//
use git_next_core::{server, BranchName, RepoConfig};
use git_next_git::{self as git, repository::open::OpenRepositoryLike};

use std::path::PathBuf;

use derive_more::Display;
use tracing::info;

/// Loads the [RepoConfig] from the `.git-next.toml` file in the repository
#[tracing::instrument(skip_all, fields(branch = %repo_details.branch))]
pub async fn config_from_repository(
    repo_details: git::RepoDetails,
    open_repository: &dyn OpenRepositoryLike,
) -> Result<RepoConfig> {
    info!("Loading .git-next.toml from repo");
    let contents =
        open_repository.read_file(&repo_details.branch, &PathBuf::from(".git-next.toml"))?;
    let config = RepoConfig::parse(&contents)?;
    let branches = open_repository.remote_branches()?;
    required_branch(&config.branches().main(), &branches)?;
    required_branch(&config.branches().next(), &branches)?;
    required_branch(&config.branches().dev(), &branches)?;
    Ok(config)
}

fn required_branch(branch_name: &BranchName, branches: &[BranchName]) -> Result<()> {
    branches
        .iter()
        .find(|branch| *branch == branch_name)
        .ok_or_else(|| Error::BranchNotFound(branch_name.clone()))?;
    Ok(())
}

pub type Result<T> = core::result::Result<T, Error>;
#[derive(Debug, thiserror::Error, Display)]
pub enum Error {
    #[display("file")]
    File(#[from] git::file::Error),

    #[display("config")]
    Config(#[from] server::Error),

    #[display("toml")]
    Toml(#[from] toml::de::Error),

    #[display("push")]
    Push(#[from] git::push::Error),

    #[display("branch not found: {}", 0)]
    BranchNotFound(BranchName),
}