// ToObjectGetQuery formats a GetOpts into a query string.
func (opts GetOpts) ToObjectGetQuery() (string, error) {
	q, err := gophercloud.BuildQueryString(opts)
	if err != nil {
		return "", err
	}
	return q.String(), nil
}

// ToResourceEventListQuery formats a ListResourceEventsOpts into a query string.
func (opts ListResourceEventsOpts) ToResourceEventListQuery() (string, error) {
	q, err := gophercloud.BuildQueryString(opts)
	if err != nil {
		return "", err
	}
	return q.String(), nil
}

// ToMeterStatisticsQuery formats a StatisticsOpts into a query string.
func (opts MeterStatisticsOpts) ToMeterStatisticsQuery() (string, error) {
	q, err := gophercloud.BuildQueryString(opts)
	if err != nil {
		return "", err
	}
	return q.String(), nil
}

// ToPortListQuery formats a ListOpts into a query string.
func (opts ListOpts) ToPortListQuery() (string, error) {
	q, err := gophercloud.BuildQueryString(opts)
	if err != nil {
		return "", err
	}
	return q.String(), nil
}

// ToContainerListParams formats a ListOpts into a query string and boolean
// representing whether to list complete information for each container.
func (opts ListOpts) ToContainerListParams() (bool, string, error) {
	q, err := gophercloud.BuildQueryString(opts)
	if err != nil {
		return false, "", err
	}
	return false, q.String(), nil
}

// ToRolesListAssignmentsQuery formats a ListAssignmentsOpts into a query string.
func (opts ListAssignmentsOpts) ToRolesListAssignmentsQuery() (string, error) {
	q, err := gophercloud.BuildQueryString(opts)
	if err != nil {
		return "", err
	}
	return q.String(), nil
}

// ToMeterShowQuery formats a ShowOpts into a query string.
func (opts ShowOpts) ToShowQuery() (string, error) {
	q, err := gophercloud.BuildQueryString(opts)
	if err != nil {
		return "", err
	}
	return q.String(), nil
}

// ToObjectListParams formats a ListOpts into a query string and boolean
// representing whether to list complete information for each object.
func (opts ListOpts) ToObjectListParams() (bool, string, error) {
	q, err := gophercloud.BuildQueryString(opts)
	if err != nil {
		return false, "", err
	}
	return opts.Full, q.String(), nil
}

// ToCDNAssetDeleteParams formats a DeleteOpts into a query string.
func (opts DeleteOpts) ToCDNAssetDeleteParams() (string, error) {
	q, err := gophercloud.BuildQueryString(opts)
	if err != nil {
		return "", err
	}
	return q.String(), nil
}

// GetDataByPoints retrieve metric data by resolution, for the specified tenant associated with RackspaceMetrics.
func GetDataByResolution(c *gophercloud.ServiceClient, metric string, opts QueryParams) GetResult {
	var res GetResult

	url := getURLForResolution(c, metric)
	query, _ := gophercloud.BuildQueryString(opts)
	url += query.String()
	_, res.Err = c.Get(url, &res.Body, nil)
	return res
}

// List returns a Pager which allows you to iterate over a collection of
// routers. It accepts a ListOpts struct, which allows you to filter and sort
// the returned collection for greater efficiency.
//
// Default policy settings return only those routers that are owned by the
// tenant who submits the request, unless an admin user submits the request.
func List(c *gophercloud.ServiceClient, opts ListOpts) pagination.Pager {
	q, err := gophercloud.BuildQueryString(&opts)
	if err != nil {
		return pagination.Pager{Err: err}
	}
	u := rootURL(c) + q.String()
	return pagination.NewPager(c, u, func(r pagination.PageResult) pagination.Page {
		return RouterPage{pagination.LinkedPageBase{PageResult: r}}
	})
}

// ToObjectDownloadParams formats a DownloadOpts into a query string and map of
// headers.
func (opts DownloadOpts) ToObjectDownloadParams() (map[string]string, string, error) {
	q, err := gophercloud.BuildQueryString(opts)
	if err != nil {
		return nil, "", err
	}
	h, err := gophercloud.BuildHeaders(opts)
	if err != nil {
		return nil, q.String(), err
	}
	return h, q.String(), nil
}

// List enumerates the services available to a specific user.
func List(client *gophercloud.ServiceClient, opts ListOpts) pagination.Pager {
	u := listURL(client)
	q, err := gophercloud.BuildQueryString(opts)
	if err != nil {
		return pagination.Pager{Err: err}
	}
	u += q.String()
	createPage := func(r pagination.PageResult) pagination.Page {
		return ServicePage{pagination.LinkedPageBase{PageResult: r}}
	}

	return pagination.NewPager(client, u, createPage)
}

// SearchMetric retrieves a list of available metrics for the specified tenant associated with RackspaceMetrics.
func SearchMetric(c *gophercloud.ServiceClient, opts QueryParams) ([]Metric, error) {
	var res GetResult

	url := getSearchURL(c)
	query, _ := gophercloud.BuildQueryString(opts)
	url += query.String()

	_, res.Err = c.Get(url, &res.Body, nil)
	b := res.Body.(interface{})
	var metrics []Metric
	err := mapstructure.Decode(b, &metrics)
	return metrics, err
}

//GetEvents retrieves a list of events for the specified tenant associated with RackspaceMetrics.
func GetEvents(c *gophercloud.ServiceClient, opts QueryParams) ([]Event, error) {
	var res GetResult

	url := getEventURL(c)
	query, _ := gophercloud.BuildQueryString(opts)
	url += query.String()

	_, res.Err = c.Get(url, &res.Body, nil)
	b := res.Body.(interface{})
	var events []Event
	err := mapstructure.Decode(b, &events)
	return events, err
}

// ToObjectCreateParams formats a CreateOpts into a query string and map of
// headers.
func (opts CreateOpts) ToObjectCreateParams() (map[string]string, string, error) {
	q, err := gophercloud.BuildQueryString(opts)
	if err != nil {
		return nil, "", err
	}
	h, err := gophercloud.BuildHeaders(opts)
	if err != nil {
		return nil, q.String(), err
	}

	for k, v := range opts.Metadata {
		h["X-Object-Meta-"+k] = v
	}

	return h, q.String(), nil
}

// List enumerates the Tenants to which the current token has access.
func List(client *gophercloud.ServiceClient, opts *ListOpts) pagination.Pager {
	createPage := func(r pagination.PageResult) pagination.Page {
		return TenantPage{pagination.LinkedPageBase{PageResult: r}}
	}

	url := listURL(client)
	if opts != nil {
		q, err := gophercloud.BuildQueryString(opts)
		if err != nil {
			return pagination.Pager{Err: err}
		}
		url += q.String()
	}

	return pagination.NewPager(client, url, createPage)
}

// GetDataForListByResolution retrieve data against a list of metrics and specified resolution, for the specified tenant associated with RackspaceMetrics.
func GetDataForListByResolution(c *gophercloud.ServiceClient, opts QueryParams, metrics ...string) (MetricListData, error) {
	var res GetResult

	reqBody := make([]interface{}, len(metrics))
	for i, v := range metrics {
		reqBody[i] = v
	}
	url := getURLForListAndResolution(c)
	query, _ := gophercloud.BuildQueryString(opts)
	url += query.String()
	_, res.Err = c.Post(url, reqBody, &res.Body, &gophercloud.RequestOpts{
		OkCodes: []int{200},
	})
	b := res.Body.(interface{})
	var metricList MetricListData
	err := mapstructure.Decode(b, &metricList)
	return metricList, err
}