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// Copyright (C) 2022 Leandro Lisboa Penz <lpenz@lpenz.org>
// This file is subject to the terms and conditions defined in
// file 'LICENSE', which is part of this source code package.

//! Top level file processing function.

use anyhow::Result;
use std::path;
use tracing::event;
use tracing::instrument;
use tracing::Level;

use crate::cmd::OutputFormat;
use crate::proxy;
use crate::workflow::Workflow;

/// Process the provided file.
/// Returns true if any outdated entities were found, false otherwise.
#[instrument(level="info", fields(filename = ?filename.as_ref().display()))]
pub async fn process_file(
    dryrun: bool,
    output_format: OutputFormat,
    proxy_server: &proxy::Server,
    filename: impl AsRef<path::Path>,
) -> Result<bool> {
    let filename = filename.as_ref();
    let mut workflow = match Workflow::new(filename).await {
        Ok(entities) => entities,
        Err(e) => {
            event!(
                Level::ERROR,
                error = ?e,
                filename = ?filename,
            );
            return Err(e);
        }
    };
    workflow.fetch_latest_versions(proxy_server).await;
    let dryrunmsg = if dryrun { " (dryrun)" } else { "" };
    let mut any_outdated = false;
    for (resource, current_version) in &workflow.uses {
        if let Some(latest_version) = workflow.latest.get(resource) {
            if current_version == latest_version {
                continue;
            }
            any_outdated = true;
            match output_format {
                OutputFormat::Standard => {
                    println!(
                        "{}: update {} from {} to {}{}",
                        filename.display(),
                        resource,
                        current_version,
                        latest_version,
                        dryrunmsg
                    );
                }
                OutputFormat::GithubWarning => {
                    println!(
                        "::warning file={}::update {} from {} to {}",
                        filename.display(),
                        resource,
                        current_version,
                        latest_version,
                    );
                }
            }
        }
    }
    if !dryrun {
        match workflow.update_file().await {
            Ok(true) => {
                event!(
                    Level::INFO,
                    filename = ?filename,
                    "updated"
                );
            }
            Ok(false) => {
                event!(
                    Level::INFO,
                    filename = ?filename,
                    "unchanged"
                );
            }
            Err(e) => {
                event!(
                    Level::ERROR,
                    error = ?e,
                    filename = ?filename,
                    "error writing updated file"
                );
            }
        }
    }
    Ok(any_outdated)
}