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use std::path::{Path, PathBuf};

use crate::Error;

struct AppDirs {
    data_dir: PathBuf,
    config_dir: PathBuf,
    cache_dir: PathBuf,
    log_dir: PathBuf,
    temporary_dir: PathBuf,
}

impl crate::AppDirs for AppDirs {
    fn new<P>(prefix: P) -> Result<Self, Error>
    where
        P: Into<PathBuf>,
    {
        let prefix = prefix.into();

        let data_dir = app_data_dir(&prefix);
        let cache_dir = app_cache_dir(&prefix);

        let user_dirs = Self {
            config_dir: data_dir.join("config"),
            temporary_dir: cache_dir.join("tmp"),
            log_dir: app_log_dir(&prefix),
            data_dir,
            cache_dir,
        };

        user_dirs.create()?;

        Ok(user_dirs)
    }

    fn create(&self) -> Result<(), Error> {
        let dirs = [
            self.data_dir(),
            self.config_dir(),
            self.cache_dir(),
            self.temporary_dir(),
            self.log_dir(),
        ];

        for dir in dirs.iter() {
            std::fs::create_dir_all(dir).map_err(|e| {
                Error::CreateDirectoryFailed(eieio::Error::from(e), dir.to_path_buf())
            })?;
        }
        // TODO: set tmp writable only by creator.

        Ok(())
    }

    fn data_dir(&self) -> &Path {
        &self.data_dir
    }

    fn config_dir(&self) -> &Path {
        &self.config_dir
    }

    fn cache_dir(&self) -> &Path {
        &self.cache_dir
    }

    fn log_dir(&self) -> &Path {
        &self.log_dir
    }

    fn temporary_dir(&self) -> &Path {
        &self.temporary_dir
    }
}

#[inline]
pub fn app_data_dir<P: AsRef<Path>>(prefix: P) -> PathBuf {
    PathBuf::from("/usr/share/").join(prefix)
}

#[inline]
pub fn app_config_dir<P: AsRef<Path>>(prefix: P) -> PathBuf {
    PathBuf::from("/etc/").join(prefix)
}

#[inline]
pub fn app_cache_dir<P: AsRef<Path>>(prefix: P) -> PathBuf {
    PathBuf::from("/var/cache/").join(prefix)
}

#[inline]
pub fn app_temporary_dir<P: AsRef<Path>>(prefix: P) -> PathBuf {
    PathBuf::from("/var/tmp/").join(prefix)
}

#[inline]
pub fn app_log_dir<P: AsRef<Path>>(prefix: P) -> PathBuf {
    PathBuf::from("/var/log/").join(prefix)
}