from django.contrib import admin
from unfold.admin import ModelAdmin, TabularInline, StackedInline
from apps.lms.models import (
    Course,
    CourseModule,
    Lesson,
    QuizQuestion,
    CourseEnrollment,
    LessonProgress,
    DigitalCertificate,
)


class LessonInline(TabularInline):
    model = Lesson
    extra = 1
    fields = ('order', 'title', 'lesson_type', 'duration_minutes', 'is_preview')


class CourseModuleInline(StackedInline):
    model = CourseModule
    extra = 1
    fields = ('order', 'title', 'description')


class QuizQuestionInline(StackedInline):
    model = QuizQuestion
    extra = 1
    fields = ('order', 'question_text', 'options', 'correct_option_index', 'explanation')


@admin.register(Course)
class CourseAdmin(ModelAdmin):
    list_display = ('title', 'category', 'language', 'level', 'instructor_name', 'is_published', 'is_featured', 'created_at')
    list_display_links = ('title', 'category', 'instructor_name')
    list_filter = ('category', 'language', 'level', 'is_published', 'is_featured')
    search_fields = ('title', 'description', 'instructor_name', 'organization_name')
    prepopulated_fields = {'slug': ('title',)}
    inlines = [CourseModuleInline]


@admin.register(CourseModule)
class CourseModuleAdmin(ModelAdmin):
    list_display = ('title', 'course', 'order', 'created_at')
    list_display_links = ('title', 'course')
    list_filter = ('course',)
    search_fields = ('title', 'description', 'course__title')
    inlines = [LessonInline]


@admin.register(Lesson)
class LessonAdmin(ModelAdmin):
    list_display = ('title', 'module', 'lesson_type', 'duration_minutes', 'order', 'is_preview')
    list_display_links = ('title', 'module')
    list_filter = ('lesson_type', 'is_preview', 'module__course')
    search_fields = ('title', 'content', 'module__title', 'module__course__title')
    inlines = [QuizQuestionInline]


@admin.register(QuizQuestion)
class QuizQuestionAdmin(ModelAdmin):
    list_display = ('question_text', 'lesson', 'correct_option_index', 'order')
    list_display_links = ('question_text', 'lesson')
    list_filter = ('lesson__module__course',)
    search_fields = ('question_text', 'explanation', 'lesson__title')


@admin.register(CourseEnrollment)
class CourseEnrollmentAdmin(ModelAdmin):
    list_display = ('user', 'course', 'progress_percentage', 'enrolled_at', 'completed_at')
    list_display_links = ('user', 'course')
    list_filter = ('course', 'progress_percentage')
    search_fields = ('user__email', 'user__fullname', 'course__title')


@admin.register(LessonProgress)
class LessonProgressAdmin(ModelAdmin):
    list_display = ('user', 'lesson', 'is_completed', 'quiz_score', 'completed_at')
    list_display_links = ('user', 'lesson')
    list_filter = ('is_completed', 'lesson__module__course')
    search_fields = ('user__email', 'user__fullname', 'lesson__title')


@admin.register(DigitalCertificate)
class DigitalCertificateAdmin(ModelAdmin):
    list_display = ('certificate_code', 'user', 'course', 'issue_date', 'final_score', 'is_revoked')
    list_display_links = ('certificate_code', 'user', 'course')
    list_filter = ('is_revoked', 'issue_date', 'course')
    search_fields = ('certificate_code', 'user__email', 'user__fullname', 'course__title')
    readonly_fields = ('uuid', 'created_at')