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


"""
authored by: RaNaN
"""
import base64
import cookielib
import time
import urllib
import urllib2
from gzip import GzipFile

from Keepalive import HTTPHandler
from cStringIO import StringIO

"""
    handles all outgoing HTTP-Requests of the Server
    Usage: create Request Instance
    use retrieveURL and call it with a url at least
    additionaly you can firstly pass the get and secondly the post data in form of a dictonary
    when the last argument is true the handler simulate a http referer with the last called url.
    retrieveUrl returns response as string

"""
class AbortDownload(Exception):
    pass

class Request:
    def __init__(self):

        self.dl_time = 0
        self.dl_finished = 0
        self.dl_size = 0
        self.dl_arrived = 0
        self.dl = False

        self.abort = False

        self.cookies = []
        self.lastURL = None
        self.cj = cookielib.CookieJar()
        handler = HTTPHandler()
        self.opener = urllib2.build_opener(handler, urllib2.HTTPCookieProcessor(self.cj))
        self.downloader = urllib2.build_opener()
        #self.opener.add_handler()

        self.opener.addheaders = [
        ("User-Agent", "Mozilla/5.0 (Windows; U; Windows NT 5.1; en; rv:1.9.0.8) Gecko/2009032609 Firefox/3.0.10"),
        ("Accept-Encoding", "deflate"),
        ("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"),
        ("Accept-Charset", "ISO-8859-1,utf-8;q=0.7,*;q=0.7"),
        ("Connection", "keep-alive"),
        ("Keep-Alive", "300")]

        self.downloader.addheaders = [
        ("User-Agent", "Mozilla/5.0 (Windows; U; Windows NT 5.1; en; rv:1.9.0.8) Gecko/2009032609 Firefox/3.0.10"),
        ("Accept-Encoding", "deflate"),
        ("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"),
        ("Accept-Charset", "ISO-8859-1,utf-8;q=0.7,*;q=0.7")]


    def load(self, url, get={}, post={}, ref=True, cookies=False):

        if post:
            post = urllib.urlencode(post)
        else:
            post = None

        if get:
            get = urllib.urlencode(get)
        else:
            get = ""

        url = url + get
        req = urllib2.Request(url, data=post)

        if ref and self.lastURL is not None:
            req.add_header("Referer", self.lastURL)

        if cookies:
            self.add_cookies(req)
            #add cookies

        rep = self.opener.open(req)

        for cookie in self.cj.make_cookies(rep, req):
            self.cookies.append(cookie)

        output = rep.read()

        if rep.headers.has_key("content-encoding"):
            if rep.headers["content-encoding"] == "gzip":
                output = GzipFile('', 'r', 0, StringIO(output)).read()

        self.lastURL = url

        return output

    def add_auth(self, user, pw):
        self.downloader.addheaders.append(['Authorization', 'Basic ' + base64.encodestring(user + ':' + pw)[:-1]])

    def add_cookies(self, req):
        cookie_head = ""
        for cookie in self.cookies:
            cookie_head += cookie.name + "=" + cookie.value + "; "
        req.add_header("Cookie", cookie_head)
    #def download(url, filename, reporthook = None, data = None): #default von urlretrieve auch None?
        #  return self.downloader.urlretrieve(url, filename, reporthook, data)

    def add_proxy(self, protocol, adress):
        handler = urllib2.ProxyHandler({protocol: adress})
        self.opener.add_handler(handler)
        self.downloader.add_handler(handler)

    def download(self, url, filename, get={}, post={}, ref=True, cookies=False):

        if post:
            post = urllib.urlencode(post)
        else:
            post = None

        if get:
            get = urllib.urlencode(get)
        else:
            get = ""

        url = url + get
        req = urllib2.Request(url, data=post)

        if ref and self.lastURL is not None:
            req.add_header("Referer", self.lastURL)

        if cookies:
            self.add_cookies(req)
            #add cookies
            rep = self.opener.open(req)

            for cookie in self.cj.make_cookies(rep, req):
                self.cookies.append(cookie)

        if not self.dl:
            self.dl = True
            file = open(filename, 'wb')
            conn = self.downloader.open(req, post)
            if conn.headers.has_key("content-length"):
                self.dl_size = int(conn.headers["content-length"])
            else:
                self.dl_size = 0
            self.dl_arrived = 0
            self.dl_time = time.time()
            for chunk in conn:
                if self.abort: raise AbortDownload
                self.dl_arrived += len(chunk)
                file.write(chunk)

            file.close()
            self.dl = False
            self.dl_finished = time.time()
            return True

    def get_speed(self):
        try:
            return (self.dl_arrived / ((time.time() if self.dl else self.dl_finished)  - self.dl_time)) / 1024
        except:
            return 0

    def get_ETA(self):
        try:
            return (self.dl_size - self.dl_arrived) / (self.dl_arrived / (time.time() - self.dl_time))
        except:
            return 0

    def kB_left(self):
        return (self.dl_size - self.dl_arrived) / 1024

if __name__ == "__main__":
    import doctest
    doctest.testmod()