (node_id, warning_no_video_sources))
            return self.playlist_result(entries, playlist_id=base_node_id, playlist_title=self.get_node_title(webpage))
        else:
            self.report_warning('%s - %s' % (base_node_id, self.warning_no_video_sources))
            return {
                'id': base_node_id,
                'display_id': display_id,
                'title': None,
                'formats': [],
            }


class BlenderCloudPlaylistIE(BlenderCloudBaseIE):
    _VALID_URL = r'https?://cloud\.blender\.org/[^/]+/(?P<display_id>[0-9a-z-]+)/?$'
    _TESTS = [
        {
            # Playlist (complete)
            'url': 'https://cloud.blender.org/p/blenderella',
            'info_dict': {
                'id': 'blenderella',
                'title': 'Learn Character Modeling — Blender Cloud',
            },
            'playlist': [
                {
                    'info_dict': {
                        'id': '56040ecf044a2a00a515adb0',
                        'display_id': 'blenderella',
                        'ext': 'mp4',
                        'title': '10 - Cheek, Jaw, Forehead, Scalp',
                    },
                },
            ],
            'expected_warnings': [
                'Only available to Blender Cloud subscribers.',
                'No video sources available.'
            ],
        },
    ]

    def _real_extract(self, url):
        # extract the complete playlist for an entire video section
        mobj = re.match(self._VALID_URL, url)
        display_id = mobj.group('display_id')
        webpage = self._download_webpage(url, display_id)

        entries = []
        for node_id in re.findall(r'data-node_id=\"([0-9a-z]+)\"\s*class=\"', webpage):
            webpage_node = self._download_webpage(self.url_node % node_id, node_id)
            if '<section class="node-preview video">' in webpage_node:
                # this node references a single video (i.e. a single node)
                if self.is_video_subscriber_only(webpage_node):
                    self.report_warning('%s - %s' % (node_id, self.warning_subscribers_only))
                else:
                    title = self.get_node_title(webpage_node)
                    formats = self.get_video_formats(webpage_node)
                    self._sort_formats(formats)
                    entries.append({
                        'id': node_id,
                        'display_id': display_id,
                        'title': title,
                        'formats': formats,
                    })
            elif '<section class="node-preview group">' in webpage_node:
                # this node references a playlist of subsection videos (i.e. multiple nodes)
                for sub_node_id in re.findall(r'data-node_id=\"([0-9a-z]+)\"\s*title=\"', webpage_node):
                    webpage_sub_node = self._download_webpage(self.url_node % sub_node_id, sub_node_id)
                    if '<section class="node-preview video">' in webpage_sub_node:
                        if self.is_video_subscriber_only(webpage_sub_node):
                            self.report_warning('%s - %s' % (sub_node_id, self.warning_subscribers_only))
                        else:
                            title = self.get_node_title(webpage_sub_node)
                            formats = self.get_video_formats(webpage_sub_node)
                            self._sort_formats(formats)
                            entries.append({
                                'id': sub_node_id,
                                'display_id': display_id,
                                'title': title,
                                'formats': formats,
                            })
                    else:
                        self.report_warning('%s - %s' % (sub_node_id, self.warning_no_video_sources))
            else:
                self.report_warning('%s - %s' % (node_id, self.warning_no_video_sources))
        return self.playlist_result(entries, playlist_id=display_id, playlist_title=self.get_webpage_title(webpage))