//! Sync queue processor with retry logic and exponential backoff
//!
//! This is a placeholder implementation. Full implementation will be added
//! when the reporter is integrated. Dead code warnings are suppressed.

#![allow(dead_code)]
#![allow(unused_imports)]

use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::Arc;
use std::time::Duration;
use tokio::sync::Mutex as TokioMutex;

use crate::jellyfin::client::JellyfinClient;
use crate::repository::MediaRepository;
use crate::storage::db_service::RusqliteService;

/// Configuration for sync processor
pub struct SyncConfig {
    pub max_retries: u32,         // 5
    pub base_retry_delay_ms: u64, // 1000ms
    pub batch_size: usize,        // 10 items
}

impl Default for SyncConfig {
    fn default() -> Self {
        Self {
            max_retries: 5,
            base_retry_delay_ms: 1000,
            batch_size: 10,
        }
    }
}

/// Sync queue processor that handles retry logic with exponential backoff
///
/// This is a placeholder implementation. Full implementation will be added
/// in a subsequent task following the plan.
pub struct SyncProcessor {
    _db_service: Arc<RusqliteService>,
    _jellyfin_client: Arc<TokioMutex<Option<JellyfinClient>>>,
    _repository: Arc<dyn MediaRepository>,
    _processing: Arc<TokioMutex<bool>>,
    _cancelled: Arc<AtomicBool>,
    _config: SyncConfig,
}

impl SyncProcessor {
    /// Creates a new SyncProcessor
    pub fn new(
        db_service: Arc<RusqliteService>,
        jellyfin_client: Arc<TokioMutex<Option<JellyfinClient>>>,
        repository: Arc<dyn MediaRepository>,
    ) -> Self {
        Self {
            _db_service: db_service,
            _jellyfin_client: jellyfin_client,
            _repository: repository,
            _processing: Arc::new(TokioMutex::new(false)),
            _cancelled: Arc::new(AtomicBool::new(false)),
            _config: SyncConfig::default(),
        }
    }

    /// Starts the sync processor
    pub async fn start(&self) -> Result<(), String> {
        log::info!("[SyncProcessor] Started (placeholder implementation)");
        // TODO: Implement full processor logic
        Ok(())
    }

    /// Stops the sync processor
    pub async fn stop(&self) -> Result<(), String> {
        log::info!("[SyncProcessor] Stopped (placeholder implementation)");
        // TODO: Implement stop logic
        Ok(())
    }

    /// Processes the sync queue once
    pub async fn process_queue(&self) -> Result<(), String> {
        log::debug!("[SyncProcessor] Processing queue (placeholder)");
        // TODO: Implement queue processing
        Ok(())
    }

    /// Calculates exponential backoff delay
    fn _calculate_backoff(&self, retry_count: u32) -> Duration {
        let delay_ms = self._config.base_retry_delay_ms * 2_u64.pow(retry_count);
        let max_delay_ms = 10_000; // 10 seconds max
        Duration::from_millis(delay_ms.min(max_delay_ms))
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_sync_config_default() {
        let config = SyncConfig::default();
        assert_eq!(config.max_retries, 5);
        assert_eq!(config.base_retry_delay_ms, 1000);
        assert_eq!(config.batch_size, 10);
    }

    // TODO: Re-enable when SyncProcessor is fully implemented
    // #[test]
    // fn test_calculate_backoff() {
    //     let config = SyncConfig::default();
    //     let processor = SyncProcessor {
    //         _db_service: Arc::new(unsafe { std::mem::zeroed() }),  // Placeholder for test
    //         _jellyfin_client: Arc::new(TokioMutex::new(None)),
    //         _repository: Arc::new(unsafe { std::mem::zeroed() }),  // Placeholder for test
    //         _processing: Arc::new(TokioMutex::new(false)),
    //         _cancelled: Arc::new(AtomicBool::new(false)),
    //         _config: config,
    //     };
    //
    //     // Test exponential backoff: 1s, 2s, 4s, 8s, 10s (capped)
    //     assert_eq!(processor._calculate_backoff(0), Duration::from_millis(1000));
    //     assert_eq!(processor._calculate_backoff(1), Duration::from_millis(2000));
    //     assert_eq!(processor._calculate_backoff(2), Duration::from_millis(4000));
    //     assert_eq!(processor._calculate_backoff(3), Duration::from_millis(8000));
    //     assert_eq!(processor._calculate_backoff(4), Duration::from_millis(10000)); // capped
    //     assert_eq!(processor._calculate_backoff(5), Duration::from_millis(10000)); // capped
    // }
}
