"""Tornado handlers for the live notebook view.

Authors:

* Brian Granger
"""

#-----------------------------------------------------------------------------
#  Copyright (C) 2011  The IPython Development Team
#
#  Distributed under the terms of the BSD License.  The full license is in
#  the file COPYING, distributed as part of this software.
#-----------------------------------------------------------------------------

#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------

import os
from tornado import web
HTTPError = web.HTTPError
from zmq.utils import jsonapi


from ..base.handlers import IPythonHandler
from ..services.notebooks.handlers import _notebook_path_regex, _path_regex
from ..utils import url_path_join
from urllib import quote

#-----------------------------------------------------------------------------
# Handlers
#-----------------------------------------------------------------------------


class NotebookHandler(IPythonHandler):

    @web.authenticated
    def post(self):
        """post either creates a new notebook if no json data is
        sent to the server, or copies the data and returns a 
        copied notebook."""
        nbm = self.notebook_manager
        data=self.request.body
        if data:
            data = jsonapi.loads(data)
            notebook_name = nbm.copy_notebook(data['name'])
        else:
            notebook_name = nbm.new_notebook()
        self.finish(jsonapi.dumps({"name": notebook_name}))


class NamedNotebookHandler(IPythonHandler):

    @web.authenticated
    def get(self, path='', name=None):
        """get renders the notebook template if a name is given, or 
        redirects to the '/files/' handler if the name is not given."""
        nbm = self.notebook_manager
        if name is None:
            url = url_path_join(self.base_project_url, 'files', path)
            self.redirect(url)
            return
            
        # a .ipynb filename was given
        if not nbm.notebook_exists(name, path):
            raise web.HTTPError(404, u'Notebook does not exist: %s/%s' % (path, name))
        name = nbm.url_encode(name)
        path = nbm.url_encode(path)
        self.write(self.render_template('notebook.html',
            project=self.project_dir,
            notebook_path=path,
            notebook_name=name,
            kill_kernel=False,
            mathjax_url=self.mathjax_url,
            )
        )

    @web.authenticated
    def post(self, path='', name=None):
        """post either creates a new notebook if no json data is
        sent to the server, or copies the data and returns a 
        copied notebook in the location given by 'notebook_path."""
        nbm = self.notebook_manager
        data = self.request.body
        if data:
            data = jsonapi.loads(data)
            notebook_name = nbm.copy_notebook(data['name'], notebook_path)
        else:
            notebook_name = nbm.new_notebook(notebook_path)
        self.finish(jsonapi.dumps({"name": notebook_name}))


#-----------------------------------------------------------------------------
# URL to handler mappings
#-----------------------------------------------------------------------------


default_handlers = [
    (r"/notebooks/?%s" % _notebook_path_regex, NamedNotebookHandler),
    (r"/notebooks/?%s" % _path_regex, NamedNotebookHandler),
    (r"/notebooks/?", NotebookHandler),
]