use actix_web::http::{header::DispositionType, Method};
use mime;

/// Describes `StaticFiles` configiration
///
/// To configure actix's static resources you need
/// to define own configiration type and implement any method
/// you wish to customize.
/// As trait implements reasonable defaults for Actix.
///
/// ## Example
///
/// ```rust
/// use actix_web::http::header::DispositionType;
/// use actix_files::{StaticFileConfig, NamedFile};
///
/// #[derive(Default)]
/// struct MyConfig;
///
/// impl StaticFileConfig for MyConfig {
///     fn content_disposition_map(typ: mime::Name) -> DispositionType {
///         DispositionType::Attachment
///     }
/// }
///
/// let file = NamedFile::open_with_config("foo.txt", MyConfig);
/// ```
pub trait StaticFileConfig: Default {
    /// Describes mapping for mime type to content disposition header
    ///
    /// By default `IMAGE`, `TEXT` and `VIDEO` are mapped to Inline.
    /// Others are mapped to Attachment
    fn content_disposition_map(typ: mime::Name) -> DispositionType {
        match typ {
            mime::IMAGE | mime::TEXT | mime::VIDEO => DispositionType::Inline,
            _ => DispositionType::Attachment,
        }
    }

    /// Describes whether Actix should attempt to calculate `ETag`
    ///
    /// Defaults to `true`
    fn is_use_etag() -> bool {
        true
    }

    /// Describes whether Actix should use last modified date of file.
    ///
    /// Defaults to `true`
    fn is_use_last_modifier() -> bool {
        true
    }

    /// Describes allowed methods to access static resources.
    ///
    /// By default all methods are allowed
    fn is_method_allowed(_method: &Method) -> bool {
        true
    }
}

/// Default content disposition as described in
/// [StaticFileConfig](trait.StaticFileConfig.html)
#[derive(Default)]
pub struct DefaultConfig;

impl StaticFileConfig for DefaultConfig {}