use sea_orm::{DatabaseConnection, EntityTrait};
use uuid::Uuid;

/// 解析触发者偏好的输出语言（BCP-47）。
///
/// 生产侧在入队时把语言写进任务，消费侧便无需再查用户表；查不到时返回 `None`，
/// 由 aihost 回退到 `[ai].output_language`。
pub async fn actor_language(db: &DatabaseConnection, actor_id: Option<Uuid>) -> Option<String> {
    use models::users::user;
    let uid = actor_id?;
    let row = user::Entity::find_by_id(uid).one(db).await.ok()??;
    let raw = row
        .language
        .as_deref()
        .filter(|value| !value.trim().is_empty())
        .or_else(|| {
            row.locale
                .as_deref()
                .filter(|value| !value.trim().is_empty())
        })?;
    let normalized = ci_protocol::ai_languages::normalize(raw);
    (!normalized.is_empty()).then_some(normalized)
}