//
use derive_more::Display;
use std::path::PathBuf;
use tracing::info;

use git_next_config as config;
use git_next_git as git;

/// 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 git::repository::OpenRepositoryLike,
) -> Result<config::RepoConfig> {
    info!("Loading .git-next.toml from repo");
    let contents =
        open_repository.read_file(&repo_details.branch, &PathBuf::from(".git-next.toml"))?;
    let config = 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: &config::BranchName,
    branches: &[config::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] config::server::Error),

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

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

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