mod config;
mod err;
mod fix;
mod lint;
mod traits;

use std::io;

use crate::{err::{StatixErr, FixErr, SingleFixErr}, traits::WriteDiagnostic};

use clap::Clap;
use config::{Opts, SubCommand};
use similar::TextDiff;

fn _main() -> Result<(), StatixErr> {
    let opts = Opts::parse();
    match opts.cmd {
        SubCommand::Check(check_config) => {
            let vfs = check_config.vfs()?;
            let (lints, errors): (Vec<_>, Vec<_>) = vfs.iter().map(lint::lint).partition(Result::is_ok);
            let lint_results = lints.into_iter().map(Result::unwrap);
            let errors = errors.into_iter().map(Result::unwrap_err);

            let mut stdout = io::stdout();
            lint_results.for_each(|r| {
                stdout.write(&r, &vfs, check_config.format).unwrap();
            });
            errors.for_each(|e| {
                eprintln!("{}", e);
            });
        },
        SubCommand::Fix(fix_config) => {
            let vfs = fix_config.vfs()?;
            for entry in vfs.iter() {
                if let Some(fix_result) = fix::all(entry.contents) {
                    if fix_config.diff_only {
                        let text_diff = TextDiff::from_lines(entry.contents, &fix_result.src);
                        let old_file = format!("{}", entry.file_path.display());
                        let new_file = format!("{} [fixed]", entry.file_path.display());
                        println!(
                            "{}",
                            text_diff
                            .unified_diff()
                            .context_radius(4)
                            .header(&old_file, &new_file)
                            );
                    } else {
                        let path = entry.file_path;
                        std::fs::write(path, &*fix_result.src).map_err(FixErr::InvalidPath)?;
                    }
                }
            }
        },
        SubCommand::Single(single_config) => {
            let path = single_config.target;
            let src = std::fs::read_to_string(&path).map_err(SingleFixErr::InvalidPath)?;
            let (line, col) = single_config.position;
            let single_result = fix::single(line, col, &src)?;
            std::fs::write(&path, &*single_result.src).map_err(SingleFixErr::InvalidPath)?;
        }
    }
    Ok(())
}

fn main() {
    match _main() {
        Err(e) => eprintln!("{}", e),
        _ => (),
    }
}