from django.contrib import admin
from django.utils.translation import gettext_lazy as _
from .models import Course, Chapter, ChapterContent, CourseFavorite, CourseMaterial


class ChapterInline(admin.StackedInline):
    model = Chapter
    extra = 0


class ChapterContentInline(admin.StackedInline):
    model = ChapterContent
    extra = 0


class MaterialInline(admin.TabularInline):
    model = CourseMaterial
    extra = 0


@admin.register(Course)
class CourseAdmin(admin.ModelAdmin):
    list_display = ['title', 'category', 'level', 'status', 'author', 'sort_order', 'is_hot', 'is_new', 'created_at']
    list_filter = ['category', 'level', 'status', 'is_hot', 'is_new']
    search_fields = ['title', 'description']
    ordering = ['-sort_order', '-created_at']
    inlines = [ChapterInline]


@admin.register(Chapter)
class ChapterAdmin(admin.ModelAdmin):
    list_display = ['title', 'course', 'sort_order', 'duration', 'is_free', 'created_at']
    list_filter = ['course', 'is_free']
    search_fields = ['title']
    ordering = ['sort_order']
    inlines = [ChapterContentInline, MaterialInline]


@admin.register(CourseMaterial)
class CourseMaterialAdmin(admin.ModelAdmin):
    list_display = ['title', 'chapter', 'file_type', 'file_size', 'download_count', 'sort_order', 'created_at']
    list_filter = ['file_type', 'created_at']
    search_fields = ['title', 'chapter__title']
    ordering = ['sort_order']
    readonly_fields = ['download_count', 'created_at']


@admin.register(ChapterContent)
class ChapterContentAdmin(admin.ModelAdmin):
    list_display = ['chapter', 'md_file_path', 'updated_at']
    search_fields = ['content_md', 'chapter__title']


@admin.register(CourseFavorite)
class CourseFavoriteAdmin(admin.ModelAdmin):
    list_display = ['user', 'course', 'created_at']
    list_filter = ['created_at']
    search_fields = ['user__username', 'course__title']
    ordering = ['-created_at']
    list_per_page = 30
    readonly_fields = ['created_at']