"""
Django Admin扩展
提供增强的管理界面功能
"""

import logging
from datetime import datetime, timedelta
from django.contrib import admin
from django.contrib.admin import SimpleListFilter
from django.contrib.admin.utils import model_format_dict
from django.contrib import messages
from django.http import HttpResponseRedirect
from django.urls import path, reverse
from django.utils.html import format_html
from django.utils import timezone
from django.db.models import Count, Q
from django.core.cache import cache

from .models import Website, Article
from .tasks import crawl_website, crawl_all_websites, cleanup_old_articles
from .distributed_crawler import distributed_crawler

logger = logging.getLogger(__name__)


class WebsiteStatusFilter(SimpleListFilter):
    """网站状态过滤器"""
    title = '网站状态'
    parameter_name = 'status'

    def lookups(self, request, model_admin):
        return (
            ('enabled', '已启用'),
            ('disabled', '已禁用'),
            ('no_articles', '无文章'),
            ('recent_crawl', '最近爬取'),
        )

    def queryset(self, request, queryset):
        if self.value() == 'enabled':
            return queryset.filter(enabled=True)
        elif self.value() == 'disabled':
            return queryset.filter(enabled=False)
        elif self.value() == 'no_articles':
            return queryset.annotate(article_count=Count('article')).filter(article_count=0)
        elif self.value() == 'recent_crawl':
            week_ago = timezone.now() - timedelta(days=7)
            return queryset.filter(last_crawl__gte=week_ago)
        return queryset


class ArticleDateFilter(SimpleListFilter):
    """文章日期过滤器"""
    title = '发布时间'
    parameter_name = 'date_range'

    def lookups(self, request, model_admin):
        return (
            ('today', '今天'),
            ('week', '本周'),
            ('month', '本月'),
            ('quarter', '本季度'),
        )

    def queryset(self, request, queryset):
        now = timezone.now()
        if self.value() == 'today':
            return queryset.filter(created_at__date=now.date())
        elif self.value() == 'week':
            week_start = now - timedelta(days=now.weekday())
            return queryset.filter(created_at__gte=week_start.replace(hour=0, minute=0, second=0))
        elif self.value() == 'month':
            return queryset.filter(created_at__year=now.year, created_at__month=now.month)
        elif self.value() == 'quarter':
            quarter = (now.month - 1) // 3
            quarter_start_month = quarter * 3 + 1
            return queryset.filter(
                created_at__year=now.year,
                created_at__month__gte=quarter_start_month,
                created_at__month__lt=quarter_start_month + 3
            )
        return queryset


class WebsiteAdmin(admin.ModelAdmin):
    """网站管理"""
    list_display = [
        'name', 'base_url', 'enabled', 'article_count',
        'last_crawl_display', 'status_indicator', 'actions_column'
    ]
    list_filter = [WebsiteStatusFilter, 'enabled']
    search_fields = ['name', 'base_url']
    readonly_fields = ['article_count']
    actions = ['enable_websites', 'disable_websites', 'crawl_selected', 'crawl_all']

    fieldsets = (
        ('基本信息', {
            'fields': ('name', 'base_url', 'enabled')
        }),
        ('统计信息', {
            'fields': ('article_count',),
            'classes': ('collapse',)
        }),
        ('时间信息', {
            'fields': (),
            'classes': ('collapse',)
        }),
    )

    # 添加get_websites方法以支持模板中的网站选择
    def get_websites(self, request):
        """获取所有启用的网站，用于模板中的选择框"""
        return Website.objects.filter(enabled=True)

    def article_count(self, obj):
        """文章数量"""
        return obj.article_set.count()

    article_count.short_description = '文章数量'

    def last_crawl_display(self, obj):
        """最后爬取时间显示"""
        return '未实现'

    last_crawl_display.short_description = '最后爬取'

    def status_indicator(self, obj):
        """状态指示器"""
        if obj.enabled:
            return format_html('<span style="color: green;">●</span> 正常')
        else:
            return format_html('<span style="color: red;">●</span> 禁用')

    status_indicator.short_description = '状态'

    def actions_column(self, obj):
        """操作列"""
        return format_html(
            '<a href="{}" class="button">爬取</a> '
            '<a href="{}" class="button">查看文章</a>',
            reverse('admin:crawl_website', args=[obj.id]),
            reverse('admin:core_article_changelist') + f'?website__id__exact={obj.id}'
        )

    actions_column.short_description = '操作'

    def enable_websites(self, request, queryset):
        """启用选中的网站"""
        updated = queryset.update(enabled=True)
        self.message_user(request, f'成功启用 {updated} 个网站')

    enable_websites.short_description = '启用选中的网站'

    def disable_websites(self, request, queryset):
        """禁用选中的网站"""
        updated = queryset.update(enabled=False)
        self.message_user(request, f'成功禁用 {updated} 个网站')

    disable_websites.short_description = '禁用选中的网站'

    def crawl_selected(self, request, queryset):
        """爬取选中的网站"""
        for website in queryset:
            try:
                task = crawl_website.delay(website.id)
                self.message_user(
                    request,
                    f'网站 {website.name} 爬取任务已启动 (任务ID: {task.id})',
                    messages.SUCCESS
                )
            except Exception as e:
                error_msg = str(e)
                if "[Errno 61] Connection refused" in error_msg:
                    detailed_msg = "连接被拒绝，可能是Redis或其他依赖服务未启动。请检查以下几点：\n1. Redis服务是否运行 (尝试运行: redis-server)\n2. 如果使用Docker，请确保容器正在运行\n3. 检查Django配置中的CELERY_BROKER_URL设置\n4. 在本地开发环境中，可以运行 'python manage.py runserver' 和 'celery -A myproject worker -l info' 来启动必要的服务"
                else:
                    detailed_msg = error_msg
                self.message_user(
                    request,
                    f'网站 {website.name} 爬取任务启动失败: {detailed_msg}',
                    messages.ERROR
                )

    crawl_selected.short_description = '爬取选中的网站'

    def crawl_all(self, request, queryset):
        try:
            task = crawl_all_websites.delay()
            self.message_user(
                request,
                f'批量爬取任务已启动 (任务ID: {task.id})',
                messages.SUCCESS
            )
        except Exception as e:
            error_msg = str(e)
            if "[Errno 61] Connection refused" in error_msg:
                detailed_msg = "连接被拒绝，可能是Redis或其他依赖服务未启动。请检查以下几点：\n1. Redis服务是否运行 (尝试运行: redis-server)\n2. 如果使用Docker，请确保容器正在运行\n3. 检查Django配置中的CELERY_BROKER_URL设置\n4. 在本地开发环境中，可以运行 'python manage.py runserver' 和 'celery -A myproject worker -l info' 来启动必要的服务"
            else:
                detailed_msg = error_msg
            self.message_user(
                request,
                f'批量爬取任务启动失败: {detailed_msg}',
                messages.ERROR
            )

    #    crawl_all.short_description = '爬取所有网站'

    def get_urls(self):
        """添加自定义URL"""
        urls = super().get_urls()
        custom_urls = [
            path(
                '<int:website_id>/crawl/',
                self.admin_site.admin_view(self.crawl_website_view),
                name='crawl_website',
            ),
            path(
                'run-crawler/',
                self.admin_site.admin_view(self.run_crawler_view),
                name='run_crawler',
            ),
        ]
        return custom_urls + urls

    def crawl_website_view(self, request, website_id):
        """爬取单个网站视图"""
        try:
            website = Website.objects.get(id=website_id)
            task = crawl_website.delay(website_id)
            self.message_user(
                request,
                f'网站 {website.name} 爬取任务已启动 (任务ID: {task.id})',
                messages.SUCCESS
            )
        except Website.DoesNotExist:
            self.message_user(request, '网站不存在', messages.ERROR)
        except Exception as e:
            error_msg = str(e)
            if "[Errno 61] Connection refused" in error_msg:
                detailed_msg = "连接被拒绝，可能是Redis或其他依赖服务未启动。请检查以下几点：\n1. Redis服务是否运行 (尝试运行: redis-server)\n2. 如果使用Docker，请确保容器正在运行\n3. 检查Django配置中的CELERY_BROKER_URL设置\n4. 在本地开发环境中，可以运行 'python manage.py runserver' 和 'celery -A myproject worker -l info' 来启动必要的服务"
            else:
                detailed_msg = error_msg
            self.message_user(request, f'爬取任务启动失败: {detailed_msg}', messages.ERROR)

        return HttpResponseRedirect(reverse('admin:core_website_changelist'))

    def run_crawler_view(self, request):
        """运行爬虫视图"""
        try:
            task = crawl_all_websites.delay()
            self.message_user(
                request,
                f'批量爬取任务已启动 (任务ID: {task.id})',
                messages.SUCCESS
            )
        except Exception as e:
            error_msg = str(e)
            if "[Errno 61] Connection refused" in error_msg:
                detailed_msg = "连接被拒绝，可能是Redis或其他依赖服务未启动。请检查以下几点：\n1. Redis服务是否运行 (尝试运行: redis-server)\n2. 如果使用Docker，请确保容器正在运行\n3. 检查Django配置中的CELERY_BROKER_URL设置\n4. 在本地开发环境中，可以运行 'python manage.py runserver' 和 'celery -A myproject worker -l info' 来启动必要的服务"
            else:
                detailed_msg = error_msg
            self.message_user(
                request,
                f'批量爬取任务启动失败: {detailed_msg}',
                messages.ERROR
            )

        return HttpResponseRedirect(reverse('admin:core_website_changelist'))


class ArticleAdmin(admin.ModelAdmin):
    """文章管理"""
    list_display = [
        'title', 'website', 'created_at',
        'media_count', 'actions_column'
    ]
    list_filter = [
        ArticleDateFilter, 'website', 'created_at'
    ]
    search_fields = ['title', 'content', 'url']
    readonly_fields = ['created_at', 'media_files_display']
    date_hierarchy = 'created_at'

    fieldsets = (
        ('基本信息', {
            'fields': ('title', 'url', 'website')
        }),
        ('内容', {
            'fields': ('content',)
        }),
        ('媒体文件', {
            'fields': ('media_files_display',),
            'classes': ('collapse',)
        }),
        ('时间信息', {
            'fields': ('created_at',),
            'classes': ('collapse',)
        }),
    )

    def content_preview(self, obj):
        """内容预览"""
        return obj.content[:100] + '...' if len(obj.content) > 100 else obj.content

    content_preview.short_description = '内容预览'

    def media_count(self, obj):
        """媒体文件数量"""
        if obj.media_files:
            return len(obj.media_files)
        return 0

    media_count.short_description = '媒体文件'

    def media_files_display(self, obj):
        """媒体文件显示"""
        if not obj.media_files:
            return '无媒体文件'

        html = '<div style="max-height: 300px; overflow-y: auto;">'
        for i, media in enumerate(obj.media_files):
            if media.get('type') == 'image':
                html += f'<div style="margin: 10px 0;"><img src="{media["url"]}" style="max-width: 200px; max-height: 150px;" /></div>'
            elif media.get('type') == 'video':
                html += f'<div style="margin: 10px 0;"><video controls style="max-width: 200px;"><source src="{media["url"]}" type="video/mp4"></video></div>'
        html += '</div>'
        return format_html(html)

    media_files_display.short_description = '媒体文件'

    def actions_column(self, obj):
        """操作列"""
        # 修改: 添加跳转到本地文章详情页的链接
        return format_html(
            '<a href="{}" target="_blank" class="button">查看原文</a> '
            '<a href="{}" target="_blank" class="button">本地查看</a>',
            obj.url,
            reverse('article_detail', args=[obj.id])
        )

    actions_column.short_description = '操作'


class CrawlerStatusAdmin(admin.ModelAdmin):
    """爬虫状态管理"""
    change_list_template = 'admin/crawler_status.html'

    def changelist_view(self, request, extra_context=None):
        """爬虫状态视图"""
        # 获取分布式爬虫状态
        nodes = distributed_crawler.get_available_nodes()
        node_statuses = []

        for node_id in nodes:
            status = distributed_crawler.get_node_status(node_id)
            node_statuses.append(status)

        # 获取最近的批次
        batches = distributed_crawler.get_all_batches()[:10]

        # 获取任务统计
        task_stats = {
            'active_tasks': len([n for n in node_statuses if n['active_tasks'] > 0]),
            'total_nodes': len(nodes),
            'total_batches': len(batches),
        }

        extra_context = extra_context or {}
        extra_context.update({
            'nodes': node_statuses,
            'batches': batches,
            'task_stats': task_stats,
        })

        return super().changelist_view(request, extra_context)


# 注册管理类
admin.site.register(Website, WebsiteAdmin)
admin.site.register(Article, ArticleAdmin)

# 自定义管理站点标题
admin.site.site_header = 'Green Classroom 管理系统'
admin.site.site_title = 'Green Classroom'
admin.site.index_title = '欢迎使用 Green Classroom 管理系统'