from django.conf import settings

from django.contrib.admin.views.main import ALL_VAR, EMPTY_CHANGELIST_VALUE

from django.contrib.admin.views.main import ORDER_VAR, ORDER_TYPE_VAR, PAGE_VAR, SEARCH_VAR

from django.core.exceptions import ObjectDoesNotExist

from django.db import models

from django.utils import dateformat

from django.utils.html import escape, conditional_escape

from django.utils.text import capfirst

from django.utils.safestring import mark_safe

from django.utils.translation import get_date_formats, get_partial_date_formats, ugettext as _

from django.utils.encoding import smart_unicode, smart_str, force_unicode

from django.template import Library

import datetime

register = Library()

DOT = '.'

def paginator_number(cl,i):

    if i == DOT:

        return u'... '

    elif i == cl.page_num:

        return mark_safe(u'<span class="this-page">%d</span> ' % (i+1))

    else:

        return mark_safe(u'<a href="%s"%s>%d</a> ' % (cl.get_query_string({PAGE_VAR: i}), (i == cl.paginator.num_pages-1 and ' class="end"' or ''), i+1))

paginator_number = register.simple_tag(paginator_number)

def pagination(cl):

    paginator, page_num = cl.paginator, cl.page_num

    pagination_required = (not cl.show_all or not cl.can_show_all) and cl.multi_page

    if not pagination_required:

        page_range = []

    else:

        ON_EACH_SIDE = 3

        ON_ENDS = 2

        # If there are 10 or fewer pages, display links to every page.

        # Otherwise, do some fancy

        if paginator.num_pages <= 10:

            page_range = range(paginator.num_pages)

        else:

            # Insert "smart" pagination links, so that there are always ON_ENDS

            # links at either end of the list of pages, and there are always

            # ON_EACH_SIDE links at either end of the "current page" link.

            page_range = []

            if page_num > (ON_EACH_SIDE + ON_ENDS):

                page_range.extend(range(0, ON_EACH_SIDE - 1))

                page_range.append(DOT)

                page_range.extend(range(page_num - ON_EACH_SIDE, page_num + 1))

            else:

                page_range.extend(range(0, page_num + 1))

            if page_num < (paginator.num_pages - ON_EACH_SIDE - ON_ENDS - 1):

                page_range.extend(range(page_num + 1, page_num + ON_EACH_SIDE + 1))

                page_range.append(DOT)

                page_range.extend(range(paginator.num_pages - ON_ENDS, paginator.num_pages))

            else:

                page_range.extend(range(page_num + 1, paginator.num_pages))

    need_show_all_link = cl.can_show_all and not cl.show_all and cl.multi_page

    return {

        'cl': cl,

        'pagination_required': pagination_required,

        'show_all_url': need_show_all_link and cl.get_query_string({ALL_VAR: ''}),

        'page_range': page_range,

        'ALL_VAR': ALL_VAR,

        '1': 1,

    }

pagination = register.inclusion_tag('admin/pagination.html')(pagination)

def result_headers(cl):

    lookup_opts = cl.lookup_opts

    for i, field_name in enumerate(lookup_opts.admin.list_display):

        try:

            f = lookup_opts.get_field(field_name)

            admin_order_field = None

        except models.FieldDoesNotExist:

            # For non-field list_display values, check for the function

            # attribute "short_description". If that doesn't exist, fall back

            # to the method name. And __str__ and __unicode__ are special-cases.

            if field_name == '__unicode__':

                header = force_unicode(lookup_opts.verbose_name)

            elif field_name == '__str__':

                header = smart_str(lookup_opts.verbose_name)

            else:

                attr = getattr(cl.model, field_name) # Let AttributeErrors propagate.

                try:

                    header = attr.short_description

                except AttributeError:

                    header = field_name.replace('_', ' ')

            # It is a non-field, but perhaps one that is sortable

            admin_order_field = getattr(getattr(cl.model, field_name), "admin_order_field", None)

            if not admin_order_field:

                yield {"text": header}

                continue

            # So this _is_ a sortable non-field.  Go to the yield

            # after the else clause.

        else:

            if isinstance(f.rel, models.ManyToOneRel) and f.null:

                yield {"text": f.verbose_name}

                continue

            else:

                header = f.verbose_name

        th_classes = []

        new_order_type = 'asc'

        if field_name == cl.order_field or admin_order_field == cl.order_field:

            th_classes.append('sorted %sending' % cl.order_type.lower())

            new_order_type = {'asc': 'desc', 'desc': 'asc'}[cl.order_type.lower()]

        yield {"text": header,

               "sortable": True,

               "url": cl.get_query_string({ORDER_VAR: i, ORDER_TYPE_VAR: new_order_type}),

               "class_attrib": mark_safe(th_classes and ' class="%s"' % ' '.join(th_classes) or '')}

def _boolean_icon(field_val):

    BOOLEAN_MAPPING = {True: 'yes', False: 'no', None: 'unknown'}

    return mark_safe(u'<img src="%simg/admin/icon-%s.gif" alt="%s" />' % (settings.ADMIN_MEDIA_PREFIX, BOOLEAN_MAPPING[field_val], field_val))

def items_for_result(cl, result):

    first = True

    pk = cl.lookup_opts.pk.attname

    for field_name in cl.lookup_opts.admin.list_display:

        row_class = ''

        try:

            f = cl.lookup_opts.get_field(field_name)

        except models.FieldDoesNotExist:

            # For non-field list_display values, the value is either a method

            # or a property.

            try:

                attr = getattr(result, field_name)

                allow_tags = getattr(attr, 'allow_tags', False)

                boolean = getattr(attr, 'boolean', False)

                if callable(attr):

                    attr = attr()

                if boolean:

                    allow_tags = True

                    result_repr = _boolean_icon(attr)

                else:

                    result_repr = smart_unicode(attr)

            except (AttributeError, ObjectDoesNotExist):

                result_repr = EMPTY_CHANGELIST_VALUE

            else:

                # Strip HTML tags in the resulting text, except if the

                # function has an "allow_tags" attribute set to True.

                if not allow_tags:

                    result_repr = escape(result_repr)

                else:

                    result_repr = mark_safe(result_repr)

        else:

            field_val = getattr(result, f.attname)

            if isinstance(f.rel, models.ManyToOneRel):

                if field_val is not None:

                    result_repr = escape(getattr(result, f.name))

                else:

                    result_repr = EMPTY_CHANGELIST_VALUE

            # Dates and times are special: They're formatted in a certain way.

            elif isinstance(f, models.DateField) or isinstance(f, models.TimeField):

                if field_val:

                    (date_format, datetime_format, time_format) = get_date_formats()

                    if isinstance(f, models.DateTimeField):

                        result_repr = capfirst(dateformat.format(field_val, datetime_format))

                    elif isinstance(f, models.TimeField):

                        result_repr = capfirst(dateformat.time_format(field_val, time_format))

                    else:

                        result_repr = capfirst(dateformat.format(field_val, date_format))

                else:

                    result_repr = EMPTY_CHANGELIST_VALUE

                row_class = ' class="nowrap"'

            # Booleans are special: We use images.

            elif isinstance(f, models.BooleanField) or isinstance(f, models.NullBooleanField):

                result_repr = _boolean_icon(field_val)

            # DecimalFields are special: Zero-pad the decimals.

            elif isinstance(f, models.DecimalField):

                if field_val is not None:

                    result_repr = ('%%.%sf' % f.decimal_places) % field_val

                else:

                    result_repr = EMPTY_CHANGELIST_VALUE

            # Fields with choices are special: Use the representation

            # of the choice.

            elif f.choices:

                result_repr = dict(f.choices).get(field_val, EMPTY_CHANGELIST_VALUE)

            else:

                result_repr = escape(field_val)

        if force_unicode(result_repr) == '':

            result_repr = mark_safe(' ')

        # If list_display_links not defined, add the link tag to the first field

        if (first and not cl.lookup_opts.admin.list_display_links) or field_name in cl.lookup_opts.admin.list_display_links:

            table_tag = {True:'th', False:'td'}[first]

            first = False

            url = cl.url_for_result(result)

            # Convert the pk to something that can be used in Javascript.

            # Problem cases are long ints (23L) and non-ASCII strings.

            result_id = repr(force_unicode(getattr(result, pk)))[1:]

            yield mark_safe(u'<%s%s><a href="%s"%s>%s</a></%s>' % \

                (table_tag, row_class, url, (cl.is_popup and ' onclick="opener.dismissRelatedLookupPopup(window, %s); return false;"' % result_id or ''), conditional_escape(result_repr), table_tag))

        else:

            yield mark_safe(u'<td%s>%s</td>' % (row_class, conditional_escape(result_repr)))

def results(cl):

    for res in cl.result_list:

        yield list(items_for_result(cl,res))

def result_list(cl):

    return {'cl': cl,

            'result_headers': list(result_headers(cl)),

            'results': list(results(cl))}

result_list = register.inclusion_tag("admin/change_list_results.html")(result_list)

def date_hierarchy(cl):

    if cl.lookup_opts.admin.date_hierarchy:

        field_name = cl.lookup_opts.admin.date_hierarchy

        year_field = '%s__year' % field_name

        month_field = '%s__month' % field_name

        day_field = '%s__day' % field_name

        field_generic = '%s__' % field_name

        year_lookup = cl.params.get(year_field)

        month_lookup = cl.params.get(month_field)

        day_lookup = cl.params.get(day_field)

        year_month_format, month_day_format = get_partial_date_formats()

        link = lambda d: mark_safe(cl.get_query_string(d, [field_generic]))

        if year_lookup and month_lookup and day_lookup:

            day = datetime.date(int(year_lookup), int(month_lookup), int(day_lookup))

            return {

                'show': True,

                'back': {

                    'link': link({year_field: year_lookup, month_field: month_lookup}),

                    'title': dateformat.format(day, year_month_format)

                },

                'choices': [{'title': dateformat.format(day, month_day_format)}]

            }

        elif year_lookup and month_lookup:

            days = cl.query_set.filter(**{year_field: year_lookup, month_field: month_lookup}).dates(field_name, 'day')

            return {

                'show': True,

                'back': {

                    'link': link({year_field: year_lookup}),

                    'title': year_lookup

                },

                'choices': [{

                    'link': link({year_field: year_lookup, month_field: month_lookup, day_field: day.day}),

                    'title': dateformat.format(day, month_day_format)

                } for day in days]

            }

        elif year_lookup:

            months = cl.query_set.filter(**{year_field: year_lookup}).dates(field_name, 'month')

            return {

                'show' : True,

                'back': {

                    'link' : link({}),

                    'title': _('All dates')

                },

                'choices': [{

                    'link': link({year_field: year_lookup, month_field: month.month}),

                    'title': dateformat.format(month, year_month_format)

                } for month in months]

            }

        else:

            years = cl.query_set.dates(field_name, 'year')

            return {

                'show': True,

                'choices': [{

                    'link': link({year_field: year.year}),

                    'title': year.year

                } for year in years]

            }

date_hierarchy = register.inclusion_tag('admin/date_hierarchy.html')(date_hierarchy)

def search_form(cl):

    return {

        'cl': cl,

        'show_result_count': cl.result_count != cl.full_result_count and not cl.opts.one_to_one_field,

        'search_var': SEARCH_VAR

    }

search_form = register.inclusion_tag('admin/search_form.html')(search_form)

def filter(cl, spec):

    return {'title': spec.title(), 'choices' : list(spec.choices(cl))}

filter = register.inclusion_tag('admin/filter.html')(filter)

def filters(cl):

    return {'cl': cl}

filters = register.inclusion_tag('admin/filters.html')(filters)