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# -*- coding: utf-8 -*-

"""
Users of the API might have to deal with failed requests.
This middleware catches errors raised by urllib2’s urlopen,
and sends an HTTP error with the same return code to the
client, so that she or he knows what’s going on.
"""

from urllib2 import HTTPError
from django.http import Http404

class APIError(object):
    def process_exception(self, request, exception):
        if isinstance(exception, HTTPError):
            if exception.code == 404:
                raise Http404
            else:
                return HttpResponse(status=exception.code)
        else:
            return None
          

# http://gun.io/blog/fast-as-fuck-django-part-1-using-a-profiler/
# Orignal version taken from http://www.djangosnippets.org/snippets/186/
# Original author: udfalkso
# Modified by: Shwagroo Team and Gun.io

import sys
import os
import re
import hotshot, hotshot.stats
import tempfile
import StringIO

from django.conf import settings

words_re = re.compile( r'\s+' )

group_prefix_re = [
    re.compile( "^.*/django/[^/]+" ),
    re.compile( "^(.*)/[^/]+$" ), # extract module path
    re.compile( ".*" ),           # catch strange entries
]


class ProfileMiddleware(object):
    """
    Displays hotshot profiling for any view.
    http://yoursite.com/yourview/?prof

    Add the "prof" key to query string by appending ?prof (or &prof=)
    and you'll see the profiling results in your browser.
    It's set up to only be available in django's debug mode, is available for superuser otherwise,
    but you really shouldn't add this middleware to any production configuration.

    WARNING: It uses hotshot profiler which is not thread safe.
    """
    def process_request(self, request):
        if (settings.DEBUG or request.user.is_superuser) and 'prof' in request.GET: 
            self.tmpfile = tempfile.mktemp()
            self.prof = hotshot.Profile(self.tmpfile)

    def process_view(self, request, callback, callback_args, callback_kwargs):
        if (settings.DEBUG or request.user.is_superuser) and 'prof' in request.GET:
            return self.prof.runcall(callback, request, *callback_args, **callback_kwargs)

    def get_group(self, file):
        for g in group_prefix_re:
            name = g.findall( file )
            if name:
                return name[0]

    def get_summary(self, results_dict, sum):
        list = [ (item[1], item[0]) for item in results_dict.items() ]
        list.sort( reverse = True )
        list = list[:40]

        res = "      tottime\n"
        for item in list:
            res += "%4.1f%% %7.3f %s\n" % ( 100*item[0]/sum if sum else 0, item[0], item[1] )

        return res

    def summary_for_files(self, stats_str):
        stats_str = stats_str.split("\n")[5:]

        mystats = {}
        mygroups = {}

        sum = 0

        for s in stats_str:
            fields = words_re.split(s);
            if len(fields) == 7:
                time = float(fields[2])
                sum += time
                file = fields[6].split(":")[0]

                if not file in mystats:
                    mystats[file] = 0
                mystats[file] += time

                group = self.get_group(file)
                if not group in mygroups:
                    mygroups[ group ] = 0
                mygroups[ group ] += time

        return "<pre>" + \
               " ---- By file ----\n\n" + self.get_summary(mystats,sum) + "\n" + \
               " ---- By group ---\n\n" + self.get_summary(mygroups,sum) + \
               "</pre>"

    def process_response(self, request, response):
        if (settings.DEBUG or request.user.is_superuser) and 'prof' in request.GET:
            self.prof.close()

            out = StringIO.StringIO()
            old_stdout = sys.stdout
            sys.stdout = out

            stats = hotshot.stats.load(self.tmpfile)
            stats.sort_stats('time', 'calls')
            stats.print_stats()

            sys.stdout = old_stdout
            stats_str = out.getvalue()

            if response and response.content and stats_str:
                response.content = "<pre>" + stats_str + "</pre>"

            response.content = "\n".join(response.content.split("\n")[:40])

            response.content += self.summary_for_files(stats_str)

            os.unlink(self.tmpfile)

        return response