mod git;

use std::fs::{create_dir_all, remove_file, write, File};
use std::io::{Error, ErrorKind::Other, Read, Result};
use std::path::Path;

use git::Git;

pub trait Remote {
    fn can_handle(&self, remote: &str) -> bool;
    fn sync_up(&self, remote: &str, directory: &Path) -> Result<()>;
    fn sync_down(&self, remote: &str, directory: &Path) -> Result<()>;
}

pub fn add(config_directory: &Path, remote_config: &Path, remote: &str) -> Result<()> {
    create_dir_all(config_directory)?;
    write(remote_config, remote)?;
    Ok(())
}

pub fn remove(remote_config: &Path) -> Result<()> {
    if remote_config.exists() {
        remove_file(remote_config)?;
    }
    Ok(())
}

pub fn sync_up(data_directory: &Path, remote_config: &Path) -> Result<()> {
    let remote_address =
        read_remote(remote_config).ok_or_else(|| Error::new(Other, "No remote is configured"))?;
    create_dir_all(data_directory)?;
    let remotes = available_remotes();
    for remote in remotes {
        if remote.can_handle(&remote_address) {
            return remote.sync_up(&remote_address, data_directory);
        }
    }
    Err(Error::new(
        Other,
        "No valid strategies found for your configured remote.",
    ))
}

pub fn sync_down(data_directory: &Path, remote_config: &Path) -> Result<()> {
    let remote_address =
        read_remote(remote_config).ok_or_else(|| Error::new(Other, "No remote is configured"))?;
    create_dir_all(data_directory)?;
    let remotes = available_remotes();
    for remote in remotes {
        if remote.can_handle(&remote_address) {
            return remote.sync_down(&remote_address, data_directory);
        }
    }
    Err(Error::new(
        Other,
        "No valid strategies found for your configured remote.",
    ))
}

fn available_remotes() -> Vec<Box<dyn Remote>> {
    vec![Box::new(Git::new())]
}

fn read_remote(file_path: &Path) -> Option<String> {
    let mut file = File::open(file_path).ok()?;
    let mut contents = String::new();
    file.read_to_string(&mut contents).ok()?;
    Some(contents)
}

#[cfg(test)]
mod tests {

    use super::*;

    use test_utilities::*;

    #[test]
    fn test_adds_a_remote() {
        let test_dir = setup_test_dir();
        let config_dir = test_dir.join("config");
        let remote_config = config_dir.join("remoteconfig");

        assert!(!&config_dir.exists());
        add(&config_dir, &remote_config, "whaaat").expect("Could not add a remote");
        assert!(&config_dir.exists());
        assert_file_contents(&remote_config, "whaaat");

        cleanup_test_dir(&test_dir);
    }

    #[test]
    fn test_removes_a_remote() {
        let test_dir = setup_test_dir();
        let remote_config = test_dir.join("remoteconfig");

        create_test_file(&remote_config, "remote control");

        assert_file_contents(&remote_config, "remote control");
        remove(&remote_config).expect("Could not remove a remote");
        assert!(!&remote_config.exists());

        cleanup_test_dir(&test_dir);
    }
}