//
use actix::prelude::*;

use tracing::{error, info};

use git_next_config as config;
use git_next_forge as forge;
use git_next_git as git;

use super::{LoadedConfig, RepoActor};

/// Loads the [RepoConfig] from the `.git-next.toml` file in the repository
#[tracing::instrument(skip_all, fields(branch = %repo_details.branch))]
pub async fn load_file(repo_details: git::RepoDetails, addr: Addr<RepoActor>, forge: forge::Forge) {
    info!("Loading .git-next.toml from repo");
    let repo_config = match load(&repo_details, &forge).await {
        Ok(repo_config) => repo_config,
        Err(err) => {
            error!(?err, "Failed to load config");
            return;
        }
    };
    info!("Loaded .git-next.toml from repo");
    addr.do_send(LoadedConfig(repo_config));
}

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

#[derive(Debug, derive_more::From, derive_more::Display)]
pub enum Error {
    File(git::file::Error),
    Config(config::server::Error),
    Toml(toml::de::Error),
    Forge(git::branch::Error),
    BranchNotFound(config::BranchName),
}

pub async fn validate(
    config: config::RepoConfig,
    forge: &forge::Forge,
) -> Result<config::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)
}