backbone-bucket 0.2.0

//! Stats update service for Bucket
//!
//! This service handles updating statistics for buckets and user quotas
//! when files are created, updated, or deleted.

use anyhow::Result;

/// Stats update service
///
/// Provides methods to update bucket and user quota statistics
/// based on file operations.
pub struct StatsService {
    // Dependencies would be injected here:
    // bucket_repository: Arc<dyn BucketRepository>,
    // user_quota_repository: Arc<dyn UserQuotaRepository>,
}

impl StatsService {
    /// Create a new stats service
    pub fn new() -> Self {
        Self {}
    }

    /// Update stats when a file is created
    ///
    /// Increments bucket file_count and total_size_bytes.
    /// Increments user quota used_bytes and file_count.
    ///
    /// # Arguments
    /// * `bucket_id` - The bucket ID
    /// * `owner_id` - The file owner ID
    /// * `size_bytes` - The file size in bytes
    ///
    /// # Returns
    /// Ok(()) if stats were updated successfully
    pub async fn on_file_created(
        &self,
        bucket_id: uuid::Uuid,
        owner_id: uuid::Uuid,
        size_bytes: i64,
    ) -> Result<()> {
        tracing::info!(
            "Updating stats for file creation: bucket={}, owner={}, size={}",
            bucket_id,
            owner_id,
            size_bytes
        );

        // TODO: Update bucket stats
        // self.bucket_repository
        //     .update_stats(bucket_id, size_delta: size_bytes, count_delta: 1)
        //     .await?;

        // TODO: Update user quota stats
        // self.user_quota_repository
        //     .update_usage(owner_id, size_delta: size_bytes, count_delta: 1)
        //     .await?;

        Ok(())
    }

    /// Update stats when a file is deleted
    ///
    /// Decrements bucket file_count and total_size_bytes.
    /// Decrements user quota used_bytes and file_count.
    ///
    /// # Arguments
    /// * `bucket_id` - The bucket ID
    /// * `owner_id` - The file owner ID
    /// * `size_bytes` - The file size in bytes
    ///
    /// # Returns
    /// Ok(()) if stats were updated successfully
    pub async fn on_file_deleted(
        &self,
        bucket_id: uuid::Uuid,
        owner_id: uuid::Uuid,
        size_bytes: i64,
    ) -> Result<()> {
        tracing::info!(
            "Updating stats for file deletion: bucket={}, owner={}, size={}",
            bucket_id,
            owner_id,
            size_bytes
        );

        // TODO: Update bucket stats
        // self.bucket_repository
        //     .update_stats(bucket_id, size_delta: -size_bytes, count_delta: -1)
        //     .await?;

        // TODO: Update user quota stats
        // self.user_quota_repository
        //     .update_usage(owner_id, size_delta: -size_bytes, count_delta: -1)
        //     .await?;

        Ok(())
    }

    /// Update stats when a file is moved (size change)
    ///
    /// Updates bucket and user quota stats for size changes.
    ///
    /// # Arguments
    /// * `bucket_id` - The bucket ID
    /// * `owner_id` - The file owner ID
    /// * `old_size` - The original file size
    /// * `new_size` - The new file size
    ///
    /// # Returns
    /// Ok(()) if stats were updated successfully
    pub async fn on_file_size_changed(
        &self,
        bucket_id: uuid::Uuid,
        owner_id: uuid::Uuid,
        old_size: i64,
        new_size: i64,
    ) -> Result<()> {
        let delta = new_size - old_size;

        tracing::info!(
            "Updating stats for file size change: bucket={}, owner={}, delta={}",
            bucket_id,
            owner_id,
            delta
        );

        // TODO: Update bucket stats
        // self.bucket_repository
        //     .update_stats(bucket_id, size_delta: delta, count_delta: 0)
        //     .await?;

        // TODO: Update user quota stats
        // self.user_quota_repository
        //     .update_usage(owner_id, size_delta: delta, count_delta: 0)
        //     .await?;

        Ok(())
    }

    /// Update stats when a file is moved to a different bucket
    ///
    /// Decrements old bucket stats, increments new bucket stats.
    ///
    /// # Arguments
    /// * `old_bucket_id` - The original bucket ID
    /// * `new_bucket_id` - The new bucket ID
    /// * `size_bytes` - The file size in bytes
    ///
    /// # Returns
    /// Ok(()) if stats were updated successfully
    pub async fn on_file_moved(
        &self,
        old_bucket_id: uuid::Uuid,
        new_bucket_id: uuid::Uuid,
        size_bytes: i64,
    ) -> Result<()> {
        tracing::info!(
            "Updating stats for file move: old_bucket={}, new_bucket={}, size={}",
            old_bucket_id,
            new_bucket_id,
            size_bytes
        );

        // TODO: Update old bucket stats (decrease)
        // self.bucket_repository
        //     .update_stats(old_bucket_id, size_delta: -size_bytes, count_delta: -1)
        //     .await?;

        // TODO: Update new bucket stats (increase)
        // self.bucket_repository
        //     .update_stats(new_bucket_id, size_delta: size_bytes, count_delta: 1)
        //     .await?;

        Ok(())
    }

    /// Check if user has exceeded their quota
    ///
    /// # Arguments
    /// * `owner_id` - The user ID to check
    /// * `additional_bytes` - Additional bytes to add (for pending uploads)
    ///
    /// # Returns
    /// Ok(true) if quota is not exceeded, Ok(false) if exceeded
    pub async fn check_quota(
        &self,
        owner_id: uuid::Uuid,
        additional_bytes: i64,
    ) -> Result<bool> {
        tracing::info!(
            "Checking quota for user={}, additional={}",
            owner_id,
            additional_bytes
        );

        // TODO: Query user quota and check
        // let quota = self.user_quota_repository.find_by_user_id(owner_id).await?;
        // Ok(quota.used_bytes + additional_bytes <= quota.limit_bytes)

        // For now, return true (allow)
        Ok(true)
    }
}

impl Default for StatsService {
    fn default() -> Self {
        Self::new()
    }
}

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

    #[test]
    fn test_stats_service_creation() {
        let service = StatsService::new();
        // Service should be created successfully
        assert!(true);
    }
}