//! Approval management

use std::sync::Arc;
use serde_json::Value;
use zclaw_types::{Result, HandRun, HandRunId, HandRunStatus, TriggerSource};
use zclaw_hands::HandContext;

use super::Kernel;

impl Kernel {
    // ============================================================
    // Approval Management
    // ============================================================

    /// List pending approvals
    pub async fn list_approvals(&self) -> Vec<super::ApprovalEntry> {
        let approvals = self.pending_approvals.lock().await;
        approvals.iter().filter(|a| a.status == "pending").cloned().collect()
    }

    /// Get a single approval by ID (any status, not just pending)
    ///
    /// Returns None if no approval with the given ID exists.
    pub async fn get_approval(&self, id: &str) -> Option<super::ApprovalEntry> {
        let approvals = self.pending_approvals.lock().await;
        approvals.iter().find(|a| a.id == id).cloned()
    }

    /// Create a pending approval (called when a needs_approval hand is triggered)
    pub async fn create_approval(&self, hand_id: String, input: serde_json::Value) -> super::ApprovalEntry {
        let entry = super::ApprovalEntry {
            id: uuid::Uuid::new_v4().to_string(),
            hand_id,
            status: "pending".to_string(),
            created_at: chrono::Utc::now(),
            input,
            reject_reason: None,
        };
        let mut approvals = self.pending_approvals.lock().await;
        approvals.push(entry.clone());
        entry
    }

    /// Respond to an approval
    pub async fn respond_to_approval(
        &self,
        id: &str,
        approved: bool,
        reason: Option<String>,
    ) -> Result<()> {
        let mut approvals = self.pending_approvals.lock().await;
        let entry = approvals.iter_mut().find(|a| a.id == id && a.status == "pending")
            .ok_or_else(|| zclaw_types::ZclawError::NotFound(format!("Approval not found: {}", id)))?;

        entry.status = if approved { "approved".to_string() } else { "rejected".to_string() };
        if let Some(r) = reason {
            entry.reject_reason = Some(r);
        }

        if approved {
            let hand_id = entry.hand_id.clone();
            let input = entry.input.clone();
            drop(approvals); // Release lock before async hand execution

            // Execute the hand in background with HandRun tracking
            let hands = self.hands.clone();
            let approvals = self.pending_approvals.clone();
            let memory = self.memory.clone();
            let running_hand_runs = self.running_hand_runs.clone();
            let id_owned = id.to_string();
            tokio::spawn(async move {
                // Create HandRun record for tracking
                let run_id = HandRunId::new();
                let now = chrono::Utc::now().to_rfc3339();
                let mut run = HandRun {
                    id: run_id,
                    hand_name: hand_id.clone(),
                    trigger_source: TriggerSource::Manual,
                    params: input.clone(),
                    status: HandRunStatus::Pending,
                    result: None,
                    error: None,
                    duration_ms: None,
                    created_at: now.clone(),
                    started_at: None,
                    completed_at: None,
                };
                let _ = memory.save_hand_run(&run).await.map_err(|e| {
                    tracing::error!("[Approval] Failed to save hand run: {}", e);
                });
                run.status = HandRunStatus::Running;
                run.started_at = Some(chrono::Utc::now().to_rfc3339());
                let _ = memory.update_hand_run(&run).await.map_err(|e| {
                    tracing::error!("[Approval] Failed to update hand run (running): {}", e);
                });

                // Register cancellation flag
                let cancel_flag = Arc::new(std::sync::atomic::AtomicBool::new(false));
                running_hand_runs.insert(run.id, cancel_flag.clone());

                let context = HandContext::default();
                let start = std::time::Instant::now();
                let result = hands.execute(&hand_id, &context, input).await;
                let duration = start.elapsed();

                // Remove from running map
                running_hand_runs.remove(&run.id);

                // Update HandRun with result
                let completed_at = chrono::Utc::now().to_rfc3339();
                match &result {
                    Ok(res) => {
                        run.status = HandRunStatus::Completed;
                        run.result = Some(res.output.clone());
                        run.error = res.error.clone();
                    }
                    Err(e) => {
                        run.status = HandRunStatus::Failed;
                        run.error = Some(e.to_string());
                    }
                }
                run.duration_ms = Some(duration.as_millis() as u64);
                run.completed_at = Some(completed_at);
                let _ = memory.update_hand_run(&run).await.map_err(|e| {
                    tracing::error!("[Approval] Failed to update hand run (completed): {}", e);
                });

                // Update approval status based on execution result
                let mut approvals = approvals.lock().await;
                if let Some(entry) = approvals.iter_mut().find(|a| a.id == id_owned) {
                    match result {
                        Ok(_) => entry.status = "completed".to_string(),
                        Err(e) => {
                            entry.status = "failed".to_string();
                            if let Some(obj) = entry.input.as_object_mut() {
                                obj.insert("error".to_string(), Value::String(format!("{}", e)));
                            }
                        }
                    }
                }
            });
        }

        Ok(())
    }

    /// Cancel a pending approval
    pub async fn cancel_approval(&self, id: &str) -> Result<()> {
        let mut approvals = self.pending_approvals.lock().await;
        let entry = approvals.iter_mut().find(|a| a.id == id && a.status == "pending")
            .ok_or_else(|| zclaw_types::ZclawError::NotFound(format!("Approval not found: {}", id)))?;
        entry.status = "cancelled".to_string();
        Ok(())
    }
}