from django.contrib import admin
from django.contrib.admin import AdminSite
from django.utils.html import format_html
from django.urls import reverse
from django.utils.safestring import mark_safe
import pghistory
from .models import EditSubmission, PhotoSubmission

class ModerationAdminSite(AdminSite):
    site_header = 'ThrillWiki Moderation'
    site_title = 'ThrillWiki Moderation'
    index_title = 'Moderation Dashboard'
    
    def has_permission(self, request):
        """Only allow moderators and above to access this admin site"""
        return request.user.is_authenticated and request.user.role in ['MODERATOR', 'ADMIN', 'SUPERUSER']

moderation_site = ModerationAdminSite(name='moderation')

class EditSubmissionAdmin(admin.ModelAdmin):
    list_display = ['id', 'user_link', 'content_type', 'content_link', 'status', 'created_at', 'handled_by']
    list_filter = ['status', 'content_type', 'created_at']
    search_fields = ['user__username', 'reason', 'source', 'notes']
    readonly_fields = ['user', 'content_type', 'object_id', 'changes', 'created_at']
    
    def user_link(self, obj):
        url = reverse('admin:accounts_user_change', args=[obj.user.id])
        return format_html('<a href="{}">{}</a>', url, obj.user.username)
    user_link.short_description = 'User'
    
    def content_link(self, obj):
        if hasattr(obj.content_object, 'get_absolute_url'):
            url = obj.content_object.get_absolute_url()
            return format_html('<a href="{}">{}</a>', url, str(obj.content_object))
        return str(obj.content_object)
    content_link.short_description = 'Content'

    def save_model(self, request, obj, form, change):
        if 'status' in form.changed_data:
            if obj.status == 'APPROVED':
                obj.approve(request.user)
            elif obj.status == 'REJECTED':
                obj.reject(request.user)
            elif obj.status == 'ESCALATED':
                obj.escalate(request.user)
        super().save_model(request, obj, form, change)

class PhotoSubmissionAdmin(admin.ModelAdmin):
    list_display = ['id', 'user_link', 'content_type', 'content_link', 'photo_preview', 'status', 'created_at', 'handled_by']
    list_filter = ['status', 'content_type', 'created_at']
    search_fields = ['user__username', 'caption', 'notes']
    readonly_fields = ['user', 'content_type', 'object_id', 'photo_preview', 'created_at']
    
    def user_link(self, obj):
        url = reverse('admin:accounts_user_change', args=[obj.user.id])
        return format_html('<a href="{}">{}</a>', url, obj.user.username)
    user_link.short_description = 'User'
    
    def content_link(self, obj):
        if hasattr(obj.content_object, 'get_absolute_url'):
            url = obj.content_object.get_absolute_url()
            return format_html('<a href="{}">{}</a>', url, str(obj.content_object))
        return str(obj.content_object)
    content_link.short_description = 'Content'
    
    def photo_preview(self, obj):
        if obj.photo:
            return format_html('<img src="{}" style="max-height: 100px; max-width: 200px;" />', obj.photo.url)
        return ''
    photo_preview.short_description = 'Photo Preview'

    def save_model(self, request, obj, form, change):
        if 'status' in form.changed_data:
            if obj.status == 'APPROVED':
                obj.approve(request.user, obj.notes)
            elif obj.status == 'REJECTED':
                obj.reject(request.user, obj.notes)
        super().save_model(request, obj, form, change)

class HistoryAdmin(admin.ModelAdmin):
    """Admin interface for viewing model history events"""
    list_display = ['pgh_label', 'pgh_created_at', 'get_object_link', 'get_context']
    list_filter = ['pgh_label', 'pgh_created_at']
    readonly_fields = ['pgh_label', 'pgh_obj_id', 'pgh_data', 'pgh_context', 'pgh_created_at']
    date_hierarchy = 'pgh_created_at'

    def get_object_link(self, obj):
        """Display a link to the related object if possible"""
        if obj.pgh_obj and hasattr(obj.pgh_obj, 'get_absolute_url'):
            url = obj.pgh_obj.get_absolute_url()
            return format_html('<a href="{}">{}</a>', url, str(obj.pgh_obj))
        return str(obj.pgh_obj or '')
    get_object_link.short_description = 'Object'

    def get_context(self, obj):
        """Format the context data nicely"""
        if not obj.pgh_context:
            return '-'
        html = ['<table>']
        for key, value in obj.pgh_context.items():
            html.append(f'<tr><th>{key}</th><td>{value}</td></tr>')
        html.append('</table>')
        return mark_safe(''.join(html))
    get_context.short_description = 'Context'

# Register with moderation site only
moderation_site.register(EditSubmission, EditSubmissionAdmin)
moderation_site.register(PhotoSubmission, PhotoSubmissionAdmin)
moderation_site.register(pghistory.models.Event, HistoryAdmin)