from django import forms
from django.contrib import admin
from django.contrib.auth import get_user_model
from django.urls import reverse
from django.utils.html import format_html
from django.utils.translation import gettext_lazy as _

# Register your models here.
from .models import Article, Category, Tag, Links, SideBar, BlogSettings


class ArticleForm(forms.ModelForm):
    # body = forms.CharField(widget=AdminPagedownWidget())

    class Meta:
        # mk: 指定表单关联的模型和字段
        model = Article
        fields = '__all__'


def makr_article_publish(modeladmin, request, queryset):
    # mk: 批量发布文章操作，将选中的文章状态更新为已发布('p')
    queryset.update(status='p')


def draft_article(modeladmin, request, queryset):
    # mk: 批量将文章设为草稿状态，将选中的文章状态更新为草稿('d')
    queryset.update(status='d')


def close_article_commentstatus(modeladmin, request, queryset):
    # mk: 批量关闭文章评论功能，将选中的文章评论状态更新为关闭('c')
    queryset.update(comment_status='c')


def open_article_commentstatus(modeladmin, request, queryset):
    # mk: 批量开启文章评论功能，将选中的文章评论状态更新为开启('o')
    queryset.update(comment_status='o')


# mk: 为自定义管理操作设置显示名称
makr_article_publish.short_description = _('Publish selected articles')
draft_article.short_description = _('Draft selected articles')
close_article_commentstatus.short_description = _('Close article comments')
open_article_commentstatus.short_description = _('Open article comments')


class ArticlelAdmin(admin.ModelAdmin):
    # mk: 设置文章管理界面每页显示20条记录
    list_per_page = 20
    # mk: 设置搜索字段，支持在文章正文和标题中搜索
    search_fields = ('body', 'title')
    # mk: 指定使用的表单类
    form = ArticleForm
    # mk: 设置在管理界面列表中显示的字段
    list_display = (
        'id',
        'title',
        'author',
        'link_to_category',
        'creation_time',
        'views',
        'status',
        'type',
        'article_order')
    # mk: 设置可以作为链接点击的字段
    list_display_links = ('id', 'title')
    # mk: 设置过滤器，可以在右侧边栏按状态、类型、分类筛选
    list_filter = ('status', 'type', 'category')
    # mk: 设置日期层级结构，用于按日期筛选文章
    date_hierarchy = 'creation_time'
    # mk: 设置多对多字段的横向筛选器
    filter_horizontal = ('tags',)
    # mk: 排除某些字段在表单中显示
    exclude = ('creation_time', 'last_modify_time')
    # mk: 启用"在站点上查看"功能
    view_on_site = True
    # mk: 注册自定义的批量操作
    actions = [
        makr_article_publish,
        draft_article,
        close_article_commentstatus,
        open_article_commentstatus]
    # mk: 设置使用原始ID字段的外键字段，提升性能
    raw_id_fields = ('author', 'category',)

    def link_to_category(self, obj):
        # mk: 创建指向分类编辑页面的链接
        info = (obj.category._meta.app_label, obj.category._meta.model_name)
        link = reverse('admin:%s_%s_change' % info, args=(obj.category.id,))
        return format_html(u'<a href="%s">%s</a>' % (link, obj.category.name))

    # mk: 设置分类链接字段的显示名称
    link_to_category.short_description = _('category')

    def get_form(self, request, obj=None, **kwargs):
        # mk: 自定义表单，限制作者字段只能选择超级用户
        form = super(ArticlelAdmin, self).get_form(request, obj, **kwargs)
        form.base_fields['author'].queryset = get_user_model(
        ).objects.filter(is_superuser=True)
        return form

    def save_model(self, request, obj, form, change):
        # mk: 保存模型实例，调用父类的保存方法
        super(ArticlelAdmin, self).save_model(request, obj, form, change)

    def get_view_on_site_url(self, obj=None):
        # mk: 返回在站点上查看文章的URL
        if obj:
            url = obj.get_full_url()
            return url
        else:
            from djangoblog.utils import get_current_site
            site = get_current_site().domain
            return site


class TagAdmin(admin.ModelAdmin):
    # mk: 标签管理界面排除某些字段
    exclude = ('slug', 'last_mod_time', 'creation_time')


class CategoryAdmin(admin.ModelAdmin):
    # mk: 设置分类管理界面显示的字段
    list_display = ('name', 'parent_category', 'index')
    # mk: 分类管理界面排除某些字段
    exclude = ('slug', 'last_mod_time', 'creation_time')


class LinksAdmin(admin.ModelAdmin):
    # mk: 链接管理界面排除某些字段
    exclude = ('last_mod_time', 'creation_time')


class SideBarAdmin(admin.ModelAdmin):
    # mk: 设置侧边栏管理界面显示的字段
    list_display = ('name', 'content', 'is_enable', 'sequence')
    # mk: 侧边栏管理界面排除某些字段
    exclude = ('last_mod_time', 'creation_time')


class BlogSettingsAdmin(admin.ModelAdmin):
    # mk: 博客设置管理界面使用默认配置
    pass