package tenants

import (

	"github.com/gophercloud/gophercloud"

	"github.com/gophercloud/gophercloud/pagination"

)

// Tenant is a grouping of users in the identity service.

type Tenant struct {

	// ID is a unique identifier for this tenant.

	ID string `json:"id"`

	// Name is a friendlier user-facing name for this tenant.

	Name string `json:"name"`

	// Description is a human-readable explanation of this Tenant's purpose.

	Description string `json:"description"`

	// Enabled indicates whether or not a tenant is active.

	Enabled bool `json:"enabled"`

}

// TenantPage is a single page of Tenant results.

type TenantPage struct {

	pagination.LinkedPageBase

}

// IsEmpty determines whether or not a page of Tenants contains any results.

func (r TenantPage) IsEmpty() (bool, error) {

	tenants, err := ExtractTenants(r)

	return len(tenants) == 0, err

}

// NextPageURL extracts the "next" link from the tenants_links section of the result.

func (r TenantPage) NextPageURL() (string, error) {

	var s struct {

		Links []gophercloud.Link `json:"tenants_links"`

	}

	err := r.ExtractInto(&s)

	if err != nil {

		return "", err

	}

	return gophercloud.ExtractNextURL(s.Links)

}

// ExtractTenants returns a slice of Tenants contained in a single page of

// results.

func ExtractTenants(r pagination.Page) ([]Tenant, error) {

	var s struct {

		Tenants []Tenant `json:"tenants"`

	}

	err := (r.(TenantPage)).ExtractInto(&s)

	return s.Tenants, err

}

type tenantResult struct {

	gophercloud.Result

}

// Extract interprets any tenantResults as a Tenant.

func (r tenantResult) Extract() (*Tenant, error) {

	var s struct {

		Tenant *Tenant `json:"tenant"`

	}

	err := r.ExtractInto(&s)

	return s.Tenant, err

}

// GetResult is the response from a Get request. Call its Extract method to

// interpret it as a Tenant.

type GetResult struct {

	tenantResult

}

// CreateResult is the response from a Create request. Call its Extract method

// to interpret it as a Tenant.

type CreateResult struct {

	tenantResult

}

// DeleteResult is the response from a Get request. Call its ExtractErr method

// to determine if the call succeeded or failed.

type DeleteResult struct {

	gophercloud.ErrResult

}

// UpdateResult is the response from a Update request. Call its Extract method

// to interpret it as a Tenant.

type UpdateResult struct {

	tenantResult

}