mod checker;
mod config;
mod fetcher;
mod state;
mod verifier;

use anyhow::Result;
use std::path::Path;

/// First iteration: check -> fetch -> verify -> report, for whatever is
/// in packages.d/. No build/publish step yet (see SPEC.md > Status).
fn main() -> Result<()> {
    let client = reqwest::blocking::Client::builder()
        .user_agent("pkgwatch/0.1 (PoC; https://code.austinschaefer.com)")
        .build()?;

    let packages_dir = Path::new("packages.d");
    let state_dir = Path::new("state");
    let work_dir = Path::new("work");

    let packages = config::load_packages_dir(packages_dir)?;
    if packages.is_empty() {
        println!("no packages configured under {}/", packages_dir.display());
        return Ok(());
    }

    for (name, pkg) in packages {
        println!("== {name} ({}) ==", pkg.repo);

        let latest = checker::latest_github_release(&client, &pkg.repo)?;
        let last_seen = state::load_last_version(state_dir, &name);

        if last_seen.as_deref() == Some(latest.as_str()) {
            println!("  up to date at {latest}");
            continue;
        }

        println!("  new version detected: {latest} (previously: {last_seen:?})");

        let dest_dir = work_dir.join(&name).join(&latest);
        let artifact_path =
            fetcher::download_asset(&client, &pkg.repo, &latest, &pkg.asset_pattern, &dest_dir)?;
        println!("  fetched {}", artifact_path.display());

        let result = verifier::verify(
            &client,
            &pkg.verification,
            &pkg.repo,
            &latest,
            &artifact_path,
            &dest_dir,
        )?;

        println!(
            "  verification (tier {}): {} — {}",
            result.tier,
            if result.passed { "PASS" } else { "FAIL" },
            result.justification
        );

        match (result.tier, result.passed) {
            (1..=3, true) => {
                println!("  tier 1-3 pass: would auto-build + publish (not yet implemented)");
                state::save_last_version(state_dir, &name, &latest)?;
            }
            (_, true) => {
                println!("  tier 4-6 pass: flagging for human review, not auto-publishing");
                println!(
                    "  (review-queue persistence not yet implemented — this is where it plugs in)"
                );
            }
            (_, false) => {
                println!("  verification failed — not publishing, not updating state");
            }
        }
    }

    Ok(())
}