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//! The delete roller.
//!
//! Requires the `delete_roller` feature.

use std::error::Error;
use std::fs;
use std::path::Path;

use append::rolling_file::policy::compound::roll::Roll;
#[cfg(feature = "file")]
use file::{Deserialize, Deserializers};

/// Configuration for the delete roller.
#[cfg(feature = "file")]
#[derive(Deserialize)]
#[serde(deny_unknown_fields)]
pub struct DeleteRollerConfig {
    #[serde(skip_deserializing)] _p: (),
}

/// A roller which deletes the log file.
#[derive(Debug)]
pub struct DeleteRoller(());

impl Roll for DeleteRoller {
    fn roll(&self, file: &Path) -> Result<(), Box<Error + Sync + Send>> {
        fs::remove_file(file).map_err(Into::into)
    }
}

impl DeleteRoller {
    /// Returns a new `DeleteRoller`.
    pub fn new() -> DeleteRoller {
        DeleteRoller(())
    }
}

/// A deserializer for the `DeleteRoller`.
///
/// # Configuration
///
/// ```yaml
/// kind: delete
/// ```
#[cfg(feature = "file")]
pub struct DeleteRollerDeserializer;

#[cfg(feature = "file")]
impl Deserialize for DeleteRollerDeserializer {
    type Trait = Roll;

    type Config = DeleteRollerConfig;

    fn deserialize(
        &self,
        _: DeleteRollerConfig,
        _: &Deserializers,
    ) -> Result<Box<Roll>, Box<Error + Sync + Send>> {
        Ok(Box::new(DeleteRoller::new()))
    }
}