use std::ops::Deref;

use git_next_config::BranchName;
use secrecy::ExposeSecret;
use tracing::{info, warn};

use super::{GitRef, RepoDetails, Repository};

#[derive(Debug)]
pub enum Force {
    No,
    From(GitRef),
}
impl std::fmt::Display for Force {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Self::No => write!(f, "fast-foward"),
            Self::From(from) => write!(f, "force-if-from:{}", from),
        }
    }
}

// TODO: (#72) reimplement using `gix`
#[tracing::instrument(skip_all, fields(branch = %branch_name, to = %to_commit, force = %force))]
pub fn reset(
    repository: &Repository,
    repo_details: &RepoDetails,
    branch_name: BranchName,
    to_commit: GitRef,
    force: Force,
) -> Result {
    let origin = repo_details.origin();
    let force = match force {
        Force::No => "".to_string(),
        Force::From(old_ref) => format!("--force-with-lease={branch_name}:{old_ref}"),
    };
    // INFO: never log the command as it contains the API token within the 'origin'
    let command: secrecy::Secret<String> = format!(
        "/usr/bin/git push {} {to_commit}:{branch_name} {force}",
        origin.expose_secret()
    )
    .into();
    let ctx = gix::diff::command::Context {
        git_dir: Some(repository.deref().git_dir().to_path_buf()),
        ..Default::default()
    };
    match gix::command::prepare(command.expose_secret())
        .with_context(ctx)
        .with_shell_allow_argument_splitting()
        .stdout(std::process::Stdio::null())
        .stderr(std::process::Stdio::null())
        .spawn()
    {
        Ok(mut child) => match child.wait() {
            Ok(_) => {
                info!("Branch updated");
                Ok(())
            }
            Err(err) => {
                warn!(?err, "Failed (wait)");
                Err(BranchResetError::Push)
            }
        },
        Err(err) => {
            warn!(?err, "Failed (spawn)");
            Err(BranchResetError::Push)
        }
    }
}

#[derive(Debug, derive_more::From, derive_more::Display)]
pub enum BranchResetError {
    Open(Box<gix::open::Error>),
    Fetch(super::fetch::Error),
    Push,
}
impl std::error::Error for BranchResetError {}

pub type Result = core::result::Result<(), BranchResetError>;