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use super::*;

/// A mount point
#[derive(Debug, Clone)]
pub struct Mount {
    pub info: MountInfo,
    pub fs_label: Option<String>,
    pub disk: Option<Disk>,
    pub stats: Option<Stats>,
}

impl Mount {
    pub fn size(&self) -> u64 {
        self.stats.as_ref().map_or(0, |s| s.size())
    }
}

/// read all the mount points and load basic information on them
pub fn read_mounts() -> Result<Vec<Mount>> {
    let labels = read_labels().ok();
    // we'll find the disk for a filesystem by taking the longest
    // disk whose name starts the one of our partition
    // hence the sorting.
    let bd_list = BlockDeviceList::read()?;
    read_mountinfo()?
        .drain(..)
        .map(|info| {
            let top_bd = bd_list.find_top(
                info.dev,
                info.dm_name(),
                info.fs_name(),
            );
            let fs_label = labels.as_ref()
                .and_then(|labels| {
                    labels
                        .iter()
                        .find(|label| label.fs_name == info.fs)
                        .map(|label| label.label.clone())
                });
            let disk = top_bd.map(|bd| Disk::new(bd.name.clone()));
            let stats = Stats::from(&info.mount_point)?;
            Ok(Mount { info, fs_label, disk, stats })
        })
        .collect()
}