use async_trait::async_trait;

pub trait AiExecutionAttempt {
    fn execution_plan(&self) -> &aether_contracts::ExecutionPlan;

    fn report_kind(&self) -> Option<String>;

    fn report_context(&self) -> Option<serde_json::Value>;
}

#[derive(Debug)]
pub enum AiAttemptLoopOutcome<Response, Exhaustion> {
    Responded(Response),
    Exhausted(Exhaustion),
    NoPath,
}

#[async_trait]
pub trait AiAttemptLoopPort<Attempt>: Send + Sync
where
    Attempt: AiExecutionAttempt + Send + Sync + 'static,
{
    type Response: Send;
    type Exhaustion: Send;
    type Error: Send;

    async fn execute_attempt(
        &self,
        attempt: &Attempt,
    ) -> Result<Option<Self::Response>, Self::Error>;

    async fn mark_unused_attempts(&self, attempts: Vec<Attempt>) -> Result<(), Self::Error>;

    async fn build_exhaustion(
        &self,
        last_plan: aether_contracts::ExecutionPlan,
        last_report_context: Option<serde_json::Value>,
    ) -> Result<Self::Exhaustion, Self::Error>;
}

pub async fn run_ai_attempt_loop<Port, Attempt>(
    port: &Port,
    attempts: Vec<Attempt>,
) -> Result<AiAttemptLoopOutcome<Port::Response, Port::Exhaustion>, Port::Error>
where
    Port: AiAttemptLoopPort<Attempt>,
    Attempt: AiExecutionAttempt + Send + Sync + 'static,
{
    let mut remaining = attempts.into_iter();
    let mut last_attempted = None;

    while let Some(attempt) = remaining.next() {
        last_attempted = Some((attempt.execution_plan().clone(), attempt.report_context()));
        if let Some(response) = port.execute_attempt(&attempt).await? {
            port.mark_unused_attempts(remaining.collect()).await?;
            return Ok(AiAttemptLoopOutcome::Responded(response));
        }
    }

    let Some((last_plan, last_report_context)) = last_attempted else {
        return Ok(AiAttemptLoopOutcome::NoPath);
    };

    Ok(AiAttemptLoopOutcome::Exhausted(
        port.build_exhaustion(last_plan, last_report_context)
            .await?,
    ))
}

impl AiExecutionAttempt for crate::dto::AiSyncAttempt {
    fn execution_plan(&self) -> &aether_contracts::ExecutionPlan {
        &self.plan
    }

    fn report_kind(&self) -> Option<String> {
        self.report_kind.clone()
    }

    fn report_context(&self) -> Option<serde_json::Value> {
        self.report_context.clone()
    }
}

impl AiExecutionAttempt for crate::dto::AiStreamAttempt {
    fn execution_plan(&self) -> &aether_contracts::ExecutionPlan {
        &self.plan
    }

    fn report_kind(&self) -> Option<String> {
        self.report_kind.clone()
    }

    fn report_context(&self) -> Option<serde_json::Value> {
        self.report_context.clone()
    }
}