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//! # Feed options
//! Listings do not use page numbers because their content changes so frequently.
//! Instead, they allow you to view slices of the underlying data.
//! Listing JSON responses contain after and before fields which are equivalent to the
//! "next" and "prev" buttons on the site and in combination with count can be used to page
//! through the listing.

/// Basic feed options
pub struct FeedOption {
    /// `after` and `before` indicate the fullname of an item in the listing to use as the anchor point of the slice.
    pub after: Option<String>,
    /// Only one should be specified.
    pub before: Option<String>,
    /// The number of items already seen in this listing.
    pub count: Option<u32>,
}

impl FeedOption {
    /// Create a new `FeedOption` instance.
    pub fn new() -> FeedOption {
        FeedOption {
            after: None,
            before: None,
            count: None,
        }
    }

    /// Set after param.
    pub fn after(mut self, ty: &str) -> FeedOption {
        if !self.before.is_none() {
            panic!("Cannot have an after and before param at the same time");
        }

        self.after = Some(ty.to_owned());
        self
    }

    /// Set before param.
    pub fn before(mut self, ty: &str) -> FeedOption {
        if !self.after.is_none() {
            panic!("Cannot have an after and before param at the same time");
        }

        self.before = Some(ty.to_owned());
        self
    }

    /// Set count param.
    pub fn count(mut self, ty: u32) -> FeedOption {
        self.count = Some(ty);
        self
    }
}