//! Wrappers for libgit2

pub mod log;
pub mod tree;

use git2::{self, Repository};
use log::CommitGraph;
use tree::Tree;

/// A top-level wrapper API for all libgit2 functions
pub struct Repo {
    inner: Repository,
    commits: Option<CommitGraph>,
    rev: Option<String>,
}

impl Repo {
    pub(crate) fn new(path: &str) -> Self {
        Self {
            inner: Repository::open(path).expect(&format!("`{}` is not a valid git repo", path)),
            commits: None,
            rev: None,
        }
    }

    pub(self) fn get_inner(&self) -> &Repository {
        &self.inner
    }

    pub(self) fn get_tree<'r>(&'r self, rev: &str) -> git2::Tree<'r> {
        self.inner
            .revparse_single(rev)
            .unwrap()
            .peel_to_tree()
            .unwrap()
    }

    pub(crate) fn clear_cache(&mut self) {
        self.rev = None;
        self.commits = None;
    }

    /// Load and cache commits for a specific rev
    pub(crate) fn load_commits(&mut self, rev: String) {
        self.rev = Some(rev.clone());
        self.commits = Some(log::create_commit_log(rev, &self));
    }

    /// Load the tree of files for the current rev
    ///
    /// Will fail if no rev was previously cached
    pub(crate) fn get_file_tree(&self) -> Tree {
        tree::parse_tree(
            self.get_tree(self.rev.as_ref().unwrap().as_str()),
            self.get_inner(),
        )
    }
}