#!/usr/bin/env python
# 
# Upload videos to Youtube from the command-line using APIv3.
#
# Author: Arnau Sanchez <pyarnau@gmail.com>
# Project: https://github.com/tokland/youtube-upload
"""
Upload a video to Youtube from the command-line.

    $ youtube-upload --title="A.S. Mutter playing" \
                     --description="Anne Sophie Mutter plays Beethoven" \
                     --category=Music \
                     --tags="mutter, beethoven" \
                     anne_sophie_mutter.flv
    pxzZ-fYjeYs
"""

import os
import sys
import optparse
import collections
import webbrowser

import googleapiclient.errors
import oauth2client

from . import auth
from . import upload_video
from . import categories
from . import lib
from . import playlists

# http://code.google.com/p/python-progressbar (>= 2.3)
try:
    import progressbar
except ImportError:
    progressbar = None

class InvalidCategory(Exception): pass
class OptionsError(Exception): pass
class AuthenticationError(Exception): pass
class RequestError(Exception): pass

EXIT_CODES = {
    OptionsError: 2,
    InvalidCategory: 3,
    RequestError: 3,
    AuthenticationError: 4,
    oauth2client.client.FlowExchangeError: 4,
    NotImplementedError: 5,
}

WATCH_VIDEO_URL = "https://www.youtube.com/watch?v={id}"

debug = lib.debug
struct = collections.namedtuple

def open_link(url):
    """Opens a URL link in the client's browser."""
    webbrowser.open(url)
    
def get_progress_info():
    """Return a function callback to update the progressbar."""
    progressinfo = struct("ProgressInfo", ["callback", "finish"])

    if progressbar:
        bar = progressbar.ProgressBar(widgets=[
            progressbar.Percentage(), ' ',
            progressbar.Bar(), ' ',
            progressbar.ETA(), ' ',
            progressbar.FileTransferSpeed(),
        ])
        def _callback(total_size, completed):
            if not hasattr(bar, "next_update"):
                if hasattr(bar, "maxval"):
                    bar.maxval = total_size
                else:
                    bar.max_value = total_size
                bar.start()
            bar.update(completed)
        def _finish():
            if hasattr(bar, "next_update"):
                return bar.finish()
        return progressinfo(callback=_callback, finish=_finish)
    else:
        return progressinfo(callback=None, finish=lambda: True)

def get_category_id(category):
    """Return category ID from its name."""
    if category:
        if category in categories.IDS:
            ncategory = categories.IDS[category]
            debug("Using category: {0} (id={1})".format(category, ncategory))
            return str(categories.IDS[category])
        else:
            msg = "{0} is not a valid category".format(category)
            raise InvalidCategory(msg)

def upload_youtube_video(youtube, options, video_path, total_videos, index):
    """Upload video with index (for split videos)."""
    u = lib.to_utf8
    title = u(options.title)
    if hasattr(u('string'), 'decode'):   
        description = u(options.description or "").decode("string-escape")
    else:
        description = options.description
    if options.publish_at:    
      debug("Your video will remain private until specified date.")
      
    tags = [u(s.strip()) for s in (options.tags or "").split(",")]
    ns = dict(title=title, n=index+1, total=total_videos)
    title_template = u(options.title_template)
    complete_title = (title_template.format(**ns) if total_videos > 1 else title)
    progress = get_progress_info()
    category_id = get_category_id(options.category)
    request_body = {
        "snippet": {
            "title": complete_title,
            "description": description,
            "categoryId": category_id,
            "tags": tags,
            "defaultLanguage": options.default_language,
            "defaultAudioLanguage": options.default_audio_language,

        },
        "status": {
            "privacyStatus": ("private" if options.publish_at else options.privacy),
            "publishAt": options.publish_at,

        },
        "recordingDetails": {
            "location": lib.string_to_dict(options.location),
            "recordingDate": options.recording_date,
        },
    }

    debug("Start upload: {0}".format(video_path))
    try:
        video_id = upload_video.upload(youtube, video_path, 
            request_body, progress_callback=progress.callback)
    finally:
        progress.finish()
    return video_id

def get_youtube_handler(options):
    """Return the API Youtube object."""
    home = os.path.expanduser("~")
    default_client_secrets = lib.get_first_existing_filename(
        [sys.prefix, os.path.join(sys.prefix, "local")],
        "share/youtube_upload/client_secrets.json")  
    default_credentials = os.path.join(home, ".youtube-upload-credentials.json")
    client_secrets = options.client_secrets or default_client_secrets or \
        os.path.join(home, ".client_secrets.json")
    credentials = options.credentials_file or default_credentials
    debug("Using client secrets: {0}".format(client_secrets))
    debug("Using credentials file: {0}".format(credentials))
    get_code_callback = (auth.browser.get_code 
        if options.auth_browser else auth.console.get_code)
    return auth.get_resource(client_secrets, credentials,
        get_code_callback=get_code_callback)

def parse_options_error(parser, options):
    """Check errors in options."""
    required_options = ["title"]
    missing = [opt for opt in required_options if not getattr(options, opt)]
    if missing:
        parser.print_usage()
        msg = "Some required option are missing: {0}".format(", ".join(missing))
        raise OptionsError(msg)

def run_main(parser, options, args, output=sys.stdout):
    """Run the main scripts from the parsed options/args."""
    parse_options_error(parser, options)
    youtube = get_youtube_handler(options)

    if youtube:
        for index, video_path in enumerate(args):
            video_id = upload_youtube_video(youtube, options, video_path, len(args), index)
            video_url = WATCH_VIDEO_URL.format(id=video_id)
            debug("Video URL: {0}".format(video_url))
            if options.open_link:
                open_link(video_url) #Opens the Youtube Video's link in a webbrowser
                
            if options.thumb:
                youtube.thumbnails().set(videoId=video_id, media_body=options.thumb).execute()
            if options.playlist:
                playlists.add_video_to_playlist(youtube, video_id, 
                    title=lib.to_utf8(options.playlist), privacy=options.privacy)
            output.write(video_id + "\n")
    else:
        raise AuthenticationError("Cannot get youtube resource")

def main(arguments):
    """Upload videos to Youtube."""
    usage = """Usage: %prog [OPTIONS] VIDEO [VIDEO2 ...]

    Upload videos to Youtube."""
    parser = optparse.OptionParser(usage)

    # Video metadata
    parser.add_option('-t', '--title', dest='title', type="string",
        help='Video title')
    parser.add_option('-c', '--category', dest='category', type="string",
        help='Video category')
    parser.add_option('-d', '--description', dest='description', type="string",
        help='Video description')
    parser.add_option('', '--tags', dest='tags', type="string",
        help='Video tags (separated by commas: "tag1, tag2,...")')
    parser.add_option('', '--privacy', dest='privacy', metavar="STRING",
        default="public", help='Privacy status (public | unlisted | private)')
    parser.add_option('', '--publish-at', dest='publish_at', metavar="datetime",
       default=None, help='Publish date (ISO 8601): YYYY-MM-DDThh:mm:ss.sZ')
    parser.add_option('', '--location', dest='location', type="string",
        default=None, metavar="latitude=VAL,longitude=VAL[,altitude=VAL]",
        help='Video location"')
    parser.add_option('', '--recording-date', dest='recording_date', metavar="datetime",
        default=None, help="Recording date (ISO 8601): YYYY-MM-DDThh:mm:ss.sZ")
    parser.add_option('', '--default-language', dest='default_language', type="string",
        default=None, metavar="string", 
        help="Default language (ISO 639-1: en | fr | de | ...)")
    parser.add_option('', '--default-audio-language', dest='default_audio_language', type="string",
        default=None, metavar="string", 
        help="Default audio language (ISO 639-1: en | fr | de | ...)")
    parser.add_option('', '--thumbnail', dest='thumb', type="string",
        help='Video thumbnail')
    parser.add_option('', '--playlist', dest='playlist', type="string",
        help='Playlist title (if it does not exist, it will be created)')
    parser.add_option('', '--title-template', dest='title_template',
        type="string", default="{title} [{n}/{total}]", metavar="string",
        help='Template for multiple videos (default: {title} [{n}/{total}])')

    # Authentication
    parser.add_option('', '--client-secrets', dest='client_secrets',
        type="string", help='Client secrets JSON file')
    parser.add_option('', '--credentials-file', dest='credentials_file',
        type="string", help='Credentials JSON file')
    parser.add_option('', '--auth-browser', dest='auth_browser', action='store_true',
        help='Open a GUI browser to authenticate if required')

    #Additional options
    parser.add_option('', '--open-link', dest='open_link', action='store_true',
        help='Opens a url in a web browser to display the uploaded video')

    options, args = parser.parse_args(arguments)
    try:
        run_main(parser, options, args)
    except googleapiclient.errors.HttpError as error:
        raise RequestError("Server response: {0}".format(bytes.decode(error.content).strip()))

def run():
    sys.exit(lib.catch_exceptions(EXIT_CODES, main, sys.argv[1:]))
  
if __name__ == '__main__':
    run()