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(Messages::Table)
                    .if_not_exists()
                    .col(
                        ColumnDef::new(Messages::Id)
                            .uuid()
                            .not_null()
                            .primary_key(),
                    )
                    .col(ColumnDef::new(Messages::TenantId).uuid().not_null())
                    .col(ColumnDef::new(Messages::TemplateId).uuid().null())
                    .col(ColumnDef::new(Messages::SenderId).uuid().null())
                    .col(
                        ColumnDef::new(Messages::SenderType)
                            .string()
                            .not_null()
                            .default("system"),
                    )
                    .col(ColumnDef::new(Messages::RecipientId).uuid().not_null())
                    .col(
                        ColumnDef::new(Messages::RecipientType)
                            .string()
                            .not_null()
                            .default("user"),
                    )
                    .col(ColumnDef::new(Messages::Title).string().not_null())
                    .col(ColumnDef::new(Messages::Body).text().not_null())
                    .col(
                        ColumnDef::new(Messages::Priority)
                            .string()
                            .not_null()
                            .default("normal"),
                    )
                    .col(ColumnDef::new(Messages::BusinessType).string().null())
                    .col(ColumnDef::new(Messages::BusinessId).uuid().null())
                    .col(
                        ColumnDef::new(Messages::IsRead)
                            .boolean()
                            .not_null()
                            .default(false),
                    )
                    .col(ColumnDef::new(Messages::ReadAt).timestamp_with_time_zone().null())
                    .col(
                        ColumnDef::new(Messages::IsArchived)
                            .boolean()
                            .not_null()
                            .default(false),
                    )
                    .col(ColumnDef::new(Messages::ArchivedAt).timestamp_with_time_zone().null())
                    .col(ColumnDef::new(Messages::SentAt).timestamp_with_time_zone().null())
                    .col(
                        ColumnDef::new(Messages::Status)
                            .string()
                            .not_null()
                            .default("sent"),
                    )
                    .col(ColumnDef::new(Messages::CreatedAt).timestamp_with_time_zone().not_null())
                    .col(ColumnDef::new(Messages::UpdatedAt).timestamp_with_time_zone().not_null())
                    .col(ColumnDef::new(Messages::CreatedBy).uuid().not_null())
                    .col(ColumnDef::new(Messages::UpdatedBy).uuid().not_null())
                    .col(ColumnDef::new(Messages::DeletedAt).timestamp_with_time_zone().null())
                    .to_owned(),
            )
            .await?;

        manager.get_connection().execute(sea_orm::Statement::from_string(
            sea_orm::DatabaseBackend::Postgres,
            "CREATE INDEX idx_messages_tenant_recipient ON messages (tenant_id, recipient_id) WHERE deleted_at IS NULL".to_string(),
        )).await.map_err(|e| DbErr::Custom(e.to_string()))?;

        manager.get_connection().execute(sea_orm::Statement::from_string(
            sea_orm::DatabaseBackend::Postgres,
            "CREATE INDEX idx_messages_tenant_recipient_unread ON messages (tenant_id, recipient_id) WHERE deleted_at IS NULL AND is_read = false".to_string(),
        )).await.map_err(|e| DbErr::Custom(e.to_string()))?;

        manager.get_connection().execute(sea_orm::Statement::from_string(
            sea_orm::DatabaseBackend::Postgres,
            "CREATE INDEX idx_messages_tenant_business ON messages (tenant_id, business_type, business_id) WHERE deleted_at IS NULL".to_string(),
        )).await.map_err(|e| DbErr::Custom(e.to_string()))?;

        manager
            .create_foreign_key(
                ForeignKey::create()
                    .name("fk_messages_template")
                    .from(Messages::Table, Messages::TemplateId)
                    .to(MessageTemplates::Table, MessageTemplates::Id)
                    .to_owned(),
            )
            .await?;

        Ok(())
    }

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

#[derive(DeriveIden)]
enum Messages {
    Table,
    Id,
    TenantId,
    TemplateId,
    SenderId,
    SenderType,
    RecipientId,
    RecipientType,
    Title,
    Body,
    Priority,
    BusinessType,
    BusinessId,
    IsRead,
    ReadAt,
    IsArchived,
    ArchivedAt,
    SentAt,
    Status,
    CreatedAt,
    UpdatedAt,
    CreatedBy,
    UpdatedBy,
    DeletedAt,
}

#[derive(DeriveIden)]
enum MessageTemplates {
    Table,
    Id,
}