import os
import hashlib

from django.contrib import admin
from django.contrib import messages
from django import forms
from django.utils.translation import gettext_lazy as _
from django.db import models
from django.utils.html import format_html
from django.shortcuts import redirect
from django.urls import reverse_lazy

from unfold.admin import ModelAdmin, StackedInline, TabularInline
from unfold.decorators import action, display
from unfold.contrib.forms.widgets import WysiwygWidget
from unfold.sections import TableSection
from unfold.contrib.filters.admin import (
    ChoicesDropdownFilter,
    MultipleRelatedDropdownFilter,
    RangeDateFilter,
    RangeNumericFilter,
    TextFilter,
)
from unfold.widgets import (
    UnfoldAdminColorInputWidget,
    UnfoldAdminRadioSelectWidget,
    UnfoldAdminSelectWidget,
    UnfoldAdminSplitDateTimeWidget,
    UnfoldAdminTextInputWidget,
)

from unfold.contrib.forms.widgets import ArrayWidget
from django.contrib.postgres.fields import ArrayField

from utils.admin import project_admin_site
from utils.json_editor_field import JsonEditorWidget
from apps.course.models import Course, Glossary, Attachment, CourseCategory, Participant
from apps.course.models.lesson import Lesson
from apps.account.models import StudentUser

from utils.schema import get_weekly_timing_schema, get_course_feature_schema


class CourseTableSection(TableSection):
    verbose_name = _("Course Categories")
    related_name = "courses"
    height = 380
    fields = [
        "title",
        "status",
        "edit_link"
    ]

    def edit_link(self, instance):
        from django.utils.html import format_html

        return format_html(
            '<a href="/admin/course/course/{}/change/" class="leading-none">'
            '<span class="material-symbols-outlined leading-none text-base-500">visibility</span>'
            '</a>',
            instance.id
        )

    edit_link.short_description = _("Edit")

            
class CourseCategoryAdmin(ModelAdmin):
    list_display = ('name', 'slug', 'course_count')
    search_fields = ('name',)
    # exclude = ('slug', )

    list_sections = [CourseTableSection]
    fieldsets = (
        (None, {
            'fields': ('name', 'slug')
        }),
    )

    @display(description=_("Courses"))
    def course_count(self, obj):
        count = obj.courses.all().count()
        return format_html(
            '<span class="badge badge-primary">{}</span>',
            count
        )



class CourseForm(forms.ModelForm):
    class Meta:
        model = Course
        fields = '__all__'
        exclude = ('slug',)
        widgets = {
            'timing': JsonEditorWidget(attrs={
                'schema': get_weekly_timing_schema(),
                'title': _('Course Weekly Schedule'),
            }),
            'features': JsonEditorWidget(attrs={
                'schema': get_course_feature_schema(),
                'title': _('Course Features'),
            }),
        }
        help_texts = {
            'status': 'If set to inactive, the course will not be displayed.',
        }


class AttachmentInline(TabularInline):
    model = Attachment
    extra = 0
    fields = ('title', 'file', 'file_size')
    tab = True

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


class GlossaryInline(StackedInline):
    model = Glossary
    fields = ('title', 'description')
    extra = 0
    tab = True
    show_change_link = True


class LessonInline(StackedInline):
    model = Lesson
    fields = ('title', 'is_active', 'duration', 'content_type', 'content_file', 'video_link', 'priority',)
    extra = 0
    tab = True
    show_change_link = True
    ordering_field = "priority"
    conditional_fields = {
        'content_file': "content_type == 'video_file'",
        'video_link': "content_type == 'youtube_link'",
    }


class ParticipantAdmin(ModelAdmin):
    list_display = ('student_name', 'course_title', 'joined_date',)
    list_filter = (
        ('course', MultipleRelatedDropdownFilter),
    )
    search_fields = ('student__email', 'student__fullname', 'course__title')
    readonly_fields = ('joined_date',)
    autocomplete_fields = ('student', 'course')
    fieldsets = (
        (None, {
            'fields': ('student', 'course',)
        }),
        (_('Enrollment Details'), {
            'fields': ('joined_date', 'last_activity', 'progress')
        }),
    )

    @display(description=_("Student"), header=True)
    def student_name(self, instance: StudentUser):
        from django.templatetags.static import static

        # Get avatar image path - use user's avatar if available, otherwise use default
        avatar_path = instance.student.avatar.url if instance.student.avatar else static("images/reading(1).png")

        return [
            instance.student.fullname,
            None,
            None,
            {
            "path": avatar_path,
            "height": 30,
            "width": 36,
            "borderless": True,
            # "squared": True,
            },
        ]
            
    @admin.display(description=_("Course"))
    def course_title(self, obj):
        if obj.course:
            return obj.course.title
        return "-"

class ParticipantInline(TabularInline):
    model = Participant
    fields = ('student', 'joined_date', )
    readonly_fields = ('joined_date', 'student')
    extra = 0
    tab = True
    verbose_name = _("Participant")
    verbose_name_plural = _("Participants")
    show_change_link = True
    
    autocomplete_fields = ('student',)
    def get_queryset(self, request):
        qs = super().get_queryset(request)
        return qs.order_by('-joined_date')
    def has_add_permission(self, request, obj):
        return False

    def has_change_permission(self, request, obj=None):
        return False

    def has_delete_permission(self, request, obj=None):
        return False



    
from django.urls import reverse

from django import forms
from django.shortcuts import render, redirect
from django.contrib import messages

from unfold.widgets import UnfoldAdminSelectWidget

class AddStudentForm(forms.Form):
    student = forms.ModelChoiceField(
        queryset=StudentUser.objects.filter(is_active=True),
        label=_("Select Student"),
        widget=UnfoldAdminSelectWidget,  
        required=True
    )
        
        
class CourseAdmin(ModelAdmin):
    form = CourseForm
    inlines = [LessonInline, AttachmentInline, GlossaryInline, ParticipantInline]
    list_display = ('display_header', 'category', 'display_professor', 'status', 'display_price', 'is_online')
    list_filter = [
        ('status', ChoicesDropdownFilter),
        ('level', ChoicesDropdownFilter),
        'is_online',
        'is_free',
        ('category', MultipleRelatedDropdownFilter),
        ('price', RangeNumericFilter),
    ]
    save_as = True
    warn_unsaved_form = True
    # compressed_fields = True    
    search_fields = ('id','title', 'description')
    exclude = ('slug', )
    readonly_fields = ('final_price',)
    autocomplete_fields = ('category', 'professor',)
    list_filter_submit = True
    change_form_show_cancel_button = True
    radio_fields = {
        "video_type": admin.HORIZONTAL,
        "status": admin.HORIZONTAL,
        "level": admin.HORIZONTAL,
    }
    show_facets = admin.ShowFacets.ALLOW
    formfield_overrides = {
        models.TextField: {
            "widget": WysiwygWidget,
        },
    }
    conditional_fields = {
        'price': "is_free == false",
        'discount_percentage': "is_free == false",
        'final_price': "is_free == false",
        'online_link': "is_online",
        'video_file': "video_type == 'video_file'",
        'video_link': "video_type == 'youtube_link'",
    }

    fieldsets = (
        (None, {
            'fields': ('title', 'category', 'professor', 'thumbnail')
        }),
        (_('Status'), {
            'fields': ('status', 'is_online', 'online_link'),
        }),
        (_('Course Details'), {
            'fields': ('description', 'short_description', 'level', 'duration', 'lessons_count',),
            'classes': ['tab'],
        }),
        (_('Media'), {
            'fields': ('video_type', 'video_file', 'video_link'),
        }),
        (_('Pricing'), {
            'fields': ('is_free', 'price', 'discount_percentage', 'final_price'),
        }),
        (_('Timing & Features'), {
            'fields': ('timing', 'features'),
            'classes': ['tab'],
        }),
    )

        
    @display(description=_("Course"), header=True)
    def display_header(self, instance):
        from django.templatetags.static import static
        
        thumbnail_path = instance.thumbnail.url if instance.thumbnail else None
        
        return [
            instance.title,
            instance.short_description or _("No description"),
            None,
            {
                "path": thumbnail_path,
                "height": 40,
                "width": 60,
                "squared": True,
                "borderless": True,
            },
        ]
    
    @display(description=_("Professor"))
    def display_professor(self, instance):
        return instance.professor.fullname
    
    @display(description=_("Price"))
    def display_price(self, instance):
        if instance.is_free:
            return format_html('<span class="text-green-600 font-medium">{}</span>', _("Free"))
        
        if instance.discount_percentage > 0:
            return format_html(
                '<span class="line-through text-gray-400 mr-2">${}</span>'
                '<span class="text-green-600 font-medium">${}</span>',
                instance.price,
                instance.final_price
            )
        
        return format_html('<span>${}</span>', instance.final_price)
    
    
    actions_row = [
        "view_course_lessons",
        "add_student_to_course"
    ]
    actions_detail = ['add_student_to_course',]
    

    @action(
        description=_("View Lessons"),
        icon="menu_book",
        url_path="actions-row-custom-url",
        permissions=[
            "is_course_professor",
        ],
    )
    def view_course_lessons(self, request, object_id):
        """Navigate to the list of lessons for this course."""
        course = self.get_object(request, object_id)
        if not course:
            messages.error(request, _("Course not found"))
            return redirect(request.META.get("HTTP_REFERER") or reverse_lazy("admin:course_course_changelist"))

        # Redirect to the lesson list filtered by this course
        from django.urls import reverse
        url = f"{reverse('admin:course_lesson_changelist')}?course__id__exact={course.id}"
        return redirect(url)


    def has_is_course_professor_permission(self, request, object_id=None):

        try:
            if request.user.is_staff:
                return True
            course = self.get_object(request, object_id)
            # Check if the current user is the professor of this course
            return course and hasattr(request.user, 'professor') and course.professor_id == request.user.id
        except Exception as e:
            print(e)
            return False

    


    @action(
        description=_("Add Student to Course"),
        icon="person_add",
        permissions=[
            "is_course_professor",
        ],
    )
    def add_student_to_course(self, request, object_id):
        """Add a student to this course as a participant."""
        course = self.get_object(request, object_id)
        if not course:
            messages.error(request, _("Course not found"))
            return redirect(reverse("admin:course_course_changelist"))

        if request.method == 'POST':
            form = AddStudentForm(request.POST)
            if form.is_valid():
                student = form.cleaned_data['student']

                # Check if the student is already a participant
                if Participant.objects.filter(student=student, course=course).exists():
                    messages.warning(request, _(f"Student {student.fullname} is already enrolled in this course"))
                else:
                    # Create a new participant
                    Participant.objects.create(
                        student=student,
                        course=course,
                    )
                    messages.success(
                        request, 
                        _(f"Student {student.fullname} has been successfully added to {course.title}")
                    )

                return redirect(reverse("admin:course_course_changelist"))
        else:
            form = AddStudentForm()

        return render(
            request,
            "course/add_student_form.html",
            {
                "form": form,
                "object": object,
                "title": _("Change detail action for {}").format(object),
                **self.admin_site.each_context(request),
            },
        )

    
class GlossaryAdmin(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


class AttachmentAdmin(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)


# Register with the project admin site
project_admin_site.register(Course, CourseAdmin)
project_admin_site.register(CourseCategory, CourseCategoryAdmin)
project_admin_site.register(Glossary, GlossaryAdmin)
project_admin_site.register(Attachment, AttachmentAdmin)
project_admin_site.register(Participant, ParticipantAdmin)