type Collector interface {
	// Collect metrics from this collector.
	// Returns the next time this collector should be collected from.
	// Next collection time is always returned, even when an error occurs.
	// A collection time of zero means no more collection.
	Collect(map[string][]v1.MetricVal) (time.Time, map[string][]v1.MetricVal, error)

	// Return spec for all metrics associated with this collector
	GetSpec() []v1.MetricSpec

	// Name of this collector.
	Name() string
}

type CollectorManager interface {
	// Register a collector.
	RegisterCollector(collector Collector) error

	// Collect from collectors that are ready and return the next time
	// at which a collector will be ready to collect from.
	// Next collection time is always returned, even when an error occurs.
	// A collection time of zero means no more collection.
	Collect() (time.Time, map[string][]v1.MetricVal, error)

	// Get metric spec from all registered collectors.
	GetSpec() ([]v1.MetricSpec, error)
}

type Config struct {
	//the endpoint to hit to scrape metrics
	Endpoint string `json:"endpoint"`

	//holds information about different metrics that can be collected
	MetricsConfig []MetricConfig `json:"metrics_config"`
}

type FakeCollectorManager struct {
}

type GenericCollector struct {
	// contains filtered or unexported fields
}

type GenericCollectorManager struct {
	Collectors         []*collectorData
	NextCollectionTime time.Time
}

type MetricConfig struct {
	//the name of the metric
	Name string `json:"name"`

	//enum type for the metric type
	MetricType v1.MetricType `json:"metric_type"`

	// metric units to display on UI and in storage (eg: MB, cores)
	// this is only used for display.
	Units string `json:"units"`

	//data type of the metric (eg: int, float)
	DataType v1.DataType `json:"data_type"`

	//the frequency at which the metric should be collected
	PollingFrequency time.Duration `json:"polling_frequency"`

	//the regular expression that can be used to extract the metric
	Regex string `json:"regex"`
}

type Prometheus struct {
	//the endpoint to hit to scrape metrics
	Endpoint string `json:"endpoint"`

	//the frequency at which metrics should be collected
	PollingFrequency time.Duration `json:"polling_frequency"`

	//holds names of different metrics that can be collected
	MetricsConfig []string `json:"metrics_config"`
}

type PrometheusCollector struct {
	// contains filtered or unexported fields
}