use crate::node::Node;
use serde::{Deserialize, Serialize};
use time::OffsetDateTime;

#[derive(Debug, Clone, Eq, PartialEq, Serialize, Deserialize)]
pub struct DirectoryBuffer {
    pub parent: String,
    pub nodes: Vec<Node>,
    pub total: usize,
    pub focus: usize,

    #[serde(skip, default = "now")]
    pub explored_at: OffsetDateTime,
}

impl DirectoryBuffer {
    pub fn new(parent: String, nodes: Vec<Node>, focus: usize) -> Self {
        let total = nodes.len();
        Self {
            parent,
            nodes,
            total,
            focus,
            explored_at: now(),
        }
    }

    pub fn focused_node(&self) -> Option<&Node> {
        self.nodes.get(self.focus)
    }
}

fn now() -> OffsetDateTime {
    OffsetDateTime::now_local()
        .ok()
        .unwrap_or_else(OffsetDateTime::now_utc)
}