//! Automated validation suite for environment variable namespace and precedence.

use nx9_wg_core::config::{AppConfig, BootstrapConfig};
use std::path::PathBuf;
use std::sync::Mutex;

static ENV_MUTEX: Mutex<()> = Mutex::new(());

#[test]
fn test_nx9_wg_env_variable_precedence_and_overrides() {
    let _lock = ENV_MUTEX.lock().unwrap();
    let mut config = AppConfig::default();

    // Set canonical NX9_WG_ environment variables
    unsafe {
        std::env::set_var("NX9_WG_CONFIG", "/custom/etc/config.toml");
        std::env::set_var("NX9_WG_DATA_DIR", "/custom/var/data");
        std::env::set_var("NX9_WG_LISTEN_ADDR", "127.0.0.1:9090");
        std::env::set_var("NX9_WG_LOG_LEVEL", "warn");
        std::env::set_var("NX9_WG_SESSION_TIMEOUT", "72");
        std::env::set_var("NX9_WG_RECONCILIATION_INTERVAL", "15");
        std::env::set_var("NX9_WG_BACKUP_DIR", "/custom/backups");
        std::env::set_var("NX9_WG_BACKUP_MAX_COUNT", "20");
        std::env::set_var("NX9_WG_BACKUP_SCHEDULE", "0 3 * * *");
        std::env::set_var("NX9_WG_ADMIN_USERNAME", "superadmin");
        std::env::set_var("NX9_WG_ADMIN_PASSWORD", "SuperSecretPW987!");
    }

    config.apply_env_overrides().expect("apply env overrides");

    assert_eq!(config.config_file, PathBuf::from("/custom/etc/config.toml"));
    assert_eq!(config.data_dir, PathBuf::from("/custom/var/data"));
    assert_eq!(config.bind_address, "127.0.0.1:9090".parse().unwrap());
    assert_eq!(config.log_level, "warn");
    assert_eq!(config.session_expiry_hours, 72);
    assert_eq!(config.reconciliation_interval_secs, 15);
    assert_eq!(config.backup.dir, PathBuf::from("/custom/backups"));
    assert_eq!(config.backup.max_count, 20);
    assert_eq!(config.backup.schedule, Some("0 3 * * *".to_string()));

    let boot = config.bootstrap.expect("bootstrap should be present");
    assert_eq!(boot.admin_username, Some("superadmin".to_string()));
    assert_eq!(boot.admin_password, Some("SuperSecretPW987!".to_string()));

    // Clean up
    unsafe {
        std::env::remove_var("NX9_WG_CONFIG");
        std::env::remove_var("NX9_WG_DATA_DIR");
        std::env::remove_var("NX9_WG_LISTEN_ADDR");
        std::env::remove_var("NX9_WG_LOG_LEVEL");
        std::env::remove_var("NX9_WG_SESSION_TIMEOUT");
        std::env::remove_var("NX9_WG_RECONCILIATION_INTERVAL");
        std::env::remove_var("NX9_WG_BACKUP_DIR");
        std::env::remove_var("NX9_WG_BACKUP_MAX_COUNT");
        std::env::remove_var("NX9_WG_BACKUP_SCHEDULE");
        std::env::remove_var("NX9_WG_ADMIN_USERNAME");
        std::env::remove_var("NX9_WG_ADMIN_PASSWORD");
    }
}

#[test]
fn test_invalid_env_variable_values() {
    let _lock = ENV_MUTEX.lock().unwrap();
    let mut config = AppConfig::default();
    unsafe {
        std::env::set_var("NX9_WG_LISTEN_ADDR", "invalid-ip-and-port");
    }
    assert!(config.apply_env_overrides().is_err());
    unsafe {
        std::env::remove_var("NX9_WG_LISTEN_ADDR");
    }

    unsafe {
        std::env::set_var("NX9_WG_SESSION_TIMEOUT", "not-a-number");
    }
    assert!(config.apply_env_overrides().is_err());
    unsafe {
        std::env::remove_var("NX9_WG_SESSION_TIMEOUT");
    }
}

#[test]
fn test_secret_redaction() {
    let boot = BootstrapConfig {
        admin_username: Some("admin".to_string()),
        admin_password: Some("secret12345".to_string()),
    };
    let formatted = format!("{boot:?}");
    assert!(!formatted.contains("secret12345"));
    assert!(formatted.contains("[REDACTED]"));
}

#[test]
fn test_database_path_resolution() {
    // Default database path should be data_dir/nx9-wg.db
    let config = AppConfig::default();
    let expected_db = config.data_dir.join("nx9-wg.db");
    assert_eq!(expected_db, PathBuf::from("/var/lib/nx9-wg/nx9-wg.db"));
}

#[test]
fn test_explicit_database_dir_override() {
    let _lock = ENV_MUTEX.lock().unwrap();
    let config = AppConfig::default();
    // When --database is explicitly provided, it should be used directly
    // The test verifies the default path is what we expect
    assert_eq!(config.data_dir, PathBuf::from("/var/lib/nx9-wg"));
}

#[test]
fn test_backup_directory_consistency() {
    let config = AppConfig::default();
    // Backup directory should always be consistent: /var/lib/nx9-wg/backups
    assert_eq!(config.backup.dir, PathBuf::from("/var/lib/nx9-wg/backups"));
}

#[test]
fn test_nx9_wg_database_env_var() {
    let _lock = ENV_MUTEX.lock().unwrap();
    // NX9_WG_DATABASE should be honored via CLI args
    // This test documents that the env var is in the canonical namespace
    let cli_args = &["--database", "/custom/path/test.db"];
    // We're verifying this is the correct pattern to use
    assert_eq!(cli_args[0], "--database");
    assert_eq!(cli_args[1], "/custom/path/test.db");
}

#[test]
fn test_canonical_env_namespace_only() {
    let _lock = ENV_MUTEX.lock().unwrap();
    // Verify only NX9_WG_* variables are used
    let mut config = AppConfig::default();

    // Try setting a non-canonical variable - should be ignored
    unsafe {
        std::env::set_var("RUST_LOG", "debug");
        std::env::set_var("NX9_LOG_LEVEL", "error");
    }

    config.apply_env_overrides().expect("apply env overrides");

    // These non-canonical variables should be ignored
    assert_eq!(config.log_level, "info"); // Should remain default

    // Clean up
    unsafe {
        std::env::remove_var("RUST_LOG");
        std::env::remove_var("NX9_LOG_LEVEL");
    }
}

#[test]
fn test_default_bind_address_is_localhost() {
    let config = AppConfig::default();
    // Verify bind address default
    assert_eq!(config.bind_address, "127.0.0.1:8080".parse().unwrap());
}

#[test]
fn test_default_reconciliation_interval() {
    let config = AppConfig::default();
    // Default reconciliation interval should be 60 seconds
    assert_eq!(config.reconciliation_interval_secs, 60);
}