from django.db import models
from django.contrib.auth.models import User
from course.models import Course
from schedule.models import Lesson
from instructor.models import Instructor
from student.models import Student

class CourseAnalytics(models.Model):
    course = models.ForeignKey(Course, on_delete=models.CASCADE)
    total_students = models.IntegerField(default=0)
    average_progress = models.DecimalField(max_digits=5, decimal_places=2, default=0)
    completion_rate = models.DecimalField(max_digits=5, decimal_places=2, default=0)
    revenue = models.DecimalField(max_digits=10, decimal_places=2, default=0)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    def __str__(self):
        return f"Аналитика курса {self.course.title}"

class InstructorAnalytics(models.Model):
    instructor = models.ForeignKey(Instructor, on_delete=models.CASCADE)
    total_lessons = models.IntegerField(default=0)
    total_students = models.IntegerField(default=0)
    average_rating = models.DecimalField(max_digits=3, decimal_places=2, default=5.00)
    completion_rate = models.DecimalField(max_digits=5, decimal_places=2, default=0)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    def __str__(self):
        return f"Аналитика инструктора {self.instructor}"

class StudentAnalytics(models.Model):
    student = models.ForeignKey(Student, on_delete=models.CASCADE)
    total_lessons = models.IntegerField(default=0)
    attendance_rate = models.DecimalField(max_digits=5, decimal_places=2, default=0)
    average_grade = models.DecimalField(max_digits=3, decimal_places=2, default=0)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    def __str__(self):
        return f"Аналитика студента {self.student}"