use std::fs::{create_dir_all, File};
use std::io::prelude::*;
use std::path::{Path, PathBuf};
use std::error::Error as STDError;

use serde::Serialize;
use toml;

use error::Error;
use logger::LogLevel;

pub fn add_to_beginning<T: Into<String>>(path: PathBuf, to_add: T) -> Result<PathBuf, Error> {
    if let (Some(parent), Some(file_name)) = (path.clone().parent(), path.clone().file_name()) {
        let parent = Path::new(&to_add.into()).join(parent);
        Ok(parent.join(file_name))
    } else {
        return Err(Error::new(
            LogLevel::SEVERE,
            format!("Could not find parent folder or file name for {:?}", path),
        ));
    }
}

pub fn write_toml<T: Serialize>(path: &PathBuf, data: &T, overwrite: bool) -> Result<(), Error> {
    match toml::ser::to_string(data) {
        Ok(text) => match write_file(&path, text, overwrite) {
            Ok(_) => Ok(()),
            Err(err) => Err(Error::new(
                LogLevel::SEVERE,
                format!(
                    "Failed to write {:?}: {}",
                    path,
                    err.description().to_owned()
                ),
            )),
        },
        Err(err) => Err(Error::new(
            LogLevel::SEVERE,
            format!(
                "Failed to serialize {:?}: {}",
                path,
                err.description().to_owned()
            ),
        )),
    }
}

pub fn write_file<T: Into<String>>(
    path: &PathBuf,
    content: T,
    overwrite: bool,
) -> Result<(), Error> {
    if let Some(parent) = path.clone().parent() {
        create_dir_all(parent.clone())?;
    } else {
        return Err(Error::new(
            LogLevel::SEVERE,
            format!("Could not find parent folder for {:?}", path),
        ));
    }

    let content = content.into();
    if path.exists() && !overwrite {
        Err(Error::new(
            LogLevel::SEVERE,
            format!(
                "File already exists: {:?} -- Consider using overwrite-flag",
                path
            ),
        ))
    } else {
        match File::create(path) {
            Ok(mut file) => Ok(file.write_all(content.as_bytes()).unwrap()),
            Err(err) => Err(Error::from(err)),
        }
    }
}