use crate::config::Config;
use crate::error::{AppError, AppResult};
use crate::ip_service::IpService;
use clap::Parser;
use homedir::my_home;
use log::info;
use reqwest::ClientBuilder;
use std::path::PathBuf;
use std::process::exit;

mod config;
mod dyndns_service;
mod error;
mod ip_service;

#[cfg(test)]
mod test_macros;

#[derive(Parser, Debug)]
#[command(ignore_errors(true), version, about, long_about = None)]
struct Args {
    #[arg(short, long)]
    config_file: Option<PathBuf>,
}

impl Args {
    fn get_config_files(&self) -> Vec<PathBuf> {
        match self.config_file {
            Some(ref config_file) => vec![config_file.to_path_buf()],
            None => DefaultConfigFile::default().paths,
        }
    }
}

struct DefaultConfigFile {
    paths: Vec<PathBuf>,
}

impl DefaultConfigFile {
    fn user_home_config() -> AppResult<Option<PathBuf>> {
        let home = my_home().map_err(AppError::UnableToGetHomeDirectory)?;
        match home {
            None => Ok(None),
            Some(mut path) => {
                path.push(".config/multiwan-dyndns/config.json");
                Ok(Some(path))
            }
        }
    }
}
impl Default for DefaultConfigFile {
    fn default() -> Self {
        let mut paths = Vec::new();
        paths.push(PathBuf::from("/etc/multiwan-dyndns.json"));
        if let Some(user_home) = Self::user_home_config().unwrap() {
            paths.push(user_home);
        }
        Self { paths }
    }
}

#[tokio::main]
async fn main() {
    env_logger::init();

    let args = Args::parse();
    match run(args).await {
        Ok(_) => exit(0),
        Err(e) => {
            log::error!("{}", e);
            exit(1);
        }
    }
}

async fn run(args: Args) -> AppResult<()> {
    let config = Config::load(args.get_config_files())?;
    let client = ClientBuilder::new().build()?;
    for network in config.networks {
        let ip = network.ip_service.resolve(&client).await?;
        info!("{:?}: {}", network.interface, ip);
        // for dyndns in network.providers {
        //     DynDnsService::register(&dyndns, &ip)?;
        // }
    }

    Ok(())
}

#[cfg(test)]
mod tests {
    use super::*;
    use homedir::my_home;
    use std::ffi::OsString;
    use std::iter;
    use std::path::Path;

    macro_rules! assert_contains_config {
        ($config:expr, $expected:expr) => {
            assert!(
                $config.contains(&$expected.to_path_buf()),
                "Expected {} path {:?}\nActual paths: {:?}",
                stringify!($expected),
                $expected,
                $config
            );
        };
    }

    test! {
        fn verify_default_config_path_is_in_home_directory() {
            let args = Args::parse_from(iter::empty::<OsString>());

            let global_config = Path::new("/etc/multiwan-dyndns.json");
            let user_config_path = format!("{}/.config/multiwan-dyndns/config.json", my_home()?.unwrap().to_string_lossy());
            let user_config = Path::new(&user_config_path);

            let actual = args.get_config_files();
            assert_contains_config!(actual, user_config);
            assert_contains_config!(actual, global_config);
        }
    }

    #[tokio::test]
    async fn verify_it_actually_runs() {
        let args = vec!["multiwan-dyndns", "--config-file", "test/noop.json"];
        run(Args::parse_from(args)).await.expect("app didn't run!");
    }
}