//
use std::path::Path;

use anyhow::{Context, Result};
use model::{Config, FoundMarkers, Line, Marker, MarkerKind};

mod model;

fn main() -> Result<()> {
    println!("Forgejo TODO Checker!");

    let config = Config::builder()
        .fs(kxio::fs::new(
            std::env::var("GITHUB_WORKSPACE")
                .context("GITHUB_WORKSPACE")?
                .into(),
        ))
        .repo(std::env::var("GITHUB_REPOSITORY").context("GITHUB_REPOSITORY")?)
        .server(std::env::var("GITHUB_SERVER_URL").context("GITHUB_SERVER_URL")?)
        .prefix_pattern(regex::Regex::new(r"(#|//)\s*(TODO|FIXME)").context("prefix regex")?)
        .issue_pattern(
            regex::Regex::new(r"( |)(\(|\(#)(?P<ISSUE_NUMBER>\d+)(\))").context("issue regex")?,
        )
        .maybe_auth_token(std::env::var("REPO_TOKEN").ok())
        .build();

    println!("Repo: {}", config.repo());
    println!("Prefix: {}", config.prefix_pattern());
    println!("Issues: {}", config.issue_pattern());

    let mut found_markers = FoundMarkers::default();

    for file in ignore::Walk::new(config.fs().base()).flatten() {
        let path = file.path();
        if config.fs().path_is_file(path)? {
            scan_file(path, &config, &mut found_markers)?;
        }
    }

    println!("{found_markers:?}");

    // TODO: add authentication when provided
    // let issues = ureq::get(&api).call()?.into_string()?;
    // TODO: parse issues to get list of open issue numbers

    // TODO: loop over list of expected issues and drop any where they do exist and are open
    // TODO: if remaining list is not empty - add all to error list
    //
    // TODO: if error list is empty - exit okay
    // TODO: if error list is not empty - log erros and exit not okay

    Ok(())
}

fn scan_file(file: &Path, config: &Config, found_markers: &mut FoundMarkers) -> Result<()> {
    println!("file: {}", file.to_string_lossy());
    config
        .fs()
        .file_read_to_string(file)?
        .lines()
        .enumerate()
        .filter_map(|(n, line)| prefix_match(n, line, file, config))
        .for_each(|marker| {
            println!("- {}", marker.line().value());
            if let Some(issue) = config
                .issue_pattern()
                .find(marker.line().value())
                .map(|issue| issue.as_str())
                .and_then(|issue| issue.parse::<usize>().ok())
            {
                found_markers.add_issue_marker(marker.into_issue_marker(issue));
            } else {
                found_markers.add_marker(marker);
            }
        });
    Ok(())
}

fn prefix_match(num: usize, line: &str, path: &Path, config: &Config) -> Option<Marker> {
    let find = config.prefix_pattern().find(line)?;
    let kind = match find.as_str() {
        "TODO" => Some(MarkerKind::Todo),
        "FIXME" => Some(MarkerKind::Fixme),
        _ => None,
    }?;
    Some(
        Marker::builder()
            .kind(kind)
            .file(path.to_path_buf())
            .line(Line::builder().num(num).value(line.to_owned()).build())
            .build(),
    )
}