//! Component parameter serialization
//!
//! Provides types for extracting and serializing component-specific parameters.

use serde::{Deserialize, Serialize};
use std::collections::HashMap;

/// Serializable component parameters
///
/// This type captures all component-specific configuration in a flexible format
/// that can be serialized to JSON and later used to reconstruct components.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct ComponentParams {
    /// Component type (e.g., "Compressor", "Condenser", "ExpansionValve")
    pub component_type: String,
    /// Component-specific parameters as key-value pairs
    #[serde(flatten)]
    pub params: HashMap<String, serde_json::Value>,
}

impl ComponentParams {
    /// Create a new ComponentParams for a given component type
    pub fn new(component_type: impl Into<String>) -> Self {
        Self {
            component_type: component_type.into(),
            params: HashMap::new(),
        }
    }

    /// Add a parameter
    pub fn with_param(
        mut self,
        key: impl Into<String>,
        value: impl Into<serde_json::Value>,
    ) -> Self {
        self.params.insert(key.into(), value.into());
        self
    }

    /// Get a parameter value
    pub fn get(&self, key: &str) -> Option<&serde_json::Value> {
        self.params.get(key)
    }

    /// Check if component is of a specific type
    pub fn is_type(&self, component_type: &str) -> bool {
        self.component_type == component_type
    }
}

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

    #[test]
    fn test_component_params_creation() {
        let params = ComponentParams::new("Compressor")
            .with_param("m1", 0.85)
            .with_param("m2", 2.5)
            .with_param("fluid", "R134a");

        assert_eq!(params.component_type, "Compressor");
        assert_eq!(params.get("m1"), Some(&json!(0.85)));
        assert_eq!(params.get("fluid"), Some(&json!("R134a")));
        assert!(params.is_type("Compressor"));
        assert!(!params.is_type("Condenser"));
    }

    #[test]
    fn test_component_params_serialization() {
        let params = ComponentParams::new("TestComponent")
            .with_param("value1", 42)
            .with_param("value2", "test");

        let json = serde_json::to_string(&params).unwrap();
        let deserialized: ComponentParams = serde_json::from_str(&json).unwrap();

        assert_eq!(params, deserialized);
    }
}