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extern crate uuid;

use uuid::Uuid;


/// Edge is a connection between two nodes in the graph
/// 
/// Src is the innovation number of the node sending input through the network
/// dst is the innovation number of the node receiving the input from the src neuron
/// innov is the edge's unique innovation number for crossover and mutation
/// weight is the weight of the connection
/// active keeps track of if this edge is active or not, meaning it will be used 
/// while feeding data through the network
#[derive(Deserialize, Serialize, Debug, Clone, PartialEq)]
pub struct Edge {
    pub src: Uuid,
    pub dst: Uuid, 
    pub innov: Uuid,
    pub weight: f32,
    pub active: bool
}


impl Edge {

    pub fn new(src: Uuid, dst: Uuid, innov: Uuid, weight: f32, active: bool) -> Self {
        Edge { 
            src,    
            dst, 
            innov, 
            weight, 
            active 
        }
    }



    /// update the weight of this edge connection
    #[inline]
    pub fn update(&mut self, delta: f32) {
        self.weight += delta;
    }


    /// calculate the eligibility of this connection and store it for time series predictions
    #[inline]
    pub fn calculate(&mut self, val: f32) -> f32 {
        val * self.weight
	}
}