"""provides all lax instances management commands into a single utility script

"""

__docformat__ = "restructuredtext en"

import sys

import os

import os.path as osp

import time

import re

import urllib2

from urllib import urlencode

from Cookie import SimpleCookie

from logilab.common.clcommands import Command, register_commands, main_run

from cubicweb.uilib import remove_html_tags

from cubicweb.web.views.schema import SKIP_TYPES

APPLROOT = osp.abspath(osp.join(osp.dirname(osp.abspath(__file__)), '..'))

def initialize_vregistry(applroot):

    # apply monkey patches first

    from cubicweb.goa import do_monkey_patch

    do_monkey_patch()

    from cubicweb.goa.goavreg import GAEVregistry

    from cubicweb.goa.goaconfig import GAEConfiguration

    #WebConfiguration.ext_resources['JAVASCRIPTS'].append('DATADIR/goa.js')

    config = GAEConfiguration('toto', applroot)

    vreg = GAEVregistry(config)

    vreg.set_schema(config.load_schema())

    return vreg

def alistdir(directory):

    return [osp.join(directory, f) for f in os.listdir(directory)]

class LaxCommand(Command):

    """base command class for all lax commands

    creates vreg, schema and calls

    """

    min_args = max_args = 0

    def run(self, args):

        self.vreg = initialize_vregistry(APPLROOT)

        self._run(args)

class GenerateSchemaCommand(LaxCommand):

    """generates the schema's png file"""

    name = 'genschema'

    def _run(self, args):

        assert not args, 'no argument expected'

        from yams import schema2dot

        schema = self.vreg.schema

        path = osp.join(APPLROOT, 'data', 'schema.png')

        schema2dot.schema2dot(schema, path, #size=size,

                              skiptypes=SKIP_TYPES)

        print 'generated', path

        path = osp.join(APPLROOT, 'data', 'metaschema.png')

        schema2dot.schema2dot(schema, path)

        print 'generated', path

class PopulateDataDirCommand(LaxCommand):

    """populate instance's data directory according to used cubes"""

    name = 'populatedata'

    def _run(self, args):

        assert not args, 'no argument expected'

        # first clean everything which is a symlink from the data directory

        datadir = osp.join(APPLROOT, 'data')

        if not osp.exists(datadir):

            print 'created data directory'

            os.mkdir(datadir)

        for filepath in alistdir(datadir):

            if osp.islink(filepath):

                print 'removing', filepath

                os.remove(filepath)

        cubes = list(self.vreg.config.cubes()) + ['shared']

        for templ in cubes:

            templpath = self.vreg.config.cube_dir(templ)

            templdatadir = osp.join(templpath, 'data')

            if not osp.exists(templdatadir):

                print 'no data provided by', templ

                continue

            for resource in os.listdir(templdatadir):

                if resource == 'external_resources':

                    continue

                if not osp.exists(osp.join(datadir, resource)):

                    print 'symlinked %s from %s' % (resource, templ)

                    os.symlink(osp.join(templdatadir, resource),

                               osp.join(datadir, resource))

class NoRedirectHandler(urllib2.HTTPRedirectHandler):

    def http_error_302(self, req, fp, code, msg, headers):

        raise urllib2.HTTPError(req.get_full_url(), code, msg, headers, fp)

    http_error_301 = http_error_303 = http_error_307 = http_error_302

class GetSessionIdHandler(urllib2.HTTPRedirectHandler):

    def __init__(self, config):

        self.config = config

    def http_error_303(self, req, fp, code, msg, headers):

        cookie = SimpleCookie(headers['Set-Cookie'])

        sessionid = cookie['__session'].value

        print 'session id', sessionid

        setattr(self.config, 'cookie', '__session=' + sessionid)

        return 1 # on exception should be raised

class URLCommand(LaxCommand):

    """abstract class for commands doing stuff by accessing the web instance

    """

    min_args = max_args = 1

    arguments = '<site url>'

    options = (

        ('cookie',

         {'short': 'C', 'type' : 'string', 'metavar': 'key=value',

          'default': None,

          'help': 'session/authentication cookie.'}),

        ('user',

         {'short': 'u', 'type' : 'string', 'metavar': 'login',

          'default': None,

          'help': 'user login instead of giving raw cookie string (require lax '

          'based authentication).'}),

        ('password',

         {'short': 'p', 'type' : 'string', 'metavar': 'password',

          'default': None,

          'help': 'user password instead of giving raw cookie string (require '

          'lax based authentication).'}),

        )

    def _run(self, args):

        baseurl = args[0]

        if not baseurl.startswith('http'):

            baseurl = 'http://' + baseurl

        if not baseurl.endswith('/'):

            baseurl += '/'

        self.base_url = baseurl

        if not self.config.cookie and self.config.user:

            # no cookie specified but a user is. Try to open a session using

            # given authentication info

            print 'opening session for', self.config.user

            opener = urllib2.build_opener(GetSessionIdHandler(self.config))

            urllib2.install_opener(opener)

            data = urlencode(dict(__login=self.config.user,

                                  __password=self.config.password))

            self.open_url(urllib2.Request(baseurl, data))

        opener = urllib2.build_opener(NoRedirectHandler())

        urllib2.install_opener(opener)

        self.do_base_url(baseurl)

    def build_req(self, url):

        req = urllib2.Request(url)

        if self.config.cookie:

            req.headers['Cookie'] = self.config.cookie

        return req

    def open_url(self, req):

        try:

            return urllib2.urlopen(req)

        except urllib2.HTTPError, ex:

            if ex.code == 302:

                self.error_302(req, ex)

            elif ex.code == 500:

                self.error_500(req, ex)

            else:

                raise

    def error_302(self, req, ex):

        print 'authentication required'

        print ('visit %s?vid=authinfo with your browser to get '

               'authentication info' % self.base_url)

        sys.exit(1)

    def error_500(self, req, ex):

        print 'an unexpected error occured on the server'

        print ('you may get more information by visiting '

               '%s' % req.get_full_url())

        sys.exit(1)

    def extract_message(self, data):

        match = re.search(r'<div class="message">(.*?)</div>', data.read(), re.M|re.S)

        if match:

            msg = remove_html_tags(match.group(1))

            print msg

            return msg

    def do_base_url(self, baseurl):

        raise NotImplementedError()

class DSInitCommand(URLCommand):

    """initialize the datastore"""

    name = 'db-init'

    options = URLCommand.options + (

        ('sleep',

         {'short': 's', 'type' : 'int', 'metavar': 'nb seconds',

          'default': None,

          'help': 'number of seconds to wait between each request to avoid '

          'going out of quota.'}),

        )

    def do_base_url(self, baseurl):

        req = self.build_req(baseurl + '?vid=contentinit')

        while True:

            try:

                data = self.open_url(req)

            except urllib2.HTTPError, ex:

                if ex.code == 303: # redirect

                    print 'process completed'

                    break

                raise

            msg = self.extract_message(data)

            if msg and msg.startswith('error: '):

                print ('you may to cleanup datastore by visiting '

                       '%s?vid=contentclear (ALL ENTITIES WILL BE DELETED)'

                       % baseurl)

                break

            if self.config.sleep:

                time.sleep(self.config.sleep)

class CleanSessionsCommand(URLCommand):

    """cleanup sessions on the server. This command should usually be called

    regularly by a cron job or equivalent.

    """

    name = "cleansessions"

    def do_base_url(self, baseurl):

        req = self.build_req(baseurl + '?vid=cleansessions')

        data = self.open_url(req)

        self.extract_message(data)

register_commands([GenerateSchemaCommand,

                   PopulateDataDirCommand,

                   DSInitCommand,

                   CleanSessionsCommand,

                   ])

def run():

    main_run(sys.argv[1:])

if __name__ == '__main__':

    run()