use serde::{Deserialize, Serialize};
use uuid::Uuid;
use chrono::{DateTime, Utc};

#[derive(Debug, Serialize, Deserialize, sqlx::FromRow)]
pub struct Course {
    pub id: Uuid,
    pub title: String,
    pub description: Option<String>,
    pub instructor_id: Uuid,
    pub start_date: Option<DateTime<Utc>>,
    pub end_date: Option<DateTime<Utc>>,
    pub created_at: DateTime<Utc>,
    pub updated_at: DateTime<Utc>,
}

#[derive(Debug, Serialize, Deserialize, sqlx::FromRow)]
pub struct Module {
    pub id: Uuid,
    pub course_id: Uuid,
    pub title: String,
    pub position: i32,
    pub created_at: DateTime<Utc>,
}

#[derive(Debug, Serialize, Deserialize, sqlx::FromRow)]
pub struct Lesson {
    pub id: Uuid,
    pub module_id: Uuid,
    pub title: String,
    pub content_type: String, 
    pub content_url: Option<String>,
    pub transcription: Option<serde_json::Value>,
    pub metadata: Option<serde_json::Value>,
    pub position: i32,
    pub created_at: DateTime<Utc>,
}

#[derive(Debug, Serialize, Deserialize, sqlx::FromRow)]
pub struct AuditLog {
    pub id: Uuid,
    pub user_id: Uuid,
    pub action: String,
    pub entity_type: String, 
    pub entity_id: Uuid,
    pub changes: serde_json::Value,
    pub created_at: DateTime<Utc>,
}

#[derive(Debug, Serialize, Deserialize, sqlx::FromRow)]
pub struct Enrollment {
    pub id: Uuid,
    pub user_id: Uuid,
    pub course_id: Uuid,
    pub enroled_at: DateTime<Utc>,
}

#[derive(Debug, Serialize, Deserialize, sqlx::FromRow)]
pub struct Asset {
    pub id: Uuid,
    pub filename: String,
    pub storage_path: String,
    pub mimetype: String,
    pub size_bytes: i64,
    pub created_at: DateTime<Utc>,
}