# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4
from __future__ import division
import os.path
from os.path import join
import re
from datetime import datetime
from urllib2 import unquote
import mimetypes

from django import forms
from django.core.paginator import Paginator
from django.contrib.auth.decorators import login_required
from django.contrib.auth.models import User
from django.db.models import Q, Avg, Count, Sum
from django.http import HttpResponse, Http404
from django.shortcuts import render_to_response, get_object_or_404, get_list_or_404, redirect
from django.template import RequestContext
from django.conf import settings

from ox.utils import json
from ox.django.decorators import login_required_json
from ox.django.shortcuts import render_to_json_response, get_object_or_404_json, json_response
from ox.django.http import HttpFileResponse
import ox


def api(request):
    if request.META['REQUEST_METHOD'] == "OPTIONS":
        response = HttpResponse('')
        response = render_to_json_response({'status': {'code': 200, 'text': 'use POST'}})
        response['Access-Control-Allow-Origin'] = '*'
        return response
    if not 'action' in request.POST:
        return apidoc(request)
    function = request.POST['action']
    #FIXME: possible to do this in f
    #data = json.loads(request.POST['data'])

    f = globals().get('api_'+function, None)
    if f:
        response = f(request)
    else:
        response = render_to_json_response(json_response(status=400,
                                text='Unknown function %s' % function))
    response['Access-Control-Allow-Origin'] = '*'
    return response

def api_api(request):
    '''
        returns list of all known api action
        return {'status': {'code': int, 'text': string},
                'data': {actions: ['api', 'hello', ...]}}
    '''
    actions = globals().keys()
    actions = map(lambda a: a[4:], filter(lambda a: a.startswith('api_'), actions))
    actions.sort()
    ret = {}
    #FIXME: set cache to False for login, logout, etc.
    for a in actions:
        ret[a] = {
            'cache': True
        }
    return render_to_json_response(json_response({'actions': ret}))

def api_apidoc(request):
    '''
        returns array of actions with documentation
    '''
    actions = globals().keys()
    actions = map(lambda a: a[4:], filter(lambda a: a.startswith('api_'), actions))
    actions.sort()
    docs = {}
    for f in actions:
        docs[f] = get_api_doc(f)
    return render_to_json_response(json_response({'actions': docs}))


#FIXME: REMOVE THIS FUNCTION WHEN THERE ARE REAL USERS!!!!
def get_user_json(u):
    return {'name': 'Guest', 'group': 'guest', 'preferences': {}}

def api_hello(request):
    '''
        return {'status': {'code': int, 'text': string},
                'data': {user: object}}
    '''
    #data = json.loads(request.POST['data'])
    response = json_response({})
    if request.user.is_authenticated():
        response['data']['user'] = get_user_json(request.user)
    else:
        response['data']['user'] = {'name': 'Guest', 'group': 'guest', 'preferences': {}}
    return render_to_json_response(response)

def api_error(request):
    '''
        trows 503 error
    '''
    success = error_is_success
    return render_to_json_response({})


def api_find(request):
    data = json.loads(request.POST['data'])
#    print json.dumps(data)   
    model = getModel(data)
    response = json_response({})
    l = model.get_list(data)
    if data.has_key('ids'):
        ids = data['ids']
    else:
        ids = []
    if data.has_key('range'):
        response['data']['items'] = l
    else:
        response['data']['items'] = len(l)
        response['data']['positions'] = _get_positions(ids, l)
    response['status'] = {'code': 200}
    return render_to_json_response(response)

def _get_positions(ids, l):
    ret = {}
    i = 0
    for id in ids:
        for obj in l:
            if obj['id'] == id:
                ret[id] = i
                break
        i += 1
    return ret   


def api_preview(request):
    data = json.loads(request.POST['data'])
    if not data.has_key('id'):
        return render_to_json_response({'status': {'code': 404}})
    id = int(data['id'])
    model = getModel(data)
    response = json_response({})
    response['status'] = {'code': 200}
    obj = get_object_or_404(model, pk=id)
    response['data'] = obj.preview_dict()  
    response['template'] = getTemplate(data, "preview")
    return render_to_json_response(response)

#FIXME: Generalize based on these two functions being the same.
def api_info(request):
    data = json.loads(request.POST['data'])
    id = int(data['id'])
    model = getModel(data)
    response = json_response({})
    response['status'] = {'code': 200}
    obj = get_object_or_404(model, pk=id)
    response['data'] = obj.info_dict()  
    response['template'] = getTemplate(data, "info")
    return render_to_json_response(response)    

def getTemplate(data, tmpl_name):
    path = join(settings.PROJECT_PATH, "templates", data['module'], data['model'], tmpl_name + ".html")
    return open(path).read().strip()

def getModel(data):
    module = __import__(data['module'])
    return module.models.__getattribute__(data['model'])

def get_api_doc(f):
    f = 'api_' + f

    import sys
    def trim(docstring):
        if not docstring:
            return ''
        # Convert tabs to spaces (following the normal Python rules)
        # and split into a list of lines:
        lines = docstring.expandtabs().splitlines()
        # Determine minimum indentation (first line doesn't count):
        indent = sys.maxint
        for line in lines[1:]:
            stripped = line.lstrip()
            if stripped:
                indent = min(indent, len(line) - len(stripped))
        # Remove indentation (first line is special):
        trimmed = [lines[0].strip()]
        if indent < sys.maxint:
            for line in lines[1:]:
                trimmed.append(line[indent:].rstrip())
        # Strip off trailing and leading blank lines:
        while trimmed and not trimmed[-1]:
            trimmed.pop()
        while trimmed and not trimmed[0]:
            trimmed.pop(0)
        # Return a single string:
        return '\n'.join(trimmed)

    return trim(globals()[f].__doc__)

def apidoc(request):
    '''
        this is used for online documentation at http://127.0.0.1:8000/api/
    '''

    functions = filter(lambda x: x.startswith('api_'), globals().keys())
    api = []
    for f in sorted(functions):
        api.append({
            'name': f[4:],
            'doc': get_api_doc(f[4:]).replace('\n', '<br>\n')
        })
    context = RequestContext(request, {'api': api,
                                       'sitename': settings.SITENAME,})
    return render_to_response('api.html', context)

def jsdoc(request):
    '''
        Used to document OxUI JS Widgets
    '''
    context = RequestContext(request, {})
    return render_to_response("jsdoc.html", context)


'''
    ajax html snapshots
    http://code.google.com/web/ajaxcrawling/docs/html-snapshot.html    
'''
def html_snapshot(request):
    fragment = unquote(request.GET['_escaped_fragment_'])
    url = request.build_absolute_uri('/ra')
    url = 'http://'+settings.URL
    response = HttpResponse('sorry, server side rendering for %s!#%s not yet implemented'%(url, fragment))
    return response