package gophercloud

/*
AuthOptions stores information needed to authenticate to an OpenStack cluster.
You can populate one manually, or use a provider's AuthOptionsFromEnv() function
to read relevant information from the standard environment variables. Pass one
to a provider's AuthenticatedClient function to authenticate and obtain a
ProviderClient representing an active session on that provider.

Its fields are the union of those recognized by each identity implementation and
provider.
*/
type AuthOptions struct {
	// IdentityEndpoint specifies the HTTP endpoint that is required to work with
	// the Identity API of the appropriate version. While it's ultimately needed by
	// all of the identity services, it will often be populated by a provider-level
	// function.
	IdentityEndpoint string `json:"-"`

	// Username is required if using Identity V2 API. Consult with your provider's
	// control panel to discover your account's username. In Identity V3, either
	// UserID or a combination of Username and DomainID or DomainName are needed.
	Username string `json:"username,omitempty"`
	UserID   string `json:"id,omitempty"`

	Password string `json:"password,omitempty"`

	// At most one of DomainID and DomainName must be provided if using Username
	// with Identity V3. Otherwise, either are optional.
	DomainID   string `json:"id,omitempty"`
	DomainName string `json:"name,omitempty"`

	// The TenantID and TenantName fields are optional for the Identity V2 API.
	// Some providers allow you to specify a TenantName instead of the TenantId.
	// Some require both. Your provider's authentication policies will determine
	// how these fields influence authentication.
	TenantID   string `json:"tenantId,omitempty"`
	TenantName string `json:"tenantName,omitempty"`

	// AllowReauth should be set to true if you grant permission for Gophercloud to
	// cache your credentials in memory, and to allow Gophercloud to attempt to
	// re-authenticate automatically if/when your token expires.  If you set it to
	// false, it will not cache these settings, but re-authentication will not be
	// possible.  This setting defaults to false.
	//
	// NOTE: The reauth function will try to re-authenticate endlessly if left unchecked.
	// The way to limit the number of attempts is to provide a custom HTTP client to the provider client
	// and provide a transport that implements the RoundTripper interface and stores the number of failed retries.
	// For an example of this, see here: https://github.com/rackspace/rack/blob/1.0.0/auth/clients.go#L311
	AllowReauth bool

	// TokenID allows users to authenticate (possibly as another user) with an
	// authentication token ID.
	TokenID string
}

// ToTokenV2CreateMap allows AuthOptions to satisfy the AuthOptionsBuilder
// interface in the v2 tokens package
func (opts AuthOptions) ToTokenV2CreateMap() (map[string]interface{}, error) {
	// Populate the request map.
	authMap := make(map[string]interface{})

	if opts.Username != "" {
		if opts.Password != "" {
			authMap["passwordCredentials"] = map[string]interface{}{
				"username": opts.Username,
				"password": opts.Password,
			}
		} else {
			return nil, ErrMissingInput{Argument: "Password"}
		}
	} else if opts.TokenID != "" {
		authMap["token"] = map[string]interface{}{
			"id": opts.TokenID,
		}
	} else {
		return nil, ErrMissingInput{Argument: "Username"}
	}

	if opts.TenantID != "" {
		authMap["tenantId"] = opts.TenantID
	}
	if opts.TenantName != "" {
		authMap["tenantName"] = opts.TenantName
	}

	return map[string]interface{}{"auth": authMap}, nil
}