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//! API specific documentation.

mod account;
mod action;
mod certificate;
mod custom_image;
mod domain;
mod domain_record;
mod droplet;
mod droplet_action;
mod floating_ip;
mod floating_ip_action;
mod image;
mod image_action;
mod load_balancer;
mod region;
mod size;
mod snapshot;
mod ssh_key;
mod tag;
mod volume;
mod volume_action;

use serde::de::DeserializeOwned;
use url::Url;
use url_serde;

pub use self::account::Account;
pub use self::action::Action;
pub use self::certificate::Certificate;
pub use self::custom_image::CustomImage;
pub use self::domain::Domain;
pub use self::domain_record::DomainRecord;
pub use self::droplet::{droplet_fields, Droplet};
pub use self::floating_ip::FloatingIp;
pub use self::image::Image;
pub use self::load_balancer::{load_balancer_fields, LoadBalancer};
pub use self::region::Region;
pub use self::size::Size;
pub use self::snapshot::Snapshot;
pub use self::ssh_key::SshKey;
pub use self::tag::Tag;
pub use self::volume::Volume;

// Defined in https://developers.digitalocean.com/documentation/v2/#links
pub const MAX_PER_PAGE: usize = 200;

#[derive(Deserialize, Serialize, Debug, Clone)]
struct ApiLinks {
	pages: Option<ApiPages>
}

impl ApiLinks {
	fn next(&self) -> Option<Url> {
		match self.pages {
			Some(ref pages) => match pages.next {
				Some(ref v) => Some(v.clone()),
				None => None
			},
			None => None
		}
	}
}

#[derive(Deserialize, Serialize, Debug, Clone)]
struct ApiPages {
	#[serde(with = "url_serde", default)]
	prev: Option<Url>,

	#[serde(with = "url_serde", default)]
	first: Option<Url>,

	#[serde(with = "url_serde", default)]
	next: Option<Url>,

	#[serde(with = "url_serde", default)]
	last: Option<Url>
}

#[derive(Deserialize, Serialize, Debug, Clone)]
struct ApiMeta {
	total: usize
}

pub trait HasPagination {
	fn next_page(&self) -> Option<Url>;
}

pub trait HasValue {
	type Value: DeserializeOwned;
	fn value(self) -> Self::Value;
}

impl HasValue for () {
	type Value = ();

	fn value(self) -> Self::Value {}
}

pub trait HasResponse: DeserializeOwned + Clone {
	type Response: DeserializeOwned + Clone + HasValue<Value=Self>;
}

impl HasResponse for () {
	type Response = ();
}