from django.contrib import admin
from django.utils.translation import gettext_lazy as _
from django.urls import reverse
from django.utils.html import format_html
from ajaxdatatable.admin import AjaxDatatable
from unfold.admin import ModelAdmin
from django.contrib.admin import SimpleListFilter
from unfold.decorators import display, action
from django import forms

from utils.admin import project_admin_site
from apps.library.models import *


class BookCollectionAdmin(ModelAdmin):
    list_display = ('title', 'display_position', 'status', 'order')
    list_filter = ('status', 'display_position')
    search_fields = ('title',)

project_admin_site.register(BookCollection, BookCollectionAdmin)

class BookAdminForm(forms.ModelForm):
    class Meta:
        model = Book
        fields = '__all__'
        
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        # Make thumbnail field required in the form
        self.fields['thumbnail'].required = True

class BookAdmin(ModelAdmin):
    form = BookAdminForm
    list_display = ('title', 'display_categories', 'display_collections', 'status', 'view_count', 'created_at')
    list_filter = ('status', 'pin', 'file_type', 'created_at', 'updated_at')
    search_fields = ('title', 'slug', 'summary', 'description')
    # autocomplete_fields = ('categories', 'collections', )
    list_filter_submit = True
    warn_unsaved_form = True
    change_form_show_cancel_button = True
    
    save_as = True

    @display(description=_('Categories'))
    def display_categories(self, obj):
        categories = obj.categories.all()
        if categories:
            return ', '.join([category.title for category in categories])
        return '-'
    
    @display(description=_('Collections'))
    def display_collections(self, obj):
        collections = obj.collections.all()
        if collections:
            return ', '.join([collection.title for collection in collections])
        return '-'
    
    fieldsets = (
        (None, {
            'fields': ('title',  'summary', 'description', 'thumbnail', 'pages_count')
        }),
        (_('Status'), {
            'fields': ('status', 'pin')
        }),
        (_('File Information'), {
            'fields': ('file_type', 'book_file')
        }),
        (_('Relations'), {
            'fields': ('categories', 'collections')
        }),
        (_('Statistics'), {
            'fields': ('view_count', 'download_count')
        }),
    )

class BookCollectionAdminBase(ModelAdmin):
    """Base admin class for all book collection types"""
    list_display = ('get_title', 'status', 'order', 'count_books')
    list_filter = ('status', 'order')
    search_fields = ('title',)
    autocomplete_fields = ('books',)
    ordering = ('order',)
    list_filter_submit = True
    warn_unsaved_form = True
    change_form_show_cancel_button = True
    

    fieldsets = (
        (None, {
            'fields': ('title', 'summary', 'status', 'order')
        }),
        (_('Books'), {
            'fields': ('books',)
        }),
    )

    exclude = ('display_position',)

    @display(description=_('Title'))
    def get_title(self, obj):
        return str(obj.title)
    
    # @display(description=_("Status"), ordering="status")
    # def status_badge(self, obj):
    #     if obj.status:
    #         return format_html(
    #             '<span class="bg-green-100 text-green-800 px-2 py-1 rounded-full text-xs font-medium">{}</span>',
    #             _("Active")
    #         )
    #     return format_html(
    #         '<span class="bg-red-100 text-red-800 px-2 py-1 rounded-full text-xs font-medium">{}</span>',
    #         _("Inactive")
    #     )
    
    @display(description=_('Number of Books'))
    def count_books(self, obj):
        count = obj.books.count()
        if count > 0:
            url = reverse('admin:library_book_changelist') + f'?collections__id__exact={obj.id}'
            return format_html('<a href="{}">{}</a>', url, count)
        return count
        
    





class PinnedBookCollectionAdmin(BookCollectionAdminBase):
    """Admin for pinned book collections only"""
    list_before_template = "admin/library/pinnedbookcollection/change_list_before.html"
    
    fieldsets = (
        (None, {
            'fields': ('title', 'summary', 'status', 'order', 'pin_top')
        }), 
        (_('Books'), {
            'fields': ('books',)
        }),
    )

    def get_queryset(self, request):
        # Only show pinned collections
        return super().get_queryset(request).filter(display_position=BookCollection.DisplayPosition.PINNED)

    def save_model(self, request, obj, form, change):
        # Ensure the display_position is always set to PINNED
        obj.display_position = BookCollection.DisplayPosition.PINNED
        super().save_model(request, obj, form, change)


class MiddleBookCollectionAdmin(BookCollectionAdminBase):
    """Admin for middle section book collections only"""

    def get_queryset(self, request):
        # Only show middle section collections
        return super().get_queryset(request).filter(display_position=BookCollection.DisplayPosition.MIDDLE)

    # def has_add_permission(self, request):
    #     # Check if a middle collection already exists
    #     exists = BookCollection.objects.filter(display_position=BookCollection.DisplayPosition.MIDDLE).exists()
    #     # Only allow adding if no middle collection exists
    #     return not exists

    # def has_delete_permission(self, request, obj=None):
    #     # Prevent deletion of the middle collection
    #     return False

    def save_model(self, request, obj, form, change):
        # Ensure the display_position is always set to MIDDLE
        obj.display_position = BookCollection.DisplayPosition.MIDDLE
        super().save_model(request, obj, form, change)




class CategoryAdmin(ModelAdmin):
    list_display = ('title', 'slug', 'status_badge', 'count_books', 'created_at')
    list_filter = ('status', 'created_at', 'updated_at')
    search_fields = ('title', 'slug')
    list_filter_submit = True
    warn_unsaved_form = True
    change_form_show_cancel_button = True
    
    # Custom actions
    actions_list = ['mark_as_active', 'mark_as_inactive']
    actions_row = ['toggle_status']
    
    fieldsets = (
        (None, {
            'fields': ('title', 'slug', 'status')
        }),
        (_('Timestamps'), {
            'fields': ('created_at', 'updated_at'),
            'classes': ('collapse',),
        }),
    )
    
    readonly_fields = ('created_at', 'updated_at')

    @display(description=_("Status"), ordering="status")
    def status_badge(self, obj):
        if obj.status:
            return format_html(
                '<span class="bg-green-100 text-green-800 px-2 py-1 rounded-full text-xs font-medium">{}</span>',
                _("Active")
            )
        return format_html(
            '<span class="bg-red-100 text-red-800 px-2 py-1 rounded-full text-xs font-medium">{}</span>',
            _("Inactive")
        )
    
    @display(description=_('Number of Books'))
    def count_books(self, obj):
        count = obj.books_count
        if count > 0:
            url = reverse('admin:library_book_changelist') + f'?categories__id__exact={obj.id}'
            return format_html('<a href="{}">{}</a>', url, count)
        return count
        
    @action(description=_("Mark selected categories as active"))
    def mark_as_active(self, request, queryset):
        updated = queryset.update(status=True)
        self.message_user(request, _("%(count)d categories were successfully marked as active.") % {"count": updated})
    
    @action(description=_("Mark selected categories as inactive"))
    def mark_as_inactive(self, request, queryset):
        updated = queryset.update(status=False)
        self.message_user(request, _("%(count)d categories were successfully marked as inactive.") % {"count": updated})
    
    @action(description=_("Toggle status"))
    def toggle_status(self, request, obj):
        obj.status = not obj.status
        obj.save(update_fields=["status"])
        status_text = _("active") if obj.status else _("inactive")
        self.message_user(request, _("Category '%(title)s' is now %(status)s.") % {"title": obj.title, "status": status_text})


# Register models with the custom admin site
project_admin_site.register(Book, BookAdmin)
project_admin_site.register(PinnedBookCollection, PinnedBookCollectionAdmin)
project_admin_site.register(MiddleBookCollection, MiddleBookCollectionAdmin)
project_admin_site.register(Category, CategoryAdmin)