#!/usr/bin/env python
from __future__ import division, with_statement

from contextlib import closing
import json
import os
import sys
import time
import tarfile
import urllib2
import SimpleHTTPServer
import SocketServer
from threading import Thread


PORT = 9841
static_dir = os.path.normpath(os.path.abspath(os.path.dirname(__file__)))

def makedirs(dirname):
    if not os.path.exists(dirname):
        os.makedirs(dirname)

class Handler(SimpleHTTPServer.SimpleHTTPRequestHandler):
    def do_OPTIONS(self):
        self.send_response(200, 'OK')
        self.send_header('Allow', 'GET, POST, OPTIONS')
        self.send_header('Access-Control-Allow-Origin', '*')
        self.send_header('Access-Control-Allow-Headers', 'X-Requested-With')
        self.send_header('Content-Length', '0')
        self.end_headers()

    def do_GET(self):

        if self.path == '/status':
            content = json.dumps(self.server.install.status)
            self.send_response(200, 'OK')
        else:
            path = os.path.join(static_dir, 'index.html' if self.path == '/' else self.path[1:])
            if os.path.exists(path):
                with open(path) as fd:
                    content = fd.read()
                self.send_response(200, 'OK')
                content_type = {
                    'html': 'text/html',
                    'png': 'image/png',
                    'svg': 'image/svg+xml',
                    'txt': 'text/plain',
                }.get(path.split('.')[-1], 'txt')
                self.send_header('Content-Type', content_type)
            else:
                self.send_response(404, 'not found')
                content = '404 not found'
        self.send_header('Access-Control-Allow-Origin', '*')
        self.send_header('Content-Length', str(len(content)))
        self.end_headers()
        self.wfile.write(content)


class Install(Thread):

    release_url = "http://downloads.openmedialibrary.com/release.json"
    status = {}

    def __init__(self, target, httpd):
        target = os.path.normpath(os.path.join(os.path.abspath(target)))
        self.target = target
        self.httpd = httpd
        Thread.__init__(self)
        self.daemon = True
        self.start()

    def run(self):
        target = self.target
        makedirs(target)
        os.chdir(target)
        release = self.get_release()
        self.status["release"] = release
        self.status["step"] = 'Downloading...'
        self.status["progress"] = 0
        for module in sorted(release['modules']):
            package_tar = release['modules'][module]['name']
            url = self.release_url.replace('release.json', package_tar)
            self.download(url, package_tar)
        self.status["step"] = 'Installing...'
        for module in sorted(release['modules']):
            package_tar = release['modules'][module]['name']
            tar = tarfile.open(package_tar)
            tar.extractall()
            tar.close()
            os.unlink(package_tar)
        os.symlink('openmedialibrary/ctl', 'ctl')
        makedirs('data')
        with open('data/release.json', 'w') as fd:
            json.dump(release, fd, indent=2)
        self.status = {"relaunch": True}
        os.system("./ctl start &")
        time.sleep(5)
        self.httpd.shutdown()

    def download(self, url, filename):
        dirname = os.path.dirname(filename)
        if dirname:
            makedirs(dirname)
        with open(filename, 'w') as f:
            with closing(urllib2.urlopen(url)) as u:
                size = int(u.headers.get('content-length', 0))
                self.status["size"] = size
                available = 0
                data = u.read(4096)
                while data:
                    if size:
                        available += len(data)
                        self.status["progress"] = available/size
                    f.write(data)
                    data = u.read(4096)

    def get_release(self):
        with closing(urllib2.urlopen(self.release_url)) as u:
            data = json.load(u)
        return data


if __name__ == '__main__':
    if len(sys.argv) == 1:
        target = os.path.expanduser("~/Library/Application Support/Open Media Library")
    elif len(sys.argv) != 2:
        print "usage: %s [target]" % sys.argv[0]
        sys.exit(1)
    else:
        target = sys.argv[1]
    SocketServer.TCPServer.allow_reuse_address = True
    httpd = SocketServer.TCPServer(("", PORT), Handler)
    install = Install(target, httpd)
    httpd.install = install
    httpd.serve_forever()