#!/usr/bin/env python
# -*- coding: utf-8 -*-

import re
import subprocess
import os
from urllib import unquote

from module.utils import html_unescape
from module.plugins.Hoster import Hoster


def which(program):
    """Works exactly like the unix command which

    Courtesy of http://stackoverflow.com/a/377028/675646"""

    def is_exe(fpath):
        return os.path.isfile(fpath) and os.access(fpath, os.X_OK)

    fpath, fname = os.path.split(program)
    if fpath:
        if is_exe(program):
            return program
    else:
        for path in os.environ["PATH"].split(os.pathsep):
            path = path.strip('"')
            exe_file = os.path.join(path, program)
            if is_exe(exe_file):
                return exe_file

    return None


class YoutubeCom(Hoster):
    __name__ = "YoutubeCom"
    __type__ = "hoster"
    __pattern__ = r"https?://(?:[^/]*?)youtube\.com/watch.*?[?&]v=.*"
    __version__ = "0.38"
    __config__ = [("quality", "sd;hd;fullhd;240p;360p;480p;720p;1080p;3072p", "Quality Setting", "hd"),
                  ("fmt", "int", "FMT/ITAG Number (5-102, 0 for auto)", 0),
                  (".mp4", "bool", "Allow .mp4", True),
                  (".flv", "bool", "Allow .flv", True),
                  (".webm", "bool", "Allow .webm", False),
                  (".3gp", "bool", "Allow .3gp", False),
                  ("3d", "bool", "Prefer 3D", False)]
    __description__ = """Youtube.com Video Download Hoster"""
    __author_name__ = ("spoob", "zoidberg")
    __author_mail__ = ("spoob@pyload.org", "zoidberg@mujmail.cz")

    # name, width, height, quality ranking, 3D
    formats = {5: (".flv", 400, 240, 1, False),
               6: (".flv", 640, 400, 4, False),
               17: (".3gp", 176, 144, 0, False),
               18: (".mp4", 480, 360, 2, False),
               22: (".mp4", 1280, 720, 8, False),
               43: (".webm", 640, 360, 3, False),
               34: (".flv", 640, 360, 4, False),
               35: (".flv", 854, 480, 6, False),
               36: (".3gp", 400, 240, 1, False),
               37: (".mp4", 1920, 1080, 9, False),
               38: (".mp4", 4096, 3072, 10, False),
               44: (".webm", 854, 480, 5, False),
               45: (".webm", 1280, 720, 7, False),
               46: (".webm", 1920, 1080, 9, False),
               82: (".mp4", 640, 360, 3, True),
               83: (".mp4", 400, 240, 1, True),
               84: (".mp4", 1280, 720, 8, True),
               85: (".mp4", 1920, 1080, 9, True),
               100: (".webm", 640, 360, 3, True),
               101: (".webm", 640, 360, 4, True),
               102: (".webm", 1280, 720, 8, True)}

    def setup(self):
        self.resumeDownload = self.multiDL = True

    def process(self, pyfile):
        html = self.load(pyfile.url, decode=True)

        if re.search(r'<div id="player-unavailable" class="\s*player-width player-height\s*">', html):
            self.offline()

        if "We have been receiving a large volume of requests from your network." in html:
            self.tempOffline()

        #get config
        use3d = self.getConfig("3d")
        if use3d:
            quality = {"sd": 82, "hd": 84, "fullhd": 85, "240p": 83, "360p": 82,
                       "480p": 82, "720p": 84, "1080p": 85, "3072p": 85}
        else:
            quality = {"sd": 18, "hd": 22, "fullhd": 37, "240p": 5, "360p": 18,
                       "480p": 35, "720p": 22, "1080p": 37, "3072p": 38}
        desired_fmt = self.getConfig("fmt")
        if desired_fmt and desired_fmt not in self.formats:
            self.logWarning("FMT %d unknown - using default." % desired_fmt)
            desired_fmt = 0
        if not desired_fmt:
            desired_fmt = quality.get(self.getConfig("quality"), 18)

        #parse available streams
        streams = re.search(r'"url_encoded_fmt_stream_map": "(.*?)",', html).group(1)
        streams = [x.split('\u0026') for x in streams.split(',')]
        streams = [dict((y.split('=', 1)) for y in x) for x in streams]
        streams = [(int(x['itag']), "%s&signature=%s" % (unquote(x['url']), x['sig'])) for x in streams]
        #self.logDebug("Found links: %s" % streams)
        self.logDebug("AVAILABLE STREAMS: %s" % [x[0] for x in streams])

        #build dictionary of supported itags (3D/2D)
        allowed = lambda x: self.getConfig(self.formats[x][0])
        streams = [x for x in streams if x[0] in self.formats and allowed(x[0])]
        if not streams:
            self.fail("No available stream meets your preferences")
        fmt_dict = dict([x for x in streams if self.formats[x[0]][4] == use3d] or streams)

        self.logDebug("DESIRED STREAM: ITAG:%d (%s) %sfound, %sallowed" %
                      (desired_fmt, "%s %dx%d Q:%d 3D:%s" % self.formats[desired_fmt],
                       "" if desired_fmt in fmt_dict else "NOT ", "" if allowed(desired_fmt) else "NOT "))

        #return fmt nearest to quality index
        if desired_fmt in fmt_dict and allowed(desired_fmt):
            fmt = desired_fmt
        else:
            sel = lambda x: self.formats[x][3]  # select quality index
            comp = lambda x, y: abs(sel(x) - sel(y))

            self.logDebug("Choosing nearest fmt: %s" % [(x, allowed(x), comp(x, desired_fmt)) for x in fmt_dict.keys()])
            fmt = reduce(lambda x, y: x if comp(x, desired_fmt) <= comp(y, desired_fmt) and
                         sel(x) > sel(y) else y, fmt_dict.keys())

        self.logDebug("Chosen fmt: %s" % fmt)
        url = fmt_dict[fmt]
        self.logDebug("URL: %s" % url)

        #set file name
        file_suffix = self.formats[fmt][0] if fmt in self.formats else ".flv"
        file_name_pattern = '<meta name="title" content="(.+?)">'
        name = re.search(file_name_pattern, html).group(1).replace("/", "")

        # Cleaning invalid characters from the file name
        name = name.encode('ascii', 'replace')

        pyfile.name = html_unescape(name)

        time = re.search(r"t=((\d+)m)?(\d+)s", pyfile.url)
        ffmpeg = which("ffmpeg")
        if ffmpeg and time:
            m, s = time.groups()[1:]
            if not m:
                m = "0"

            pyfile.name += " (starting at %s:%s)" % (m, s)
        pyfile.name += file_suffix

        filename = self.download(url)

        if ffmpeg and time:
            inputfile = filename + "_"
            os.rename(filename, inputfile)

            subprocess.call([
                ffmpeg,
                "-ss", "00:%s:%s" % (m, s),
                "-i", inputfile,
                "-vcodec", "copy",
                "-acodec", "copy",
                filename])
            os.remove(inputfile)