package api

import (
	"fmt"
	"time"
)

// Namespace is the configuration of a single namespace. Namespacing is a Consul Enterprise feature.
type Namespace struct {
	// Name is the name of the Namespace. It must be unique and
	// must be a DNS hostname. There are also other reserved names
	// that may not be used.
	Name string `json:"Name"`

	// Description is where the user puts any information they want
	// about the namespace. It is not used internally.
	Description string `json:"Description,omitempty"`

	// ACLs is the configuration of ACLs for this namespace. It has its
	// own struct so that we can add more to it in the future.
	// This is nullable so that we can omit if empty when encoding in JSON
	ACLs *NamespaceACLConfig `json:"ACLs,omitempty"`

	// DeletedAt is the time when the Namespace was marked for deletion
	// This is nullable so that we can omit if empty when encoding in JSON
	DeletedAt *time.Time `json:"DeletedAt,omitempty"`

	// CreateIndex is the Raft index at which the Namespace was created
	CreateIndex uint64 `json:"CreateIndex,omitempty"`

	// ModifyIndex is the latest Raft index at which the Namespace was modified.
	ModifyIndex uint64 `json:"ModifyIndex,omitempty"`
}

// NamespaceACLConfig is the Namespace specific ACL configuration container
type NamespaceACLConfig struct {
	// PolicyDefaults is the list of policies that should be used for the parent authorizer
	// of all tokens in the associated namespace.
	PolicyDefaults []ACLLink `json:"PolicyDefaults"`
	// RoleDefaults is the list of roles that should be used for the parent authorizer
	// of all tokens in the associated namespace.
	RoleDefaults []ACLLink `json:"RoleDefaults"`
}

// Namespaces can be used to manage Namespaces in Consul Enterprise..
type Namespaces struct {
	c *Client
}

// Operator returns a handle to the operator endpoints.
func (c *Client) Namespaces() *Namespaces {
	return &Namespaces{c}
}

func (n *Namespaces) Create(ns *Namespace, q *WriteOptions) (*Namespace, *WriteMeta, error) {
	if ns.Name == "" {
		return nil, nil, fmt.Errorf("Must specify a Name for Namespace creation")
	}

	r := n.c.newRequest("PUT", "/v1/namespace")
	r.setWriteOptions(q)
	r.obj = ns
	rtt, resp, err := requireOK(n.c.doRequest(r))
	if err != nil {
		return nil, nil, err
	}
	defer resp.Body.Close()

	wm := &WriteMeta{RequestTime: rtt}
	var out Namespace
	if err := decodeBody(resp, &out); err != nil {
		return nil, nil, err
	}

	return &out, wm, nil
}

func (n *Namespaces) Update(ns *Namespace, q *WriteOptions) (*Namespace, *WriteMeta, error) {
	if ns.Name == "" {
		return nil, nil, fmt.Errorf("Must specify a Name for Namespace updating")
	}

	r := n.c.newRequest("PUT", "/v1/namespace/"+ns.Name)
	r.setWriteOptions(q)
	r.obj = ns
	rtt, resp, err := requireOK(n.c.doRequest(r))
	if err != nil {
		return nil, nil, err
	}
	defer resp.Body.Close()

	wm := &WriteMeta{RequestTime: rtt}
	var out Namespace
	if err := decodeBody(resp, &out); err != nil {
		return nil, nil, err
	}

	return &out, wm, nil
}

func (n *Namespaces) Read(name string, q *QueryOptions) (*Namespace, *QueryMeta, error) {
	var out Namespace
	qm, err := n.c.query("/v1/namespace/"+name, &out, q)
	if err != nil {
		return nil, nil, err
	}
	return &out, qm, nil
}

func (n *Namespaces) Delete(name string, q *WriteOptions) (*WriteMeta, error) {
	r := n.c.newRequest("DELETE", "/v1/namespace/"+name)
	r.setWriteOptions(q)
	rtt, resp, err := requireOK(n.c.doRequest(r))
	if err != nil {
		return nil, err
	}
	resp.Body.Close()

	wm := &WriteMeta{RequestTime: rtt}
	return wm, nil
}

func (n *Namespaces) List(q *QueryOptions) ([]*Namespace, *QueryMeta, error) {
	var out []*Namespace
	qm, err := n.c.query("/v1/namespaces", &out, q)
	if err != nil {
		return nil, nil, err
	}

	return out, qm, nil
}