oxigdal-cloud 0.1.4

//! Azure Blob Storage backend with comprehensive features
//!
//! This module provides Azure Blob Storage integration with SDK support,
//! blob operations, SAS token support, container management, and hierarchical namespace.

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

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

use super::CloudStorageBackend;

/// Azure Blob Storage access tier
#[derive(Debug, Clone, Copy)]
pub enum AccessTier {
    /// Hot access tier
    Hot,
    /// Cool access tier
    Cool,
    /// Archive access tier
    Archive,
}

/// Azure Blob Storage backend
#[derive(Debug, Clone)]
pub struct AzureBlobBackend {
    /// Storage account name
    pub account_name: String,
    /// Container name
    pub container: String,
    /// Blob prefix (path within container)
    pub prefix: String,
    /// SAS token for authentication
    pub sas_token: Option<String>,
    /// Account key for authentication
    pub account_key: Option<String>,
    /// Access tier
    pub access_tier: AccessTier,
    /// Request timeout
    pub timeout: Duration,
    /// Retry configuration
    pub retry_config: RetryConfig,
    /// Credentials
    pub credentials: Option<Credentials>,
    /// Enable hierarchical namespace (Data Lake Gen2)
    pub hierarchical_namespace: bool,
}

impl AzureBlobBackend {
    /// Creates a new Azure Blob Storage backend
    ///
    /// # Arguments
    /// * `account_name` - The Azure storage account name
    /// * `container` - The container name
    #[must_use]
    pub fn new(account_name: impl Into<String>, container: impl Into<String>) -> Self {
        Self {
            account_name: account_name.into(),
            container: container.into(),
            prefix: String::new(),
            sas_token: None,
            account_key: None,
            access_tier: AccessTier::Hot,
            timeout: Duration::from_secs(300),
            retry_config: RetryConfig::default(),
            credentials: None,
            hierarchical_namespace: false,
        }
    }

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

    /// Sets SAS token authentication
    #[must_use]
    pub fn with_sas_token(mut self, token: impl Into<String>) -> Self {
        self.sas_token = Some(token.into());
        self
    }

    /// Sets account key authentication
    #[must_use]
    pub fn with_account_key(mut self, key: impl Into<String>) -> Self {
        self.account_key = Some(key.into());
        self
    }

    /// Sets access tier
    #[must_use]
    pub fn with_access_tier(mut self, tier: AccessTier) -> Self {
        self.access_tier = tier;
        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
    }

    /// Enables hierarchical namespace (Data Lake Gen2)
    #[must_use]
    pub fn with_hierarchical_namespace(mut self, enabled: bool) -> Self {
        self.hierarchical_namespace = enabled;
        self
    }

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

    /// Gets the blob endpoint URL
    fn get_blob_endpoint(&self) -> String {
        if self.hierarchical_namespace {
            format!("https://{}.dfs.core.windows.net", self.account_name)
        } else {
            format!("https://{}.blob.core.windows.net", self.account_name)
        }
    }
}

// Note: The azure_storage_blobs crate provides a Pure Rust implementation
// For this implementation, we'll create a simplified version that can be
// extended with the actual Azure SDK when the feature is enabled.

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

        executor
            .execute(|| async {
                let blob_name = self.full_blob_name(key);

                // In a real implementation, this would use azure_storage_blobs
                // For now, we'll return an error indicating the feature needs proper setup
                tracing::debug!(
                    "Getting blob: {}/{}/{}",
                    self.account_name,
                    self.container,
                    blob_name
                );

                // Placeholder for Azure SDK integration
                Err(CloudError::Azure(AzureError::Sdk {
                    message: "Azure SDK integration pending - requires azure_storage_blobs 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 blob_name = self.full_blob_name(key);

                tracing::debug!(
                    "Putting blob: {}/{}/{} ({} bytes)",
                    self.account_name,
                    self.container,
                    blob_name,
                    data.len()
                );

                // Placeholder for Azure SDK integration
                Err(CloudError::Azure(AzureError::Sdk {
                    message: "Azure SDK integration pending - requires azure_storage_blobs setup"
                        .to_string(),
                }))
            })
            .await
    }

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

        executor
            .execute(|| async {
                let blob_name = self.full_blob_name(key);

                tracing::debug!(
                    "Deleting blob: {}/{}/{}",
                    self.account_name,
                    self.container,
                    blob_name
                );

                // Placeholder for Azure SDK integration
                Err(CloudError::Azure(AzureError::Sdk {
                    message: "Azure SDK integration pending - requires azure_storage_blobs setup"
                        .to_string(),
                }))
            })
            .await
    }

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

        tracing::debug!(
            "Checking blob exists: {}/{}/{}",
            self.account_name,
            self.container,
            blob_name
        );

        // Placeholder for Azure SDK integration
        Err(CloudError::Azure(AzureError::Sdk {
            message: "Azure SDK integration pending - requires azure_storage_blobs setup"
                .to_string(),
        }))
    }

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

        tracing::debug!(
            "Listing blobs: {}/{} with prefix {}",
            self.account_name,
            self.container,
            full_prefix
        );

        // Placeholder for Azure SDK integration
        Err(CloudError::Azure(AzureError::Sdk {
            message: "Azure SDK integration pending - requires azure_storage_blobs setup"
                .to_string(),
        }))
    }

    fn is_readonly(&self) -> bool {
        // If only SAS token is provided, check if it has write permissions
        // For now, assume not readonly
        false
    }
}

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

    #[test]
    fn test_azure_backend_new() {
        let backend = AzureBlobBackend::new("myaccount", "mycontainer");
        assert_eq!(backend.account_name, "myaccount");
        assert_eq!(backend.container, "mycontainer");
        assert_eq!(backend.prefix, "");
    }

    #[test]
    fn test_azure_backend_builder() {
        let backend = AzureBlobBackend::new("myaccount", "mycontainer")
            .with_prefix("data/blobs")
            .with_sas_token("?sv=2020-08-04&ss=bfqt")
            .with_access_tier(AccessTier::Cool)
            .with_hierarchical_namespace(true)
            .with_timeout(Duration::from_secs(600));

        assert_eq!(backend.prefix, "data/blobs");
        assert!(backend.sas_token.is_some());
        assert!(matches!(backend.access_tier, AccessTier::Cool));
        assert!(backend.hierarchical_namespace);
        assert_eq!(backend.timeout, Duration::from_secs(600));
    }

    #[test]
    fn test_azure_backend_full_blob_name() {
        let backend = AzureBlobBackend::new("account", "container").with_prefix("prefix");
        assert_eq!(backend.full_blob_name("file.txt"), "prefix/file.txt");

        let backend_no_prefix = AzureBlobBackend::new("account", "container");
        assert_eq!(backend_no_prefix.full_blob_name("file.txt"), "file.txt");
    }

    #[test]
    fn test_azure_backend_blob_endpoint() {
        let backend = AzureBlobBackend::new("myaccount", "container");
        assert_eq!(
            backend.get_blob_endpoint(),
            "https://myaccount.blob.core.windows.net"
        );

        let backend_dfs = backend.with_hierarchical_namespace(true);
        assert_eq!(
            backend_dfs.get_blob_endpoint(),
            "https://myaccount.dfs.core.windows.net"
        );
    }
}