// 主题布置表

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(TopicAssignments::Table)
                    .if_not_exists()
                    .col(ColumnDef::new(TopicAssignments::Id).uuid().not_null().primary_key())
                    .col(ColumnDef::new(TopicAssignments::TenantId).uuid().not_null())
                    .col(ColumnDef::new(TopicAssignments::ClassId).uuid().not_null())
                    .col(ColumnDef::new(TopicAssignments::TeacherId).uuid().not_null())
                    .col(ColumnDef::new(TopicAssignments::Title).string().not_null())
                    .col(ColumnDef::new(TopicAssignments::Description).text().null())
                    .col(ColumnDef::new(TopicAssignments::DueDate).date().null())
                    .col(ColumnDef::new(TopicAssignments::IsActive).boolean().not_null().default(true))
                    .col(
                        ColumnDef::new(TopicAssignments::CreatedAt)
                            .timestamp_with_time_zone()
                            .not_null()
                            .default(Expr::current_timestamp()),
                    )
                    .col(
                        ColumnDef::new(TopicAssignments::UpdatedAt)
                            .timestamp_with_time_zone()
                            .not_null()
                            .default(Expr::current_timestamp()),
                    )
                    .col(ColumnDef::new(TopicAssignments::CreatedBy).uuid().not_null())
                    .col(ColumnDef::new(TopicAssignments::UpdatedBy).uuid().not_null())
                    .col(ColumnDef::new(TopicAssignments::DeletedAt).timestamp_with_time_zone().null())
                    .col(ColumnDef::new(TopicAssignments::Version).integer().not_null().default(1))
                    .to_owned(),
            )
            .await?;

        // 班级 + 激活状态索引
        manager
            .create_index(
                Index::create()
                    .name("idx_topic_assignments_class_active")
                    .table(TopicAssignments::Table)
                    .col(TopicAssignments::ClassId)
                    .col(TopicAssignments::IsActive)
                    .to_owned(),
            )
            .await?;

        // 外键约束
        manager
            .create_foreign_key(
                ForeignKey::create()
                    .name("fk_topic_assignments_class")
                    .from(TopicAssignments::Table, TopicAssignments::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(TopicAssignments::Table).to_owned())
            .await
    }
}

#[derive(DeriveIden)]
enum TopicAssignments {
    Table,
    Id,
    TenantId,
    ClassId,
    TeacherId,
    Title,
    Description,
    DueDate,
    IsActive,
    CreatedAt,
    UpdatedAt,
    CreatedBy,
    UpdatedBy,
    DeletedAt,
    Version,
}