from django import template, templatetags

from django.template import RequestContext

from django.conf import settings

from django.contrib.admin.views.decorators import staff_member_required

from django.db import models

from django.shortcuts import render_to_response

from django.core.exceptions import ImproperlyConfigured, ViewDoesNotExist

from django.http import Http404

from django.core import urlresolvers

from django.contrib.admindocs import utils

from django.contrib.sites.models import Site

from django.utils.importlib import import_module

from django.utils.translation import ugettext as _

from django.utils.safestring import mark_safe

import inspect, os, re

# Exclude methods starting with these strings from documentation

MODEL_METHODS_EXCLUDE = ('_', 'add_', 'delete', 'save', 'set_')

class GenericSite(object):

    domain = 'example.com'

    name = 'my site'

def get_root_path():

    try:

        return urlresolvers.reverse('admin:index')

    except urlresolvers.NoReverseMatch:

        from django.contrib import admin

        try:

            return urlresolvers.reverse(admin.site.root, args=[''])

        except urlresolvers.NoReverseMatch:

            return getattr(settings, "ADMIN_SITE_ROOT_URL", "/admin/")

def doc_index(request):

    if not utils.docutils_is_available:

        return missing_docutils_page(request)

    return render_to_response('admin_doc/index.html', {

        'root_path': get_root_path(),

    }, context_instance=RequestContext(request))

doc_index = staff_member_required(doc_index)

def bookmarklets(request):

    admin_root = get_root_path()

    return render_to_response('admin_doc/bookmarklets.html', {

        'root_path': admin_root,

        'admin_url': mark_safe("%s://%s%s" % (request.is_secure() and 'https' or 'http', request.get_host(), admin_root)),

    }, context_instance=RequestContext(request))

bookmarklets = staff_member_required(bookmarklets)

def template_tag_index(request):

    if not utils.docutils_is_available:

        return missing_docutils_page(request)

    load_all_installed_template_libraries()

    tags = []

    for module_name, library in template.libraries.items():

        for tag_name, tag_func in library.tags.items():

            title, body, metadata = utils.parse_docstring(tag_func.__doc__)

            if title:

                title = utils.parse_rst(title, 'tag', _('tag:') + tag_name)

            if body:

                body = utils.parse_rst(body, 'tag', _('tag:') + tag_name)

            for key in metadata:

                metadata[key] = utils.parse_rst(metadata[key], 'tag', _('tag:') + tag_name)

            if library in template.builtins:

                tag_library = None

            else:

                tag_library = module_name.split('.')[-1]

            tags.append({

                'name': tag_name,

                'title': title,

                'body': body,

                'meta': metadata,

                'library': tag_library,

            })

    return render_to_response('admin_doc/template_tag_index.html', {

        'root_path': get_root_path(),

        'tags': tags

    }, context_instance=RequestContext(request))

template_tag_index = staff_member_required(template_tag_index)

def template_filter_index(request):

    if not utils.docutils_is_available:

        return missing_docutils_page(request)

    load_all_installed_template_libraries()

    filters = []

    for module_name, library in template.libraries.items():

        for filter_name, filter_func in library.filters.items():

            title, body, metadata = utils.parse_docstring(filter_func.__doc__)

            if title:

                title = utils.parse_rst(title, 'filter', _('filter:') + filter_name)

            if body:

                body = utils.parse_rst(body, 'filter', _('filter:') + filter_name)

            for key in metadata:

                metadata[key] = utils.parse_rst(metadata[key], 'filter', _('filter:') + filter_name)

            if library in template.builtins:

                tag_library = None

            else:

                tag_library = module_name.split('.')[-1]

            filters.append({

                'name': filter_name,

                'title': title,

                'body': body,

                'meta': metadata,

                'library': tag_library,

            })

    return render_to_response('admin_doc/template_filter_index.html', {

        'root_path': get_root_path(),

        'filters': filters

    }, context_instance=RequestContext(request))

template_filter_index = staff_member_required(template_filter_index)

def view_index(request):

    if not utils.docutils_is_available:

        return missing_docutils_page(request)

    if settings.ADMIN_FOR:

        settings_modules = [import_module(m) for m in settings.ADMIN_FOR]

    else:

        settings_modules = [settings]

    views = []

    for settings_mod in settings_modules:

        urlconf = import_module(settings_mod.ROOT_URLCONF)

        view_functions = extract_views_from_urlpatterns(urlconf.urlpatterns)

        if Site._meta.installed:

            site_obj = Site.objects.get(pk=settings_mod.SITE_ID)

        else:

            site_obj = GenericSite()

        for (func, regex) in view_functions:

            views.append({

                'name': getattr(func, '__name__', func.__class__.__name__),

                'module': func.__module__,

                'site_id': settings_mod.SITE_ID,

                'site': site_obj,

                'url': simplify_regex(regex),

            })

    return render_to_response('admin_doc/view_index.html', {

        'root_path': get_root_path(),

        'views': views

    }, context_instance=RequestContext(request))

view_index = staff_member_required(view_index)

def view_detail(request, view):

    if not utils.docutils_is_available:

        return missing_docutils_page(request)

    mod, func = urlresolvers.get_mod_func(view)

    try:

        view_func = getattr(import_module(mod), func)

    except (ImportError, AttributeError):

        raise Http404

    title, body, metadata = utils.parse_docstring(view_func.__doc__)

    if title:

        title = utils.parse_rst(title, 'view', _('view:') + view)

    if body:

        body = utils.parse_rst(body, 'view', _('view:') + view)

    for key in metadata:

        metadata[key] = utils.parse_rst(metadata[key], 'model', _('view:') + view)

    return render_to_response('admin_doc/view_detail.html', {

        'root_path': get_root_path(),

        'name': view,

        'summary': title,

        'body': body,

        'meta': metadata,

    }, context_instance=RequestContext(request))

view_detail = staff_member_required(view_detail)

def model_index(request):

    if not utils.docutils_is_available:

        return missing_docutils_page(request)

    m_list = [m._meta for m in models.get_models()]

    return render_to_response('admin_doc/model_index.html', {

        'root_path': get_root_path(),

        'models': m_list

    }, context_instance=RequestContext(request))

model_index = staff_member_required(model_index)

def model_detail(request, app_label, model_name):

    if not utils.docutils_is_available:

        return missing_docutils_page(request)

    # Get the model class.

    try:

        app_mod = models.get_app(app_label)

    except ImproperlyConfigured:

        raise Http404(_("App %r not found") % app_label)

    model = None

    for m in models.get_models(app_mod):

        if m._meta.object_name.lower() == model_name:

            model = m

            break

    if model is None:

        raise Http404(_("Model %(model_name)r not found in app %(app_label)r") % {'model_name': model_name, 'app_label': app_label})

    opts = model._meta

    # Gather fields/field descriptions.

    fields = []

    for field in opts.fields:

        # ForeignKey is a special case since the field will actually be a

        # descriptor that returns the other object

        if isinstance(field, models.ForeignKey):

            data_type = related_object_name = field.rel.to.__name__

            app_label = field.rel.to._meta.app_label

            verbose = utils.parse_rst((_("the related `%(app_label)s.%(data_type)s` object")  % {'app_label': app_label, 'data_type': data_type}), 'model', _('model:') + data_type)

        else:

            data_type = get_readable_field_data_type(field)

            verbose = field.verbose_name

        fields.append({

            'name': field.name,

            'data_type': data_type,

            'verbose': verbose,

            'help_text': field.help_text,

        })

    # Gather many-to-many fields.

    for field in opts.many_to_many:

        data_type = related_object_name = field.rel.to.__name__

        app_label = field.rel.to._meta.app_label

        verbose = _("related `%(app_label)s.%(object_name)s` objects") % {'app_label': app_label, 'object_name': data_type}

        fields.append({

            'name': "%s.all" % field.name,

            "data_type": 'List',

            'verbose': utils.parse_rst(_("all %s") % verbose , 'model', _('model:') + opts.module_name),

        })

        fields.append({

            'name'      : "%s.count" % field.name,

            'data_type' : 'Integer',

            'verbose'   : utils.parse_rst(_("number of %s") % verbose , 'model', _('model:') + opts.module_name),

        })

    # Gather model methods.

    for func_name, func in model.__dict__.items():

        if (inspect.isfunction(func) and len(inspect.getargspec(func)[0]) == 1):

            try:

                for exclude in MODEL_METHODS_EXCLUDE:

                    if func_name.startswith(exclude):

                        raise StopIteration

            except StopIteration:

                continue

            verbose = func.__doc__

            if verbose:

                verbose = utils.parse_rst(utils.trim_docstring(verbose), 'model', _('model:') + opts.module_name)

            fields.append({

                'name': func_name,

                'data_type': get_return_data_type(func_name),

                'verbose': verbose,

            })

    # Gather related objects

    for rel in opts.get_all_related_objects() + opts.get_all_related_many_to_many_objects():

        verbose = _("related `%(app_label)s.%(object_name)s` objects") % {'app_label': rel.opts.app_label, 'object_name': rel.opts.object_name}

        accessor = rel.get_accessor_name()

        fields.append({

            'name'      : "%s.all" % accessor,

            'data_type' : 'List',

            'verbose'   : utils.parse_rst(_("all %s") % verbose , 'model', _('model:') + opts.module_name),

        })

        fields.append({

            'name'      : "%s.count" % accessor,

            'data_type' : 'Integer',

            'verbose'   : utils.parse_rst(_("number of %s") % verbose , 'model', _('model:') + opts.module_name),

        })

    return render_to_response('admin_doc/model_detail.html', {

        'root_path': get_root_path(),

        'name': '%s.%s' % (opts.app_label, opts.object_name),

        'summary': _("Fields on %s objects") % opts.object_name,

        'description': model.__doc__,

        'fields': fields,

    }, context_instance=RequestContext(request))

model_detail = staff_member_required(model_detail)

def template_detail(request, template):

    templates = []

    for site_settings_module in settings.ADMIN_FOR:

        settings_mod = import_module(site_settings_module)

        if Site._meta.installed:

            site_obj = Site.objects.get(pk=settings_mod.SITE_ID)

        else:

            site_obj = GenericSite()

        for dir in settings_mod.TEMPLATE_DIRS:

            template_file = os.path.join(dir, template)

            templates.append({

                'file': template_file,

                'exists': os.path.exists(template_file),

                'contents': lambda: os.path.exists(template_file) and open(template_file).read() or '',

                'site_id': settings_mod.SITE_ID,

                'site': site_obj,

                'order': list(settings_mod.TEMPLATE_DIRS).index(dir),

            })

    return render_to_response('admin_doc/template_detail.html', {

        'root_path': get_root_path(),

        'name': template,

        'templates': templates,

    }, context_instance=RequestContext(request))

template_detail = staff_member_required(template_detail)

####################

# Helper functions #

####################

def missing_docutils_page(request):

    """Display an error message for people without docutils"""

    return render_to_response('admin_doc/missing_docutils.html')

def load_all_installed_template_libraries():

    # Load/register all template tag libraries from installed apps.

    for module_name in template.get_templatetags_modules():

        mod = import_module(module_name)

        libraries = [

            os.path.splitext(p)[0]

            for p in os.listdir(os.path.dirname(mod.__file__))

            if p.endswith('.py') and p[0].isalpha()

        ]

        for library_name in libraries:

            try:

                lib = template.get_library(library_name)

            except template.InvalidTemplateLibrary, e:

                pass

def get_return_data_type(func_name):

    """Return a somewhat-helpful data type given a function name"""

    if func_name.startswith('get_'):

        if func_name.endswith('_list'):

            return 'List'

        elif func_name.endswith('_count'):

            return 'Integer'

    return ''

def get_readable_field_data_type(field):

    """Returns the description for a given field type, if it exists,

    Fields' descriptions can contain format strings, which will be interpolated

    against the values of field.__dict__ before being output."""

    return field.description % field.__dict__

def extract_views_from_urlpatterns(urlpatterns, base=''):

    """

    Return a list of views from a list of urlpatterns.

    Each object in the returned list is a two-tuple: (view_func, regex)

    """

    views = []

    for p in urlpatterns:

        if hasattr(p, '_get_callback'):

            try:

                views.append((p._get_callback(), base + p.regex.pattern))

            except ViewDoesNotExist:

                continue

        elif hasattr(p, '_get_url_patterns'):

            try:

                patterns = p.url_patterns

            except ImportError:

                continue

            views.extend(extract_views_from_urlpatterns(patterns, base + p.regex.pattern))

        else:

            raise TypeError(_("%s does not appear to be a urlpattern object") % p)

    return views

named_group_matcher = re.compile(r'\(\?P(<\w+>).+?\)')

non_named_group_matcher = re.compile(r'\(.*?\)')

def simplify_regex(pattern):

    """

    Clean up urlpattern regexes into something somewhat readable by Mere Humans:

    turns something like "^(?P<sport_slug>\w+)/athletes/(?P<athlete_slug>\w+)/$"

    into "<sport_slug>/athletes/<athlete_slug>/"

    """

    # handle named groups first

    pattern = named_group_matcher.sub(lambda m: m.group(1), pattern)

    # handle non-named groups

    pattern = non_named_group_matcher.sub("<var>", pattern)

    # clean up any outstanding regex-y characters.

    pattern = pattern.replace('^', '').replace('$', '').replace('?', '').replace('//', '/').replace('\\', '')

    if not pattern.startswith('/'):