import os
import hashlib

from django.contrib import admin
from django import forms
from ajaxdatatable.admin import AjaxDatatable

from utils.json_editor_field import JsonEditorWidget
from apps.course.models import Course, Glossary, Attachment, CourseCategory
from utils.schema import get_weekly_timing_schema, get_course_feature_schema



@admin.register(CourseCategory)
class CourseCategoryAdmin(admin.ModelAdmin):
    list_display = ('name', 'slug')
    search_fields = ('name',)
    exclude = ('slug', )
    
    
    
class CourseForm(forms.ModelForm):
    class Meta:
        model = Course
        fields = '__all__'
        # exclude = ('slug',)
        widgets = {
            'timing': JsonEditorWidget(attrs={'schema': get_weekly_timing_schema}),
            'features': JsonEditorWidget(attrs={'schema': get_course_feature_schema}),            
        }


    


@admin.register(Course)
class CourseAdmin(AjaxDatatable):
    form = CourseForm
    list_display = ('title', 'category', 'level', 'status', 'final_price', 'is_online')
    list_filter = ('status', 'level', 'is_online', 'is_free', 'category')
    search_fields = ('title', 'description')
    exclude = ('slug', )

    # def has_change_permission(self, request, obj=None):
        # return False
    # @admin.display(description='Add Student')
    # def _add_student(self, obj):
        
    
    



@admin.register(Glossary)
class GlossaryAdmin(admin.ModelAdmin):
    list_display = ('title', 'course', 'description')
    list_filter = ('course',)
    search_fields = ('title', 'description', 'course__title')
    ordering = ('-id',)




class AttachmentAdminForm(forms.ModelForm):
    class Meta:
        model = Attachment
        fields = '__all__'
        
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        if 'file' in self.data or 'file' in self.files:
            file = self.files.get('file') 
            if file:
                file.name = self._shorten_file_name(file.name)

    
    def _shorten_file_name(self, file_name):
        max_length = 100
        if len(file_name) > max_length:
            base_name, ext = os.path.splitext(file_name)  # جدا کردن نام و پسوند
            allowed_length = max_length - len(ext)  # طول مجاز نام بدون پسوند

            # 80٪ از نام اصلی و 20٪ هش
            base_length = int(allowed_length * 0.8)  # 80٪ از طول مجاز
            hash_length = allowed_length - base_length  # 20٪ از طول مجاز

            base_part = base_name[:base_length]  # 80٪ اول نام اصلی
            hash_part = hashlib.sha256(base_name.encode('utf-8')).hexdigest()[:hash_length]  # 20٪ هش

            return f"{base_part}{hash_part}{ext}"  # ترکیب بخش اصلی و هش با پسوند

        return file_name
    
    
@admin.register(Attachment)
class AttachmentAdmin(admin.ModelAdmin):
    form = AttachmentAdminForm
    list_display = ('title', 'course', 'file', 'file_size')
    list_filter = ('course',)
    search_fields = ('title', 'file', 'course__title')

    def save_model(self, request, obj, form, change):
        if obj.file:
            obj.file_size = obj.file.size
        super().save_model(request, obj, form, change)