reinhardt-rest 0.1.2

//! Global configuration system for API versioning
//!
//! Provides centralized configuration management for versioning strategies,
//! allowing applications to configure versioning behavior through settings.

use super::{
	AcceptHeaderVersioning, HostNameVersioning, NamespaceVersioning, QueryParameterVersioning,
	URLPathVersioning,
};
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::sync::Arc;

/// Global versioning configuration
#[non_exhaustive]
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct VersioningConfig {
	/// Default version to use when no version is specified
	pub default_version: String,

	/// Allowed versions (empty means any version is allowed)
	pub allowed_versions: Vec<String>,

	/// Versioning strategy configuration
	pub strategy: VersioningStrategy,

	/// Whether to raise errors for invalid versions
	pub strict_mode: bool,

	/// Custom version parameter name for query parameter versioning
	pub version_param: Option<String>,

	/// Custom hostname patterns for hostname versioning
	pub hostname_patterns: Option<HashMap<String, String>>,
}

impl Default for VersioningConfig {
	fn default() -> Self {
		Self {
			default_version: "1.0".to_string(),
			allowed_versions: vec![],
			strategy: VersioningStrategy::AcceptHeader,
			strict_mode: true,
			version_param: None,
			hostname_patterns: None,
		}
	}
}

/// Versioning strategy configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(tag = "type", content = "config")]
pub enum VersioningStrategy {
	/// Accept header versioning
	AcceptHeader,

	/// URL path versioning
	URLPath {
		/// URL pattern for version extraction (e.g., "/v{version}/")
		pattern: Option<String>,
	},

	/// Query parameter versioning
	QueryParameter {
		/// Parameter name (default: "version")
		param_name: Option<String>,
	},

	/// Hostname versioning
	HostName {
		/// Hostname patterns mapping versions to hostnames
		patterns: Option<HashMap<String, String>>,
	},

	/// Namespace versioning
	Namespace {
		/// Namespace pattern (e.g., "/v{version}/")
		pattern: Option<String>,
	},
}

impl VersioningConfig {
	/// Create a new versioning configuration
	pub fn new() -> Self {
		Self::default()
	}

	/// Set the default version
	pub fn with_default_version(mut self, version: impl Into<String>) -> Self {
		self.default_version = version.into();
		self
	}

	/// Set allowed versions
	pub fn with_allowed_versions(mut self, versions: Vec<String>) -> Self {
		self.allowed_versions = versions;
		self
	}

	/// Set versioning strategy
	pub fn with_strategy(mut self, strategy: VersioningStrategy) -> Self {
		self.strategy = strategy;
		self
	}

	/// Enable or disable strict mode
	pub fn with_strict_mode(mut self, strict: bool) -> Self {
		self.strict_mode = strict;
		self
	}

	/// Set custom version parameter name
	pub fn with_version_param(mut self, param: impl Into<String>) -> Self {
		self.version_param = Some(param.into());
		self
	}

	/// Set hostname patterns
	pub fn with_hostname_patterns(mut self, patterns: HashMap<String, String>) -> Self {
		self.hostname_patterns = Some(patterns);
		self
	}

	/// Create versioning instance from configuration
	pub fn create_versioning(&self) -> Box<dyn super::BaseVersioning + Send + Sync> {
		match &self.strategy {
			VersioningStrategy::AcceptHeader => {
				let mut versioning =
					AcceptHeaderVersioning::new().with_default_version(&self.default_version);

				if !self.allowed_versions.is_empty() {
					versioning = versioning.with_allowed_versions(self.allowed_versions.clone());
				}

				Box::new(versioning)
			}

			VersioningStrategy::URLPath { pattern } => {
				let mut versioning =
					URLPathVersioning::new().with_default_version(&self.default_version);

				if let Some(p) = pattern {
					versioning = versioning.with_pattern(p);
				}

				if !self.allowed_versions.is_empty() {
					versioning = versioning.with_allowed_versions(self.allowed_versions.clone());
				}

				Box::new(versioning)
			}

			VersioningStrategy::QueryParameter { param_name } => {
				let mut versioning =
					QueryParameterVersioning::new().with_default_version(&self.default_version);

				if let Some(name) = param_name {
					versioning = versioning.with_version_param(name);
				} else if let Some(name) = &self.version_param {
					versioning = versioning.with_version_param(name);
				}

				if !self.allowed_versions.is_empty() {
					versioning = versioning.with_allowed_versions(self.allowed_versions.clone());
				}

				Box::new(versioning)
			}

			VersioningStrategy::HostName { patterns } => {
				let mut versioning =
					HostNameVersioning::new().with_default_version(&self.default_version);

				if let Some(p) = patterns {
					for (version, hostname) in p {
						versioning = versioning.with_hostname_pattern(version, hostname);
					}
				} else if let Some(p) = &self.hostname_patterns {
					for (version, hostname) in p {
						versioning = versioning.with_hostname_pattern(version, hostname);
					}
				}

				if !self.allowed_versions.is_empty() {
					versioning = versioning.with_allowed_versions(self.allowed_versions.clone());
				}

				Box::new(versioning)
			}

			VersioningStrategy::Namespace { pattern } => {
				let mut versioning =
					NamespaceVersioning::new().with_default_version(&self.default_version);

				if let Some(p) = pattern {
					versioning = versioning.with_pattern(p);
				}

				if !self.allowed_versions.is_empty() {
					versioning = versioning.with_allowed_versions(self.allowed_versions.clone());
				}

				Box::new(versioning)
			}
		}
	}
}

impl From<super::settings::VersioningSettings> for VersioningConfig {
	fn from(settings: super::settings::VersioningSettings) -> Self {
		Self {
			default_version: settings.default_version,
			allowed_versions: settings.allowed_versions,
			strategy: settings.strategy,
			strict_mode: settings.strict_mode,
			version_param: settings.version_param,
			hostname_patterns: settings.hostname_patterns,
		}
	}
}

/// Global versioning manager
pub struct VersioningManager {
	config: VersioningConfig,
	versioning: Arc<dyn super::BaseVersioning + Send + Sync>,
}

impl std::fmt::Debug for VersioningManager {
	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
		f.debug_struct("VersioningManager")
			.field("config", &self.config)
			.field("versioning", &"<dyn BaseVersioning>")
			.finish()
	}
}

impl VersioningManager {
	/// Create a new versioning manager with configuration
	pub fn new(config: VersioningConfig) -> Self {
		let versioning = config.create_versioning();
		Self {
			config,
			versioning: Arc::from(versioning),
		}
	}

	/// Get the current configuration
	pub fn config(&self) -> &VersioningConfig {
		&self.config
	}

	/// Get the versioning instance
	pub fn versioning(&self) -> Arc<dyn super::BaseVersioning + Send + Sync> {
		self.versioning.clone()
	}

	/// Update configuration and recreate versioning instance
	pub fn update_config(&mut self, config: VersioningConfig) {
		self.config = config;
		self.versioning = Arc::from(self.config.create_versioning());
	}
}

impl Default for VersioningManager {
	fn default() -> Self {
		Self::new(VersioningConfig::default())
	}
}

#[cfg(test)]
mod tests {
	use super::*;
	use crate::versioning::settings::VersioningSettings;
	use std::collections::HashMap;

	#[test]
	fn test_versioning_config_default() {
		let config = VersioningConfig::default();
		assert_eq!(config.default_version, "1.0");
		assert!(config.allowed_versions.is_empty());
		assert!(matches!(config.strategy, VersioningStrategy::AcceptHeader));
		assert!(config.strict_mode);
	}

	#[test]
	fn test_versioning_config_builder() {
		let config = VersioningConfig::new()
			.with_default_version("2.0")
			.with_allowed_versions(vec!["2.0".to_string(), "3.0".to_string()])
			.with_strategy(VersioningStrategy::URLPath { pattern: None })
			.with_strict_mode(false);

		assert_eq!(config.default_version, "2.0");
		assert_eq!(config.allowed_versions, vec!["2.0", "3.0"]);
		assert!(matches!(
			config.strategy,
			VersioningStrategy::URLPath { .. }
		));
		assert!(!config.strict_mode);
	}

	#[test]
	fn test_versioning_strategy_serialization() {
		let strategy = VersioningStrategy::QueryParameter {
			param_name: Some("v".to_string()),
		};

		let json = serde_json::to_string(&strategy).unwrap();
		let deserialized: VersioningStrategy = serde_json::from_str(&json).unwrap();

		match deserialized {
			VersioningStrategy::QueryParameter { param_name } => {
				assert_eq!(param_name, Some("v".to_string()));
			}
			_ => panic!("Expected QueryParameter strategy"),
		}
	}

	#[test]
	fn test_versioning_manager_creation() {
		let config = VersioningConfig::new()
			.with_default_version("1.0")
			.with_strategy(VersioningStrategy::AcceptHeader);

		let manager = VersioningManager::new(config);
		assert_eq!(manager.config().default_version, "1.0");
	}

	#[tokio::test]
	async fn test_hostname_patterns() {
		let mut patterns = HashMap::new();
		patterns.insert("v1".to_string(), "v1.api.example.com".to_string());
		patterns.insert("v2".to_string(), "v2.api.example.com".to_string());

		let config = VersioningConfig::new().with_strategy(VersioningStrategy::HostName {
			patterns: Some(patterns.clone()),
		});

		let versioning = config.create_versioning();
		// The versioning instance should be created successfully
		assert!(
			versioning
				.determine_version(&crate::versioning::test_utils::create_test_request(
					"/",
					vec![]
				))
				.await
				.is_ok()
		);
	}

	// --------------------------------------------------------------------
	// Settings-based construction tests (replaces the prior `from_env`
	// tests, which exercised env-var parsing that no longer exists).
	// --------------------------------------------------------------------

	#[test]
	fn test_from_settings_default_values() {
		// Arrange
		let settings = VersioningSettings::default();

		// Act
		let config = VersioningConfig::from(settings);

		// Assert
		assert_eq!(config.default_version, "1.0");
		assert!(config.allowed_versions.is_empty());
		assert!(matches!(config.strategy, VersioningStrategy::AcceptHeader));
		assert!(config.strict_mode);
		assert!(config.version_param.is_none());
		assert!(config.hostname_patterns.is_none());
	}

	#[test]
	fn test_from_settings_custom_default_version() {
		// Arrange
		let settings = VersioningSettings {
			default_version: "2.0".to_string(),
			..VersioningSettings::default()
		};

		// Act
		let config = VersioningConfig::from(settings);

		// Assert
		assert_eq!(config.default_version, "2.0");
	}

	#[test]
	fn test_from_settings_allowed_versions() {
		// Arrange
		let settings = VersioningSettings {
			allowed_versions: vec!["1.0".to_string(), "2.0".to_string(), "3.0".to_string()],
			..VersioningSettings::default()
		};

		// Act
		let config = VersioningConfig::from(settings);

		// Assert
		assert_eq!(config.allowed_versions.len(), 3);
		assert!(config.allowed_versions.contains(&"1.0".to_string()));
		assert!(config.allowed_versions.contains(&"2.0".to_string()));
		assert!(config.allowed_versions.contains(&"3.0".to_string()));
	}

	#[test]
	fn test_from_settings_strategy_url_path() {
		// Arrange
		let settings = VersioningSettings {
			strategy: VersioningStrategy::URLPath { pattern: None },
			..VersioningSettings::default()
		};

		// Act
		let config = VersioningConfig::from(settings);

		// Assert
		assert!(matches!(
			config.strategy,
			VersioningStrategy::URLPath { .. }
		));
	}

	#[test]
	fn test_from_settings_strategy_query_parameter() {
		// Arrange
		let settings = VersioningSettings {
			strategy: VersioningStrategy::QueryParameter { param_name: None },
			..VersioningSettings::default()
		};

		// Act
		let config = VersioningConfig::from(settings);

		// Assert
		assert!(matches!(
			config.strategy,
			VersioningStrategy::QueryParameter { .. }
		));
	}

	#[test]
	fn test_from_settings_strategy_hostname() {
		// Arrange
		let settings = VersioningSettings {
			strategy: VersioningStrategy::HostName { patterns: None },
			..VersioningSettings::default()
		};

		// Act
		let config = VersioningConfig::from(settings);

		// Assert
		assert!(matches!(
			config.strategy,
			VersioningStrategy::HostName { .. }
		));
	}

	#[test]
	fn test_from_settings_strategy_namespace() {
		// Arrange
		let settings = VersioningSettings {
			strategy: VersioningStrategy::Namespace { pattern: None },
			..VersioningSettings::default()
		};

		// Act
		let config = VersioningConfig::from(settings);

		// Assert
		assert!(matches!(
			config.strategy,
			VersioningStrategy::Namespace { .. }
		));
	}

	#[test]
	fn test_from_settings_strict_mode_false() {
		// Arrange
		let settings = VersioningSettings {
			strict_mode: false,
			..VersioningSettings::default()
		};

		// Act
		let config = VersioningConfig::from(settings);

		// Assert
		assert!(!config.strict_mode);
	}

	#[test]
	fn test_from_settings_strict_mode_true_explicit() {
		// Arrange
		let settings = VersioningSettings {
			strict_mode: true,
			..VersioningSettings::default()
		};

		// Act
		let config = VersioningConfig::from(settings);

		// Assert
		assert!(config.strict_mode);
	}

	#[test]
	fn test_from_settings_combined() {
		// Arrange
		let settings = VersioningSettings {
			default_version: "3.0".to_string(),
			allowed_versions: vec!["2.0".to_string(), "3.0".to_string(), "4.0".to_string()],
			strategy: VersioningStrategy::URLPath { pattern: None },
			strict_mode: false,
			..VersioningSettings::default()
		};

		// Act
		let config = VersioningConfig::from(settings);

		// Assert
		assert_eq!(config.default_version, "3.0");
		assert_eq!(config.allowed_versions.len(), 3);
		assert!(matches!(
			config.strategy,
			VersioningStrategy::URLPath { .. }
		));
		assert!(!config.strict_mode);
	}

	#[test]
	fn test_from_settings_preserves_optional_fields() {
		// Arrange — exercise the path that previously was not covered by
		// the env-based tests (which always left these as None).
		let mut hostname_patterns = HashMap::new();
		hostname_patterns.insert("v1".to_string(), "v1.example.com".to_string());

		let settings = VersioningSettings {
			version_param: Some("v".to_string()),
			hostname_patterns: Some(hostname_patterns.clone()),
			..VersioningSettings::default()
		};

		// Act
		let config = VersioningConfig::from(settings);

		// Assert
		assert_eq!(config.version_param.as_deref(), Some("v"));
		assert_eq!(config.hostname_patterns.as_ref().map(|p| p.len()), Some(1));
	}
}