#gq:
from django.contrib import admin
from django.contrib.admin.models import DELETION
from django.contrib.contenttypes.models import ContentType
from django.urls import reverse, NoReverseMatch
from django.utils.encoding import force_str
from django.utils.html import escape
from django.utils.safestring import mark_safe
from django.utils.translation import gettext_lazy as _

class LogEntryAdmin(admin.ModelAdmin):
    """Admin操作日志自定义管理类：优化展示与权限控制"""
    list_filter = ['content_type']  # 按内容类型筛选
    search_fields = ['object_repr', 'change_message']  # 搜索对象描述、操作信息
    list_display_links = ['action_time', 'get_change_message']  # 可点击跳转字段
    list_display = ['action_time', 'user_link', 'content_type', 'object_link', 'get_change_message']  # 列表展示字段

    def has_add_permission(self, request):
        """禁用添加：日志自动生成，不允许手动添加"""
        return False

    def has_change_permission(self, request, obj=None):
        """仅超级用户/有权限用户可查看，禁止POST修改"""
        return (request.user.is_superuser or request.user.has_perm('admin.change_logentry')) and request.method != 'POST'

    def has_delete_permission(self, request, obj=None):
        """禁用删除：日志需保留"""
        return False

    def object_link(self, obj):
        """操作对象字段：非删除操作显示Admin编辑链接"""
        object_link = escape(obj.object_repr)
        if obj.action_flag != DELETION and obj.content_type:
            try:
                url = reverse(f'admin:{obj.content_type.app_label}_{obj.content_type.model}_change', args=[obj.object_id])
                object_link = f'<a href="{url}">{object_link}</a>'
            except NoReverseMatch:
                pass
        return mark_safe(object_link)

    object_link.admin_order_field = 'object_repr'
    object_link.short_description = _('object')

    def user_link(self, obj):
        """操作用户字段：显示用户Admin编辑链接"""
        content_type = ContentType.objects.get_for_model(type(obj.user))
        user_link = escape(force_str(obj.user))
        try:
            url = reverse(f'admin:{content_type.app_label}_{content_type.model}_change', args=[obj.user.pk])
            user_link = f'<a href="{url}">{user_link}</a>'
        except NoReverseMatch:
            pass
        return mark_safe(user_link)

    user_link.admin_order_field = 'user'
    user_link.short_description = _('user')

    def get_queryset(self, request):
        """预加载content_type，优化查询性能"""
        return super().get_queryset(request).prefetch_related('content_type')

    def get_actions(self, request):
        """移除批量删除操作"""
        actions = super().get_actions(request)
        del actions['delete_selected']
        return actions