fraiseql-server 2.0.0-alpha.1

//! Elasticsearch backup provider.

use std::collections::HashMap;

use super::backup_provider::{BackupError, BackupInfo, BackupProvider, BackupResult, StorageUsage};

/// Elasticsearch backup provider.
///
/// Uses Elasticsearch snapshot/restore API.
#[allow(dead_code)]
pub struct ElasticsearchBackupProvider {
    /// Elasticsearch endpoint URL
    endpoint_url: String,
    /// Backup repository name
    repository:   String,
}

impl ElasticsearchBackupProvider {
    /// Create new Elasticsearch backup provider.
    pub fn new(endpoint_url: String, repository: String) -> Self {
        Self {
            endpoint_url,
            repository,
        }
    }

    fn generate_backup_id() -> String {
        let timestamp = std::time::SystemTime::now()
            .duration_since(std::time::UNIX_EPOCH)
            .map(|d| d.as_secs())
            .unwrap_or(0);
        format!("elasticsearch-{}", timestamp)
    }
}

#[async_trait::async_trait]
impl BackupProvider for ElasticsearchBackupProvider {
    fn name(&self) -> &'static str {
        "elasticsearch"
    }

    async fn health_check(&self) -> BackupResult<()> {
        // In production: GET _cluster/health
        Ok(())
    }

    async fn backup(&self) -> BackupResult<BackupInfo> {
        let backup_id = Self::generate_backup_id();

        // In production:
        // 1. Check repository configured: GET _snapshot/{repo}
        // 2. Trigger snapshot: PUT _snapshot/{repo}/{snap_name}
        // 3. Wait for completion: GET _snapshot/{repo}/{snap_name}
        // 4. Verify all shards successful

        Ok(BackupInfo {
            backup_id:   backup_id.clone(),
            store_name:  "elasticsearch".to_string(),
            timestamp:   std::time::SystemTime::now()
                .duration_since(std::time::UNIX_EPOCH)
                .map(|d| d.as_secs() as i64)
                .unwrap_or(0),
            size_bytes:  0,
            verified:    false,
            compression: None, // Elasticsearch snapshot handles compression
            metadata:    {
                let mut m = HashMap::new();
                m.insert("snapshot_id".to_string(), backup_id);
                m.insert("repository".to_string(), self.repository.clone());
                m
            },
        })
    }

    async fn restore(&self, backup_id: &str, verify: bool) -> BackupResult<()> {
        // In production:
        // 1. Trigger restore: POST _snapshot/{repo}/{snapshot_id}/_restore
        // 2. Wait for restore completion
        // 3. Verify indices and shards recovered
        if verify {
            self.verify_backup(backup_id).await?;
        }
        Ok(())
    }

    async fn list_backups(&self) -> BackupResult<Vec<BackupInfo>> {
        Ok(Vec::new())
    }

    async fn get_backup(&self, backup_id: &str) -> BackupResult<BackupInfo> {
        Err(BackupError::NotFound {
            store:     "elasticsearch".to_string(),
            backup_id: backup_id.to_string(),
        })
    }

    async fn delete_backup(&self, _backup_id: &str) -> BackupResult<()> {
        // In production: DELETE _snapshot/{repo}/{snapshot_id}
        Ok(())
    }

    async fn verify_backup(&self, _backup_id: &str) -> BackupResult<()> {
        // In production: GET _snapshot/{repo}/{snapshot_id} and check status
        Ok(())
    }

    async fn get_storage_usage(&self) -> BackupResult<StorageUsage> {
        Ok(StorageUsage {
            total_bytes:             0,
            backup_count:            0,
            oldest_backup_timestamp: None,
            newest_backup_timestamp: None,
        })
    }
}

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

    #[tokio::test]
    async fn test_elasticsearch_backup() {
        let provider = ElasticsearchBackupProvider::new(
            "http://localhost:9200".to_string(),
            "default".to_string(),
        );
        let backup = provider.backup().await.unwrap();
        assert_eq!(backup.store_name, "elasticsearch");
    }
}