athena_rs 3.3.0

//! Postgres client bootstrap: config targets, catalog merge planning, and merge reporting.
//!
//! Keeps connection orchestration testable without running the full `build_shared_state` stack.

use std::collections::HashSet;

use crate::config::Config;
use crate::data::clients::AthenaClientRecord;
use crate::drivers::postgresql::pool_manager::ConnectionPoolManager;
use crate::drivers::postgresql::sqlx_driver::{
    ClientConnectionTarget, PostgresClientRegistry, normalize_postgres_client_key,
};
use crate::parser::{parse_env_reference, resolve_postgres_uri};

/// Counters for [`merge_catalog_targets_into_registry`].
#[derive(Debug, Clone, Default, PartialEq, Eq)]
pub struct PostgresCatalogMergeReport {
    pub inactive_or_frozen: usize,
    pub already_connected: usize,
    pub skipped_prior_config_failure: usize,
    pub upsert_succeeded: usize,
    pub upsert_failed: usize,
}

/// Decides how a single catalog row should be handled before any async work.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum CatalogClientStep {
    InactiveOrFrozen,
    AlreadyConnected,
    SkipDueToPriorConfigFailure,
    LoadFromCatalog,
}

/// Build [`ClientConnectionTarget`] entries from `config.postgres_clients` (same rules as server bootstrap).
pub fn client_connection_targets_from_config(config: &Config) -> Vec<ClientConnectionTarget> {
    config
        .postgres_clients
        .iter()
        .flat_map(|map| {
            map.iter().map(|(key, uri)| ClientConnectionTarget {
                client_name: key.clone(),
                source: "config".to_string(),
                description: None,
                pg_uri: parse_env_reference(uri)
                    .is_none()
                    .then(|| resolve_postgres_uri(uri)),
                pg_uri_env_var: parse_env_reference(uri),
                config_uri_template: Some(uri.clone()),
                is_active: true,
                is_frozen: false,
            })
        })
        .collect()
}

/// `(client_name, resolved_uri)` pairs used by [`PostgresClientRegistry::from_entries`].
pub fn postgres_registry_entries_from_targets(
    targets: &[ClientConnectionTarget],
) -> Vec<(String, String)> {
    targets
        .iter()
        .filter_map(|target| {
            let uri = target
                .config_uri_template
                .as_ref()
                .map(|value| resolve_postgres_uri(value))
                .or_else(|| target.pg_uri.clone());
            uri.map(|uri| (target.client_name.clone(), uri))
        })
        .collect()
}

/// Keys for clients that failed during config-time pool creation (trim + lowercase).
pub fn failed_config_keys_from_errors(errors: &[(String, anyhow::Error)]) -> HashSet<String> {
    errors
        .iter()
        .map(|(name, _)| normalize_postgres_client_key(name))
        .collect()
}

/// Pure planning step for unit tests and for documenting merge behavior.
pub fn plan_catalog_client_step(
    target: &ClientConnectionTarget,
    has_pool: bool,
    failed_config_keys: &HashSet<String>,
) -> CatalogClientStep {
    if !target.is_active || target.is_frozen {
        return CatalogClientStep::InactiveOrFrozen;
    }
    if has_pool {
        return CatalogClientStep::AlreadyConnected;
    }
    if failed_config_keys.contains(&normalize_postgres_client_key(&target.client_name)) {
        return CatalogClientStep::SkipDueToPriorConfigFailure;
    }
    CatalogClientStep::LoadFromCatalog
}

fn target_from_athena_record(record: &AthenaClientRecord) -> ClientConnectionTarget {
    ClientConnectionTarget {
        client_name: record.client_name.clone(),
        source: record.source.clone(),
        description: record.description.clone(),
        pg_uri: record.pg_uri.clone(),
        pg_uri_env_var: record.pg_uri_env_var.clone(),
        config_uri_template: record.config_uri_template.clone(),
        is_active: record.is_active,
        is_frozen: record.is_frozen,
    }
}

/// Applies catalog rows to the registry: inactive handling, dedupe of config failures, then `upsert_client` for the rest.
pub async fn merge_catalog_targets_into_registry(
    registry: &PostgresClientRegistry,
    targets: Vec<ClientConnectionTarget>,
    failed_config_keys: &HashSet<String>,
) -> PostgresCatalogMergeReport {
    let mut report = PostgresCatalogMergeReport::default();

    for target in targets {
        let has_pool = registry.get_pool(&target.client_name).is_some();
        match plan_catalog_client_step(&target, has_pool, failed_config_keys) {
            CatalogClientStep::InactiveOrFrozen => {
                registry.remember_client(target.clone(), false);
                registry.mark_unavailable(&target.client_name);
                report.inactive_or_frozen += 1;
            }
            CatalogClientStep::AlreadyConnected => {
                registry.remember_client(target, true);
                report.already_connected += 1;
            }
            CatalogClientStep::SkipDueToPriorConfigFailure => {
                registry.remember_client(target.clone(), false);
                registry.mark_unavailable(&target.client_name);
                report.skipped_prior_config_failure += 1;
            }
            CatalogClientStep::LoadFromCatalog => {
                if let Err(err) = registry.upsert_client(target.clone()).await {
                    tracing::warn!(
                        client = %target.client_name,
                        error = %err,
                        "Failed to load database-backed client into local registry"
                    );
                    registry.remember_client(target, false);
                    report.upsert_failed += 1;
                } else {
                    report.upsert_succeeded += 1;
                }
            }
        }
    }

    tracing::info!(
        inactive_or_frozen = report.inactive_or_frozen,
        already_connected = report.already_connected,
        skipped_prior_config_failure = report.skipped_prior_config_failure,
        upsert_succeeded = report.upsert_succeeded,
        upsert_failed = report.upsert_failed,
        "Postgres catalog merge complete"
    );

    report
}

/// Converts `athena_clients` rows and merges them (used by server bootstrap).
pub async fn merge_athena_clients_from_records(
    registry: &PostgresClientRegistry,
    records: Vec<AthenaClientRecord>,
    failed_config_keys: &HashSet<String>,
) -> PostgresCatalogMergeReport {
    let targets: Vec<ClientConnectionTarget> =
        records.iter().map(target_from_athena_record).collect();
    merge_catalog_targets_into_registry(registry, targets, failed_config_keys).await
}

fn parse_bool_env(value: Option<String>, default: bool) -> bool {
    value
        .as_deref()
        .map(|raw| {
            let normalized = raw.trim().to_ascii_lowercase();
            matches!(normalized.as_str(), "1" | "true" | "yes" | "on")
        })
        .unwrap_or(default)
}

/// Builds the same [`ConnectionPoolManager`] used at server startup (env-driven).
pub fn connection_pool_manager_from_env() -> ConnectionPoolManager {
    let pool_max_lifetime_secs: u64 = std::env::var("ATHENA_PG_POOL_MAX_LIFETIME_SECS")
        .ok()
        .and_then(|v| v.parse().ok())
        .unwrap_or(900);

    let pool_test_before_acquire: bool = parse_bool_env(
        std::env::var("ATHENA_PG_POOL_TEST_BEFORE_ACQUIRE").ok(),
        true,
    );

    ConnectionPoolManager::new(crate::client::config::PoolConfig {
        max_connections: std::env::var("ATHENA_PG_POOL_MAX_CONNECTIONS")
            .ok()
            .and_then(|v| v.parse().ok())
            .unwrap_or(50),
        min_connections: std::env::var("ATHENA_PG_POOL_MIN_CONNECTIONS")
            .ok()
            .and_then(|v| v.parse().ok())
            .unwrap_or(0),
        connection_timeout: std::time::Duration::from_secs(
            std::env::var("ATHENA_PG_POOL_ACQUIRE_TIMEOUT_SECS")
                .ok()
                .and_then(|v| v.parse().ok())
                .unwrap_or(8),
        ),
        idle_timeout: std::time::Duration::from_secs(
            std::env::var("ATHENA_PG_POOL_IDLE_TIMEOUT_SECS")
                .ok()
                .and_then(|v| v.parse().ok())
                .unwrap_or(120),
        ),
    })
    .with_max_lifetime(std::time::Duration::from_secs(pool_max_lifetime_secs))
    .with_test_before_acquire(pool_test_before_acquire)
}

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

    fn sample_target(name: &str, active: bool, frozen: bool) -> ClientConnectionTarget {
        ClientConnectionTarget {
            client_name: name.to_string(),
            source: "db".to_string(),
            description: None,
            pg_uri: Some("postgres://localhost/db".to_string()),
            pg_uri_env_var: None,
            config_uri_template: None,
            is_active: active,
            is_frozen: frozen,
        }
    }

    #[test]
    fn plan_inactive() {
        let t = sample_target("x", false, false);
        assert_eq!(
            plan_catalog_client_step(&t, false, &HashSet::new()),
            CatalogClientStep::InactiveOrFrozen
        );
    }

    #[test]
    fn plan_frozen() {
        let t = sample_target("x", true, true);
        assert_eq!(
            plan_catalog_client_step(&t, false, &HashSet::new()),
            CatalogClientStep::InactiveOrFrozen
        );
    }

    #[test]
    fn plan_already_connected() {
        let t = sample_target("x", true, false);
        assert_eq!(
            plan_catalog_client_step(&t, true, &HashSet::new()),
            CatalogClientStep::AlreadyConnected
        );
    }

    #[test]
    fn plan_skip_prior_config_failure() {
        let t = sample_target("Railway_XBP", true, false);
        let mut keys: HashSet<String> = HashSet::new();
        keys.insert("railway_xbp".to_string());
        assert_eq!(
            plan_catalog_client_step(&t, false, &keys),
            CatalogClientStep::SkipDueToPriorConfigFailure
        );
    }

    #[test]
    fn plan_load_from_catalog() {
        let t = sample_target("neon_only", true, false);
        assert_eq!(
            plan_catalog_client_step(&t, false, &HashSet::new()),
            CatalogClientStep::LoadFromCatalog
        );
    }

    #[test]
    fn failed_config_keys_normalizes() {
        let errors: Vec<(String, anyhow::Error)> = vec![
            ("  Spaced  ".to_string(), anyhow::anyhow!("e")),
            ("UPPER".to_string(), anyhow::anyhow!("e")),
        ];
        let keys: HashSet<String> = failed_config_keys_from_errors(&errors);
        assert!(keys.contains("spaced"));
        assert!(keys.contains("upper"));
    }

    #[test]
    fn client_targets_from_minimal_yaml_config() {
        let yaml = r#"
urls: []
hosts: []
api: []
authenticator: []
postgres_clients:
  - alpha: "postgres://u:p@localhost:5432/alpha"
  - beta: "${POSTGRES_BETA_URI}"
gateway: []
backup: []
"#;
        let config: Config = serde_yaml::from_str(yaml).expect("parse config");
        let targets = client_connection_targets_from_config(&config);
        assert_eq!(targets.len(), 2);
        let alpha = targets.iter().find(|t| t.client_name == "alpha").unwrap();
        assert_eq!(alpha.source, "config");
        assert!(alpha.pg_uri.is_some());
        assert!(alpha.pg_uri_env_var.is_none());
        let beta = targets.iter().find(|t| t.client_name == "beta").unwrap();
        assert_eq!(beta.pg_uri_env_var.as_deref(), Some("POSTGRES_BETA_URI"));
        assert!(beta.pg_uri.is_none());
    }

    #[test]
    fn registry_entries_resolve_config_uris() {
        let yaml = r#"
urls: []
hosts: []
api: []
authenticator: []
postgres_clients:
  - gamma: "postgres://user:pass@host:5432/dbname"
gateway: []
backup: []
"#;
        let config: Config = serde_yaml::from_str(yaml).expect("parse config");
        let targets = client_connection_targets_from_config(&config);
        let pairs = postgres_registry_entries_from_targets(&targets);
        assert_eq!(pairs.len(), 1);
        assert_eq!(pairs[0].0, "gamma");
        assert!(pairs[0].1.contains("host:5432"));
    }

    #[tokio::test]
    async fn merge_athena_records_equivalent_to_targets() {
        use chrono::Utc;
        use uuid::Uuid;

        let record = AthenaClientRecord {
            id: Uuid::nil().to_string(),
            client_name: "merge_via_record".to_string(),
            description: None,
            pg_uri: Some("postgres://127.0.0.1:1/nope".to_string()),
            pg_uri_env_var: None,
            config_uri_template: None,
            source: "test".to_string(),
            is_active: true,
            is_frozen: false,
            last_synced_from_config_at: None,
            last_seen_at: None,
            metadata: serde_json::json!({}),
            created_at: Utc::now(),
            updated_at: Utc::now(),
            deleted_at: None,
        };

        let pool_manager = connection_pool_manager_from_env();
        let (registry, _) = PostgresClientRegistry::from_entries(vec![], pool_manager)
            .await
            .expect("registry");
        let report =
            merge_athena_clients_from_records(&registry, vec![record], &HashSet::new()).await;
        assert_eq!(report.upsert_failed, 1);
    }

    #[test]
    fn connection_pool_manager_from_env_builds() {
        let _mgr = connection_pool_manager_from_env();
    }
}