use k8s_openapi::apimachinery::pkg::apis::meta::v1 as metav1;

use crate::BackendObjectReference;

/// ParentReference identifies an API object (usually a Gateway) that can be considered
/// a parent of this resource (usually a route). The only kind of parent resource
/// with "Core" support is Gateway. This API may be extended in the future to
/// support additional kinds of parent resources, such as HTTPRoute.
///
/// The API object must be valid in the cluster; the Group and Kind must
/// be registered in the cluster for this reference to be valid.
#[derive(
    Clone, Debug, Eq, PartialEq, serde::Deserialize, serde::Serialize, schemars::JsonSchema,
)]
#[serde(rename_all = "camelCase")]
pub struct ParentReference {
    /// Group is the group of the referent.
    ///
    /// Support: Core
    pub group: Option<Group>,

    /// Kind is kind of the referent.
    ///
    /// Support: Core (Gateway)
    /// Support: Custom (Other Resources)
    pub kind: Option<Kind>,

    /// Namespace is the namespace of the referent. When unspecified (or empty
    /// string), this refers to the local namespace of the Route.
    ///
    /// Support: Core
    pub namespace: Option<Namespace>,

    /// Name is the name of the referent.
    ///
    /// Support: Core
    pub name: ObjectName,

    /// SectionName is the name of a section within the target resource. In the
    /// following resources, SectionName is interpreted as the following:
    ///
    /// * Gateway: Listener Name. When both Port (experimental) and SectionName
    /// are specified, the name and port of the selected listener must match
    /// both specified values.
    ///
    /// Implementations MAY choose to support attaching Routes to other
    /// resources.  If that is the case, they MUST clearly document how
    /// SectionName is interpreted.
    ///
    /// When unspecified (empty string), this will reference the entire
    /// resource.  For the purpose of status, an attachment is considered
    /// successful if at least one section in the parent resource accepts it.
    /// For example, Gateway listeners can restrict which Routes can attach to
    /// them by Route kind, namespace, or hostname. If 1 of 2 Gateway listeners
    /// accept attachment from the referencing Route, the Route MUST be
    /// considered successfully attached. If no Gateway listeners accept
    /// attachment from this Route, the Route MUST be considered detached from
    /// the Gateway.
    ///
    /// Support: Core
    pub section_name: Option<SectionName>,

    /// Port is the network port this Route targets. It can be interpreted
    /// differently based on the type of parent resource:
    ///
    /// * Gateway: All listeners listening on the specified port that also
    /// support this kind of Route(and select this Route). It's not recommended
    /// to set `Port` unless the networking behaviors specified in a Route must
    /// apply to a specific port as opposed to a listener(s) whose port(s) may
    /// be changed. When both Port and SectionName are specified, the name and
    /// port of the selected listener must match both specified values.
    ///
    /// Implementations MAY choose to support other parent resources.
    /// Implementations supporting other types of parent resources MUST clearly
    /// document how/if Port is interpreted.
    ///
    /// For the purpose of status, an attachment is considered successful as
    /// long as the parent resource accepts it partially. For example, Gateway
    /// listeners can restrict which Routes can attach to them by Route kind,
    /// namespace, or hostname. If 1 of 2 Gateway listeners accept attachment
    /// from the referencing Route, the Route MUST be considered successfully
    /// attached. If no Gateway listeners accept attachment from this Route, the
    /// Route MUST be considered detached from the Gateway.
    ///
    /// Support: Extended
    pub port: Option<PortNumber>,
}

/// CommonRouteSpec defines the common attributes that all Routes MUST include
/// within their spec.
#[derive(
    Clone, Debug, Default, Eq, PartialEq, serde::Deserialize, serde::Serialize, schemars::JsonSchema,
)]
#[serde(rename_all = "camelCase")]
pub struct CommonRouteSpec {
    /// ParentRefs references the resources (usually Gateways) that a Route
    /// wants to be attached to. Note that the referenced parent resource needs
    /// to allow this for the attachment to be complete. For Gateways, that
    /// means the Gateway needs to allow attachment from Routes of this kind and
    /// namespace.
    ///
    /// The only kind of parent resource with "Core" support is Gateway. This
    /// API may be extended in the future to support additional kinds of parent
    /// resources such as one of the route kinds.
    ///
    /// It is invalid to reference an identical parent more than once. It is
    /// valid to reference multiple distinct sections within the same parent
    /// resource, such as 2 Listeners within a Gateway.
    ///
    /// It is possible to separately reference multiple distinct objects that
    /// may be collapsed by an implementation. For example, some implementations
    /// may choose to merge compatible Gateway Listeners together. If that is
    /// the case, the list of routes attached to those resources should also be
    /// merged.
    pub parent_refs: Option<Vec<ParentReference>>,
}

/// PortNumber defines a network port.
pub type PortNumber = u16;

/// BackendRef defines how a Route should forward a request to a Kubernetes
/// resource.
///
/// Note that when a namespace is specified, a ReferencePolicy object is
/// required in the referent namespace to allow that namespace's owner to accept
/// the reference. See the ReferencePolicy documentation for details.
#[derive(
    Clone, Debug, Eq, PartialEq, serde::Deserialize, serde::Serialize, schemars::JsonSchema,
)]
pub struct BackendRef {
    /// Weight specifies the proportion of requests forwarded to the referenced
    /// backend. This is computed as weight/(sum of all weights in this
    /// BackendRefs list). For non-zero values, there may be some epsilon from
    /// the exact proportion defined here depending on the precision an
    /// implementation supports. Weight is not a percentage and the sum of
    /// weights does not need to equal 100.
    ///
    /// If only one backend is specified and it has a weight greater than 0,
    /// 100% of the traffic is forwarded to that backend. If weight is set to 0,
    /// no traffic should be forwarded for this entry. If unspecified, weight
    /// defaults to 1.
    ///
    /// Support for this field varies based on the context where used.
    pub weight: Option<u16>,

    /// BackendObjectReference references a Kubernetes object.
    #[serde(flatten)]
    pub inner: BackendObjectReference,
}

/// RouteConditionType is a type of condition for a route.
pub type RouteConditionType = String;

/// RouteConditionReason is a reason for a route condition.
pub type RouteConditionReason = String;

/// RouteParentStatus describes the status of a route with respect to an
/// associated Parent.
#[derive(Clone, Debug, PartialEq, serde::Deserialize, serde::Serialize, schemars::JsonSchema)]
#[serde(rename_all = "camelCase")]
pub struct RouteParentStatus {
    /// ParentRef corresponds with a ParentRef in the spec that this
    /// RouteParentStatus struct describes the status of.
    pub parent_ref: ParentReference,

    /// ControllerName is a domain/path string that indicates the name of the
    /// controller that wrote this status. This corresponds with the
    /// controllerName field on GatewayClass.
    ///
    /// Example: "example.net/gateway-controller".
    ///
    /// The format of this field is DOMAIN "/" PATH, where DOMAIN and PATH are
    /// valid Kubernetes [names][names].
    ///
    /// Controllers MUST populate this field when writing status. Controllers should ensure that
    /// entries to status populated with their ControllerName are cleaned up when they are no
    /// longer necessary.
    ///
    /// [names]: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names
    pub controller_name: GatewayController,

    /// Conditions describes the status of the route with respect to the
    /// Gateway. Note that the route's availability is also subject to the
    /// Gateway's own status conditions and listener status.
    ///
    /// If the Route's ParentRef specifies an existing Gateway that supports
    /// Routes of this kind AND that Gateway's controller has sufficient access,
    /// then that Gateway's controller MUST set the "Accepted" condition on the
    /// Route, to indicate whether the route has been accepted or rejected by
    /// the Gateway, and why.
    ///
    /// A Route MUST be considered "Accepted" if at least one of the Route's
    /// rules is implemented by the Gateway.
    ///
    /// There are a number of cases where the "Accepted" condition may not be
    /// set due to lack of controller visibility, that includes when:
    ///
    /// * The Route refers to a non-existent parent.
    /// * The Route is of a type that the controller does not support.
    /// * The Route is in a namespace the the controller does not have access to.
    pub conditions: Vec<metav1::Condition>,
}

/// RouteStatus defines the common attributes that all Routes MUST include
/// within their status.
#[derive(Clone, Debug, PartialEq, serde::Deserialize, serde::Serialize, schemars::JsonSchema)]
pub struct RouteStatus {
    /// Parents is a list of parent resources (usually Gateways) that are
    /// associated with the route, and the status of the route with respect to
    /// each parent. When this route attaches to a parent, the controller that
    /// manages the parent must add an entry to this list when the controller
    /// first sees the route and should update the entry as appropriate when the
    /// route or gateway is modified.
    ///
    /// Note that parent references that cannot be resolved by an implementation
    /// of this API will not be added to this list. Implementations of this API
    /// can only populate Route status for the Gateways/parent resources they
    /// are responsible for.
    ///
    /// A maximum of 32 Gateways will be represented in this list. An empty list
    /// means the route has not been attached to any Gateway.
    pub parents: Vec<RouteParentStatus>,
}

/// Hostname is the fully qualified domain name of a network host. This matches
/// the RFC 1123 definition of a hostname with 2 notable exceptions:
///
/// 1. IPs are not allowed.
/// 2. A hostname may be prefixed with a wildcard label (`*.`). The wildcard
///    label must appear by itself as the first label.
///
/// Hostname can be "precise" which is a domain name without the terminating dot
/// of a network host (e.g. "foo.example.com") or "wildcard", which is a domain
/// name prefixed with a single wildcard label (e.g. `*.example.com`).
///
/// Note that as per RFC1035 and RFC1123, a *label* must consist of lower case
/// alphanumeric characters or '-', and must start and end with an alphanumeric
/// character. No other punctuation is allowed.
pub type Hostname = String;

/// PreciseHostname is the fully qualified domain name of a network host. This
/// matches the RFC 1123 definition of a hostname with 1 notable exception that
/// numeric IP addresses are not allowed.
///
/// Note that as per RFC1035 and RFC1123, a *label* must consist of lower case
/// alphanumeric characters or '-', and must start and end with an alphanumeric
/// character. No other punctuation is allowed.
pub type PreciseHostname = String;

/// Group refers to a Kubernetes Group. It must either be an empty string or a
/// RFC 1123 subdomain.
///
/// This validation is based off of the corresponding Kubernetes validation:
/// <https://github.com/kubernetes/apimachinery/blob/02cfb53916346d085a6c6c7c66f882e3c6b0eca6/pkg/util/validation/validation.go#L208>
///
/// Valid values include:
///
/// * "" - empty string implies core Kubernetes API group
/// * "networking.k8s.io"
/// * "foo.example.com"
///
/// Invalid values include:
///
/// * "example.com/bar" - "/" is an invalid character
pub type Group = String;

/// Kind refers to a Kubernetes Kind.
///
/// Valid values include:
///
/// * "Service"
/// * "HTTPRoute"
///
/// Invalid values include:
///
/// * "invalid/kind" - "/" is an invalid character
pub type Kind = String;

/// ObjectName refers to the name of a Kubernetes object.
///
/// Object names can have a variety of forms, including RFC1123 subdomains, RFC
/// 1123 labels, or RFC 1035 labels.
pub type ObjectName = String;

/// Namespace refers to a Kubernetes namespace. It must be a RFC 1123 label.
///
/// This validation is based off of the corresponding Kubernetes validation:
/// <https://github.com/kubernetes/apimachinery/blob/02cfb53916346d085a6c6c7c66f882e3c6b0eca6/pkg/util/validation/validation.go#L187>
///
/// This is used for Namespace name validation here:
/// <https://github.com/kubernetes/apimachinery/blob/02cfb53916346d085a6c6c7c66f882e3c6b0eca6/pkg/api/validation/generic.go#L63>
///
/// Valid values include:
///
/// * "example"
///
/// Invalid values include:
///
/// * "example.com" - "." is an invalid character
pub type Namespace = String;

/// SectionName is the name of a section in a Kubernetes resource.
///
/// This validation is based off of the corresponding Kubernetes validation:
/// <https://github.com/kubernetes/apimachinery/blob/02cfb53916346d085a6c6c7c66f882e3c6b0eca6/pkg/util/validation/validation.go#L208>
///
/// Valid values include:
///
/// * "example.com"
/// * "foo.example.com"
///
/// Invalid values include:
///
/// * "example.com/bar" - "/" is an invalid character
pub type SectionName = String;

/// GatewayController is the name of a Gateway API controller. It must be a
/// domain prefixed path.
///
/// Valid values include:
///
/// * "example.com/bar"
///
/// Invalid values include:
///
/// * "example.com" - must include path
/// * "foo.example.com" - must include path
pub type GatewayController = String;

/// AnnotationKey is the key of an annotation in Gateway API. This is used for
/// validation of maps such as TLS options. This matches the Kubernetes
/// "qualified name" validation that is used for annotations and other common
/// values.
///
/// Valid values include:
///
/// * example
/// * example.com
/// * example.com/path
/// * example.com/path.html
///
/// Invalid values include:
///
/// * example~ - "~" is an invalid character
/// * example.com. - can not start or end with "."
pub type AnnotationKey = String;

/// AnnotationValue is the value of an annotation in Gateway API. This is used
/// for validation of maps such as TLS options. This roughly matches Kubernetes
/// annotation validation, although the length validation in that case is based
/// on the entire size of the annotations struct.
pub type AnnotationValue = String;

/// AddressType defines how a network address is represented as a text string.
pub type AddressType = String;