//! This library defines a binary format to store graph data such that
//! a client which understands the format can easily print the graph,
//! centered at any specific node, with any scope.  The library also
//! provides functions to print graphs in this format.
//!
//! This way, one does not need a server to print and interact with
//! graphs.
//!
//! # Graph representation
//!
//! The library uses the [`Graph`][graph::Graph] trait from the crate
//! [graph].  Only the functions exposed from the trait are used by
//! this library.  So the users can also implement the trait and then
//! print the graph data represented by other graph crates.

extern crate graph;

use graph::Graph;

use std::{error::Error, path::Path};

pub mod strong_component;

pub mod decycle;

pub trait Action: Sized {
    type Karmani: Graph;

    type Error: Error;

    fn perform(&self, obj: &mut Self::Karmani) -> Result<(), Self::Error>;

    fn serialize(&self) -> Vec<u8>;
    fn deserialize(bytes: impl AsRef<[u8]>) -> Result<Option<(Self, usize)>, Self::Error>;
}

#[allow(unused)]
pub fn serialize<A: Action>(
    actions: Vec<A>,
    filename: &Path,
    final_p: bool,
) -> Result<(), <A as Action>::Error> {
    Ok(())
}

pub fn deserialize<A: Action>(
    bytes: impl AsRef<[u8]>,
) -> Result<(Vec<A>, <A as Action>::Karmani), <A as Action>::Error> {
    let mut bytes = bytes.as_ref();

    let mut result_actions = Vec::new();
    let mut result_karmanayah = Default::default();

    while let Some((action, offset)) = A::deserialize(bytes)? {
        action.perform(&mut result_karmanayah)?;

        result_actions.push(action);

        bytes = &bytes[offset..];
    }

    let result = (result_actions, result_karmanayah);

    Ok(result)
}

// TODO: Figure out the parts to display graphs.