use std::time::Duration;

use actix::prelude::*;

use tracing::{info, warn};

use crate::server::{
    actors::repo::{RepoActor, ValidateRepo},
    config, gitforge,
};

// advance next to the next commit towards the head of the dev branch
#[tracing::instrument(fields(next), skip_all)]
pub async fn advance_next(
    next: gitforge::Commit,
    dev_commit_history: Vec<gitforge::Commit>,
    repo_config: config::RepoConfig,
    forge: gitforge::Forge,
    addr: Addr<super::RepoActor>,
    message_token: super::MessageToken,
) {
    let next_commit = find_next_commit_on_dev(next, dev_commit_history);
    let Some(commit) = next_commit else {
        warn!("No commits to advance next to");
        return;
    };
    if let Some(problem) = validate_commit_message(commit.message()) {
        warn!("Can't advance next to commit '{}': {}", commit, problem);
        return;
    }
    info!("Advancing next to commit '{}'", commit);
    if let Err(err) = forge.branch_reset(
        repo_config.branches().next(),
        commit.into(),
        gitforge::Force::No,
    ) {
        warn!(?err, "Failed")
    }
    tokio::time::sleep(Duration::from_secs(10)).await;
    addr.do_send(ValidateRepo { message_token })
}

#[tracing::instrument]
fn validate_commit_message(message: &gitforge::Message) -> Option<String> {
    let message = &message.to_string();
    if message.to_ascii_lowercase().starts_with("wip") {
        return Some("Is Work-In-Progress".to_string());
    }
    match git_conventional::Commit::parse(message) {
        Ok(commit) => {
            info!(?commit, "Pass");
            None
        }
        Err(err) => {
            warn!(?err, "Fail");
            Some(err.kind().to_string())
        }
    }
}

fn find_next_commit_on_dev(
    next: gitforge::Commit,
    dev_commit_history: Vec<gitforge::Commit>,
) -> Option<gitforge::Commit> {
    let mut next_commit: Option<gitforge::Commit> = None;
    for commit in dev_commit_history.into_iter() {
        if commit == next {
            break;
        };
        next_commit.replace(commit);
    }
    next_commit
}

// advance main branch to the commit 'next'
#[tracing::instrument(fields(next), skip_all)]
pub async fn advance_main(
    next: gitforge::Commit,
    repo_config: config::RepoConfig,
    forge: gitforge::Forge,
    addr: Addr<RepoActor>,
    message_token: super::MessageToken,
) {
    info!("Advancing main to next");
    if let Err(err) = forge.branch_reset(
        repo_config.branches().main(),
        next.into(),
        gitforge::Force::No,
    ) {
        warn!(?err, "Failed")
    };
    addr.do_send(ValidateRepo { message_token })
}

#[cfg(test)]
mod tests {
    use super::*;

    #[actix_rt::test]
    async fn test_find_next_commit_on_dev() {
        let next = gitforge::Commit::new("current-next", "foo");
        let expected = gitforge::Commit::new("dev-next", "next-should-go-here");
        let dev_commit_history = vec![
            gitforge::Commit::new("dev", "future"),
            expected.clone(),
            next.clone(),
            gitforge::Commit::new("current-main", "history"),
        ];
        let next_commit = find_next_commit_on_dev(next, dev_commit_history);
        assert_eq!(next_commit, Some(expected));
    }
}