use git_next_config::{BranchName, RepoConfig};
use git_next_git::RepoDetails;
use terrors::OneOf;
use tracing::error;

use crate::gitforge::{self, ForgeFileError};

pub async fn load(
    details: &RepoDetails,
    forge: &gitforge::Forge,
) -> Result<RepoConfig, OneOf<(ForgeFileError, crate::config::Error, toml::de::Error, Error)>> {
    let contents = forge
        .file_contents_get(&details.branch, ".git-next.toml")
        .await
        .map_err(OneOf::new)?;
    let config = RepoConfig::load(&contents).map_err(OneOf::new)?;
    let config = validate(config, forge).await.map_err(OneOf::new)?;
    Ok(config)
}

#[derive(Debug)]
pub enum Error {
    Forge(gitforge::ForgeBranchError),
    BranchNotFound(BranchName),
}

pub async fn validate(config: RepoConfig, forge: &gitforge::Forge) -> Result<RepoConfig, Error> {
    let branches = forge.branches_get_all().await.map_err(|e| {
        error!(?e, "Failed to list branches");
        Error::Forge(e)
    })?;
    if !branches
        .iter()
        .any(|branch| branch == &config.branches().main())
    {
        return Err(Error::BranchNotFound(config.branches().main()));
    }
    if !branches
        .iter()
        .any(|branch| branch == &config.branches().next())
    {
        return Err(Error::BranchNotFound(config.branches().next()));
    }
    if !branches
        .iter()
        .any(|branch| branch == &config.branches().dev())
    {
        return Err(Error::BranchNotFound(config.branches().dev()));
    }
    Ok(config)
}