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use crate::Configuration;
use std::ops::Deref;

/// Defines the behavior for a section of application configuration values.
pub trait ConfigurationSection: Configuration + Deref<Target = dyn Configuration> {
    /// Gets the key this section occupies in its parent.
    fn key(&self) -> &str;

    /// Gets the full path to this section within the [configuration](trait.Configuration.html).
    fn path(&self) -> &str;

    /// Gets the section value.
    fn value(&self) -> &str;
}

pub mod ext {

    use super::*;

    /// Defines extension methods for the [ConfigurationSection](trait.ConfigurationSection.html) trait.
    pub trait ConfigurationSectionExtensions {
        /// Gets a value indicating whether the configuration section exists.
        ///
        /// # Remarks
        ///
        /// A configuration section is considered nonexistent if it has no
        /// value and no children
        fn exists(&self) -> bool;
    }

    impl ConfigurationSectionExtensions for dyn ConfigurationSection {
        fn exists(&self) -> bool {
            !self.value().is_empty() || !self.children().is_empty()
        }
    }

    impl<T: ConfigurationSection> ConfigurationSectionExtensions for T {
        fn exists(&self) -> bool {
            !self.value().is_empty() || !self.children().is_empty()
        }
    }
}