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use std::fs::File;
use std::path::Path;
use zstd::{Decoder, Encoder};

use petgraph::graph::DefaultIx;
use petgraph::graph::NodeIndex;
use petgraph::{Graph, Undirected};
use serde::{Deserialize, Serialize};

use anyhow::Result;

/// A book identifier with optional label used as a graph node.
#[derive(Serialize, Deserialize, Debug, Clone)]
pub struct BookID {
    pub code: i32,
    pub label: Option<String>,
    #[serde(default)]
    pub cluster: i32,
}

pub type IdGraph = Graph<BookID, (), Undirected>;
pub type IdNode = NodeIndex<DefaultIx>;

mod gml;
mod load;
mod sources;

pub use gml::save_gml;
pub use load::construct_graph;

/// Save a graph to a compressed, encoded file.
pub fn save_graph<P: AsRef<Path>>(graph: &IdGraph, path: P) -> Result<()> {
    let file = File::create(path)?;
    let mut out = Encoder::new(file, 6)?;
    // out.multithread(2)?;
    rmp_serde::encode::write(&mut out, &graph)?;
    out.finish()?;
    Ok(())
}

/// Load a graph from a compressed, encoded file.
pub fn load_graph<P: AsRef<Path>>(path: P) -> Result<IdGraph> {
    let file = File::open(path)?;
    let rdr = Decoder::new(file)?;
    let g = rmp_serde::decode::from_read(rdr)?;
    Ok(g)
}