oxigdal-cloud 0.1.4

//! Google Cloud Storage backend with comprehensive features
//!
//! This module provides GCS integration with SDK support, object operations,
//! IAM authentication, bucket management, and signed URLs.

use bytes::Bytes;
use std::time::Duration;

use crate::auth::Credentials;
use crate::error::{CloudError, GcsError, Result};
use crate::retry::{RetryConfig, RetryExecutor};

use super::CloudStorageBackend;

/// GCS storage class
#[derive(Debug, Clone, Copy)]
pub enum GcsStorageClass {
    /// Standard storage
    Standard,
    /// Nearline storage
    Nearline,
    /// Coldline storage
    Coldline,
    /// Archive storage
    Archive,
}

/// Google Cloud Storage backend
#[derive(Debug, Clone)]
pub struct GcsBackend {
    /// GCS bucket name
    pub bucket: String,
    /// Object prefix (path within bucket)
    pub prefix: String,
    /// Project ID
    pub project_id: Option<String>,
    /// Storage class
    pub storage_class: GcsStorageClass,
    /// Request timeout
    pub timeout: Duration,
    /// Retry configuration
    pub retry_config: RetryConfig,
    /// Credentials
    pub credentials: Option<Credentials>,
}

impl GcsBackend {
    /// Creates a new GCS backend
    ///
    /// # Arguments
    /// * `bucket` - The GCS bucket name
    #[must_use]
    pub fn new(bucket: impl Into<String>) -> Self {
        Self {
            bucket: bucket.into(),
            prefix: String::new(),
            project_id: None,
            storage_class: GcsStorageClass::Standard,
            timeout: Duration::from_secs(300),
            retry_config: RetryConfig::default(),
            credentials: None,
        }
    }

    /// Sets the object prefix
    #[must_use]
    pub fn with_prefix(mut self, prefix: impl Into<String>) -> Self {
        self.prefix = prefix.into();
        self
    }

    /// Sets the project ID
    #[must_use]
    pub fn with_project_id(mut self, project_id: impl Into<String>) -> Self {
        self.project_id = Some(project_id.into());
        self
    }

    /// Sets storage class
    #[must_use]
    pub fn with_storage_class(mut self, storage_class: GcsStorageClass) -> Self {
        self.storage_class = storage_class;
        self
    }

    /// Sets request timeout
    #[must_use]
    pub fn with_timeout(mut self, timeout: Duration) -> Self {
        self.timeout = timeout;
        self
    }

    /// Sets retry configuration
    #[must_use]
    pub fn with_retry_config(mut self, config: RetryConfig) -> Self {
        self.retry_config = config;
        self
    }

    /// Sets credentials
    #[must_use]
    pub fn with_credentials(mut self, credentials: Credentials) -> Self {
        self.credentials = Some(credentials);
        self
    }

    fn full_object_name(&self, key: &str) -> String {
        if self.prefix.is_empty() {
            key.to_string()
        } else {
            format!("{}/{}", self.prefix, key)
        }
    }
}

// Note: google-cloud-storage crate provides Pure Rust implementation
// This is a placeholder for the actual GCS SDK integration

#[cfg(all(feature = "gcs", feature = "async"))]
#[async_trait::async_trait]
impl CloudStorageBackend for GcsBackend {
    async fn get(&self, key: &str) -> Result<Bytes> {
        let mut executor = RetryExecutor::new(self.retry_config.clone());

        executor
            .execute(|| async {
                let object_name = self.full_object_name(key);

                tracing::debug!("Getting GCS object: {}/{}", self.bucket, object_name);

                // Placeholder for GCS SDK integration
                Err(CloudError::Gcs(GcsError::Sdk {
                    message: "GCS SDK integration pending - requires google-cloud-storage setup"
                        .to_string(),
                }))
            })
            .await
    }

    async fn put(&self, key: &str, data: &[u8]) -> Result<()> {
        let mut executor = RetryExecutor::new(self.retry_config.clone());

        executor
            .execute(|| async {
                let object_name = self.full_object_name(key);

                tracing::debug!(
                    "Putting GCS object: {}/{} ({} bytes)",
                    self.bucket,
                    object_name,
                    data.len()
                );

                // Placeholder for GCS SDK integration
                Err(CloudError::Gcs(GcsError::Sdk {
                    message: "GCS SDK integration pending - requires google-cloud-storage setup"
                        .to_string(),
                }))
            })
            .await
    }

    async fn delete(&self, key: &str) -> Result<()> {
        let mut executor = RetryExecutor::new(self.retry_config.clone());

        executor
            .execute(|| async {
                let object_name = self.full_object_name(key);

                tracing::debug!("Deleting GCS object: {}/{}", self.bucket, object_name);

                // Placeholder for GCS SDK integration
                Err(CloudError::Gcs(GcsError::Sdk {
                    message: "GCS SDK integration pending - requires google-cloud-storage setup"
                        .to_string(),
                }))
            })
            .await
    }

    async fn exists(&self, key: &str) -> Result<bool> {
        let object_name = self.full_object_name(key);

        tracing::debug!(
            "Checking GCS object exists: {}/{}",
            self.bucket,
            object_name
        );

        // Placeholder for GCS SDK integration
        Err(CloudError::Gcs(GcsError::Sdk {
            message: "GCS SDK integration pending - requires google-cloud-storage setup"
                .to_string(),
        }))
    }

    async fn list_prefix(&self, prefix: &str) -> Result<Vec<String>> {
        let full_prefix = self.full_object_name(prefix);

        tracing::debug!(
            "Listing GCS objects: {} with prefix {}",
            self.bucket,
            full_prefix
        );

        // Placeholder for GCS SDK integration
        Err(CloudError::Gcs(GcsError::Sdk {
            message: "GCS SDK integration pending - requires google-cloud-storage setup"
                .to_string(),
        }))
    }

    fn is_readonly(&self) -> bool {
        false
    }
}

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

    #[test]
    fn test_gcs_backend_new() {
        let backend = GcsBackend::new("my-bucket");
        assert_eq!(backend.bucket, "my-bucket");
        assert_eq!(backend.prefix, "");
    }

    #[test]
    fn test_gcs_backend_builder() {
        let backend = GcsBackend::new("my-bucket")
            .with_prefix("data/objects")
            .with_project_id("my-project-123")
            .with_storage_class(GcsStorageClass::Coldline)
            .with_timeout(Duration::from_secs(600));

        assert_eq!(backend.prefix, "data/objects");
        assert_eq!(backend.project_id, Some("my-project-123".to_string()));
        assert!(matches!(backend.storage_class, GcsStorageClass::Coldline));
        assert_eq!(backend.timeout, Duration::from_secs(600));
    }

    #[test]
    fn test_gcs_backend_full_object_name() {
        let backend = GcsBackend::new("bucket").with_prefix("prefix");
        assert_eq!(backend.full_object_name("file.txt"), "prefix/file.txt");

        let backend_no_prefix = GcsBackend::new("bucket");
        assert_eq!(backend_no_prefix.full_object_name("file.txt"), "file.txt");
    }
}