"""
${project}: a view with webob
"""

from genshi.template import TemplateLoader
from paste.fileapp import FileApp
from pkg_resources import resource_filename
from webob import Request, Response, exc

class ${project.title()}View(object):

    ### class level variables
    defaults = { 'auto_reload': 'False'}

    def __init__(self, **kw):

        # set instance parameters from kw and defaults
        for key in self.defaults:
            setattr(self, key, kw.get(key, self.defaults[key]))
        self.auto_reload = self.auto_reload.lower() == 'true'

        # methods to respond to
        self.response_functions = { 'GET': self.get,
                                    'POST': self.post,
                                    }

        # static files
        self.htdocs = resource_filename(__name__, 'static')

        # template loader
        templates_dir = resource_filename(__name__, 'templates')
        self.loader = TemplateLoader(templates_dir,
                                     auto_reload=self.auto_reload)

    ### methods dealing with HTTP
    def __call__(self, environ, start_response):
        request = Request(environ)
        filename = os.path.join(self.htdocs, request.path_info)
        if request.path_info != '/' and os.path.exists(filename):
            fileapp = FileApp(filename)
            return fileapp(environ, start_response)
        res = self.make_response(request)
        return res(environ, start_response)
                                
    def make_response(self, request):
        return self.response_functions.get(request.method, self.error)(request)

    def get_response(self, text, content_type='text/html'):
        """make an HTTP response from text"""
        res = Response(content_type=content_type, body=text)
        return res

    def get(self, request):
        """
        return response to a GET requst
        """

        # template data dictionary      
        data = { 'subject': request.GET.get('subject', 'world') } 

        # render the template
        template = self.loader.load('helloworld.html')
        res = template.generate(**data).render('html', doctype='html')
        # generate the response
        return self.get_response(res)

    def post(self, request):
        """
        return response to a POST request
        """
        return exc.HTTPOk("Ok")

    def error(self, request):
        """deal with non-supported methods"""
        return exc.HTTPMethodNotAllowed("Only %r operations are allowed" % self.response_functions.keys())