// 班级成员表 — 复合主键

use sea_orm_migration::prelude::*;

#[derive(DeriveMigrationName)]
pub struct Migration;

#[async_trait::async_trait]
impl MigrationTrait for Migration {
    async fn up(&self, manager: &SchemaManager) -> Result<(), DbErr> {
        manager
            .create_table(
                Table::create()
                    .table(ClassMembers::Table)
                    .if_not_exists()
                    .col(ColumnDef::new(ClassMembers::ClassId).uuid().not_null())
                    .col(ColumnDef::new(ClassMembers::UserId).uuid().not_null())
                    .primary_key(
                        Index::create()
                            .col(ClassMembers::ClassId)
                            .col(ClassMembers::UserId),
                    )
                    .col(ColumnDef::new(ClassMembers::TenantId).uuid().not_null())
                    .col(ColumnDef::new(ClassMembers::Role).string().not_null().default("student"))
                    .col(ColumnDef::new(ClassMembers::Nickname).string().null())
                    .col(
                        ColumnDef::new(ClassMembers::JoinedAt)
                            .timestamp_with_time_zone()
                            .not_null()
                            .default(Expr::current_timestamp()),
                    )
                    .col(
                        ColumnDef::new(ClassMembers::CreatedAt)
                            .timestamp_with_time_zone()
                            .not_null()
                            .default(Expr::current_timestamp()),
                    )
                    .col(
                        ColumnDef::new(ClassMembers::UpdatedAt)
                            .timestamp_with_time_zone()
                            .not_null()
                            .default(Expr::current_timestamp()),
                    )
                    .col(ColumnDef::new(ClassMembers::CreatedBy).uuid().not_null())
                    .col(ColumnDef::new(ClassMembers::UpdatedBy).uuid().not_null())
                    .col(ColumnDef::new(ClassMembers::DeletedAt).timestamp_with_time_zone().null())
                    .col(ColumnDef::new(ClassMembers::Version).integer().not_null().default(1))
                    .to_owned(),
            )
            .await?;

        // 班级成员索引
        manager
            .create_index(
                Index::create()
                    .name("idx_class_members_class")
                    .table(ClassMembers::Table)
                    .col(ClassMembers::ClassId)
                    .to_owned(),
            )
            .await?;

        // 外键约束
        manager
            .create_foreign_key(
                ForeignKey::create()
                    .name("fk_class_members_class")
                    .from(ClassMembers::Table, ClassMembers::ClassId)
                    .to(super::m20260531_000173_create_school_classes::SchoolClasses::Table, super::m20260531_000173_create_school_classes::SchoolClasses::Id)
                    .on_delete(ForeignKeyAction::Cascade)
                    .to_owned(),
            )
            .await?;

        Ok(())
    }

    async fn down(&self, manager: &SchemaManager) -> Result<(), DbErr> {
        manager
            .drop_table(Table::drop().table(ClassMembers::Table).to_owned())
            .await
    }
}

#[derive(DeriveIden)]
enum ClassMembers {
    Table,
    ClassId,
    UserId,
    TenantId,
    Role,
    Nickname,
    JoinedAt,
    CreatedAt,
    UpdatedAt,
    CreatedBy,
    UpdatedBy,
    DeletedAt,
    Version,
}