use crate::config::CONFIG;
use serde_derive::{Serialize};
use chrono::{Utc, Duration};
use chrono_humanize::HumanTime;

pub fn get_commits(repo_name: String, ammount: usize, after: Option<String>) -> Option<Vec<Commits>> {
    let mut repo_path = CONFIG.git_location.clone();
    repo_path.push(format!("{}.git", repo_name));
    let repo = git2::Repository::open(repo_path).ok()?;
    let mut revwalk = repo.revwalk().ok()?;

    revwalk.set_sorting(git2::Sort::TIME).ok()?;
    match after {
        Some(id) => revwalk.push(git2::Oid::from_str(id.as_str()).ok()?).ok()?,
        None => revwalk.push_head().ok()?
    }
    let mut commits = Vec::new();
    let mut i = 0;
    let mut commit = revwalk.next();
    while i < ammount && commit.is_some() && commit.as_ref().unwrap().is_ok() {
        let commit_rev = commit.unwrap().unwrap();
        let repo_commit = repo.find_commit(commit_rev);
        match repo_commit {
            Ok(repo_commit) => {
                    let time = Duration::seconds(repo_commit.time().seconds() - Utc::now().timestamp());
                    commits.push(Commits {
                        commit_hash: commit_rev.to_string(),
                        commit: repo_commit.message().unwrap_or("").to_string(),
                        commitie: repo_commit.committer().name().unwrap_or("Unknown").to_string(),
                        commit_hash_short: commit_rev.to_string()[..8].to_string(),
                        time_utc: {
                            let date = chrono::naive::NaiveDateTime::from_timestamp(Utc::now().timestamp() + time.num_seconds(), 0);
                            format!("{} {} UTC", date.date().format("%Y-%m-%d"), date.time().format("%H:%M:%S"))
                        },
                        time_relitive: HumanTime::from(time).to_string(),
                    });
            },
            Err(_) => {}
        }
        i+=1;
        commit = revwalk.next();
    }
    Some(commits)
}

#[derive(Serialize)]
pub struct Commits {
    commit: String,
    commit_hash: String,
    commit_hash_short: String,
    commitie: String,
    time_utc: String,
    time_relitive: String
}