// 班级 — 老师创建，学生通过班级码加入

use sea_orm::entity::prelude::*;
use serde::{Deserialize, Serialize};

#[derive(Clone, Debug, PartialEq, DeriveEntityModel, Serialize, Deserialize)]
#[sea_orm(table_name = "school_classes")]
pub struct Model {
    #[sea_orm(primary_key, auto_increment = false)]
    pub id: Uuid,
    pub tenant_id: Uuid,
    /// 班级名称
    pub name: String,
    /// 学校名称
    #[serde(skip_serializing_if = "Option::is_none")]
    pub school_name: Option<String>,
    /// 创建者（老师）ID
    pub teacher_id: Uuid,
    /// 6 位班级码（字母数字混合，62^6 ≈ 568 亿种组合）
    pub class_code: String,
    /// 成员数量（缓存字段）
    pub member_count: i32,
    /// 是否激活
    pub is_active: bool,
    /// 班级码过期时间（学期结束自动失效）
    #[serde(skip_serializing_if = "Option::is_none")]
    pub expires_at: Option<DateTimeUtc>,
    pub created_at: DateTimeUtc,
    pub updated_at: DateTimeUtc,
    pub created_by: Uuid,
    pub updated_by: Uuid,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub deleted_at: Option<DateTimeUtc>,
    pub version: i32,
}

#[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
pub enum Relation {
    #[sea_orm(has_many = "super::class_member::Entity")]
    ClassMember,
    #[sea_orm(has_many = "super::topic_assignment::Entity")]
    TopicAssignment,
    #[sea_orm(has_many = "super::journal_entry::Entity")]
    JournalEntry,
}

impl Related<super::class_member::Entity> for Entity {
    fn to() -> RelationDef {
        Relation::ClassMember.def()
    }
}

impl Related<super::topic_assignment::Entity> for Entity {
    fn to() -> RelationDef {
        Relation::TopicAssignment.def()
    }
}

impl Related<super::journal_entry::Entity> for Entity {
    fn to() -> RelationDef {
        Relation::JournalEntry.def()
    }
}

impl ActiveModelBehavior for ActiveModel {}